[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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[d6ff3ff] | 58 | volatile thread_local bool preemption_in_progress = 0; |
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[d0a045c7] | 59 | volatile thread_local bool preemption_enabled = false; |
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[1c273d0] | 60 | volatile thread_local unsigned short disable_preempt_count = 1; |
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[c84e80a] | 61 | |
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| 62 | //----------------------------------------------------------------------------- |
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[8def349] | 63 | // Main thread construction |
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| 64 | struct current_stack_info_t { |
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[1c273d0] | 65 | machine_context_t ctx; |
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[8def349] | 66 | unsigned int size; // size of stack |
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| 67 | void *base; // base of stack |
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| 68 | void *storage; // pointer to stack |
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| 69 | void *limit; // stack grows towards stack limit |
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| 70 | void *context; // address of cfa_context_t |
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| 71 | void *top; // address of top of storage |
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[c84e80a] | 72 | }; |
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| 73 | |
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[242a902] | 74 | void ?{}( current_stack_info_t & this ) { |
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| 75 | CtxGet( this.ctx ); |
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| 76 | this.base = this.ctx.FP; |
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| 77 | this.storage = this.ctx.SP; |
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[8def349] | 78 | |
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| 79 | rlimit r; |
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[132fad4] | 80 | getrlimit( RLIMIT_STACK, &r); |
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[242a902] | 81 | this.size = r.rlim_cur; |
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[8def349] | 82 | |
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[242a902] | 83 | this.limit = (void *)(((intptr_t)this.base) - this.size); |
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[9236060] | 84 | this.context = &storage_mainThreadCtx; |
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[242a902] | 85 | this.top = this.base; |
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[8def349] | 86 | } |
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| 87 | |
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[65deb18] | 88 | void ?{}( coStack_t & this, current_stack_info_t * info) with( this ) { |
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| 89 | size = info->size; |
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| 90 | storage = info->storage; |
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| 91 | limit = info->limit; |
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| 92 | base = info->base; |
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| 93 | context = info->context; |
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| 94 | top = info->top; |
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| 95 | userStack = true; |
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[8def349] | 96 | } |
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| 97 | |
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[65deb18] | 98 | void ?{}( coroutine_desc & this, current_stack_info_t * info) with( this ) { |
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| 99 | stack{ info }; |
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| 100 | name = "Main Thread"; |
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| 101 | errno_ = 0; |
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| 102 | state = Start; |
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| 103 | starter = NULL; |
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[8def349] | 104 | } |
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| 105 | |
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[65deb18] | 106 | void ?{}( thread_desc & this, current_stack_info_t * info) with( this ) { |
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| 107 | self_cor{ info }; |
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[82c948c] | 108 | curr_cor = &self_cor; |
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| 109 | self_mon.owner = &this; |
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| 110 | self_mon.recursion = 1; |
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| 111 | self_mon_p = &self_mon; |
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| 112 | next = NULL; |
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| 113 | __cfaabi_dbg_debug_do( |
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| 114 | dbg_next = NULL; |
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| 115 | dbg_prev = NULL; |
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| 116 | __cfaabi_dbg_thread_register(&this); |
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| 117 | ) |
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| 118 | |
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| 119 | monitors{ &self_mon_p, 1, (fptr_t)0 }; |
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[8def349] | 120 | } |
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[c84e80a] | 121 | |
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[8def349] | 122 | //----------------------------------------------------------------------------- |
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| 123 | // Processor coroutine |
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[39fea2f] | 124 | |
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| 125 | // Construct the processor context of the main processor |
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[242a902] | 126 | void ?{}(processorCtx_t & this, processor * proc) { |
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| 127 | (this.__cor){ "Processor" }; |
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[b462670] | 128 | this.__cor.starter = NULL; |
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[242a902] | 129 | this.proc = proc; |
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| 130 | proc->runner = &this; |
