[622] | 1 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 2 | // File : stdio.c |
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| 3 | // Written by Alain Greiner |
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| 4 | // Date : janvier 2014 |
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| 5 | // |
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[629] | 6 | // This file defines various functions that can be used by applications to access |
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[622] | 7 | // peripherals, for the TSAR multi-processors multi_clusters architecture. |
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| 8 | // There is NO separation between application code and system code, as the |
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| 9 | // application are running in kernel mode without system calls. |
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| 10 | // This basic GIET does not support virtual memory, and does not support multi-tasking. |
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| 11 | // |
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| 12 | // The supported peripherals are: |
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| 13 | // - the SoClib multi_tty |
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| 14 | // - The SoCLib frame_buffer |
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| 15 | // - The SoCLib block_device |
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| 16 | // |
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| 17 | // The following parameters must be defined in the hard_config.h file. |
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| 18 | // - X_SIZE : number of clusters in a row |
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| 19 | // - Y_SIZE : number of clusters in a column |
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| 20 | // - X_WIDTH : number of bits for X field in proc_id |
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| 21 | // - Y_WIDTH : number of bits for Y field in proc_id |
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| 22 | // - NB_PROCS_MAX : max number of processor per cluster |
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| 23 | // - NB_TTY_CHANNELS : max number of TTY channels |
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| 24 | // |
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| 25 | // The follobing base addresses must be defined in the ldscript |
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| 26 | // - seg_tty_base |
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| 27 | // - seg_fbf_base |
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| 28 | // - seg_ioc_base |
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| 29 | //////////////////////////////////////////////////////////////////////////////////////// |
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[158] | 30 | |
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[622] | 31 | #include "stdio.h" |
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[158] | 32 | |
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[629] | 33 | #if !defined(NB_PROCS_MAX) |
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| 34 | #error: you must define NB_PROCS_MAX in the hard_config.h file |
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| 35 | #endif |
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| 36 | |
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[743] | 37 | #if !defined(X_IO) || !defined(Y_IO) |
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| 38 | #error: you must define X_IO and Y_IO in the hard_config.h file |
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[629] | 39 | #endif |
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| 40 | |
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| 41 | #if !defined(X_SIZE) |
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| 42 | #error: you must define X_SIZE in the hard_config.h file |
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| 43 | #endif |
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| 44 | |
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| 45 | #if !defined(Y_SIZE) |
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| 46 | #error: you must define Y_SIZE in the hard_config.h file |
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| 47 | #endif |
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| 48 | |
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| 49 | #if !defined(X_WIDTH) |
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| 50 | #error: you must define X_WIDTH in the hard_config.h file |
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| 51 | #endif |
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| 52 | |
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| 53 | #if (X_WIDTH != 4) |
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| 54 | #error: The X_WIDTH parameter must be equal to 4 |
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| 55 | #endif |
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| 56 | |
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| 57 | #if !defined(Y_WIDTH) |
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| 58 | #error: you must define X_WIDTH in the hard_config.h file |
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| 59 | #endif |
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| 60 | |
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| 61 | #if (X_WIDTH != 4) |
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| 62 | #error: The Y_WIDTH parameter must be equal to 4 |
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| 63 | #endif |
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| 64 | |
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| 65 | #if !defined(NB_TTY_CHANNELS) |
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| 66 | #error: you must define NB_TTY_CHANNELS in the hard_config.h file |
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| 67 | #endif |
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| 68 | |
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[622] | 69 | #define NB_LOCKS 256 |
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| 70 | #define NB_BARRIERS 16 |
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[158] | 71 | |
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[622] | 72 | #define in_drivers __attribute__((section (".drivers"))) |
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| 73 | #define in_unckdata __attribute__((section (".unckdata"))) |
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[158] | 74 | |
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[622] | 75 | ////////////////////////////////////////////////////////////// |
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| 76 | // various informations that must be defined in ldscript |
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| 77 | ////////////////////////////////////////////////////////////// |
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[158] | 78 | |
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[622] | 79 | struct plouf; |
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[743] | 80 | extern volatile struct plouf seg_tty_base; |
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| 81 | extern volatile struct plouf seg_fbf_base; |
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| 82 | extern volatile struct plouf seg_ioc_base; |
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| 83 | extern volatile struct plouf seg_mmc_base; |
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| 84 | extern volatile struct plouf seg_ramdisk_base; |
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[622] | 85 | |
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| 86 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 87 | // Global uncachable variables for synchronization between drivers and ISRs |
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| 88 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 89 | |
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[743] | 90 | static in_unckdata int volatile _ioc_lock = 0; |
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| 91 | static in_unckdata int volatile _ioc_done = 0; |
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| 92 | static in_unckdata int volatile _ioc_status; |
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[622] | 93 | |
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[743] | 94 | static in_unckdata char volatile _tty_get_buf[NB_TTY_CHANNELS]; |
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| 95 | static in_unckdata int volatile _tty_get_full[NB_TTY_CHANNELS] = { [0 ... NB_TTY_CHANNELS-1] = 0 }; |
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[622] | 96 | |
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| 97 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 98 | // Global uncachable variables for inter-task barriers |
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| 99 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 100 | |
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[743] | 101 | static in_unckdata int volatile _barrier_value[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
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| 102 | static in_unckdata int volatile _barrier_count[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
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| 103 | static in_unckdata int volatile _barrier_lock[NB_BARRIERS] = { [0 ... NB_BARRIERS-1] = 0 }; |
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[622] | 104 | |
