[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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[b158d8f] | 12 | // Last Modified On : Fri Dec 8 16:23:33 2017 |
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| 13 | // Update Count : 3 |
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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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[b158d8f] | 18 | #define ftype `ftype` |
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[eb2e723] | 19 | extern "C" { |
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[9d944b2] | 20 | #include <stdio.h> |
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[8fcbb4c] | 21 | #include <fenv.h> |
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[eb2e723] | 22 | #include <sys/resource.h> |
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[9d944b2] | 23 | #include <signal.h> |
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| 24 | #include <unistd.h> |
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[eb2e723] | 25 | } |
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[b158d8f] | 26 | #undef ftype |
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[8118303] | 27 | |
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| 28 | //CFA Includes |
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[2ac095d] | 29 | #include "kernel_private.h" |
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[c81ebf9] | 30 | #include "preemption.h" |
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[2ac095d] | 31 | #include "startup.h" |
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[8118303] | 32 | |
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| 33 | //Private includes |
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| 34 | #define __CFA_INVOKE_PRIVATE__ |
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| 35 | #include "invoke.h" |
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| 36 | |
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[2ac095d] | 37 | //Start and stop routine for the kernel, declared first to make sure they run first |
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| 38 | void kernel_startup(void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) )); |
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| 39 | void kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) )); |
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| 40 | |
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[8def349] | 41 | //----------------------------------------------------------------------------- |
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| 42 | // Kernel storage |
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[969b3fe] | 43 | KERNEL_STORAGE(cluster, mainCluster); |
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| 44 | KERNEL_STORAGE(processor, mainProcessor); |
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| 45 | KERNEL_STORAGE(processorCtx_t, mainProcessorCtx); |
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| 46 | KERNEL_STORAGE(thread_desc, mainThread); |
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[f2b12406] | 47 | KERNEL_STORAGE(machine_context_t, mainThreadCtx); |
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[8def349] | 48 | |
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[969b3fe] | 49 | cluster * mainCluster; |
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| 50 | processor * mainProcessor; |
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[348006f] | 51 | thread_desc * mainThread; |
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[eb2e723] | 52 | |
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[bd98b58] | 53 | //----------------------------------------------------------------------------- |
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| 54 | // Global state |
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| 55 | |
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[9cc0472] | 56 | thread_local coroutine_desc * volatile this_coroutine; |
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| 57 | thread_local thread_desc * volatile this_thread; |
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| 58 | thread_local processor * volatile this_processor; |
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[969b3fe] | 59 | |
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[d6ff3ff] | 60 | volatile thread_local bool preemption_in_progress = 0; |
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[1c273d0] | 61 | volatile thread_local unsigned short disable_preempt_count = 1; |
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[c84e80a] | 62 | |
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| 63 | //----------------------------------------------------------------------------- |
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[8def349] | 64 | // Main thread construction |
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| 65 | struct current_stack_info_t { |
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[1c273d0] | 66 | machine_context_t ctx; |
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[8def349] | 67 | unsigned int size; // size of stack |
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| 68 | void *base; // base of stack |
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| 69 | void *storage; // pointer to stack |
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| 70 | void *limit; // stack grows towards stack limit |
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| 71 | void *context; // address of cfa_context_t |
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| 72 | void *top; // address of top of storage |
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[c84e80a] | 73 | }; |
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| 74 | |
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[242a902] | 75 | void ?{}( current_stack_info_t & this ) { |
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| 76 | CtxGet( this.ctx ); |
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| 77 | this.base = this.ctx.FP; |
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| 78 | this.storage = this.ctx.SP; |
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[8def349] | 79 | |
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| 80 | rlimit r; |
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[132fad4] | 81 | getrlimit( RLIMIT_STACK, &r); |
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[242a902] | 82 | this.size = r.rlim_cur; |
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[8def349] | 83 | |
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[242a902] | 84 | this.limit = (void *)(((intptr_t)this.base) - this.size); |
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[9236060] | 85 | this.context = &storage_mainThreadCtx; |
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[242a902] | 86 | this.top = this.base; |