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[8def349] | 131 | } |
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| 132 | |
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[39fea2f] | 133 | // Construct the processor context of non-main processors |
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[242a902] | 134 | void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) { |
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| 135 | (this.__cor){ info }; |
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| 136 | this.proc = proc; |
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| 137 | proc->runner = &this; |
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[8def349] | 138 | } |
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| 139 | |
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[242a902] | 140 | void ?{}(processor & this) { |
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[969b3fe] | 141 | this{ mainCluster }; |
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[8def349] | 142 | } |
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| 143 | |
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[242a902] | 144 | void ?{}(processor & this, cluster * cltr) { |
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| 145 | this.cltr = cltr; |
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[65deb18] | 146 | this.terminated{ 0 }; |
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[9236060] | 147 | this.do_terminate = false; |
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[242a902] | 148 | this.preemption_alarm = NULL; |
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| 149 | this.pending_preemption = false; |
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[8def349] | 150 | |
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[242a902] | 151 | start( &this ); |
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[c84e80a] | 152 | } |
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| 153 | |
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[83a071f9] | 154 | void ?{}(processor & this, cluster * cltr, processorCtx_t & runner) { |
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[242a902] | 155 | this.cltr = cltr; |
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[65deb18] | 156 | this.terminated{ 0 }; |
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[9236060] | 157 | this.do_terminate = false; |
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[242a902] | 158 | this.preemption_alarm = NULL; |
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| 159 | this.pending_preemption = false; |
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| 160 | this.kernel_thread = pthread_self(); |
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[8def349] | 161 | |
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[83a071f9] | 162 | this.runner = &runner; |
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[36982fc] | 163 | __cfaabi_dbg_print_safe("Kernel : constructing main processor context %p\n", &runner); |
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[83a071f9] | 164 | runner{ &this }; |
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[8def349] | 165 | } |
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| 166 | |
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[65deb18] | 167 | void ^?{}(processor & this) with( this ){ |
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| 168 | if( ! do_terminate ) { |
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[36982fc] | 169 | __cfaabi_dbg_print_safe("Kernel : core %p signaling termination\n", &this); |
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[4dad189] | 170 | terminate(&this); |
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[65deb18] | 171 | P( terminated ); |
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| 172 | pthread_join( kernel_thread, NULL ); |
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[8def349] | 173 | } |
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| 174 | } |
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| 175 | |
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[65deb18] | 176 | void ?{}(cluster & this) with( this ) { |
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| 177 | ready_queue{}; |
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| 178 | ready_queue_lock{}; |
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[e60e0dc] | 179 | |
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[65deb18] | 180 | preemption = default_preemption(); |
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[8def349] | 181 | } |
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| 182 | |
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[242a902] | 183 | void ^?{}(cluster & this) { |
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[1c273d0] | 184 | |
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[c84e80a] | 185 | } |
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| 186 | |
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[75f3522] | 187 | //============================================================================================= |
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| 188 | // Kernel Scheduling logic |
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| 189 | //============================================================================================= |
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[8fcbb4c] | 190 | //Main of the processor contexts |
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[83a071f9] | 191 | void main(processorCtx_t & runner) { |
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| 192 | processor * this = runner.proc; |
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[c81ebf9] | 193 | |
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[36982fc] | 194 | __cfaabi_dbg_print_safe("Kernel : core %p starting\n", this); |
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[8118303] | 195 | |
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[75f3522] | 196 | { |
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[c81ebf9] | 197 | // Setup preemption data |
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| 198 | preemption_scope scope = { this }; |
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| 199 | |
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[36982fc] | 200 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
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[8118303] | 201 | |
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[c81ebf9] | 202 | thread_desc * readyThread = NULL; |
