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raise privilege level for cpu-internal supervisor level memory accesses

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3051
This commit is contained in:
Sebastian Strohhäcker 2007-11-26 00:00:58 +00:00
parent cb37216a20
commit ee3ead7b27
3 changed files with 57 additions and 29 deletions
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15
include/cpu.h
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@ -150,6 +150,7 @@ void CPU_SetFlags(Bitu word,Bitu mask);
#define EXCEPTION_NP 11
#define EXCEPTION_SS 12
#define EXCEPTION_GP 13
#define EXCEPTION_PF 14
#define CR0_PROTECTION 0x00000001
#define CR0_MONITORPROCESSOR 0x00000002
@ -303,16 +304,9 @@ class Descriptor
public:
Descriptor() { saved.fill[0]=saved.fill[1]=0; }
void Load(PhysPt address) {
Bit32u* data = (Bit32u*)&saved;
*data = mem_readd(address);
*(data+1) = mem_readd(address+4);
}
void Save(PhysPt address) {
Bit32u* data = (Bit32u*)&saved;
mem_writed(address,*data);
mem_writed(address+4,*(data+1));
}
void Load(PhysPt address);
void Save(PhysPt address);
PhysPt GetBase (void) {
return (saved.seg.base_24_31<<24) | (saved.seg.base_16_23<<16) | saved.seg.base_0_15;
}
@ -433,6 +427,7 @@ public:
struct CPUBlock {
Bitu cpl; /* Current Privilege */
Bitu mpl;
Bitu cr0;
bool pmode; /* Is Protected mode enabled */
GDTDescriptorTable gdt;