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| 105 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 106 | // Global uncachable variables for spin_locks using LL/C instructions |
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| 107 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 108 | |
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[743] | 109 | static in_unckdata int volatile _spin_lock[NB_LOCKS] = { [0 ... NB_LOCKS-1] = 0 }; |
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[622] | 110 | |
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| 111 | //////////////////////////////////////////////////////////////////////////////////////// |
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[629] | 112 | // Memcopy taken from MutekH. |
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[622] | 113 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 114 | in_drivers void* _memcpy( void* _dst, |
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| 115 | const void* _src, |
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| 116 | unsigned int size ) |
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[158] | 117 | { |
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[622] | 118 | unsigned int *dst = _dst; |
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| 119 | const unsigned int *src = _src; |
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| 120 | if ( ! ((unsigned int)dst & 3) && ! ((unsigned int)src & 3) ) |
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| 121 | { |
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| 122 | while (size > 3) |
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| 123 | { |
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| 124 | *dst++ = *src++; |
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| 125 | size -= 4; |
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| 126 | } |
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| 127 | } |
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[158] | 128 | |
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[622] | 129 | unsigned char *cdst = (unsigned char*)dst; |
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| 130 | unsigned char *csrc = (unsigned char*)src; |
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| 131 | |
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| 132 | while (size--) |
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| 133 | { |
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| 134 | *cdst++ = *csrc++; |
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| 135 | } |
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| 136 | return _dst; |
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[158] | 137 | } |
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[629] | 138 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 139 | // Memcopy using extended addresses |
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| 140 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 141 | in_drivers void _extended_memcpy( unsigned int dst_cluster, |
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| 142 | unsigned int dst_address, |
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| 143 | unsigned int src_cluster, |
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| 144 | unsigned int src_address, |
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| 145 | unsigned int length ) |
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| 146 | { |
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| 147 | if ( (dst_address & 0x3) || (src_address & 0x3) || (length & 0x3) ) |
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| 148 | { |
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| 149 | _tty_get_lock( 0 ); |
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| 150 | _tty_puts( "ERROR in _extended_memcpy()" ); |
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| 151 | _tty_release_lock( 0 ); |
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| 152 | _exit(); |
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| 153 | } |
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[158] | 154 | |
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[629] | 155 | unsigned int i; |
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| 156 | unsigned int word; |
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| 157 | |
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| 158 | for ( i = 0 ; i < length ; i = i+4 ) |
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| 159 | { |
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| 160 | word = _word_extended_read( src_cluster, (src_address + i) ); |
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| 161 | _word_extended_write( dst_cluster, (dst_address + i), word ); |
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| 162 | } |
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| 163 | } |
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[622] | 164 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 165 | // Access CP0 and returns processor ident |
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| 166 | // No more than 1024 processors... |
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| 167 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 168 | in_drivers unsigned int _procid() |
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[158] | 169 | { |
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[622] | 170 | unsigned int ret; |
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| 171 | asm volatile( "mfc0 %0, $15, 1": "=r"(ret) ); |
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| 172 | return (ret & 0x3FF); |
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[158] | 173 | } |
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[622] | 174 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 175 | // Access CP0 and returns processor time |
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| 176 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 177 | in_drivers unsigned int _proctime() |
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[158] | 178 | { |
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[622] | 179 | unsigned int ret; |
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| 180 | asm volatile( "mfc0 %0, $9": "=r"(ret) ); |
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| 181 | return ret; |
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[158] | 182 | } |
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[622] | 183 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 184 | // Returns the number of processsors controled by the GIET |
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| 185 | //////////////////////////////////////////////////////////////////////////////////////// |
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[743] | 186 | in_drivers inline unsigned int _procnumber() |
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[158] | 187 | { |
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[622] | 188 | return (unsigned int)(NB_PROCS_MAX * X_SIZE * Y_SIZE); |
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[158] | 189 | } |
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[622] | 190 | //////////////////////////////////////////////////////////////////////////////////////// |
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[626] | 191 | // Returns pseudo-random number |
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| 192 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 193 | in_drivers unsigned int _rand() |
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| 194 | { |
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| 195 | unsigned int x = _proctime(); |
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| 196 | if((x & 0xF) > 7) |
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| 197 | return (x*x & 0xFFFF); |
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| 198 | else |
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| 199 | return (x*x*x & 0xFFFF); |
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| 200 | } |
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| 201 | //////////////////////////////////////////////////////////////////////////////////////// |
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[743] | 202 | // Access CP0 and enable IRQs |
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| 203 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 204 | in_drivers inline void _it_enable() |
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| 205 | { |
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| 206 | asm volatile( |
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| 207 | "mfc0 $8, $12 \n" |
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| 208 | "ori $8, $8, 1 \n" |
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| 209 | "mtc0 $8, $12 \n" |
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| 210 | ::: "$8"); |
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| 211 | } |
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| 212 | //////////////////////////////////////////////////////////////////////////////////////// |
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[622] | 213 | // Access CP0 and mask IRQs |
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| 214 | //////////////////////////////////////////////////////////////////////////////////////// |
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[743] | 215 | in_drivers inline void _it_disable() |
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[158] | 216 | { |
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[743] | 217 | asm volatile( |
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| 218 | "li $9, 0xFFFFFFFE \n" |
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| 219 | "mfc0 $8, $12 \n" |