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[e60e0dc] | 203 | for( unsigned int spin_count = 0; ! this->do_terminate; spin_count++ ) |
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[75f3522] | 204 | { |
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[c81ebf9] | 205 | readyThread = nextThread( this->cltr ); |
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[75f3522] | 206 | |
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[c81ebf9] | 207 | if(readyThread) |
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| 208 | { |
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[d0a045c7] | 209 | verify( !preemption_enabled ); |
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[4e6fb8e] | 210 | |
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[c81ebf9] | 211 | runThread(this, readyThread); |
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[75f3522] | 212 | |
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[d0a045c7] | 213 | verify( !preemption_enabled ); |
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[4e6fb8e] | 214 | |
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[c81ebf9] | 215 | //Some actions need to be taken from the kernel |
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| 216 | finishRunning(this); |
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| 217 | |
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| 218 | spin_count = 0; |
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| 219 | } |
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| 220 | else |
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| 221 | { |
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| 222 | spin(this, &spin_count); |
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| 223 | } |
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| 224 | } |
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| 225 | |
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[36982fc] | 226 | __cfaabi_dbg_print_safe("Kernel : core %p stopping\n", this); |
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[c84e80a] | 227 | } |
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[8118303] | 228 | |
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[4cedd9f] | 229 | V( this->terminated ); |
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[bdeba0b] | 230 | |
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[36982fc] | 231 | __cfaabi_dbg_print_safe("Kernel : core %p terminated\n", this); |
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[c84e80a] | 232 | } |
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| 233 | |
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[1c273d0] | 234 | // runThread runs a thread by context switching |
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| 235 | // from the processor coroutine to the target thread |
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[348006f] | 236 | void runThread(processor * this, thread_desc * dst) { |
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[82c948c] | 237 | assert(dst->curr_cor); |
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[83a071f9] | 238 | coroutine_desc * proc_cor = get_coroutine(*this->runner); |
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[82c948c] | 239 | coroutine_desc * thrd_cor = dst->curr_cor; |
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[1c273d0] | 240 | |
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[75f3522] | 241 | //Reset the terminating actions here |
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[db6f06a] | 242 | this->finish.action_code = No_Action; |
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[8fcbb4c] | 243 | |
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[75f3522] | 244 | //Update global state |
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[1c273d0] | 245 | this_thread = dst; |
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[75f3522] | 246 | |
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| 247 | // Context Switch to the thread |
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| 248 | ThreadCtxSwitch(proc_cor, thrd_cor); |
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| 249 | // when ThreadCtxSwitch returns we are back in the processor coroutine |
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| 250 | } |
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| 251 | |
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[82c948c] | 252 | void returnToKernel() { |
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| 253 | coroutine_desc * proc_cor = get_coroutine(*this_processor->runner); |
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| 254 | coroutine_desc * thrd_cor = this_thread->curr_cor = this_coroutine; |
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| 255 | ThreadCtxSwitch(thrd_cor, proc_cor); |
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| 256 | } |
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| 257 | |
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[1c273d0] | 258 | // Once a thread has finished running, some of |
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[75f3522] | 259 | // its final actions must be executed from the kernel |
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[65deb18] | 260 | void finishRunning(processor * this) with( this->finish ) { |
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| 261 | if( action_code == Release ) { |
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[d0a045c7] | 262 | verify( !preemption_enabled ); |
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[65deb18] | 263 | unlock( *lock ); |
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[db6f06a] | 264 | } |
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[65deb18] | 265 | else if( action_code == Schedule ) { |
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| 266 | ScheduleThread( thrd ); |
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[db6f06a] | 267 | } |
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[65deb18] | 268 | else if( action_code == Release_Schedule ) { |
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[d0a045c7] | 269 | verify( !preemption_enabled ); |
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[65deb18] | 270 | unlock( *lock ); |
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| 271 | ScheduleThread( thrd ); |
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[db6f06a] | 272 | } |
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[65deb18] | 273 | else if( action_code == Release_Multi ) { |
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[d0a045c7] | 274 | verify( !preemption_enabled ); |
