535b692091
doscmd heavily depends on struct sigcontext which luckily is mostly passed
between functions as usion regcontext_t. By redefining union regcontext_t in
terms of mcontext_t almost all bases are covered.
It also seems to me that doscmd was in a transitional state. The redundant
definitions made it difficult to get a clear overview and could easily cause
oversight. To make sure my changes were ok, I went as far as to complete the
transition. It was not exactly necessary, but I expect to have to come back
here some more ("whistle" if I'm wrong :-).
140 lines
2.8 KiB
C
140 lines
2.8 KiB
C
/*
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** No copyright?!
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**
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** $FreeBSD$
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*/
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#include "doscmd.h"
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/*
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** Cause a software interrupt to happen immediately after we
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** return to vm86 mode
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*/
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void
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softint(int intnum)
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{
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regcontext_t *REGS = saved_regcontext;
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u_long vec = ivec[intnum];
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/*
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** if we're dead, or there's no vector or the saved registers are
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** invalid
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*/
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if (dead || !saved_valid || vec == 0)
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return;
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/*
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** if the vector points into the BIOS, or the handler at the other
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** end is just an IRET, don't bother.
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*/
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if ((vec >> 16) == 0xf000 || *(u_char *)VECPTR(vec) == 0xcf)
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return;
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#if 0
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/*
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* software interrupts are always taken
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*/
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if ((R_EFLAGS & PSL_VIF) == 0) {
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delay_interrupt(intnum, softint);
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return;
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}
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#endif
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debug(D_TRAPS|intnum, "Int%x [%04x:%04x]\n",
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intnum, vec >> 16, vec & 0xffff);
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PUSH((R_FLAGS & ~PSL_I) | (R_EFLAGS & PSL_VIF ? PSL_I : 0), REGS);
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PUSH(R_CS, REGS);
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PUSH(R_IP, REGS);
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#if 1
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R_EFLAGS &= ~PSL_VIF; /* XXX disable interrupts? */
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#else
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R_EFLAGS |= PSL_VIF;
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#endif
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PUTVEC(R_CS, R_IP, vec);
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}
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/*
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** Cause a hardware interrupt to happen immediately after
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** we return to vm86 mode
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*/
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void
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hardint(int intnum)
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{
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regcontext_t *REGS = saved_regcontext;
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u_long vec = ivec[intnum];
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/*
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* XXXXX
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* We should simulate the IRQ mask in the PIC.
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*/
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/*
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** if we're dead, or there's no vector, or the saved registers
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** are invalid
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*/
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if (dead || !saved_valid || vec == 0)
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return;
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/*
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** if the vector points into the BIOS, or the handler at the
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** other end is just an IRET, don't bother
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*/
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if ((vec >> 16) == 0xf000 || *(u_char *)VECPTR(vec) == 0xcf)
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return;
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if ((R_EFLAGS & PSL_VIF) == 0) {
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delay_interrupt(intnum, hardint);
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return;
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}
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debug(D_TRAPS|intnum, "Int%x [%04x:%04x]\n",
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intnum, vec >> 16, vec & 0xffff);
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PUSH((R_FLAGS & ~PSL_I) | (R_EFLAGS & PSL_VIF ? PSL_I : 0), REGS);
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PUSH(R_CS, REGS);
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PUSH(R_IP, REGS);
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#if 1
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R_EFLAGS &= ~PSL_VIF; /* XXX disable interrupts */
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#else
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R_EFLAGS |= PSL_VIF;
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#endif
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PUTVEC(R_CS, R_IP, vec);
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}
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typedef void (*foo_t)(int);
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void
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resume_interrupt(void)
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{
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int i;
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regcontext_t *REGS = saved_regcontext;
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n_pending--;
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if (n_pending == 0)
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R_EFLAGS &= ~PSL_VIP;
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for (i = 0; i < 256; i++) {
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if (pending[i]) {
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((foo_t)(pending[i]))(i);
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pending[i] = 0;
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break;
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}
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}
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}
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void
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delay_interrupt(int intnum, void (*func)(int))
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{
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regcontext_t *REGS = saved_regcontext;
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#if 0
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printf("DELAY [%x/%d]\n", intnum, n_pending);
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#endif
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if (pending[intnum] == 0) {
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pending[intnum] = (u_long)func;
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n_pending++;
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}
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R_EFLAGS |= PSL_VIP;
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}
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