[8118303] | 1 | // -*- Mode: CFA -*- |
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| 2 | // |
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| 3 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 4 | // |
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| 5 | // The contents of this file are covered under the licence agreement in the |
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| 6 | // file "LICENCE" distributed with Cforall. |
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| 7 | // |
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| 8 | // kernel.c -- |
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| 9 | // |
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| 10 | // Author : Thierry Delisle |
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[75f3522] | 11 | // Created On : Tue Jan 17 12:27:26 2017 |
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[8118303] | 12 | // Last Modified By : Thierry Delisle |
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| 13 | // Last Modified On : -- |
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| 14 | // Update Count : 0 |
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| 15 | // |
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| 16 | |
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[0c92c9f] | 17 | //Start and stop routine for the kernel, declared first to make sure they run first |
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| 18 | void kernel_startup(void) __attribute__((constructor(101))); |
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| 19 | void kernel_shutdown(void) __attribute__((destructor(101))); |
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| 20 | |
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[8118303] | 21 | //Header |
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[75f3522] | 22 | #include "kernel_private.h" |
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[8118303] | 23 | |
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| 24 | //C Includes |
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[c84e80a] | 25 | #include <stddef.h> |
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[eb2e723] | 26 | extern "C" { |
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[8fcbb4c] | 27 | #include <fenv.h> |
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[eb2e723] | 28 | #include <sys/resource.h> |
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| 29 | } |
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[8118303] | 30 | |
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| 31 | //CFA Includes |
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| 32 | #include "libhdr.h" |
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| 33 | |
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| 34 | //Private includes |
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| 35 | #define __CFA_INVOKE_PRIVATE__ |
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| 36 | #include "invoke.h" |
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| 37 | |
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[8def349] | 38 | //----------------------------------------------------------------------------- |
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| 39 | // Kernel storage |
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| 40 | #define KERNEL_STORAGE(T,X) static char X##_storage[sizeof(T)] |
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| 41 | |
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| 42 | KERNEL_STORAGE(processorCtx_t, systemProcessorCtx); |
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| 43 | KERNEL_STORAGE(cluster, systemCluster); |
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| 44 | KERNEL_STORAGE(processor, systemProcessor); |
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[e15df4c] | 45 | KERNEL_STORAGE(thread, mainThread); |
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[8def349] | 46 | KERNEL_STORAGE(machine_context_t, mainThread_context); |
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| 47 | |
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[bd98b58] | 48 | cluster * systemCluster; |
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[eb2e723] | 49 | processor * systemProcessor; |
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[e15df4c] | 50 | thread * mainThread; |
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[eb2e723] | 51 | |
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[bd98b58] | 52 | //----------------------------------------------------------------------------- |
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| 53 | // Global state |
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| 54 | |
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[8def349] | 55 | thread_local processor * this_processor; |
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| 56 | |
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| 57 | processor * get_this_processor() { |
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| 58 | return this_processor; |
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| 59 | } |
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[c84e80a] | 60 | |
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[bd98b58] | 61 | coroutine * this_coroutine(void) { |
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| 62 | return this_processor->current_coroutine; |
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| 63 | } |
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| 64 | |
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[e15df4c] | 65 | thread * this_thread(void) { |
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[bd98b58] | 66 | return this_processor->current_thread; |
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[c84e80a] | 67 | } |
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| 68 | |
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| 69 | //----------------------------------------------------------------------------- |
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[8def349] | 70 | // Main thread construction |
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| 71 | struct current_stack_info_t { |
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| 72 | machine_context_t ctx; |
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| 73 | unsigned int size; // size of stack |
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| 74 | void *base; // base of stack |
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| 75 | void *storage; // pointer to stack |
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| 76 | void *limit; // stack grows towards stack limit |
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| 77 | void *context; // address of cfa_context_t |
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| 78 | void *top; // address of top of storage |
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[c84e80a] | 79 | }; |
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| 80 | |
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[8def349] | 81 | void ?{}( current_stack_info_t * this ) { |
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| 82 | CtxGet( &this->ctx ); |
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| 83 | this->base = this->ctx.FP; |
