[8118303] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // kernel.c -- |
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| 8 | // |
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| 9 | // Author : Thierry Delisle |
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[75f3522] | 10 | // Created On : Tue Jan 17 12:27:26 2017 |
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[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
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[381fdee] | 12 | // Last Modified On : Thu Feb 8 23:52:19 2018 |
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| 13 | // Update Count : 5 |
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[8118303] | 14 | // |
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| 15 | |
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| 16 | //C Includes |
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[c84e80a] | 17 | #include <stddef.h> |
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[eb2e723] | 18 | extern "C" { |
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[9d944b2] | 19 | #include <stdio.h> |
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[8fcbb4c] | 20 | #include <fenv.h> |
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[eb2e723] | 21 | #include <sys/resource.h> |
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[9d944b2] | 22 | #include <signal.h> |
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| 23 | #include <unistd.h> |
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[eb2e723] | 24 | } |
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[8118303] | 25 | |
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| 26 | //CFA Includes |
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[2ac095d] | 27 | #include "kernel_private.h" |
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[c81ebf9] | 28 | #include "preemption.h" |
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[2ac095d] | 29 | #include "startup.h" |
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[8118303] | 30 | |
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| 31 | //Private includes |
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| 32 | #define __CFA_INVOKE_PRIVATE__ |
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| 33 | #include "invoke.h" |
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| 34 | |
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[2ac095d] | 35 | //Start and stop routine for the kernel, declared first to make sure they run first |
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| 36 | void kernel_startup(void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) )); |
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| 37 | void kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) )); |
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| 38 | |
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[8def349] | 39 | //----------------------------------------------------------------------------- |
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| 40 | // Kernel storage |
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[969b3fe] | 41 | KERNEL_STORAGE(cluster, mainCluster); |
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| 42 | KERNEL_STORAGE(processor, mainProcessor); |
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| 43 | KERNEL_STORAGE(processorCtx_t, mainProcessorCtx); |
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| 44 | KERNEL_STORAGE(thread_desc, mainThread); |
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[f2b12406] | 45 | KERNEL_STORAGE(machine_context_t, mainThreadCtx); |
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[8def349] | 46 | |
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[969b3fe] | 47 | cluster * mainCluster; |
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| 48 | processor * mainProcessor; |
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[348006f] | 49 | thread_desc * mainThread; |
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[eb2e723] | 50 | |
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[bd98b58] | 51 | //----------------------------------------------------------------------------- |
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| 52 | // Global state |
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| 53 | |
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[9cc0472] | 54 | thread_local coroutine_desc * volatile this_coroutine; |
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| 55 | thread_local thread_desc * volatile this_thread; |
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| 56 | thread_local processor * volatile this_processor; |
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[969b3fe] | 57 | |
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[b69ea6b] | 58 | // volatile thread_local bool preemption_in_progress = 0; |
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| 59 | // volatile thread_local bool preemption_enabled = false; |
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| 60 | // volatile thread_local unsigned short disable_preempt_count = 1; |
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| 61 | |
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[d8548e2] | 62 | volatile thread_local __cfa_kernel_preemption_state_t preemption_state = { false, false, 1 }; |
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[c84e80a] | 63 | |
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| 64 | //----------------------------------------------------------------------------- |
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[8def349] | 65 | // Main thread construction |
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| 66 | struct current_stack_info_t { |
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[1c273d0] | 67 | machine_context_t ctx; |
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[8def349] | 68 | unsigned int size; // size of stack |
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| 69 | void *base; // base of stack |
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| 70 | void *storage; // pointer to stack |
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| 71 | void *limit; // stack grows towards stack limit |
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| 72 | void *context; // address of cfa_context_t |
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| 73 | void *top; // address of top of storage |
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[c84e80a] | 74 | }; |
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| 75 | |
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[242a902] | 76 | void ?{}( current_stack_info_t & this ) { |
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| 77 | CtxGet( this.ctx ); |
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| 78 | this.base = this.ctx.FP; |
