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125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
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* This file is ripped from x86/mtarch.c of the Contiki Multi-threading library.
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* Fredrik Osterlind <fros@sics.se>
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*/
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#include <stdio.h>
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#include "sys/cooja_mt.h"
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struct frame {
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unsigned long flags;
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unsigned long ebp;
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unsigned long edi;
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unsigned long esi;
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unsigned long edx;
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unsigned long ecx;
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unsigned long ebx;
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unsigned long eax;
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unsigned long retaddr;
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unsigned long retaddr2;
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unsigned long data;
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};
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_init(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_start(struct cooja_mtarch_thread *t,
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void (*function)(void *), void *data)
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{
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struct frame *f = (struct frame *)&t->stack[COOJA_MTARCH_STACKSIZE - sizeof(struct frame)/4];
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int i;
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for(i = 0; i < COOJA_MTARCH_STACKSIZE; ++i) {
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t->stack[i] = i;
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}
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memset(f, 0, sizeof(struct frame));
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f->retaddr = (unsigned long)function;
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f->data = (unsigned long)data;
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t->sp = (unsigned long)&f->flags;
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f->ebp = (unsigned long)&f->eax;
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}
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/*--------------------------------------------------------------------------*/
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static unsigned long cooja_spsave, cooja_sptmp;
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static struct cooja_mtarch_thread *cooja_running_thread;
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static void
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cooja_sw(void)
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{
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asm("pushl %eax");
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asm("pushl %ebx");
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asm("pushl %ecx");
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asm("pushl %edx");
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asm("pushl %esi");
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asm("pushl %edi");
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asm("pushl %ebp");
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// asm("pushl %ebp"); /* XXX: should push FPU flags here. */
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asm("movl %esp, cooja_spsave");
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cooja_sptmp = cooja_running_thread->sp;
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cooja_running_thread->sp = cooja_spsave;
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asm("movl cooja_sptmp, %esp");
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// asm("popl %ebp"); /* XXX: should pop FPU flags here. */
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asm("popl %ebp");
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asm("popl %edi");
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asm("popl %esi");
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asm("popl %edx");
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asm("popl %ecx");
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asm("popl %ebx");
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asm("popl %eax");
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_exec(struct cooja_mtarch_thread *t)
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{
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cooja_running_thread = t;
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cooja_sw();
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cooja_running_thread = NULL;
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_remove(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_yield(void)
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{
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cooja_sw();
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_pstop(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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cooja_mtarch_pstart(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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int
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cooja_mtarch_stack_usage(struct cooja_mt_thread *t)
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{
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int i;
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for(i = 0; i < COOJA_MTARCH_STACKSIZE; ++i) {
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if(t->thread.stack[i] != i) {
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return COOJA_MTARCH_STACKSIZE - i;
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}
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}
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return -1;
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}
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/*--------------------------------------------------------------------------*/
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