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| 220 | "and $8, $8, $9 \n" |
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| 221 | "mtc0 $8, $12 \n" |
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| 222 | ::: "$8","$9"); |
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[158] | 223 | } |
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[743] | 224 | |
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[622] | 225 | //////////////////////////////////////////////////////////////////////////////////////// |
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[743] | 226 | // Access CP0 and mask IRQs |
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[622] | 227 | //////////////////////////////////////////////////////////////////////////////////////// |
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[743] | 228 | in_drivers inline void _sr_write(int sr) |
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[158] | 229 | { |
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[743] | 230 | asm volatile("mtc0 %0, $12 \n" : /* no outputs */ : "r" (sr)); |
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[158] | 231 | } |
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[743] | 232 | |
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| 233 | in_drivers inline int _sr_read() |
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| 234 | { |
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| 235 | int ret; |
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| 236 | asm volatile("mfc0 %0, $12 \n" : "=r" (ret)); |
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| 237 | return ret; |
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| 238 | } |
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| 239 | |
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[622] | 240 | ////////////////////////////////////////////////////////////////////// |
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| 241 | // Invalidate all cache lines corresponding to a memory buffer. |
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| 242 | // This is used by the block_device driver. |
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| 243 | ///////////////////////////////////////////////////////////////////////// |
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| 244 | in_drivers void _dcache_buf_invalidate(const void * buffer, size_t size) |
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| 245 | { |
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| 246 | size_t i; |
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| 247 | size_t dcache_line_size; |
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[158] | 248 | |
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[622] | 249 | // retrieve dcache line size from config register (bits 12:10) |
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| 250 | asm volatile("mfc0 %0, $16, 1" : "=r" (dcache_line_size)); |
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| 251 | |
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| 252 | dcache_line_size = 2 << ((dcache_line_size>>10) & 0x7); |
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| 253 | |
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| 254 | // iterate on lines to invalidate each one of them |
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| 255 | for ( i=0; i<size; i+=dcache_line_size ) |
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| 256 | asm volatile(" cache %0, %1" |
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| 257 | : |
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| 258 | :"i" (0x11), "R" (*((char*)buffer+i))); |
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| 259 | } |
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| 260 | |
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[629] | 261 | //////////////////////////////////////////////////////////////////////////// |
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| 262 | // This function makes a physical read access to a 32 bits word in memory, |
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| 263 | // after a temporary paddr extension. |
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| 264 | //////////////////////////////////////////////////////////////////////////// |
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[743] | 265 | in_drivers volatile unsigned int _word_extended_read( unsigned int cluster, |
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| 266 | unsigned int address ) |
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[629] | 267 | { |
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[743] | 268 | int sr = _sr_read(); |
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| 269 | volatile unsigned int value; |
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[629] | 270 | asm volatile( |
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| 271 | "li $3, 0xFFFFFFFE \n" |
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[743] | 272 | "and $3, %3, $3 \n" |
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[629] | 273 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
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| 274 | |
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| 275 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
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| 276 | "lw %0, 0(%1) \n" /* value <= *paddr */ |
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| 277 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
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| 278 | |
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| 279 | : "=r" (value) |
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[743] | 280 | : "r" (address), "r" (cluster), "r" (sr) |
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| 281 | : "$2", "$3", "memory" ); |
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| 282 | |
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| 283 | _sr_write(sr); |
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[629] | 284 | return value; |
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| 285 | } |
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| 286 | //////////////////////////////////////////////////////////////////////////// |
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| 287 | // This function makes a physical read access to a single byte in memory, |
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| 288 | // after a temporary paddr extension. |
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| 289 | //////////////////////////////////////////////////////////////////////////// |
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[743] | 290 | in_drivers volatile unsigned char _byte_extended_read( unsigned int cluster, |
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| 291 | unsigned int address ) |
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[629] | 292 | { |
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[743] | 293 | int sr = _sr_read(); |
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| 294 | volatile unsigned char value; |
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[629] | 295 | asm volatile( |
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| 296 | "li $3, 0xFFFFFFFE \n" |
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[743] | 297 | "and $3, %3, $3 \n" |
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[629] | 298 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
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| 299 | |
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| 300 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
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| 301 | "lb %0, 0(%1) \n" /* value <= *paddr */ |
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| 302 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
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| 303 | |
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| 304 | : "=r" (value) |
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[743] | 305 | : "r" (address), "r" (cluster), "r" (sr) |
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| 306 | : "$2", "$3", "memory" ); |
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| 307 | |
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| 308 | _sr_write(sr); |
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| 309 | return value; |
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[629] | 310 | } |
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| 311 | //////////////////////////////////////////////////////////////////////////// |
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| 312 | // This function makes a physical write access to a 32 bits word in memory, |
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| 313 | // after a temporary DTLB address extension. |
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| 314 | //////////////////////////////////////////////////////////////////////////// |
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| 315 | in_drivers void _word_extended_write( unsigned int cluster, |
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| 316 | unsigned int address, |
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| 317 | unsigned int word ) |
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| 318 | { |
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[743] | 319 | int sr = _sr_read(); |
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[629] | 320 | asm volatile( |
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| 321 | "li $3, 0xFFFFFFFE \n" |
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[743] | 322 | "and $3, %3, $3 \n" |
