[533] | 1 | /* |
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| 2 | * soclib_mtty.c - soclib tty driver implementation. |
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| 3 | * |
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| 4 | * Author Alain Greiner (2016,2017,2018) |
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| 5 | * |
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| 6 | * Copyright (c) UPMC Sorbonne Universites |
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| 7 | * |
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| 8 | * This file is part of ALMOS-MKH.. |
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| 9 | * |
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| 10 | * ALMOS-MKH. is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; version 2.0 of the License. |
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| 13 | * |
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| 14 | * ALMOS-MKH. is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with ALMOS-MKH.; if not, write to the Free Software Foundation, |
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |
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| 24 | |
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| 25 | #include <hal_kernel_types.h> |
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| 26 | #include <dev_txt.h> |
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| 27 | #include <chdev.h> |
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| 28 | #include <soclib_mtty.h> |
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| 29 | #include <remote_spinlock.h> |
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| 30 | #include <thread.h> |
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| 31 | #include <printk.h> |
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| 32 | #include <hal_special.h> |
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| 33 | |
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| 34 | #if (DEBUG_SYS_READ & 1) |
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| 35 | extern uint32_t enter_tty_cmd_read; |
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| 36 | extern uint32_t exit_tty_cmd_read; |
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| 37 | |
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| 38 | extern uint32_t enter_tty_isr_read; |
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| 39 | extern uint32_t exit_tty_isr_read; |
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| 40 | #endif |
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| 41 | |
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| 42 | #if (DEBUG_SYS_WRITE & 1) |
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| 43 | extern uint32_t enter_tty_cmd_write; |
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| 44 | extern uint32_t exit_tty_cmd_write; |
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| 45 | |
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| 46 | extern uint32_t enter_tty_isr_write; |
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| 47 | extern uint32_t exit_tty_isr_write; |
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| 48 | #endif |
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| 49 | |
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| 50 | //////////////////////////////////////////////////////////////////////////////////// |
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| 51 | // These global variables implement the MTTY_RX FIFOs (one per channel) |
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| 52 | //////////////////////////////////////////////////////////////////////////////////// |
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| 53 | |
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| 54 | __attribute__((section(".kdata"))) |
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| 55 | tty_fifo_t tty_rx_fifo[CONFIG_MAX_TXT_CHANNELS]; |
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| 56 | |
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| 57 | __attribute__((section(".kdata"))) |
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| 58 | tty_fifo_t tty_tx_fifo[CONFIG_MAX_TXT_CHANNELS]; |
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| 59 | |
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| 60 | /////////////////////////////////////// |
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| 61 | void soclib_mtty_init( chdev_t * chdev ) |
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| 62 | { |
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| 63 | xptr_t reg_xp; |
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| 64 | |
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| 65 | // initialise function pointers in chdev |
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| 66 | chdev->cmd = &soclib_mtty_cmd; |
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| 67 | chdev->isr = &soclib_mtty_isr; |
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| 68 | chdev->aux = &soclib_mtty_aux; |
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| 69 | |
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| 70 | // get TTY channel and extended pointer on TTY peripheral base address |
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| 71 | xptr_t tty_xp = chdev->base; |
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| 72 | uint32_t channel = chdev->channel; |
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| 73 | bool_t is_rx = chdev->is_rx; |
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| 74 | |
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| 75 | // get SOCLIB_TTY device cluster and local pointer |
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| 76 | cxy_t tty_cxy = GET_CXY( tty_xp ); |
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| 77 | uint32_t * tty_ptr = GET_PTR( tty_xp ); |
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| 78 | |
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| 79 | // enable interruptions for RX but not for TX |
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| 80 | reg_xp = XPTR( tty_cxy , tty_ptr + (channel * MTTY_SPAN) + MTTY_CONFIG ); |
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| 81 | hal_remote_sw( reg_xp , MTTY_CONFIG_RX_ENABLE ); |
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| 82 | |
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| 83 | // reset relevant FIFO |
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| 84 | if( is_rx ) |
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| 85 | { |
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| 86 | tty_rx_fifo[channel].sts = 0; |
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| 87 | tty_rx_fifo[channel].ptr = 0; |
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| 88 | tty_rx_fifo[channel].ptw = 0; |
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| 89 | } |
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| 90 | else |
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| 91 | { |
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| 92 | tty_tx_fifo[channel].sts = 0; |
