nes-proj/platform/cooja/sys/cooja_mtarch.c
fros4943 cb71b2fca6 added support for busy-waits in simulated contiki processes
(the entire process_run()-loop is inside a Contiki multi-thread)
2006-09-29 14:32:15 +00:00

125 lines
2.9 KiB
C

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