[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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[14a61b5] | 56 | thread_local struct KernelThreadData kernelTLS = { |
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[b10affd] | 57 | NULL, |
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| 58 | NULL, |
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| 59 | NULL, |
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| 60 | { 1, false, false } |
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| 61 | }; |
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[c84e80a] | 62 | |
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| 63 | //----------------------------------------------------------------------------- |
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[de6319f] | 64 | // Struct to steal stack |
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[8def349] | 65 | struct current_stack_info_t { |
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[1c273d0] | 66 | machine_context_t ctx; |
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[8def349] | 67 | unsigned int size; // size of stack |
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| 68 | void *base; // base of stack |
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| 69 | void *storage; // pointer to stack |
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| 70 | void *limit; // stack grows towards stack limit |
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| 71 | void *context; // address of cfa_context_t |
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| 72 | void *top; // address of top of storage |
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[c84e80a] | 73 | }; |
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| 74 | |
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[242a902] | 75 | void ?{}( current_stack_info_t & this ) { |
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| 76 | CtxGet( this.ctx ); |
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| 77 | this.base = this.ctx.FP; |
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| 78 | this.storage = this.ctx.SP; |
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[8def349] | 79 | |
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| 80 | rlimit r; |
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[132fad4] | 81 | getrlimit( RLIMIT_STACK, &r); |
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[242a902] | 82 | this.size = r.rlim_cur; |
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[8def349] | 83 | |
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[242a902] | 84 | this.limit = (void *)(((intptr_t)this.base) - this.size); |
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[9236060] | 85 | this.context = &storage_mainThreadCtx; |
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[242a902] | 86 | this.top = this.base; |
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[8def349] | 87 | } |
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| 88 | |
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[de6319f] | 89 | //----------------------------------------------------------------------------- |
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| 90 | // Main thread construction |
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[65deb18] | 91 | void ?{}( coStack_t & this, current_stack_info_t * info) with( this ) { |
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| 92 | size = info->size; |
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| 93 | storage = info->storage; |
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| 94 | limit = info->limit; |
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| 95 | base = info->base; |
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| 96 | context = info->context; |
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| 97 | top = info->top; |
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| 98 | userStack = true; |
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[8def349] | 99 | } |
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| 100 | |
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[65deb18] | 101 | void ?{}( coroutine_desc & this, current_stack_info_t * info) with( this ) { |
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| 102 | stack{ info }; |
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| 103 | name = "Main Thread"; |
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| 104 | errno_ = 0; |
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| 105 | state = Start; |
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| 106 | starter = NULL; |
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[8def349] | 107 | } |
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| 108 | |
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[65deb18] | 109 | void ?{}( thread_desc & this, current_stack_info_t * info) with( this ) { |
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| 110 | self_cor{ info }; |
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[82c948c] | 111 | curr_cor = &self_cor; |
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[de6319f] | 112 | curr_cluster = mainCluster; |
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[82c948c] | 113 | self_mon.owner = &this; |
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| 114 | self_mon.recursion = 1; |
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| 115 | self_mon_p = &self_mon; |
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| 116 | next = NULL; |
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[de94a60] | 117 | |
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| 118 | node.next = NULL; |
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| 119 | node.prev = NULL; |
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| 120 | doregister(this); |
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[82c948c] | 121 | |
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| 122 | monitors{ &self_mon_p, 1, (fptr_t)0 }; |
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[8def349] | 123 | } |
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[c84e80a] | 124 | |
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[8def349] | 125 | //----------------------------------------------------------------------------- |
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| 126 | // Processor coroutine |
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[de6319f] | 127 | void ?{}(processorCtx_t & this) { |