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| 93 | tty_tx_fifo[channel].ptr = 0; |
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| 94 | tty_tx_fifo[channel].ptw = 0; |
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| 95 | } |
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| 96 | } // end soclib_mtty_init() |
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| 97 | |
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| 98 | ////////////////////////////////////////////////////////////// |
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| 99 | void __attribute__ ((noinline)) soclib_mtty_cmd( xptr_t th_xp ) |
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| 100 | { |
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| 101 | tty_fifo_t * fifo; // MTTY_RX or MTTY_TX FIFO |
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| 102 | char byte; // byte value |
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| 103 | uint32_t done; // number of bytes moved |
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| 104 | |
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| 105 | // get client thread cluster and local pointer |
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| 106 | cxy_t th_cxy = GET_CXY( th_xp ); |
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| 107 | thread_t * th_ptr = GET_PTR( th_xp ); |
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| 108 | |
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| 109 | // get command arguments |
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| 110 | uint32_t type = hal_remote_lw ( XPTR( th_cxy , &th_ptr->txt_cmd.type ) ); |
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| 111 | xptr_t buf_xp = hal_remote_lwd( XPTR( th_cxy , &th_ptr->txt_cmd.buf_xp ) ); |
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| 112 | uint32_t count = hal_remote_lw ( XPTR( th_cxy , &th_ptr->txt_cmd.count ) ); |
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| 113 | xptr_t error_xp = XPTR( th_cxy , &th_ptr->txt_cmd.error ); |
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| 114 | |
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| 115 | #if (DEBUG_SYS_READ & 1) |
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| 116 | if( type == TXT_READ) enter_tty_cmd_read = (uint32_t)hal_get_cycles(); |
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| 117 | #endif |
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| 118 | |
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| 119 | #if (DEBUG_SYS_WRITE & 1) |
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| 120 | if( type == TXT_WRITE) enter_tty_cmd_write = (uint32_t)hal_get_cycles(); |
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| 121 | #endif |
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| 122 | |
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| 123 | // get TXT device cluster and pointers |
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| 124 | xptr_t dev_xp = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->txt_cmd.dev_xp ) ); |
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| 125 | cxy_t dev_cxy = GET_CXY( dev_xp ); |
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| 126 | chdev_t * dev_ptr = GET_PTR( dev_xp ); |
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| 127 | |
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| 128 | // get cluster and pointers for SOCLIB_TTY peripheral base segment |
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| 129 | xptr_t tty_xp = (xptr_t)hal_remote_lwd( XPTR( dev_cxy , &dev_ptr->base ) ); |
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| 130 | cxy_t tty_cxy = GET_CXY( tty_xp ); |
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| 131 | uint32_t * tty_ptr = GET_PTR( tty_xp ); |
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| 132 | |
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| 133 | // get TTY channel index and channel base address |
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| 134 | uint32_t channel = hal_remote_lw( XPTR( dev_cxy , &dev_ptr->channel ) ); |
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| 135 | uint32_t * base = tty_ptr + MTTY_SPAN * channel; |
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| 136 | |
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| 137 | /////////////////////// |
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| 138 | if( type == TXT_WRITE ) // write bytes to MTTY_TX FIFO |
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| 139 | { |
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| 140 | fifo = &tty_tx_fifo[channel]; |
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| 141 | |
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| 142 | done = 0; |
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| 143 | |
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| 144 | while( done < count ) |
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| 145 | { |
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| 146 | if( fifo->sts < MTTY_FIFO_DEPTH ) // put one byte to FIFO if TX_FIFO not full |
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| 147 | { |
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| 148 | // get one byte from command buffer |
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| 149 | byte = hal_remote_lb( buf_xp + done ); |
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| 150 | |
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| 151 | #if DEBUG_HAL_TXT_TX |
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| 152 | uint32_t tx_cycle = (uint32_t)hal_get_cycles(); |
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| 153 | if( DEBUG_HAL_TXT_TX < tx_cycle ) |
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| 154 | printk("\n[DBG] %s : thread %x put character <%c> to TXT%d_TX fifo / cycle %d\n", |
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| 155 | __FUNCTION__, CURRENT_THREAD, byte, channel, tx_cycle ); |
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| 156 | #endif |
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| 157 | // write byte to FIFO |
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| 158 | fifo->data[fifo->ptw] = byte; |
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| 159 | |
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| 160 | // prevent race |
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| 161 | hal_fence(); |
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| 162 | |
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| 163 | // update FIFO state |
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| 164 | fifo->ptw = (fifo->ptw + 1) % MTTY_FIFO_DEPTH; |
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| 165 | hal_atomic_add( &fifo->sts , 1 ); |
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| 166 | |
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| 167 | // udate number of bytes moved |
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| 168 | done++; |
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| 169 | |
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| 170 | // enable TX_IRQ |
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| 171 | xptr_t config_xp = XPTR( tty_cxy , base + MTTY_CONFIG ); |