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| 79 | this.storage = this.ctx.SP; |
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[8def349] | 80 | |
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| 81 | rlimit r; |
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[132fad4] | 82 | getrlimit( RLIMIT_STACK, &r); |
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[242a902] | 83 | this.size = r.rlim_cur; |
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[8def349] | 84 | |
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[242a902] | 85 | this.limit = (void *)(((intptr_t)this.base) - this.size); |
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[9236060] | 86 | this.context = &storage_mainThreadCtx; |
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[242a902] | 87 | this.top = this.base; |
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[8def349] | 88 | } |
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| 89 | |
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[65deb18] | 90 | void ?{}( coStack_t & this, current_stack_info_t * info) with( this ) { |
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| 91 | size = info->size; |
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| 92 | storage = info->storage; |
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| 93 | limit = info->limit; |
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| 94 | base = info->base; |
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| 95 | context = info->context; |
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| 96 | top = info->top; |
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| 97 | userStack = true; |
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[8def349] | 98 | } |
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| 99 | |
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[65deb18] | 100 | void ?{}( coroutine_desc & this, current_stack_info_t * info) with( this ) { |
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| 101 | stack{ info }; |
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| 102 | name = "Main Thread"; |
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| 103 | errno_ = 0; |
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| 104 | state = Start; |
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| 105 | starter = NULL; |
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[8def349] | 106 | } |
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| 107 | |
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[65deb18] | 108 | void ?{}( thread_desc & this, current_stack_info_t * info) with( this ) { |
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| 109 | self_cor{ info }; |
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[82c948c] | 110 | curr_cor = &self_cor; |
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| 111 | self_mon.owner = &this; |
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| 112 | self_mon.recursion = 1; |
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| 113 | self_mon_p = &self_mon; |
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| 114 | next = NULL; |
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| 115 | __cfaabi_dbg_debug_do( |
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| 116 | dbg_next = NULL; |
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| 117 | dbg_prev = NULL; |
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| 118 | __cfaabi_dbg_thread_register(&this); |
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| 119 | ) |
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| 120 | |
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| 121 | monitors{ &self_mon_p, 1, (fptr_t)0 }; |
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[8def349] | 122 | } |
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[c84e80a] | 123 | |
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[8def349] | 124 | //----------------------------------------------------------------------------- |
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| 125 | // Processor coroutine |
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[094476d] | 126 | void ?{}(processorCtx_t & this) {} |
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[39fea2f] | 127 | |
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| 128 | // Construct the processor context of the main processor |
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[242a902] | 129 | void ?{}(processorCtx_t & this, processor * proc) { |
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| 130 | (this.__cor){ "Processor" }; |
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[b462670] | 131 | this.__cor.starter = NULL; |
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[242a902] | 132 | this.proc = proc; |
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[8def349] | 133 | } |
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| 134 | |
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[39fea2f] | 135 | // Construct the processor context of non-main processors |
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[242a902] | 136 | void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) { |
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| 137 | (this.__cor){ info }; |
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| 138 | this.proc = proc; |
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[8def349] | 139 | } |
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| 140 | |
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[242a902] | 141 | void ?{}(processor & this) { |
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[969b3fe] | 142 | this{ mainCluster }; |
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[8def349] | 143 | } |
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| 144 | |
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[c40e7c5] | 145 | void ?{}(processor & this, cluster * cltr) with( this ) { |
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[242a902] | 146 | this.cltr = cltr; |
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[c40e7c5] | 147 | terminated{ 0 }; |
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| 148 | do_terminate = false; |
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| 149 | preemption_alarm = NULL; |
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| 150 | pending_preemption = false; |
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[094476d] | 151 | runner.proc = &this; |
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[8def349] | 152 | |
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[242a902] | 153 | start( &this ); |
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[c84e80a] | 154 | } |
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| 155 | |