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[629] | 323 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
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| 324 | |
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| 325 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
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| 326 | "sw %0, 0(%1) \n" /* *paddr <= value */ |
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| 327 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
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| 328 | |
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[743] | 329 | "sync \n" |
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[629] | 330 | : |
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[743] | 331 | : "r" (word), "r" (address), "r" (cluster), "r" (sr) |
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| 332 | : "$2", "$3", "memory"); |
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| 333 | |
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| 334 | _sr_write(sr); |
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[629] | 335 | } |
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| 336 | //////////////////////////////////////////////////////////////////////////// |
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| 337 | // This function makes a physical write access to single byte in memory, |
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| 338 | // after a temporary DTLB de-activation and address extension. |
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| 339 | //////////////////////////////////////////////////////////////////////////// |
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| 340 | in_drivers void _byte_extended_write( unsigned int cluster, |
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| 341 | unsigned int address, |
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| 342 | unsigned char byte ) |
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| 343 | { |
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[743] | 344 | int sr = _sr_read(); |
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[629] | 345 | asm volatile( |
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| 346 | "li $3, 0xFFFFFFFE \n" |
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[743] | 347 | "and $3, %3, $3 \n" |
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[629] | 348 | "mtc0 $3, $12 \n" /* IRQ disabled */ |
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| 349 | |
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| 350 | "mtc2 %2, $24 \n" /* PADDR_EXT <= msb */ |
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| 351 | "sb %0, 0(%1) \n" /* *paddr <= value */ |
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| 352 | "mtc2 $0, $24 \n" /* PADDR_EXT <= 0 */ |
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| 353 | |
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[743] | 354 | "sync \n" |
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[629] | 355 | : |
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[743] | 356 | : "r" (byte), "r" (address), "r" (cluster), "r" (sr) |
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| 357 | : "$2", "$3", "memory"); |
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| 358 | |
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| 359 | _sr_write(sr); |
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[629] | 360 | } |
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| 361 | |
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[622] | 362 | /////////////////////////////////////////////////////////////////////////////////////// |
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[629] | 363 | // Exit (suicide) after printing message on TTY0 |
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[622] | 364 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 365 | in_drivers void _exit() |
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[158] | 366 | { |
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[622] | 367 | unsigned int proc_id = _procid(); |
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| 368 | unsigned int l = proc_id % NB_PROCS_MAX; |
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| 369 | unsigned int x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
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| 370 | unsigned int y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
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| 371 | |
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[629] | 372 | _tty_get_lock( 0 ); |
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| 373 | _tty_puts("\n !!! exit proc["); |
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| 374 | _tty_putd( x ); |
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| 375 | _tty_puts(","); |
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| 376 | _tty_putd( y ); |
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| 377 | _tty_puts(","); |
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| 378 | _tty_putd( l ); |
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| 379 | _tty_puts("] !!!\n"); |
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| 380 | _tty_release_lock( 0 ); |
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[622] | 381 | |
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| 382 | while(1) asm volatile("nop"); // infinite loop... |
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[158] | 383 | } |
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[622] | 384 | |
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| 385 | ///////////////////////////////////////////////////////////////////////// |
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| 386 | // convert a 32 bits unsigned int to a string of 10 decimal characters. |
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| 387 | ///////////////////////////////////////////////////////////////////////// |
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| 388 | in_drivers void _itoa_dec(unsigned val, char* buf) |
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[158] | 389 | { |
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[622] | 390 | const char DecTab[] = "0123456789"; |
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| 391 | unsigned int i; |
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| 392 | for( i=0 ; i<10 ; i++ ) |
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| 393 | { |
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| 394 | if( (val!=0) || (i==0) ) buf[9-i] = DecTab[val % 10]; |
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| 395 | else buf[9-i] = 0x20; |
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| 396 | val /= 10; |
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[158] | 397 | } |
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| 398 | } |
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[622] | 399 | ////////////////////////////////////////////////////////////////////////// |
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| 400 | // convert a 32 bits unsigned int to a string of 8 hexadecimal characters. |
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| 401 | /////////////////////////////////////////////////////////////////////////// |
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| 402 | in_drivers void _itoa_hex(unsigned int val, char* buf) |
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[158] | 403 | { |
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[622] | 404 | const char HexaTab[] = "0123456789ABCD"; |
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| 405 | unsigned int i; |
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| 406 | for( i=0 ; i<8 ; i++ ) |
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| 407 | { |
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| 408 | buf[7-i] = HexaTab[val % 16]; |
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| 409 | val /= 16; |
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[158] | 410 | } |
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| 411 | } |
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[622] | 412 | |
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| 413 | |
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| 414 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 415 | // VCI MULTI_TTY |
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| 416 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 417 | // The total number of TTY terminals is defined by NB_TTY_CHANNELS. |
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[629] | 418 | // - If there is only one terminal, it is supposed to be shared, and used by |
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| 419 | // all processors: a lock must be taken before display. |
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| 420 | // - If there is several terminals, and the number of processors is smaller |
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| 421 | // than the number of terminals, there is one terminal per processor, but |
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| 422 | // the TTY index is not equal to the proc_id, due to cluster indexing policy: |
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| 423 | // proc_id = cluster_xy * NB_PROCS_MAX + local_id (with cluster_xy = x << Y_WIDTH + y) |
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| 424 | // tty_id = cluster_id * NB_PROCS_MAX + local_id (with cluster_id = x * Y_SIZE + y) |
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| 425 | // - If the computed tty_id is larger than NB_TTY_CHANNELS, an error is returned. |