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| 172 | uint32_t old = hal_remote_lw( config_xp ); |
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| 173 | uint32_t new = old | MTTY_CONFIG_TX_ENABLE; |
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| 174 | hal_remote_atomic_cas( config_xp , old , new ); |
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| 175 | } |
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| 176 | else // block & deschedule if TX_FIFO full |
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| 177 | { |
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| 178 | // block on ISR |
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| 179 | thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_ISR ); |
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| 180 | |
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| 181 | // deschedule |
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| 182 | sched_yield( "MTTY_TX_FIFO full" ); |
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| 183 | } |
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| 184 | } |
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| 185 | |
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| 186 | // set error status in command and return |
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| 187 | hal_remote_sw( error_xp , 0 ); |
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| 188 | } |
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| 189 | /////////////////////////// |
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| 190 | else if( type == TXT_READ ) // read bytes from MTTY_RX FIFO |
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| 191 | { |
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| 192 | fifo = &tty_rx_fifo[channel]; |
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| 193 | |
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| 194 | done = 0; |
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| 195 | |
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| 196 | while( done < count ) |
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| 197 | { |
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| 198 | if( fifo->sts > 0 ) // get byte from FIFO if not empty |
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| 199 | { |
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| 200 | // get one byte from FIFO |
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| 201 | char byte = fifo->data[fifo->ptr]; |
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| 202 | |
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| 203 | #if DEBUG_HAL_TXT_RX |
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| 204 | uint32_t rx_cycle = (uint32_t)hal_get_cycles(); |
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| 205 | if( DEBUG_HAL_TXT_RX < rx_cycle ) |
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| 206 | printk("\n[DBG] %s : thread %x get character <%c> from TXT%d_RX fifo / cycle %d\n", |
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| 207 | __FUNCTION__, CURRENT_THREAD, byte, channel, rx_cycle ); |
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| 208 | #endif |
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| 209 | // update FIFO state |
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| 210 | fifo->ptr = (fifo->ptr + 1) % MTTY_FIFO_DEPTH; |
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| 211 | hal_atomic_add( &fifo->sts , -1 ); |
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| 212 | |
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| 213 | // set byte to command buffer |
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| 214 | hal_remote_sb( buf_xp + done , byte ); |
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| 215 | |
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| 216 | // udate number of bytes |
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| 217 | done++; |
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| 218 | } |
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| 219 | else // deschedule if FIFO empty |
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| 220 | { |
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| 221 | // block on ISR |
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| 222 | thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_ISR ); |
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| 223 | |
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| 224 | // deschedule |
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| 225 | sched_yield( "MTTY_RX_FIFO empty" ); |
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| 226 | } |
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| 227 | } // end while |
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| 228 | |
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| 229 | // set error status in command |
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| 230 | hal_remote_sw( error_xp , 0 ); |
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| 231 | } |
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| 232 | else |
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| 233 | { |
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| 234 | assert( false , __FUNCTION__ , "illegal TXT command\n" ); |
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| 235 | } |
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| 236 | |
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| 237 | #if (DEBUG_SYS_READ & 1) |
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| 238 | if( type == TXT_READ ) exit_tty_cmd_read = (uint32_t)hal_get_cycles(); |
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| 239 | #endif |
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| 240 | |
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| 241 | #if (DEBUG_SYS_WRITE & 1) |
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| 242 | if( type == TXT_WRITE ) exit_tty_cmd_write = (uint32_t)hal_get_cycles(); |
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| 243 | #endif |
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| 244 | |
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| 245 | } // end soclib_mtty_cmd() |
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| 246 | |
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| 247 | ///////////////////////////////////////////////////////////////// |
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| 248 | void __attribute__ ((noinline)) soclib_mtty_isr( chdev_t * chdev ) |
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| 249 | { |
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| 250 | thread_t * server; // pointer on TXT chdev server thread |
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| 251 | lid_t server_lid; // local index of core running the server thread |
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| 252 | uint32_t channel; // TXT chdev channel |
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| 253 | bool_t is_rx; // TXT chdev direction |
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| 254 | char byte; // byte value |
