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Bochs/bochs/cpu/init.cc

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- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
2001-04-10 05:04:59 +04:00
// Copyright (C) 2000 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
#include "bochs.h"
/* the device id and stepping id are loaded into DH & DL upon processor
startup. for device id: 3 = 80386, 4 = 80486. just make up a
number for the stepping (revision) id. */
#define BX_DEVICE_ID 3
#define BX_STEPPING_ID 0
BX_CPU_C::BX_CPU_C(void)
{
// BX_CPU_C constructor
bx_printf("(%u)BX_CPU_C::BX_CPU_C(void) called\n", BX_SIM_ID);
/* hack for the following fields. Its easier to decode mod-rm bytes if
you can assume there's always a base & index register used. For
modes which don't really use them, point to an empty (zeroed) register.
*/
empty_register = 0;
// 16bit address mode base register, used for mod-rm decoding
_16bit_base_reg[0] = &gen_reg[BX_16BIT_REG_BX].word.rx;
_16bit_base_reg[1] = &gen_reg[BX_16BIT_REG_BX].word.rx;
_16bit_base_reg[2] = &gen_reg[BX_16BIT_REG_BP].word.rx;
_16bit_base_reg[3] = &gen_reg[BX_16BIT_REG_BP].word.rx;
_16bit_base_reg[4] = (Bit16u*) &empty_register;
_16bit_base_reg[5] = (Bit16u*) &empty_register;
_16bit_base_reg[6] = &gen_reg[BX_16BIT_REG_BP].word.rx;
_16bit_base_reg[7] = &gen_reg[BX_16BIT_REG_BX].word.rx;
// 16bit address mode index register, used for mod-rm decoding
_16bit_index_reg[0] = &gen_reg[BX_16BIT_REG_SI].word.rx;
_16bit_index_reg[1] = &gen_reg[BX_16BIT_REG_DI].word.rx;
_16bit_index_reg[2] = &gen_reg[BX_16BIT_REG_SI].word.rx;
_16bit_index_reg[3] = &gen_reg[BX_16BIT_REG_DI].word.rx;
_16bit_index_reg[4] = &gen_reg[BX_16BIT_REG_SI].word.rx;
_16bit_index_reg[5] = &gen_reg[BX_16BIT_REG_DI].word.rx;
_16bit_index_reg[6] = (Bit16u*) &empty_register;
_16bit_index_reg[7] = (Bit16u*) &empty_register;
// for decoding instructions: access to seg reg's via index number
sreg_mod00_rm16[0] = BX_SEG_REG_DS;
sreg_mod00_rm16[1] = BX_SEG_REG_DS;
sreg_mod00_rm16[2] = BX_SEG_REG_SS;
sreg_mod00_rm16[3] = BX_SEG_REG_SS;
sreg_mod00_rm16[4] = BX_SEG_REG_DS;
sreg_mod00_rm16[5] = BX_SEG_REG_DS;
sreg_mod00_rm16[6] = BX_SEG_REG_DS;
sreg_mod00_rm16[7] = BX_SEG_REG_DS;
sreg_mod01_rm16[0] = BX_SEG_REG_DS;
sreg_mod01_rm16[1] = BX_SEG_REG_DS;
sreg_mod01_rm16[2] = BX_SEG_REG_SS;
sreg_mod01_rm16[3] = BX_SEG_REG_SS;
sreg_mod01_rm16[4] = BX_SEG_REG_DS;
sreg_mod01_rm16[5] = BX_SEG_REG_DS;
sreg_mod01_rm16[6] = BX_SEG_REG_SS;
sreg_mod01_rm16[7] = BX_SEG_REG_DS;
sreg_mod10_rm16[0] = BX_SEG_REG_DS;
sreg_mod10_rm16[1] = BX_SEG_REG_DS;
sreg_mod10_rm16[2] = BX_SEG_REG_SS;
sreg_mod10_rm16[3] = BX_SEG_REG_SS;
sreg_mod10_rm16[4] = BX_SEG_REG_DS;
sreg_mod10_rm16[5] = BX_SEG_REG_DS;
sreg_mod10_rm16[6] = BX_SEG_REG_SS;
