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dosbox-staging/src/cpu/cpu.cpp

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/*
* Copyright (C) 2002-2003 The DOSBox Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "dosbox.h"
#include "cpu.h"
#include "memory.h"
#include "debug.h"
#include "keyboard.h"
#include "setup.h"
Flag_Info flags;
CPU_Regs cpu_regs;
CPUBlock cpu;
Segments Segs;
Bits CPU_Cycles=0;
Bits CPU_CycleLeft=0;
Bits CPU_CycleMax=1500;
CPU_Decoder * cpudecoder;
INLINE void CPU_Push16(Bitu value) {
if (cpu.state & STATE_STACK32) {
reg_esp-=2;
mem_writew(SegPhys(ss)+reg_esp,value);
} else {
reg_sp-=2;
mem_writew(SegPhys(ss)+reg_sp,value);
}
}
INLINE void CPU_Push32(Bitu value) {
if (cpu.state & STATE_STACK32) {
reg_esp-=4;
mem_writed(SegPhys(ss)+reg_esp,value);
} else {
reg_sp-=4;
mem_writed(SegPhys(ss)+reg_sp,value);
}
}
INLINE Bitu CPU_Pop16(void) {
if (cpu.state & STATE_STACK32) {
Bitu val=mem_readw(SegPhys(ss)+reg_esp);
reg_esp+=2;
return val;
} else {
Bitu val=mem_readw(SegPhys(ss)+reg_sp);
reg_sp+=2;
return val;
}
}
INLINE Bitu CPU_Pop32(void) {
if (cpu.state & STATE_STACK32) {
Bitu val=mem_readd(SegPhys(ss)+reg_esp);
reg_esp+=4;
return val;
} else {
Bitu val=mem_readd(SegPhys(ss)+reg_sp);
reg_sp+=4;
return val;
}
}
PhysPt SelBase(Bitu sel) {
if (cpu.cr0 & CR0_PROTECTION) {
Descriptor desc;
cpu.gdt.GetDescriptor(sel,desc);
return desc.GetBase();
} else {
return sel<<4;
}
}
bool CPU_CheckState(void) {
cpu.state=0;
if (!cpu.cr0 & CR0_PROTECTION) {
cpu.full.entry=cpu.full.prefix=0;
return true;
} else {
cpu.state|=STATE_PROTECTED;
if (Segs.big[cs]) {
cpu.state|=STATE_USE32;
cpu.full.entry=0x200;
cpu.full.prefix=0x02; /* PREFIX_ADDR */
} else {
cpu.full.entry=cpu.full.prefix=0;
}
if (Segs.big[ss]) cpu.state|=STATE_STACK32;
LOG_MSG("CPL Level %x at %X:%X",cpu.cpl,SegValue(cs),reg_eip);
}
return true;
}
Bit8u lastint;
bool Interrupt(Bitu num) {
lastint=num;
//DEBUG THINGIE to check fucked ints
#if C_DEBUG
switch (num) {
case 0x00:
LOG(LOG_CPU,"Divide Error");
break;
case 0x06:
break;
case 0x07:
LOG(LOG_FPU,"Co Processor Exception");
break;
case 0x08:
case 0x09:
case 0x10:
case 0x11:
case 0x12:
case 0x13:
case 0x15:
case 0x16:
case 0x17:
case 0x1A:
case 0x1C:
case 0x21:
case 0x2a:
case 0x2f:
case 0x33:
case 0x67:
case 0x74:
break;
case 0xcd:
#if C_HEAVY_DEBUG
LOG(LOG_CPU|LOG_ERROR,"Call to interrupt 0xCD this is BAD");
DEBUG_HeavyWriteLogInstruction();
#endif
E_Exit("Call to interrupt 0xCD this is BAD");
case 0x03:
if (DEBUG_Breakpoint()) return true;
break;
case 0x05:
LOG(LOG_CPU,"CPU:Out Of Bounds interrupt");
break;
default:
// LOG_WARN("Call to unsupported INT %02X call %02X",num,reg_ah);
break;
};
#endif
FILLFLAGS;
if (!(cpu.state & STATE_PROTECTED)) { /* RealMode Interrupt */
/* Save everything on a 16-bit stack */
CPU_Push16(flags.word & 0xffff);
