[1] | 1 | /* |
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| 2 | * thread.c - implementation of thread operations (user & kernel) |
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[171] | 3 | * |
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[1] | 4 | * Author Ghassan Almaless (2008,2009,2010,2011,2012) |
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[23] | 5 | * Alain Greiner (2016,2017) |
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[1] | 6 | * |
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| 7 | * Copyright (c) UPMC Sorbonne Universites |
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| 8 | * |
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[5] | 9 | * This file is part of ALMOS-MKH. |
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[1] | 10 | * |
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[5] | 11 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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[1] | 12 | * under the terms of the GNU General Public License as published by |
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| 13 | * the Free Software Foundation; version 2.0 of the License. |
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| 14 | * |
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[5] | 15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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[1] | 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 18 | * General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU General Public License |
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[5] | 21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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[1] | 22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 23 | */ |
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| 24 | |
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[14] | 25 | #include <kernel_config.h> |
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[1] | 26 | #include <hal_types.h> |
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| 27 | #include <hal_context.h> |
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| 28 | #include <hal_irqmask.h> |
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| 29 | #include <hal_special.h> |
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| 30 | #include <hal_remote.h> |
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| 31 | #include <memcpy.h> |
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| 32 | #include <printk.h> |
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| 33 | #include <cluster.h> |
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| 34 | #include <process.h> |
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| 35 | #include <scheduler.h> |
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[188] | 36 | #include <dev_pic.h> |
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[1] | 37 | #include <core.h> |
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| 38 | #include <list.h> |
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| 39 | #include <xlist.h> |
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| 40 | #include <page.h> |
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| 41 | #include <kmem.h> |
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| 42 | #include <ppm.h> |
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| 43 | #include <thread.h> |
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| 44 | |
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| 45 | ////////////////////////////////////////////////////////////////////////////////////// |
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| 46 | // Extern global variables |
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| 47 | ////////////////////////////////////////////////////////////////////////////////////// |
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| 48 | |
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| 49 | extern process_t process_zero; |
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| 50 | |
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| 51 | ////////////////////////////////////////////////////////////////////////////////////// |
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[16] | 52 | // This function returns a printable string for the thread type. |
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[1] | 53 | ////////////////////////////////////////////////////////////////////////////////////// |
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[5] | 54 | char * thread_type_str( uint32_t type ) |
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| 55 | { |
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[296] | 56 | if ( type == THREAD_USER ) return "USR"; |
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[16] | 57 | else if( type == THREAD_RPC ) return "RPC"; |
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| 58 | else if( type == THREAD_DEV ) return "DEV"; |
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[296] | 59 | else if( type == THREAD_IDLE ) return "IDL"; |
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[5] | 60 | else return "undefined"; |
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| 61 | } |
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| 62 | |
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[1] | 63 | ///////////////////////////////////////////////////////////////////////////////////// |
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[14] | 64 | // This static function allocates physical memory for a thread descriptor. |
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| 65 | // It can be called by the three functions: |
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[1] | 66 | // - thread_user_create() |
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[14] | 67 | // - thread_user_fork() |
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[1] | 68 | // - thread_kernel_create() |
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| 69 | ///////////////////////////////////////////////////////////////////////////////////// |
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[14] | 70 | // @ return pointer on thread descriptor if success / return NULL if failure. |
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[1] | 71 | ///////////////////////////////////////////////////////////////////////////////////// |
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[14] | 72 | static thread_t * thread_alloc() |
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[1] | 73 | { |
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[23] | 74 | page_t * page; // pointer on page descriptor containing thread descriptor |
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[171] | 75 | kmem_req_t req; // kmem request |
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[1] | 76 | |
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| 77 | // allocates memory for thread descriptor + kernel stack |
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| 78 | req.type = KMEM_PAGE; |
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[14] | 79 | req.size = CONFIG_THREAD_DESC_ORDER; |
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[1] | 80 | req.flags = AF_KERNEL | AF_ZERO; |
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| 81 | page = kmem_alloc( &req ); |
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| 82 | |
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[23] | 83 | if( page == NULL ) return NULL; |
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[1] | 84 | |
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[315] | 85 | // return pointer on new thread descriptor |
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| 86 | xptr_t base_xp = ppm_page2base( XPTR(local_cxy , page ) ); |