sreg_mod10_rm16[7] = BX_SEG_REG_DS;
// the default segment to use for a one-byte modrm with mod==01b
// and rm==i
//
sreg_mod01_rm32[0] = BX_SEG_REG_DS;
sreg_mod01_rm32[1] = BX_SEG_REG_DS;
sreg_mod01_rm32[2] = BX_SEG_REG_DS;
sreg_mod01_rm32[3] = BX_SEG_REG_DS;
sreg_mod01_rm32[4] = BX_SEG_REG_NULL;
// this entry should never be accessed
// (escape to 2-byte)
sreg_mod01_rm32[5] = BX_SEG_REG_SS;
sreg_mod01_rm32[6] = BX_SEG_REG_DS;
sreg_mod01_rm32[7] = BX_SEG_REG_DS;
// the default segment to use for a one-byte modrm with mod==10b
// and rm==i
//
sreg_mod10_rm32[0] = BX_SEG_REG_DS;
sreg_mod10_rm32[1] = BX_SEG_REG_DS;
sreg_mod10_rm32[2] = BX_SEG_REG_DS;
sreg_mod10_rm32[3] = BX_SEG_REG_DS;
sreg_mod10_rm32[4] = BX_SEG_REG_NULL;
// this entry should never be accessed
// (escape to 2-byte)
sreg_mod10_rm32[5] = BX_SEG_REG_SS;
sreg_mod10_rm32[6] = BX_SEG_REG_DS;
sreg_mod10_rm32[7] = BX_SEG_REG_DS;
// the default segment to use for a two-byte modrm with mod==00b
// and base==i
//
sreg_mod0_base32[0] = BX_SEG_REG_DS;
sreg_mod0_base32[1] = BX_SEG_REG_DS;
sreg_mod0_base32[2] = BX_SEG_REG_DS;
sreg_mod0_base32[3] = BX_SEG_REG_DS;
sreg_mod0_base32[4] = BX_SEG_REG_SS;
sreg_mod0_base32[5] = BX_SEG_REG_DS;
sreg_mod0_base32[6] = BX_SEG_REG_DS;
sreg_mod0_base32[7] = BX_SEG_REG_DS;
// the default segment to use for a two-byte modrm with
// mod==01b or mod==10b and base==i
sreg_mod1or2_base32[0] = BX_SEG_REG_DS;
sreg_mod1or2_base32[1] = BX_SEG_REG_DS;
sreg_mod1or2_base32[2] = BX_SEG_REG_DS;
sreg_mod1or2_base32[3] = BX_SEG_REG_DS;
sreg_mod1or2_base32[4] = BX_SEG_REG_SS;
sreg_mod1or2_base32[5] = BX_SEG_REG_SS;
sreg_mod1or2_base32[6] = BX_SEG_REG_DS;
sreg_mod1or2_base32[7] = BX_SEG_REG_DS;
#if BX_DYNAMIC_TRANSLATION
DTWrite8vShim = NULL;
DTWrite16vShim = NULL;
DTWrite32vShim = NULL;
DTRead8vShim = NULL;
DTRead16vShim = NULL;
DTRead32vShim = NULL;
DTReadRMW8vShim = (BxDTShim_t) DTASReadRMW8vShim;
fprintf(stderr, "DTReadRMW8vShim is %x\n", (unsigned) DTReadRMW8vShim);
fprintf(stderr, "&DTReadRMW8vShim is %x\n", (unsigned) &DTReadRMW8vShim);
DTReadRMW16vShim = NULL;
DTReadRMW32vShim = NULL;
DTWriteRMW8vShim = (BxDTShim_t) DTASWriteRMW8vShim;
DTWriteRMW16vShim = NULL;
DTWriteRMW32vShim = NULL;
DTSetFlagsOSZAPCPtr = (BxDTShim_t) DTASSetFlagsOSZAPC;
DTIndBrHandler = (BxDTShim_t) DTASIndBrHandler;
DTDirBrHandler = (BxDTShim_t) DTASDirBrHandler;
#endif
BX_INSTR_INIT();
}
BX_CPU_C::~BX_CPU_C(void)
{
bx_printf("(%u)BX_CPU_C::~BX_CPU_C(void) called\n", BX_SIM_ID);
BX_INSTR_SHUTDOWN();
}
void
BX_CPU_C::reset(unsigned source)
{
UNUSED(source); // either BX_RESET_HARDWARE or BX_RESET_SOFTWARE
// general registers
EAX = 0; // processor passed test :-)
EBX = 0; // undefined
ECX = 0; // undefined
EDX = (BX_DEVICE_ID << 8) | BX_STEPPING_ID; // ???
