[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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[c3acb841] | 57 | coroutine_desc * this_coroutine(void) { |
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[bd98b58] | 58 | return this_processor->current_coroutine; |
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| 59 | } |
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| 60 | |
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[e15df4c] | 61 | thread * this_thread(void) { |
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[bd98b58] | 62 | return this_processor->current_thread; |
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[c84e80a] | 63 | } |
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| 64 | |
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| 65 | //----------------------------------------------------------------------------- |
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[8def349] | 66 | // Main thread construction |
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| 67 | struct current_stack_info_t { |
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| 68 | machine_context_t ctx; |
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| 69 | unsigned int size; // size of stack |
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| 70 | void *base; // base of stack |
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| 71 | void *storage; // pointer to stack |
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| 72 | void *limit; // stack grows towards stack limit |
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| 73 | void *context; // address of cfa_context_t |
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| 74 | void *top; // address of top of storage |
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[c84e80a] | 75 | }; |
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| 76 | |
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[8def349] | 77 | void ?{}( current_stack_info_t * this ) { |
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| 78 | CtxGet( &this->ctx ); |
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| 79 | this->base = this->ctx.FP; |
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| 80 | this->storage = this->ctx.SP; |
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| 81 | |
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| 82 | rlimit r; |
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[132fad4] | 83 | getrlimit( RLIMIT_STACK, &r); |
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[8def349] | 84 | this->size = r.rlim_cur; |
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| 85 | |
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| 86 | this->limit = (void *)(((intptr_t)this->base) - this->size); |
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| 87 | this->context = &mainThread_context_storage; |
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| 88 | this->top = this->base; |
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| 89 | } |
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| 90 | |
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| 91 | void ?{}( coStack_t * this, current_stack_info_t * info) { |
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| 92 | this->size = info->size; |
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| 93 | this->storage = info->storage; |
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| 94 | this->limit = info->limit; |
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| 95 | this->base = info->base; |
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| 96 | this->context = info->context; |
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| 97 | this->top = info->top; |
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| 98 | this->userStack = true; |
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| 99 | } |
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| 100 | |
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[c3acb841] | 101 | void ?{}( coroutine_desc * this, current_stack_info_t * info) { |
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[8def349] | 102 | (&this->stack){ info }; |
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| 103 | this->name = "Main Thread"; |
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| 104 | this->errno_ = 0; |
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[ee897e4b] | 105 | this->state = Start; |
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[8def349] | 106 | } |
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| 107 | |
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[e15df4c] | 108 | void ?{}( thread * this, current_stack_info_t * info) { |
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[8def349] | 109 | (&this->c){ info }; |
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| 110 | } |
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[c84e80a] | 111 | |
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[8def349] | 112 | //----------------------------------------------------------------------------- |
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| 113 | // Processor coroutine |
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[eb2e723] | 114 | void ?{}(processorCtx_t * this, processor * proc) { |
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| 115 | (&this->c){}; |
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[c84e80a] | 116 | this->proc = proc; |
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[8fcbb4c] | 117 | proc->runner = this; |
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[8def349] | 118 | } |
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| 119 | |
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| 120 | void ?{}(processorCtx_t * this, processor * proc, current_stack_info_t * info) { |
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| 121 | (&this->c){ info }; |
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| 122 | this->proc = proc; |
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[8fcbb4c] | 123 | proc->runner = this; |
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[8def349] | 124 | } |
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| 125 | |
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| 126 | void ?{}(processor * this) { |
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| 127 | this{ systemCluster }; |
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| 128 | } |
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| 129 | |
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| 130 | void ?{}(processor * this, cluster * cltr) { |
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| 131 | this->cltr = cltr; |
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| 132 | this->current_coroutine = NULL; |
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| 133 | this->current_thread = NULL; |
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[db6f06a] | 134 | (&this->terminated){}; |
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| 135 | this->is_terminated = false; |
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[8def349] | 136 | |
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| 137 | start( this ); |
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[c84e80a] | 138 | } |
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| 139 | |
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[8fcbb4c] | 140 | void ?{}(processor * this, cluster * cltr, processorCtx_t * runner) { |
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[8def349] | 141 | this->cltr = cltr; |
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| 142 | this->current_coroutine = NULL; |
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| 143 | this->current_thread = NULL; |