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| 84 | this->storage = this->ctx.SP; |
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| 85 | |
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| 86 | rlimit r; |
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[132fad4] | 87 | getrlimit( RLIMIT_STACK, &r); |
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[8def349] | 88 | this->size = r.rlim_cur; |
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| 89 | |
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| 90 | this->limit = (void *)(((intptr_t)this->base) - this->size); |
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| 91 | this->context = &mainThread_context_storage; |
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| 92 | this->top = this->base; |
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| 93 | } |
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| 94 | |
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| 95 | void ?{}( coStack_t * this, current_stack_info_t * info) { |
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| 96 | this->size = info->size; |
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| 97 | this->storage = info->storage; |
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| 98 | this->limit = info->limit; |
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| 99 | this->base = info->base; |
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| 100 | this->context = info->context; |
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| 101 | this->top = info->top; |
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| 102 | this->userStack = true; |
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| 103 | } |
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| 104 | |
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| 105 | void ?{}( coroutine * this, current_stack_info_t * info) { |
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| 106 | (&this->stack){ info }; |
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| 107 | this->name = "Main Thread"; |
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| 108 | this->errno_ = 0; |
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[ee897e4b] | 109 | this->state = Start; |
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[8def349] | 110 | } |
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| 111 | |
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[e15df4c] | 112 | void ?{}( thread * this, current_stack_info_t * info) { |
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[8def349] | 113 | (&this->c){ info }; |
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| 114 | } |
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[c84e80a] | 115 | |
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[8def349] | 116 | //----------------------------------------------------------------------------- |
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| 117 | // Processor coroutine |
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[eb2e723] | 118 | void ?{}(processorCtx_t * this, processor * proc) { |
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| 119 | (&this->c){}; |
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[c84e80a] | 120 | this->proc = proc; |
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[8fcbb4c] | 121 | proc->runner = this; |
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[8def349] | 122 | } |
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| 123 | |
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| 124 | void ?{}(processorCtx_t * this, processor * proc, current_stack_info_t * info) { |
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| 125 | (&this->c){ info }; |
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| 126 | this->proc = proc; |
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[8fcbb4c] | 127 | proc->runner = this; |
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[8def349] | 128 | } |
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| 129 | |
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| 130 | void ?{}(processor * this) { |
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| 131 | this{ systemCluster }; |
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| 132 | } |
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| 133 | |
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| 134 | void ?{}(processor * this, cluster * cltr) { |
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| 135 | this->cltr = cltr; |
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| 136 | this->current_coroutine = NULL; |
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| 137 | this->current_thread = NULL; |
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[db6f06a] | 138 | (&this->terminated){}; |
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| 139 | this->is_terminated = false; |
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[8def349] | 140 | |
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| 141 | start( this ); |
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[c84e80a] | 142 | } |
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| 143 | |
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[8fcbb4c] | 144 | void ?{}(processor * this, cluster * cltr, processorCtx_t * runner) { |
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[8def349] | 145 | this->cltr = cltr; |
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| 146 | this->current_coroutine = NULL; |
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| 147 | this->current_thread = NULL; |
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[db6f06a] | 148 | (&this->terminated){}; |
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| 149 | this->is_terminated = false; |
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[8def349] | 150 | |
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[8fcbb4c] | 151 | this->runner = runner; |
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| 152 | LIB_DEBUG_PRINTF("Kernel : constructing processor context %p\n", runner); |
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| 153 | runner{ this }; |
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[8def349] | 154 | } |
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| 155 | |
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| 156 | void ^?{}(processor * this) { |
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[db6f06a] | 157 | if( ! this->is_terminated ) { |
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[8def349] | 158 | LIB_DEBUG_PRINTF("Kernel : core %p signaling termination\n", this); |
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[db6f06a] | 159 | this->is_terminated = true; |
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| 160 | wait( &this->terminated ); |
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[8def349] | 161 | } |
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| 162 | } |
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| 163 | |
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| 164 | void ?{}(cluster * this) { |
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| 165 | ( &this->ready_queue ){}; |
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[eafb094] | 166 | ( &this->lock ){}; |