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[39fea2f] | 128 | |
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[8def349] | 129 | } |
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| 130 | |
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[39fea2f] | 131 | // Construct the processor context of non-main processors |
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[242a902] | 132 | void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) { |
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| 133 | (this.__cor){ info }; |
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| 134 | this.proc = proc; |
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[8def349] | 135 | } |
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| 136 | |
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[de6319f] | 137 | void ?{}(processor & this, const char * name, cluster & cltr) with( this ) { |
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| 138 | this.name = name; |
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| 139 | this.cltr = &cltr; |
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[c40e7c5] | 140 | terminated{ 0 }; |
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| 141 | do_terminate = false; |
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| 142 | preemption_alarm = NULL; |
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| 143 | pending_preemption = false; |
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[094476d] | 144 | runner.proc = &this; |
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[8def349] | 145 | |
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[242a902] | 146 | start( &this ); |
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[c84e80a] | 147 | } |
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| 148 | |
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[65deb18] | 149 | void ^?{}(processor & this) with( this ){ |
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| 150 | if( ! do_terminate ) { |
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[36982fc] | 151 | __cfaabi_dbg_print_safe("Kernel : core %p signaling termination\n", &this); |
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[4dad189] | 152 | terminate(&this); |
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[1f37ed02] | 153 | verify(this.do_terminate); |
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[14a61b5] | 154 | verify( kernelTLS.this_processor != &this); |
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[65deb18] | 155 | P( terminated ); |
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[14a61b5] | 156 | verify( kernelTLS.this_processor != &this); |
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[65deb18] | 157 | pthread_join( kernel_thread, NULL ); |
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[8def349] | 158 | } |
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| 159 | } |
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| 160 | |
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[de6319f] | 161 | void ?{}(cluster & this, const char * name, Duration preemption_rate) with( this ) { |
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| 162 | this.name = name; |
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| 163 | this.preemption_rate = preemption_rate; |
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[65deb18] | 164 | ready_queue{}; |
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| 165 | ready_queue_lock{}; |
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[de94a60] | 166 | |
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| 167 | procs{ __get }; |
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| 168 | idles{ __get }; |
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| 169 | |
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| 170 | doregister(this); |
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[8def349] | 171 | } |
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| 172 | |
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[242a902] | 173 | void ^?{}(cluster & this) { |
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[de94a60] | 174 | unregister(this); |
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[c84e80a] | 175 | } |
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| 176 | |
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[75f3522] | 177 | //============================================================================================= |
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| 178 | // Kernel Scheduling logic |
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| 179 | //============================================================================================= |
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[8fcbb4c] | 180 | //Main of the processor contexts |
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[83a071f9] | 181 | void main(processorCtx_t & runner) { |
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| 182 | processor * this = runner.proc; |
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[094476d] | 183 | verify(this); |
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[c81ebf9] | 184 | |
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[36982fc] | 185 | __cfaabi_dbg_print_safe("Kernel : core %p starting\n", this); |
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[8118303] | 186 | |
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[de94a60] | 187 | doregister(this->cltr, this); |
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| 188 | |
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[75f3522] | 189 | { |
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[c81ebf9] | 190 | // Setup preemption data |
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| 191 | preemption_scope scope = { this }; |
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| 192 | |
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[36982fc] | 193 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
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[8118303] | 194 | |
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[c81ebf9] | 195 | thread_desc * readyThread = NULL; |
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[e60e0dc] | 196 | for( unsigned int spin_count = 0; ! this->do_terminate; spin_count++ ) |
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[75f3522] | 197 | { |
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[c81ebf9] | 198 | readyThread = nextThread( this->cltr ); |