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| 255 | xptr_t owner_xp; // extended pointer on TXT owner process |
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| 256 | cxy_t owner_cxy; // TXT owner process cluster |
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| 257 | process_t * owner_ptr; // local pointer on TXT owner process |
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| 258 | pid_t owner_pid; // TXT owner process identifier |
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| 259 | tty_fifo_t * fifo; // pointer on MTTY_TX or MTTY_RX FIFO |
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| 260 | cxy_t tty_cxy; // soclib_mtty cluster |
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| 261 | uint32_t * tty_ptr; // soclib_mtty segment base address |
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| 262 | uint32_t * base; // soclib_mtty channel base address |
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| 263 | xptr_t status_xp; // extended pointer on MTTY_STATUS register |
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| 264 | xptr_t write_xp; // extended pointer on MTTY_WRITE register |
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| 265 | xptr_t read_xp; // extended pointer on MTTY_READ register |
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| 266 | xptr_t parent_xp; // extended pointer on parent process |
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| 267 | cxy_t parent_cxy; // parent process cluster |
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| 268 | process_t * parent_ptr; // local pointer on parent process |
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| 269 | xptr_t children_lock_xp; // extended pointer on children processes lock |
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| 270 | thread_t * parent_main_ptr; // extended pointer on parent process main thread |
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| 271 | xptr_t parent_main_xp; // local pointer on parent process main thread |
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| 272 | |
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| 273 | // get TXT chdev channel, direction and server thread |
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| 274 | channel = chdev->channel; |
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| 275 | is_rx = chdev->is_rx; |
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| 276 | server = chdev->server; |
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| 277 | server_lid = server->core->lid; |
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| 278 | |
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| 279 | #if (DEBUG_SYS_READ & 1) |
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| 280 | if( is_rx ) enter_tty_isr_read = (uint32_t)hal_get_cycles(); |
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| 281 | #endif |
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| 282 | |
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| 283 | #if (DEBUG_SYS_WRITE & 1) |
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| 284 | if( is_rx == 0 ) enter_tty_isr_write = (uint32_t)hal_get_cycles(); |
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| 285 | #endif |
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| 286 | |
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| 287 | #if DEBUG_HAL_TXT_RX |
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| 288 | uint32_t rx_cycle = (uint32_t)hal_get_cycles(); |
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| 289 | #endif |
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| 290 | |
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| 291 | #if DEBUG_HAL_TXT_TX |
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| 292 | uint32_t tx_cycle = (uint32_t)hal_get_cycles(); |
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| 293 | #endif |
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| 294 | |
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| 295 | // get SOCLIB_TTY peripheral cluster and local pointer |
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| 296 | tty_cxy = GET_CXY( chdev->base ); |
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| 297 | tty_ptr = GET_PTR( chdev->base ); |
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| 298 | |
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| 299 | // get channel base address |
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| 300 | base = tty_ptr + MTTY_SPAN * channel; |
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| 301 | |
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| 302 | // get extended pointer on TTY registers |
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| 303 | status_xp = XPTR( tty_cxy , base + MTTY_STATUS ); |
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| 304 | write_xp = XPTR( tty_cxy , base + MTTY_WRITE ); |
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| 305 | read_xp = XPTR( tty_cxy , base + MTTY_READ ); |
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| 306 | |
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| 307 | /////////////////////////// handle RX ////////////////////// |
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| 308 | if( is_rx ) |
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| 309 | { |
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| 310 | fifo = &tty_rx_fifo[channel]; |
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| 311 | |
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| 312 | // try to move bytes until MTTY_READ register empty |
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| 313 | while( hal_remote_lw( status_xp ) & MTTY_STATUS_RX_FULL ) |
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| 314 | { |
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| 315 | // get one byte from MTTY_READ register & acknowledge RX_IRQ |
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| 316 | byte = (char)hal_remote_lb( read_xp ); |
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| 317 | |
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| 318 | // filter special character ^Z => block TXT owner process |
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| 319 | if( byte == 0x1A ) |
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| 320 | { |
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| 321 | |
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| 322 | #if DEBUG_HAL_TXT_RX |
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| 323 | if( DEBUG_HAL_TXT_RX < rx_cycle ) |
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| 324 | printk("\n[DBG] %s : read ^Z character from TXT%d\n", __FUNCTION__, channel ); |
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| 325 | #endif |
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| 326 | // get pointers on TXT owner process in owner cluster |
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| 327 | owner_xp = process_txt_get_owner( channel ); |
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| 328 | |
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| 329 | // check process exist |