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[8def349] | 87 | } |
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| 88 | |
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[65deb18] | 89 | void ?{}( coStack_t & this, current_stack_info_t * info) with( this ) { |
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| 90 | size = info->size; |
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| 91 | storage = info->storage; |
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| 92 | limit = info->limit; |
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| 93 | base = info->base; |
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| 94 | context = info->context; |
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| 95 | top = info->top; |
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| 96 | userStack = true; |
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[8def349] | 97 | } |
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| 98 | |
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[65deb18] | 99 | void ?{}( coroutine_desc & this, current_stack_info_t * info) with( this ) { |
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| 100 | stack{ info }; |
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| 101 | name = "Main Thread"; |
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| 102 | errno_ = 0; |
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| 103 | state = Start; |
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| 104 | starter = NULL; |
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[8def349] | 105 | } |
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| 106 | |
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[65deb18] | 107 | void ?{}( thread_desc & this, current_stack_info_t * info) with( this ) { |
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| 108 | self_cor{ info }; |
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[8def349] | 109 | } |
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[c84e80a] | 110 | |
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[8def349] | 111 | //----------------------------------------------------------------------------- |
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| 112 | // Processor coroutine |
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[39fea2f] | 113 | |
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| 114 | // Construct the processor context of the main processor |
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[242a902] | 115 | void ?{}(processorCtx_t & this, processor * proc) { |
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| 116 | (this.__cor){ "Processor" }; |
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[b462670] | 117 | this.__cor.starter = NULL; |
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[242a902] | 118 | this.proc = proc; |
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| 119 | proc->runner = &this; |
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[8def349] | 120 | } |
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| 121 | |
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[39fea2f] | 122 | // Construct the processor context of non-main processors |
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[242a902] | 123 | void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) { |
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| 124 | (this.__cor){ info }; |
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| 125 | this.proc = proc; |
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| 126 | proc->runner = &this; |
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[8def349] | 127 | } |
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| 128 | |
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[242a902] | 129 | void ?{}(processor & this) { |
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[969b3fe] | 130 | this{ mainCluster }; |
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[8def349] | 131 | } |
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| 132 | |
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[242a902] | 133 | void ?{}(processor & this, cluster * cltr) { |
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| 134 | this.cltr = cltr; |
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[65deb18] | 135 | this.terminated{ 0 }; |
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[9236060] | 136 | this.do_terminate = false; |
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[242a902] | 137 | this.preemption_alarm = NULL; |
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| 138 | this.pending_preemption = false; |
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[8def349] | 139 | |
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[242a902] | 140 | start( &this ); |
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[c84e80a] | 141 | } |
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| 142 | |
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[83a071f9] | 143 | void ?{}(processor & this, cluster * cltr, processorCtx_t & runner) { |
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[242a902] | 144 | this.cltr = cltr; |
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[65deb18] | 145 | this.terminated{ 0 }; |
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[9236060] | 146 | this.do_terminate = false; |
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[242a902] | 147 | this.preemption_alarm = NULL; |
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| 148 | this.pending_preemption = false; |
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| 149 | this.kernel_thread = pthread_self(); |
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[8def349] | 150 | |
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[83a071f9] | 151 | this.runner = &runner; |
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[36982fc] | 152 | __cfaabi_dbg_print_safe("Kernel : constructing main processor context %p\n", &runner); |
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[83a071f9] | 153 | runner{ &this }; |
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[8def349] | 154 | } |
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| 155 | |
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[65deb18] | 156 | void ^?{}(processor & this) with( this ){ |
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| 157 | if( ! do_terminate ) { |
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[36982fc] | 158 | __cfaabi_dbg_print_safe("Kernel : core %p signaling termination\n", &this); |
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[65deb18] | 159 | do_terminate = true; |
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| 160 | P( terminated ); |
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| 161 | pthread_join( kernel_thread, NULL ); |
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[8def349] | 162 | } |
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| 163 | } |