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[75f3522] | 199 | |
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[c81ebf9] | 200 | if(readyThread) |
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| 201 | { |
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[14a61b5] | 202 | verify( ! kernelTLS.preemption_state.enabled ); |
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[4e6fb8e] | 203 | |
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[c81ebf9] | 204 | runThread(this, readyThread); |
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[75f3522] | 205 | |
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[14a61b5] | 206 | verify( ! kernelTLS.preemption_state.enabled ); |
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[4e6fb8e] | 207 | |
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[c81ebf9] | 208 | //Some actions need to be taken from the kernel |
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| 209 | finishRunning(this); |
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| 210 | |
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| 211 | spin_count = 0; |
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| 212 | } |
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| 213 | else |
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| 214 | { |
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| 215 | spin(this, &spin_count); |
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| 216 | } |
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| 217 | } |
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| 218 | |
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[36982fc] | 219 | __cfaabi_dbg_print_safe("Kernel : core %p stopping\n", this); |
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[c84e80a] | 220 | } |
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[8118303] | 221 | |
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[de94a60] | 222 | unregister(this->cltr, this); |
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| 223 | |
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[4cedd9f] | 224 | V( this->terminated ); |
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[bdeba0b] | 225 | |
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[36982fc] | 226 | __cfaabi_dbg_print_safe("Kernel : core %p terminated\n", this); |
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[c84e80a] | 227 | } |
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| 228 | |
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[14a61b5] | 229 | // KERNEL ONLY |
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[1c273d0] | 230 | // runThread runs a thread by context switching |
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| 231 | // from the processor coroutine to the target thread |
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[348006f] | 232 | void runThread(processor * this, thread_desc * dst) { |
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[82c948c] | 233 | assert(dst->curr_cor); |
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[094476d] | 234 | coroutine_desc * proc_cor = get_coroutine(this->runner); |
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[82c948c] | 235 | coroutine_desc * thrd_cor = dst->curr_cor; |
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[1c273d0] | 236 | |
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[14a61b5] | 237 | // Reset the terminating actions here |
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[db6f06a] | 238 | this->finish.action_code = No_Action; |
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[8fcbb4c] | 239 | |
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[14a61b5] | 240 | // Update global state |
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| 241 | kernelTLS.this_thread = dst; |
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[75f3522] | 242 | |
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| 243 | // Context Switch to the thread |
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| 244 | ThreadCtxSwitch(proc_cor, thrd_cor); |
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| 245 | // when ThreadCtxSwitch returns we are back in the processor coroutine |
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| 246 | } |
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| 247 | |
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[14a61b5] | 248 | // KERNEL_ONLY |
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[82c948c] | 249 | void returnToKernel() { |
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[14a61b5] | 250 | coroutine_desc * proc_cor = get_coroutine(kernelTLS.this_processor->runner); |
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| 251 | coroutine_desc * thrd_cor = kernelTLS.this_thread->curr_cor = kernelTLS.this_coroutine; |
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[82c948c] | 252 | ThreadCtxSwitch(thrd_cor, proc_cor); |
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| 253 | } |
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| 254 | |
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[14a61b5] | 255 | // KERNEL_ONLY |
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[1c273d0] | 256 | // Once a thread has finished running, some of |
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[75f3522] | 257 | // its final actions must be executed from the kernel |
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[65deb18] | 258 | void finishRunning(processor * this) with( this->finish ) { |
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| 259 | if( action_code == Release ) { |
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[14a61b5] | 260 | verify( ! kernelTLS.preemption_state.enabled ); |
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[65deb18] | 261 | unlock( *lock ); |
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[db6f06a] | 262 | } |
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[65deb18] | 263 | else if( action_code == Schedule ) { |
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| 264 | ScheduleThread( thrd ); |
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[db6f06a] | 265 | } |
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[65deb18] | 266 | else if( action_code == Release_Schedule ) { |
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[14a61b5] | 267 | verify( ! kernelTLS.preemption_state.enabled ); |
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[65deb18] | 268 | unlock( *lock ); |
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| 269 | ScheduleThread( thrd ); |