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[8def349] | 167 | } |
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| 168 | |
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| 169 | void ^?{}(cluster * this) { |
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[8fcbb4c] | 170 | |
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[c84e80a] | 171 | } |
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| 172 | |
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[75f3522] | 173 | //============================================================================================= |
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| 174 | // Kernel Scheduling logic |
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| 175 | //============================================================================================= |
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[8fcbb4c] | 176 | //Main of the processor contexts |
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| 177 | void main(processorCtx_t * runner) { |
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| 178 | processor * this = runner->proc; |
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[eb2e723] | 179 | LIB_DEBUG_PRINTF("Kernel : core %p starting\n", this); |
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[8118303] | 180 | |
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[e15df4c] | 181 | thread * readyThread = NULL; |
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[db6f06a] | 182 | for( unsigned int spin_count = 0; ! this->is_terminated; spin_count++ ) |
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[75f3522] | 183 | { |
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[bd98b58] | 184 | readyThread = nextThread( this->cltr ); |
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[8118303] | 185 | |
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[75f3522] | 186 | if(readyThread) |
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| 187 | { |
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| 188 | runThread(this, readyThread); |
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| 189 | |
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| 190 | //Some actions need to be taken from the kernel |
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[db6f06a] | 191 | finishRunning(this); |
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[75f3522] | 192 | |
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[c84e80a] | 193 | spin_count = 0; |
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[75f3522] | 194 | } |
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| 195 | else |
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| 196 | { |
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[c84e80a] | 197 | spin(this, &spin_count); |
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| 198 | } |
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| 199 | } |
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[8118303] | 200 | |
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[8def349] | 201 | LIB_DEBUG_PRINTF("Kernel : core %p unlocking thread\n", this); |
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[db6f06a] | 202 | signal( &this->terminated ); |
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[c84e80a] | 203 | LIB_DEBUG_PRINTF("Kernel : core %p terminated\n", this); |
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| 204 | } |
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| 205 | |
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[75f3522] | 206 | // runThread runs a thread by context switching |
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[0c92c9f] | 207 | // from the processor coroutine to the target thread |
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[75f3522] | 208 | void runThread(processor * this, thread * dst) { |
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| 209 | coroutine * proc_cor = get_coroutine(this->runner); |
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| 210 | coroutine * thrd_cor = get_coroutine(dst); |
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| 211 | |
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| 212 | //Reset the terminating actions here |
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[db6f06a] | 213 | this->finish.action_code = No_Action; |
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[8fcbb4c] | 214 | |
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[75f3522] | 215 | //Update global state |
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| 216 | this->current_thread = dst; |
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| 217 | |
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| 218 | // Context Switch to the thread |
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| 219 | ThreadCtxSwitch(proc_cor, thrd_cor); |
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| 220 | // when ThreadCtxSwitch returns we are back in the processor coroutine |
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| 221 | } |
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| 222 | |
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| 223 | // Once a thread has finished running, some of |
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| 224 | // its final actions must be executed from the kernel |
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[db6f06a] | 225 | void finishRunning(processor * this) { |
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| 226 | if( this->finish.action_code == Release ) { |
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| 227 | unlock( this->finish.lock ); |
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| 228 | } |
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| 229 | else if( this->finish.action_code == Schedule ) { |
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| 230 | ScheduleThread( this->finish.thrd ); |
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| 231 | } |
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| 232 | else if( this->finish.action_code == Release_Schedule ) { |
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| 233 | unlock( this->finish.lock ); |
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| 234 | ScheduleThread( this->finish.thrd ); |
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| 235 | } |
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| 236 | else { |
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| 237 | assert(this->finish.action_code == No_Action); |
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[8fcbb4c] | 238 | } |
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[c84e80a] | 239 | } |
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| 240 | |
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[0c92c9f] | 241 | // Handles spinning logic |
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| 242 | // TODO : find some strategy to put cores to sleep after some time |
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[c84e80a] | 243 | void spin(processor * this, unsigned int * spin_count) { |
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| 244 | (*spin_count)++; |
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| 245 | } |
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| 246 | |