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[c40e7c5] | 156 | void ?{}(processor & this, cluster * cltr, processorCtx_t & runner) with( this ) { |
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[242a902] | 157 | this.cltr = cltr; |
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[c40e7c5] | 158 | terminated{ 0 }; |
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| 159 | do_terminate = false; |
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| 160 | preemption_alarm = NULL; |
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| 161 | pending_preemption = false; |
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| 162 | kernel_thread = pthread_self(); |
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[094476d] | 163 | runner.proc = &this; |
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[8def349] | 164 | |
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[36982fc] | 165 | __cfaabi_dbg_print_safe("Kernel : constructing main processor context %p\n", &runner); |
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[83a071f9] | 166 | runner{ &this }; |
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[8def349] | 167 | } |
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| 168 | |
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[65deb18] | 169 | void ^?{}(processor & this) with( this ){ |
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| 170 | if( ! do_terminate ) { |
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[36982fc] | 171 | __cfaabi_dbg_print_safe("Kernel : core %p signaling termination\n", &this); |
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[4dad189] | 172 | terminate(&this); |
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[1f37ed02] | 173 | verify(this.do_terminate); |
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| 174 | verify(this_processor != &this); |
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[65deb18] | 175 | P( terminated ); |
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[1f37ed02] | 176 | verify(this_processor != &this); |
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[65deb18] | 177 | pthread_join( kernel_thread, NULL ); |
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[8def349] | 178 | } |
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| 179 | } |
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| 180 | |
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[65deb18] | 181 | void ?{}(cluster & this) with( this ) { |
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| 182 | ready_queue{}; |
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| 183 | ready_queue_lock{}; |
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[e60e0dc] | 184 | |
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[d8548e2] | 185 | preemption_rate = default_preemption(); |
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[8def349] | 186 | } |
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| 187 | |
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[242a902] | 188 | void ^?{}(cluster & this) { |
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[1c273d0] | 189 | |
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[c84e80a] | 190 | } |
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| 191 | |
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[75f3522] | 192 | //============================================================================================= |
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| 193 | // Kernel Scheduling logic |
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| 194 | //============================================================================================= |
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[8fcbb4c] | 195 | //Main of the processor contexts |
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[83a071f9] | 196 | void main(processorCtx_t & runner) { |
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| 197 | processor * this = runner.proc; |
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[094476d] | 198 | verify(this); |
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[c81ebf9] | 199 | |
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[36982fc] | 200 | __cfaabi_dbg_print_safe("Kernel : core %p starting\n", this); |
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[8118303] | 201 | |
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[75f3522] | 202 | { |
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[c81ebf9] | 203 | // Setup preemption data |
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| 204 | preemption_scope scope = { this }; |
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| 205 | |
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[36982fc] | 206 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
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[8118303] | 207 | |
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[c81ebf9] | 208 | thread_desc * readyThread = NULL; |
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[e60e0dc] | 209 | for( unsigned int spin_count = 0; ! this->do_terminate; spin_count++ ) |
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[75f3522] | 210 | { |
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[c81ebf9] | 211 | readyThread = nextThread( this->cltr ); |
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[75f3522] | 212 | |
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[c81ebf9] | 213 | if(readyThread) |
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| 214 | { |
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[d8548e2] | 215 | verify( !preemption_state.enabled ); |
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[4e6fb8e] | 216 | |
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[c81ebf9] | 217 | runThread(this, readyThread); |
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[75f3522] | 218 | |
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[d8548e2] | 219 | verify( !preemption_state.enabled ); |
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[4e6fb8e] | 220 | |
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[c81ebf9] | 221 | //Some actions need to be taken from the kernel |
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| 222 | finishRunning(this); |
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| 223 | |
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| 224 | spin_count = 0; |
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| 225 | } |
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| 226 | else |
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| 227 | { |
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| 228 | spin(this, &spin_count); |
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| 229 | } |
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| 230 | } |