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[db6f06a] | 270 | } |
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[65deb18] | 271 | else if( action_code == Release_Multi ) { |
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[14a61b5] | 272 | verify( ! kernelTLS.preemption_state.enabled ); |
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[65deb18] | 273 | for(int i = 0; i < lock_count; i++) { |
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| 274 | unlock( *locks[i] ); |
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[0c78741] | 275 | } |
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| 276 | } |
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[65deb18] | 277 | else if( action_code == Release_Multi_Schedule ) { |
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| 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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[65deb18] | 281 | for(int i = 0; i < thrd_count; i++) { |
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| 282 | ScheduleThread( thrds[i] ); |
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[0c78741] | 283 | } |
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| 284 | } |
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[db6f06a] | 285 | else { |
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[65deb18] | 286 | assert(action_code == No_Action); |
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[8fcbb4c] | 287 | } |
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[c84e80a] | 288 | } |
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| 289 | |
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[0c92c9f] | 290 | // Handles spinning logic |
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| 291 | // TODO : find some strategy to put cores to sleep after some time |
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[c84e80a] | 292 | void spin(processor * this, unsigned int * spin_count) { |
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| 293 | (*spin_count)++; |
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| 294 | } |
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| 295 | |
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[14a61b5] | 296 | // KERNEL_ONLY |
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[0c92c9f] | 297 | // Context invoker for processors |
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| 298 | // This is the entry point for processors (kernel threads) |
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| 299 | // It effectively constructs a coroutine by stealing the pthread stack |
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[8def349] | 300 | void * CtxInvokeProcessor(void * arg) { |
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| 301 | processor * proc = (processor *) arg; |
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[14a61b5] | 302 | kernelTLS.this_processor = proc; |
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| 303 | kernelTLS.this_coroutine = NULL; |
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| 304 | kernelTLS.this_thread = NULL; |
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| 305 | kernelTLS.preemption_state.[enabled, disable_count] = [false, 1]; |
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[8def349] | 306 | // SKULLDUGGERY: We want to create a context for the processor coroutine |
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| 307 | // which is needed for the 2-step context switch. However, there is no reason |
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[1c273d0] | 308 | // to waste the perfectly valid stack create by pthread. |
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[8def349] | 309 | current_stack_info_t info; |
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| 310 | machine_context_t ctx; |
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| 311 | info.context = &ctx; |
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[094476d] | 312 | (proc->runner){ proc, &info }; |
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[8def349] | 313 | |
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[094476d] | 314 | __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.base); |
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[8fcbb4c] | 315 | |
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[0c92c9f] | 316 | //Set global state |
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[14a61b5] | 317 | kernelTLS.this_coroutine = get_coroutine(proc->runner); |
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| 318 | kernelTLS.this_thread = NULL; |
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[8def349] | 319 | |
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| 320 | //We now have a proper context from which to schedule threads |
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[094476d] | 321 | __cfaabi_dbg_print_safe("Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx); |
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[8def349] | 322 | |
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[1c273d0] | 323 | // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't |
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| 324 | // resume it to start it like it normally would, it will just context switch |
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| 325 | // back to here. Instead directly call the main since we already are on the |
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[8def349] | 326 | // appropriate stack. |
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[094476d] | 327 | get_coroutine(proc->runner)->state = Active; |
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| 328 | main( proc->runner ); |
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| 329 | get_coroutine(proc->runner)->state = Halted; |
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[8def349] | 330 | |
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[0c92c9f] | 331 | // Main routine of the core returned, the core is now fully terminated |
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[094476d] | 332 | __cfaabi_dbg_print_safe("Kernel : core %p main ended (%p)\n", proc, &proc->runner); |
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[8def349] | 333 | |
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| 334 | return NULL; |
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[c84e80a] | 335 | } |
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| 336 | |