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| 87 | return (thread_t *)GET_PTR( base_xp ); |
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| 88 | |
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| 89 | } // end thread_alloc() |
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| 90 | |
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| 91 | |
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[14] | 92 | ///////////////////////////////////////////////////////////////////////////////////// |
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[23] | 93 | // This static function releases the physical memory for a thread descriptor. |
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[53] | 94 | // It is called by the three functions: |
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[23] | 95 | // - thread_user_create() |
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| 96 | // - thread_user_fork() |
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| 97 | // - thread_kernel_create() |
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| 98 | ///////////////////////////////////////////////////////////////////////////////////// |
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| 99 | // @ thread : pointer on thread descriptor. |
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| 100 | ///////////////////////////////////////////////////////////////////////////////////// |
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| 101 | static void thread_release( thread_t * thread ) |
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| 102 | { |
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| 103 | kmem_req_t req; |
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| 104 | |
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[315] | 105 | xptr_t base_xp = ppm_base2page( XPTR(local_cxy , thread ) ); |
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| 106 | |
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[23] | 107 | req.type = KMEM_PAGE; |
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[315] | 108 | req.ptr = GET_PTR( base_xp ); |
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[23] | 109 | kmem_free( &req ); |
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| 110 | } |
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| 111 | |
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| 112 | ///////////////////////////////////////////////////////////////////////////////////// |
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[14] | 113 | // This static function initializes a thread descriptor (kernel or user). |
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| 114 | // It can be called by the four functions: |
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| 115 | // - thread_user_create() |
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| 116 | // - thread_user_fork() |
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| 117 | // - thread_kernel_create() |
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| 118 | ///////////////////////////////////////////////////////////////////////////////////// |
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| 119 | // @ thread : pointer on thread descriptor |
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| 120 | // @ process : pointer on process descriptor. |
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| 121 | // @ type : thread type. |
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| 122 | // @ func : pointer on thread entry function. |
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| 123 | // @ args : pointer on thread entry function arguments. |
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| 124 | // @ core_lid : target core local index. |
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| 125 | // @ u_stack_base : stack base (user thread only) |
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| 126 | // @ u_stack_size : stack base (user thread only) |
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| 127 | ///////////////////////////////////////////////////////////////////////////////////// |
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| 128 | static error_t thread_init( thread_t * thread, |
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| 129 | process_t * process, |
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| 130 | thread_type_t type, |
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| 131 | void * func, |
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| 132 | void * args, |
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| 133 | lid_t core_lid, |
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| 134 | intptr_t u_stack_base, |
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| 135 | uint32_t u_stack_size ) |
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| 136 | { |
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| 137 | error_t error; |
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| 138 | trdid_t trdid; // allocated thread identifier |
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| 139 | |
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| 140 | cluster_t * local_cluster = LOCAL_CLUSTER; |
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| 141 | |
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| 142 | // register new thread in process descriptor, and get a TRDID |
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[1] | 143 | spinlock_lock( &process->th_lock ); |
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| 144 | error = process_register_thread( process, thread , &trdid ); |
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| 145 | spinlock_unlock( &process->th_lock ); |
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| 146 | |
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[171] | 147 | if( error ) |
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[1] | 148 | { |
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[14] | 149 | printk("\n[ERROR] in %s : cannot get TRDID\n", __FUNCTION__ ); |
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| 150 | return EINVAL; |
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[1] | 151 | } |
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[14] | 152 | |
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[407] | 153 | // compute thread descriptor size without kernel stack |
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| 154 | uint32_t desc_size = (intptr_t)(&thread->signature) - (intptr_t)thread + 4; |
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| 155 | |
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[1] | 156 | // Initialize new thread descriptor |
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| 157 | thread->trdid = trdid; |
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[171] | 158 | thread->type = type; |
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[1] | 159 | thread->quantum = 0; // TODO |
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| 160 | thread->ticks_nr = 0; // TODO |
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| 161 | thread->time_last_check = 0; |
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| 162 | thread->core = &local_cluster->core_tbl[core_lid]; |
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| 163 | thread->process = process; |
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| 164 | |
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| 165 | thread->local_locks = 0; |
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| 166 | list_root_init( &thread->locks_root ); |
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| 167 | |
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| 168 | thread->remote_locks = 0; |
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| 169 | xlist_root_init( XPTR( local_cxy , &thread->xlocks_root ) ); |
