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Bochs/bochs/cpu/segment_ctrl_pro.cc

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/////////////////////////////////////////////////////////////////////////
// $Id: segment_ctrl_pro.cc,v 1.12 2002-09-15 02:23:12 kevinlawton Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
//
// MandrakeSoft S.A.
// 43, rue d'Aboukir
// 75002 Paris - France
// http://www.linux-mandrake.com/
// http://www.mandrakesoft.com/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#define NEED_CPU_REG_SHORTCUTS 1
#include "bochs.h"
#define LOG_THIS BX_CPU_THIS_PTR
void
BX_CPU_C::load_seg_reg(bx_segment_reg_t *seg, Bit16u new_value)
{
#if BX_CPU_LEVEL >= 3
if (v8086_mode()) {
/* ??? don't need to set all these fields */
seg->selector.value = new_value;
seg->selector.rpl = 3;
seg->cache.valid = 1;
seg->cache.p = 1;
seg->cache.dpl = 3;
seg->cache.segment = 1; /* regular segment */
if (seg == &BX_CPU_THIS_PTR sregs[BX_SREG_CS])
seg->cache.u.segment.executable = 1; /* code segment */
else
seg->cache.u.segment.executable = 0; /* data segment */
seg->cache.u.segment.c_ed = 0; /* expand up */
seg->cache.u.segment.r_w = 1; /* writeable */
seg->cache.u.segment.a = 1; /* accessed */
seg->cache.u.segment.base = new_value << 4;
seg->cache.u.segment.limit = 0xffff;
seg->cache.u.segment.limit_scaled = 0xffff;
seg->cache.u.segment.g = 0; /* byte granular */
seg->cache.u.segment.d_b = 0; /* default 16bit size */
#if BX_SUPPORT_X86_64
seg->cache.u.segment.l = 0; /* default 16bit size */
#endif
seg->cache.u.segment.avl = 0;
return;
}
#endif
#if BX_CPU_LEVEL >= 2
if (protected_mode()) {
if (seg == &BX_CPU_THIS_PTR sregs[BX_SREG_SS]) {
Bit16u index;
Bit8u ti;
Bit8u rpl;
bx_descriptor_t descriptor;
Bit32u dword1, dword2;
if ((new_value & 0xfffc) == 0) { /* null selector */
BX_PANIC(("load_seg_reg: SS: new_value == 0"));
exception(BX_GP_EXCEPTION, 0, 0);
return;
}
index = new_value >> 3;
ti = (new_value >> 2) & 0x01;
rpl = (new_value & 0x03);
/* examine AR byte of destination selector for legal values: */
if (ti == 0) { /* GDT */
if ((index*8 + 7) > BX_CPU_THIS_PTR gdtr.limit) {
BX_PANIC(("load_seg_reg: GDT: %s: index(%04x*8+7) > limit(%06x)",
BX_CPU_THIS_PTR strseg(seg), (unsigned) index, (unsigned) BX_CPU_THIS_PTR gdtr.limit));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
access_linear(BX_CPU_THIS_PTR gdtr.base + index*8, 4, 0,
BX_READ, &dword1);
access_linear(BX_CPU_THIS_PTR gdtr.base + index*8 + 4, 4, 0,
BX_READ, &dword2);
}
else { /* LDT */
if (BX_CPU_THIS_PTR ldtr.cache.valid==0) { /* ??? */
BX_ERROR(("load_seg_reg: LDT invalid"));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
if ((index*8 + 7) > BX_CPU_THIS_PTR ldtr.cache.u.ldt.limit) {
BX_ERROR(("load_seg_reg ss: LDT: index > limit"));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
access_linear(BX_CPU_THIS_PTR ldtr.cache.u.ldt.base + index*8, 4, 0,
BX_READ, &dword1);
access_linear(BX_CPU_THIS_PTR ldtr.cache.u.ldt.base + index*8 + 4, 4, 0,
BX_READ, &dword2);
}
/* selector's RPL must = CPL, else #GP(selector) */
if (rpl != CPL) {
BX_ERROR(("load_seg_reg(): rpl != CPL"));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
parse_descriptor(dword1, dword2, &descriptor);
if (descriptor.valid==0) {
BX_ERROR(("load_seg_reg(): valid bit cleared"));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
/* AR byte must indicate a writable data segment else #GP(selector) */
if ( (descriptor.segment==0) ||
descriptor.u.segment.executable ||
descriptor.u.segment.r_w==0 ) {