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[8def349] | 337 | void start(processor * this) { |
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[36982fc] | 338 | __cfaabi_dbg_print_safe("Kernel : Starting core %p\n", this); |
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[82ff5845] | 339 | |
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[8fcbb4c] | 340 | pthread_create( &this->kernel_thread, NULL, CtxInvokeProcessor, (void*)this ); |
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[eb2e723] | 341 | |
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[36982fc] | 342 | __cfaabi_dbg_print_safe("Kernel : core %p started\n", this); |
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[eb2e723] | 343 | } |
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| 344 | |
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[14a61b5] | 345 | // KERNEL_ONLY |
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[b69ea6b] | 346 | void kernel_first_resume(processor * this) { |
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[14a61b5] | 347 | coroutine_desc * src = kernelTLS.this_coroutine; |
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[094476d] | 348 | coroutine_desc * dst = get_coroutine(this->runner); |
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[b69ea6b] | 349 | |
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[14a61b5] | 350 | verify( ! kernelTLS.preemption_state.enabled ); |
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[b69ea6b] | 351 | |
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| 352 | create_stack(&dst->stack, dst->stack.size); |
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[094476d] | 353 | CtxStart(&this->runner, CtxInvokeCoroutine); |
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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 | dst->last = src; |
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| 358 | dst->starter = dst->starter ? dst->starter : src; |
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| 359 | |
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| 360 | // set state of current coroutine to inactive |
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| 361 | src->state = src->state == Halted ? Halted : Inactive; |
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| 362 | |
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| 363 | // set new coroutine that task is executing |
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[14a61b5] | 364 | kernelTLS.this_coroutine = dst; |
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[b69ea6b] | 365 | |
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| 366 | // SKULLDUGGERY normally interrupts are enable before leaving a coroutine ctxswitch. |
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| 367 | // Therefore, when first creating a coroutine, interrupts are enable before calling the main. |
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| 368 | // This is consistent with thread creation. However, when creating the main processor coroutine, |
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| 369 | // we wan't interrupts to be disabled. Therefore, we double-disable interrupts here so they will |
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| 370 | // stay disabled. |
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| 371 | disable_interrupts(); |
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| 372 | |
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| 373 | // context switch to specified coroutine |
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| 374 | assert( src->stack.context ); |
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| 375 | CtxSwitch( src->stack.context, dst->stack.context ); |
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| 376 | // when CtxSwitch returns we are back in the src coroutine |
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| 377 | |
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| 378 | // set state of new coroutine to active |
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| 379 | src->state = Active; |
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| 380 | |
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[14a61b5] | 381 | verify( ! kernelTLS.preemption_state.enabled ); |
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[b69ea6b] | 382 | } |
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| 383 | |
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[8def349] | 384 | //----------------------------------------------------------------------------- |
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| 385 | // Scheduler routines |
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[14a61b5] | 386 | |
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| 387 | // KERNEL ONLY |
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[348006f] | 388 | void ScheduleThread( thread_desc * thrd ) { |
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[135b431] | 389 | verify( thrd ); |
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[b18830e] | 390 | verify( thrd->self_cor.state != Halted ); |
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[1c273d0] | 391 | |
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[14a61b5] | 392 | verify( ! kernelTLS.preemption_state.enabled ); |
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[690f13c] | 393 | |
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[4aa2fb2] | 394 | verifyf( thrd->next == NULL, "Expected null got %p", thrd->next ); |
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[1c273d0] | 395 | |
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[de6319f] | 396 | with( *thrd->curr_cluster ) { |
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[65deb18] | 397 | lock ( ready_queue_lock __cfaabi_dbg_ctx2 ); |
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| 398 | append( ready_queue, thrd ); |
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| 399 | unlock( ready_queue_lock ); |
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| 400 | } |
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[1c273d0] | 401 | |
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[14a61b5] | 402 | verify( ! kernelTLS.preemption_state.enabled ); |
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[db6f06a] | 403 | } |
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| 404 | |
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[14a61b5] | 405 | // KERNEL ONLY |
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[65deb18] | 406 | thread_desc * nextThread(cluster * this) with( *this ) { |