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| 164 | |
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[65deb18] | 165 | void ?{}(cluster & this) with( this ) { |
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| 166 | ready_queue{}; |
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| 167 | ready_queue_lock{}; |
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[e60e0dc] | 168 | |
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[65deb18] | 169 | preemption = default_preemption(); |
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[8def349] | 170 | } |
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| 171 | |
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[242a902] | 172 | void ^?{}(cluster & this) { |
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[1c273d0] | 173 | |
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[c84e80a] | 174 | } |
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| 175 | |
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[75f3522] | 176 | //============================================================================================= |
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| 177 | // Kernel Scheduling logic |
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| 178 | //============================================================================================= |
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[8fcbb4c] | 179 | //Main of the processor contexts |
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[83a071f9] | 180 | void main(processorCtx_t & runner) { |
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| 181 | processor * this = runner.proc; |
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[c81ebf9] | 182 | |
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[36982fc] | 183 | __cfaabi_dbg_print_safe("Kernel : core %p starting\n", this); |
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[8118303] | 184 | |
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[75f3522] | 185 | { |
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[c81ebf9] | 186 | // Setup preemption data |
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| 187 | preemption_scope scope = { this }; |
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| 188 | |
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[36982fc] | 189 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
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[8118303] | 190 | |
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[c81ebf9] | 191 | thread_desc * readyThread = NULL; |
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[e60e0dc] | 192 | for( unsigned int spin_count = 0; ! this->do_terminate; spin_count++ ) |
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[75f3522] | 193 | { |
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[c81ebf9] | 194 | readyThread = nextThread( this->cltr ); |
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[75f3522] | 195 | |
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[c81ebf9] | 196 | if(readyThread) |
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| 197 | { |
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[0b33412] | 198 | verify( disable_preempt_count > 0 ); |
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[4e6fb8e] | 199 | |
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[c81ebf9] | 200 | runThread(this, readyThread); |
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[75f3522] | 201 | |
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[0b33412] | 202 | verify( disable_preempt_count > 0 ); |
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[4e6fb8e] | 203 | |
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[c81ebf9] | 204 | //Some actions need to be taken from the kernel |
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| 205 | finishRunning(this); |
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| 206 | |
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| 207 | spin_count = 0; |
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| 208 | } |
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| 209 | else |
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| 210 | { |
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| 211 | spin(this, &spin_count); |
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| 212 | } |
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| 213 | } |
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| 214 | |
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[36982fc] | 215 | __cfaabi_dbg_print_safe("Kernel : core %p stopping\n", this); |
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[c84e80a] | 216 | } |
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[8118303] | 217 | |
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[4cedd9f] | 218 | V( this->terminated ); |
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[bdeba0b] | 219 | |
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[36982fc] | 220 | __cfaabi_dbg_print_safe("Kernel : core %p terminated\n", this); |
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[c84e80a] | 221 | } |
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| 222 | |
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[1c273d0] | 223 | // runThread runs a thread by context switching |
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| 224 | // from the processor coroutine to the target thread |
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[348006f] | 225 | void runThread(processor * this, thread_desc * dst) { |
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[83a071f9] | 226 | coroutine_desc * proc_cor = get_coroutine(*this->runner); |
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[c3acb841] | 227 | coroutine_desc * thrd_cor = get_coroutine(dst); |
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[1c273d0] | 228 | |
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[75f3522] | 229 | //Reset the terminating actions here |
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[db6f06a] | 230 | this->finish.action_code = No_Action; |
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[8fcbb4c] | 231 | |
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[75f3522] | 232 | //Update global state |
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[1c273d0] | 233 | this_thread = dst; |
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[75f3522] | 234 | |
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| 235 | // Context Switch to the thread |
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| 236 | ThreadCtxSwitch(proc_cor, thrd_cor); |
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| 237 | // when ThreadCtxSwitch returns we are back in the processor coroutine |
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| 238 | } |
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| 239 | |
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[1c273d0] | 240 | // Once a thread has finished running, some of |