BX_ERROR(("load_seg_reg(): not writable data segment"));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
}
/* DPL in the AR byte must equal CPL else #GP(selector) */
if (descriptor.dpl != CPL) {
BX_ERROR(("load_seg_reg(): dpl != CPL"));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
}
/* segment must be marked PRESENT else #SS(selector) */
if (descriptor.p == 0) {
BX_ERROR(("load_seg_reg(): not present"));
exception(BX_SS_EXCEPTION, new_value & 0xfffc, 0);
}
/* load SS with selector, load SS cache with descriptor */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.value = new_value;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.index = index;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.ti = ti;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.rpl = rpl;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache = descriptor;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid = 1;
/* now set accessed bit in descriptor */
dword2 |= 0x0100;
if (ti == 0) { /* GDT */
access_linear(BX_CPU_THIS_PTR gdtr.base + index*8 + 4, 4, 0,
BX_WRITE, &dword2);
}
else { /* LDT */
access_linear(BX_CPU_THIS_PTR ldtr.cache.u.ldt.base + index*8 + 4, 4, 0,
BX_WRITE, &dword2);
}
return;
}
else if ( (seg==&BX_CPU_THIS_PTR sregs[BX_SREG_DS]) ||
(seg==&BX_CPU_THIS_PTR sregs[BX_SREG_ES])
#if BX_CPU_LEVEL >= 3
|| (seg==&BX_CPU_THIS_PTR sregs[BX_SREG_FS]) ||
(seg==&BX_CPU_THIS_PTR sregs[BX_SREG_GS])
#endif
) {
Bit16u index;
Bit8u ti;
Bit8u rpl;
bx_descriptor_t descriptor;
Bit32u dword1, dword2;
if ((new_value & 0xfffc) == 0) { /* null selector */
seg->selector.index = 0;
seg->selector.ti = 0;
seg->selector.rpl = 0;
seg->selector.value = 0;
seg->cache.valid = 0; /* invalidate null selector */
return;
}
index = new_value >> 3;
ti = (new_value >> 2) & 0x01;
rpl = (new_value & 0x03);
/* selector index must be within descriptor limits, else #GP(selector) */
if (ti == 0) { /* GDT */
if ((index*8 + 7) > BX_CPU_THIS_PTR gdtr.limit) {
BX_ERROR(("load_seg_reg: GDT: %s: index(%04x) > limit(%06x)",
BX_CPU_THIS_PTR strseg(seg), (unsigned) index, (unsigned) BX_CPU_THIS_PTR gdtr.limit));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
access_linear(BX_CPU_THIS_PTR gdtr.base + index*8, 4, 0,
BX_READ, &dword1);
access_linear(BX_CPU_THIS_PTR gdtr.base + index*8 + 4, 4, 0,
BX_READ, &dword2);
}
else { /* LDT */
if (BX_CPU_THIS_PTR ldtr.cache.valid==0) {
BX_ERROR(("load_seg_reg: LDT invalid"));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
if ((index*8 + 7) > BX_CPU_THIS_PTR ldtr.cache.u.ldt.limit) {
BX_ERROR(("load_seg_reg ds,es: LDT: index > limit"));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
access_linear(BX_CPU_THIS_PTR ldtr.cache.u.ldt.base + index*8, 4, 0,
BX_READ, &dword1);
access_linear(BX_CPU_THIS_PTR ldtr.cache.u.ldt.base + index*8 + 4, 4, 0,
BX_READ, &dword2);
}
parse_descriptor(dword1, dword2, &descriptor);
if (descriptor.valid==0) {
BX_ERROR(("load_seg_reg(): valid bit cleared"));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
/* AR byte must indicate data or readable code segment else #GP(selector) */
if ( descriptor.segment==0 ||
(descriptor.u.segment.executable==1 &&
descriptor.u.segment.r_w==0) ) {
BX_ERROR(("load_seg_reg(): not data or readable code"));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
/* If data or non-conforming code, then both the RPL and the CPL
* must be less than or equal to DPL in AR byte else #GP(selector) */
if ( descriptor.u.segment.executable==0 ||
descriptor.u.segment.c_ed==0 ) {
if ((rpl > descriptor.dpl) || (CPL > descriptor.dpl)) {
BX_ERROR(("load_seg_reg: RPL & CPL must be <= DPL"));
