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Add CR4 register

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This commit is contained in:
Jonathan Campbell 2021-12-29 16:39:30 -08:00
parent 14c0fae9e7
commit 7e1756b8f5
2 changed files with 9 additions and 1 deletions
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1
include/cpu.h
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@ -539,6 +539,7 @@ struct CPUBlock {
Bitu cpl; /* Current Privilege */
Bitu mpl;
Bitu cr0;
Bitu cr4;
bool pmode; /* Is Protected mode enabled */
GDTDescriptorTable gdt;
DescriptorTable idt;

9
src/cpu/cpu.cpp
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@ -2505,6 +2505,9 @@ void CPU_SET_CRX(Bitu cr,Bitu value) {
case 3:
PAGING_SetDirBase(value);
break;
case 4:
cpu.cr4=value;
break;
default:
LOG(LOG_CPU,LOG_ERROR)("Unhandled MOV CR%d,%X",cr,value);
break;
@ -2532,6 +2535,8 @@ Bitu CPU_GET_CRX(Bitu cr) {
return paging.cr2;
case 3:
return PAGING_GetDirBase() & 0xfffff000;
case 4:
return cpu.cr4;
default:
LOG(LOG_CPU,LOG_ERROR)("Unhandled MOV XXX, CR%d",cr);
break;
@ -3342,8 +3347,10 @@ public:
SegSet16(ss,0); Segs.limit[ss] = do_seg_limits ? 0xFFFF : ((PhysPt)(~0UL)); Segs.expanddown[ss] = false;
CPU_SetFlags(FLAG_IF,FMASK_ALL); //Enable interrupts
cpu.cr0=0xffffffff;
cpu.cr0=0x00000000;
cpu.cr4=0xffffffff;
CPU_SET_CRX(0,0); //Initialize
CPU_SET_CRX(4,0);
cpu.code.big=false;
cpu.stack.mask=0xffff;
cpu.stack.notmask=0xffff0000;