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[75f3522] | 241 | // its final actions must be executed from the kernel |
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[65deb18] | 242 | void finishRunning(processor * this) with( this->finish ) { |
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| 243 | if( action_code == Release ) { |
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[2e9aed4] | 244 | verify( disable_preempt_count > 1 ); |
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[65deb18] | 245 | unlock( *lock ); |
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[db6f06a] | 246 | } |
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[65deb18] | 247 | else if( action_code == Schedule ) { |
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| 248 | ScheduleThread( thrd ); |
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[db6f06a] | 249 | } |
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[65deb18] | 250 | else if( action_code == Release_Schedule ) { |
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[2e9aed4] | 251 | verify( disable_preempt_count > 1 ); |
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[65deb18] | 252 | unlock( *lock ); |
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| 253 | ScheduleThread( thrd ); |
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[db6f06a] | 254 | } |
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[65deb18] | 255 | else if( action_code == Release_Multi ) { |
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[7416d46a] | 256 | verify( disable_preempt_count > lock_count ); |
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[65deb18] | 257 | for(int i = 0; i < lock_count; i++) { |
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| 258 | unlock( *locks[i] ); |
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[0c78741] | 259 | } |
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| 260 | } |
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[65deb18] | 261 | else if( action_code == Release_Multi_Schedule ) { |
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| 262 | for(int i = 0; i < lock_count; i++) { |
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| 263 | unlock( *locks[i] ); |
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[0c78741] | 264 | } |
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[65deb18] | 265 | for(int i = 0; i < thrd_count; i++) { |
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| 266 | ScheduleThread( thrds[i] ); |
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[0c78741] | 267 | } |
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| 268 | } |
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[db6f06a] | 269 | else { |
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[65deb18] | 270 | assert(action_code == No_Action); |
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[8fcbb4c] | 271 | } |
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[c84e80a] | 272 | } |
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| 273 | |
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[0c92c9f] | 274 | // Handles spinning logic |
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| 275 | // TODO : find some strategy to put cores to sleep after some time |
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[c84e80a] | 276 | void spin(processor * this, unsigned int * spin_count) { |
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| 277 | (*spin_count)++; |
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| 278 | } |
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| 279 | |
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[0c92c9f] | 280 | // Context invoker for processors |
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| 281 | // This is the entry point for processors (kernel threads) |
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| 282 | // It effectively constructs a coroutine by stealing the pthread stack |
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[8def349] | 283 | void * CtxInvokeProcessor(void * arg) { |
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| 284 | processor * proc = (processor *) arg; |
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| 285 | this_processor = proc; |
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[1c273d0] | 286 | this_coroutine = NULL; |
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| 287 | this_thread = NULL; |
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[4e6fb8e] | 288 | disable_preempt_count = 1; |
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[8def349] | 289 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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| 290 | // which is needed for the 2-step context switch. However, there is no reason |
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[1c273d0] | 291 | // to waste the perfectly valid stack create by pthread. |
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[8def349] | 292 | current_stack_info_t info; |
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| 293 | machine_context_t ctx; |
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| 294 | info.context = &ctx; |
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| 295 | processorCtx_t proc_cor_storage = { proc, &info }; |
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| 296 | |
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[36982fc] | 297 | __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", proc_cor_storage.__cor.stack.base); |
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[8fcbb4c] | 298 | |
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[0c92c9f] | 299 | //Set global state |
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[1c273d0] | 300 | this_coroutine = &proc->runner->__cor; |
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| 301 | this_thread = NULL; |
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[8def349] | 302 | |
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| 303 | //We now have a proper context from which to schedule threads |
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[36982fc] | 304 | __cfaabi_dbg_print_safe("Kernel : core %p created (%p, %p)\n", proc, proc->runner, &ctx); |
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[8def349] | 305 | |
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[1c273d0] | 306 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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| 307 | // resume it to start it like it normally would, it will just context switch |
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| 308 | // back to here. Instead directly call the main since we already are on the |
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[8def349] | 309 | // appropriate stack. |
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[17af7d1] | 310 | proc_cor_storage.__cor.state = Active; |
