[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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[0f56058] | 12 | // Last Modified On : Mon Apr 9 16:11:46 2018 |
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| 13 | // Update Count : 24 |
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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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[0f56058] | 27 | #include "time" |
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[2ac095d] | 28 | #include "kernel_private.h" |
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[c81ebf9] | 29 | #include "preemption.h" |
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[2ac095d] | 30 | #include "startup.h" |
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[8118303] | 31 | |
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| 32 | //Private includes |
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| 33 | #define __CFA_INVOKE_PRIVATE__ |
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| 34 | #include "invoke.h" |
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| 35 | |
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[2ac095d] | 36 | //Start and stop routine for the kernel, declared first to make sure they run first |
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| 37 | void kernel_startup(void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) )); |
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| 38 | void kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) )); |
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| 39 | |
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[8def349] | 40 | //----------------------------------------------------------------------------- |
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| 41 | // Kernel storage |
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[969b3fe] | 42 | KERNEL_STORAGE(cluster, mainCluster); |
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| 43 | KERNEL_STORAGE(processor, mainProcessor); |
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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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[de6319f] | 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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[de94a60] | 51 | struct { __dllist_t(thread_desc) list; __spinlock_t lock; } global_threads ; |
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| 52 | struct { __dllist_t(cluster ) list; __spinlock_t lock; } global_clusters; |
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| 53 | |
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[bd98b58] | 54 | //----------------------------------------------------------------------------- |
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| 55 | // Global state |
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| 56 | |
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[b69ea6b] | 57 | // volatile thread_local bool preemption_in_progress = 0; |
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| 58 | // volatile thread_local bool preemption_enabled = false; |
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| 59 | // volatile thread_local unsigned short disable_preempt_count = 1; |
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| 60 | |
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[14a61b5] | 61 | thread_local struct KernelThreadData kernelTLS = { |
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[b10affd] | 62 | NULL, |
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| 63 | NULL, |
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| 64 | NULL, |
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| 65 | { 1, false, false } |
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| 66 | }; |
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[c84e80a] | 67 | |
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| 68 | //----------------------------------------------------------------------------- |
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[de6319f] | 69 | // Struct to steal stack |
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[8def349] | 70 | struct current_stack_info_t { |
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[1c273d0] | 71 | machine_context_t ctx; |
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[8def349] | 72 | unsigned int size; // size of stack |
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| 73 | void *base; // base of stack |
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| 74 | void *storage; // pointer to stack |
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| 75 | void *limit; // stack grows towards stack limit |
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| 76 | void *context; // address of cfa_context_t |
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| 77 | void *top; // address of top of storage |
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[c84e80a] | 78 | }; |
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| 79 | |
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[242a902] | 80 | void ?{}( current_stack_info_t & this ) { |
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| 81 | CtxGet( this.ctx ); |
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| 82 | this.base = this.ctx.FP; |
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| 83 | this.storage = this.ctx.SP; |
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[8def349] | 84 | |
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| 85 | rlimit r; |
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[132fad4] | 86 | getrlimit( RLIMIT_STACK, &r); |
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[242a902] | 87 | this.size = r.rlim_cur; |
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[8def349] | 88 | |
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[242a902] | 89 | this.limit = (void *)(((intptr_t)this.base) - this.size); |
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[9236060] | 90 | this.context = &storage_mainThreadCtx; |
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[242a902] | 91 | this.top = this.base; |
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[8def349] | 92 | } |
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| 93 | |
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[de6319f] | 94 | //----------------------------------------------------------------------------- |
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| 95 | // Main thread construction |
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[65deb18] | 96 | void ?{}( coStack_t & this, current_stack_info_t * info) with( this ) { |
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| 97 | size = info->size; |
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| 98 | storage = info->storage; |