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[db6f06a] | 144 | (&this->terminated){}; |
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| 145 | this->is_terminated = false; |
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[8def349] | 146 | |
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[8fcbb4c] | 147 | this->runner = runner; |
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| 148 | LIB_DEBUG_PRINTF("Kernel : constructing processor context %p\n", runner); |
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| 149 | runner{ this }; |
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[8def349] | 150 | } |
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| 151 | |
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| 152 | void ^?{}(processor * this) { |
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[db6f06a] | 153 | if( ! this->is_terminated ) { |
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[8def349] | 154 | LIB_DEBUG_PRINTF("Kernel : core %p signaling termination\n", this); |
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[db6f06a] | 155 | this->is_terminated = true; |
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| 156 | wait( &this->terminated ); |
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[8def349] | 157 | } |
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| 158 | } |
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| 159 | |
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| 160 | void ?{}(cluster * this) { |
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| 161 | ( &this->ready_queue ){}; |
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[eafb094] | 162 | ( &this->lock ){}; |
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[8def349] | 163 | } |
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| 164 | |
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| 165 | void ^?{}(cluster * this) { |
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[8fcbb4c] | 166 | |
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[c84e80a] | 167 | } |
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| 168 | |
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[75f3522] | 169 | //============================================================================================= |
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| 170 | // Kernel Scheduling logic |
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| 171 | //============================================================================================= |
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[8fcbb4c] | 172 | //Main of the processor contexts |
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| 173 | void main(processorCtx_t * runner) { |
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| 174 | processor * this = runner->proc; |
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[eb2e723] | 175 | LIB_DEBUG_PRINTF("Kernel : core %p starting\n", this); |
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[8118303] | 176 | |
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[e15df4c] | 177 | thread * readyThread = NULL; |
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[db6f06a] | 178 | for( unsigned int spin_count = 0; ! this->is_terminated; spin_count++ ) |
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[75f3522] | 179 | { |
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[bd98b58] | 180 | readyThread = nextThread( this->cltr ); |
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[8118303] | 181 | |
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[75f3522] | 182 | if(readyThread) |
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| 183 | { |
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| 184 | runThread(this, readyThread); |
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| 185 | |
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| 186 | //Some actions need to be taken from the kernel |
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[db6f06a] | 187 | finishRunning(this); |
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[75f3522] | 188 | |
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[c84e80a] | 189 | spin_count = 0; |
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[75f3522] | 190 | } |
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| 191 | else |
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| 192 | { |
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[c84e80a] | 193 | spin(this, &spin_count); |
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| 194 | } |
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| 195 | } |
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[8118303] | 196 | |
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[8def349] | 197 | LIB_DEBUG_PRINTF("Kernel : core %p unlocking thread\n", this); |
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[db6f06a] | 198 | signal( &this->terminated ); |
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[c84e80a] | 199 | LIB_DEBUG_PRINTF("Kernel : core %p terminated\n", this); |
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| 200 | } |
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| 201 | |
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[75f3522] | 202 | // runThread runs a thread by context switching |
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[0c92c9f] | 203 | // from the processor coroutine to the target thread |
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[75f3522] | 204 | void runThread(processor * this, thread * dst) { |
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[c3acb841] | 205 | coroutine_desc * proc_cor = get_coroutine(this->runner); |
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| 206 | coroutine_desc * thrd_cor = get_coroutine(dst); |
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[75f3522] | 207 | |
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| 208 | //Reset the terminating actions here |
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[db6f06a] | 209 | this->finish.action_code = No_Action; |
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[8fcbb4c] | 210 | |
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[75f3522] | 211 | //Update global state |
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| 212 | this->current_thread = dst; |
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| 213 | |
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| 214 | // Context Switch to the thread |
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| 215 | ThreadCtxSwitch(proc_cor, thrd_cor); |
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| 216 | // when ThreadCtxSwitch returns we are back in the processor coroutine |
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| 217 | } |
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| 218 | |
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| 219 | // Once a thread has finished running, some of |
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| 220 | // its final actions must be executed from the kernel |
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[db6f06a] | 221 | void finishRunning(processor * this) { |
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| 222 | if( this->finish.action_code == Release ) { |
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| 223 | unlock( this->finish.lock ); |
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| 224 | } |
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| 225 | else if( this->finish.action_code == Schedule ) { |
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| 226 | ScheduleThread( this->finish.thrd ); |
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| 227 | } |
