diff options
Diffstat (limited to 'i386/pc/rv86/rv86_reflect_irq.S')
| -rw-r--r-- | i386/pc/rv86/rv86_reflect_irq.S | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/i386/pc/rv86/rv86_reflect_irq.S b/i386/pc/rv86/rv86_reflect_irq.S new file mode 100644 index 0000000..5d68fae --- /dev/null +++ b/i386/pc/rv86/rv86_reflect_irq.S @@ -0,0 +1,113 @@ +/* + * 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 + |