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| 99 | limit = info->limit; |
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| 100 | base = info->base; |
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| 101 | context = info->context; |
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| 102 | top = info->top; |
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| 103 | userStack = true; |
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[8def349] | 104 | } |
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| 105 | |
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[65deb18] | 106 | void ?{}( coroutine_desc & this, current_stack_info_t * info) with( this ) { |
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| 107 | stack{ info }; |
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| 108 | name = "Main Thread"; |
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| 109 | errno_ = 0; |
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| 110 | state = Start; |
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| 111 | starter = NULL; |
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[8def349] | 112 | } |
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| 113 | |
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[65deb18] | 114 | void ?{}( thread_desc & this, current_stack_info_t * info) with( this ) { |
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| 115 | self_cor{ info }; |
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[82c948c] | 116 | curr_cor = &self_cor; |
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[de6319f] | 117 | curr_cluster = mainCluster; |
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[82c948c] | 118 | self_mon.owner = &this; |
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| 119 | self_mon.recursion = 1; |
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| 120 | self_mon_p = &self_mon; |
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| 121 | next = NULL; |
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[de94a60] | 122 | |
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| 123 | node.next = NULL; |
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| 124 | node.prev = NULL; |
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| 125 | doregister(this); |
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[82c948c] | 126 | |
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| 127 | monitors{ &self_mon_p, 1, (fptr_t)0 }; |
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[8def349] | 128 | } |
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[c84e80a] | 129 | |
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[8def349] | 130 | //----------------------------------------------------------------------------- |
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| 131 | // Processor coroutine |
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[de6319f] | 132 | void ?{}(processorCtx_t & this) { |
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[39fea2f] | 133 | |
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[8def349] | 134 | } |
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| 135 | |
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[39fea2f] | 136 | // Construct the processor context of non-main processors |
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[242a902] | 137 | void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) { |
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| 138 | (this.__cor){ info }; |
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| 139 | this.proc = proc; |
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[8def349] | 140 | } |
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| 141 | |
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[de6319f] | 142 | void ?{}(processor & this, const char * name, cluster & cltr) with( this ) { |
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| 143 | this.name = name; |
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| 144 | this.cltr = &cltr; |
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[c40e7c5] | 145 | terminated{ 0 }; |
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| 146 | do_terminate = false; |
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| 147 | preemption_alarm = NULL; |
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| 148 | pending_preemption = false; |
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[094476d] | 149 | runner.proc = &this; |
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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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[65deb18] | 154 | void ^?{}(processor & this) with( this ){ |
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| 155 | if( ! do_terminate ) { |
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[36982fc] | 156 | __cfaabi_dbg_print_safe("Kernel : core %p signaling termination\n", &this); |
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[4dad189] | 157 | terminate(&this); |
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[1f37ed02] | 158 | verify(this.do_terminate); |
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[14a61b5] | 159 | verify( kernelTLS.this_processor != &this); |
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[65deb18] | 160 | P( terminated ); |
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[14a61b5] | 161 | verify( kernelTLS.this_processor != &this); |
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[65deb18] | 162 | pthread_join( kernel_thread, NULL ); |
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[8def349] | 163 | } |
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| 164 | } |
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| 165 | |
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[de6319f] | 166 | void ?{}(cluster & this, const char * name, Duration preemption_rate) with( this ) { |
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| 167 | this.name = name; |
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| 168 | this.preemption_rate = preemption_rate; |
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[65deb18] | 169 | ready_queue{}; |
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| 170 | ready_queue_lock{}; |
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[de94a60] | 171 | |
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| 172 | procs{ __get }; |
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| 173 | idles{ __get }; |
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| 174 | |
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| 175 | doregister(this); |
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[8def349] | 176 | } |
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| 177 | |
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[242a902] | 178 | void ^?{}(cluster & this) { |
