305573cb29
a group of dos emulator developers. Submitted by: Jonathan Lemon <jlemon@americantv.com> Obtained from: BSDI
140 lines
2.8 KiB
C
140 lines
2.8 KiB
C
/*
|
|
** No copyright?!
|
|
**
|
|
** $Id: int.c,v 1.4 1997/03/18 02:36:56 msmith Exp $
|
|
*/
|
|
#include "doscmd.h"
|
|
|
|
/*
|
|
** Cause a software interrupt to happen immediately after we
|
|
** return to vm86 mode
|
|
*/
|
|
void
|
|
softint(int intnum)
|
|
{
|
|
regcontext_t *REGS = saved_regcontext;
|
|
u_long vec = ivec[intnum];
|
|
|
|
/*
|
|
** if we're dead, or there's no vector or the saved registers are
|
|
** invalid
|
|
*/
|
|
if (dead || !saved_valid || vec == 0)
|
|
return;
|
|
|
|
/*
|
|
** if the vector points into the BIOS, or the handler at the other
|
|
** end is just an IRET, don't bother.
|
|
*/
|
|
if ((vec >> 16) == 0xf000 || *(u_char *)VECPTR(vec) == 0xcf)
|
|
return;
|
|
|
|
#if 0
|
|
/*
|
|
* software interrupts are always taken
|
|
*/
|
|
if ((R_EFLAGS & PSL_VIF) == 0) {
|
|
delay_interrupt(intnum, softint);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
debug(D_TRAPS|intnum, "Int%x [%04x:%04x]\n",
|
|
intnum, vec >> 16, vec & 0xffff);
|
|
|
|
N_PUSH((R_FLAGS & ~PSL_I) | (R_EFLAGS & PSL_VIF ? PSL_I : 0), REGS);
|
|
N_PUSH(R_CS, REGS);
|
|
N_PUSH(R_IP, REGS);
|
|
#if 1
|
|
R_EFLAGS &= ~PSL_VIF; /* XXX disable interrupts? */
|
|
#else
|
|
R_EFLAGS |= PSL_VIF;
|
|
#endif
|
|
N_PUTVEC(R_CS, R_IP, vec);
|
|
}
|
|
|
|
/*
|
|
** Cause a hardware interrupt to happen immediately after
|
|
** we return to vm86 mode
|
|
*/
|
|
void
|
|
hardint(int intnum)
|
|
{
|
|
regcontext_t *REGS = saved_regcontext;
|
|
u_long vec = ivec[intnum];
|
|
|
|
/*
|
|
* XXXXX
|
|
* We should simulate the IRQ mask in the PIC.
|
|
*/
|
|
|
|
/*
|
|
** if we're dead, or there's no vector, or the saved registers
|
|
** are invalid
|
|
*/
|
|
if (dead || !saved_valid || vec == 0)
|
|
return;
|
|
|
|
/*
|
|
** if the vector points into the BIOS, or the handler at the
|
|
** other end is just an IRET, don't bother
|
|
*/
|
|
if ((vec >> 16) == 0xf000 || *(u_char *)VECPTR(vec) == 0xcf)
|
|
return;
|
|
|
|
if ((R_EFLAGS & PSL_VIF) == 0) {
|
|
delay_interrupt(intnum, hardint);
|
|
return;
|
|
}
|
|
|
|
debug(D_TRAPS|intnum, "Int%x [%04x:%04x]\n",
|
|
intnum, vec >> 16, vec & 0xffff);
|
|
|
|
N_PUSH((R_FLAGS & ~PSL_I) | (R_EFLAGS & PSL_VIF ? PSL_I : 0), REGS);
|
|
N_PUSH(R_CS, REGS);
|
|
N_PUSH(R_IP, REGS);
|
|
#if 1
|
|
R_EFLAGS &= ~PSL_VIF; /* XXX disable interrupts */
|
|
#else
|
|
R_EFLAGS |= PSL_VIF;
|
|
#endif
|
|
N_PUTVEC(R_CS, R_IP, vec);
|
|
}
|
|
|
|
typedef void (*foo_t)(int);
|
|
|
|
void
|
|
resume_interrupt(void)
|
|
{
|
|
int i;
|
|
regcontext_t *REGS = saved_regcontext;
|
|
|
|
n_pending--;
|
|
if (n_pending == 0)
|
|
R_EFLAGS &= ~PSL_VIP;
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
if (pending[i]) {
|
|
((foo_t)(pending[i]))(i);
|
|
pending[i] = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
delay_interrupt(int intnum, void (*func)(int))
|
|
{
|
|
regcontext_t *REGS = saved_regcontext;
|
|
|
|
#if 0
|
|
printf("DELAY [%x/%d]\n", intnum, n_pending);
|
|
#endif
|
|
if (pending[intnum] == 0) {
|
|
pending[intnum] = (u_long)func;
|
|
n_pending++;
|
|
}
|
|
R_EFLAGS |= PSL_VIP;
|
|
}
|