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[83a071f9] | 311 | main( proc_cor_storage ); |
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[4aa2fb2] | 312 | proc_cor_storage.__cor.state = Halted; |
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[8def349] | 313 | |
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[0c92c9f] | 314 | // Main routine of the core returned, the core is now fully terminated |
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[36982fc] | 315 | __cfaabi_dbg_print_safe("Kernel : core %p main ended (%p)\n", proc, proc->runner); |
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[8def349] | 316 | |
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| 317 | return NULL; |
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[c84e80a] | 318 | } |
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| 319 | |
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[8def349] | 320 | void start(processor * this) { |
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[36982fc] | 321 | __cfaabi_dbg_print_safe("Kernel : Starting core %p\n", this); |
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[82ff5845] | 322 | |
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[8fcbb4c] | 323 | pthread_create( &this->kernel_thread, NULL, CtxInvokeProcessor, (void*)this ); |
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[eb2e723] | 324 | |
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[36982fc] | 325 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
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[eb2e723] | 326 | } |
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| 327 | |
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[8def349] | 328 | //----------------------------------------------------------------------------- |
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| 329 | // Scheduler routines |
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[348006f] | 330 | void ScheduleThread( thread_desc * thrd ) { |
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[1c273d0] | 331 | // if( !thrd ) return; |
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[135b431] | 332 | verify( thrd ); |
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[b18830e] | 333 | verify( thrd->self_cor.state != Halted ); |
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[1c273d0] | 334 | |
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| 335 | verify( disable_preempt_count > 0 ); |
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[690f13c] | 336 | |
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[4aa2fb2] | 337 | verifyf( thrd->next == NULL, "Expected null got %p", thrd->next ); |
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[1c273d0] | 338 | |
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[65deb18] | 339 | with( *this_processor->cltr ) { |
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| 340 | lock ( ready_queue_lock __cfaabi_dbg_ctx2 ); |
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| 341 | append( ready_queue, thrd ); |
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| 342 | unlock( ready_queue_lock ); |
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| 343 | } |
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[1c273d0] | 344 | |
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| 345 | verify( disable_preempt_count > 0 ); |
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[db6f06a] | 346 | } |
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| 347 | |
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[65deb18] | 348 | thread_desc * nextThread(cluster * this) with( *this ) { |
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[1c273d0] | 349 | verify( disable_preempt_count > 0 ); |
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[65deb18] | 350 | lock( ready_queue_lock __cfaabi_dbg_ctx2 ); |
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| 351 | thread_desc * head = pop_head( ready_queue ); |
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| 352 | unlock( ready_queue_lock ); |
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[1c273d0] | 353 | verify( disable_preempt_count > 0 ); |
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[db6f06a] | 354 | return head; |
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[eb2e723] | 355 | } |
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| 356 | |
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[82ff5845] | 357 | void BlockInternal() { |
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| 358 | disable_interrupts(); |
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[0b33412] | 359 | verify( disable_preempt_count > 0 ); |
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[75f3522] | 360 | suspend(); |
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[0b33412] | 361 | verify( disable_preempt_count > 0 ); |
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[36982fc] | 362 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[75f3522] | 363 | } |
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| 364 | |
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[ea7d2b0] | 365 | void BlockInternal( __spinlock_t * lock ) { |
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[82ff5845] | 366 | disable_interrupts(); |
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[89a3df5] | 367 | this_processor->finish.action_code = Release; |
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[65deb18] | 368 | this_processor->finish.lock = lock; |
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[0b33412] | 369 | |
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[2e9aed4] | 370 | verify( disable_preempt_count > 1 ); |
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[db6f06a] | 371 | suspend(); |
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[0b33412] | 372 | verify( disable_preempt_count > 0 ); |
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| 373 | |
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[36982fc] | 374 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[db6f06a] | 375 | } |
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| 376 | |
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[82ff5845] | 377 | void BlockInternal( thread_desc * thrd ) { |
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| 378 | disable_interrupts(); |
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[89a3df5] | 379 | this_processor->finish.action_code = Schedule; |
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[65deb18] | 380 | this_processor->finish.thrd = thrd; |
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[0b33412] | 381 | |
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| 382 | verify( disable_preempt_count > 0 ); |
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[db6f06a] | 383 | suspend(); |
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[0b33412] | 384 | verify( disable_preempt_count > 0 ); |
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| 385 | |
