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Allow switching of cpu cores through certain instructions.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1034
This commit is contained in:
Sjoerd van der Berg 2003-06-02 21:18:38 +00:00
parent 81e9ba2cdf
commit 1169165d7f
1 changed files with 29 additions and 13 deletions
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42
src/cpu/cpu.cpp
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@ -40,6 +40,24 @@ Bits CPU_CycleMax=1500;
CPU_Decoder * cpudecoder;
void CPU_Real_16_Slow_Start(void);
void CPU_Core_Full_Start(void);
typedef void DecoderStart(void);
//Determine correct core, to start from cpu state.
DecoderStart * CPU_DecorderStarts[8]={
CPU_Real_16_Slow_Start, //16-bit real,16-bit stack
// CPU_Core_Full_Start, //16-bit prot,16-bit stack
CPU_Core_Full_Start, //16-bit prot,16-bit stack
0, //32-bit real,16-bit stack ILLEGAL
CPU_Core_Full_Start, //32-bit prot,16-bit stack
0, //16-bit real,32-bit stack ILLEGAL
CPU_Core_Full_Start, //16-bit prot,32-bit stack
0, //32-bit real,32-bit stack ILLEGAL
CPU_Core_Full_Start, //32-bit prot,32-bit stack
};
INLINE void CPU_Push16(Bitu value) {
if (cpu.state & STATE_STACK32) {
reg_esp-=2;
@ -95,10 +113,10 @@ PhysPt SelBase(Bitu sel) {
}
bool CPU_CheckState(void) {
cpu.state=0;
Bitu old_state=cpu.state;
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]) {
@ -111,8 +129,11 @@ bool CPU_CheckState(void) {
if (Segs.big[ss]) cpu.state|=STATE_STACK32;
LOG_MSG("CPL Level %x at %X:%X",cpu.cpl,SegValue(cs),reg_eip);
}
return true;
if (old_state==cpu.state) return true;
(*CPU_DecorderStarts[cpu.state])();
return false;
}
Bit8u lastint;
bool Interrupt(Bitu num) {
lastint=num;
@ -771,14 +792,6 @@ void CPU_CPUID(void) {
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);
@ -818,8 +831,11 @@ void CPU_Init(Section* sec) {
flags.type=t_UNKNOWN;
cpu.full.entry=cpu.full.prefix=0;
SetCPU16bit();
cpu.state=0xff; //To initialize it the first time
cpu.cr0=false;
CPU_CheckState();
KEYBOARD_AddEvent(KBD_f11,KBD_MOD_CTRL,CPU_CycleDecrease);
KEYBOARD_AddEvent(KBD_f12,KBD_MOD_CTRL,CPU_CycleIncrease);