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[65deb18] | 275 | for(int i = 0; i < lock_count; i++) { |
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| 276 | unlock( *locks[i] ); |
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[0c78741] | 277 | } |
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| 278 | } |
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[65deb18] | 279 | else if( action_code == Release_Multi_Schedule ) { |
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| 280 | for(int i = 0; i < lock_count; i++) { |
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| 281 | unlock( *locks[i] ); |
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[0c78741] | 282 | } |
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[65deb18] | 283 | for(int i = 0; i < thrd_count; i++) { |
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| 284 | ScheduleThread( thrds[i] ); |
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[0c78741] | 285 | } |
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| 286 | } |
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[db6f06a] | 287 | else { |
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[65deb18] | 288 | assert(action_code == No_Action); |
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[8fcbb4c] | 289 | } |
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[c84e80a] | 290 | } |
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| 291 | |
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[0c92c9f] | 292 | // Handles spinning logic |
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| 293 | // TODO : find some strategy to put cores to sleep after some time |
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[c84e80a] | 294 | void spin(processor * this, unsigned int * spin_count) { |
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| 295 | (*spin_count)++; |
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| 296 | } |
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| 297 | |
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[0c92c9f] | 298 | // Context invoker for processors |
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| 299 | // This is the entry point for processors (kernel threads) |
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| 300 | // It effectively constructs a coroutine by stealing the pthread stack |
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[8def349] | 301 | void * CtxInvokeProcessor(void * arg) { |
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| 302 | processor * proc = (processor *) arg; |
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| 303 | this_processor = proc; |
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[1c273d0] | 304 | this_coroutine = NULL; |
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| 305 | this_thread = NULL; |
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[d0a045c7] | 306 | preemption_enabled = false; |
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[4e6fb8e] | 307 | disable_preempt_count = 1; |
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[8def349] | 308 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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| 309 | // which is needed for the 2-step context switch. However, there is no reason |
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[1c273d0] | 310 | // to waste the perfectly valid stack create by pthread. |
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[8def349] | 311 | current_stack_info_t info; |
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| 312 | machine_context_t ctx; |
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| 313 | info.context = &ctx; |
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| 314 | processorCtx_t proc_cor_storage = { proc, &info }; |
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| 315 | |
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[36982fc] | 316 | __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", proc_cor_storage.__cor.stack.base); |
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[8fcbb4c] | 317 | |
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[0c92c9f] | 318 | //Set global state |
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[1c273d0] | 319 | this_coroutine = &proc->runner->__cor; |
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| 320 | this_thread = NULL; |
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[8def349] | 321 | |
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| 322 | //We now have a proper context from which to schedule threads |
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[36982fc] | 323 | __cfaabi_dbg_print_safe("Kernel : core %p created (%p, %p)\n", proc, proc->runner, &ctx); |
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[8def349] | 324 | |
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[1c273d0] | 325 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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| 326 | // resume it to start it like it normally would, it will just context switch |
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| 327 | // back to here. Instead directly call the main since we already are on the |
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[8def349] | 328 | // appropriate stack. |
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[17af7d1] | 329 | proc_cor_storage.__cor.state = Active; |
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[83a071f9] | 330 | main( proc_cor_storage ); |
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[4aa2fb2] | 331 | proc_cor_storage.__cor.state = Halted; |
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[8def349] | 332 | |
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[0c92c9f] | 333 | // Main routine of the core returned, the core is now fully terminated |
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[36982fc] | 334 | __cfaabi_dbg_print_safe("Kernel : core %p main ended (%p)\n", proc, proc->runner); |
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[8def349] | 335 | |
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| 336 | return NULL; |
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[c84e80a] | 337 | } |
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| 338 | |
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[8def349] | 339 | void start(processor * this) { |
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[36982fc] | 340 | __cfaabi_dbg_print_safe("Kernel : Starting core %p\n", this); |
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[82ff5845] | 341 | |
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[8fcbb4c] | 342 | pthread_create( &this->kernel_thread, NULL, CtxInvokeProcessor, (void*)this ); |