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[622] | 426 | /////////////////////////////////////////////////////////////////////////////////////// |
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[629] | 427 | |
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| 428 | /////////////////////////////////////////////////////////////////////////////////////// |
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[622] | 429 | // Write one or several characters directly from a fixed length user buffer |
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| 430 | // to the TTY_WRITE register of the TTY controler. |
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[629] | 431 | // The channel index must be checked by the calling function. |
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[622] | 432 | // This is a non blocking call : it test the TTY_STATUS register. |
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| 433 | // If the TTY_STATUS_WRITE bit is set, the transfer stops and the function |
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| 434 | // returns the number of characters that have been actually written. |
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| 435 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 436 | in_drivers int _tty_write( char* buffer, |
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| 437 | unsigned int length, |
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| 438 | unsigned int channel ) |
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[158] | 439 | { |
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[743] | 440 | unsigned int base = (unsigned int)&seg_tty_base + channel*TTY_SPAN*4; |
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| 441 | unsigned int nwritten = 0; |
---|
[629] | 442 | unsigned int status; |
---|
[743] | 443 | unsigned int i; |
---|
[622] | 444 | |
---|
| 445 | for ( i=0 ; i < length ; i++ ) |
---|
[158] | 446 | { |
---|
[743] | 447 | status = _word_extended_read( CLUSTER_IO, base + TTY_STATUS*4 ); |
---|
| 448 | if ( (status & 0x2) == 0x2 ) break; |
---|
| 449 | else |
---|
[622] | 450 | { |
---|
[743] | 451 | _byte_extended_write( CLUSTER_IO, base + TTY_WRITE*4 , buffer[i] ); |
---|
| 452 | nwritten++; |
---|
[622] | 453 | } |
---|
[158] | 454 | } |
---|
[622] | 455 | |
---|
| 456 | return nwritten; |
---|
[158] | 457 | } |
---|
[629] | 458 | |
---|
[622] | 459 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 460 | // Fetch one character directly from the TTY_READ register of the TTY controler, |
---|
| 461 | // and writes this character to the user buffer. |
---|
[629] | 462 | // The channel index must be checked by the calling function. |
---|
[622] | 463 | // This is a non blocking call : it returns 0 if the register is empty, |
---|
| 464 | // and returns 1 if the register is full. |
---|
| 465 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 466 | in_drivers int _tty_read( char* buffer, |
---|
| 467 | unsigned int channel ) |
---|
[158] | 468 | { |
---|
[743] | 469 | unsigned int base = (unsigned int)&seg_tty_base + channel*TTY_SPAN*4; |
---|
| 470 | unsigned int status; |
---|
[622] | 471 | |
---|
[743] | 472 | status = _word_extended_read( CLUSTER_IO, base + TTY_STATUS*4 ); |
---|
| 473 | if ( (status & 0x1) == 0x1 ) |
---|
[158] | 474 | { |
---|
[743] | 475 | buffer[0] = (char)_word_extended_read( CLUSTER_IO, base + TTY_READ*4 ); |
---|
| 476 | return 1; |
---|
[158] | 477 | } |
---|
[743] | 478 | return 0; |
---|
[158] | 479 | } |
---|
[629] | 480 | |
---|
[622] | 481 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 482 | // This function displays a string on TTY0. |
---|
| 483 | // The string must be terminated by a NUL character. |
---|
| 484 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 485 | in_drivers void _tty_puts( char* string ) |
---|
[158] | 486 | { |
---|
[622] | 487 | int length = 0; |
---|
| 488 | while (string[length] != 0) length++; |
---|
| 489 | _tty_write( string, length, 0 ); |
---|
| 490 | } |
---|
[158] | 491 | |
---|
[622] | 492 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 493 | // This function displays a 32 bits unsigned int as an hexa string on TTY0. |
---|
| 494 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 495 | in_drivers void _tty_putx(unsigned int val) |
---|
| 496 | { |
---|
| 497 | static const char HexaTab[] = "0123456789ABCDEF"; |
---|
| 498 | char buf[11]; |
---|
| 499 | unsigned int c; |
---|
| 500 | |
---|
| 501 | buf[0] = '0'; |
---|
| 502 | buf[1] = 'x'; |
---|
| 503 | buf[10] = 0; |
---|
| 504 | |
---|
| 505 | for (c = 0; c < 8; c++) |
---|
| 506 | { |
---|
| 507 | buf[9 - c] = HexaTab[val & 0xF]; |
---|
| 508 | val = val >> 4; |
---|
| 509 | } |
---|
| 510 | _tty_puts( buf ); |
---|
| 511 | } |
---|
| 512 | |
---|
| 513 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 514 | // This function displays a 32 bits unsigned int as a decimal string on TTY0. |
---|
| 515 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 516 | in_drivers void _tty_putd( unsigned int val ) |
---|
| 517 | { |
---|
| 518 | static const char DecTab[] = "0123456789"; |
---|
| 519 | char buf[11]; |
---|
| 520 | unsigned int i; |
---|
[743] | 521 | unsigned int first = 0; |
---|
[622] | 522 | |
---|
| 523 | buf[10] = 0; |
---|
| 524 | |
---|
| 525 | for (i = 0; i < 10; i++) |
---|
[158] | 526 | { |
---|
[622] | 527 | if ((val != 0) || (i == 0)) |
---|
| 528 | { |
---|
| 529 | buf[9 - i] = DecTab[val % 10]; |
---|
| 530 | first = 9 - i; |
---|
| 531 | } |
---|
| 532 | else |
---|
| 533 | { |
---|
| 534 | break; |
---|
| 535 | } |
---|
| 536 | val /= 10; |
---|
| 537 | } |
---|
| 538 | _tty_puts( &buf[first] ); |
---|
| 539 | } |
---|
[158] | 540 | |
---|
[622] | 541 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 542 | // This function try to take the hardwired lock protecting exclusive access |
---|
| 543 | // to TTY terminal identified by the channel argument. |
---|
| 544 | // It returns only when the lock has been successfully taken. |
---|
| 545 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 546 | in_drivers void _tty_get_lock( unsigned int channel ) |
---|
| 547 | { |
---|
[743] | 548 | unsigned int base = (unsigned int)&seg_tty_base; |
---|
| 549 | unsigned int offset = (TTY_CONFIG + channel*TTY_SPAN) << 2; |
---|
| 550 | while ( _word_extended_read( CLUSTER_IO, base + offset ) ); |
---|
[622] | 551 | } |
---|
[158] | 552 | |
---|
[622] | 553 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 554 | // This function releases the hardwired lock protecting exclusive access |
---|
| 555 | // to TTY terminal identified by the channel argument. |
---|
| 556 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 557 | in_drivers void _tty_release_lock( unsigned int channel ) |
---|
| 558 | { |
---|
[743] | 559 | unsigned int base = (unsigned int)&seg_tty_base; |
---|
| 560 | unsigned int offset = (TTY_CONFIG + channel*TTY_SPAN) << 2; |
---|
| 561 | _word_extended_write( CLUSTER_IO, base + offset, 0 ); |
---|
[622] | 562 | } |
---|
| 563 | |
---|
| 564 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 565 | // This function fetch a single ascii character from a terminal |
---|
| 566 | // implicitely defined by the processor ID. |
---|
| 567 | // It is a blocking function. |
---|
| 568 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 569 | in_drivers void _tty_getc( char* buf ) |
---|
| 570 | { |
---|
| 571 | unsigned int proc_id = _procid(); |
---|
| 572 | unsigned int channel; |
---|
| 573 | unsigned int l; |
---|
| 574 | unsigned int x; |
---|
| 575 | unsigned int y; |
---|
| 576 | |
---|
[629] | 577 | // check TTY channel |
---|
| 578 | l = (proc_id % NB_PROCS_MAX); |
---|
| 579 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
---|
| 580 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
---|
| 581 | channel = (x * Y_SIZE + y) * NB_PROCS_MAX + l; |
---|
| 582 | if (channel >= NB_TTY_CHANNELS ) |
---|
[622] | 583 | { |
---|
[629] | 584 | _tty_get_lock( 0 ); |
---|
| 585 | _tty_puts( "ERROR in _tty_getc(): TTY index too large\n" ); |
---|
| 586 | _tty_release_lock( 0 ); |
---|
| 587 | _exit(); |
---|
[622] | 588 | } |
---|
| 589 | |
---|
| 590 | while( _tty_read( buf, channel ) == 0 ) asm volatile("nop"); |
---|
[158] | 591 | } |
---|
[622] | 592 | |
---|
| 593 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 594 | // Fetch a string of decimal characters (most significant digit first) |
---|
| 595 | // to build a 32 bits unsigned int. |
---|
| 596 | // The terminal index is implicitely defined by the processor ID. |
---|
| 597 | // This is a blocking function. |
---|
| 598 | // The decimal characters are written in a 32 characters buffer |
---|
| 599 | // until a <LF> or <CR> character is read. |
---|
| 600 | // The <DEL> character is interpreted, and previous characters can be |
---|
| 601 | // cancelled. All others characters are ignored. |
---|
| 602 | // When the <LF> or <CR> character is received, the string is converted |
---|
| 603 | // to an unsigned int value. If the number of decimal digit is too large |
---|
| 604 | // for the 32 bits range, the zero value is returned. |
---|
| 605 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 606 | in_drivers void _tty_getw( unsigned int* word_buffer ) |
---|
[158] | 607 | { |
---|
[622] | 608 | char buf[32]; |
---|
| 609 | char byte; |
---|
| 610 | char cancel_string[3] = { 0x08, 0x20, 0x08 }; |
---|
| 611 | char zero = 0x30; |
---|
| 612 | unsigned int save = 0; |
---|
| 613 | unsigned int val = 0; |
---|
| 614 | unsigned int done = 0; |
---|
| 615 | unsigned int overflow = 0; |
---|
| 616 | unsigned int max = 0; |
---|
| 617 | unsigned int proc_id = _procid(); |
---|
| 618 | unsigned int i; |
---|
| 619 | unsigned int channel; |
---|
| 620 | unsigned int x; |
---|
| 621 | unsigned int y; |
---|
[629] | 622 | unsigned int l; |