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| 330 | assert( (owner_xp != XPTR_NULL) , __FUNCTION__, |
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| 331 | "TXT owner process not found\n" ); |
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| 332 | |
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| 333 | // get relevant infos on TXT owner process |
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| 334 | owner_cxy = GET_CXY( owner_xp ); |
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| 335 | owner_ptr = GET_PTR( owner_xp ); |
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| 336 | owner_pid = hal_remote_lw( XPTR( owner_cxy , &owner_ptr->pid ) ); |
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| 337 | |
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| 338 | // block TXT owner process only if it is not the INIT process |
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| 339 | if( owner_pid != 1 ) |
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| 340 | { |
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| 341 | // get parent process descriptor pointers |
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| 342 | parent_xp = hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->parent_xp ) ); |
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| 343 | parent_cxy = GET_CXY( parent_xp ); |
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| 344 | parent_ptr = GET_PTR( parent_xp ); |
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| 345 | |
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| 346 | // get extended pointer on lock protecting children list in parent process |
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| 347 | children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock ); |
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| 348 | |
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| 349 | // get pointers on the parent process main thread |
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| 350 | parent_main_ptr = hal_remote_lpt(XPTR(parent_cxy,&parent_ptr->th_tbl[0])); |
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| 351 | parent_main_xp = XPTR( parent_cxy , parent_main_ptr ); |
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| 352 | |
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| 353 | // transfer TXT ownership |
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| 354 | process_txt_transfer_ownership( owner_xp ); |
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| 355 | |
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| 356 | // block all threads in all clusters, but the main thread |
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| 357 | process_sigaction( owner_pid , BLOCK_ALL_THREADS ); |
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| 358 | |
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| 359 | // block the main thread |
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| 360 | xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] ); |
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| 361 | thread_block( main_xp , THREAD_BLOCKED_GLOBAL ); |
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| 362 | |
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| 363 | // atomically update owner process termination state |
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| 364 | hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , |
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| 365 | PROCESS_TERM_STOP ); |
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| 366 | |
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| 367 | // take the children lock and unblock the parent process main thread |
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| 368 | remote_spinlock_lock( children_lock_xp ); |
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| 369 | thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT ); |
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| 370 | remote_spinlock_unlock( children_lock_xp ); |
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| 371 | |
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| 372 | return; |
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| 373 | } |
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| 374 | } |
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| 375 | |
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| 376 | // filter special character ^C => kill TXT owner process |
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| 377 | if( byte == 0x03 ) |
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| 378 | { |
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| 379 | |
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| 380 | #if DEBUG_HAL_TXT_RX |
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| 381 | if( DEBUG_HAL_TXT_RX < rx_cycle ) |
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| 382 | printk("\n[DBG] %s : read ^C character from TXT%d\n", __FUNCTION__, channel ); |
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| 383 | #endif |
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| 384 | // get pointer on TXT owner process in owner cluster |
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| 385 | owner_xp = process_txt_get_owner( channel ); |
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| 386 | |
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| 387 | // check process exist |
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| 388 | assert( (owner_xp != XPTR_NULL) , __FUNCTION__, |
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| 389 | "TXT owner process not found\n" ); |
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| 390 | |
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| 391 | // get relevant infos on TXT owner process |
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| 392 | owner_cxy = GET_CXY( owner_xp ); |
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| 393 | owner_ptr = GET_PTR( owner_xp ); |
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| 394 | owner_pid = hal_remote_lw( XPTR( owner_cxy , &owner_ptr->pid ) ); |
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| 395 | |
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| 396 | // kill TXT owner process only if it is not the INIT process |
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| 397 | if( owner_pid != 1 ) |
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| 398 | { |
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| 399 | // get parent process descriptor pointers |
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| 400 | parent_xp = hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->parent_xp ) ); |
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| 401 | parent_cxy = GET_CXY( parent_xp ); |
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| 402 | parent_ptr = GET_PTR( parent_xp ); |
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| 403 | |
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| 404 | // get extended pointer on lock protecting children list in parent process |
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| 405 | children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock ); |