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| 231 | |
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[36982fc] | 232 | __cfaabi_dbg_print_safe("Kernel : core %p stopping\n", this); |
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[c84e80a] | 233 | } |
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[8118303] | 234 | |
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[4cedd9f] | 235 | V( this->terminated ); |
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[bdeba0b] | 236 | |
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[36982fc] | 237 | __cfaabi_dbg_print_safe("Kernel : core %p terminated\n", this); |
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[c84e80a] | 238 | } |
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| 239 | |
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[1c273d0] | 240 | // runThread runs a thread by context switching |
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| 241 | // from the processor coroutine to the target thread |
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[348006f] | 242 | void runThread(processor * this, thread_desc * dst) { |
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[82c948c] | 243 | assert(dst->curr_cor); |
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[094476d] | 244 | coroutine_desc * proc_cor = get_coroutine(this->runner); |
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[82c948c] | 245 | coroutine_desc * thrd_cor = dst->curr_cor; |
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[1c273d0] | 246 | |
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[75f3522] | 247 | //Reset the terminating actions here |
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[db6f06a] | 248 | this->finish.action_code = No_Action; |
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[8fcbb4c] | 249 | |
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[75f3522] | 250 | //Update global state |
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[1c273d0] | 251 | this_thread = dst; |
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[75f3522] | 252 | |
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| 253 | // Context Switch to the thread |
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| 254 | ThreadCtxSwitch(proc_cor, thrd_cor); |
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| 255 | // when ThreadCtxSwitch returns we are back in the processor coroutine |
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| 256 | } |
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| 257 | |
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[82c948c] | 258 | void returnToKernel() { |
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[094476d] | 259 | coroutine_desc * proc_cor = get_coroutine(this_processor->runner); |
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[82c948c] | 260 | coroutine_desc * thrd_cor = this_thread->curr_cor = this_coroutine; |
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| 261 | ThreadCtxSwitch(thrd_cor, proc_cor); |
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| 262 | } |
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| 263 | |
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[1c273d0] | 264 | // Once a thread has finished running, some of |
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[75f3522] | 265 | // its final actions must be executed from the kernel |
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[65deb18] | 266 | void finishRunning(processor * this) with( this->finish ) { |
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| 267 | if( action_code == Release ) { |
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[d8548e2] | 268 | verify( !preemption_state.enabled ); |
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[65deb18] | 269 | unlock( *lock ); |
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[db6f06a] | 270 | } |
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[65deb18] | 271 | else if( action_code == Schedule ) { |
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| 272 | ScheduleThread( thrd ); |
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[db6f06a] | 273 | } |
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[65deb18] | 274 | else if( action_code == Release_Schedule ) { |
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[d8548e2] | 275 | verify( !preemption_state.enabled ); |
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[65deb18] | 276 | unlock( *lock ); |
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| 277 | ScheduleThread( thrd ); |
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[db6f06a] | 278 | } |
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[65deb18] | 279 | else if( action_code == Release_Multi ) { |
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[d8548e2] | 280 | verify( !preemption_state.enabled ); |
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[65deb18] | 281 | for(int i = 0; i < lock_count; i++) { |
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| 282 | unlock( *locks[i] ); |
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[0c78741] | 283 | } |
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| 284 | } |
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[65deb18] | 285 | else if( action_code == Release_Multi_Schedule ) { |
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| 286 | for(int i = 0; i < lock_count; i++) { |
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| 287 | unlock( *locks[i] ); |
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[0c78741] | 288 | } |
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[65deb18] | 289 | for(int i = 0; i < thrd_count; i++) { |
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| 290 | ScheduleThread( thrds[i] ); |
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[0c78741] | 291 | } |
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| 292 | } |
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[db6f06a] | 293 | else { |
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[65deb18] | 294 | assert(action_code == No_Action); |
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[8fcbb4c] | 295 | } |
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[c84e80a] | 296 | } |
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| 297 | |
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[0c92c9f] | 298 | // Handles spinning logic |
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| 299 | // TODO : find some strategy to put cores to sleep after some time |
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[c84e80a] | 300 | void spin(processor * this, unsigned int * spin_count) { |
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| 301 | (*spin_count)++; |
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| 302 | } |
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| 303 | |