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| 228 | else if( this->finish.action_code == Release_Schedule ) { |
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| 229 | unlock( this->finish.lock ); |
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| 230 | ScheduleThread( this->finish.thrd ); |
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| 231 | } |
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| 232 | else { |
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| 233 | assert(this->finish.action_code == No_Action); |
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[8fcbb4c] | 234 | } |
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[c84e80a] | 235 | } |
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| 236 | |
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[0c92c9f] | 237 | // Handles spinning logic |
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| 238 | // TODO : find some strategy to put cores to sleep after some time |
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[c84e80a] | 239 | void spin(processor * this, unsigned int * spin_count) { |
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| 240 | (*spin_count)++; |
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| 241 | } |
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| 242 | |
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[0c92c9f] | 243 | // Context invoker for processors |
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| 244 | // This is the entry point for processors (kernel threads) |
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| 245 | // It effectively constructs a coroutine by stealing the pthread stack |
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[8def349] | 246 | void * CtxInvokeProcessor(void * arg) { |
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| 247 | processor * proc = (processor *) arg; |
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| 248 | this_processor = proc; |
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| 249 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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| 250 | // which is needed for the 2-step context switch. However, there is no reason |
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| 251 | // to waste the perfectly valid stack create by pthread. |
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| 252 | current_stack_info_t info; |
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| 253 | machine_context_t ctx; |
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| 254 | info.context = &ctx; |
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| 255 | processorCtx_t proc_cor_storage = { proc, &info }; |
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| 256 | |
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[8fcbb4c] | 257 | LIB_DEBUG_PRINTF("Coroutine : created stack %p\n", proc_cor_storage.c.stack.base); |
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| 258 | |
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[0c92c9f] | 259 | //Set global state |
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[8fcbb4c] | 260 | proc->current_coroutine = &proc->runner->c; |
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[8def349] | 261 | proc->current_thread = NULL; |
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| 262 | |
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| 263 | //We now have a proper context from which to schedule threads |
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[8fcbb4c] | 264 | LIB_DEBUG_PRINTF("Kernel : core %p created (%p, %p)\n", proc, proc->runner, &ctx); |
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[8def349] | 265 | |
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| 266 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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| 267 | // resume it to start it like it normally would, it will just context switch |
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| 268 | // back to here. Instead directly call the main since we already are on the |
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| 269 | // appropriate stack. |
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| 270 | proc_cor_storage.c.state = Active; |
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| 271 | main( &proc_cor_storage ); |
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[ee897e4b] | 272 | proc_cor_storage.c.state = Halted; |
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[8def349] | 273 | |
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[0c92c9f] | 274 | // Main routine of the core returned, the core is now fully terminated |
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[8fcbb4c] | 275 | LIB_DEBUG_PRINTF("Kernel : core %p main ended (%p)\n", proc, proc->runner); |
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[8def349] | 276 | |
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| 277 | return NULL; |
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[c84e80a] | 278 | } |
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| 279 | |
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[8def349] | 280 | void start(processor * this) { |
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| 281 | LIB_DEBUG_PRINTF("Kernel : Starting core %p\n", this); |
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| 282 | |
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[8fcbb4c] | 283 | // pthread_attr_t attributes; |
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| 284 | // pthread_attr_init( &attributes ); |
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[eb2e723] | 285 | |
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[8fcbb4c] | 286 | pthread_create( &this->kernel_thread, NULL, CtxInvokeProcessor, (void*)this ); |
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[eb2e723] | 287 | |
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[8fcbb4c] | 288 | // pthread_attr_destroy( &attributes ); |
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[eb2e723] | 289 | |
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[8def349] | 290 | LIB_DEBUG_PRINTF("Kernel : core %p started\n", this); |
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[eb2e723] | 291 | } |
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| 292 | |
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[8def349] | 293 | //----------------------------------------------------------------------------- |
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| 294 | // Scheduler routines |
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[75f3522] | 295 | void ScheduleThread( thread * thrd ) { |
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[8def349] | 296 | assertf( thrd->next == NULL, "Expected null got %p", thrd->next ); |
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| 297 | |
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[db6f06a] | 298 | lock( &systemProcessor->cltr->lock ); |
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[8def349] | 299 | append( &systemProcessor->cltr->ready_queue, thrd ); |
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[db6f06a] | 300 | unlock( &systemProcessor->cltr->lock ); |
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| 301 | } |
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| 302 | |
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| 303 | thread * nextThread(cluster * this) { |
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| 304 | lock( &this->lock ); |
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| 305 | thread * head = pop_head( &this->ready_queue ); |
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| 306 | unlock( &this->lock ); |