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[0c92c9f] | 247 | // Context invoker for processors |
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| 248 | // This is the entry point for processors (kernel threads) |
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| 249 | // It effectively constructs a coroutine by stealing the pthread stack |
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[8def349] | 250 | void * CtxInvokeProcessor(void * arg) { |
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| 251 | processor * proc = (processor *) arg; |
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| 252 | this_processor = proc; |
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| 253 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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| 254 | // which is needed for the 2-step context switch. However, there is no reason |
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| 255 | // to waste the perfectly valid stack create by pthread. |
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| 256 | current_stack_info_t info; |
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| 257 | machine_context_t ctx; |
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| 258 | info.context = &ctx; |
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| 259 | processorCtx_t proc_cor_storage = { proc, &info }; |
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| 260 | |
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[8fcbb4c] | 261 | LIB_DEBUG_PRINTF("Coroutine : created stack %p\n", proc_cor_storage.c.stack.base); |
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| 262 | |
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[0c92c9f] | 263 | //Set global state |
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[8fcbb4c] | 264 | proc->current_coroutine = &proc->runner->c; |
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[8def349] | 265 | proc->current_thread = NULL; |
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| 266 | |
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| 267 | //We now have a proper context from which to schedule threads |
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[8fcbb4c] | 268 | LIB_DEBUG_PRINTF("Kernel : core %p created (%p, %p)\n", proc, proc->runner, &ctx); |
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[8def349] | 269 | |
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| 270 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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| 271 | // resume it to start it like it normally would, it will just context switch |
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| 272 | // back to here. Instead directly call the main since we already are on the |
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| 273 | // appropriate stack. |
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| 274 | proc_cor_storage.c.state = Active; |
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| 275 | main( &proc_cor_storage ); |
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[ee897e4b] | 276 | proc_cor_storage.c.state = Halted; |
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[8def349] | 277 | |
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[0c92c9f] | 278 | // Main routine of the core returned, the core is now fully terminated |
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[8fcbb4c] | 279 | LIB_DEBUG_PRINTF("Kernel : core %p main ended (%p)\n", proc, proc->runner); |
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[8def349] | 280 | |
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| 281 | return NULL; |
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[c84e80a] | 282 | } |
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| 283 | |
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[8def349] | 284 | void start(processor * this) { |
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| 285 | LIB_DEBUG_PRINTF("Kernel : Starting core %p\n", this); |
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| 286 | |
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[8fcbb4c] | 287 | // pthread_attr_t attributes; |
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| 288 | // pthread_attr_init( &attributes ); |
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[eb2e723] | 289 | |
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[8fcbb4c] | 290 | pthread_create( &this->kernel_thread, NULL, CtxInvokeProcessor, (void*)this ); |
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[eb2e723] | 291 | |
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[8fcbb4c] | 292 | // pthread_attr_destroy( &attributes ); |
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[eb2e723] | 293 | |
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[8def349] | 294 | LIB_DEBUG_PRINTF("Kernel : core %p started\n", this); |
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[eb2e723] | 295 | } |
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| 296 | |
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[8def349] | 297 | //----------------------------------------------------------------------------- |
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| 298 | // Scheduler routines |
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[75f3522] | 299 | void ScheduleThread( thread * thrd ) { |
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[8def349] | 300 | assertf( thrd->next == NULL, "Expected null got %p", thrd->next ); |
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| 301 | |
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[db6f06a] | 302 | lock( &systemProcessor->cltr->lock ); |
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[8def349] | 303 | append( &systemProcessor->cltr->ready_queue, thrd ); |
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[db6f06a] | 304 | unlock( &systemProcessor->cltr->lock ); |
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| 305 | } |
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| 306 | |
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| 307 | thread * nextThread(cluster * this) { |
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| 308 | lock( &this->lock ); |
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| 309 | thread * head = pop_head( &this->ready_queue ); |
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| 310 | unlock( &this->lock ); |
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| 311 | return head; |
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[eb2e723] | 312 | } |
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| 313 | |
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[75f3522] | 314 | void ScheduleInternal() { |
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| 315 | suspend(); |
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| 316 | } |
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| 317 | |
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[db6f06a] | 318 | void ScheduleInternal( spinlock * lock ) { |
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| 319 | get_this_processor()->finish.action_code = Release; |
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| 320 | get_this_processor()->finish.lock = lock; |
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| 321 | suspend(); |
