nes-proj/cpu/x86/mtarch.c

120 lines
2.6 KiB
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#include <stdio.h>
#include "sys/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
mtarch_init(void)
{
}
/*--------------------------------------------------------------------------*/
void
mtarch_start(struct mtarch_thread *t,
void (*function)(void *), void *data)
{
struct frame *f = (struct frame *)&t->stack[MTARCH_STACKSIZE - sizeof(struct frame)/4];
int i;
for(i = 0; i < 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 spsave, sptmp;
static struct mtarch_thread *running_thread;
static void
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, spsave");
sptmp = running_thread->sp;
running_thread->sp = spsave;
asm("movl 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
mtarch_exec(struct mtarch_thread *t)
{
running_thread = t;
sw();
running_thread = NULL;
}
/*--------------------------------------------------------------------------*/
void
mtarch_remove(void)
{
}
/*--------------------------------------------------------------------------*/
void
mtarch_yield(void)
{
sw();
}
/*--------------------------------------------------------------------------*/
void
mtarch_pstop(void)
{
}
/*--------------------------------------------------------------------------*/
void
mtarch_pstart(void)
{
}
/*--------------------------------------------------------------------------*/
int
mtarch_stack_usage(struct mt_thread *t)
{
int i;
for(i = 0; i < MTARCH_STACKSIZE; ++i) {
if(t->thread.stack[i] != i) {
return MTARCH_STACKSIZE - i;
}
}
}
/*--------------------------------------------------------------------------*/