EBP = 0; // undefined
ESI = 0; // undefined
EDI = 0; // undefined
ESP = 0; // undefined
// all status flags at known values, use BX_CPU_THIS_PTR eflags structure
BX_CPU_THIS_PTR lf_flags_status = 0x000000;
BX_CPU_THIS_PTR lf_pf = 0;
// status and control flags register set
BX_CPU_THIS_PTR set_CF(0);
BX_CPU_THIS_PTR eflags.bit1 = 1;
BX_CPU_THIS_PTR set_PF(0);
BX_CPU_THIS_PTR eflags.bit3 = 0;
BX_CPU_THIS_PTR set_AF(0);
BX_CPU_THIS_PTR eflags.bit5 = 0;
BX_CPU_THIS_PTR set_ZF(0);
BX_CPU_THIS_PTR set_SF(0);
BX_CPU_THIS_PTR eflags.tf = 0;
BX_CPU_THIS_PTR eflags.if_ = 0;
BX_CPU_THIS_PTR eflags.df = 0;
BX_CPU_THIS_PTR set_OF(0);
#if BX_CPU_LEVEL >= 2
BX_CPU_THIS_PTR eflags.iopl = 0;
BX_CPU_THIS_PTR eflags.nt = 0;
#endif
BX_CPU_THIS_PTR eflags.bit15 = 0;
#if BX_CPU_LEVEL >= 3
BX_CPU_THIS_PTR eflags.rf = 0;
BX_CPU_THIS_PTR eflags.vm = 0;
#endif
#if BX_CPU_LEVEL >= 4
BX_CPU_THIS_PTR eflags.ac = 0;
#endif
BX_CPU_THIS_PTR inhibit_mask = 0;
BX_CPU_THIS_PTR debug_trap = 0;
/* instruction pointer */
#if BX_CPU_LEVEL < 2
BX_CPU_THIS_PTR prev_eip =
BX_CPU_THIS_PTR eip = 0x00000000;
#else /* from 286 up */
BX_CPU_THIS_PTR prev_eip =
BX_CPU_THIS_PTR eip = 0x0000FFF0;
#endif
/* CS (Code Segment) and descriptor cache */
/* Note: on a real cpu, CS initially points to upper memory. After
* the 1st jump, the descriptor base is zero'd out. Since I'm just
* going to jump to my BIOS, I don't need to do this.