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[de94a60] | 179 | unregister(this); |
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[c84e80a] | 180 | } |
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| 181 | |
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[75f3522] | 182 | //============================================================================================= |
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| 183 | // Kernel Scheduling logic |
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| 184 | //============================================================================================= |
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[8fcbb4c] | 185 | //Main of the processor contexts |
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[83a071f9] | 186 | void main(processorCtx_t & runner) { |
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| 187 | processor * this = runner.proc; |
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[094476d] | 188 | verify(this); |
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[c81ebf9] | 189 | |
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[36982fc] | 190 | __cfaabi_dbg_print_safe("Kernel : core %p starting\n", this); |
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[8118303] | 191 | |
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[de94a60] | 192 | doregister(this->cltr, this); |
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| 193 | |
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[75f3522] | 194 | { |
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[c81ebf9] | 195 | // Setup preemption data |
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| 196 | preemption_scope scope = { this }; |
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| 197 | |
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[36982fc] | 198 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
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[8118303] | 199 | |
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[c81ebf9] | 200 | thread_desc * readyThread = NULL; |
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[e60e0dc] | 201 | for( unsigned int spin_count = 0; ! this->do_terminate; spin_count++ ) |
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[75f3522] | 202 | { |
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[c81ebf9] | 203 | readyThread = nextThread( this->cltr ); |
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[75f3522] | 204 | |
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[c81ebf9] | 205 | if(readyThread) |
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| 206 | { |
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[14a61b5] | 207 | verify( ! kernelTLS.preemption_state.enabled ); |
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[4e6fb8e] | 208 | |
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[c81ebf9] | 209 | runThread(this, readyThread); |
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[75f3522] | 210 | |
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[14a61b5] | 211 | verify( ! kernelTLS.preemption_state.enabled ); |
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[4e6fb8e] | 212 | |
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[c81ebf9] | 213 | //Some actions need to be taken from the kernel |
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| 214 | finishRunning(this); |
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| 215 | |
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| 216 | spin_count = 0; |
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| 217 | } |
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| 218 | else |
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| 219 | { |
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| 220 | spin(this, &spin_count); |
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| 221 | } |
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| 222 | } |
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| 223 | |
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[36982fc] | 224 | __cfaabi_dbg_print_safe("Kernel : core %p stopping\n", this); |
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[c84e80a] | 225 | } |
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[8118303] | 226 | |
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[de94a60] | 227 | unregister(this->cltr, this); |
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| 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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[14a61b5] | 234 | // KERNEL ONLY |
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[1c273d0] | 235 | // runThread runs a thread by context switching |
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| 236 | // from the processor coroutine to the target thread |
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[348006f] | 237 | void runThread(processor * this, thread_desc * dst) { |
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[82c948c] | 238 | assert(dst->curr_cor); |
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[094476d] | 239 | coroutine_desc * proc_cor = get_coroutine(this->runner); |
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[82c948c] | 240 | coroutine_desc * thrd_cor = dst->curr_cor; |
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[1c273d0] | 241 | |
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[14a61b5] | 242 | // Reset the terminating actions here |
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[db6f06a] | 243 | this->finish.action_code = No_Action; |
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[8fcbb4c] | 244 | |
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[14a61b5] | 245 | // Update global state |
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| 246 | kernelTLS.this_thread = dst; |
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[75f3522] | 247 | |
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| 248 | // Context Switch to the thread |
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| 249 | ThreadCtxSwitch(proc_cor, thrd_cor); |
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| 250 | // when ThreadCtxSwitch returns we are back in the processor coroutine |
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| 251 | } |
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| 252 | |
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[14a61b5] | 253 | // KERNEL_ONLY |
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[82c948c] | 254 | void returnToKernel() { |
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[14a61b5] | 255 | coroutine_desc * proc_cor = get_coroutine(kernelTLS.this_processor->runner); |
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| 256 | coroutine_desc * thrd_cor = kernelTLS.this_thread->curr_cor = kernelTLS.this_coroutine; |