CPU_Push16(SegValue(cs));
CPU_Push16(reg_ip);
SETFLAGBIT(IF,false);
SETFLAGBIT(TF,false);
/* Get the new CS:IP from vector table */
reg_eip=mem_readw(num << 2);
Segs.val[cs]=mem_readw((num << 2)+2);
Segs.phys[cs]=Segs.val[cs]<<4;
return true;
} else { /* Protected Mode Interrupt */
Descriptor gate;
//TODO Check for software interrupt and check gate's dpl<cpl
cpu.idt.GetDescriptor(num<<3,gate);
if (gate.DPL()<cpu.cpl) E_Exit("INT:Gate DPL<CPL");
switch (gate.Type()) {
case DESC_286_INT_GATE:
case DESC_386_INT_GATE:
SETFLAGBIT(IF,false);
case DESC_286_TRAP_GATE:
case DESC_386_TRAP_GATE:
{
Descriptor desc;
Bitu selector=gate.GetSelector();
Bitu offset=gate.GetOffset();
cpu.gdt.GetDescriptor(selector,desc);
Bitu dpl=desc.DPL();
if (dpl>cpu.cpl) E_Exit("Interrupt to higher privilege");
switch (desc.Type()) {
case DESC_CODE_N_NC_A: case DESC_CODE_N_NC_NA:
case DESC_CODE_R_NC_A: case DESC_CODE_R_NC_NA:
if (dpl<cpu.cpl) {
/* Prepare for gate to lower privilege */
E_Exit("Interrupt to lower privilege");
break;
}
case DESC_CODE_N_C_A: case DESC_CODE_N_C_NA:
case DESC_CODE_R_C_A: case DESC_CODE_R_C_NA:
/* Prepare stack for gate to same priviledge */
if (gate.Type() & 0x8) { /* 32-bit Gate */
CPU_Push32(flags.word & 0xffff);
CPU_Push32(SegValue(cs));
CPU_Push32(reg_eip);
} else { /* 16-bit gate */
CPU_Push16(flags.word & 0xffff);
CPU_Push16(SegValue(cs));
CPU_Push16(reg_ip);
}
break;
default:
E_Exit("INT:Gate Selector points to illegal descriptor with type %x",desc.Type());
}
SETFLAGBIT(TF,false);
SETFLAGBIT(NT,false);
Segs.val[cs]=(selector&0xfffc) | cpu.cpl;
Segs.phys[cs]=desc.GetBase();
Segs.big[cs]=desc.Big();
LOG_MSG("INT:Gate to %X:%X big %d %s",selector,reg_eip,desc.Big(),gate.Type() & 0x8 ? "386" : "286");
reg_eip=offset;
return CPU_CheckState();
}
default:
E_Exit("Illegal descriptor type %X for int %X",gate.Type(),num);
}
}
return true;
}
bool CPU_IRET(bool use32) {
if (!(cpu.state & STATE_PROTECTED)) { /*RealMode IRET */
if (use32) {
E_Exit("No support for IRETD in real mode");
} else {
reg_eip=CPU_Pop16();
SegSet16(cs,CPU_Pop16());
SETFLAGSw(CPU_Pop16());
}
return true;
} else { /* Protected mode IRET */
if (GETFLAG(NT)) E_Exit("No task support");
Bitu selector,offset,old_flags;
if (use32) {
offset=CPU_Pop32();
selector=CPU_Pop32() & 0xffff;
old_flags=CPU_Pop32();
if (old_flags & FLAG_VM) E_Exit("No vm86 support");
} else {
offset=CPU_Pop16();
selector=CPU_Pop16();
old_flags=CPU_Pop16();
}
Bitu rpl=selector & 3;
Descriptor desc;
cpu.gdt.GetDescriptor(selector,desc);
if (rpl<cpu.cpl) E_Exit("IRET to lower privilege");
if (cpu.cpl==rpl) {
/* Return to same level */
switch (desc.Type()) {
case DESC_CODE_N_NC_A: case DESC_CODE_N_NC_NA:
case DESC_CODE_R_NC_A: case DESC_CODE_R_NC_NA:
if (!(cpu.cpl==desc.DPL())) E_Exit("IRET:Same Level:NC:DPL!=CPL");
break;