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[36982fc] | 386 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[db6f06a] | 387 | } |
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| 388 | |
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[ea7d2b0] | 389 | void BlockInternal( __spinlock_t * lock, thread_desc * thrd ) { |
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[97e3296] | 390 | assert(thrd); |
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[82ff5845] | 391 | disable_interrupts(); |
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[89a3df5] | 392 | this_processor->finish.action_code = Release_Schedule; |
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[65deb18] | 393 | this_processor->finish.lock = lock; |
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| 394 | this_processor->finish.thrd = thrd; |
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[0b33412] | 395 | |
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[2e9aed4] | 396 | verify( disable_preempt_count > 1 ); |
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[db6f06a] | 397 | suspend(); |
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[0b33412] | 398 | verify( disable_preempt_count > 0 ); |
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| 399 | |
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[36982fc] | 400 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[eb2e723] | 401 | } |
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| 402 | |
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[ea7d2b0] | 403 | void BlockInternal(__spinlock_t * locks [], unsigned short count) { |
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[82ff5845] | 404 | disable_interrupts(); |
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[0c78741] | 405 | this_processor->finish.action_code = Release_Multi; |
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[65deb18] | 406 | this_processor->finish.locks = locks; |
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| 407 | this_processor->finish.lock_count = count; |
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[0b33412] | 408 | |
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| 409 | verify( disable_preempt_count > 0 ); |
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[0c78741] | 410 | suspend(); |
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[0b33412] | 411 | verify( disable_preempt_count > 0 ); |
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| 412 | |
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[36982fc] | 413 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[0c78741] | 414 | } |
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| 415 | |
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[ea7d2b0] | 416 | void BlockInternal(__spinlock_t * locks [], unsigned short lock_count, thread_desc * thrds [], unsigned short thrd_count) { |
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[82ff5845] | 417 | disable_interrupts(); |
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[0c78741] | 418 | this_processor->finish.action_code = Release_Multi_Schedule; |
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[65deb18] | 419 | this_processor->finish.locks = locks; |
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| 420 | this_processor->finish.lock_count = lock_count; |
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| 421 | this_processor->finish.thrds = thrds; |
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| 422 | this_processor->finish.thrd_count = thrd_count; |
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[0b33412] | 423 | |
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| 424 | verify( disable_preempt_count > 0 ); |
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[0c78741] | 425 | suspend(); |
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[0b33412] | 426 | verify( disable_preempt_count > 0 ); |
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| 427 | |
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[36982fc] | 428 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[0c78741] | 429 | } |
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| 430 | |
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[ea7d2b0] | 431 | void LeaveThread(__spinlock_t * lock, thread_desc * thrd) { |
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[f2b12406] | 432 | verify( disable_preempt_count > 0 ); |
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| 433 | this_processor->finish.action_code = thrd ? Release_Schedule : Release; |
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[65deb18] | 434 | this_processor->finish.lock = lock; |
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| 435 | this_processor->finish.thrd = thrd; |
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[f2b12406] | 436 | |
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| 437 | suspend(); |
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| 438 | } |
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| 439 | |
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[fa21ac9] | 440 | //============================================================================================= |
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| 441 | // Kernel Setup logic |
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| 442 | //============================================================================================= |
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[eb2e723] | 443 | //----------------------------------------------------------------------------- |
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| 444 | // Kernel boot procedures |
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| 445 | void kernel_startup(void) { |
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[36982fc] | 446 | __cfaabi_dbg_print_safe("Kernel : Starting\n"); |
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[eb2e723] | 447 | |
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| 448 | // Start by initializing the main thread |
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[1c273d0] | 449 | // SKULLDUGGERY: the mainThread steals the process main thread |
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[969b3fe] | 450 | // which will then be scheduled by the mainProcessor normally |
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| 451 | mainThread = (thread_desc *)&storage_mainThread; |
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[8fcbb4c] | 452 | current_stack_info_t info; |
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[83a071f9] | 453 | (*mainThread){ &info }; |
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[eb2e723] | 454 | |
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[36982fc] | 455 | __cfaabi_dbg_print_safe("Kernel : Main thread ready\n"); |
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[fa21ac9] | 456 | |
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[969b3fe] | 457 | // Initialize the main cluster |