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[0c92c9f] | 304 | // Context invoker for processors |
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| 305 | // This is the entry point for processors (kernel threads) |
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| 306 | // It effectively constructs a coroutine by stealing the pthread stack |
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[8def349] | 307 | void * CtxInvokeProcessor(void * arg) { |
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| 308 | processor * proc = (processor *) arg; |
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| 309 | this_processor = proc; |
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[1c273d0] | 310 | this_coroutine = NULL; |
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| 311 | this_thread = NULL; |
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[d8548e2] | 312 | preemption_state.enabled = false; |
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| 313 | preemption_state.disable_count = 1; |
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[8def349] | 314 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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| 315 | // which is needed for the 2-step context switch. However, there is no reason |
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[1c273d0] | 316 | // to waste the perfectly valid stack create by pthread. |
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[8def349] | 317 | current_stack_info_t info; |
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| 318 | machine_context_t ctx; |
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| 319 | info.context = &ctx; |
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[094476d] | 320 | (proc->runner){ proc, &info }; |
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[8def349] | 321 | |
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[094476d] | 322 | __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.base); |
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[8fcbb4c] | 323 | |
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[0c92c9f] | 324 | //Set global state |
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[094476d] | 325 | this_coroutine = get_coroutine(proc->runner); |
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[1c273d0] | 326 | this_thread = NULL; |
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[8def349] | 327 | |
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| 328 | //We now have a proper context from which to schedule threads |
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[094476d] | 329 | __cfaabi_dbg_print_safe("Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx); |
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[8def349] | 330 | |
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[1c273d0] | 331 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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| 332 | // resume it to start it like it normally would, it will just context switch |
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| 333 | // back to here. Instead directly call the main since we already are on the |
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[8def349] | 334 | // appropriate stack. |
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[094476d] | 335 | get_coroutine(proc->runner)->state = Active; |
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| 336 | main( proc->runner ); |
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| 337 | get_coroutine(proc->runner)->state = Halted; |
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[8def349] | 338 | |
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[0c92c9f] | 339 | // Main routine of the core returned, the core is now fully terminated |
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[094476d] | 340 | __cfaabi_dbg_print_safe("Kernel : core %p main ended (%p)\n", proc, &proc->runner); |
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[8def349] | 341 | |
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| 342 | return NULL; |
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[c84e80a] | 343 | } |
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| 344 | |
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[8def349] | 345 | void start(processor * this) { |
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[36982fc] | 346 | __cfaabi_dbg_print_safe("Kernel : Starting core %p\n", this); |
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[82ff5845] | 347 | |
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[8fcbb4c] | 348 | pthread_create( &this->kernel_thread, NULL, CtxInvokeProcessor, (void*)this ); |
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[eb2e723] | 349 | |
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[36982fc] | 350 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
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[eb2e723] | 351 | } |
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| 352 | |
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[b69ea6b] | 353 | void kernel_first_resume(processor * this) { |
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| 354 | coroutine_desc * src = this_coroutine; |
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[094476d] | 355 | coroutine_desc * dst = get_coroutine(this->runner); |
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[b69ea6b] | 356 | |
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[d8548e2] | 357 | verify( !preemption_state.enabled ); |
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[b69ea6b] | 358 | |
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| 359 | create_stack(&dst->stack, dst->stack.size); |
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[094476d] | 360 | CtxStart(&this->runner, CtxInvokeCoroutine); |
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[b69ea6b] | 361 | |
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[d8548e2] | 362 | verify( !preemption_state.enabled ); |
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[b69ea6b] | 363 | |
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| 364 | dst->last = src; |
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| 365 | dst->starter = dst->starter ? dst->starter : src; |
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| 366 | |
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| 367 | // set state of current coroutine to inactive |
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| 368 | src->state = src->state == Halted ? Halted : Inactive; |
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| 369 | |
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| 370 | // set new coroutine that task is executing |
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| 371 | this_coroutine = dst; |