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| 307 | return head; |
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[eb2e723] | 308 | } |
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| 309 | |
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[75f3522] | 310 | void ScheduleInternal() { |
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| 311 | suspend(); |
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| 312 | } |
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| 313 | |
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[db6f06a] | 314 | void ScheduleInternal( spinlock * lock ) { |
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[89a3df5] | 315 | this_processor->finish.action_code = Release; |
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| 316 | this_processor->finish.lock = lock; |
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[db6f06a] | 317 | suspend(); |
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| 318 | } |
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| 319 | |
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| 320 | void ScheduleInternal( thread * thrd ) { |
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[89a3df5] | 321 | this_processor->finish.action_code = Schedule; |
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| 322 | this_processor->finish.thrd = thrd; |
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[db6f06a] | 323 | suspend(); |
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| 324 | } |
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| 325 | |
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| 326 | void ScheduleInternal( spinlock * lock, thread * thrd ) { |
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[89a3df5] | 327 | this_processor->finish.action_code = Release_Schedule; |
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| 328 | this_processor->finish.lock = lock; |
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| 329 | this_processor->finish.thrd = thrd; |
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[db6f06a] | 330 | suspend(); |
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[eb2e723] | 331 | } |
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| 332 | |
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| 333 | //----------------------------------------------------------------------------- |
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| 334 | // Kernel boot procedures |
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| 335 | void kernel_startup(void) { |
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| 336 | LIB_DEBUG_PRINTF("Kernel : Starting\n"); |
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| 337 | |
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| 338 | // Start by initializing the main thread |
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[8fcbb4c] | 339 | // SKULLDUGGERY: the mainThread steals the process main thread |
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| 340 | // which will then be scheduled by the systemProcessor normally |
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[e15df4c] | 341 | mainThread = (thread *)&mainThread_storage; |
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[8fcbb4c] | 342 | current_stack_info_t info; |
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[8def349] | 343 | mainThread{ &info }; |
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[eb2e723] | 344 | |
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[bd98b58] | 345 | // Initialize the system cluster |
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| 346 | systemCluster = (cluster *)&systemCluster_storage; |
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| 347 | systemCluster{}; |
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| 348 | |
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[8def349] | 349 | // Initialize the system processor and the system processor ctx |
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[eb2e723] | 350 | // (the coroutine that contains the processing control flow) |
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[8def349] | 351 | systemProcessor = (processor *)&systemProcessor_storage; |
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| 352 | systemProcessor{ systemCluster, (processorCtx_t *)&systemProcessorCtx_storage }; |
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[eb2e723] | 353 | |
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[dcb42b8] | 354 | // Add the main thread to the ready queue |
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| 355 | // once resume is called on systemProcessor->ctx the mainThread needs to be scheduled like any normal thread |
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[75f3522] | 356 | ScheduleThread(mainThread); |
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[eb2e723] | 357 | |
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[dcb42b8] | 358 | //initialize the global state variables |
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[bd98b58] | 359 | this_processor = systemProcessor; |
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| 360 | this_processor->current_thread = mainThread; |
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| 361 | this_processor->current_coroutine = &mainThread->c; |
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[eb2e723] | 362 | |
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[dcb42b8] | 363 | // SKULLDUGGERY: Force a context switch to the system processor to set the main thread's context to the current UNIX |
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| 364 | // context. Hence, the main thread does not begin through CtxInvokeThread, like all other threads. The trick here is that |
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| 365 | // mainThread is on the ready queue when this call is made. |
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[8fcbb4c] | 366 | resume(systemProcessor->runner); |
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[eb2e723] | 367 | |
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[dcb42b8] | 368 | |
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| 369 | |
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| 370 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
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[eb2e723] | 371 | LIB_DEBUG_PRINTF("Kernel : Started\n--------------------------------------------------\n\n"); |
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| 372 | } |
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| 373 | |
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[dcb42b8] | 374 | void kernel_shutdown(void) { |
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| 375 | LIB_DEBUG_PRINTF("\n--------------------------------------------------\nKernel : Shutting down\n"); |
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[eb2e723] | 376 | |
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[dcb42b8] | 377 | // SKULLDUGGERY: Notify the systemProcessor it needs to terminates. |
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| 378 | // When its coroutine terminates, it return control to the mainThread |
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| 379 | // which is currently here |
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[db6f06a] | 380 | systemProcessor->is_terminated = true; |
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[eb2e723] | 381 | suspend(); |
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| 382 | |
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[dcb42b8] | 383 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
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[eb2e723] | 384 | |