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[eb2e723] | 343 | |
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[36982fc] | 344 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
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[eb2e723] | 345 | } |
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| 346 | |
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[8def349] | 347 | //----------------------------------------------------------------------------- |
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| 348 | // Scheduler routines |
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[348006f] | 349 | void ScheduleThread( thread_desc * thrd ) { |
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[1c273d0] | 350 | // if( !thrd ) return; |
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[135b431] | 351 | verify( thrd ); |
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[b18830e] | 352 | verify( thrd->self_cor.state != Halted ); |
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[1c273d0] | 353 | |
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[d0a045c7] | 354 | verify( !preemption_enabled ); |
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[690f13c] | 355 | |
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[4aa2fb2] | 356 | verifyf( thrd->next == NULL, "Expected null got %p", thrd->next ); |
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[1c273d0] | 357 | |
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[65deb18] | 358 | with( *this_processor->cltr ) { |
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| 359 | lock ( ready_queue_lock __cfaabi_dbg_ctx2 ); |
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| 360 | append( ready_queue, thrd ); |
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| 361 | unlock( ready_queue_lock ); |
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| 362 | } |
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[1c273d0] | 363 | |
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[d0a045c7] | 364 | verify( !preemption_enabled ); |
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[db6f06a] | 365 | } |
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| 366 | |
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[65deb18] | 367 | thread_desc * nextThread(cluster * this) with( *this ) { |
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[d0a045c7] | 368 | verify( !preemption_enabled ); |
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[65deb18] | 369 | lock( ready_queue_lock __cfaabi_dbg_ctx2 ); |
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| 370 | thread_desc * head = pop_head( ready_queue ); |
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| 371 | unlock( ready_queue_lock ); |
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[d0a045c7] | 372 | verify( !preemption_enabled ); |
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[db6f06a] | 373 | return head; |
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[eb2e723] | 374 | } |
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| 375 | |
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[82ff5845] | 376 | void BlockInternal() { |
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| 377 | disable_interrupts(); |
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[d0a045c7] | 378 | verify( !preemption_enabled ); |
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[82c948c] | 379 | returnToKernel(); |
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[d0a045c7] | 380 | verify( !preemption_enabled ); |
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[36982fc] | 381 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[75f3522] | 382 | } |
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| 383 | |
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[ea7d2b0] | 384 | void BlockInternal( __spinlock_t * lock ) { |
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[82ff5845] | 385 | disable_interrupts(); |
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[89a3df5] | 386 | this_processor->finish.action_code = Release; |
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[65deb18] | 387 | this_processor->finish.lock = lock; |
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[0b33412] | 388 | |
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[d0a045c7] | 389 | verify( !preemption_enabled ); |
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[82c948c] | 390 | returnToKernel(); |
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[d0a045c7] | 391 | verify( !preemption_enabled ); |
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[0b33412] | 392 | |
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[36982fc] | 393 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[db6f06a] | 394 | } |
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| 395 | |
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[82ff5845] | 396 | void BlockInternal( thread_desc * thrd ) { |
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| 397 | disable_interrupts(); |
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[89a3df5] | 398 | this_processor->finish.action_code = Schedule; |
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[65deb18] | 399 | this_processor->finish.thrd = thrd; |
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[0b33412] | 400 | |
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[d0a045c7] | 401 | verify( !preemption_enabled ); |
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[82c948c] | 402 | returnToKernel(); |
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[d0a045c7] | 403 | verify( !preemption_enabled ); |
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[0b33412] | 404 | |
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[36982fc] | 405 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[db6f06a] | 406 | } |
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| 407 | |
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[ea7d2b0] | 408 | void BlockInternal( __spinlock_t * lock, thread_desc * thrd ) { |
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[97e3296] | 409 | assert(thrd); |
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[82ff5845] | 410 | disable_interrupts(); |
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[89a3df5] | 411 | this_processor->finish.action_code = Release_Schedule; |
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[65deb18] | 412 | this_processor->finish.lock = lock; |
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| 413 | this_processor->finish.thrd = thrd; |
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[0b33412] | 414 | |