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| 322 | } |
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| 323 | |
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| 324 | void ScheduleInternal( thread * thrd ) { |
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| 325 | get_this_processor()->finish.action_code = Schedule; |
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| 326 | get_this_processor()->finish.thrd = thrd; |
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| 327 | suspend(); |
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| 328 | } |
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| 329 | |
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| 330 | void ScheduleInternal( spinlock * lock, thread * thrd ) { |
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| 331 | get_this_processor()->finish.action_code = Release_Schedule; |
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| 332 | get_this_processor()->finish.lock = lock; |
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| 333 | get_this_processor()->finish.thrd = thrd; |
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| 334 | suspend(); |
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[eb2e723] | 335 | } |
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| 336 | |
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| 337 | //----------------------------------------------------------------------------- |
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| 338 | // Kernel boot procedures |
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| 339 | void kernel_startup(void) { |
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| 340 | LIB_DEBUG_PRINTF("Kernel : Starting\n"); |
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| 341 | |
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| 342 | // Start by initializing the main thread |
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[8fcbb4c] | 343 | // SKULLDUGGERY: the mainThread steals the process main thread |
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| 344 | // which will then be scheduled by the systemProcessor normally |
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[e15df4c] | 345 | mainThread = (thread *)&mainThread_storage; |
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[8fcbb4c] | 346 | current_stack_info_t info; |
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[8def349] | 347 | mainThread{ &info }; |
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[eb2e723] | 348 | |
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[bd98b58] | 349 | // Initialize the system cluster |
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| 350 | systemCluster = (cluster *)&systemCluster_storage; |
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| 351 | systemCluster{}; |
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| 352 | |
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[8def349] | 353 | // Initialize the system processor and the system processor ctx |
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[eb2e723] | 354 | // (the coroutine that contains the processing control flow) |
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[8def349] | 355 | systemProcessor = (processor *)&systemProcessor_storage; |
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| 356 | systemProcessor{ systemCluster, (processorCtx_t *)&systemProcessorCtx_storage }; |
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[eb2e723] | 357 | |
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[dcb42b8] | 358 | // Add the main thread to the ready queue |
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| 359 | // once resume is called on systemProcessor->ctx the mainThread needs to be scheduled like any normal thread |
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[75f3522] | 360 | ScheduleThread(mainThread); |
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[eb2e723] | 361 | |
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[dcb42b8] | 362 | //initialize the global state variables |
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[bd98b58] | 363 | this_processor = systemProcessor; |
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| 364 | this_processor->current_thread = mainThread; |
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| 365 | this_processor->current_coroutine = &mainThread->c; |
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[eb2e723] | 366 | |
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[dcb42b8] | 367 | // SKULLDUGGERY: Force a context switch to the system processor to set the main thread's context to the current UNIX |
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| 368 | // context. Hence, the main thread does not begin through CtxInvokeThread, like all other threads. The trick here is that |
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| 369 | // mainThread is on the ready queue when this call is made. |
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[8fcbb4c] | 370 | resume(systemProcessor->runner); |
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[eb2e723] | 371 | |
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[dcb42b8] | 372 | |
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| 373 | |
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| 374 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
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[eb2e723] | 375 | LIB_DEBUG_PRINTF("Kernel : Started\n--------------------------------------------------\n\n"); |
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| 376 | } |
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| 377 | |
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[dcb42b8] | 378 | void kernel_shutdown(void) { |
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| 379 | LIB_DEBUG_PRINTF("\n--------------------------------------------------\nKernel : Shutting down\n"); |
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[eb2e723] | 380 | |
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[dcb42b8] | 381 | // SKULLDUGGERY: Notify the systemProcessor it needs to terminates. |
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| 382 | // When its coroutine terminates, it return control to the mainThread |
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| 383 | // which is currently here |
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[db6f06a] | 384 | systemProcessor->is_terminated = true; |
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[eb2e723] | 385 | suspend(); |
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| 386 | |
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[dcb42b8] | 387 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
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[eb2e723] | 388 | |
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[dcb42b8] | 389 | // Destroy the system processor and its context in reverse order of construction |
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| 390 | // These were manually constructed so we need manually destroy them |
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[8fcbb4c] | 391 | ^(systemProcessor->runner){}; |
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[eb2e723] | 392 | ^(systemProcessor){}; |