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| 372 | |
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| 373 | // SKULLDUGGERY normally interrupts are enable before leaving a coroutine ctxswitch. |
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| 374 | // Therefore, when first creating a coroutine, interrupts are enable before calling the main. |
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| 375 | // This is consistent with thread creation. However, when creating the main processor coroutine, |
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| 376 | // we wan't interrupts to be disabled. Therefore, we double-disable interrupts here so they will |
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| 377 | // stay disabled. |
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| 378 | disable_interrupts(); |
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| 379 | |
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| 380 | // context switch to specified coroutine |
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| 381 | assert( src->stack.context ); |
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| 382 | CtxSwitch( src->stack.context, dst->stack.context ); |
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| 383 | // when CtxSwitch returns we are back in the src coroutine |
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| 384 | |
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| 385 | // set state of new coroutine to active |
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| 386 | src->state = Active; |
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| 387 | |
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[d8548e2] | 388 | verify( !preemption_state.enabled ); |
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[b69ea6b] | 389 | } |
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| 390 | |
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[8def349] | 391 | //----------------------------------------------------------------------------- |
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| 392 | // Scheduler routines |
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[348006f] | 393 | void ScheduleThread( thread_desc * thrd ) { |
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[1c273d0] | 394 | // if( !thrd ) return; |
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[135b431] | 395 | verify( thrd ); |
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[b18830e] | 396 | verify( thrd->self_cor.state != Halted ); |
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[1c273d0] | 397 | |
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[d8548e2] | 398 | verify( !preemption_state.enabled ); |
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[690f13c] | 399 | |
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[4aa2fb2] | 400 | verifyf( thrd->next == NULL, "Expected null got %p", thrd->next ); |
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[1c273d0] | 401 | |
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[65deb18] | 402 | with( *this_processor->cltr ) { |
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| 403 | lock ( ready_queue_lock __cfaabi_dbg_ctx2 ); |
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| 404 | append( ready_queue, thrd ); |
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| 405 | unlock( ready_queue_lock ); |
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| 406 | } |
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[1c273d0] | 407 | |
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[d8548e2] | 408 | verify( !preemption_state.enabled ); |
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[db6f06a] | 409 | } |
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| 410 | |
---|
[65deb18] | 411 | thread_desc * nextThread(cluster * this) with( *this ) { |
---|
[d8548e2] | 412 | verify( !preemption_state.enabled ); |
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[65deb18] | 413 | lock( ready_queue_lock __cfaabi_dbg_ctx2 ); |
---|
| 414 | thread_desc * head = pop_head( ready_queue ); |
---|
| 415 | unlock( ready_queue_lock ); |
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[d8548e2] | 416 | verify( !preemption_state.enabled ); |
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[db6f06a] | 417 | return head; |
---|
[eb2e723] | 418 | } |
---|
| 419 | |
---|
[82ff5845] | 420 | void BlockInternal() { |
---|
| 421 | disable_interrupts(); |
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[d8548e2] | 422 | verify( !preemption_state.enabled ); |
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[82c948c] | 423 | returnToKernel(); |
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[d8548e2] | 424 | verify( !preemption_state.enabled ); |
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[36982fc] | 425 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[75f3522] | 426 | } |
---|
| 427 | |
---|
[ea7d2b0] | 428 | void BlockInternal( __spinlock_t * lock ) { |
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[82ff5845] | 429 | disable_interrupts(); |
---|
[89a3df5] | 430 | this_processor->finish.action_code = Release; |
---|
[65deb18] | 431 | this_processor->finish.lock = lock; |
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[0b33412] | 432 | |
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[d8548e2] | 433 | verify( !preemption_state.enabled ); |
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[82c948c] | 434 | returnToKernel(); |
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[d8548e2] | 435 | verify( !preemption_state.enabled ); |
---|
[0b33412] | 436 | |
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[36982fc] | 437 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[db6f06a] | 438 | } |
---|
| 439 | |
---|
[82ff5845] | 440 | void BlockInternal( thread_desc * thrd ) { |
---|
| 441 | disable_interrupts(); |
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[89a3df5] | 442 | this_processor->finish.action_code = Schedule; |
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[65deb18] | 443 | this_processor->finish.thrd = thrd; |
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[0b33412] | 444 | |
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[d8548e2] | 445 | verify( !preemption_state.enabled ); |
---|
[82c948c] | 446 | returnToKernel(); |
---|
[d8548e2] | 447 | verify( !preemption_state.enabled ); |
---|
[0b33412] | 448 | |
---|
[36982fc] | 449 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[db6f06a] | 450 | } |
---|
| 451 | |
---|
[ea7d2b0] | 452 | void BlockInternal( __spinlock_t * lock, thread_desc * thrd ) { |
---|
[97e3296] | 453 | assert(thrd); |
---|
[82ff5845] | 454 | disable_interrupts(); |
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[89a3df5] | 455 | this_processor->finish.action_code = Release_Schedule; |