* For future reference:
* processor cs.selector cs.base cs.limit EIP
* 8086 FFFF FFFF0 FFFF 0000
* 286 F000 FF0000 FFFF FFF0
* 386+ F000 FFFF0000 FFFF FFF0
*/
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value = 0xf000;
#if BX_CPU_LEVEL >= 2
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.index = 0x0000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.ti = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.rpl = 0;
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; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.type = 3; /* read/write access */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.executable = 1; /* data/stack segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.c_ed = 0; /* normal 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 = 0x000F0000;
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;
#endif
#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; /* 16bit default size */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.avl = 0;
#endif
/* SS (Stack Segment) and descriptor cache */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.value = 0x0000;
#if BX_CPU_LEVEL >= 2
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.index = 0x0000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.ti = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.rpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.type = 3; /* read/write access */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.executable = 0; /* data/stack segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.c_ed = 0; /* normal expand up */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.r_w = 1; /* writeable */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.a = 1; /* accessed */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.base = 0x00000000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit = 0xFFFF;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled = 0xFFFF;
#endif
#if BX_CPU_LEVEL >= 3
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.g = 0; /* byte granular */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b = 0; /* 16bit default size */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.avl = 0;
#endif
/* DS (Data Segment) and descriptor cache */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].selector.value = 0x0000;
#if BX_CPU_LEVEL >= 2
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].selector.index = 0x0000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].selector.ti = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].selector.rpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.type = 3; /* read/write access */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.executable = 0; /* data/stack segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.c_ed = 0; /* normal expand up */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.r_w = 1; /* writeable */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.a = 1; /* accessed */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.base = 0x00000000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.limit = 0xFFFF;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.limit_scaled = 0xFFFF;
#endif
#if BX_CPU_LEVEL >= 3
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.g = 0; /* byte granular */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.d_b = 0; /* 16bit default size */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.avl = 0;
#endif
/* ES (Extra Segment) and descriptor cache */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].selector.value = 0x0000;
#if BX_CPU_LEVEL >= 2
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].selector.index = 0x0000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].selector.ti = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].selector.rpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.type = 3; /* read/write access */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.executable = 0; /* data/stack segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.c_ed = 0; /* normal expand up */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.r_w = 1; /* writeable */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.a = 1; /* accessed */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.base = 0x00000000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.limit = 0xFFFF;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.limit_scaled = 0xFFFF;