exception(BX_GP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
}
/* segment must be marked PRESENT else #NP(selector) */
if (descriptor.p == 0) {
BX_ERROR(("load_seg_reg: segment not present"));
exception(BX_NP_EXCEPTION, new_value & 0xfffc, 0);
return;
}
/* load segment register with selector */
/* load segment register-cache with descriptor */
seg->selector.value = new_value;
seg->selector.index = index;
seg->selector.ti = ti;
seg->selector.rpl = rpl;
seg->cache = descriptor;
seg->cache.valid = 1;
/* now set accessed bit in descriptor */
/* wmr: don't bother if it's already set (thus allowing */
/* GDT to be in read-only pages like real hdwe does) */
if (!(dword2 & 0x0100)) {
dword2 |= 0x0100;
if (ti == 0) { /* GDT */
access_linear(BX_CPU_THIS_PTR gdtr.base + index*8 + 4, 4, 0,
BX_WRITE, &dword2);
}
else { /* LDT */
access_linear(BX_CPU_THIS_PTR ldtr.cache.u.ldt.base + index*8 + 4, 4, 0,
BX_WRITE, &dword2);
}
}
return;
}
else {
BX_PANIC(("load_seg_reg(): invalid segment register passed!"));
return;
}
}
/* real mode */
/* seg->limit = ; ??? different behaviours depening on seg reg. */
/* something about honoring previous values */
/* ??? */
if (seg == &BX_CPU_THIS_PTR sregs[BX_SREG_CS]) {
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value = new_value;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.segment = 1; /* regular segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.executable = 1; /* code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.c_ed = 0; /* expand up */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.r_w = 1; /* writeable */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.a = 1; /* accessed */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.base = new_value << 4;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xffff;
#if BX_CPU_LEVEL >= 3
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.g = 0; /* byte granular */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b = 0; /* default 16bit size */
#if BX_SUPPORT_X86_64
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l = 0; /* default 16bit size */
#endif
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.avl = 0;
#endif
}
else { /* SS, DS, ES, FS, GS */
seg->selector.value = new_value;
seg->cache.valid = 1;
seg->cache.p = 1; // set this???
seg->cache.u.segment.base = new_value << 4;
seg->cache.segment = 1; /* regular segment */
seg->cache.u.segment.a = 1; /* accessed */
/* set G, D_B, AVL bits here ??? */
}
#else /* 8086 */
seg->selector.value = new_value;
seg->cache.u.segment.base = new_value << 4;
#endif
}
#if BX_CPU_LEVEL >= 2
void
BX_CPU_C::parse_selector(Bit16u raw_selector, bx_selector_t *selector)
{
selector->value = raw_selector;
selector->index = raw_selector >> 3;
selector->ti = (raw_selector >> 2) & 0x01;
selector->rpl = raw_selector & 0x03;
}
#endif
void
BX_CPU_C::parse_descriptor(Bit32u dword1, Bit32u dword2, bx_descriptor_t *temp)
{
Bit8u AR_byte;
AR_byte = dword2 >> 8;
temp->p = (AR_byte >> 7) & 0x01;
temp->dpl = (AR_byte >> 5) & 0x03;
temp->segment = (AR_byte >> 4) & 0x01;
temp->type = (AR_byte & 0x0f);
temp->valid = 0; /* start out invalid */
if (temp->segment) { /* data/code segment descriptors */
temp->u.segment.executable = (AR_byte >> 3) & 0x01;
temp->u.segment.c_ed = (AR_byte >> 2) & 0x01;
temp->u.segment.r_w = (AR_byte >> 1) & 0x01;
temp->u.segment.a = (AR_byte >> 0) & 0x01;
temp->u.segment.limit = (dword1 & 0xffff);
temp->u.segment.base = (dword1 >> 16) |
((dword2 & 0xFF) << 16);
#if BX_CPU_LEVEL >= 3