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| 170 | |
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[171] | 171 | thread->u_stack_base = u_stack_base; |
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[1] | 172 | thread->u_stack_size = u_stack_size; |
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[407] | 173 | thread->k_stack_base = (intptr_t)thread + desc_size; |
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| 174 | thread->k_stack_size = CONFIG_THREAD_DESC_SIZE - desc_size; |
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[1] | 175 | |
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| 176 | thread->entry_func = func; // thread entry point |
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| 177 | thread->entry_args = args; // thread function arguments |
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[171] | 178 | thread->flags = 0; // all flags reset |
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[1] | 179 | thread->signals = 0; // no pending signal |
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| 180 | thread->errno = 0; // no error detected |
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[407] | 181 | thread->fork_user = 0; // no user defined placement for fork |
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| 182 | thread->fork_cxy = 0; // user defined target cluster for fork |
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[1] | 183 | |
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| 184 | // thread blocked |
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| 185 | thread->blocked = THREAD_BLOCKED_GLOBAL; |
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| 186 | |
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| 187 | // reset children list |
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| 188 | xlist_root_init( XPTR( local_cxy , &thread->children_root ) ); |
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| 189 | thread->children_nr = 0; |
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| 190 | |
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| 191 | // reset sched list and brothers list |
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| 192 | list_entry_init( &thread->sched_list ); |
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| 193 | xlist_entry_init( XPTR( local_cxy , &thread->brothers_list ) ); |
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| 194 | |
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| 195 | // reset thread info |
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| 196 | memset( &thread->info , 0 , sizeof(thread_info_t) ); |
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| 197 | |
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| 198 | // initialise signature |
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| 199 | thread->signature = THREAD_SIGNATURE; |
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| 200 | |
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[408] | 201 | // FIXME call hal_thread_init() function to initialise the save_sr field |
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| 202 | thread->save_sr = 0xFF13; |
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| 203 | |
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[1] | 204 | // update local DQDT |
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| 205 | dqdt_local_update_threads( 1 ); |
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| 206 | |
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[171] | 207 | // register new thread in core scheduler |
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[1] | 208 | sched_register_thread( thread->core , thread ); |
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| 209 | |
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| 210 | return 0; |
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| 211 | |
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[296] | 212 | } // end thread_init() |
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| 213 | |
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[1] | 214 | ///////////////////////////////////////////////////////// |
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[23] | 215 | error_t thread_user_create( pid_t pid, |
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| 216 | void * start_func, |
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| 217 | void * start_arg, |
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[1] | 218 | pthread_attr_t * attr, |
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[23] | 219 | thread_t ** new_thread ) |
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[1] | 220 | { |
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| 221 | error_t error; |
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| 222 | thread_t * thread; // pointer on created thread descriptor |
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| 223 | process_t * process; // pointer to local process descriptor |
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| 224 | lid_t core_lid; // selected core local index |
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[23] | 225 | vseg_t * vseg; // stack vseg |
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[1] | 226 | |
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[407] | 227 | assert( (attr != NULL) , __FUNCTION__, "pthread attributes must be defined" ); |
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[5] | 228 | |
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[23] | 229 | // get process descriptor local copy |
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| 230 | process = process_get_local_copy( pid ); |
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[1] | 231 | |
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[23] | 232 | if( process == NULL ) |
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| 233 | { |
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| 234 | printk("\n[ERROR] in %s : cannot get process descriptor %x\n", |
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| 235 | __FUNCTION__ , pid ); |
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| 236 | return ENOMEM; |
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| 237 | } |
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| 238 | |
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[171] | 239 | // select a target core in local cluster |
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[407] | 240 | if( attr->attributes & PT_ATTR_CORE_DEFINED ) |
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[23] | 241 | { |
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[407] | 242 | core_lid = attr->lid; |
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| 243 | if( core_lid >= LOCAL_CLUSTER->cores_nr ) |
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| 244 | { |
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| 245 | printk("\n[ERROR] in %s : illegal core index attribute = %d\n", |
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| 246 | __FUNCTION__ , core_lid ); |
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| 247 | return EINVAL; |
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| 248 | } |
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[23] | 249 | } |
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[407] | 250 | else |
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| 251 | { |
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| 252 | core_lid = cluster_select_local_core(); |
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| 253 | } |
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[1] | 254 | |
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[171] | 255 | // allocate a stack from local VMM |