---|
[65deb18] | 456 | this_processor->finish.lock = lock; |
---|
| 457 | this_processor->finish.thrd = thrd; |
---|
[0b33412] | 458 | |
---|
[d8548e2] | 459 | verify( !preemption_state.enabled ); |
---|
[82c948c] | 460 | returnToKernel(); |
---|
[d8548e2] | 461 | verify( !preemption_state.enabled ); |
---|
[0b33412] | 462 | |
---|
[36982fc] | 463 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[eb2e723] | 464 | } |
---|
| 465 | |
---|
[ea7d2b0] | 466 | void BlockInternal(__spinlock_t * locks [], unsigned short count) { |
---|
[82ff5845] | 467 | disable_interrupts(); |
---|
[0c78741] | 468 | this_processor->finish.action_code = Release_Multi; |
---|
[65deb18] | 469 | this_processor->finish.locks = locks; |
---|
| 470 | this_processor->finish.lock_count = count; |
---|
[0b33412] | 471 | |
---|
[d8548e2] | 472 | verify( !preemption_state.enabled ); |
---|
[82c948c] | 473 | returnToKernel(); |
---|
[d8548e2] | 474 | verify( !preemption_state.enabled ); |
---|
[0b33412] | 475 | |
---|
[36982fc] | 476 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[0c78741] | 477 | } |
---|
| 478 | |
---|
[ea7d2b0] | 479 | void BlockInternal(__spinlock_t * locks [], unsigned short lock_count, thread_desc * thrds [], unsigned short thrd_count) { |
---|
[82ff5845] | 480 | disable_interrupts(); |
---|
[0c78741] | 481 | this_processor->finish.action_code = Release_Multi_Schedule; |
---|
[65deb18] | 482 | this_processor->finish.locks = locks; |
---|
| 483 | this_processor->finish.lock_count = lock_count; |
---|
| 484 | this_processor->finish.thrds = thrds; |
---|
| 485 | this_processor->finish.thrd_count = thrd_count; |
---|
[0b33412] | 486 | |
---|
[d8548e2] | 487 | verify( !preemption_state.enabled ); |
---|
[82c948c] | 488 | returnToKernel(); |
---|
[d8548e2] | 489 | verify( !preemption_state.enabled ); |
---|
[0b33412] | 490 | |
---|
[36982fc] | 491 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[0c78741] | 492 | } |
---|
| 493 | |
---|
[ea7d2b0] | 494 | void LeaveThread(__spinlock_t * lock, thread_desc * thrd) { |
---|
[d8548e2] | 495 | verify( !preemption_state.enabled ); |
---|
[f2b12406] | 496 | this_processor->finish.action_code = thrd ? Release_Schedule : Release; |
---|
[65deb18] | 497 | this_processor->finish.lock = lock; |
---|
| 498 | this_processor->finish.thrd = thrd; |
---|
[f2b12406] | 499 | |
---|
[82c948c] | 500 | returnToKernel(); |
---|
[f2b12406] | 501 | } |
---|
| 502 | |
---|
[fa21ac9] | 503 | //============================================================================================= |
---|
| 504 | // Kernel Setup logic |
---|
| 505 | //============================================================================================= |
---|
[eb2e723] | 506 | //----------------------------------------------------------------------------- |
---|
| 507 | // Kernel boot procedures |
---|
| 508 | void kernel_startup(void) { |
---|
[d8548e2] | 509 | verify( !preemption_state.enabled ); |
---|
[36982fc] | 510 | __cfaabi_dbg_print_safe("Kernel : Starting\n"); |
---|
[eb2e723] | 511 | |
---|
| 512 | // Start by initializing the main thread |
---|
[1c273d0] | 513 | // SKULLDUGGERY: the mainThread steals the process main thread |
---|
[969b3fe] | 514 | // which will then be scheduled by the mainProcessor normally |
---|
| 515 | mainThread = (thread_desc *)&storage_mainThread; |
---|
[8fcbb4c] | 516 | current_stack_info_t info; |
---|
[83a071f9] | 517 | (*mainThread){ &info }; |
---|
[eb2e723] | 518 | |
---|
[36982fc] | 519 | __cfaabi_dbg_print_safe("Kernel : Main thread ready\n"); |
---|
[fa21ac9] | 520 | |
---|
[969b3fe] | 521 | // Initialize the main cluster |
---|
| 522 | mainCluster = (cluster *)&storage_mainCluster; |
---|
[9236060] | 523 | (*mainCluster){}; |
---|
[bd98b58] | 524 | |
---|
[36982fc] | 525 | __cfaabi_dbg_print_safe("Kernel : main cluster ready\n"); |
---|
[fa21ac9] | 526 | |
---|
[969b3fe] | 527 | // Initialize the main processor and the main processor ctx |
---|
[eb2e723] | 528 | // (the coroutine that contains the processing control flow) |
---|
[969b3fe] | 529 | mainProcessor = (processor *)&storage_mainProcessor; |
---|
[9236060] | 530 | (*mainProcessor){ mainCluster, *(processorCtx_t *)&storage_mainProcessorCtx }; |
---|
[eb2e723] | 531 | |
---|
[dcb42b8] | 532 | //initialize the global state variables |
---|
[969b3fe] | 533 | this_processor = mainProcessor; |
---|
[1c273d0] | 534 | this_thread = mainThread; |
---|
[b18830e] | 535 | this_coroutine = &mainThread->self_cor; |
---|
[eb2e723] | 536 | |
---|
[82ff5845] | 537 | // Enable preemption |
---|
| 538 | kernel_start_preemption(); |
---|
| 539 | |
---|
[969b3fe] | 540 | // Add the main thread to the ready queue |
---|
| 541 | // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread |
---|
| 542 | ScheduleThread(mainThread); |
---|
| 543 | |
---|
| 544 | // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX |
---|
[dcb42b8] | 545 | // context. Hence, the main thread does not begin through CtxInvokeThread, like all other threads. The trick here is that |
---|
[1c273d0] | 546 | // mainThread is on the ready queue when this call is made. |
---|
[b69ea6b] | 547 | kernel_first_resume( this_processor ); |
---|
[eb2e723] | 548 | |
---|
[dcb42b8] | 549 | |
---|
| 550 | |
---|
| 551 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
---|
[36982fc] | 552 | __cfaabi_dbg_print_safe("Kernel : Started\n--------------------------------------------------\n\n"); |
---|
[82ff5845] | 553 | |
---|
[d8548e2] | 554 | verify( !preemption_state.enabled ); |
---|
[36982fc] | 555 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[d8548e2] | 556 | verify( preemption_state.enabled ); |
---|
[eb2e723] | 557 | } |
---|
| 558 | |
---|
[dcb42b8] | 559 | void kernel_shutdown(void) { |
---|
[36982fc] | 560 | __cfaabi_dbg_print_safe("\n--------------------------------------------------\nKernel : Shutting down\n"); |
---|
[eb2e723] | 561 | |
---|
[d8548e2] | 562 | verify( preemption_state.enabled ); |
---|
[4e6fb8e] | 563 | disable_interrupts(); |
---|
[d8548e2] | 564 | verify( !preemption_state.enabled ); |
---|
[4e6fb8e] | 565 | |
---|
[969b3fe] | 566 | // SKULLDUGGERY: Notify the mainProcessor it needs to terminates. |
---|
[dcb42b8] | 567 | // When its coroutine terminates, it return control to the mainThread |
---|
| 568 | // which is currently here |
---|
[969b3fe] | 569 | mainProcessor->do_terminate = true; |
---|
[82c948c] | 570 | returnToKernel(); |
---|
[eb2e723] | 571 | |
---|
[dcb42b8] | 572 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
---|
[eb2e723] | 573 | |
---|
[82ff5845] | 574 | // Disable preemption |
---|
| 575 | kernel_stop_preemption(); |
---|
| 576 | |
---|
[969b3fe] | 577 | // Destroy the main processor and its context in reverse order of construction |
---|
[dcb42b8] | 578 | // These were manually constructed so we need manually destroy them |
---|
[094476d] | 579 | ^(mainProcessor->runner){}; |