temp->u.segment.limit |= (dword2 & 0x000F0000);
temp->u.segment.g = (dword2 & 0x00800000) > 0;
temp->u.segment.d_b = (dword2 & 0x00400000) > 0;
#if BX_SUPPORT_X86_64
temp->u.segment.l = (dword2 & 0x00200000) > 0;
#endif
temp->u.segment.avl = (dword2 & 0x00100000) > 0;
temp->u.segment.base |= (dword2 & 0xFF000000);
if (temp->u.segment.g) {
if ( (temp->u.segment.executable==0) && (temp->u.segment.c_ed) )
temp->u.segment.limit_scaled = (temp->u.segment.limit << 12);
else
temp->u.segment.limit_scaled = (temp->u.segment.limit << 12) | 0x0fff;
}
else
#endif
temp->u.segment.limit_scaled = temp->u.segment.limit;
temp->valid = 1;
}
else { // system & gate segment descriptors
switch ( temp->type ) {
case 0: // reserved
case 8: // reserved
case 10: // reserved
case 13: // reserved
temp->valid = 0;
break;
case 1: // 286 TSS (available)
case 3: // 286 TSS (busy)
temp->u.tss286.base = (dword1 >> 16) |
((dword2 & 0xff) << 16);
temp->u.tss286.limit = (dword1 & 0xffff);
temp->valid = 1;
break;
case 2: // LDT descriptor
temp->u.ldt.base = (dword1 >> 16) |
((dword2 & 0xFF) << 16);
#if BX_CPU_LEVEL >= 3
temp->u.ldt.base |= (dword2 & 0xff000000);
#endif
temp->u.ldt.limit = (dword1 & 0xffff);
temp->valid = 1;
break;
case 4: // 286 call gate
case 6: // 286 interrupt gate
case 7: // 286 trap gate
/* word count only used for call gate */
temp->u.gate286.word_count = dword2 & 0x1f;
temp->u.gate286.dest_selector = dword1 >> 16;;
temp->u.gate286.dest_offset = dword1 & 0xffff;
temp->valid = 1;
break;
case 5: // 286/386 task gate
temp->u.taskgate.tss_selector = dword1 >> 16;;
temp->valid = 1;
break;
#if BX_CPU_LEVEL >= 3
case 9: // 386 TSS (available)
case 11: // 386 TSS (busy)
temp->u.tss386.base = (dword1 >> 16) |
((dword2 & 0xff) << 16) |
(dword2 & 0xff000000);
temp->u.tss386.limit = (dword1 & 0x0000ffff) |
(dword2 & 0x000f0000);
temp->u.tss386.g = (dword2 & 0x00800000) > 0;
temp->u.tss386.avl = (dword2 & 0x00100000) > 0;
if (temp->u.tss386.g)
temp->u.tss386.limit_scaled = (temp->u.tss386.limit << 12) | 0x0fff;
else
temp->u.tss386.limit_scaled = temp->u.tss386.limit;
temp->valid = 1;
break;
case 12: // 386 call gate
case 14: // 386 interrupt gate
case 15: // 386 trap gate
// word count only used for call gate
temp->u.gate386.dword_count = dword2 & 0x1f;
temp->u.gate386.dest_selector = dword1 >> 16;;
temp->u.gate386.dest_offset = (dword2 & 0xffff0000) |
(dword1 & 0x0000ffff);
temp->valid = 1;
break;
#endif
default: BX_PANIC(("parse_descriptor(): case %d unfinished",
(unsigned) temp->type));
temp->valid = 0;
}
}
}
void
BX_CPU_C::load_ldtr(bx_selector_t *selector, bx_descriptor_t *descriptor)
{
/* check for null selector, if so invalidate LDTR */
if ( (selector->value & 0xfffc)==0 ) {
BX_CPU_THIS_PTR ldtr.selector = *selector;
BX_CPU_THIS_PTR ldtr.cache.valid = 0;
return;
}
if (!descriptor)
BX_PANIC(("load_ldtr(): descriptor == NULL!"));
BX_CPU_THIS_PTR ldtr.cache = *descriptor; /* whole structure copy */
BX_CPU_THIS_PTR ldtr.selector = *selector;
if (BX_CPU_THIS_PTR ldtr.cache.u.ldt.limit < 7) {
BX_PANIC(("load_ldtr(): ldtr.limit < 7"));
}
BX_CPU_THIS_PTR ldtr.cache.valid = 1;
}
void
BX_CPU_C::load_cs(bx_selector_t *selector, bx_descriptor_t *descriptor,
Bit8u cpl)
{
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector = *selector;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache = *descriptor;
/* caller may request different CPL then in selector */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.rpl = cpl;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.valid = 1; /* ??? */
// (BW) Added cpl to the selector value.