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[407] | 256 | vseg = vmm_create_vseg( process, |
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| 257 | VSEG_TYPE_STACK, |
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| 258 | 0, // size unused |
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| 259 | 0, // length unused |
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| 260 | 0, // file_offset unused |
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| 261 | 0, // file_size unused |
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| 262 | XPTR_NULL, // mapper_xp unused |
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| 263 | local_cxy ); |
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[1] | 264 | |
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[170] | 265 | if( vseg == NULL ) |
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[23] | 266 | { |
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| 267 | printk("\n[ERROR] in %s : cannot create stack vseg\n", __FUNCTION__ ); |
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| 268 | return ENOMEM; |
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[171] | 269 | } |
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[23] | 270 | |
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[171] | 271 | // allocate memory for thread descriptor |
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[14] | 272 | thread = thread_alloc(); |
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[1] | 273 | |
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[23] | 274 | if( thread == NULL ) |
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| 275 | { |
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| 276 | printk("\n[ERROR] in %s : cannot create new thread\n", __FUNCTION__ ); |
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| 277 | vmm_remove_vseg( vseg ); |
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| 278 | return ENOMEM; |
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| 279 | } |
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[14] | 280 | |
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[171] | 281 | // initialize thread descriptor |
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[14] | 282 | error = thread_init( thread, |
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| 283 | process, |
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| 284 | THREAD_USER, |
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[23] | 285 | start_func, |
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| 286 | start_arg, |
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[14] | 287 | core_lid, |
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[23] | 288 | vseg->min, |
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| 289 | vseg->max - vseg->min ); |
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[14] | 290 | |
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[171] | 291 | if( error ) |
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[14] | 292 | { |
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[23] | 293 | printk("\n[ERROR] in %s : cannot initialize new thread\n", __FUNCTION__ ); |
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| 294 | vmm_remove_vseg( vseg ); |
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| 295 | thread_release( thread ); |
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[14] | 296 | return EINVAL; |
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| 297 | } |
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| 298 | |
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[171] | 299 | // set LOADABLE flag |
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[1] | 300 | thread->flags = THREAD_FLAG_LOADABLE; |
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[14] | 301 | |
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| 302 | // set DETACHED flag if required |
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[407] | 303 | if( attr->attributes & PT_ATTR_DETACH ) |
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| 304 | { |
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| 305 | thread->flags |= THREAD_FLAG_DETACHED; |
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| 306 | } |
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[1] | 307 | |
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[171] | 308 | // allocate & initialize CPU context |
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[407] | 309 | if( hal_cpu_context_create( thread ) ) |
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[23] | 310 | { |
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| 311 | printk("\n[ERROR] in %s : cannot create CPU context\n", __FUNCTION__ ); |
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| 312 | vmm_remove_vseg( vseg ); |
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| 313 | thread_release( thread ); |
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| 314 | return ENOMEM; |
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| 315 | } |
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| 316 | |
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[407] | 317 | // allocate FPU context |
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| 318 | if( hal_fpu_context_alloc( thread ) ) |
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[23] | 319 | { |
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| 320 | printk("\n[ERROR] in %s : cannot create FPU context\n", __FUNCTION__ ); |
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| 321 | vmm_remove_vseg( vseg ); |
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| 322 | thread_release( thread ); |
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| 323 | return ENOMEM; |
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| 324 | } |
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| 325 | |
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[408] | 326 | // update DQDT for new thread |
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| 327 | dqdt_local_update_threads( 1 ); |
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| 328 | |
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[407] | 329 | thread_dmsg("\n[DBG] %s : core[%x,%d] exit / trdid = %x / process %x / core = %d\n", |
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| 330 | __FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, |
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| 331 | thread->trdid , process->pid , core_lid ); |
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[1] | 332 | |
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| 333 | *new_thread = thread; |
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| 334 | return 0; |
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[14] | 335 | |
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[296] | 336 | } // end thread_user_create() |
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| 337 | |
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[408] | 338 | /////////////////////////////////////////////////////// |
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| 339 | error_t thread_user_fork( xptr_t parent_thread_xp, |
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| 340 | process_t * child_process, |
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| 341 | thread_t ** child_thread ) |
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[1] | 342 | { |
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| 343 | error_t error; |
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[408] | 344 | thread_t * child_ptr; // local pointer on local child thread |
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| 345 | lid_t core_lid; // selected core local index |
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[1] | 346 | |