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[82c948c] | 257 | ThreadCtxSwitch(thrd_cor, proc_cor); |
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| 258 | } |
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| 259 | |
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[14a61b5] | 260 | // KERNEL_ONLY |
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[1c273d0] | 261 | // Once a thread has finished running, some of |
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[75f3522] | 262 | // its final actions must be executed from the kernel |
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[65deb18] | 263 | void finishRunning(processor * this) with( this->finish ) { |
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| 264 | if( action_code == Release ) { |
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[14a61b5] | 265 | verify( ! kernelTLS.preemption_state.enabled ); |
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[65deb18] | 266 | unlock( *lock ); |
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[db6f06a] | 267 | } |
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[65deb18] | 268 | else if( action_code == Schedule ) { |
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| 269 | ScheduleThread( thrd ); |
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[db6f06a] | 270 | } |
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[65deb18] | 271 | else if( action_code == Release_Schedule ) { |
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[14a61b5] | 272 | verify( ! kernelTLS.preemption_state.enabled ); |
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[65deb18] | 273 | unlock( *lock ); |
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| 274 | ScheduleThread( thrd ); |
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[db6f06a] | 275 | } |
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[65deb18] | 276 | else if( action_code == Release_Multi ) { |
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[14a61b5] | 277 | verify( ! kernelTLS.preemption_state.enabled ); |
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[65deb18] | 278 | for(int i = 0; i < lock_count; i++) { |
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| 279 | unlock( *locks[i] ); |
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[0c78741] | 280 | } |
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| 281 | } |
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[65deb18] | 282 | else if( action_code == Release_Multi_Schedule ) { |
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| 283 | for(int i = 0; i < lock_count; i++) { |
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| 284 | unlock( *locks[i] ); |
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[0c78741] | 285 | } |
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[65deb18] | 286 | for(int i = 0; i < thrd_count; i++) { |
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| 287 | ScheduleThread( thrds[i] ); |
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[0c78741] | 288 | } |
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| 289 | } |
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[db6f06a] | 290 | else { |
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[65deb18] | 291 | assert(action_code == No_Action); |
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[8fcbb4c] | 292 | } |
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[c84e80a] | 293 | } |
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| 294 | |
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[0c92c9f] | 295 | // Handles spinning logic |
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| 296 | // TODO : find some strategy to put cores to sleep after some time |
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[c84e80a] | 297 | void spin(processor * this, unsigned int * spin_count) { |
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| 298 | (*spin_count)++; |
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| 299 | } |
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| 300 | |
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[14a61b5] | 301 | // KERNEL_ONLY |
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[0c92c9f] | 302 | // Context invoker for processors |
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| 303 | // This is the entry point for processors (kernel threads) |
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| 304 | // It effectively constructs a coroutine by stealing the pthread stack |
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[8def349] | 305 | void * CtxInvokeProcessor(void * arg) { |
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| 306 | processor * proc = (processor *) arg; |
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[14a61b5] | 307 | kernelTLS.this_processor = proc; |
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| 308 | kernelTLS.this_coroutine = NULL; |
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| 309 | kernelTLS.this_thread = NULL; |
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| 310 | kernelTLS.preemption_state.[enabled, disable_count] = [false, 1]; |
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[8def349] | 311 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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| 312 | // which is needed for the 2-step context switch. However, there is no reason |
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[1c273d0] | 313 | // to waste the perfectly valid stack create by pthread. |
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[8def349] | 314 | current_stack_info_t info; |
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| 315 | machine_context_t ctx; |
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| 316 | info.context = &ctx; |
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[094476d] | 317 | (proc->runner){ proc, &info }; |
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[8def349] | 318 | |
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[094476d] | 319 | __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.base); |
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[8fcbb4c] | 320 | |
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[0c92c9f] | 321 | //Set global state |
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[14a61b5] | 322 | kernelTLS.this_coroutine = get_coroutine(proc->runner); |
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| 323 | kernelTLS.this_thread = NULL; |
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[8def349] | 324 | |
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| 325 | //We now have a proper context from which to schedule threads |
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[094476d] | 326 | __cfaabi_dbg_print_safe("Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx); |