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[d0a045c7] | 415 | verify( !preemption_enabled ); |
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[82c948c] | 416 | returnToKernel(); |
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[d0a045c7] | 417 | verify( !preemption_enabled ); |
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[0b33412] | 418 | |
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[36982fc] | 419 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[eb2e723] | 420 | } |
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| 421 | |
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[ea7d2b0] | 422 | void BlockInternal(__spinlock_t * locks [], unsigned short count) { |
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[82ff5845] | 423 | disable_interrupts(); |
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[0c78741] | 424 | this_processor->finish.action_code = Release_Multi; |
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[65deb18] | 425 | this_processor->finish.locks = locks; |
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| 426 | this_processor->finish.lock_count = count; |
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[0b33412] | 427 | |
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[d0a045c7] | 428 | verify( !preemption_enabled ); |
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[82c948c] | 429 | returnToKernel(); |
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[d0a045c7] | 430 | verify( !preemption_enabled ); |
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[0b33412] | 431 | |
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[36982fc] | 432 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[0c78741] | 433 | } |
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| 434 | |
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[ea7d2b0] | 435 | void BlockInternal(__spinlock_t * locks [], unsigned short lock_count, thread_desc * thrds [], unsigned short thrd_count) { |
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[82ff5845] | 436 | disable_interrupts(); |
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[0c78741] | 437 | this_processor->finish.action_code = Release_Multi_Schedule; |
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[65deb18] | 438 | this_processor->finish.locks = locks; |
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| 439 | this_processor->finish.lock_count = lock_count; |
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| 440 | this_processor->finish.thrds = thrds; |
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| 441 | this_processor->finish.thrd_count = thrd_count; |
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[0b33412] | 442 | |
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[d0a045c7] | 443 | verify( !preemption_enabled ); |
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[82c948c] | 444 | returnToKernel(); |
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[d0a045c7] | 445 | verify( !preemption_enabled ); |
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[0b33412] | 446 | |
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[36982fc] | 447 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[0c78741] | 448 | } |
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| 449 | |
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[ea7d2b0] | 450 | void LeaveThread(__spinlock_t * lock, thread_desc * thrd) { |
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[d0a045c7] | 451 | verify( !preemption_enabled ); |
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[f2b12406] | 452 | this_processor->finish.action_code = thrd ? Release_Schedule : Release; |
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[65deb18] | 453 | this_processor->finish.lock = lock; |
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| 454 | this_processor->finish.thrd = thrd; |
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[f2b12406] | 455 | |
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[82c948c] | 456 | returnToKernel(); |
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[f2b12406] | 457 | } |
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| 458 | |
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[fa21ac9] | 459 | //============================================================================================= |
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| 460 | // Kernel Setup logic |
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| 461 | //============================================================================================= |
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[eb2e723] | 462 | //----------------------------------------------------------------------------- |
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| 463 | // Kernel boot procedures |
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| 464 | void kernel_startup(void) { |
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[36982fc] | 465 | __cfaabi_dbg_print_safe("Kernel : Starting\n"); |
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[eb2e723] | 466 | |
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| 467 | // Start by initializing the main thread |
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[1c273d0] | 468 | // SKULLDUGGERY: the mainThread steals the process main thread |
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[969b3fe] | 469 | // which will then be scheduled by the mainProcessor normally |
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| 470 | mainThread = (thread_desc *)&storage_mainThread; |
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[8fcbb4c] | 471 | current_stack_info_t info; |
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[83a071f9] | 472 | (*mainThread){ &info }; |
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[eb2e723] | 473 | |
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[36982fc] | 474 | __cfaabi_dbg_print_safe("Kernel : Main thread ready\n"); |
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[fa21ac9] | 475 | |
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[969b3fe] | 476 | // Initialize the main cluster |
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| 477 | mainCluster = (cluster *)&storage_mainCluster; |
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[9236060] | 478 | (*mainCluster){}; |
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[bd98b58] | 479 | |
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[36982fc] | 480 | __cfaabi_dbg_print_safe("Kernel : main cluster ready\n"); |
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[fa21ac9] | 481 | |
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[969b3fe] | 482 | // Initialize the main processor and the main processor ctx |