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[14a61b5] | 407 | verify( ! kernelTLS.preemption_state.enabled ); |
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[65deb18] | 408 | lock( ready_queue_lock __cfaabi_dbg_ctx2 ); |
---|
| 409 | thread_desc * head = pop_head( ready_queue ); |
---|
| 410 | unlock( ready_queue_lock ); |
---|
[14a61b5] | 411 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[db6f06a] | 412 | return head; |
---|
[eb2e723] | 413 | } |
---|
| 414 | |
---|
[82ff5845] | 415 | void BlockInternal() { |
---|
| 416 | disable_interrupts(); |
---|
[14a61b5] | 417 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 418 | returnToKernel(); |
---|
[14a61b5] | 419 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[36982fc] | 420 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[75f3522] | 421 | } |
---|
| 422 | |
---|
[ea7d2b0] | 423 | void BlockInternal( __spinlock_t * lock ) { |
---|
[82ff5845] | 424 | disable_interrupts(); |
---|
[14a61b5] | 425 | with( *kernelTLS.this_processor ) { |
---|
[de6319f] | 426 | finish.action_code = Release; |
---|
| 427 | finish.lock = lock; |
---|
| 428 | } |
---|
[0b33412] | 429 | |
---|
[afd550c] | 430 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 431 | returnToKernel(); |
---|
[afd550c] | 432 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 433 | |
---|
[36982fc] | 434 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[db6f06a] | 435 | } |
---|
| 436 | |
---|
[82ff5845] | 437 | void BlockInternal( thread_desc * thrd ) { |
---|
| 438 | disable_interrupts(); |
---|
[14a61b5] | 439 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 440 | finish.action_code = Schedule; |
---|
| 441 | finish.thrd = thrd; |
---|
| 442 | } |
---|
[0b33412] | 443 | |
---|
[14a61b5] | 444 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 445 | returnToKernel(); |
---|
[14a61b5] | 446 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 447 | |
---|
[36982fc] | 448 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[db6f06a] | 449 | } |
---|
| 450 | |
---|
[ea7d2b0] | 451 | void BlockInternal( __spinlock_t * lock, thread_desc * thrd ) { |
---|
[97e3296] | 452 | assert(thrd); |
---|
[82ff5845] | 453 | disable_interrupts(); |
---|
[14a61b5] | 454 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 455 | finish.action_code = Release_Schedule; |
---|
| 456 | finish.lock = lock; |
---|
| 457 | finish.thrd = thrd; |
---|
| 458 | } |
---|
[0b33412] | 459 | |
---|
[14a61b5] | 460 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 461 | returnToKernel(); |
---|
[14a61b5] | 462 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 463 | |
---|
[36982fc] | 464 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[eb2e723] | 465 | } |
---|
| 466 | |
---|
[ea7d2b0] | 467 | void BlockInternal(__spinlock_t * locks [], unsigned short count) { |
---|
[82ff5845] | 468 | disable_interrupts(); |
---|
[14a61b5] | 469 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 470 | finish.action_code = Release_Multi; |
---|
| 471 | finish.locks = locks; |
---|
| 472 | finish.lock_count = count; |
---|
| 473 | } |
---|
[0b33412] | 474 | |
---|
[14a61b5] | 475 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 476 | returnToKernel(); |
---|
[14a61b5] | 477 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 478 | |
---|
[36982fc] | 479 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[0c78741] | 480 | } |
---|
| 481 | |
---|
[ea7d2b0] | 482 | void BlockInternal(__spinlock_t * locks [], unsigned short lock_count, thread_desc * thrds [], unsigned short thrd_count) { |
---|
[82ff5845] | 483 | disable_interrupts(); |
---|
[14a61b5] | 484 | with( *kernelTLS.this_processor ) { |
---|
[de6319f] | 485 | finish.action_code = Release_Multi_Schedule; |
---|
| 486 | finish.locks = locks; |
---|
| 487 | finish.lock_count = lock_count; |
---|
| 488 | finish.thrds = thrds; |
---|
| 489 | finish.thrd_count = thrd_count; |
---|
| 490 | } |
---|
[0b33412] | 491 | |
---|
[14a61b5] | 492 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[82c948c] | 493 | returnToKernel(); |
---|
[14a61b5] | 494 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[0b33412] | 495 | |
---|
[36982fc] | 496 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[0c78741] | 497 | } |
---|
| 498 | |
---|
[14a61b5] | 499 | // KERNEL ONLY |
---|
[ea7d2b0] | 500 | void LeaveThread(__spinlock_t * lock, thread_desc * thrd) { |
---|
[14a61b5] | 501 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
| 502 | with( * kernelTLS.this_processor ) { |
---|
[de6319f] | 503 | finish.action_code = thrd ? Release_Schedule : Release; |
---|
| 504 | finish.lock = lock; |
---|
| 505 | finish.thrd = thrd; |
---|
| 506 | } |
---|
[f2b12406] | 507 | |
---|
[82c948c] | 508 | returnToKernel(); |
---|
[f2b12406] | 509 | } |
---|
| 510 | |
---|
[fa21ac9] | 511 | //============================================================================================= |
---|
| 512 | // Kernel Setup logic |
---|
| 513 | //============================================================================================= |
---|
[eb2e723] | 514 | //----------------------------------------------------------------------------- |
---|
| 515 | // Kernel boot procedures |
---|
| 516 | void kernel_startup(void) { |
---|
[14a61b5] | 517 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[36982fc] | 518 | __cfaabi_dbg_print_safe("Kernel : Starting\n"); |
---|
[eb2e723] | 519 | |
---|
[de94a60] | 520 | global_threads. list{ __get }; |
---|
| 521 | global_threads. lock{}; |
---|
| 522 | global_clusters.list{ __get }; |
---|
| 523 | global_clusters.lock{}; |
---|
| 524 | |
---|
[de6319f] | 525 | // Initialize the main cluster |
---|
| 526 | mainCluster = (cluster *)&storage_mainCluster; |
---|
| 527 | (*mainCluster){"Main Cluster"}; |
---|
| 528 | |
---|
| 529 | __cfaabi_dbg_print_safe("Kernel : Main cluster ready\n"); |
---|
| 530 | |
---|
[eb2e723] | 531 | // Start by initializing the main thread |
---|
[1c273d0] | 532 | // SKULLDUGGERY: the mainThread steals the process main thread |
---|
[969b3fe] | 533 | // which will then be scheduled by the mainProcessor normally |
---|
| 534 | mainThread = (thread_desc *)&storage_mainThread; |
---|
[8fcbb4c] | 535 | current_stack_info_t info; |
---|
[83a071f9] | 536 | (*mainThread){ &info }; |
---|
[eb2e723] | 537 | |
---|
[36982fc] | 538 | __cfaabi_dbg_print_safe("Kernel : Main thread ready\n"); |
---|
[fa21ac9] | 539 | |
---|
[bd98b58] | 540 | |
---|
[de6319f] | 541 | |
---|
| 542 | // Construct the processor context of the main processor |
