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/*
* Copyright (c) 1995 The University of Utah and
* the Computer Systems Laboratory at the University of Utah (CSL).
* All rights reserved.
*
* Permission to use, copy, modify and distribute this software is hereby
* granted provided that (1) source code retains these copyright, permission,
* and disclaimer notices, and (2) redistributions including binaries
* reproduce the notices in supporting documentation, and (3) all advertising
* materials mentioning features or use of this software display the following
* acknowledgement: ``This product includes software developed by the
* Computer Systems Laboratory at the University of Utah.''
*
* THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
* IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
* ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* CSL requests users of this software to return to csl-dist@cs.utah.edu any
* improvements that they make and grant CSL redistribution rights.
*
* Author: Bryan Ford, University of Utah CSL
*/
#include <mach/machine/asm.h>
#include <mach/machine/eflags.h>
#include "trap.h"
#include "trap_asm.h"
#include "pc_asm.h"
#include "i386_asm.h"
/*
* Define a set of interrupt handlers to reflect interrupts to v86 mode.
*/
.text
#define master_base 0x08
#define slave_base 0x70
#define irq(pic,picnum,irqnum) \
ENTRY(rv86_reflect_irq##irqnum) ;\
pushl $pic##_base+picnum ;\
pushl $0x80000000+irqnum /* (for debug) */ ;\
jmp allintrs
#include "irq_list.h"
allintrs:
pusha
pushl %ds
pushl %es
pushl %fs
pushl %gs
/* Load the normal kernel segment registers. */
movw %ss,%ax
movw %ax,%ds
movw %ax,%es
/* See if we came from v86 mode. */
testl $EFL_VM,TR_EFLAGS(%esp)
jnz int_from_v86
movl TR_ERR(%esp),%eax
pushl $dummy_rcd
pushl %eax
call EXT(rv86_real_int)
addl $2*4,%esp
popl %gs
popl %fs
popl %es
popl %ds
popa
addl $2*4,%esp
iret
int_from_v86:
/* Save the v86 stack pointer before handling the interrupt.
We need this in order to handle recursive reflected interrupts
possibly interspersed with protected-mode interrupts. */
movl EXT(rv86_usp),%esi
movl EXT(rv86_usp)+4,%edi
movl EXT(real_tss)+TSS_ESP0,%ebx
movl TR_ESP(%esp),%eax
subw $6,%ax /* allocate a real-mode interrupt stack frame. */
movl %eax,EXT(rv86_usp)
movl TR_SS(%esp),%eax
movw %ax,EXT(rv86_usp)+4
movl TR_ERR(%esp),%eax
pushl $dummy_rcd
pushl %eax
call EXT(rv86_real_int)
addl $2*4,%esp
movl %esi,EXT(rv86_usp)
movl %edi,EXT(rv86_usp)+4
movl %ebx,EXT(real_tss)+TSS_ESP0
addl $4*4,%esp
popa
addl $2*4,%esp
iret
/* Dummy real_call_data structure (always all zero)
to use when reflecting hardware interrupts. */
.comm dummy_rcd,RCD_SIZE
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