---|
[158] | 623 | |
---|
[629] | 624 | // check TTY channel |
---|
| 625 | l = (proc_id % NB_PROCS_MAX); |
---|
| 626 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
---|
| 627 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
---|
| 628 | channel = (x * Y_SIZE + y) * NB_PROCS_MAX + l; |
---|
| 629 | if (channel >= NB_TTY_CHANNELS ) |
---|
[158] | 630 | { |
---|
[629] | 631 | _tty_get_lock( 0 ); |
---|
| 632 | _tty_puts( "ERROR in _tty_getw(): TTY index too large\n" ); |
---|
| 633 | _tty_release_lock( 0 ); |
---|
| 634 | _exit(); |
---|
[622] | 635 | } |
---|
[158] | 636 | |
---|
[622] | 637 | while( done == 0 ) |
---|
| 638 | { |
---|
| 639 | _tty_read( &byte, channel ); |
---|
| 640 | |
---|
| 641 | if (( byte > 0x2F) && (byte < 0x3A)) // decimal character |
---|
[158] | 642 | { |
---|
[622] | 643 | buf[max] = byte; |
---|
| 644 | max++; |
---|
| 645 | _tty_write( &byte, 1, channel ); |
---|
| 646 | } |
---|
| 647 | else if ( (byte == 0x0A) || (byte == 0x0D) ) // LF or CR character |
---|
| 648 | { |
---|
| 649 | done = 1; |
---|
| 650 | } |
---|
| 651 | else if ( byte == 0x7F ) // DEL character |
---|
| 652 | { |
---|
| 653 | if (max > 0) |
---|
[158] | 654 | { |
---|
[622] | 655 | max--; // cancel the character |
---|
| 656 | _tty_write( cancel_string, 3, channel ); |
---|
[158] | 657 | } |
---|
| 658 | } |
---|
| 659 | } // end while |
---|
| 660 | |
---|
| 661 | // string conversion |
---|
| 662 | for( i=0 ; i<max ; i++ ) |
---|
| 663 | { |
---|
| 664 | val = val*10 + (buf[i] - 0x30); |
---|
| 665 | if (val < save) overflow = 1; |
---|
| 666 | save = val; |
---|
| 667 | } |
---|
| 668 | if (overflow == 0) |
---|
| 669 | { |
---|
| 670 | *word_buffer = val; // return decimal value |
---|
| 671 | } |
---|
| 672 | else |
---|
| 673 | { |
---|
| 674 | for( i=0 ; i<max ; i++) // cancel the string |
---|
| 675 | { |
---|
[622] | 676 | _tty_write( cancel_string, 3, channel ); |
---|
[158] | 677 | } |
---|
[622] | 678 | _tty_write( &zero, 1, channel ); |
---|
[158] | 679 | *word_buffer = 0; // return 0 value |
---|
| 680 | } |
---|
| 681 | } |
---|
[622] | 682 | |
---|
| 683 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 684 | // This function is a simplified version of the mutek_printf() function. |
---|
| 685 | // It takes the TTY lock on the selected channel for exclusive access. |
---|
| 686 | // Only a limited number of formats are supported: |
---|
| 687 | // - %d : signed decimal |
---|
| 688 | // - %u : unsigned decimal |
---|
| 689 | // - %x : hexadecimal |
---|
| 690 | // - %c : char |
---|
| 691 | // - %s : string |
---|
| 692 | ////////////////////////////////////////////////////////////////////////////// |
---|
| 693 | in_drivers void _tty_printf( char *format, ...) |
---|
[158] | 694 | { |
---|
| 695 | va_list ap; |
---|
[622] | 696 | va_start( ap, format ); |
---|
[158] | 697 | |
---|
[622] | 698 | unsigned int channel; |
---|
| 699 | unsigned int x; |
---|
| 700 | unsigned int y; |
---|
| 701 | unsigned int proc_id = _procid(); |
---|
| 702 | |
---|
[629] | 703 | // compute TTY channel : |
---|
| 704 | // if the number of TTY channels is smaller |
---|
| 705 | // than the number of clusters, use TTY_0_0 |
---|
| 706 | // else, TTY channel <= cluster index |
---|
| 707 | if ( NB_TTY_CHANNELS < (X_SIZE * Y_SIZE) ) |
---|
[622] | 708 | { |
---|
| 709 | channel = 0; |
---|
| 710 | } |
---|
| 711 | else |
---|
| 712 | { |
---|
| 713 | x = (proc_id / NB_PROCS_MAX) >> Y_WIDTH; |
---|
| 714 | y = (proc_id / NB_PROCS_MAX) & ((1<<Y_WIDTH) - 1); |
---|
[629] | 715 | channel = (x * Y_SIZE + y); |
---|
[622] | 716 | } |
---|
| 717 | |
---|
| 718 | // take the TTY lock |
---|
| 719 | _tty_get_lock( channel ); |
---|
| 720 | |
---|
[158] | 721 | printf_text: |
---|
| 722 | |
---|
[622] | 723 | while (*format) |
---|
| 724 | { |
---|
[158] | 725 | unsigned int i; |
---|
| 726 | for (i = 0; format[i] && format[i] != '%'; i++) |
---|
| 727 | ; |
---|
[622] | 728 | if (i) |
---|
| 729 | { |
---|
| 730 | _tty_write( format, i, channel ); |
---|
[158] | 731 | format += i; |
---|
| 732 | } |
---|
[622] | 733 | if (*format == '%') |
---|
| 734 | { |
---|
[158] | 735 | format++; |
---|
| 736 | goto printf_arguments; |
---|
| 737 | } |
---|
| 738 | } // end while |
---|
| 739 | |
---|
[622] | 740 | va_end( ap ); |
---|
[158] | 741 | |
---|
[622] | 742 | // release lock |
---|
| 743 | _tty_release_lock( 0 ); |
---|
| 744 | |
---|
| 745 | return; |
---|
| 746 | |
---|
[158] | 747 | printf_arguments: |
---|
| 748 | |
---|
| 749 | { |
---|
[622] | 750 | int val = va_arg(ap, long); |
---|
| 751 | char buf[20]; |
---|
| 752 | char* pbuf; |
---|
[158] | 753 | unsigned int len = 0; |
---|
| 754 | static const char HexaTab[] = "0123456789ABCDEF"; |
---|
| 755 | unsigned int i; |
---|
| 756 | |
---|
| 757 | switch (*format++) { |
---|
| 758 | case ('c'): // char conversion |
---|
| 759 | len = 1; |
---|
| 760 | buf[0] = val; |
---|
| 761 | pbuf = buf; |
---|
| 762 | break; |
---|
| 763 | case ('d'): // decimal signed integer |
---|
[622] | 764 | if (val < 0) |
---|
| 765 | { |
---|
[158] | 766 | val = -val; |
---|
[622] | 767 | _tty_write( "_" , 1, channel ); |
---|
[158] | 768 | } |
---|
| 769 | case ('u'): // decimal unsigned integer |
---|
[622] | 770 | for( i=0 ; i<10 ; i++) |
---|
| 771 | { |
---|
[158] | 772 | buf[9-i] = HexaTab[val % 10]; |
---|
| 773 | if (!(val /= 10)) break; |
---|
| 774 | } |
---|
| 775 | len = i+1; |
---|
| 776 | pbuf = &buf[9-i]; |
---|
| 777 | break; |
---|
| 778 | case ('x'): // hexadecimal integer |
---|
[622] | 779 | _tty_write( "0x", 2, channel ); |
---|
| 780 | for( i=0 ; i<8 ; i++) |
---|
| 781 | { |
---|
[158] | 782 | buf[7-i] = HexaTab[val % 16U]; |
---|
| 783 | if (!(val /= 16U)) break; |
---|
| 784 | } |
---|
| 785 | len = i+1; |
---|
| 786 | pbuf = &buf[7-i]; |
---|
| 787 | break; |
---|
| 788 | case ('s'): // string |
---|
| 789 | { |
---|
| 790 | char *str = (char*)val; |
---|
| 791 | while ( str[len] ) len++; |
---|
| 792 | pbuf = (char*)val; |
---|
| 793 | } |
---|
| 794 | break; |
---|
| 795 | default: |
---|
| 796 | goto printf_text; |
---|
| 797 | } // end switch |
---|
| 798 | |
---|
[622] | 799 | _tty_write( pbuf, len, channel ); |
---|
[158] | 800 | goto printf_text; |
---|
| 801 | } |
---|
| 802 | } // end printf() |
---|
| 803 | |
---|
[622] | 804 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 805 | // These functions are the ISRs that must be executed when an IRQ is activated |
---|
[629] | 806 | // by the TTY: _tty_isr_XX is associated to TTY channel [XX]. |
---|
| 807 | // It save the character in the communication buffer _tty_get_buf[XX], |
---|
| 808 | // and set the set/reset variable _tty_get_full[XX]. |
---|
[622] | 809 | // A character is lost if the buffer is full when the ISR is executed. |
---|
| 810 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 811 | in_drivers void _tty_isr_indexed(size_t index) |
---|
[158] | 812 | { |
---|
[743] | 813 | unsigned int base = (unsigned int)&seg_tty_base; |
---|
| 814 | unsigned int offset = (index*TTY_SPAN + TTY_READ) << 2; |
---|
[622] | 815 | |
---|
[743] | 816 | _tty_get_buf[index] = _byte_extended_read(CLUSTER_IO, base + offset); |
---|
[629] | 817 | _tty_get_full[index] = 1; // signals character available |
---|
[158] | 818 | } |
---|
[622] | 819 | |
---|
[629] | 820 | in_drivers void _tty_isr() { _tty_isr_indexed(0); } |
---|
| 821 | |
---|
[622] | 822 | in_drivers void _tty_isr_00() { _tty_isr_indexed(0); } |
---|
| 823 | in_drivers void _tty_isr_01() { _tty_isr_indexed(1); } |
---|
| 824 | in_drivers void _tty_isr_02() { _tty_isr_indexed(2); } |
---|
| 825 | in_drivers void _tty_isr_03() { _tty_isr_indexed(3); } |
---|
| 826 | in_drivers void _tty_isr_04() { _tty_isr_indexed(4); } |
---|
| 827 | in_drivers void _tty_isr_05() { _tty_isr_indexed(5); } |
---|
| 828 | in_drivers void _tty_isr_06() { _tty_isr_indexed(6); } |
---|
| 829 | in_drivers void _tty_isr_07() { _tty_isr_indexed(7); } |
---|
| 830 | in_drivers void _tty_isr_08() { _tty_isr_indexed(8); } |
---|
| 831 | in_drivers void _tty_isr_09() { _tty_isr_indexed(9); } |
---|
| 832 | in_drivers void _tty_isr_10() { _tty_isr_indexed(10); } |
---|
| 833 | in_drivers void _tty_isr_11() { _tty_isr_indexed(11); } |
---|
| 834 | in_drivers void _tty_isr_12() { _tty_isr_indexed(12); } |
---|
| 835 | in_drivers void _tty_isr_13() { _tty_isr_indexed(13); } |
---|
| 836 | in_drivers void _tty_isr_14() { _tty_isr_indexed(14); } |
---|
| 837 | in_drivers void _tty_isr_15() { _tty_isr_indexed(15); } |
---|
| 838 | in_drivers void _tty_isr_16() { _tty_isr_indexed(16); } |
---|
| 839 | in_drivers void _tty_isr_17() { _tty_isr_indexed(17); } |
---|
| 840 | in_drivers void _tty_isr_18() { _tty_isr_indexed(18); } |
---|
| 841 | in_drivers void _tty_isr_19() { _tty_isr_indexed(19); } |
---|
| 842 | in_drivers void _tty_isr_20() { _tty_isr_indexed(20); } |
---|
| 843 | in_drivers void _tty_isr_21() { _tty_isr_indexed(21); } |
---|
| 844 | in_drivers void _tty_isr_22() { _tty_isr_indexed(22); } |
---|
| 845 | in_drivers void _tty_isr_23() { _tty_isr_indexed(23); } |
---|
| 846 | in_drivers void _tty_isr_24() { _tty_isr_indexed(24); } |
---|
| 847 | in_drivers void _tty_isr_25() { _tty_isr_indexed(25); } |
---|
| 848 | in_drivers void _tty_isr_26() { _tty_isr_indexed(26); } |
---|
| 849 | in_drivers void _tty_isr_27() { _tty_isr_indexed(27); } |
---|
| 850 | in_drivers void _tty_isr_28() { _tty_isr_indexed(28); } |
---|
| 851 | in_drivers void _tty_isr_29() { _tty_isr_indexed(29); } |
---|
| 852 | in_drivers void _tty_isr_30() { _tty_isr_indexed(30); } |
---|
| 853 | in_drivers void _tty_isr_31() { _tty_isr_indexed(31); } |
---|
| 854 | |
---|
| 855 | |
---|
| 856 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 857 | // BLOCK_DEVICE (IOC) |
---|
| 858 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
[631] | 859 | // The block size is 512 bytes. |