case DESC_CODE_N_C_A: case DESC_CODE_N_C_NA:
case DESC_CODE_R_C_A: case DESC_CODE_R_C_NA:
if (!(desc.DPL()>=cpu.cpl)) E_Exit("IRET:Same level:C:DPL<CPL");
break;
default:
E_Exit("IRET from illegal descriptor type %X",desc.Type());
}
Segs.phys[cs]=desc.GetBase();
Segs.big[cs]=desc.Big();
Segs.val[cs]=(selector & 0xfffc) | cpu.cpl;;
reg_eip=offset;
SETFLAGSw(old_flags);
LOG_MSG("IRET:Same level return to %X:%X",selector,offset);
} else {
/* Return to higher privilege */
switch (desc.Type()) {
case DESC_CODE_N_NC_A: case DESC_CODE_N_NC_NA:
case DESC_CODE_R_NC_A: case DESC_CODE_R_NC_NA:
if (!(cpu.cpl==rpl)) E_Exit("IRET:Outer level:NC:RPL != DPL");
break;
case DESC_CODE_N_C_A: case DESC_CODE_N_C_NA:
case DESC_CODE_R_C_A: case DESC_CODE_R_C_NA:
if (!(desc.DPL()>cpu.cpl)) E_Exit("IRET:Outer level:C:DPL <= CPL");
break;
default:
E_Exit("IRET from illegal descriptor type %X",desc.Type());
}
Segs.phys[cs]=desc.GetBase();
Segs.big[cs]=desc.Big();
Segs.val[cs]=selector;
cpu.cpl=rpl;
reg_eip=offset;
Bitu new_ss,new_esp;
if (use32) {
new_esp=CPU_Pop32();
new_ss=CPU_Pop32() & 0xffff;
} else {
new_esp=CPU_Pop16();
new_ss=CPU_Pop16();
}
reg_esp=new_esp;
CPU_SetSegGeneral(ss,new_ss);
//TODO Maybe validate other segments, but why would anyone use them?
LOG_MSG("IRET:Outer level return to %X:%X",selector,offset);
}
return CPU_CheckState();
}
return false;
}
bool CPU_JMP(bool use32,Bitu selector,Bitu offset) {
if (!(cpu.state & STATE_PROTECTED)) {
if (!use32) {
reg_eip=offset&0xffff;
} else {
reg_eip=offset;
}
SegSet16(cs,selector);
return true;
} else {
Bitu rpl=selector & 3;
Descriptor desc;
cpu.gdt.GetDescriptor(selector,desc);
switch (desc.Type()) {
case DESC_CODE_N_NC_A: case DESC_CODE_N_NC_NA:
case DESC_CODE_R_NC_A: case DESC_CODE_R_NC_NA:
if (rpl>cpu.cpl) E_Exit("JMP:NC:RPL>CPL");
if (rpl!=desc.DPL()) E_Exit("JMP:NC:RPL != DPL");
cpu.cpl=desc.DPL();
LOG_MSG("JMP:Code:NC to %X:%X",selector,offset);
goto CODE_jmp;
case DESC_CODE_N_C_A: case DESC_CODE_N_C_NA:
case DESC_CODE_R_C_A: case DESC_CODE_R_C_NA:
LOG_MSG("JMP:Code:C to %X:%X",selector,offset);
CODE_jmp:
/* Normal jump to another selector:offset */
Segs.phys[cs]=desc.GetBase();
Segs.big[cs]=desc.Big();
Segs.val[cs]=(selector & 0xfffc) | cpu.cpl;
reg_eip=offset;
return CPU_CheckState();
default:
E_Exit("JMP Illegal descriptor type %X",desc.Type());
}
}
return false;
}
bool CPU_CALL(bool use32,Bitu selector,Bitu offset) {
if (!(cpu.state & STATE_PROTECTED)) {
if (!use32) {
CPU_Push16(SegValue(cs));
CPU_Push16(reg_ip);
reg_eip=offset&0xffff;
} else {
CPU_Push32(SegValue(cs));
CPU_Push32(reg_eip);
reg_eip=offset;
}
SegSet16(cs,selector);
return true;
} else {
Descriptor call;
Bitu rpl=selector & 3;
cpu.gdt.GetDescriptor(selector,call);
/* Check for type of far call */
switch (call.Type()) {
case DESC_CODE_N_NC_A:case DESC_CODE_N_NC_NA:
case DESC_CODE_R_NC_A:case DESC_CODE_R_NC_NA:
if (rpl>cpu.cpl) E_Exit("CALL:CODE:NC:RPL>CPL");
if (call.DPL()!=cpu.cpl) E_Exit("CALL:CODE:NC:DPL!=CPL");
LOG_MSG("CALL:CODE:NC to %X:%X",selector,offset);
goto call_code;
case DESC_CODE_N_C_A:case DESC_CODE_N_C_NA:
case DESC_CODE_R_C_A:case DESC_CODE_R_C_NA:
if (call.DPL()>cpu.cpl) E_Exit("CALL:CODE:C:DPL>CPL");
LOG_MSG("CALL:CODE:C to %X:%X",selector,offset);
call_code:
if (!use32) {
CPU_Push16(SegValue(cs));
CPU_Push16(reg_ip);
reg_eip=offset&0xffff;
} else {
CPU_Push32(SegValue(cs));
CPU_Push32(reg_eip);
reg_eip=offset;
}
Segs.phys[cs]=call.GetBase();
Segs.big[cs]=call.Big();
Segs.val[cs]=(selector & 0xfffc) | cpu.cpl;
reg_eip=offset;
return CPU_CheckState();
default:
E_Exit("CALL:Descriptor type %x unsupported",call.Type());
};
return CPU_CheckState();
}
return false;
}
bool CPU_RET(bool use32,Bitu bytes) {
if (!(cpu.state & STATE_PROTECTED)) {
Bitu new_ip,new_cs;
if (!use32) {
new_ip=CPU_Pop16();
new_cs=CPU_Pop16();
} else {
new_ip=CPU_Pop32();
new_cs=CPU_Pop32() & 0xffff;
}
reg_esp+=bytes;
SegSet16(cs,new_cs);
reg_eip=new_ip;
return true;
} else {
Bitu offset,selector;
if (!use32) {
offset=CPU_Pop16();
selector=CPU_Pop16();
} else {
offset=CPU_Pop32();
selector=CPU_Pop32() & 0xffff;
}
if (cpu.state & STATE_STACK32) {
reg_esp+=bytes;
} else {
reg_sp+=bytes;
}
Descriptor desc;
Bitu rpl=selector & 3;
if (rpl<cpu.cpl) E_Exit("RET to lower privilege");
cpu.gdt.GetDescriptor(selector,desc);
if (cpu.cpl==rpl) {
/* Return to same level */
switch (desc.Type()) {
case DESC_CODE_N_NC_A:case DESC_CODE_N_NC_NA:
case DESC_CODE_R_NC_A:case DESC_CODE_R_NC_NA:
if (!(cpu.cpl==desc.DPL())) E_Exit("RET to NC segment of other privilege");
goto RET_same_level;
case DESC_CODE_N_C_A:case DESC_CODE_N_C_NA:
case DESC_CODE_R_C_A:case DESC_CODE_R_C_NA:
if (!(desc.DPL()>=cpu.cpl)) E_Exit("RET to C segment of higher privilege");
break;
default:
E_Exit("RET from illegal descriptor type %X",desc.Type());
}
RET_same_level:
Segs.phys[cs]=desc.GetBase();
Segs.big[cs]=desc.Big();
Segs.val[cs]=selector;
reg_eip=offset;
LOG(LOG_CPU,"RET - Same level to %X:%X RPL %X DPL %X",selector,offset,rpl,desc.DPL());
return CPU_CheckState();
} else {
/* Return to higher level */
E_Exit("REturn to higher priviledge");
}
LOG_MSG("Prot ret %X:%X",selector,offset);
return CPU_CheckState();
}
return false;
}
void CPU_SLDT(Bitu & selector) {
selector=cpu.gdt.SLDT();
}
Bitu tr=0;
void CPU_LLDT(Bitu selector) {
cpu.gdt.LLDT(selector);
LOG_MSG("LDT Set to %X",selector);
}
void CPU_STR(Bitu & selector) {
selector=tr;
}
void CPU_LTR(Bitu selector) {
tr=selector;
LOG_MSG("TR Set to %X",selector);
}
void CPU_LGDT(Bitu limit,Bitu base) {
LOG_MSG("GDT Set to base:%X limit:%X",base,limit);
cpu.gdt.SetLimit(limit);
cpu.gdt.SetBase(base);
}
void CPU_LIDT(Bitu limit,Bitu base) {