---|
| 543 | void ?{}(processorCtx_t & this, processor * proc) { |
---|
| 544 | (this.__cor){ "Processor" }; |
---|
| 545 | this.__cor.starter = NULL; |
---|
| 546 | this.proc = proc; |
---|
| 547 | } |
---|
| 548 | |
---|
| 549 | void ?{}(processor & this) with( this ) { |
---|
| 550 | name = "Main Processor"; |
---|
| 551 | cltr = mainCluster; |
---|
| 552 | terminated{ 0 }; |
---|
| 553 | do_terminate = false; |
---|
| 554 | preemption_alarm = NULL; |
---|
| 555 | pending_preemption = false; |
---|
| 556 | kernel_thread = pthread_self(); |
---|
| 557 | |
---|
| 558 | runner{ &this }; |
---|
| 559 | __cfaabi_dbg_print_safe("Kernel : constructed main processor context %p\n", &runner); |
---|
| 560 | } |
---|
[fa21ac9] | 561 | |
---|
[969b3fe] | 562 | // Initialize the main processor and the main processor ctx |
---|
[eb2e723] | 563 | // (the coroutine that contains the processing control flow) |
---|
[969b3fe] | 564 | mainProcessor = (processor *)&storage_mainProcessor; |
---|
[de6319f] | 565 | (*mainProcessor){}; |
---|
[eb2e723] | 566 | |
---|
[dcb42b8] | 567 | //initialize the global state variables |
---|
[14a61b5] | 568 | kernelTLS.this_processor = mainProcessor; |
---|
| 569 | kernelTLS.this_thread = mainThread; |
---|
| 570 | kernelTLS.this_coroutine = &mainThread->self_cor; |
---|
[eb2e723] | 571 | |
---|
[82ff5845] | 572 | // Enable preemption |
---|
| 573 | kernel_start_preemption(); |
---|
| 574 | |
---|
[969b3fe] | 575 | // Add the main thread to the ready queue |
---|
| 576 | // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread |
---|
| 577 | ScheduleThread(mainThread); |
---|
| 578 | |
---|
| 579 | // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX |
---|
[dcb42b8] | 580 | // context. Hence, the main thread does not begin through CtxInvokeThread, like all other threads. The trick here is that |
---|
[1c273d0] | 581 | // mainThread is on the ready queue when this call is made. |
---|
[14a61b5] | 582 | kernel_first_resume( kernelTLS.this_processor ); |
---|
[eb2e723] | 583 | |
---|
[dcb42b8] | 584 | |
---|
| 585 | |
---|
| 586 | // THE SYSTEM IS NOW COMPLETELY RUNNING |
---|
[36982fc] | 587 | __cfaabi_dbg_print_safe("Kernel : Started\n--------------------------------------------------\n\n"); |
---|
[82ff5845] | 588 | |
---|
[14a61b5] | 589 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[36982fc] | 590 | enable_interrupts( __cfaabi_dbg_ctx ); |
---|
[afd550c] | 591 | verify( TL_GET( preemption_state.enabled ) ); |
---|
[eb2e723] | 592 | } |
---|
| 593 | |
---|
[dcb42b8] | 594 | void kernel_shutdown(void) { |
---|
[36982fc] | 595 | __cfaabi_dbg_print_safe("\n--------------------------------------------------\nKernel : Shutting down\n"); |
---|
[eb2e723] | 596 | |
---|
[afd550c] | 597 | verify( TL_GET( preemption_state.enabled ) ); |
---|
[4e6fb8e] | 598 | disable_interrupts(); |
---|
[14a61b5] | 599 | verify( ! kernelTLS.preemption_state.enabled ); |
---|
[4e6fb8e] | 600 | |
---|
[969b3fe] | 601 | // SKULLDUGGERY: Notify the mainProcessor it needs to terminates. |
---|
[dcb42b8] | 602 | // When its coroutine terminates, it return control to the mainThread |
---|
| 603 | // which is currently here |
---|
[969b3fe] | 604 | mainProcessor->do_terminate = true; |
---|
[82c948c] | 605 | returnToKernel(); |
---|
[eb2e723] | 606 | |
---|
[dcb42b8] | 607 | // THE SYSTEM IS NOW COMPLETELY STOPPED |
---|
[eb2e723] | 608 | |
---|
[82ff5845] | 609 | // Disable preemption |
---|
| 610 | kernel_stop_preemption(); |
---|
| 611 | |
---|
[969b3fe] | 612 | // Destroy the main processor and its context in reverse order of construction |
---|
[dcb42b8] | 613 | // These were manually constructed so we need manually destroy them |
---|
[094476d] | 614 | ^(mainProcessor->runner){}; |
---|
[969b3fe] | 615 | ^(mainProcessor){}; |
---|
[eb2e723] | 616 | |
---|
[dcb42b8] | 617 | // Final step, destroy the main thread since it is no longer needed |
---|
| 618 | // Since we provided a stack to this taxk it will not destroy anything |
---|
[eb2e723] | 619 | ^(mainThread){}; |
---|
| 620 | |
---|
[36982fc] | 621 | __cfaabi_dbg_print_safe("Kernel : Shutdown complete\n"); |
---|
[9d944b2] | 622 | } |
---|
| 623 | |
---|
[14a61b5] | 624 | //============================================================================================= |
---|
| 625 | // Kernel Quiescing |
---|
| 626 | //============================================================================================= |
---|
| 627 | |
---|
| 628 | // void halt(processor * this) with( this ) { |
---|
| 629 | // pthread_mutex_lock( &idle.lock ); |
---|
| 630 | |
---|
| 631 | |
---|
| 632 | |
---|
| 633 | // // SKULLDUGGERY: Even if spurious wake-up is a thing |
---|
| 634 | // // spuriously waking up a kernel thread is not a big deal |
---|
| 635 | // // if it is very rare. |
---|
| 636 | // pthread_cond_wait( &idle.cond, &idle.lock); |
---|
| 637 | // pthread_mutex_unlock( &idle.lock ); |
---|
| 638 | // } |
---|
| 639 | |
---|
| 640 | // void wake(processor * this) with( this ) { |
---|
| 641 | // pthread_mutex_lock (&idle.lock); |
---|
| 642 | // pthread_cond_signal (&idle.cond); |
---|
| 643 | // pthread_mutex_unlock(&idle.lock); |
---|
| 644 | // } |
---|
| 645 | |
---|
[dbe9b08] | 646 | //============================================================================================= |
---|
| 647 | // Unexpected Terminating logic |
---|
| 648 | //============================================================================================= |
---|
| 649 | |
---|
| 650 | |
---|
[ea7d2b0] | 651 | static __spinlock_t kernel_abort_lock; |
---|
[9d944b2] | 652 | static bool kernel_abort_called = false; |
---|
| 653 | |
---|
[afd550c] | 654 | void * kernel_abort(void) __attribute__ ((__nothrow__)) { |
---|
[9d944b2] | 655 | // abort cannot be recursively entered by the same or different processors because all signal handlers return when |
---|
| 656 | // the globalAbort flag is true. |
---|
[36982fc] | 657 | lock( kernel_abort_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 658 | |
---|
| 659 | // first task to abort ? |
---|
[de94a60] | 660 | if ( kernel_abort_called ) { // not first task to abort ? |
---|
[ea7d2b0] | 661 | unlock( kernel_abort_lock ); |
---|
[1c273d0] | 662 | |
---|
[9d944b2] | 663 | sigset_t mask; |
---|
| 664 | sigemptyset( &mask ); |
---|
[de94a60] | 665 | sigaddset( &mask, SIGALRM ); // block SIGALRM signals |
---|
| 666 | sigsuspend( &mask ); // block the processor to prevent further damage during abort |
---|
| 667 | _exit( EXIT_FAILURE ); // if processor unblocks before it is killed, terminate it |
