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/* $OpenBSD: gidt.S,v 1.1 1997/04/05 18:56:27 mickey Exp $ */
/*
* Copyright (c) 1997 Michael Shalayeff
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Michael Shalayeff.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <machine/asm.h>
#include <machine/psl.h>
#define _LOCORE
#include <machine/segments.h>
#include <machine/trap.h>
#include <debug_md.h>
#undef _LOCORE
.data
.globl _Gdtr
.globl _codeseg
.align 3
gdt:
/* 0x00 : null */
.space 8
/* 0x08 : flat code */
.word 0xFFFF # lolimit
.word 0 # lobase
.byte 0 # midbase
.byte SDT_MEMERA | 0 | 0x80 # RWXA, dpl = 0, present
.byte 0xf | 0 | 0x40 | 0x80 # hilimit, xx, 32bit, 4k granularity
.byte 0 # hibase
/* 0x10 : flat data */
.word 0xFFFF # lolimit
.word 0 # lobase
.byte 0 # midbase
.byte SDT_MEMRWA | 0 | 0x80 # RWA, dpl = 0, present
.byte 0xf | 0 | 0x40 | 0x80 # hilimit, xx, 32bit, 4k granularity
.byte 0 # hibase
/* 0x18 : 16 bit code */
.word 0xFFFF # lolimit
.word 0 # lobase
.byte 0 # midbase
.byte SDT_MEMERA | 0 | 0x80 # RWXA, dpl = 0, present
.byte 0xf | 0 | 0 | 0 # hilimit, xx, 16bit, byte granularity
.byte 0 # hibase
_Gdtr: .word . - gdt - 1
.long gdt
.word 0
_codeseg: .long 0
.globl _Idtr_real
.align 3
_Idtr_real:
.word 1023
.long 0
.globl _Idtr_prot
.align 3
idt: /*
* We beleive that all the boot code fits into
* 64k, so no need for high 16 bit of procedure address (;
*
*/
#define IPROC(n) X/**/n
#define IDTENTRY(proc) \
.word IPROC(proc) /* lo offset handler */ ; \
.word 0x8 /* handler %cs */ ; \
.byte 0 /* reserved */ ; \
.byte 0x80 | SDT_SYS386TGT /* present, dpl=0, 32bit trap gate */ ; \
.word 0 /* hi offset handler */
IDTENTRY(de) /* #DE divide by zero */
IDTENTRY(db) /* #DB debug */
IDTENTRY(nmi) /* NMI */
IDTENTRY(bp) /* #BP breakpoint */
IDTENTRY(of) /* #OF overflow */
IDTENTRY(br) /* #BR BOUND range exceeded */
IDTENTRY(ud) /* #UD invalid opcode */
IDTENTRY(nm) /* #NM device not available */
IDTENTRY(df) /* #DF double fault */
IDTENTRY(fo) /* #FO coprocessor segment overrun */
IDTENTRY(ts) /* #TS innvalid TSS */
IDTENTRY(np) /* #NP segmant not present */
IDTENTRY(ss) /* #SS stack fault */
IDTENTRY(gp) /* #GP general protection */
IDTENTRY(pf) /* #PF page fault */
IDTENTRY(xx) /* Intel reserved */
IDTENTRY(mf) /* #MF floating point error */
IDTENTRY(ac) /* #AC alignment check */
IDTENTRY(mc) /* #MC machine check */
/* Intel reserved (19-31) */
IDTENTRY(xx); IDTENTRY(xx); IDTENTRY(xx); IDTENTRY(xx)
IDTENTRY(xx); IDTENTRY(xx); IDTENTRY(xx); IDTENTRY(xx)
IDTENTRY(xx); IDTENTRY(xx); IDTENTRY(xx); IDTENTRY(xx)
IDTENTRY(xx)
/* Maskable interrupts(32-255) */
_Idtr_prot:
.word . - idt
.long idt
.text
.globl alltraps
#define IENTRY(name,type) \
IPROC(name): \
pushl $type ; \
jmp alltraps
#define IENTRY_ERR(name,err,type) \
IPROC(name): \
pushl $err ; \
pushl $type ; \
jmp alltraps
IPROC(xx):
pushl $1
pushl $256
jmp alltraps
IENTRY_ERR(de,0,T_DIVIDE)
IENTRY_ERR(db,0,T_TRCTRAP)
IENTRY_ERR(nmi,0,T_NMI)
IENTRY_ERR(bp,0,T_BPTFLT)
IENTRY_ERR(of,0,T_OFLOW)
IENTRY_ERR(br,0,T_BOUND)
IENTRY_ERR(ud,0,T_PRIVINFLT)
IENTRY_ERR(nm,0,T_DNA)
IENTRY(df,T_DOUBLEFLT)
IENTRY_ERR(fo,0,T_FPOPFLT)
IENTRY(ts,T_TSSFLT)
IENTRY(np,T_SEGNPFLT)
IENTRY(ss,T_STKFLT)
IENTRY(gp,T_PROTFLT)
IENTRY(pf,T_PAGEFLT)
IENTRY_ERR(mf,0,T_ARITHTRAP)
IENTRY(ac,T_ALIGNFLT)
IENTRY(mc,T_MACHK)
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