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[dcb42b8] | 385 | // Destroy the system processor and its context in reverse order of construction |
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| 386 | // These were manually constructed so we need manually destroy them |
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[8fcbb4c] | 387 | ^(systemProcessor->runner){}; |
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[eb2e723] | 388 | ^(systemProcessor){}; |
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| 389 | |
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[dcb42b8] | 390 | // Final step, destroy the main thread since it is no longer needed |
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| 391 | // Since we provided a stack to this taxk it will not destroy anything |
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[eb2e723] | 392 | ^(mainThread){}; |
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| 393 | |
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| 394 | LIB_DEBUG_PRINTF("Kernel : Shutdown complete\n"); |
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[8118303] | 395 | } |
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| 396 | |
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[bd98b58] | 397 | //----------------------------------------------------------------------------- |
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| 398 | // Locks |
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[db6f06a] | 399 | void ?{}( spinlock * this ) { |
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| 400 | this->lock = 0; |
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[bd98b58] | 401 | } |
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[db6f06a] | 402 | void ^?{}( spinlock * this ) { |
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[bd98b58] | 403 | |
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[db6f06a] | 404 | } |
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| 405 | |
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| 406 | void lock( spinlock * this ) { |
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| 407 | for ( unsigned int i = 1;; i += 1 ) { |
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| 408 | if ( this->lock == 0 && __sync_lock_test_and_set_4( &this->lock, 1 ) == 0 ) break; |
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| 409 | } |
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| 410 | } |
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[bd98b58] | 411 | |
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[db6f06a] | 412 | void unlock( spinlock * this ) { |
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| 413 | __sync_lock_release_4( &this->lock ); |
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[bd98b58] | 414 | } |
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| 415 | |
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[db6f06a] | 416 | void ?{}( signal_once * this ) { |
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| 417 | this->condition = false; |
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| 418 | } |
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| 419 | void ^?{}( signal_once * this ) { |
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| 420 | |
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| 421 | } |
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| 422 | |
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| 423 | void wait( signal_once * this ) { |
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| 424 | lock( &this->lock ); |
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| 425 | if( !this->condition ) { |
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[8def349] | 426 | append( &this->blocked, this_thread() ); |
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[db6f06a] | 427 | ScheduleInternal( &this->lock ); |
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| 428 | lock( &this->lock ); |
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[8def349] | 429 | } |
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[db6f06a] | 430 | unlock( &this->lock ); |
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[bd98b58] | 431 | } |
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| 432 | |
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[db6f06a] | 433 | void signal( signal_once * this ) { |
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| 434 | lock( &this->lock ); |
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| 435 | { |
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| 436 | this->condition = true; |
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| 437 | |
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| 438 | thread * it; |
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| 439 | while( it = pop_head( &this->blocked) ) { |
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| 440 | ScheduleThread( it ); |
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| 441 | } |
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[bd98b58] | 442 | } |
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[db6f06a] | 443 | unlock( &this->lock ); |
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[bd98b58] | 444 | } |
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| 445 | |
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| 446 | //----------------------------------------------------------------------------- |
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| 447 | // Queues |
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| 448 | void ?{}( simple_thread_list * this ) { |
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| 449 | this->head = NULL; |
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| 450 | this->tail = &this->head; |
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| 451 | } |
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| 452 | |
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[e15df4c] | 453 | void append( simple_thread_list * this, thread * t ) { |
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[f07e037] | 454 | assert(this->tail != NULL); |
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[bd98b58] | 455 | *this->tail = t; |
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| 456 | this->tail = &t->next; |
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| 457 | } |
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| 458 | |
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[e15df4c] | 459 | thread * pop_head( simple_thread_list * this ) { |
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| 460 | thread * head = this->head; |
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[bd98b58] | 461 | if( head ) { |
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| 462 | this->head = head->next; |
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| 463 | if( !head->next ) { |
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| 464 | this->tail = &this->head; |
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| 465 | } |
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| 466 | head->next = NULL; |
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| 467 | } |
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| 468 | return head; |
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| 469 | } |
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[8118303] | 470 | // Local Variables: // |
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| 471 | // mode: c // |
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| 472 | // tab-width: 4 // |
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| 473 | // End: // |
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