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| 393 | |
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[dcb42b8] | 394 | // Final step, destroy the main thread since it is no longer needed |
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| 395 | // Since we provided a stack to this taxk it will not destroy anything |
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[eb2e723] | 396 | ^(mainThread){}; |
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| 397 | |
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| 398 | LIB_DEBUG_PRINTF("Kernel : Shutdown complete\n"); |
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[8118303] | 399 | } |
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| 400 | |
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[bd98b58] | 401 | //----------------------------------------------------------------------------- |
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| 402 | // Locks |
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[db6f06a] | 403 | void ?{}( spinlock * this ) { |
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| 404 | this->lock = 0; |
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[bd98b58] | 405 | } |
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[db6f06a] | 406 | void ^?{}( spinlock * this ) { |
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[bd98b58] | 407 | |
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[db6f06a] | 408 | } |
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| 409 | |
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| 410 | void lock( spinlock * this ) { |
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| 411 | for ( unsigned int i = 1;; i += 1 ) { |
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| 412 | if ( this->lock == 0 && __sync_lock_test_and_set_4( &this->lock, 1 ) == 0 ) break; |
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| 413 | } |
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| 414 | } |
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[bd98b58] | 415 | |
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[db6f06a] | 416 | void unlock( spinlock * this ) { |
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| 417 | __sync_lock_release_4( &this->lock ); |
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[bd98b58] | 418 | } |
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| 419 | |
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[db6f06a] | 420 | void ?{}( signal_once * this ) { |
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| 421 | this->condition = false; |
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| 422 | } |
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| 423 | void ^?{}( signal_once * this ) { |
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| 424 | |
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| 425 | } |
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| 426 | |
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| 427 | void wait( signal_once * this ) { |
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| 428 | lock( &this->lock ); |
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| 429 | if( !this->condition ) { |
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[8def349] | 430 | append( &this->blocked, this_thread() ); |
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[db6f06a] | 431 | ScheduleInternal( &this->lock ); |
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| 432 | lock( &this->lock ); |
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[8def349] | 433 | } |
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[db6f06a] | 434 | unlock( &this->lock ); |
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[bd98b58] | 435 | } |
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| 436 | |
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[db6f06a] | 437 | void signal( signal_once * this ) { |
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| 438 | lock( &this->lock ); |
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| 439 | { |
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| 440 | this->condition = true; |
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| 441 | |
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| 442 | thread * it; |
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| 443 | while( it = pop_head( &this->blocked) ) { |
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| 444 | ScheduleThread( it ); |
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| 445 | } |
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[bd98b58] | 446 | } |
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[db6f06a] | 447 | unlock( &this->lock ); |
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[bd98b58] | 448 | } |
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| 449 | |
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| 450 | //----------------------------------------------------------------------------- |
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| 451 | // Queues |
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| 452 | void ?{}( simple_thread_list * this ) { |
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| 453 | this->head = NULL; |
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| 454 | this->tail = &this->head; |
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| 455 | } |
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| 456 | |
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[e15df4c] | 457 | void append( simple_thread_list * this, thread * t ) { |
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[bd98b58] | 458 | assert( t->next == NULL ); |
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| 459 | *this->tail = t; |
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| 460 | this->tail = &t->next; |
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| 461 | } |
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| 462 | |
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[e15df4c] | 463 | thread * pop_head( simple_thread_list * this ) { |
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| 464 | thread * head = this->head; |
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[bd98b58] | 465 | if( head ) { |
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| 466 | this->head = head->next; |
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| 467 | if( !head->next ) { |
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| 468 | this->tail = &this->head; |
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| 469 | } |
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| 470 | head->next = NULL; |
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| 471 | } |
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| 472 | |
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| 473 | return head; |
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| 474 | } |
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[8118303] | 475 | // Local Variables: // |
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| 476 | // mode: c // |
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| 477 | // tab-width: 4 // |
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| 478 | // End: // |
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