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[408] | 347 | thread_t * parent_ptr; // local pointer on remote parent thread |
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| 348 | cxy_t parent_cxy; // parent thread cluster |
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| 349 | process_t * parent_process; // local pointer on parent process |
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| 350 | xptr_t parent_gpt_xp; // extended pointer on parent thread GPT |
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[5] | 351 | |
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[408] | 352 | void * func; // parent thread entry_func |
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| 353 | void * args; // parent thread entry_args |
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| 354 | intptr_t base; // parent thread u_stack_base |
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| 355 | uint32_t size; // parent thread u_stack_size |
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| 356 | uint32_t flags; // parent_thread flags |
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| 357 | vpn_t vpn_base; // parent thread stack vpn_base |
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| 358 | vpn_t vpn_size; // parent thread stack vpn_size |
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| 359 | reg_t * uzone; // parent thread pointer on uzone |
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| 360 | |
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| 361 | vseg_t * vseg; // child thread STACK vseg |
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| 362 | |
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| 363 | thread_dmsg("\n[DBG] %s : core[%x,%d] enters at cycle %d\n", |
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| 364 | __FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , hal_get_cycles() ); |
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| 365 | |
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[1] | 366 | // select a target core in local cluster |
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| 367 | core_lid = cluster_select_local_core(); |
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| 368 | |
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[408] | 369 | // get cluster and local pointer on parent thread descriptor |
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| 370 | parent_cxy = GET_CXY( parent_thread_xp ); |
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| 371 | parent_ptr = (thread_t *)GET_PTR( parent_thread_xp ); |
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[1] | 372 | |
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[408] | 373 | // get relevant fields from parent thread |
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| 374 | func = (void *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->entry_func ) ); |
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| 375 | args = (void *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->entry_args ) ); |
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| 376 | base = (intptr_t)hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->u_stack_base ) ); |
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| 377 | size = (uint32_t)hal_remote_lw ( XPTR( parent_cxy , &parent_ptr->u_stack_size ) ); |
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| 378 | flags = hal_remote_lw ( XPTR( parent_cxy , &parent_ptr->flags ) ); |
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| 379 | uzone = (reg_t *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->uzone ) ); |
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[1] | 380 | |
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[408] | 381 | vpn_base = base >> CONFIG_PPM_PAGE_SHIFT; |
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| 382 | vpn_size = size >> CONFIG_PPM_PAGE_SHIFT; |
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| 383 | |
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| 384 | // get pointer on parent process in parent thread cluster |
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| 385 | parent_process = (process_t *)hal_remote_lpt( XPTR( parent_cxy, |
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| 386 | &parent_ptr->process ) ); |
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| 387 | |
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| 388 | // get extended pointer on parent GPT in parent thread cluster |
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| 389 | parent_gpt_xp = XPTR( parent_cxy , &parent_process->vmm.gpt ); |
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| 390 | |
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| 391 | // allocate memory for child thread descriptor |
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| 392 | child_ptr = thread_alloc(); |
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| 393 | if( child_ptr == NULL ) |
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[23] | 394 | { |
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| 395 | printk("\n[ERROR] in %s : cannot allocate new thread\n", __FUNCTION__ ); |
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[408] | 396 | return -1; |
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[23] | 397 | } |
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[14] | 398 | |
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[171] | 399 | // initialize thread descriptor |
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[408] | 400 | error = thread_init( child_ptr, |
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| 401 | child_process, |
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[14] | 402 | THREAD_USER, |
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[408] | 403 | func, |
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| 404 | args, |
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[14] | 405 | core_lid, |
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[408] | 406 | base, |
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| 407 | size ); |
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[23] | 408 | if( error ) |
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[14] | 409 | { |
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[408] | 410 | printk("\n[ERROR] in %s : cannot initialize child thread\n", __FUNCTION__ ); |
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| 411 | thread_release( child_ptr ); |
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[14] | 412 | return EINVAL; |
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| 413 | } |
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| 414 | |
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[407] | 415 | // return child pointer |
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[408] | 416 | *child_thread = child_ptr; |
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[1] | 417 | |
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[408] | 418 | // set detached flag if required |
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| 419 | if( flags & THREAD_FLAG_DETACHED ) child_ptr->flags = THREAD_FLAG_DETACHED; |
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[1] | 420 | |
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[408] | 421 | // update uzone pointer in child thread descriptor |
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| 422 | child_ptr->uzone = (char *)((intptr_t)uzone + |
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| 423 | (intptr_t)child_ptr - |
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| 424 | (intptr_t)parent_ptr ); |
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| 425 | |
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| 426 | |
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[407] | 427 | // allocate CPU context for child thread |