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[eb2e723] | 483 | // (the coroutine that contains the processing control flow) |
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[969b3fe] | 484 | mainProcessor = (processor *)&storage_mainProcessor; |
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[9236060] | 485 | (*mainProcessor){ mainCluster, *(processorCtx_t *)&storage_mainProcessorCtx }; |
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[eb2e723] | 486 | |
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[dcb42b8] | 487 | //initialize the global state variables |
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[969b3fe] | 488 | this_processor = mainProcessor; |
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[1c273d0] | 489 | this_thread = mainThread; |
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[b18830e] | 490 | this_coroutine = &mainThread->self_cor; |
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[eb2e723] | 491 | |
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[82ff5845] | 492 | // Enable preemption |
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| 493 | kernel_start_preemption(); |
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| 494 | |
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[969b3fe] | 495 | // Add the main thread to the ready queue |
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| 496 | // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread |
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| 497 | ScheduleThread(mainThread); |
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| 498 | |
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| 499 | // 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] | 500 | // context. Hence, the main thread does not begin through CtxInvokeThread, like all other threads. The trick here is that |
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[1c273d0] | 501 | // mainThread is on the ready queue when this call is made. |
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[9236060] | 502 | resume( *mainProcessor->runner ); |
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[eb2e723] | 503 | |
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[dcb42b8] | 504 | |
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| 505 | |
---|
| 506 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
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[36982fc] | 507 | __cfaabi_dbg_print_safe("Kernel : Started\n--------------------------------------------------\n\n"); |
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[82ff5845] | 508 | |
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[36982fc] | 509 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[eb2e723] | 510 | } |
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| 511 | |
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[dcb42b8] | 512 | void kernel_shutdown(void) { |
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[36982fc] | 513 | __cfaabi_dbg_print_safe("\n--------------------------------------------------\nKernel : Shutting down\n"); |
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[eb2e723] | 514 | |
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[4e6fb8e] | 515 | disable_interrupts(); |
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| 516 | |
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[969b3fe] | 517 | // SKULLDUGGERY: Notify the mainProcessor it needs to terminates. |
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[dcb42b8] | 518 | // When its coroutine terminates, it return control to the mainThread |
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| 519 | // which is currently here |
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[969b3fe] | 520 | mainProcessor->do_terminate = true; |
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[82c948c] | 521 | returnToKernel(); |
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[eb2e723] | 522 | |
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[dcb42b8] | 523 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
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[eb2e723] | 524 | |
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[82ff5845] | 525 | // Disable preemption |
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| 526 | kernel_stop_preemption(); |
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| 527 | |
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[969b3fe] | 528 | // Destroy the main processor and its context in reverse order of construction |
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[dcb42b8] | 529 | // These were manually constructed so we need manually destroy them |
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[9236060] | 530 | ^(*mainProcessor->runner){}; |
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[969b3fe] | 531 | ^(mainProcessor){}; |
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[eb2e723] | 532 | |
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[dcb42b8] | 533 | // Final step, destroy the main thread since it is no longer needed |
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| 534 | // Since we provided a stack to this taxk it will not destroy anything |
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[eb2e723] | 535 | ^(mainThread){}; |
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| 536 | |
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[36982fc] | 537 | __cfaabi_dbg_print_safe("Kernel : Shutdown complete\n"); |
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[9d944b2] | 538 | } |
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| 539 | |
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[dbe9b08] | 540 | //============================================================================================= |
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| 541 | // Unexpected Terminating logic |
---|
| 542 | //============================================================================================= |
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| 543 | |
---|
| 544 | |
---|
[ea7d2b0] | 545 | static __spinlock_t kernel_abort_lock; |
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| 546 | static __spinlock_t kernel_debug_lock; |
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[9d944b2] | 547 | static bool kernel_abort_called = false; |
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| 548 | |
---|
| 549 | void * kernel_abort (void) __attribute__ ((__nothrow__)) { |
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| 550 | // abort cannot be recursively entered by the same or different processors because all signal handlers return when |
