valter/dosbox-staging
1
0
Fork 0
Code Releases Activity

Added Descriptor/table classes

Browse source 
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@872
This commit is contained in:
Ulf Wohlers 2003-04-06 10:25:07 +00:00
parent b7040481ab
commit e2e143a846
1 changed files with 64 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

64
include/cpu.h
View file

@ -96,5 +96,69 @@ bool get_PF(void);
#define LoadOF flags.of=get_OF();
// *********************************************************************
// Descriptor
// *********************************************************************
class Descriptor
{
public:
void LoadValues (Bit32u address) {
Bit32u* data = (Bit32u*)&desc;
*data = mem_readd(address);
*(data+1) = mem_readd(address+1);
}
void SaveValues (Bit32u address) {
Bit32u* data = (Bit32u*)&desc;
mem_writed(address,*data);
mem_writed(address+1,*(data+1));
}
Bit32u GetBase (void) { return (desc.base_24_31<<24) | (desc.base_16_23<<16) | desc.base_0_15; };
Bit32u GetLimit (void) {
Bit32u limit = (desc.limit_16_19<<16) | desc.limit_0_15;
if (desc.g) return (limit<<12) | 0xFFF;
return limit;
}
public:
#pragma pack(1)
typedef struct SDescriptor {
Bit32u limit_0_15 :16;
Bit32u base_0_15 :16;
Bit32u base_16_23 :8;
Bit32u type :5;
Bit32u dpl :2;
Bit32u p :1;
Bit32u limit_16_19 :4;
Bit32u avl :1;
Bit32u r :1;
Bit32u d :1;
Bit32u g :1;
Bit32u base_24_31 :8;
} TDescriptor;
#pragma pack()
TDescriptor desc;
};
class DescriptorTable
{
Bit32u GetBase (void) { return baseAddress; };
Bit16u GetLimit (void) { return limit; };
void SetBase (Bit32u base) { baseAddress = base; };
void SetLimit (Bit16u size) { limit = size; };
bool GetDescriptor (Bit16u selector, Descriptor& desc) {
// selector = the plain index
if (selector>=limit>>3) return false;
desc.LoadValues(baseAddress+(selector<<3));
return true;
};
private:
Bit32u baseAddress;
Bit16u limit;
};
#endif