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[8def349] | 327 | |
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[1c273d0] | 328 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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| 329 | // resume it to start it like it normally would, it will just context switch |
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| 330 | // back to here. Instead directly call the main since we already are on the |
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[8def349] | 331 | // appropriate stack. |
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[094476d] | 332 | get_coroutine(proc->runner)->state = Active; |
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| 333 | main( proc->runner ); |
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| 334 | get_coroutine(proc->runner)->state = Halted; |
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[8def349] | 335 | |
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[0c92c9f] | 336 | // Main routine of the core returned, the core is now fully terminated |
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[094476d] | 337 | __cfaabi_dbg_print_safe("Kernel : core %p main ended (%p)\n", proc, &proc->runner); |
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[8def349] | 338 | |
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| 339 | return NULL; |
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[c84e80a] | 340 | } |
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| 341 | |
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[8def349] | 342 | void start(processor * this) { |
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[36982fc] | 343 | __cfaabi_dbg_print_safe("Kernel : Starting core %p\n", this); |
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[82ff5845] | 344 | |
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[8fcbb4c] | 345 | pthread_create( &this->kernel_thread, NULL, CtxInvokeProcessor, (void*)this ); |
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[eb2e723] | 346 | |
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[36982fc] | 347 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
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[eb2e723] | 348 | } |
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| 349 | |
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[14a61b5] | 350 | // KERNEL_ONLY |
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[b69ea6b] | 351 | void kernel_first_resume(processor * this) { |
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[14a61b5] | 352 | coroutine_desc * src = kernelTLS.this_coroutine; |
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[094476d] | 353 | coroutine_desc * dst = get_coroutine(this->runner); |
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[b69ea6b] | 354 | |
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[14a61b5] | 355 | verify( ! kernelTLS.preemption_state.enabled ); |
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[b69ea6b] | 356 | |
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| 357 | create_stack(&dst->stack, dst->stack.size); |
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[094476d] | 358 | CtxStart(&this->runner, CtxInvokeCoroutine); |
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[b69ea6b] | 359 | |
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[14a61b5] | 360 | verify( ! kernelTLS.preemption_state.enabled ); |
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[b69ea6b] | 361 | |
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| 362 | dst->last = src; |
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| 363 | dst->starter = dst->starter ? dst->starter : src; |
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| 364 | |
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| 365 | // set state of current coroutine to inactive |
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| 366 | src->state = src->state == Halted ? Halted : Inactive; |
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| 367 | |
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| 368 | // set new coroutine that task is executing |
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[14a61b5] | 369 | kernelTLS.this_coroutine = dst; |
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[b69ea6b] | 370 | |
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| 371 | // SKULLDUGGERY normally interrupts are enable before leaving a coroutine ctxswitch. |
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| 372 | // Therefore, when first creating a coroutine, interrupts are enable before calling the main. |
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| 373 | // This is consistent with thread creation. However, when creating the main processor coroutine, |
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| 374 | // we wan't interrupts to be disabled. Therefore, we double-disable interrupts here so they will |
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| 375 | // stay disabled. |
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| 376 | disable_interrupts(); |
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| 377 | |
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| 378 | // context switch to specified coroutine |
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| 379 | assert( src->stack.context ); |
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| 380 | CtxSwitch( src->stack.context, dst->stack.context ); |
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| 381 | // when CtxSwitch returns we are back in the src coroutine |
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| 382 | |
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| 383 | // set state of new coroutine to active |
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| 384 | src->state = Active; |
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| 385 | |
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[14a61b5] | 386 | verify( ! kernelTLS.preemption_state.enabled ); |
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[b69ea6b] | 387 | } |
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| 388 | |
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[8def349] | 389 | //----------------------------------------------------------------------------- |
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| 390 | // Scheduler routines |
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[14a61b5] | 391 | |
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| 392 | // KERNEL ONLY |
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[348006f] | 393 | void ScheduleThread( thread_desc * thrd ) { |
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[135b431] | 394 | verify( thrd ); |
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[b18830e] | 395 | verify( thrd->self_cor.state != Halted ); |