---|
[969b3fe] | 580 | ^(mainProcessor){}; |
---|
[eb2e723] | 581 | |
---|
[dcb42b8] | 582 | // Final step, destroy the main thread since it is no longer needed |
---|
| 583 | // Since we provided a stack to this taxk it will not destroy anything |
---|
[eb2e723] | 584 | ^(mainThread){}; |
---|
| 585 | |
---|
[36982fc] | 586 | __cfaabi_dbg_print_safe("Kernel : Shutdown complete\n"); |
---|
[9d944b2] | 587 | } |
---|
| 588 | |
---|
[dbe9b08] | 589 | //============================================================================================= |
---|
| 590 | // Unexpected Terminating logic |
---|
| 591 | //============================================================================================= |
---|
| 592 | |
---|
| 593 | |
---|
[ea7d2b0] | 594 | static __spinlock_t kernel_abort_lock; |
---|
| 595 | static __spinlock_t kernel_debug_lock; |
---|
[9d944b2] | 596 | static bool kernel_abort_called = false; |
---|
| 597 | |
---|
| 598 | void * kernel_abort (void) __attribute__ ((__nothrow__)) { |
---|
| 599 | // abort cannot be recursively entered by the same or different processors because all signal handlers return when |
---|
| 600 | // the globalAbort flag is true. |
---|
[36982fc] | 601 | lock( kernel_abort_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 602 | |
---|
| 603 | // first task to abort ? |
---|
| 604 | if ( !kernel_abort_called ) { // not first task to abort ? |
---|
| 605 | kernel_abort_called = true; |
---|
[ea7d2b0] | 606 | unlock( kernel_abort_lock ); |
---|
[1c273d0] | 607 | } |
---|
[9d944b2] | 608 | else { |
---|
[ea7d2b0] | 609 | unlock( kernel_abort_lock ); |
---|
[1c273d0] | 610 | |
---|
[9d944b2] | 611 | sigset_t mask; |
---|
| 612 | sigemptyset( &mask ); |
---|
| 613 | sigaddset( &mask, SIGALRM ); // block SIGALRM signals |
---|
| 614 | sigaddset( &mask, SIGUSR1 ); // block SIGUSR1 signals |
---|
| 615 | sigsuspend( &mask ); // block the processor to prevent further damage during abort |
---|
[1c273d0] | 616 | _exit( EXIT_FAILURE ); // if processor unblocks before it is killed, terminate it |
---|
[9d944b2] | 617 | } |
---|
| 618 | |
---|
[1c273d0] | 619 | return this_thread; |
---|
[9d944b2] | 620 | } |
---|
| 621 | |
---|
| 622 | void kernel_abort_msg( void * kernel_data, char * abort_text, int abort_text_size ) { |
---|
| 623 | thread_desc * thrd = kernel_data; |
---|
| 624 | |
---|
[b18830e] | 625 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing task %.256s (%p)", thrd->self_cor.name, thrd ); |
---|
[36982fc] | 626 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
[9d944b2] | 627 | |
---|
[1c273d0] | 628 | if ( thrd != this_coroutine ) { |
---|
| 629 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", this_coroutine->name, this_coroutine ); |
---|
[36982fc] | 630 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
[1c273d0] | 631 | } |
---|
[9d944b2] | 632 | else { |
---|
[36982fc] | 633 | __cfaabi_dbg_bits_write( ".\n", 2 ); |
---|
[9d944b2] | 634 | } |
---|
| 635 | } |
---|
| 636 | |
---|
[2b8bc41] | 637 | int kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
| 638 | return get_coroutine(this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
| 639 | } |
---|
| 640 | |
---|
[9d944b2] | 641 | extern "C" { |
---|
[36982fc] | 642 | void __cfaabi_dbg_bits_acquire() { |
---|
| 643 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 644 | } |
---|
| 645 | |
---|
[36982fc] | 646 | void __cfaabi_dbg_bits_release() { |
---|
[ea7d2b0] | 647 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 648 | } |
---|
[8118303] | 649 | } |
---|
| 650 | |
---|
[fa21ac9] | 651 | //============================================================================================= |
---|
| 652 | // Kernel Utilities |
---|
| 653 | //============================================================================================= |
---|
[bd98b58] | 654 | //----------------------------------------------------------------------------- |
---|
| 655 | // Locks |
---|
[242a902] | 656 | void ?{}( semaphore & this, int count = 1 ) { |
---|
| 657 | (this.lock){}; |
---|
| 658 | this.count = count; |
---|
| 659 | (this.waiting){}; |
---|
[db6f06a] | 660 | } |
---|
[242a902] | 661 | void ^?{}(semaphore & this) {} |
---|
[db6f06a] | 662 | |
---|
[65deb18] | 663 | void P(semaphore & this) with( this ){ |
---|
| 664 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 665 | count -= 1; |
---|
| 666 | if ( count < 0 ) { |
---|
[bdeba0b] | 667 | // queue current task |
---|
[65deb18] | 668 | append( waiting, (thread_desc *)this_thread ); |
---|
[bdeba0b] | 669 | |
---|
| 670 | // atomically release spin lock and block |
---|
[65deb18] | 671 | BlockInternal( &lock ); |
---|
[8def349] | 672 | } |
---|
[4e6fb8e] | 673 | else { |
---|
[65deb18] | 674 | unlock( lock ); |
---|
[4e6fb8e] | 675 | } |
---|
[bd98b58] | 676 | } |
---|
| 677 | |
---|
[65deb18] | 678 | void V(semaphore & this) with( this ) { |
---|
[bdeba0b] | 679 | thread_desc * thrd = NULL; |
---|
[65deb18] | 680 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 681 | count += 1; |
---|
| 682 | if ( count <= 0 ) { |
---|
[bdeba0b] | 683 | // remove task at head of waiting list |
---|
[65deb18] | 684 | thrd = pop_head( waiting ); |
---|
[bd98b58] | 685 | } |
---|
[bdeba0b] | 686 | |
---|
[65deb18] | 687 | unlock( lock ); |
---|
[bdeba0b] | 688 | |
---|
| 689 | // make new owner |
---|
| 690 | WakeThread( thrd ); |
---|
[bd98b58] | 691 | } |
---|
| 692 | |
---|
[f7d6bb0] | 693 | //----------------------------------------------------------------------------- |
---|
| 694 | // Debug |
---|
| 695 | __cfaabi_dbg_debug_do( |
---|
| 696 | struct { |
---|
| 697 | thread_desc * tail; |
---|
| 698 | } __cfaabi_dbg_thread_list = { NULL }; |
---|
| 699 | |
---|
| 700 | void __cfaabi_dbg_thread_register( thread_desc * thrd ) { |
---|
| 701 | if( !__cfaabi_dbg_thread_list.tail ) { |
---|
| 702 | __cfaabi_dbg_thread_list.tail = thrd; |
---|
| 703 | return; |
---|
| 704 | } |
---|
| 705 | __cfaabi_dbg_thread_list.tail->dbg_next = thrd; |
---|
| 706 | thrd->dbg_prev = __cfaabi_dbg_thread_list.tail; |
---|
| 707 | __cfaabi_dbg_thread_list.tail = thrd; |
---|
| 708 | } |
---|
| 709 | |
---|
| 710 | void __cfaabi_dbg_thread_unregister( thread_desc * thrd ) { |
---|
| 711 | thread_desc * prev = thrd->dbg_prev; |
---|
| 712 | thread_desc * next = thrd->dbg_next; |
---|
| 713 | |
---|
| 714 | if( next ) { next->dbg_prev = prev; } |
---|
| 715 | else { |
---|
| 716 | assert( __cfaabi_dbg_thread_list.tail == thrd ); |
---|
| 717 | __cfaabi_dbg_thread_list.tail = prev; |
---|
| 718 | } |
---|
| 719 | |
---|
| 720 | if( prev ) { prev->dbg_next = next; } |
---|
| 721 | |
---|
| 722 | thrd->dbg_prev = NULL; |
---|
| 723 | thrd->dbg_next = NULL; |
---|
| 724 | } |
---|
| 725 | ) |
---|
[8118303] | 726 | // Local Variables: // |
---|
| 727 | // mode: c // |
---|
| 728 | // tab-width: 4 // |
---|
| 729 | // End: // |
---|