---|
[629] | 860 | // The functions below use the three variables _ioc_lock _ioc_done, |
---|
[622] | 861 | // and _ioc_status for synchronisation. |
---|
| 862 | // - As the IOC component can be used by several programs running in parallel, |
---|
| 863 | // the _ioc_lock variable guaranties exclusive access to the device. |
---|
| 864 | // The _ioc_read() and _ioc_write() functions use atomic LL/SC to get the lock. |
---|
| 865 | // and set _ioc_lock to a non zero value. |
---|
| 866 | // The _ioc_write() and _ioc_read() functions are blocking, polling the _ioc_lock |
---|
| 867 | // variable until the device is available. |
---|
| 868 | // - When the tranfer is completed, the ISR routine activated by the IOC IRQ |
---|
| 869 | // set the _ioc_done variable to a non-zero value. Possible address errors detected |
---|
| 870 | // by the IOC peripheral are reported by the ISR in the _ioc_status variable. |
---|
| 871 | // The _ioc_completed() function is polling the _ioc_done variable, waiting for |
---|
| 872 | // tranfer conpletion. When the completion is signaled, the _ioc_completed() function |
---|
| 873 | // reset the _ioc_done variable to zero, and releases the _ioc_lock variable. |
---|
| 874 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
[631] | 875 | // If USE_RAMDISK is set, we access a "virtual" block device controler implemented |
---|
| 876 | // as a memory-mapped segment in cluster [0,0] at address seg_ramdisk_base. |
---|
| 877 | // The tranfer being fully synchronous, the IOC interrupt is not activated. |
---|
[629] | 878 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 879 | |
---|
| 880 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
[622] | 881 | // This blocking function is used by the _ioc_read() and _ioc_write() functions |
---|
| 882 | // to get _ioc_lock using LL/SC. |
---|
| 883 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 884 | in_drivers void _ioc_get_lock() |
---|
[158] | 885 | { |
---|
[743] | 886 | register unsigned int* plock = (unsigned int*)&_ioc_lock; |
---|
[622] | 887 | |
---|
[743] | 888 | asm volatile ( |
---|
| 889 | "1: \n" |
---|
| 890 | "ll $2, 0(%0) \n" // $2 <= _ioc_lock |
---|
| 891 | "bnez $2, 1b \n" // retry if busy |
---|
| 892 | "li $3, 1 \n" // prepare argument for sc |
---|
| 893 | "sc $3, 0(%0) \n" // try to set _ioc_busy |
---|
| 894 | "beqz $3, 1b \n" // retry if not atomic |
---|
| 895 | ::"r"(plock) :"$2","$3"); |
---|
[158] | 896 | } |
---|
[629] | 897 | |
---|
[622] | 898 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 899 | // Transfer data from a memory buffer to the block_device. |
---|
| 900 | // - lba : first block index on the disk |
---|
| 901 | // - buffer : base address of the memory buffer |
---|
| 902 | // - count : number of blocks to be transfered |
---|
[629] | 903 | // - ext : cluster index for the memory buffer |
---|
[622] | 904 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 905 | in_drivers void _ioc_write( size_t lba, |
---|
| 906 | void* buffer, |
---|
| 907 | size_t count, |
---|
| 908 | size_t ext ) |
---|
[158] | 909 | { |
---|
[622] | 910 | // get the lock |
---|
| 911 | _ioc_get_lock(); |
---|
| 912 | |
---|
[631] | 913 | if ( USE_RAMDISK ) // we use an extended_memcpy |
---|
[629] | 914 | { |
---|
[631] | 915 | unsigned int src_address = (unsigned int)buffer; |
---|
| 916 | unsigned int src_cluster = ext; |
---|
| 917 | unsigned int dst_address = (unsigned int)&seg_ramdisk_base + lba*512; |
---|
| 918 | unsigned int dst_cluster = 0; |
---|
| 919 | |
---|
| 920 | _extended_memcpy( dst_cluster, |
---|
| 921 | dst_address, |
---|
| 922 | src_cluster, |
---|
| 923 | src_address, |
---|
| 924 | count*512 ); |
---|
| 925 | |
---|
| 926 | _ioc_status = BLOCK_DEVICE_WRITE_SUCCESS; |
---|
| 927 | _ioc_done = 1; |
---|
[629] | 928 | |
---|
[743] | 929 | return; |
---|
[629] | 930 | } |
---|
| 931 | |
---|
[743] | 932 | unsigned int base = (unsigned int)&seg_ioc_base; |
---|
| 933 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_BUFFER*4, (unsigned int)buffer ); |
---|
| 934 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_BUFFER_EXT*4, ext ); |
---|
| 935 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_COUNT*4, count ); |
---|
| 936 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_LBA*4, lba ); |
---|
| 937 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_IRQ_ENABLE*4, 1 ); |
---|
| 938 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_OP*4, BLOCK_DEVICE_WRITE ); |
---|
[158] | 939 | } |
---|
[629] | 940 | |
---|
[622] | 941 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 942 | // Transfer data from a file on the block device to a memory buffer. |
---|
| 943 | // - lba : first block index on the disk |
---|
| 944 | // - buffer : base address of the memory buffer |
---|
| 945 | // - count : number of blocks to be transfered |
---|
[629] | 946 | // - ext : cluster index for the memory buffer |
---|
[622] | 947 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 948 | in_drivers void _ioc_read( size_t lba, |
---|
| 949 | void* buffer, |
---|
| 950 | size_t count, |
---|
| 951 | size_t ext ) |
---|
[158] | 952 | { |
---|
[622] | 953 | // get the lock |
---|
| 954 | _ioc_get_lock(); |
---|
| 955 | |
---|
[631] | 956 | if ( USE_RAMDISK ) // we use an extended_memcpy |
---|
[629] | 957 | { |
---|
[631] | 958 | unsigned int dst_address = (unsigned int)buffer; |
---|
| 959 | unsigned int dst_cluster = ext; |
---|
| 960 | unsigned int src_address = (unsigned int)&seg_ramdisk_base + lba*512; |
---|
| 961 | unsigned int src_cluster = 0; |
---|
| 962 | |
---|
| 963 | _extended_memcpy( dst_cluster, |
---|
| 964 | dst_address, |
---|
| 965 | src_cluster, |
---|
| 966 | src_address, |
---|
| 967 | count*512 ); |
---|
| 968 | |
---|
| 969 | _ioc_status = BLOCK_DEVICE_READ_SUCCESS; |
---|
| 970 | _ioc_done = 1; |
---|
[629] | 971 | |
---|
[743] | 972 | return; |
---|
[629] | 973 | } |
---|
| 974 | |
---|
[743] | 975 | const unsigned int base = (unsigned int)&seg_ioc_base; |
---|
| 976 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_BUFFER*4, (unsigned int)buffer ); |
---|
| 977 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_BUFFER_EXT*4, ext ); |
---|
| 978 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_COUNT*4, count ); |
---|
| 979 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_LBA*4, lba ); |
---|
| 980 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_IRQ_ENABLE*4, 1 ); |
---|
| 981 | _word_extended_write( CLUSTER_IO, base + BLOCK_DEVICE_OP*4, BLOCK_DEVICE_READ ); |
---|
[158] | 982 | } |
---|
[629] | 983 | |
---|
[743] | 984 | in_drivers inline unsigned int _ioc_get_blocksize() { |
---|
| 985 | const unsigned int base = (unsigned int)&seg_ioc_base; |
---|
| 986 | return _word_extended_read( CLUSTER_IO, base + BLOCK_DEVICE_BLOCK_SIZE*4 ); |
---|
| 987 | } |
---|
| 988 | |
---|
[622] | 989 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 990 | // This blocking function cheks completion of an I/O transfer and reports errors. |
---|
| 991 | // It returns 0 if the transfer is successfully completed. |
---|
| 992 | // It returns -1 if an error has been reported. |
---|
| 993 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 994 | in_drivers void _ioc_completed() |
---|
[158] | 995 | { |
---|
[622] | 996 | // waiting for completion |
---|
| 997 | while (_ioc_done == 0) asm volatile("nop"); |
---|
| 998 | |
---|
| 999 | // reset synchronisation variables |
---|
| 1000 | _ioc_done = 0; |
---|
| 1001 | _ioc_lock = 0; |
---|
| 1002 | |
---|
| 1003 | if( (_ioc_status != BLOCK_DEVICE_READ_SUCCESS) && |
---|
| 1004 | (_ioc_status != BLOCK_DEVICE_WRITE_SUCCESS) ) |
---|
| 1005 | { |
---|
| 1006 | _tty_get_lock( 0 ); |
---|
| 1007 | _tty_puts( "ERROR in _ioc_completed()\n"); |
---|
| 1008 | _tty_release_lock( 0 ); |
---|
| 1009 | _exit(); |
---|
| 1010 | } |
---|
[158] | 1011 | } |
---|
[629] | 1012 | |
---|
[622] | 1013 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1014 | // This ISR must be executed when an IRQ is activated by IOC to signal completion. |
---|
| 1015 | // It acknowledge the IRQ using the ioc base address, save the status in _ioc_status, |
---|
| 1016 | // and set the _ioc_done variable to signal completion. |
---|
| 1017 | // This variable is defined in the drivers.c file. |
---|
| 1018 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1019 | in_drivers void _ioc_isr() |
---|
[158] | 1020 | { |
---|
[743] | 1021 | unsigned int base = (unsigned int)&seg_ioc_base; |
---|
[629] | 1022 | |
---|
[743] | 1023 | _ioc_status = _word_extended_read( CLUSTER_IO, base + BLOCK_DEVICE_STATUS*4 ); |
---|
| 1024 | _ioc_done = 1; // signals completion |
---|
[158] | 1025 | } |
---|
[622] | 1026 | |
---|
| 1027 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1028 | // FRAME_BUFFER |
---|
[629] | 1029 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
[622] | 1030 | // The _fb_sync_write & _fb_sync_read functions use a memcpy strategy to implement |
---|
| 1031 | // the transfer between a data buffer and the frame buffer. |
---|
| 1032 | // They are blocking until completion of the transfer. |
---|
| 1033 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 1034 | |
---|
| 1035 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
[622] | 1036 | // _fb_sync_write() |
---|
| 1037 | // Transfer data from an user buffer to the frame_buffer device with a memcpy. |
---|
[629] | 1038 | // - offset : offset (in bytes) in the frame buffer |
---|
[622] | 1039 | // - buffer : base address of the memory buffer |
---|
| 1040 | // - length : number of bytes to be transfered |
---|
[629] | 1041 | // - ext : cluster_xy for the user buffer |
---|
[622] | 1042 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 1043 | in_drivers void _fb_sync_write( unsigned int offset, |
---|
| 1044 | unsigned int buffer, |
---|