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[1c273d0] | 396 | |
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[14a61b5] | 397 | verify( ! kernelTLS.preemption_state.enabled ); |
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[690f13c] | 398 | |
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[4aa2fb2] | 399 | verifyf( thrd->next == NULL, "Expected null got %p", thrd->next ); |
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[1c273d0] | 400 | |
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[de6319f] | 401 | with( *thrd->curr_cluster ) { |
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[65deb18] | 402 | lock ( ready_queue_lock __cfaabi_dbg_ctx2 ); |
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| 403 | append( ready_queue, thrd ); |
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| 404 | unlock( ready_queue_lock ); |
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| 405 | } |
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[1c273d0] | 406 | |
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[14a61b5] | 407 | verify( ! kernelTLS.preemption_state.enabled ); |
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[db6f06a] | 408 | } |
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| 409 | |
---|
[14a61b5] | 410 | // KERNEL ONLY |
---|
[65deb18] | 411 | thread_desc * nextThread(cluster * this) with( *this ) { |
---|
[14a61b5] | 412 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[65deb18] | 413 | lock( ready_queue_lock __cfaabi_dbg_ctx2 ); |
---|
| 414 | thread_desc * head = pop_head( ready_queue ); |
---|
| 415 | unlock( ready_queue_lock ); |
---|
[14a61b5] | 416 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[db6f06a] | 417 | return head; |
---|
[eb2e723] | 418 | } |
---|
| 419 | |
---|
[82ff5845] | 420 | void BlockInternal() { |
---|
| 421 | disable_interrupts(); |
---|
[14a61b5] | 422 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 423 | returnToKernel(); |
---|
[14a61b5] | 424 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[36982fc] | 425 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[75f3522] | 426 | } |
---|
| 427 | |
---|
[ea7d2b0] | 428 | void BlockInternal( __spinlock_t * lock ) { |
---|
[82ff5845] | 429 | disable_interrupts(); |
---|
[14a61b5] | 430 | with( *kernelTLS.this_processor ) { |
---|
[de6319f] | 431 | finish.action_code = Release; |
---|
| 432 | finish.lock = lock; |
---|
| 433 | } |
---|
[0b33412] | 434 | |
---|
[afd550c] | 435 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 436 | returnToKernel(); |
---|
[afd550c] | 437 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 438 | |
---|
[36982fc] | 439 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[db6f06a] | 440 | } |
---|
| 441 | |
---|
[82ff5845] | 442 | void BlockInternal( thread_desc * thrd ) { |
---|
| 443 | disable_interrupts(); |
---|
[14a61b5] | 444 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 445 | finish.action_code = Schedule; |
---|
| 446 | finish.thrd = thrd; |
---|
| 447 | } |
---|
[0b33412] | 448 | |
---|
[14a61b5] | 449 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 450 | returnToKernel(); |
---|
[14a61b5] | 451 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 452 | |
---|
[36982fc] | 453 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[db6f06a] | 454 | } |
---|
| 455 | |
---|
[ea7d2b0] | 456 | void BlockInternal( __spinlock_t * lock, thread_desc * thrd ) { |
---|
[97e3296] | 457 | assert(thrd); |
---|
[82ff5845] | 458 | disable_interrupts(); |
---|
[14a61b5] | 459 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 460 | finish.action_code = Release_Schedule; |
---|
| 461 | finish.lock = lock; |
---|
| 462 | finish.thrd = thrd; |
---|
| 463 | } |
---|
[0b33412] | 464 | |
---|
[14a61b5] | 465 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 466 | returnToKernel(); |
---|
[14a61b5] | 467 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 468 | |
---|
[36982fc] | 469 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[eb2e723] | 470 | } |
---|
| 471 | |
---|
[ea7d2b0] | 472 | void BlockInternal(__spinlock_t * locks [], unsigned short count) { |
---|
[82ff5845] | 473 | disable_interrupts(); |
---|
[14a61b5] | 474 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 475 | finish.action_code = Release_Multi; |
---|
| 476 | finish.locks = locks; |
---|
| 477 | finish.lock_count = count; |
---|
| 478 | } |
---|
[0b33412] | 479 | |
---|
[14a61b5] | 480 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 481 | returnToKernel(); |
---|
[14a61b5] | 482 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 483 | |
---|
[36982fc] | 484 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[0c78741] | 485 | } |
---|
| 486 | |
---|
[ea7d2b0] | 487 | void BlockInternal(__spinlock_t * locks [], unsigned short lock_count, thread_desc * thrds [], unsigned short thrd_count) { |
---|
[82ff5845] | 488 | disable_interrupts(); |
---|
[14a61b5] | 489 | with( *kernelTLS.this_processor ) { |
---|
[de6319f] | 490 | finish.action_code = Release_Multi_Schedule; |
---|
| 491 | finish.locks = locks; |
---|
| 492 | finish.lock_count = lock_count; |
---|
| 493 | finish.thrds = thrds; |
---|
| 494 | finish.thrd_count = thrd_count; |
---|
| 495 | } |
---|
[0b33412] | 496 | |
---|
[14a61b5] | 497 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 498 | returnToKernel(); |
---|
[14a61b5] | 499 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 500 | |
---|
[36982fc] | 501 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[0c78741] | 502 | } |
---|
| 503 | |
---|
[14a61b5] | 504 | // KERNEL ONLY |
---|
[ea7d2b0] | 505 | void LeaveThread(__spinlock_t * lock, thread_desc * thrd) { |
---|
[14a61b5] | 506 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
| 507 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 508 | finish.action_code = thrd ? Release_Schedule : Release; |
---|
| 509 | finish.lock = lock; |
---|
| 510 | finish.thrd = thrd; |
---|
| 511 | } |
---|
[f2b12406] | 512 | |
---|
[82c948c] | 513 | returnToKernel(); |
---|
[f2b12406] | 514 | } |
---|
| 515 | |
---|
[fa21ac9] | 516 | //============================================================================================= |
---|
| 517 | // Kernel Setup logic |
---|
| 518 | //============================================================================================= |
---|
[eb2e723] | 519 | //----------------------------------------------------------------------------- |
---|
| 520 | // Kernel boot procedures |
---|
| 521 | void kernel_startup(void) { |
---|
[14a61b5] | 522 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[36982fc] | 523 | __cfaabi_dbg_print_safe("Kernel : Starting\n"); |
---|
[eb2e723] | 524 | |
---|
[de94a60] | 525 | global_threads. list{ __get }; |
---|
| 526 | global_threads. lock{}; |
---|
| 527 | global_clusters.list{ __get }; |
---|
| 528 | global_clusters.lock{}; |