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[408] | 428 | if( hal_cpu_context_alloc( child_ptr ) ) |
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[23] | 429 | { |
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[407] | 430 | printk("\n[ERROR] in %s : cannot allocate CPU context\n", __FUNCTION__ ); |
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[408] | 431 | thread_release( child_ptr ); |
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| 432 | return -1; |
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[23] | 433 | } |
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| 434 | |
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[407] | 435 | // allocate FPU context for child thread |
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[408] | 436 | if( hal_fpu_context_alloc( child_ptr ) ) |
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[23] | 437 | { |
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[407] | 438 | printk("\n[ERROR] in %s : cannot allocate FPU context\n", __FUNCTION__ ); |
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[408] | 439 | thread_release( child_ptr ); |
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| 440 | return -1; |
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[23] | 441 | } |
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| 442 | |
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[408] | 443 | // create and initialize STACK vseg |
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| 444 | vseg = vseg_alloc(); |
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| 445 | vseg_init( vseg, |
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| 446 | VSEG_TYPE_STACK, |
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| 447 | base, |
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| 448 | size, |
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| 449 | vpn_base, |
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| 450 | vpn_size, |
---|
| 451 | 0, 0, XPTR_NULL, // not a file vseg |
---|
| 452 | local_cxy ); |
---|
[1] | 453 | |
---|
[408] | 454 | // register STACK vseg in local child VSL |
---|
| 455 | vseg_attach( &child_process->vmm , vseg ); |
---|
| 456 | |
---|
| 457 | // copy all valid STACK GPT entries |
---|
| 458 | vpn_t vpn; |
---|
| 459 | bool_t mapped; |
---|
| 460 | ppn_t ppn; |
---|
| 461 | for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ ) |
---|
| 462 | { |
---|
| 463 | error = hal_gpt_pte_copy( &child_process->vmm.gpt, |
---|
| 464 | parent_gpt_xp, |
---|
| 465 | vpn, |
---|
| 466 | true, // set cow |
---|
| 467 | &ppn, |
---|
| 468 | &mapped ); |
---|
| 469 | if( error ) |
---|
| 470 | { |
---|
| 471 | vseg_detach( &child_process->vmm , vseg ); |
---|
| 472 | vseg_free( vseg ); |
---|
| 473 | thread_release( child_ptr ); |
---|
| 474 | printk("\n[ERROR] in %s : cannot update child GPT\n", __FUNCTION__ ); |
---|
| 475 | return -1; |
---|
| 476 | } |
---|
| 477 | |
---|
| 478 | // increment page descriptor fork_nr for the referenced page if mapped |
---|
| 479 | if( mapped ) |
---|
| 480 | { |
---|
| 481 | xptr_t page_xp = ppm_ppn2page( ppn ); |
---|
| 482 | cxy_t page_cxy = GET_CXY( page_xp ); |
---|
| 483 | page_t * page_ptr = (page_t *)GET_PTR( page_xp ); |
---|
| 484 | hal_remote_atomic_add( XPTR( page_cxy , &page_ptr->fork_nr ) , 1 ); |
---|
| 485 | |
---|
| 486 | thread_dmsg("\n[DBG] %s : core[%x,%d] copied PTE to child GPT : vpn %x\n", |
---|
| 487 | __FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , vpn ); |
---|
| 488 | |
---|
| 489 | } |
---|
| 490 | } |
---|
| 491 | |
---|
| 492 | // set COW flag for STAK vseg in parent thread GPT |
---|
| 493 | hal_gpt_flip_cow( true, // set cow |
---|
| 494 | parent_gpt_xp, |
---|
| 495 | vpn_base, |
---|
| 496 | vpn_size ); |
---|
| 497 | |
---|
| 498 | // update DQDT for child thread |
---|
| 499 | dqdt_local_update_threads( 1 ); |
---|
| 500 | |
---|
[407] | 501 | thread_dmsg("\n[DBG] %s : core[%x,%d] exit / created main thread %x for process %x\n", |
---|
[408] | 502 | __FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, child_ptr->trdid, child_process->pid ); |
---|
[407] | 503 | |
---|
[1] | 504 | return 0; |
---|
[5] | 505 | |
---|
[296] | 506 | } // end thread_user_fork() |
---|
| 507 | |
---|
[1] | 508 | ///////////////////////////////////////////////////////// |
---|
| 509 | error_t thread_kernel_create( thread_t ** new_thread, |
---|
| 510 | thread_type_t type, |
---|
[171] | 511 | void * func, |
---|
| 512 | void * args, |
---|
[1] | 513 | lid_t core_lid ) |
---|
| 514 | { |
---|
| 515 | error_t error; |
---|
[14] | 516 | thread_t * thread; // pointer on new thread descriptor |
---|
[1] | 517 | |
---|
[407] | 518 | thread_dmsg("\n[DBG] %s : core[%x,%d] enters / type % / cycle %d\n", |
---|
| 519 | __FUNCTION__ , local_cxy , core_lid , thread_type_str( type ) , hal_time_stamp() ); |
---|
[1] | 520 | |
---|
[407] | 521 | assert( ( (type == THREAD_IDLE) || (type == THREAD_RPC) || (type == THREAD_DEV) ) , |
---|
| 522 | __FUNCTION__ , "illegal thread type" ); |
---|
[1] | 523 | |
---|
[171] | 524 | assert( (core_lid < LOCAL_CLUSTER->cores_nr) , |
---|
[5] | 525 | __FUNCTION__ , "illegal core_lid" ); |
---|
[1] | 526 | |
---|
[171] | 527 | // allocate memory for new thread descriptor |
---|
[14] | 528 | thread = thread_alloc(); |
---|
| 529 | |
---|
| 530 | if( thread == NULL ) return ENOMEM; |
---|
| 531 | |
---|
[171] | 532 | // initialize thread descriptor |
---|
[14] | 533 | error = thread_init( thread, |
---|
| 534 | &process_zero, |
---|
| 535 | type, |
---|
| 536 | func, |
---|
| 537 | args, |
---|
| 538 | core_lid, |
---|
| 539 | 0 , 0 ); // no user stack for a kernel thread |
---|
| 540 | |
---|
[171] | 541 | if( error ) // release allocated memory for thread descriptor |
---|
[1] | 542 | { |
---|
[185] | 543 | thread_release( thread ); |
---|
[14] | 544 | return EINVAL; |
---|
[1] | 545 | } |
---|
| 546 | |
---|
[171] | 547 | // allocate & initialize CPU context |
---|
| 548 | hal_cpu_context_create( thread ); |
---|
[14] | 549 | |
---|
[408] | 550 | // update DQDT for kernel thread |
---|
| 551 | dqdt_local_update_threads( 1 ); |
---|
| 552 | |
---|
[407] | 553 | thread_dmsg("\n[DBG] %s : core = [%x,%d] exit / trdid = %x / type %s / cycle %d\n", |
---|
| 554 | __FUNCTION__, local_cxy, core_lid, thread->trdid, thread_type_str(type), hal_time_stamp() ); |
---|
[1] | 555 | |
---|
[171] | 556 | *new_thread = thread; |
---|
[1] | 557 | return 0; |
---|
[5] | 558 | |
---|
[296] | 559 | } // end thread_kernel_create() |
---|
| 560 | |
---|
[14] | 561 | /////////////////////////////////////////////////// |
---|
| 562 | error_t thread_kernel_init( thread_t * thread, |
---|
| 563 | thread_type_t type, |
---|
[171] | 564 | void * func, |
---|
| 565 | void * args, |
---|
[14] | 566 | lid_t core_lid ) |
---|
| 567 | { |
---|
[407] | 568 | assert( (type == THREAD_IDLE) , __FUNCTION__ , "illegal thread type" ); |
---|
[1] | 569 | |
---|
[407] | 570 | assert( (core_lid < LOCAL_CLUSTER->cores_nr) , __FUNCTION__ , "illegal core index" ); |
---|
[14] | 571 | |
---|
| 572 | error_t error = thread_init( thread, |
---|
| 573 | &process_zero, |
---|
| 574 | type, |
---|
| 575 | func, |
---|
| 576 | args, |
---|
| 577 | core_lid, |
---|
| 578 | 0 , 0 ); // no user stack for a kernel thread |
---|
| 579 | |
---|
| 580 | // allocate & initialize CPU context if success |
---|
| 581 | if( error == 0 ) hal_cpu_context_create( thread ); |
---|
[171] | 582 | |
---|
[14] | 583 | return error; |
---|
| 584 | |
---|
[407] | 585 | } // end thread_kernel_init() |
---|
| 586 | |
---|
[1] | 587 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 588 | // TODO: check that all memory dynamically allocated during thread execution |
---|
| 589 | // has been released, using a cache of mmap and malloc requests. [AG] |
---|
| 590 | /////////////////////////////////////////////////////////////////////////////////////// |
---|