LOG_MSG("IDT Set to base:%X limit:%X",base,limit);
cpu.idt.SetLimit(limit);
cpu.idt.SetBase(base);
}
void CPU_SGDT(Bitu & limit,Bitu & base) {
limit=cpu.gdt.GetLimit();
base=cpu.gdt.GetBase();
}
void CPU_SIDT(Bitu & limit,Bitu & base) {
limit=cpu.idt.GetLimit();
base=cpu.idt.GetBase();
}
bool CPU_SET_CRX(Bitu cr,Bitu value) {
switch (cr) {
case 0:
{
Bitu changed=cpu.cr0 ^ value;
if (!changed) return true;
cpu.cr0=value;
if (value & CR0_PAGING) LOG_MSG("Paging enabled");
if (value & CR0_PROTECTION) {
LOG_MSG("Protected mode");
} else {
LOG_MSG("Real mode");
}
return CPU_CheckState();
}
default:
LOG(LOG_CPU|LOG_ERROR,"Unhandled MOV CR%d,%X",cr,value);
break;
}
return false;
}
Bitu CPU_GET_CRX(Bitu cr) {
switch (cr) {
case 0:
return cpu.cr0;
default:
LOG(LOG_CPU|LOG_ERROR,"Unhandled MOV XXX, CR%d",cr);
break;
}
return 0;
}
void CPU_SMSW(Bitu & word) {
word=cpu.cr0 & 0xffff;
}
bool CPU_LMSW(Bitu word) {
word&=0xffff;
word|=(cpu.cr0&0xffff0000);
return CPU_SET_CRX(0,word);
}
void CPU_ARPL(Bitu & dest_sel,Bitu src_sel) {
flags.type=t_UNKNOWN;
if ((dest_sel & 3) < (src_sel & 3)) {
dest_sel=(dest_sel & 0xfffc) + (src_sel & 3);
// dest_sel|=0xff3f0000;
SETFLAGBIT(ZF,true);
} else {
SETFLAGBIT(ZF,false);
}
}
void CPU_LAR(Bitu selector,Bitu & ar) {
Descriptor desc;Bitu rpl=selector & 3;
flags.type=t_UNKNOWN;
if (!cpu.gdt.GetDescriptor(selector,desc)){
SETFLAGBIT(ZF,false);
return;
}
if (!desc.saved.seg.p) {
SETFLAGBIT(ZF,false);
return;
}
switch (desc.Type()){
case DESC_CODE_N_C_A: case DESC_CODE_N_C_NA:
case DESC_CODE_R_C_A: case DESC_CODE_R_C_NA:
break;
case DESC_LDT:
case DESC_TASK_GATE:
case DESC_286_TSS_A: case DESC_286_TSS_B:
case DESC_286_INT_GATE: case DESC_286_TRAP_GATE:
case DESC_286_CALL_GATE:
case DESC_386_TSS_A: case DESC_386_TSS_B:
case DESC_386_INT_GATE: case DESC_386_TRAP_GATE:
case DESC_386_CALL_GATE:
case DESC_DATA_EU_RO_NA: case DESC_DATA_EU_RO_A:
case DESC_DATA_EU_RW_NA: case DESC_DATA_EU_RW_A:
case DESC_DATA_ED_RO_NA: case DESC_DATA_ED_RO_A:
case DESC_DATA_ED_RW_NA: case DESC_DATA_ED_RW_A:
case DESC_CODE_N_NC_A: case DESC_CODE_N_NC_NA:
case DESC_CODE_R_NC_A: case DESC_CODE_R_NC_NA:
if (desc.DPL()<cpu.cpl || desc.DPL() < rpl) {
SETFLAGBIT(ZF,false);
return;
}
break;
default:
SETFLAGBIT(ZF,false);
return;
}
/* Valid descriptor */
ar=desc.saved.fill[1] & 0x00ffff00;
SETFLAGBIT(ZF,true);
}
void CPU_LSL(Bitu selector,Bitu & limit) {
Descriptor desc;Bitu rpl=selector & 3;
flags.type=t_UNKNOWN;
if (!cpu.gdt.GetDescriptor(selector,desc)){
SETFLAGBIT(ZF,false);
return;
}
if (!desc.saved.seg.p) {
SETFLAGBIT(ZF,false);
return;
}
switch (desc.Type()){
case DESC_CODE_N_C_A: case DESC_CODE_N_C_NA:
case DESC_CODE_R_C_A: case DESC_CODE_R_C_NA:
break;
case DESC_LDT:
case DESC_286_TSS_A:
case DESC_286_TSS_B:
case DESC_386_TSS_A:
case DESC_386_TSS_B:
case DESC_DATA_EU_RO_NA: case DESC_DATA_EU_RO_A:
case DESC_DATA_EU_RW_NA: case DESC_DATA_EU_RW_A:
case DESC_DATA_ED_RO_NA: case DESC_DATA_ED_RO_A:
case DESC_DATA_ED_RW_NA: case DESC_DATA_ED_RW_A:
case DESC_CODE_N_NC_A: case DESC_CODE_N_NC_NA:
case DESC_CODE_R_NC_A: case DESC_CODE_R_NC_NA:
if (desc.DPL()<cpu.cpl || desc.DPL() < rpl) {
SETFLAGBIT(ZF,false);
return;
}
break;
default:
SETFLAGBIT(ZF,false);
return;
}
cpu.gdt.GetDescriptor(selector,desc);
limit=desc.GetLimit();
SETFLAGBIT(ZF,true);
}
bool CPU_SetSegGeneral(SegNames seg,Bitu value) {
Segs.val[seg]=value;
if (cpu.state & STATE_PROTECTED) {
Descriptor desc;
cpu.gdt.GetDescriptor(value,desc);
Segs.phys[seg]=desc.GetBase();
// LOG_MSG("Segment %d Set with base %X limit %X",seg,desc.GetBase(),desc.GetLimit());
if (seg==ss) {
Segs.big[ss]=desc.Big();
return CPU_CheckState();
} else return true;
} else {
Segs.phys[seg]=value << 4;
return true;
}
return false;
}
void CPU_CPUID(void) {
switch (reg_eax) {
case 0: /* Vendor ID String and maximum level? */
reg_eax=0;
reg_ebx=('G'<< 24) || ('e' << 16) || ('n' << 8) || 'u';
reg_edx=('i'<< 24) || ('n' << 16) || ('e' << 8) || 'T';
reg_ecx=('n'<< 24) || ('t' << 16) || ('e' << 8) || 'l';
break;
case 1: /* get processor type/family/model/stepping and feature flags */
reg_eax=0x402; /* intel 486 sx? */
reg_ebx=0; /* Not Supported */
reg_ecx=0; /* No features */
reg_edx=0; /* Nothing either */
break;
default:
LOG(LOG_CPU|LOG_ERROR,"Unhandled CPUID Function %x",reg_eax);
break;
}
}
void CPU_Real_16_Slow_Start(void);
void CPU_Core_Full_Start(void);
void SetCPU16bit()
{
cpu.state=0;
cpu.cr0=false;
CPU_Real_16_Slow_Start();
// CPU_Core_Full_Start();
}
static void CPU_CycleIncrease(void) {
Bitu old_cycles=CPU_CycleMax;
CPU_CycleMax=(Bitu)(CPU_CycleMax*1.2);
CPU_CycleLeft=0;CPU_Cycles=0;
if (CPU_CycleMax==old_cycles) CPU_CycleMax++;
LOG_MSG("CPU:%d cycles",CPU_CycleMax);
}
static void CPU_CycleDecrease(void) {
CPU_CycleMax=(Bitu)(CPU_CycleMax/1.2);
CPU_CycleLeft=0;CPU_Cycles=0;
if (!CPU_CycleMax) CPU_CycleMax=1;
LOG_MSG("CPU:%d cycles",CPU_CycleMax);
}
void CPU_Init(Section* sec) {
Section_prop * section=static_cast<Section_prop *>(sec);
reg_eax=0;
reg_ebx=0;
reg_ecx=0;
reg_edx=0;
reg_edi=0;
reg_esi=0;
reg_ebp=0;
reg_esp=0;
SegSet16(cs,0);
SegSet16(ds,0);
SegSet16(es,0);
SegSet16(fs,0);
SegSet16(gs,0);
SegSet16(ss,0);
reg_eip=0;
flags.word=FLAG_IF;
flags.type=t_UNKNOWN;
cpu.full.entry=cpu.full.prefix=0;
SetCPU16bit();
KEYBOARD_AddEvent(KBD_f11,KBD_MOD_CTRL,CPU_CycleDecrease);
KEYBOARD_AddEvent(KBD_f12,KBD_MOD_CTRL,CPU_CycleIncrease);
CPU_Cycles=0;
CPU_CycleMax=section->Get_int("cycles");;
if (!CPU_CycleMax) CPU_CycleMax=1500;
CPU_CycleLeft=0;
MSG_Add("CPU_CONFIGFILE_HELP","The amount of cycles to execute each loop. Lowering this setting will slowdown dosbox\n");
}
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