---|
| 529 | |
---|
[de6319f] | 530 | // Initialize the main cluster |
---|
| 531 | mainCluster = (cluster *)&storage_mainCluster; |
---|
| 532 | (*mainCluster){"Main Cluster"}; |
---|
| 533 | |
---|
| 534 | __cfaabi_dbg_print_safe("Kernel : Main cluster ready\n"); |
---|
| 535 | |
---|
[eb2e723] | 536 | // Start by initializing the main thread |
---|
[1c273d0] | 537 | // SKULLDUGGERY: the mainThread steals the process main thread |
---|
[969b3fe] | 538 | // which will then be scheduled by the mainProcessor normally |
---|
| 539 | mainThread = (thread_desc *)&storage_mainThread; |
---|
[8fcbb4c] | 540 | current_stack_info_t info; |
---|
[83a071f9] | 541 | (*mainThread){ &info }; |
---|
[eb2e723] | 542 | |
---|
[36982fc] | 543 | __cfaabi_dbg_print_safe("Kernel : Main thread ready\n"); |
---|
[fa21ac9] | 544 | |
---|
[bd98b58] | 545 | |
---|
[de6319f] | 546 | |
---|
| 547 | // Construct the processor context of the main processor |
---|
| 548 | void ?{}(processorCtx_t & this, processor * proc) { |
---|
| 549 | (this.__cor){ "Processor" }; |
---|
| 550 | this.__cor.starter = NULL; |
---|
| 551 | this.proc = proc; |
---|
| 552 | } |
---|
| 553 | |
---|
| 554 | void ?{}(processor & this) with( this ) { |
---|
| 555 | name = "Main Processor"; |
---|
| 556 | cltr = mainCluster; |
---|
| 557 | terminated{ 0 }; |
---|
| 558 | do_terminate = false; |
---|
| 559 | preemption_alarm = NULL; |
---|
| 560 | pending_preemption = false; |
---|
| 561 | kernel_thread = pthread_self(); |
---|
| 562 | |
---|
| 563 | runner{ &this }; |
---|
| 564 | __cfaabi_dbg_print_safe("Kernel : constructed main processor context %p\n", &runner); |
---|
| 565 | } |
---|
[fa21ac9] | 566 | |
---|
[969b3fe] | 567 | // Initialize the main processor and the main processor ctx |
---|
[eb2e723] | 568 | // (the coroutine that contains the processing control flow) |
---|
[969b3fe] | 569 | mainProcessor = (processor *)&storage_mainProcessor; |
---|
[de6319f] | 570 | (*mainProcessor){}; |
---|
[eb2e723] | 571 | |
---|
[dcb42b8] | 572 | //initialize the global state variables |
---|
[14a61b5] | 573 | kernelTLS.this_processor = mainProcessor; |
---|
| 574 | kernelTLS.this_thread = mainThread; |
---|
| 575 | kernelTLS.this_coroutine = &mainThread->self_cor; |
---|
[eb2e723] | 576 | |
---|
[82ff5845] | 577 | // Enable preemption |
---|
| 578 | kernel_start_preemption(); |
---|
| 579 | |
---|
[969b3fe] | 580 | // Add the main thread to the ready queue |
---|
| 581 | // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread |
---|
| 582 | ScheduleThread(mainThread); |
---|
| 583 | |
---|
| 584 | // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX |
---|
[dcb42b8] | 585 | // context. Hence, the main thread does not begin through CtxInvokeThread, like all other threads. The trick here is that |
---|
[1c273d0] | 586 | // mainThread is on the ready queue when this call is made. |
---|
[14a61b5] | 587 | kernel_first_resume( kernelTLS.this_processor ); |
---|
[eb2e723] | 588 | |
---|
[dcb42b8] | 589 | |
---|
| 590 | |
---|
| 591 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
---|
[36982fc] | 592 | __cfaabi_dbg_print_safe("Kernel : Started\n--------------------------------------------------\n\n"); |
---|
[82ff5845] | 593 | |
---|
[14a61b5] | 594 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[36982fc] | 595 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[afd550c] | 596 | verify( TL_GET( preemption_state.enabled ) ); |
---|
[eb2e723] | 597 | } |
---|
| 598 | |
---|
[dcb42b8] | 599 | void kernel_shutdown(void) { |
---|
[36982fc] | 600 | __cfaabi_dbg_print_safe("\n--------------------------------------------------\nKernel : Shutting down\n"); |
---|
[eb2e723] | 601 | |
---|
[afd550c] | 602 | verify( TL_GET( preemption_state.enabled ) ); |
---|
[4e6fb8e] | 603 | disable_interrupts(); |
---|
[14a61b5] | 604 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[4e6fb8e] | 605 | |
---|
[969b3fe] | 606 | // SKULLDUGGERY: Notify the mainProcessor it needs to terminates. |
---|
[dcb42b8] | 607 | // When its coroutine terminates, it return control to the mainThread |
---|
| 608 | // which is currently here |
---|
[969b3fe] | 609 | mainProcessor->do_terminate = true; |
---|
[82c948c] | 610 | returnToKernel(); |
---|
[eb2e723] | 611 | |
---|
[dcb42b8] | 612 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
---|
[eb2e723] | 613 | |
---|
[82ff5845] | 614 | // Disable preemption |
---|
| 615 | kernel_stop_preemption(); |
---|
| 616 | |
---|
[969b3fe] | 617 | // Destroy the main processor and its context in reverse order of construction |
---|
[dcb42b8] | 618 | // These were manually constructed so we need manually destroy them |
---|
[094476d] | 619 | ^(mainProcessor->runner){}; |
---|
[969b3fe] | 620 | ^(mainProcessor){}; |
---|
[eb2e723] | 621 | |
---|
[dcb42b8] | 622 | // Final step, destroy the main thread since it is no longer needed |
---|
| 623 | // Since we provided a stack to this taxk it will not destroy anything |
---|
[eb2e723] | 624 | ^(mainThread){}; |
---|
| 625 | |
---|
[36982fc] | 626 | __cfaabi_dbg_print_safe("Kernel : Shutdown complete\n"); |
---|
[9d944b2] | 627 | } |
---|
| 628 | |
---|
[14a61b5] | 629 | //============================================================================================= |
---|
| 630 | // Kernel Quiescing |
---|
| 631 | //============================================================================================= |
---|
| 632 | |
---|
| 633 | // void halt(processor * this) with( this ) { |
---|
| 634 | // pthread_mutex_lock( &idle.lock ); |
---|
| 635 | |
---|
| 636 | |
---|
| 637 | |
---|
| 638 | // // SKULLDUGGERY: Even if spurious wake-up is a thing |
---|
| 639 | // // spuriously waking up a kernel thread is not a big deal |
---|
| 640 | // // if it is very rare. |
---|
| 641 | // pthread_cond_wait( &idle.cond, &idle.lock); |
---|
| 642 | // pthread_mutex_unlock( &idle.lock ); |
---|
| 643 | // } |
---|
| 644 | |
---|
| 645 | // void wake(processor * this) with( this ) { |
---|
| 646 | // pthread_mutex_lock (&idle.lock); |
---|
| 647 | // pthread_cond_signal (&idle.cond); |
---|
| 648 | // pthread_mutex_unlock(&idle.lock); |
---|
| 649 | // } |
---|
| 650 | |
---|
[dbe9b08] | 651 | //============================================================================================= |
---|
| 652 | // Unexpected Terminating logic |
---|
| 653 | //============================================================================================= |
---|
| 654 | |
---|
| 655 | |
---|
[ea7d2b0] | 656 | static __spinlock_t kernel_abort_lock; |
---|
[9d944b2] | 657 | static bool kernel_abort_called = false; |
---|
| 658 | |
---|
[afd550c] | 659 | void * kernel_abort(void) __attribute__ ((__nothrow__)) { |
---|
[9d944b2] | 660 | // abort cannot be recursively entered by the same or different processors because all signal handlers return when |
---|
| 661 | // the globalAbort flag is true. |
---|