| 591 | void thread_destroy( thread_t * thread ) |
---|
| 592 | { |
---|
| 593 | uint32_t tm_start; |
---|
| 594 | uint32_t tm_end; |
---|
[60] | 595 | reg_t state; |
---|
[1] | 596 | |
---|
| 597 | process_t * process = thread->process; |
---|
| 598 | core_t * core = thread->core; |
---|
| 599 | |
---|
[407] | 600 | thread_dmsg("\n[DBG] %s : enters for thread %x in process %x / type = %s\n", |
---|
[5] | 601 | __FUNCTION__ , thread->trdid , process->pid , thread_type_str( thread->type ) ); |
---|
[1] | 602 | |
---|
[5] | 603 | assert( (thread->children_nr == 0) , __FUNCTION__ , "still attached children" ); |
---|
| 604 | |
---|
| 605 | assert( (thread->local_locks == 0) , __FUNCTION__ , "all local locks not released" ); |
---|
[171] | 606 | |
---|
[5] | 607 | assert( (thread->remote_locks == 0) , __FUNCTION__ , "all remote locks not released" ); |
---|
| 608 | |
---|
[101] | 609 | tm_start = hal_get_cycles(); |
---|
[1] | 610 | |
---|
| 611 | // update intrumentation values |
---|
[408] | 612 | process->vmm.pgfault_nr += thread->info.pgfault_nr; |
---|
[1] | 613 | |
---|
| 614 | // release memory allocated for CPU context and FPU context |
---|
| 615 | hal_cpu_context_destroy( thread ); |
---|
| 616 | hal_fpu_context_destroy( thread ); |
---|
| 617 | |
---|
| 618 | // release FPU if required |
---|
| 619 | // TODO This should be done before calling thread_destroy() |
---|
| 620 | hal_disable_irq( &state ); |
---|
| 621 | if( core->fpu_owner == thread ) |
---|
| 622 | { |
---|
| 623 | core->fpu_owner = NULL; |
---|
| 624 | hal_fpu_disable(); |
---|
| 625 | } |
---|
| 626 | hal_restore_irq( state ); |
---|
| 627 | |
---|
[171] | 628 | // remove thread from process th_tbl[] |
---|
[1] | 629 | // TODO This should be done before calling thread_destroy() |
---|
| 630 | ltid_t ltid = LTID_FROM_TRDID( thread->trdid ); |
---|
| 631 | |
---|
| 632 | spinlock_lock( &process->th_lock ); |
---|
| 633 | process->th_tbl[ltid] = XPTR_NULL; |
---|
| 634 | process->th_nr--; |
---|
| 635 | spinlock_unlock( &process->th_lock ); |
---|
| 636 | |
---|
[23] | 637 | // update local DQDT |
---|
| 638 | dqdt_local_update_threads( -1 ); |
---|
| 639 | |
---|
[1] | 640 | // invalidate thread descriptor |
---|
| 641 | thread->signature = 0; |
---|
| 642 | |
---|
| 643 | // release memory for thread descriptor |
---|
[23] | 644 | thread_release( thread ); |
---|
[1] | 645 | |
---|
[101] | 646 | tm_end = hal_get_cycles(); |
---|
[1] | 647 | |
---|
[407] | 648 | thread_dmsg("\n[DBG] %s : exit for thread %x in process %x / duration = %d\n", |
---|
[5] | 649 | __FUNCTION__, thread->trdid , process->pid , tm_end - tm_start ); |
---|
[1] | 650 | |
---|
[407] | 651 | } // end thread_destroy() |
---|
| 652 | |
---|
[1] | 653 | ///////////////////////////////////////////////// |
---|
| 654 | void thread_child_parent_link( xptr_t xp_parent, |
---|
| 655 | xptr_t xp_child ) |
---|
| 656 | { |
---|
[171] | 657 | // get extended pointers on children list root |
---|
| 658 | cxy_t parent_cxy = GET_CXY( xp_parent ); |
---|
[1] | 659 | thread_t * parent_ptr = (thread_t *)GET_PTR( xp_parent ); |
---|
| 660 | xptr_t root = XPTR( parent_cxy , &parent_ptr->children_root ); |
---|
| 661 | |
---|
[171] | 662 | // get extended pointer on children list entry |
---|
| 663 | cxy_t child_cxy = GET_CXY( xp_child ); |
---|
[1] | 664 | thread_t * child_ptr = (thread_t *)GET_PTR( xp_child ); |
---|
| 665 | xptr_t entry = XPTR( child_cxy , &child_ptr->brothers_list ); |
---|
| 666 | |
---|
| 667 | // set the link |
---|
| 668 | xlist_add_first( root , entry ); |
---|
| 669 | hal_remote_atomic_add( XPTR( parent_cxy , &parent_ptr->children_nr ) , 1 ); |
---|
[171] | 670 | } |
---|
[1] | 671 | |
---|
| 672 | /////////////////////////////////////////////////// |
---|
| 673 | void thread_child_parent_unlink( xptr_t xp_parent, |
---|
| 674 | xptr_t xp_child ) |
---|
| 675 | { |
---|
| 676 | // get extended pointer on children list lock |
---|
[171] | 677 | cxy_t parent_cxy = GET_CXY( xp_parent ); |
---|
[1] | 678 | thread_t * parent_ptr = (thread_t *)GET_PTR( xp_parent ); |
---|
| 679 | xptr_t lock = XPTR( parent_cxy , &parent_ptr->children_lock ); |
---|
| 680 | |
---|
[171] | 681 | // get extended pointer on children list entry |
---|
| 682 | cxy_t child_cxy = GET_CXY( xp_child ); |
---|
[1] | 683 | thread_t * child_ptr = (thread_t *)GET_PTR( xp_child ); |
---|
| 684 | xptr_t entry = XPTR( child_cxy , &child_ptr->brothers_list ); |
---|
| 685 | |
---|
| 686 | // get the lock |
---|
| 687 | remote_spinlock_lock( lock ); |
---|
| 688 | |
---|
| 689 | // remove the link |
---|
| 690 | xlist_unlink( entry ); |
---|
| 691 | hal_remote_atomic_add( XPTR( parent_cxy , &parent_ptr->children_nr ) , -1 ); |
---|
[171] | 692 | |
---|
[1] | 693 | // release the lock |
---|
| 694 | remote_spinlock_unlock( lock ); |
---|
| 695 | } |
---|
| 696 | |
---|
| 697 | ///////////////////////////////////////////////// |
---|
| 698 | inline void thread_set_signal( thread_t * thread, |
---|
| 699 | uint32_t mask ) |
---|
| 700 | { |
---|
| 701 | hal_atomic_or( &thread->signals , mask ); |
---|
[407] | 702 | hal_fence(); |
---|
[1] | 703 | } |
---|
[171] | 704 | |
---|
[1] | 705 | /////////////////////////////////////////////////// |
---|
| 706 | inline void thread_reset_signal( thread_t * thread, |
---|
| 707 | uint32_t mask ) |
---|
| 708 | { |
---|
| 709 | hal_atomic_and( &thread->signals , ~mask ); |
---|
[407] | 710 | hal_fence(); |
---|
[1] | 711 | } |
---|
[171] | 712 | |
---|
[1] | 713 | //////////////////////////////// |
---|
| 714 | inline bool_t thread_can_yield() |
---|
| 715 | { |
---|
| 716 | thread_t * this = CURRENT_THREAD; |
---|
[367] | 717 | return (this->local_locks == 0) && (this->remote_locks == 0); |
---|
[1] | 718 | } |
---|
| 719 | |
---|
[367] | 720 | ///////////////////////// |
---|
| 721 | void thread_check_sched() |
---|
[1] | 722 | { |
---|
[338] | 723 | thread_t * this = CURRENT_THREAD; |
---|
[1] | 724 | |
---|
[367] | 725 | if( (this->local_locks == 0) && |
---|
| 726 | (this->remote_locks == 0) && |
---|
| 727 | (this->flags & THREAD_FLAG_SCHED) ) |
---|
| 728 | { |
---|
| 729 | this->flags &= ~THREAD_FLAG_SCHED; |
---|
[408] | 730 | sched_yield( "delayed scheduling" ); |
---|
[367] | 731 | } |
---|
[1] | 732 | |
---|
[407] | 733 | } // end thread_check_sched() |
---|
| 734 | |
---|
| 735 | ///////////////////////////////////// |
---|
| 736 | void thread_block( thread_t * thread, |
---|
| 737 | uint32_t cause ) |
---|
| 738 | { |
---|
| 739 | // set blocking cause |
---|
| 740 | hal_atomic_or( &thread->blocked , cause ); |
---|
| 741 | hal_fence(); |
---|
| 742 | |
---|
| 743 | } // end thread_block() |
---|
| 744 | |
---|
| 745 | ///////////////////////////////////////// |
---|
| 746 | uint32_t thread_unblock( xptr_t thread, |
---|
| 747 | uint32_t cause ) |
---|
| 748 | { |
---|
| 749 | // get thread cluster and local pointer |
---|
| 750 | cxy_t cxy = GET_CXY( thread ); |
---|
| 751 | thread_t * ptr = (thread_t *)GET_PTR( thread ); |
---|
| 752 | |
---|
| 753 | // reset blocking cause |
---|
| 754 | uint32_t previous = hal_remote_atomic_and( XPTR( cxy , &ptr->blocked ) , ~cause ); |
---|
| 755 | hal_fence(); |
---|
| 756 | |
---|
| 757 | // return a non zero value if the cause bit is modified |
---|
| 758 | return( previous & cause ); |
---|
| 759 | |
---|
| 760 | } // end thread_unblock() |
---|
| 761 | |
---|
[1] | 762 | ///////////////////// |
---|
| 763 | error_t thread_exit() |
---|
| 764 | { |
---|
[60] | 765 | reg_t sr_save; |
---|
[1] | 766 | |
---|
| 767 | thread_t * this = CURRENT_THREAD; |
---|
| 768 | |
---|
| 769 | // test if this thread can be descheduled |
---|
| 770 | if( !thread_can_yield() ) |
---|
| 771 | { |
---|
[407] | 772 | printk("ERROR in %s : locks not released for thread %x in process %x on core[%x,%d]\n", |
---|
| 773 | __FUNCTION__, this->trdid, this->process->pid, local_cxy, this->core->lid ); |
---|
[1] | 774 | return EINVAL; |
---|
| 775 | } |