---|
| 551 | // the globalAbort flag is true. |
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[36982fc] | 552 | lock( kernel_abort_lock __cfaabi_dbg_ctx2 ); |
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[9d944b2] | 553 | |
---|
| 554 | // first task to abort ? |
---|
| 555 | if ( !kernel_abort_called ) { // not first task to abort ? |
---|
| 556 | kernel_abort_called = true; |
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[ea7d2b0] | 557 | unlock( kernel_abort_lock ); |
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[1c273d0] | 558 | } |
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[9d944b2] | 559 | else { |
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[ea7d2b0] | 560 | unlock( kernel_abort_lock ); |
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[1c273d0] | 561 | |
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[9d944b2] | 562 | sigset_t mask; |
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| 563 | sigemptyset( &mask ); |
---|
| 564 | sigaddset( &mask, SIGALRM ); // block SIGALRM signals |
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| 565 | sigaddset( &mask, SIGUSR1 ); // block SIGUSR1 signals |
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| 566 | sigsuspend( &mask ); // block the processor to prevent further damage during abort |
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[1c273d0] | 567 | _exit( EXIT_FAILURE ); // if processor unblocks before it is killed, terminate it |
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[9d944b2] | 568 | } |
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| 569 | |
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[1c273d0] | 570 | return this_thread; |
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[9d944b2] | 571 | } |
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| 572 | |
---|
| 573 | void kernel_abort_msg( void * kernel_data, char * abort_text, int abort_text_size ) { |
---|
| 574 | thread_desc * thrd = kernel_data; |
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| 575 | |
---|
[b18830e] | 576 | 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] | 577 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
[9d944b2] | 578 | |
---|
[1c273d0] | 579 | if ( thrd != this_coroutine ) { |
---|
| 580 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", this_coroutine->name, this_coroutine ); |
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[36982fc] | 581 | __cfaabi_dbg_bits_write( abort_text, len ); |
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[1c273d0] | 582 | } |
---|
[9d944b2] | 583 | else { |
---|
[36982fc] | 584 | __cfaabi_dbg_bits_write( ".\n", 2 ); |
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[9d944b2] | 585 | } |
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| 586 | } |
---|
| 587 | |
---|
[2b8bc41] | 588 | int kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
| 589 | return get_coroutine(this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
| 590 | } |
---|
| 591 | |
---|
[9d944b2] | 592 | extern "C" { |
---|
[36982fc] | 593 | void __cfaabi_dbg_bits_acquire() { |
---|
| 594 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 595 | } |
---|
| 596 | |
---|
[36982fc] | 597 | void __cfaabi_dbg_bits_release() { |
---|
[ea7d2b0] | 598 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 599 | } |
---|
[8118303] | 600 | } |
---|
| 601 | |
---|
[fa21ac9] | 602 | //============================================================================================= |
---|
| 603 | // Kernel Utilities |
---|
| 604 | //============================================================================================= |
---|
[bd98b58] | 605 | //----------------------------------------------------------------------------- |
---|
| 606 | // Locks |
---|
[242a902] | 607 | void ?{}( semaphore & this, int count = 1 ) { |
---|
| 608 | (this.lock){}; |
---|
| 609 | this.count = count; |
---|
| 610 | (this.waiting){}; |
---|
[db6f06a] | 611 | } |
---|
[242a902] | 612 | void ^?{}(semaphore & this) {} |
---|
[db6f06a] | 613 | |
---|
[65deb18] | 614 | void P(semaphore & this) with( this ){ |
---|
| 615 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 616 | count -= 1; |
---|
| 617 | if ( count < 0 ) { |
---|
[bdeba0b] | 618 | // queue current task |
---|
[65deb18] | 619 | append( waiting, (thread_desc *)this_thread ); |
---|
[bdeba0b] | 620 | |
---|
| 621 | // atomically release spin lock and block |
---|
[65deb18] | 622 | BlockInternal( &lock ); |
---|
[8def349] | 623 | } |
---|
[4e6fb8e] | 624 | else { |
---|
[65deb18] | 625 | unlock( lock ); |
---|
[4e6fb8e] | 626 | } |
---|
[bd98b58] | 627 | } |
---|
| 628 | |
---|
[65deb18] | 629 | void V(semaphore & this) with( this ) { |
---|
[bdeba0b] | 630 | thread_desc * thrd = NULL; |
---|
[65deb18] | 631 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 632 | count += 1; |
---|
| 633 | if ( count <= 0 ) { |
---|
[bdeba0b] | 634 | // remove task at head of waiting list |
---|
[65deb18] | 635 | thrd = pop_head( waiting ); |
---|
[bd98b58] | 636 | } |
---|
[bdeba0b] | 637 | |
---|
[65deb18] | 638 | unlock( lock ); |
---|
[bdeba0b] | 639 | |
---|
| 640 | // make new owner |
---|
| 641 | WakeThread( thrd ); |
---|
[bd98b58] | 642 | } |
---|
| 643 | |
---|
[f7d6bb0] | 644 | //----------------------------------------------------------------------------- |
---|
| 645 | // Debug |
---|
| 646 | __cfaabi_dbg_debug_do( |
---|
| 647 | struct { |
---|
| 648 | thread_desc * tail; |
---|
| 649 | } __cfaabi_dbg_thread_list = { NULL }; |
---|
| 650 | |
---|
| 651 | void __cfaabi_dbg_thread_register( thread_desc * thrd ) { |
---|
| 652 | if( !__cfaabi_dbg_thread_list.tail ) { |
---|
| 653 | __cfaabi_dbg_thread_list.tail = thrd; |
---|
| 654 | return; |
---|
| 655 | } |
---|
| 656 | __cfaabi_dbg_thread_list.tail->dbg_next = thrd; |
---|
| 657 | thrd->dbg_prev = __cfaabi_dbg_thread_list.tail; |
---|
| 658 | __cfaabi_dbg_thread_list.tail = thrd; |
---|
| 659 | } |
---|
| 660 | |
---|
| 661 | void __cfaabi_dbg_thread_unregister( thread_desc * thrd ) { |
---|
| 662 | thread_desc * prev = thrd->dbg_prev; |
---|
| 663 | thread_desc * next = thrd->dbg_next; |
---|
| 664 | |
---|
| 665 | if( next ) { next->dbg_prev = prev; } |
---|
| 666 | else { |
---|
| 667 | assert( __cfaabi_dbg_thread_list.tail == thrd ); |
---|
| 668 | __cfaabi_dbg_thread_list.tail = prev; |
---|
| 669 | } |
---|
| 670 | |
---|
| 671 | if( prev ) { prev->dbg_next = next; } |
---|
| 672 | |
---|
| 673 | thrd->dbg_prev = NULL; |
---|
| 674 | thrd->dbg_next = NULL; |
---|
| 675 | } |
---|
| 676 | ) |
---|
[8118303] | 677 | // Local Variables: // |
---|
| 678 | // mode: c // |
---|
| 679 | // tab-width: 4 // |
---|
| 680 | // End: // |
---|