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| 406 | |
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| 407 | // get pointers on the parent process main thread |
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| 408 | parent_main_ptr = hal_remote_lpt(XPTR(parent_cxy,&parent_ptr->th_tbl[0])); |
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| 409 | parent_main_xp = XPTR( parent_cxy , parent_main_ptr ); |
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| 410 | |
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| 411 | // remove process from TXT list |
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| 412 | process_txt_detach( owner_xp ); |
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| 413 | |
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| 414 | // mark for delete all thread in all clusters, but the main |
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| 415 | process_sigaction( owner_pid , DELETE_ALL_THREADS ); |
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| 416 | |
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| 417 | // block main thread |
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| 418 | xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] ); |
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| 419 | thread_block( main_xp , THREAD_BLOCKED_GLOBAL ); |
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| 420 | |
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| 421 | // atomically update owner process termination state |
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| 422 | hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , |
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| 423 | PROCESS_TERM_KILL ); |
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| 424 | |
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| 425 | // take the children lock and unblock the parent process main thread |
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| 426 | remote_spinlock_lock( children_lock_xp ); |
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| 427 | thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT ); |
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| 428 | remote_spinlock_unlock( children_lock_xp ); |
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| 429 | |
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| 430 | return; |
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| 431 | } |
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| 432 | } |
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| 433 | |
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| 434 | // write byte in MTTY_RX FIFO if not full / discard byte if full |
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| 435 | if ( fifo->sts < MTTY_FIFO_DEPTH ) |
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| 436 | { |
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| 437 | |
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| 438 | #if DEBUG_HAL_TXT_RX |
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| 439 | if( DEBUG_HAL_TXT_RX < rx_cycle ) |
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| 440 | printk("\n[DBG] %s : put character <%c> to TXT%d_RX fifo\n", |
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| 441 | __FUNCTION__, byte, channel ); |
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| 442 | #endif |
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| 443 | // store byte into FIFO |
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| 444 | fifo->data[fifo->ptw] = (char)byte; |
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| 445 | |
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| 446 | // avoid race |
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| 447 | hal_fence(); |
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| 448 | |
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| 449 | // update RX_FIFO state |
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| 450 | fifo->ptw = (fifo->ptw + 1) % MTTY_FIFO_DEPTH; |
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| 451 | hal_atomic_add( &fifo->sts , 1 ); |
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| 452 | |
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| 453 | // unblock TXT_RX server thread |
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| 454 | thread_unblock( XPTR( local_cxy , server ) , THREAD_BLOCKED_ISR ); |
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| 455 | |
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| 456 | // send IPI to core running server thread |
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| 457 | dev_pic_send_ipi( local_cxy , server_lid ); |
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| 458 | } |
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| 459 | else |
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| 460 | { |
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| 461 | printk("\n[WARNING] %s : MTTY_RX_FIFO[%d] full => discard character <%x>\n", |
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| 462 | __FUNCTION__, channel, (uint32_t)byte ); |
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| 463 | } |
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| 464 | } // end while MTTY_READ register full |
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| 465 | |
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| 466 | } // end RX |
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| 467 | |
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| 468 | /////////////////////// handle TX ///////////////////////////// |
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| 469 | else |
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| 470 | { |
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| 471 | fifo = &tty_tx_fifo[channel]; |
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| 472 | |
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| 473 | // try to move bytes until TX_FIFO empty |
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| 474 | while( fifo->sts > 0 ) |
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| 475 | { |
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| 476 | // write one byte to MTTY_WRITE register if empty / exit loop if full |
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| 477 | if( (hal_remote_lw( status_xp ) & MTTY_STATUS_TX_FULL) == 0 ) |
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| 478 | { |
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| 479 | // get one byte from TX_FIFO |
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| 480 | byte = fifo->data[fifo->ptr]; |
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| 481 | |
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| 482 | #if DEBUG_HAL_TXT_TX |
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| 483 | if( DEBUG_HAL_TXT_TX < tx_cycle ) |
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| 484 | printk("\n[DBG] %s : get character <%c> from TXT%d_TX fifo\n", |
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| 485 | __FUNCTION__, byte, channel ); |
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| 486 | #endif |