| 1045 | unsigned int length, |
---|
| 1046 | unsigned int ext ) |
---|
[158] | 1047 | { |
---|
[629] | 1048 | unsigned int src_address = buffer; |
---|
| 1049 | unsigned int src_cluster = ext; |
---|
| 1050 | unsigned int dst_address = (unsigned int)&seg_fbf_base + offset; |
---|
[743] | 1051 | unsigned int dst_cluster = (X_IO << Y_WIDTH) | Y_IO; // cluster_xy for I/O |
---|
[158] | 1052 | |
---|
[629] | 1053 | _extended_memcpy( dst_cluster, |
---|
| 1054 | dst_address, |
---|
| 1055 | src_cluster, |
---|
| 1056 | src_address, |
---|
| 1057 | length ); |
---|
[158] | 1058 | } |
---|
[629] | 1059 | |
---|
[622] | 1060 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1061 | // _fb_sync_read() |
---|
| 1062 | // Transfer data from the frame_buffer device to an user buffer with a memcpy. |
---|
[629] | 1063 | // - offset : offset (in bytes) in the frame buffer |
---|
[622] | 1064 | // - buffer : base address of the memory buffer |
---|
| 1065 | // - length : number of bytes to be transfered |
---|
[629] | 1066 | // - ext : cluster_xy for the user buffer |
---|
[622] | 1067 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
[629] | 1068 | in_drivers void _fb_sync_read( unsigned int offset, |
---|
| 1069 | unsigned int buffer, |
---|
| 1070 | unsigned int length, |
---|
| 1071 | unsigned int ext ) |
---|
[158] | 1072 | { |
---|
[629] | 1073 | unsigned int dst_address = buffer; |
---|
| 1074 | unsigned int dst_cluster = ext; |
---|
| 1075 | unsigned int src_address = (unsigned int)&seg_fbf_base + offset; |
---|
[743] | 1076 | unsigned int src_cluster = (X_IO << Y_WIDTH) | Y_IO; // cluster_xy for I/O |
---|
[622] | 1077 | |
---|
[629] | 1078 | _extended_memcpy( dst_cluster, |
---|
| 1079 | dst_address, |
---|
| 1080 | src_cluster, |
---|
| 1081 | src_address, |
---|
| 1082 | length ); |
---|
[158] | 1083 | } |
---|
[622] | 1084 | |
---|
[631] | 1085 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1086 | // This ISR must be executed when an IRQ is activated by MEMC to signal |
---|
| 1087 | // an error detected by the TSAR memory cache after a write transaction. |
---|
| 1088 | // It displays an error message on the TTY terminal allocated to the processor |
---|
| 1089 | // executing the ISR. |
---|
| 1090 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1091 | in_drivers void _mmc_isr() |
---|
| 1092 | { |
---|
[743] | 1093 | //int* mmc_address = (int*)&seg_mmc_base; |
---|
[631] | 1094 | unsigned int cluster_xy = _procid() / NB_PROCS_MAX; |
---|
| 1095 | |
---|
| 1096 | _tty_printf( "WRITE ERROR signaled by Memory Cache in cluster %x\n", cluster_xy ); |
---|
| 1097 | } |
---|
| 1098 | |
---|
[622] | 1099 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1100 | // Release a software spin-lock |
---|
| 1101 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1102 | in_drivers void _release_lock(size_t index) |
---|
| 1103 | |
---|
[158] | 1104 | { |
---|
[622] | 1105 | if( index >= NB_LOCKS ) |
---|
| 1106 | { |
---|
| 1107 | _tty_get_lock( 0 ); |
---|
| 1108 | _tty_puts( "ERROR in _release_lock()" ); |
---|
| 1109 | _tty_release_lock( 0 ); |
---|
| 1110 | _exit(); |
---|
| 1111 | } |
---|
| 1112 | |
---|
| 1113 | _spin_lock[index] = 0; |
---|
[158] | 1114 | } |
---|
[629] | 1115 | |
---|
[622] | 1116 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1117 | // Try to take a software spin-lock. |
---|
| 1118 | // This is a blocking call, as there is a busy-waiting loop, |
---|
| 1119 | // until the lock is granted to the requester. |
---|
| 1120 | // There is an internal delay of about 100 cycles between |
---|
| 1121 | // two successive lock read, to avoid bus saturation. |
---|
| 1122 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1123 | in_drivers void _get_lock(size_t index) |
---|
[158] | 1124 | { |
---|
[622] | 1125 | if( index >= NB_LOCKS ) |
---|
| 1126 | { |
---|
| 1127 | _tty_get_lock( 0 ); |
---|
| 1128 | _tty_puts( "ERROR in _get_lock()" ); |
---|
| 1129 | _tty_release_lock( 0 ); |
---|
| 1130 | _exit(); |
---|
| 1131 | } |
---|
[158] | 1132 | |
---|
[622] | 1133 | register int delay = ((_proctime() +_procid()) & 0xF) << 4; |
---|
[743] | 1134 | register int * plock = (int *) &_spin_lock[index]; |
---|
[158] | 1135 | |
---|
[743] | 1136 | asm volatile ("_locks_llsc: \n" |
---|
| 1137 | "ll $2, 0(%0) \n" // $2 <= _locks_lock |
---|
| 1138 | "bnez $2, _locks_delay \n" // random delay if busy |
---|
[622] | 1139 | "li $3, 1 \n" // prepare argument for sc |
---|
[743] | 1140 | "sc $3, 0(%0) \n" // try to set _locks_busy |
---|
[622] | 1141 | "bnez $3, _locks_ok \n" // exit if atomic |
---|
| 1142 | "_locks_delay: \n" |
---|
| 1143 | "move $4, %1 \n" // $4 <= delay |
---|
| 1144 | "_locks_loop: \n" |
---|
| 1145 | "addi $4, $4, -1 \n" // $4 <= $4 - 1 |
---|
| 1146 | "beqz $4, _locks_loop \n" // test end delay |
---|
| 1147 | "j _locks_llsc \n" // retry |
---|
[743] | 1148 | "_locks_ok: \n" |
---|
[622] | 1149 | ::"r"(plock),"r"(delay):"$2","$3","$4"); |
---|
[158] | 1150 | } |
---|
| 1151 | |
---|
[622] | 1152 | |
---|
| 1153 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1154 | // This function makes a cooperative initialisation of the barrier: |
---|
| 1155 | // - barrier_count[index] <= N |
---|
| 1156 | // - barrier_lock[index] <= 0 |
---|
| 1157 | // All tasks try to initialize the barrier, but the initialisation |
---|
| 1158 | // is done by only one task, using LL/SC instructions. |
---|
| 1159 | // This cooperative initialisation is questionnable, |
---|
| 1160 | // because the barrier can ony be initialised once... |
---|
| 1161 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1162 | in_drivers void _barrier_init(unsigned int index, unsigned int value) |
---|
[158] | 1163 | { |
---|
[743] | 1164 | register int* pinit = (int*)&_barrier_value[index]; |
---|
| 1165 | register int* pcount = (int*)&_barrier_count[index]; |
---|
| 1166 | register int* plock = (int*)&_barrier_lock[index]; |
---|
[158] | 1167 | |
---|
[622] | 1168 | if ( index >= NB_BARRIERS ) |
---|
| 1169 | { |
---|
| 1170 | _tty_get_lock( 0 ); |
---|
| 1171 | _tty_puts( "ERROR in _barrier_init()" ); |
---|
| 1172 | _tty_release_lock( 0 ); |
---|
| 1173 | _exit(); |
---|
| 1174 | } |
---|
| 1175 | |
---|
| 1176 | // parallel initialisation using atomic instructions LL/SC |
---|
[743] | 1177 | asm volatile ("_barrier_init_test: \n" |
---|
| 1178 | "ll $2, 0(%0) \n" // read barrier_value |
---|
| 1179 | "bnez $2, _barrier_init_done \n" |
---|
| 1180 | "move $3, %3 \n" |
---|
| 1181 | "sc $3, 0(%0) \n" // try to write barrier_value |
---|
| 1182 | "beqz $3, _barrier_init_test \n" |
---|
| 1183 | "move $3, %3 \n" |
---|
| 1184 | "sw $3, 0(%1) \n" // barrier_count <= barrier_value |
---|
[622] | 1185 | "move $3, $0 \n" // |
---|
[743] | 1186 | "sw $3, 0(%2) \n" // barrier_lock <= 0 |
---|
| 1187 | "_barrier_init_done: \n" |
---|
[622] | 1188 | ::"r"(pinit),"r"(pcount),"r"(plock),"r"(value):"$2","$3"); |
---|
[158] | 1189 | } |
---|
[629] | 1190 | |
---|
[622] | 1191 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1192 | // This blocking function uses a busy_wait technics (on the barrier_lock value), |
---|
| 1193 | // because the GIET does not support dynamic scheduling/descheduling of tasks. |
---|
| 1194 | // The barrier state is actually defined by two variables: |
---|
| 1195 | // _barrier_count[index] define the number of particpants that are waiting |
---|
| 1196 | // _barrier_lock[index] define the bool variable whose value is polled |
---|
| 1197 | // The last participant change the value of _barrier_lock[index] to release the barrier... |
---|
| 1198 | // There is at most 16 independant barriers, and an error is returned |
---|
| 1199 | // if the barrier index is larger than 15. |
---|
| 1200 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1201 | in_drivers void _barrier_wait(unsigned int index) |
---|
[158] | 1202 | { |
---|
[743] | 1203 | register int* pcount = (int*)&_barrier_count[index]; |
---|
| 1204 | register int count; |
---|
| 1205 | int lock = _barrier_lock[index]; |
---|
[158] | 1206 | |
---|
[622] | 1207 | if ( index >= NB_BARRIERS ) |
---|
| 1208 | { |
---|
| 1209 | _tty_get_lock( 0 ); |
---|
| 1210 | _tty_puts( "ERROR in _barrier_wait()" ); |
---|
| 1211 | _tty_release_lock( 0 ); |
---|
| 1212 | _exit(); |
---|
| 1213 | } |
---|
| 1214 | |
---|
| 1215 | // parallel decrement _barrier_count[index] using atomic instructions LL/SC |
---|
| 1216 | // input : pointer on _barrier_count[index] |
---|
| 1217 | // output : count = _barrier_count[index] (before decrementation) |
---|
[743] | 1218 | asm volatile ("_barrier_decrement: \n" |
---|
| 1219 | "ll %0, 0(%1) \n" |
---|
| 1220 | "addi $3, %0, -1 \n" |
---|
| 1221 | "sc $3, 0(%1) \n" |
---|
| 1222 | "beqz $3, _barrier_decrement \n" |
---|
[622] | 1223 | :"=&r"(count) |
---|
| 1224 | :"r"(pcount) |
---|
| 1225 | :"$2","$3"); |
---|
| 1226 | |
---|
| 1227 | // the last task re-initializes the barrier_ count variable |
---|
| 1228 | // and the barrier_lock variable, waking up all other waiting tasks |
---|
| 1229 | |
---|
[743] | 1230 | if ( count == 1 ) // last task |
---|
[622] | 1231 | { |
---|
| 1232 | _barrier_count[index] = _barrier_value[index]; |
---|
| 1233 | asm volatile( "sync" ); |
---|
| 1234 | _barrier_lock[index] = (lock == 0) ? 1 : 0; |
---|
| 1235 | } |
---|
[743] | 1236 | else // other tasks |
---|
[622] | 1237 | { |
---|
[743] | 1238 | while ( lock == _barrier_lock[index] ); |
---|
[622] | 1239 | } |
---|
| 1240 | } |
---|
| 1241 | |
---|
| 1242 | |
---|
[158] | 1243 | // Local Variables: |
---|
| 1244 | // tab-width: 4; |
---|
| 1245 | // c-basic-offset: 4; |
---|
| 1246 | // c-file-offsets:((innamespace . 0)(inline-open . 0)); |
---|
| 1247 | // indent-tabs-mode: nil; |
---|
| 1248 | // End: |
---|
| 1249 | // |
---|
| 1250 | // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
---|
| 1251 | |
---|