---|
| 776 | |
---|
| 777 | if( this->flags & THREAD_FLAG_DETACHED ) |
---|
| 778 | { |
---|
| 779 | // if detached set signal and set blocking cause atomically |
---|
| 780 | hal_disable_irq( &sr_save ); |
---|
| 781 | thread_set_signal( this , THREAD_SIG_KILL ); |
---|
| 782 | thread_block( this , THREAD_BLOCKED_EXIT ); |
---|
| 783 | hal_restore_irq( sr_save ); |
---|
| 784 | } |
---|
[171] | 785 | else |
---|
[1] | 786 | { |
---|
[171] | 787 | // if attached, set blocking cause |
---|
[1] | 788 | thread_block( this , THREAD_BLOCKED_EXIT ); |
---|
| 789 | } |
---|
| 790 | |
---|
| 791 | // deschedule |
---|
[408] | 792 | sched_yield( "exit" ); |
---|
[1] | 793 | return 0; |
---|
| 794 | |
---|
[407] | 795 | } // end thread_exit() |
---|
[1] | 796 | |
---|
| 797 | ///////////////////////////////////// |
---|
| 798 | void thread_kill( thread_t * target ) |
---|
| 799 | { |
---|
| 800 | // set SIG_KILL signal in target thread descriptor |
---|
| 801 | thread_set_signal( target , THREAD_SIG_KILL ); |
---|
| 802 | |
---|
| 803 | // set the global blocked bit in target thread descriptor. |
---|
| 804 | thread_block( target , THREAD_BLOCKED_GLOBAL ); |
---|
| 805 | |
---|
[188] | 806 | // send an IPI to schedule the target thread core. |
---|
| 807 | dev_pic_send_ipi( local_cxy , target->core->lid ); |
---|
[1] | 808 | |
---|
[407] | 809 | } // end thread_kill() |
---|
| 810 | |
---|
[14] | 811 | /////////////////////// |
---|
| 812 | void thread_idle_func() |
---|
[1] | 813 | { |
---|
| 814 | while( 1 ) |
---|
| 815 | { |
---|
[408] | 816 | // unmask IRQs |
---|
| 817 | hal_enable_irq( NULL ); |
---|
| 818 | |
---|
[407] | 819 | if( CONFIG_THREAD_IDLE_MODE_SLEEP ) // force core to low-power mode |
---|
| 820 | { |
---|
[1] | 821 | |
---|
[407] | 822 | idle_dmsg("\n[DBG] %s : core[%x][%d] goes to sleep at cycle %d\n", |
---|
| 823 | __FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , hal_get_cycles() ); |
---|
[1] | 824 | |
---|
[407] | 825 | hal_core_sleep(); |
---|
[1] | 826 | |
---|
[407] | 827 | idle_dmsg("\n[DBG] %s : core[%x][%d] wake up at cycle %d\n", |
---|
| 828 | __FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , hal_get_cycles() ); |
---|
| 829 | |
---|
| 830 | } |
---|
| 831 | else // yield each ~ 100000 cycles |
---|
| 832 | |
---|
| 833 | { |
---|
| 834 | hal_fixed_delay( 500000 ); |
---|
| 835 | } |
---|
| 836 | |
---|
| 837 | // force scheduling at each iteration |
---|
[408] | 838 | sched_yield( "idle" ); |
---|
[1] | 839 | } |
---|
[407] | 840 | } // end thread_idle() |
---|
[1] | 841 | |
---|
[407] | 842 | |
---|
[16] | 843 | ///////////////////////////////////////////////// |
---|
| 844 | void thread_user_time_update( thread_t * thread ) |
---|
| 845 | { |
---|
| 846 | // TODO |
---|
[337] | 847 | // printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ ); |
---|
[16] | 848 | } |
---|
[1] | 849 | |
---|
[16] | 850 | /////////////////////////////////////////////////// |
---|
| 851 | void thread_kernel_time_update( thread_t * thread ) |
---|
| 852 | { |
---|
| 853 | // TODO |
---|
[337] | 854 | // printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ ); |
---|
[16] | 855 | } |
---|
| 856 | |
---|
[23] | 857 | ///////////////////////////////////// |
---|
| 858 | xptr_t thread_get_xptr( pid_t pid, |
---|
| 859 | trdid_t trdid ) |
---|
| 860 | { |
---|
| 861 | cxy_t target_cxy; // target thread cluster identifier |
---|
| 862 | ltid_t target_thread_ltid; // target thread local index |
---|
[171] | 863 | thread_t * target_thread_ptr; // target thread local pointer |
---|
[23] | 864 | xptr_t target_process_xp; // extended pointer on target process descriptor |
---|
[171] | 865 | process_t * target_process_ptr; // local pointer on target process descriptor |
---|
[23] | 866 | pid_t target_process_pid; // target process identifier |
---|
| 867 | xlist_entry_t root; // root of list of process in target cluster |
---|
| 868 | xptr_t lock_xp; // extended pointer on lock protecting this list |
---|
[16] | 869 | |
---|
[23] | 870 | // get target cluster identifier and local thread identifier |
---|
| 871 | target_cxy = CXY_FROM_TRDID( trdid ); |
---|
| 872 | target_thread_ltid = LTID_FROM_TRDID( trdid ); |
---|
| 873 | |
---|
| 874 | // get root of list of process descriptors in target cluster |
---|
| 875 | hal_remote_memcpy( XPTR( local_cxy , &root ), |
---|
| 876 | XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ), |
---|
| 877 | sizeof(xlist_entry_t) ); |
---|
| 878 | |
---|
[171] | 879 | // get extended pointer on lock protecting the list of processes |
---|
[23] | 880 | lock_xp = XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_lock ); |
---|
| 881 | |
---|
| 882 | // take the lock protecting the list of processes in target cluster |
---|
| 883 | remote_spinlock_lock( lock_xp ); |
---|
| 884 | |
---|
| 885 | // loop on list of process in target cluster to find the PID process |
---|
| 886 | xptr_t iter; |
---|
| 887 | bool_t found = false; |
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| 888 | XLIST_FOREACH( XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ) , iter ) |
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| 889 | { |
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| 890 | target_process_xp = XLIST_ELEMENT( iter , process_t , local_list ); |
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| 891 | target_process_ptr = (process_t *)GET_PTR( target_process_xp ); |
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| 892 | target_process_pid = hal_remote_lw( XPTR( target_cxy , &target_process_ptr->pid ) ); |
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| 893 | if( target_process_pid == pid ) |
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| 894 | { |
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| 895 | found = true; |
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| 896 | break; |
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| 897 | } |
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| 898 | } |
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| 899 | |
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| 900 | // release the lock protecting the list of processes in target cluster |
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| 901 | remote_spinlock_unlock( lock_xp ); |
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| 902 | |
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| 903 | // check target thread found |
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| 904 | if( found == false ) |
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| 905 | { |
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| 906 | return XPTR_NULL; |
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| 907 | } |
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| 908 | |
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| 909 | // get target thread local pointer |
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| 910 | xptr_t xp = XPTR( target_cxy , &target_process_ptr->th_tbl[target_thread_ltid] ); |
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[171] | 911 | target_thread_ptr = (thread_t *)hal_remote_lpt( xp ); |
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[23] | 912 | |
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| 913 | if( target_thread_ptr == NULL ) |
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| 914 | { |
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| 915 | return XPTR_NULL; |
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| 916 | } |
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| 917 | |
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| 918 | return XPTR( target_cxy , target_thread_ptr ); |
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[171] | 919 | } |
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[23] | 920 | |
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