#endif
#if BX_CPU_LEVEL >= 3
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.g = 0; /* byte granular */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.d_b = 0; /* 16bit default size */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.avl = 0;
#endif
/* FS and descriptor cache */
#if BX_CPU_LEVEL >= 3
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].selector.value = 0x0000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].selector.index = 0x0000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].selector.ti = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].selector.rpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.type = 3; /* read/write access */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.executable = 0; /* data/stack segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.c_ed = 0; /* normal expand up */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.r_w = 1; /* writeable */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.a = 1; /* accessed */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.base = 0x00000000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.limit = 0xFFFF;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.limit_scaled = 0xFFFF;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.g = 0; /* byte granular */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.d_b = 0; /* 16bit default size */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.avl = 0;
#endif
/* GS and descriptor cache */
#if BX_CPU_LEVEL >= 3
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].selector.value = 0x0000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].selector.index = 0x0000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].selector.ti = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].selector.rpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.dpl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.segment = 1; /* data/code segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.type = 3; /* read/write access */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.executable = 0; /* data/stack segment */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.c_ed = 0; /* normal expand up */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.r_w = 1; /* writeable */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.a = 1; /* accessed */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.base = 0x00000000;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.limit = 0xFFFF;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.limit_scaled = 0xFFFF;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.g = 0; /* byte granular */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.d_b = 0; /* 16bit default size */
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.avl = 0;
#endif
/* GDTR (Global Descriptor Table Register) */
#if BX_CPU_LEVEL >= 2
BX_CPU_THIS_PTR gdtr.base = 0x00000000; /* undefined */
BX_CPU_THIS_PTR gdtr.limit = 0x0000; /* undefined */
/* ??? AR=Present, Read/Write */
#endif
/* IDTR (Interrupt Descriptor Table Register) */
#if BX_CPU_LEVEL >= 2
BX_CPU_THIS_PTR idtr.base = 0x00000000;
BX_CPU_THIS_PTR idtr.limit = 0x03FF; /* always byte granular */ /* ??? */
/* ??? AR=Present, Read/Write */
#endif
/* LDTR (Local Descriptor Table Register) */
#if BX_CPU_LEVEL >= 2
BX_CPU_THIS_PTR ldtr.selector.value = 0x0000;
BX_CPU_THIS_PTR ldtr.selector.index = 0x0000;
BX_CPU_THIS_PTR ldtr.selector.ti = 0;
BX_CPU_THIS_PTR ldtr.selector.rpl = 0;
BX_CPU_THIS_PTR ldtr.cache.valid = 0; /* not valid */
BX_CPU_THIS_PTR ldtr.cache.p = 0; /* not present */
BX_CPU_THIS_PTR ldtr.cache.dpl = 0; /* field not used */
BX_CPU_THIS_PTR ldtr.cache.segment = 0; /* system segment */
BX_CPU_THIS_PTR ldtr.cache.type = 2; /* LDT descriptor */
BX_CPU_THIS_PTR ldtr.cache.u.ldt.base = 0x00000000;
BX_CPU_THIS_PTR ldtr.cache.u.ldt.limit = 0xFFFF;
#endif
/* TR (Task Register) */
#if BX_CPU_LEVEL >= 2
/* ??? I don't know what state the TR comes up in */
BX_CPU_THIS_PTR tr.selector.value = 0x0000;
BX_CPU_THIS_PTR tr.selector.index = 0x0000; /* undefined */
BX_CPU_THIS_PTR tr.selector.ti = 0;
BX_CPU_THIS_PTR tr.selector.rpl = 0;
BX_CPU_THIS_PTR tr.cache.valid = 0;