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value =
(0xfffc & BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value) | cpl;
#if BX_SUPPORT_X86_64
if (BX_CPU_THIS_PTR msr.lma) {
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.l) {
BX_CPU_THIS_PTR cpu_mode = BX_MODE_LONG_64;
}
else {
BX_CPU_THIS_PTR cpu_mode = BX_MODE_LONG_COMPAT;
}
}
#endif
}
void
BX_CPU_C::load_ss(bx_selector_t *selector, bx_descriptor_t *descriptor, Bit8u cpl)
{
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector = *selector;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache = *descriptor;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.rpl = cpl;
if ( (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.value & 0xfffc) == 0 )
BX_PANIC(("load_ss(): null selector passed"));
if ( !BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid ) {
BX_PANIC(("load_ss(): invalid selector/descriptor passed."));
}
}
#if BX_SUPPORT_X86_64
void
BX_CPU_C::load_ss_null(bx_selector_t *selector, bx_descriptor_t *descriptor, Bit8u cpl)
{
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector = *selector;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache = *descriptor;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.rpl = cpl;
}
#endif
#if BX_CPU_LEVEL >= 2
void
BX_CPU_C::fetch_raw_descriptor(bx_selector_t *selector,
Bit32u *dword1, Bit32u *dword2, Bit8u exception_no)
{
if (selector->ti == 0) { /* GDT */
if ((selector->index*8 + 7) > BX_CPU_THIS_PTR gdtr.limit) {
BX_INFO(("-----------------------------------"));
BX_INFO(("selector->index*8 + 7 = %u", (unsigned) selector->index*8 + 7));
BX_INFO(("gdtr.limit = %u", (unsigned) BX_CPU_THIS_PTR gdtr.limit));
BX_INFO(("fetch_raw_descriptor: GDT: index > limit"));
debug(BX_CPU_THIS_PTR prev_eip);
BX_INFO(("-----------------------------------"));
exception(exception_no, selector->value & 0xfffc, 0);
return;
}
access_linear(BX_CPU_THIS_PTR gdtr.base + selector->index*8, 4, 0,
BX_READ, dword1);
access_linear(BX_CPU_THIS_PTR gdtr.base + selector->index*8 + 4, 4, 0,
BX_READ, dword2);
}
else { /* LDT */
if (BX_CPU_THIS_PTR ldtr.cache.valid==0) {
BX_PANIC(("fetch_raw_descriptor: LDTR.valid=0"));
}
if ((selector->index*8 + 7) > BX_CPU_THIS_PTR ldtr.cache.u.ldt.limit) {
BX_PANIC(("fetch_raw_descriptor: LDT: index > limit"));
exception(exception_no, selector->value & 0xfffc, 0);
return;
}
access_linear(BX_CPU_THIS_PTR ldtr.cache.u.ldt.base + selector->index*8, 4, 0,
BX_READ, dword1);
access_linear(BX_CPU_THIS_PTR ldtr.cache.u.ldt.base + selector->index*8 + 4, 4, 0,
BX_READ, dword2);
}
}
#endif
Boolean
BX_CPU_C::fetch_raw_descriptor2(bx_selector_t *selector,
Bit32u *dword1, Bit32u *dword2)
{
if (selector->ti == 0) { /* GDT */
if ((selector->index*8 + 7) > BX_CPU_THIS_PTR gdtr.limit)
return(0);
access_linear(BX_CPU_THIS_PTR gdtr.base + selector->index*8, 4, 0,
BX_READ, dword1);
access_linear(BX_CPU_THIS_PTR gdtr.base + selector->index*8 + 4, 4, 0,
BX_READ, dword2);
return(1);
}
else { /* LDT */
if ((selector->index*8 + 7) > BX_CPU_THIS_PTR ldtr.cache.u.ldt.limit)
return(0);
access_linear(BX_CPU_THIS_PTR ldtr.cache.u.ldt.base + selector->index*8, 4, 0,
BX_READ, dword1);
access_linear(BX_CPU_THIS_PTR ldtr.cache.u.ldt.base + selector->index*8 + 4, 4, 0,
BX_READ, dword2);
return(1);
}
}
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