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| 487 | // update TX_FIFO state |
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| 488 | fifo->ptr = (fifo->ptr + 1) % MTTY_FIFO_DEPTH; |
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| 489 | hal_atomic_add( &fifo->sts , -1 ); |
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| 490 | |
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| 491 | // write byte to MTTY_WRITE register & acknowledge TX_IRQ |
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| 492 | hal_remote_sb( write_xp , byte ); |
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| 493 | } |
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| 494 | } |
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| 495 | |
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| 496 | // disable TX_IRQ |
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| 497 | xptr_t config_xp = XPTR( tty_cxy , base + MTTY_CONFIG ); |
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| 498 | uint32_t old = hal_remote_lw( config_xp ); |
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| 499 | uint32_t new = old & ~(MTTY_CONFIG_TX_ENABLE); |
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| 500 | hal_remote_atomic_cas( config_xp , old , new ); |
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| 501 | //hal_remote_sw( XPTR( tty_cxy , base + MTTY_TX_IRQ_ENABLE ) , 0 ); |
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| 502 | |
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| 503 | // unblock TXT_TX server thread |
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| 504 | thread_unblock( XPTR( local_cxy , server ) , THREAD_BLOCKED_ISR ); |
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| 505 | |
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| 506 | // send IPI to core running server thread |
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| 507 | dev_pic_send_ipi( local_cxy , server_lid ); |
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| 508 | |
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| 509 | } // end TX |
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| 510 | |
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| 511 | hal_fence(); |
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| 512 | |
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| 513 | #if (DEBUG_SYS_READ & 1) |
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| 514 | if( is_rx ) exit_tty_isr_read = (uint32_t)hal_get_cycles(); |
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| 515 | #endif |
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| 516 | |
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| 517 | #if (DEBUG_SYS_WRITE & 1) |
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| 518 | if( is_rx == 0 ) exit_tty_isr_write = (uint32_t)hal_get_cycles(); |
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| 519 | #endif |
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| 520 | |
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| 521 | } // end soclib_mtty_isr() |
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| 522 | |
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| 523 | ///////////////////////////////////////////////////////////// |
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| 524 | void __attribute__ ((noinline)) soclib_mtty_aux( void * args ) |
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| 525 | { |
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| 526 | uint32_t status; |
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| 527 | bool_t empty; |
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| 528 | uint32_t i; |
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| 529 | |
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| 530 | xptr_t dev_xp = ((txt_sync_args_t *)args)->dev_xp; |
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| 531 | char * buffer = ((txt_sync_args_t *)args)->buffer; |
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| 532 | uint32_t count = ((txt_sync_args_t *)args)->count; |
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| 533 | |
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| 534 | // get TXT0 chdev cluster and local pointer |
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| 535 | cxy_t dev_cxy = GET_CXY( dev_xp ); |
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| 536 | chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp ); |
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| 537 | |
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| 538 | // get extended pointer on TTY channel base address |
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| 539 | xptr_t tty_xp = (xptr_t)hal_remote_lwd( XPTR( dev_cxy , &dev_ptr->base ) ); |
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| 540 | |
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| 541 | // get TTY channel segment cluster and local pointer |
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| 542 | cxy_t tty_cxy = GET_CXY( tty_xp ); |
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| 543 | uint32_t * tty_ptr = (uint32_t *)GET_PTR( tty_xp ); |
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| 544 | |
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| 545 | // get extended pointers on MTTY_WRITE & MTTY_STATUS registers |
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| 546 | xptr_t write_xp = XPTR( tty_cxy , tty_ptr + MTTY_WRITE ); |
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| 547 | xptr_t status_xp = XPTR( tty_cxy , tty_ptr + MTTY_STATUS ); |
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| 548 | |
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| 549 | // loop on characters (busy waiting policy) |
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| 550 | for( i = 0 ; i < count ; i++ ) |
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| 551 | { |
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| 552 | do |
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| 553 | { |
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| 554 | // get MTTY_STATUS |
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| 555 | status = hal_remote_lw( status_xp ); |
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| 556 | empty = ( (status & MTTY_STATUS_TX_FULL) == 0 ); |
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| 557 | |
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| 558 | // transfer one byte if TX buffer empty |
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| 559 | if ( empty ) hal_remote_sb( write_xp , buffer[i] ); |
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| 560 | } |
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| 561 | while ( empty == false ); |
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| 562 | } |
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| 563 | } // end soclib_mtty_aux() |
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| 564 | |
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| 565 | |
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| 566 | |
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