BX_CPU_THIS_PTR tr.cache.p = 0;
BX_CPU_THIS_PTR tr.cache.dpl = 0; /* field not used */
BX_CPU_THIS_PTR tr.cache.segment = 0;
BX_CPU_THIS_PTR tr.cache.type = 0; /* invalid */
BX_CPU_THIS_PTR tr.cache.u.tss286.base = 0x00000000; /* undefined */
BX_CPU_THIS_PTR tr.cache.u.tss286.limit = 0x0000; /* undefined */
#endif
// DR0 - DR7 (Debug Registers)
#if BX_CPU_LEVEL >= 3
BX_CPU_THIS_PTR dr0 = 0; /* undefined */
BX_CPU_THIS_PTR dr1 = 0; /* undefined */
BX_CPU_THIS_PTR dr2 = 0; /* undefined */
BX_CPU_THIS_PTR dr3 = 0; /* undefined */
#endif
#if BX_CPU_LEVEL == 3
BX_CPU_THIS_PTR dr6 = 0xFFFF1FF0;
BX_CPU_THIS_PTR dr7 = 0x00000400;
#elif BX_CPU_LEVEL == 4
BX_CPU_THIS_PTR dr6 = 0xFFFF1FF0;
BX_CPU_THIS_PTR dr7 = 0x00000400;
#elif BX_CPU_LEVEL == 5
BX_CPU_THIS_PTR dr6 = 0xFFFF0FF0;
BX_CPU_THIS_PTR dr7 = 0x00000400;
#else
# error "DR6,7: CPU > 5"
#endif
#if 0
/* test registers 3-7 (unimplemented) */
BX_CPU_THIS_PTR tr3 = 0; /* undefined */
BX_CPU_THIS_PTR tr4 = 0; /* undefined */
BX_CPU_THIS_PTR tr5 = 0; /* undefined */
BX_CPU_THIS_PTR tr6 = 0; /* undefined */
BX_CPU_THIS_PTR tr7 = 0; /* undefined */
#endif
#if BX_CPU_LEVEL >= 2
// MSW (Machine Status Word), so called on 286
// CR0 (Control Register 0), so called on 386+
BX_CPU_THIS_PTR cr0.ts = 0; // no task switch
BX_CPU_THIS_PTR cr0.em = 0; // emulate math coprocessor
BX_CPU_THIS_PTR cr0.mp = 0; // wait instructions not trapped
BX_CPU_THIS_PTR cr0.pe = 0; // real mode
BX_CPU_THIS_PTR cr0.val32 = 0;
#if BX_CPU_LEVEL >= 3
BX_CPU_THIS_PTR cr0.pg = 0; // paging disabled
// no change to cr0.val32
#endif
#if BX_CPU_LEVEL >= 4
BX_CPU_THIS_PTR cr0.cd = 1; // caching disabled
BX_CPU_THIS_PTR cr0.nw = 1; // not write-through
BX_CPU_THIS_PTR cr0.am = 0; // disable alignment check
BX_CPU_THIS_PTR cr0.wp = 0; // disable write-protect
BX_CPU_THIS_PTR cr0.ne = 0; // ndp exceptions through int 13H, DOS compat
BX_CPU_THIS_PTR cr0.val32 |= 0x60000000;
#endif
// handle reserved bits
#if BX_CPU_LEVEL == 3
// reserved bits all set to 1 on 386
BX_CPU_THIS_PTR cr0.val32 |= 0x7ffffff0;
#elif BX_CPU_LEVEL >= 4
// bit 4 is hardwired to 1 on all x86
BX_CPU_THIS_PTR cr0.val32 |= 0x00000010;
#endif
#endif // CPU >= 2
#if BX_CPU_LEVEL >= 3
BX_CPU_THIS_PTR cr2 = 0;
BX_CPU_THIS_PTR cr3 = 0;
#endif
#if BX_CPU_LEVEL >= 4
BX_CPU_THIS_PTR cr4 = 0;
#endif
BX_CPU_THIS_PTR EXT = 0;
BX_INTR = 0;
TLB_init();
BX_CPU_THIS_PTR bytesleft = 0;
BX_CPU_THIS_PTR fetch_ptr = NULL;
BX_CPU_THIS_PTR prev_linear_page = 0;
BX_CPU_THIS_PTR prev_phy_page = 0;
BX_CPU_THIS_PTR max_phy_addr = 0;
#if BX_DEBUGGER
#ifdef MAGIC_BREAKPOINT
BX_CPU_THIS_PTR magic_break = 0;
#endif
BX_CPU_THIS_PTR stop_reason = STOP_NO_REASON;
BX_CPU_THIS_PTR trace = 0;
#endif
// Init the Floating Point Unit
fpu_init();
#if BX_DYNAMIC_TRANSLATION
dynamic_init();
#endif
}
void
BX_CPU_C::sanity_checks(void)
{
Bit8u al, cl, dl, bl, ah, ch, dh, bh;
Bit16u ax, cx, dx, bx, sp, bp, si, di;
Bit32u eax, ecx, edx, ebx, esp, ebp, esi, edi;
EAX = 0xFFEEDDCC;
ECX = 0xBBAA9988;
EDX = 0x77665544;
EBX = 0x332211FF;
ESP = 0xEEDDCCBB;
EBP = 0xAA998877;
ESI = 0x66554433;
EDI = 0x2211FFEE;
al = AL;
cl = CL;
dl = DL;
bl = BL;
ah = AH;
ch = CH;
dh = DH;
bh = BH;
if ( al != (EAX & 0xFF) ||
cl != (ECX & 0xFF) ||
dl != (EDX & 0xFF) ||
bl != (EBX & 0xFF) ||
ah != ((EAX >> 8) & 0xFF) ||
ch != ((ECX >> 8) & 0xFF) ||
dh != ((EDX >> 8) & 0xFF) ||
bh != ((EBX >> 8) & 0xFF) ) {
bx_panic("problems using BX_READ_8BIT_REG()!\n");
}
ax = AX;
cx = CX;
dx = DX;
bx = BX;
sp = SP;
bp = BP;
si = SI;
di = DI;
if ( ax != (EAX & 0xFFFF) ||
cx != (ECX & 0xFFFF) ||
dx != (EDX & 0xFFFF) ||
bx != (EBX & 0xFFFF) ||
sp != (ESP & 0xFFFF) ||
bp != (EBP & 0xFFFF) ||
si != (ESI & 0xFFFF) ||
di != (EDI & 0xFFFF) ) {
bx_panic("problems using BX_READ_16BIT_REG()!\n");
}
eax = EAX;
ecx = ECX;
edx = EDX;
ebx = EBX;
esp = ESP;
ebp = EBP;
esi = ESI;
edi = EDI;
if (sizeof(Bit8u) != 1 || sizeof(Bit8s) != 1)
bx_panic("data type Bit8u or Bit8s is not of length 1 byte!\n");
if (sizeof(Bit16u) != 2 || sizeof(Bit16s) != 2)
bx_panic("data type Bit16u or Bit16s is not of length 2 bytes!\n");
if (sizeof(Bit32u) != 4 || sizeof(Bit32s) != 4)
bx_panic("data type Bit32u or Bit32s is not of length 4 bytes!\n");
fprintf(stderr, "#(%u)all sanity checks passed!\n", BX_SIM_ID);
}
void
BX_CPU_C::set_INTR(Boolean value)
{
BX_CPU_THIS_PTR async_event = 1;
}