---|
| 668 | } |
---|
| 669 | else { |
---|
| 670 | kernel_abort_called = true; |
---|
| 671 | unlock( kernel_abort_lock ); |
---|
[9d944b2] | 672 | } |
---|
| 673 | |
---|
[14a61b5] | 674 | return kernelTLS.this_thread; |
---|
[9d944b2] | 675 | } |
---|
| 676 | |
---|
| 677 | void kernel_abort_msg( void * kernel_data, char * abort_text, int abort_text_size ) { |
---|
| 678 | thread_desc * thrd = kernel_data; |
---|
| 679 | |
---|
[de94a60] | 680 | if(thrd) { |
---|
| 681 | int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd ); |
---|
[36982fc] | 682 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
[de94a60] | 683 | |
---|
| 684 | if ( get_coroutine(thrd) != kernelTLS.this_coroutine ) { |
---|
| 685 | len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", kernelTLS.this_coroutine->name, kernelTLS.this_coroutine ); |
---|
| 686 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
| 687 | } |
---|
| 688 | else { |
---|
| 689 | __cfaabi_dbg_bits_write( ".\n", 2 ); |
---|
| 690 | } |
---|
[1c273d0] | 691 | } |
---|
[9d944b2] | 692 | else { |
---|
[de94a60] | 693 | int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" ); |
---|
[639991a] | 694 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
[9d944b2] | 695 | } |
---|
| 696 | } |
---|
| 697 | |
---|
[2b8bc41] | 698 | int kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) { |
---|
[14a61b5] | 699 | return get_coroutine(kernelTLS.this_thread) == get_coroutine(mainThread) ? 4 : 2; |
---|
[2b8bc41] | 700 | } |
---|
| 701 | |
---|
[de94a60] | 702 | static __spinlock_t kernel_debug_lock; |
---|
| 703 | |
---|
[9d944b2] | 704 | extern "C" { |
---|
[36982fc] | 705 | void __cfaabi_dbg_bits_acquire() { |
---|
| 706 | lock( kernel_debug_lock __cfaabi_dbg_ctx2 ); |
---|
[9d944b2] | 707 | } |
---|
| 708 | |
---|
[36982fc] | 709 | void __cfaabi_dbg_bits_release() { |
---|
[ea7d2b0] | 710 | unlock( kernel_debug_lock ); |
---|
[9d944b2] | 711 | } |
---|
[8118303] | 712 | } |
---|
| 713 | |
---|
[fa21ac9] | 714 | //============================================================================================= |
---|
| 715 | // Kernel Utilities |
---|
| 716 | //============================================================================================= |
---|
[bd98b58] | 717 | //----------------------------------------------------------------------------- |
---|
| 718 | // Locks |
---|
[242a902] | 719 | void ?{}( semaphore & this, int count = 1 ) { |
---|
| 720 | (this.lock){}; |
---|
| 721 | this.count = count; |
---|
| 722 | (this.waiting){}; |
---|
[db6f06a] | 723 | } |
---|
[242a902] | 724 | void ^?{}(semaphore & this) {} |
---|
[db6f06a] | 725 | |
---|
[65deb18] | 726 | void P(semaphore & this) with( this ){ |
---|
| 727 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 728 | count -= 1; |
---|
| 729 | if ( count < 0 ) { |
---|
[bdeba0b] | 730 | // queue current task |
---|
[14a61b5] | 731 | append( waiting, kernelTLS.this_thread ); |
---|
[bdeba0b] | 732 | |
---|
| 733 | // atomically release spin lock and block |
---|
[65deb18] | 734 | BlockInternal( &lock ); |
---|
[8def349] | 735 | } |
---|
[4e6fb8e] | 736 | else { |
---|
[65deb18] | 737 | unlock( lock ); |
---|
[4e6fb8e] | 738 | } |
---|
[bd98b58] | 739 | } |
---|
| 740 | |
---|
[65deb18] | 741 | void V(semaphore & this) with( this ) { |
---|
[bdeba0b] | 742 | thread_desc * thrd = NULL; |
---|
[65deb18] | 743 | lock( lock __cfaabi_dbg_ctx2 ); |
---|
| 744 | count += 1; |
---|
| 745 | if ( count <= 0 ) { |
---|
[bdeba0b] | 746 | // remove task at head of waiting list |
---|
[65deb18] | 747 | thrd = pop_head( waiting ); |
---|
[bd98b58] | 748 | } |
---|
[bdeba0b] | 749 | |
---|
[65deb18] | 750 | unlock( lock ); |
---|
[bdeba0b] | 751 | |
---|
| 752 | // make new owner |
---|
| 753 | WakeThread( thrd ); |
---|
[bd98b58] | 754 | } |
---|
| 755 | |
---|
[f7d6bb0] | 756 | //----------------------------------------------------------------------------- |
---|
[de94a60] | 757 | // Global Queues |
---|
| 758 | void doregister( thread_desc & thrd ) { |
---|
[639991a] | 759 | lock ( global_threads.lock __cfaabi_dbg_ctx2); |
---|
| 760 | push_front( global_threads.list, thrd ); |
---|
| 761 | unlock ( global_threads.lock ); |
---|
[de94a60] | 762 | } |
---|
[f7d6bb0] | 763 | |
---|
[de94a60] | 764 | void unregister( thread_desc & thrd ) { |
---|
[639991a] | 765 | lock ( global_threads.lock __cfaabi_dbg_ctx2); |
---|
| 766 | remove( global_threads.list, thrd ); |
---|
| 767 | unlock( global_threads.lock ); |
---|
[de94a60] | 768 | } |
---|
[f7d6bb0] | 769 | |
---|
[de94a60] | 770 | void doregister( cluster & cltr ) { |
---|
[639991a] | 771 | lock ( global_clusters.lock __cfaabi_dbg_ctx2); |
---|
| 772 | push_front( global_clusters.list, cltr ); |
---|
| 773 | unlock ( global_clusters.lock ); |
---|
[de94a60] | 774 | } |
---|
[f7d6bb0] | 775 | |
---|
[de94a60] | 776 | void unregister( cluster & cltr ) { |
---|
[639991a] | 777 | lock ( global_clusters.lock __cfaabi_dbg_ctx2); |
---|
| 778 | remove( global_clusters.list, cltr ); |
---|
| 779 | unlock( global_clusters.lock ); |
---|
[de94a60] | 780 | } |
---|
[f7d6bb0] | 781 | |
---|
[9181f1d] | 782 | |
---|
[de94a60] | 783 | void doregister( cluster * cltr, processor * proc ) { |
---|
[639991a] | 784 | lock (cltr->proc_list_lock __cfaabi_dbg_ctx2); |
---|
| 785 | push_front(cltr->procs, *proc); |
---|
| 786 | unlock (cltr->proc_list_lock); |
---|
[de94a60] | 787 | } |
---|
| 788 | |
---|
| 789 | void unregister( cluster * cltr, processor * proc ) { |
---|
[639991a] | 790 | lock (cltr->proc_list_lock __cfaabi_dbg_ctx2); |
---|
| 791 | remove(cltr->procs, *proc ); |
---|
| 792 | unlock(cltr->proc_list_lock); |
---|
[de94a60] | 793 | } |
---|
| 794 | |
---|
| 795 | //----------------------------------------------------------------------------- |
---|
| 796 | // Debug |
---|
| 797 | __cfaabi_dbg_debug_do( |
---|
[9181f1d] | 798 | void __cfaabi_dbg_record(__spinlock_t & this, const char * prev_name) { |
---|
| 799 | this.prev_name = prev_name; |
---|
[14a61b5] | 800 | this.prev_thrd = kernelTLS.this_thread; |
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[9181f1d] | 801 | } |
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[f7d6bb0] | 802 | ) |
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[8118303] | 803 | // Local Variables: // |
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| 804 | // mode: c // |
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| 805 | // tab-width: 4 // |
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| 806 | // End: // |
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