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| 458 | mainCluster = (cluster *)&storage_mainCluster; |
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[9236060] | 459 | (*mainCluster){}; |
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[bd98b58] | 460 | |
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[36982fc] | 461 | __cfaabi_dbg_print_safe("Kernel : main cluster ready\n"); |
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[fa21ac9] | 462 | |
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[969b3fe] | 463 | // Initialize the main processor and the main processor ctx |
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[eb2e723] | 464 | // (the coroutine that contains the processing control flow) |
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[969b3fe] | 465 | mainProcessor = (processor *)&storage_mainProcessor; |
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[9236060] | 466 | (*mainProcessor){ mainCluster, *(processorCtx_t *)&storage_mainProcessorCtx }; |
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[eb2e723] | 467 | |
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[dcb42b8] | 468 | //initialize the global state variables |
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[969b3fe] | 469 | this_processor = mainProcessor; |
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[1c273d0] | 470 | this_thread = mainThread; |
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[b18830e] | 471 | this_coroutine = &mainThread->self_cor; |
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[eb2e723] | 472 | |
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[82ff5845] | 473 | // Enable preemption |
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| 474 | kernel_start_preemption(); |
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| 475 | |
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[969b3fe] | 476 | // Add the main thread to the ready queue |
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| 477 | // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread |
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| 478 | ScheduleThread(mainThread); |
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| 479 | |
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| 480 | // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX |
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[dcb42b8] | 481 | // context. Hence, the main thread does not begin through CtxInvokeThread, like all other threads. The trick here is that |
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[1c273d0] | 482 | // mainThread is on the ready queue when this call is made. |
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[9236060] | 483 | resume( *mainProcessor->runner ); |
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[eb2e723] | 484 | |
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[dcb42b8] | 485 | |
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| 486 | |
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| 487 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
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[36982fc] | 488 | __cfaabi_dbg_print_safe("Kernel : Started\n--------------------------------------------------\n\n"); |
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[82ff5845] | 489 | |
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[36982fc] | 490 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[eb2e723] | 491 | } |
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| 492 | |
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[dcb42b8] | 493 | void kernel_shutdown(void) { |
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[36982fc] | 494 | __cfaabi_dbg_print_safe("\n--------------------------------------------------\nKernel : Shutting down\n"); |
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[eb2e723] | 495 | |
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[4e6fb8e] | 496 | disable_interrupts(); |
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| 497 | |
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[969b3fe] | 498 | // SKULLDUGGERY: Notify the mainProcessor it needs to terminates. |
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[dcb42b8] | 499 | // When its coroutine terminates, it return control to the mainThread |
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| 500 | // which is currently here |
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[969b3fe] | 501 | mainProcessor->do_terminate = true; |
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[eb2e723] | 502 | suspend(); |
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| 503 | |
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[dcb42b8] | 504 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
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[eb2e723] | 505 | |
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[82ff5845] | 506 | // Disable preemption |
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| 507 | kernel_stop_preemption(); |
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| 508 | |
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[969b3fe] | 509 | // Destroy the main processor and its context in reverse order of construction |
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[dcb42b8] | 510 | // These were manually constructed so we need manually destroy them |
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[9236060] | 511 | ^(*mainProcessor->runner){}; |
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[969b3fe] | 512 | ^(mainProcessor){}; |
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[eb2e723] | 513 | |
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[dcb42b8] | 514 | // Final step, destroy the main thread since it is no longer needed |
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| 515 | // Since we provided a stack to this taxk it will not destroy anything |
---|
[eb2e723] | 516 | ^(mainThread){}; |
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| 517 | |
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[36982fc] | 518 | __cfaabi_dbg_print_safe("Kernel : Shutdown complete\n"); |
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[9d944b2] | 519 | } |
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| 520 | |
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[dbe9b08] | 521 | //============================================================================================= |
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| 522 | // Unexpected Terminating logic |
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| 523 | //============================================================================================= |
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| 524 | |
---|
| 525 | |
---|
[ea7d2b0] | 526 | static __spinlock_t kernel_abort_lock; |
---|
| 527 | static __spinlock_t kernel_debug_lock; |
