89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
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/*
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* Copyright (c) 2008 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <sys/types.h>
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#include <string.h>
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#include <stdlib.h>
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#include <debug.h>
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#include <kernel/thread.h>
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#include <arch/arm.h>
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struct context_switch_frame {
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vaddr_t r4;
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vaddr_t r5;
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vaddr_t r6;
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vaddr_t r7;
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vaddr_t r8;
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vaddr_t r9;
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vaddr_t r10;
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vaddr_t r11;
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vaddr_t lr;
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vaddr_t usp;
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vaddr_t ulr;
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};
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extern void arm_context_switch(addr_t *old_sp, addr_t new_sp);
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static void initial_thread_func(void) __NO_RETURN;
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static void initial_thread_func(void)
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{
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int ret;
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// dprintf("initial_thread_func: thread %p calling %p with arg %p\n", current_thread, current_thread->entry, current_thread->arg);
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// dump_thread(current_thread);
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/* exit the implicit critical section we're within */
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exit_critical_section();
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ret = current_thread->entry(current_thread->arg);
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// dprintf("initial_thread_func: thread %p exiting with %d\n", current_thread, ret);
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thread_exit(ret);
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}
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void arch_thread_initialize(thread_t *t)
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{
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// create a default stack frame on the stack
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vaddr_t stack_top = (vaddr_t)t->stack + t->stack_size;
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// make sure the top of the stack is 8 byte aligned for EABI compliance
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stack_top = ROUNDDOWN(stack_top, 8);
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struct context_switch_frame *frame = (struct context_switch_frame *)(stack_top);
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frame--;
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// fill it in
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memset(frame, 0, sizeof(*frame));
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frame->lr = (vaddr_t)&initial_thread_func;
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// set the stack pointer
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t->arch.sp = (vaddr_t)frame;
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}
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void arch_context_switch(thread_t *oldthread, thread_t *newthread)
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{
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// dprintf("arch_context_switch: old %p (%s), new %p (%s)\n", oldthread, oldthread->name, newthread, newthread->name);
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arm_context_switch(&oldthread->arch.sp, newthread->arch.sp);
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}
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