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