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[9d944b2] | 528 | static bool kernel_abort_called = false; |
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| 529 | |
---|
| 530 | void * kernel_abort (void) __attribute__ ((__nothrow__)) { |
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| 531 | // abort cannot be recursively entered by the same or different processors because all signal handlers return when |
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| 532 | // the globalAbort flag is true. |
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[36982fc] | 533 | lock( kernel_abort_lock __cfaabi_dbg_ctx2 ); |
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[9d944b2] | 534 | |
---|
| 535 | // first task to abort ? |
---|
| 536 | if ( !kernel_abort_called ) { // not first task to abort ? |
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| 537 | kernel_abort_called = true; |
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[ea7d2b0] | 538 | unlock( kernel_abort_lock ); |
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[1c273d0] | 539 | } |
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[9d944b2] | 540 | else { |
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[ea7d2b0] | 541 | unlock( kernel_abort_lock ); |
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[1c273d0] | 542 | |
---|
[9d944b2] | 543 | sigset_t mask; |
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| 544 | sigemptyset( &mask ); |
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| 545 | sigaddset( &mask, SIGALRM ); // block SIGALRM signals |
---|
| 546 | sigaddset( &mask, SIGUSR1 ); // block SIGUSR1 signals |
---|
| 547 | sigsuspend( &mask ); // block the processor to prevent further damage during abort |
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[1c273d0] | 548 | _exit( EXIT_FAILURE ); // if processor unblocks before it is killed, terminate it |
---|
[9d944b2] | 549 | } |
---|
| 550 | |
---|
[1c273d0] | 551 | return this_thread; |
---|
[9d944b2] | 552 | } |
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| 553 | |
---|
| 554 | void kernel_abort_msg( void * kernel_data, char * abort_text, int abort_text_size ) { |
---|
| 555 | thread_desc * thrd = kernel_data; |
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| 556 | |
---|
[b18830e] | 557 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing task %.256s (%p)", thrd->self_cor.name, thrd ); |
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[36982fc] | 558 | __cfaabi_dbg_bits_write( abort_text, len ); |
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[9d944b2] | 559 | |
---|
[1c273d0] | 560 | if ( thrd != this_coroutine ) { |
---|
| 561 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", this_coroutine->name, this_coroutine ); |
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[36982fc] | 562 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
[1c273d0] | 563 | } |
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[9d944b2] | 564 | else { |
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[36982fc] | 565 | __cfaabi_dbg_bits_write( ".\n", 2 ); |
---|
[9d944b2] | 566 | } |
---|
| 567 | } |
---|
| 568 | |
---|
| 569 | extern "C" { |
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[36982fc] | 570 | void __cfaabi_dbg_bits_acquire() { |
---|
| 571 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 572 | } |
---|
| 573 | |
---|
[36982fc] | 574 | void __cfaabi_dbg_bits_release() { |
---|
[ea7d2b0] | 575 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 576 | } |
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[8118303] | 577 | } |
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| 578 | |
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[fa21ac9] | 579 | //============================================================================================= |
---|
| 580 | // Kernel Utilities |
---|
| 581 | //============================================================================================= |
---|
[bd98b58] | 582 | //----------------------------------------------------------------------------- |
---|
| 583 | // Locks |
---|
[242a902] | 584 | void ?{}( semaphore & this, int count = 1 ) { |
---|
| 585 | (this.lock){}; |
---|
| 586 | this.count = count; |
---|
| 587 | (this.waiting){}; |
---|
[db6f06a] | 588 | } |
---|
[242a902] | 589 | void ^?{}(semaphore & this) {} |
---|
[db6f06a] | 590 | |
---|
[65deb18] | 591 | void P(semaphore & this) with( this ){ |
---|
| 592 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 593 | count -= 1; |
---|
| 594 | if ( count < 0 ) { |
---|
[bdeba0b] | 595 | // queue current task |
---|
[65deb18] | 596 | append( waiting, (thread_desc *)this_thread ); |
---|
[bdeba0b] | 597 | |
---|
| 598 | // atomically release spin lock and block |
---|
[65deb18] | 599 | BlockInternal( &lock ); |
---|
[8def349] | 600 | } |
---|
[4e6fb8e] | 601 | else { |
---|
[65deb18] | 602 | unlock( lock ); |
---|
[4e6fb8e] | 603 | } |
---|
[bd98b58] | 604 | } |
---|
| 605 | |
---|
[65deb18] | 606 | void V(semaphore & this) with( this ) { |
---|
[bdeba0b] | 607 | thread_desc * thrd = NULL; |
---|
[65deb18] | 608 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 609 | count += 1; |
---|
| 610 | if ( count <= 0 ) { |
---|
[bdeba0b] | 611 | // remove task at head of waiting list |
---|
[65deb18] | 612 | thrd = pop_head( waiting ); |
---|
[bd98b58] | 613 | } |
---|
[bdeba0b] | 614 | |
---|
[65deb18] | 615 | unlock( lock ); |
---|
[bdeba0b] | 616 | |
---|
| 617 | // make new owner |
---|
| 618 | WakeThread( thrd ); |
---|
[bd98b58] | 619 | } |
---|
| 620 | |
---|
[f7d6bb0] | 621 | //----------------------------------------------------------------------------- |
---|
| 622 | // Debug |
---|
| 623 | __cfaabi_dbg_debug_do( |
---|
| 624 | struct { |
---|
| 625 | thread_desc * tail; |
---|
| 626 | } __cfaabi_dbg_thread_list = { NULL }; |
---|
| 627 | |
---|
| 628 | void __cfaabi_dbg_thread_register( thread_desc * thrd ) { |
---|
| 629 | if( !__cfaabi_dbg_thread_list.tail ) { |
---|
| 630 | __cfaabi_dbg_thread_list.tail = thrd; |
---|
| 631 | return; |
---|
| 632 | } |
---|
| 633 | __cfaabi_dbg_thread_list.tail->dbg_next = thrd; |
---|
| 634 | thrd->dbg_prev = __cfaabi_dbg_thread_list.tail; |
---|
| 635 | __cfaabi_dbg_thread_list.tail = thrd; |
---|
| 636 | } |
---|
| 637 | |
---|
| 638 | void __cfaabi_dbg_thread_unregister( thread_desc * thrd ) { |
---|
| 639 | thread_desc * prev = thrd->dbg_prev; |
---|
| 640 | thread_desc * next = thrd->dbg_next; |
---|
| 641 | |
---|
| 642 | if( next ) { next->dbg_prev = prev; } |
---|
| 643 | else { |
---|
| 644 | assert( __cfaabi_dbg_thread_list.tail == thrd ); |
---|
| 645 | __cfaabi_dbg_thread_list.tail = prev; |
---|
| 646 | } |
---|
| 647 | |
---|
| 648 | if( prev ) { prev->dbg_next = next; } |
---|
| 649 | |
---|
| 650 | thrd->dbg_prev = NULL; |
---|
| 651 | thrd->dbg_next = NULL; |
---|
| 652 | } |
---|
| 653 | ) |
---|
[8118303] | 654 | // Local Variables: // |
---|
| 655 | // mode: c // |
---|
| 656 | // tab-width: 4 // |
---|
| 657 | // End: // |
---|