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New segment structure and usage.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@157
This commit is contained in:
Sjoerd van der Berg 2002-08-19 10:51:35 +00:00
parent 26fd35e740
commit 81b2a872fb
1 changed files with 26 additions and 7 deletions
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33
include/regs.h
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@ -36,13 +36,12 @@ struct Flag_Info {
};
struct Segment {
Bit16u value;
bool special; /* Signal for pointing to special memory */
HostPt host; /* The address of start in host memory */
PhysPt phys; /* The phyiscal address start in emulated machine */
Bit16u val;
PhysPt phys; /* The phyiscal address start in emulated machine */
};
enum { cs=0,ds,es,fs,gs,ss};
enum SegNames { cs=0,ds,es,fs,gs,ss};
struct CPU_Regs {
union {
@ -58,10 +57,30 @@ extern Segment Segs[6];
extern Flag_Info flags;
extern CPU_Regs cpu_regs;
void SetSegment_16(Bit32u seg,Bit16u val);
//#define SegPhys(index) Segs[index].phys
//#define SegValue(index) Segs[index].val
INLINE PhysPt SegPhys(SegNames index) {
return Segs[index].phys;
}
INLINE Bit16u SegValue(SegNames index) {
return Segs[index].val;
}
INLINE RealPt RealMakeSeg(SegNames index,Bit16u off) {
return RealMake(SegValue(index),off);
}
INLINE void SegSet16(Bitu index,Bit16u val) {
Segs[index].val=val;
Segs[index].phys=val << 4;
}
//extern Bit8u & reg_al=cpu_regs.ax.b.l;
enum REG_NUM {
REG_NUM_AX, REG_NUM_CX, REG_NUM_DX, REG_NUM_BX,
REG_NUM_SP, REG_NUM_BP, REG_NUM_SI, REG_NUM_DI