[36982fc] | 662 | lock( kernel_abort_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 663 | |
---|
| 664 | // first task to abort ? |
---|
[de94a60] | 665 | if ( kernel_abort_called ) { // not first task to abort ? |
---|
[ea7d2b0] | 666 | unlock( kernel_abort_lock ); |
---|
[1c273d0] | 667 | |
---|
[9d944b2] | 668 | sigset_t mask; |
---|
| 669 | sigemptyset( &mask ); |
---|
[de94a60] | 670 | sigaddset( &mask, SIGALRM ); // block SIGALRM signals |
---|
| 671 | sigsuspend( &mask ); // block the processor to prevent further damage during abort |
---|
| 672 | _exit( EXIT_FAILURE ); // if processor unblocks before it is killed, terminate it |
---|
| 673 | } |
---|
| 674 | else { |
---|
| 675 | kernel_abort_called = true; |
---|
| 676 | unlock( kernel_abort_lock ); |
---|
[9d944b2] | 677 | } |
---|
| 678 | |
---|
[14a61b5] | 679 | return kernelTLS.this_thread; |
---|
[9d944b2] | 680 | } |
---|
| 681 | |
---|
| 682 | void kernel_abort_msg( void * kernel_data, char * abort_text, int abort_text_size ) { |
---|
| 683 | thread_desc * thrd = kernel_data; |
---|
| 684 | |
---|
[de94a60] | 685 | if(thrd) { |
---|
| 686 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd ); |
---|
[36982fc] | 687 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
[de94a60] | 688 | |
---|
| 689 | if ( get_coroutine(thrd) != kernelTLS.this_coroutine ) { |
---|
| 690 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", kernelTLS.this_coroutine->name, kernelTLS.this_coroutine ); |
---|
| 691 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
| 692 | } |
---|
| 693 | else { |
---|
| 694 | __cfaabi_dbg_bits_write( ".\n", 2 ); |
---|
| 695 | } |
---|
[1c273d0] | 696 | } |
---|
[9d944b2] | 697 | else { |
---|
[de94a60] | 698 | int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" ); |
---|
[9d944b2] | 699 | } |
---|
| 700 | } |
---|
| 701 | |
---|
[2b8bc41] | 702 | int kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
[14a61b5] | 703 | return get_coroutine(kernelTLS.this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
[2b8bc41] | 704 | } |
---|
| 705 | |
---|
[de94a60] | 706 | static __spinlock_t kernel_debug_lock; |
---|
| 707 | |
---|
[9d944b2] | 708 | extern "C" { |
---|
[36982fc] | 709 | void __cfaabi_dbg_bits_acquire() { |
---|
| 710 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 711 | } |
---|
| 712 | |
---|
[36982fc] | 713 | void __cfaabi_dbg_bits_release() { |
---|
[ea7d2b0] | 714 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 715 | } |
---|
[8118303] | 716 | } |
---|
| 717 | |
---|
[fa21ac9] | 718 | //============================================================================================= |
---|
| 719 | // Kernel Utilities |
---|
| 720 | //============================================================================================= |
---|
[bd98b58] | 721 | //----------------------------------------------------------------------------- |
---|
| 722 | // Locks |
---|
[242a902] | 723 | void ?{}( semaphore & this, int count = 1 ) { |
---|
| 724 | (this.lock){}; |
---|
| 725 | this.count = count; |
---|
| 726 | (this.waiting){}; |
---|
[db6f06a] | 727 | } |
---|
[242a902] | 728 | void ^?{}(semaphore & this) {} |
---|
[db6f06a] | 729 | |
---|
[65deb18] | 730 | void P(semaphore & this) with( this ){ |
---|
| 731 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 732 | count -= 1; |
---|
| 733 | if ( count < 0 ) { |
---|
[bdeba0b] | 734 | // queue current task |
---|
[14a61b5] | 735 | append( waiting, kernelTLS.this_thread ); |
---|
[bdeba0b] | 736 | |
---|
| 737 | // atomically release spin lock and block |
---|
[65deb18] | 738 | BlockInternal( &lock ); |
---|
[8def349] | 739 | } |
---|
[4e6fb8e] | 740 | else { |
---|
[65deb18] | 741 | unlock( lock ); |
---|
[4e6fb8e] | 742 | } |
---|
[bd98b58] | 743 | } |
---|
| 744 | |
---|
[65deb18] | 745 | void V(semaphore & this) with( this ) { |
---|
[bdeba0b] | 746 | thread_desc * thrd = NULL; |
---|
[65deb18] | 747 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 748 | count += 1; |
---|
| 749 | if ( count <= 0 ) { |
---|
[bdeba0b] | 750 | // remove task at head of waiting list |
---|
[65deb18] | 751 | thrd = pop_head( waiting ); |
---|
[bd98b58] | 752 | } |
---|
[bdeba0b] | 753 | |
---|
[65deb18] | 754 | unlock( lock ); |
---|
[bdeba0b] | 755 | |
---|
| 756 | // make new owner |
---|
| 757 | WakeThread( thrd ); |
---|
[bd98b58] | 758 | } |
---|
| 759 | |
---|
[f7d6bb0] | 760 | //----------------------------------------------------------------------------- |
---|
[de94a60] | 761 | // Global Queues |
---|
| 762 | void doregister( thread_desc & thrd ) { |
---|
| 763 | // lock ( global_thread.lock ); |
---|
| 764 | // push_front( global_thread.list, thrd ); |
---|
| 765 | // unlock ( global_thread.lock ); |
---|
| 766 | } |
---|
[f7d6bb0] | 767 | |
---|
[de94a60] | 768 | void unregister( thread_desc & thrd ) { |
---|
| 769 | // lock ( global_thread.lock ); |
---|
| 770 | // remove( global_thread.list, thrd ); |
---|
| 771 | // unlock( global_thread.lock ); |
---|
| 772 | } |
---|
[f7d6bb0] | 773 | |
---|
[de94a60] | 774 | void doregister( cluster & cltr ) { |
---|
| 775 | // lock ( global_cluster.lock ); |
---|
| 776 | // push_front( global_cluster.list, cltr ); |
---|
| 777 | // unlock ( global_cluster.lock ); |
---|
| 778 | } |
---|
[f7d6bb0] | 779 | |
---|
[de94a60] | 780 | void unregister( cluster & cltr ) { |
---|
| 781 | // lock ( global_cluster.lock ); |
---|
| 782 | // remove( global_cluster.list, cltr ); |
---|
| 783 | // unlock( global_cluster.lock ); |
---|
| 784 | } |
---|
[f7d6bb0] | 785 | |
---|
[9181f1d] | 786 | |
---|
[de94a60] | 787 | void doregister( cluster * cltr, processor * proc ) { |
---|
| 788 | // lock (cltr->proc_list_lock __cfaabi_dbg_ctx2); |
---|
| 789 | // push_front(cltr->procs, *proc); |
---|
| 790 | // unlock (cltr->proc_list_lock); |
---|
| 791 | } |
---|
| 792 | |
---|
| 793 | void unregister( cluster * cltr, processor * proc ) { |
---|
| 794 | // lock (cltr->proc_list_lock __cfaabi_dbg_ctx2); |
---|
| 795 | // remove(cltr->procs, *proc ); |
---|
| 796 | // unlock(cltr->proc_list_lock); |
---|
| 797 | } |
---|
| 798 | |
---|
| 799 | //----------------------------------------------------------------------------- |
---|
| 800 | // Debug |
---|
| 801 | __cfaabi_dbg_debug_do( |
---|
[9181f1d] | 802 | void __cfaabi_dbg_record(__spinlock_t & this, const char * prev_name) { |
---|
| 803 | this.prev_name = prev_name; |
---|
[14a61b5] | 804 | this.prev_thrd = kernelTLS.this_thread; |
---|
[9181f1d] | 805 | } |
---|
[f7d6bb0] | 806 | ) |
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[8118303] | 807 | // Local Variables: // |
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| 808 | // mode: c // |
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| 809 | // tab-width: 4 // |
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| 810 | // End: // |
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