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Protected mode improvements :

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- LTR now sets TSS state to busy
- LMSW preserves ET bit in CR0
- Fixed PC size in 16-bit system segment on CALL/JMP
Patch from Greatpsycho
This commit is contained in:
OBattler
2017-07-16 21:36:49 +02:00
parent a7eb3c1608
commit c1495ed91d
2 changed files with 15 additions and 6 deletions
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11
src/CPU/x86seg.c
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@@ -628,8 +628,8 @@ void loadcsjmp(uint16_t seg, uint32_t oxpc)
return;
}
type=segdat[2]&0xF00;
if (type==0x400) newpc=segdat[0];
else newpc=segdat[0]|(segdat[3]<<16);
newpc=segdat[0];
if (type&0x800) newpc|=segdat[3]<<16;
switch (type)
{
case 0x400: /*Call gate*/
@@ -737,6 +737,7 @@ void loadcsjmp(uint16_t seg, uint32_t oxpc)
case 0x100: /*286 Task gate*/
case 0x900: /*386 Task gate*/
cpu_state.pc=oxpc;
optype=JMP;
cpl_override=1;
taskswitch286(seg,segdat,segdat[2]&0x800);
flags &= ~NT_FLAG;
@@ -874,8 +875,8 @@ void loadcscall(uint16_t seg)
segdat[2]=readmemw(0,addr+4);
segdat[3]=readmemw(0,addr+6); cpl_override=0; if (cpu_state.abrt) return;
type=segdat[2]&0xF00;
if (type==0x400) newpc=segdat[0];
else newpc=segdat[0]|(segdat[3]<<16);
newpc=segdat[0];
if (type&0x800) newpc|=segdat[3]<<16;
if (csout) pclog("Code seg call - %04X - %04X %04X %04X\n",seg,segdat[0],segdat[1],segdat[2]);
if (segdat[2]&0x1000)
@@ -900,7 +901,7 @@ void loadcscall(uint16_t seg)
}
if (!(segdat[2]&0x8000))
{
x86np("Load CS call not present", seg & 0xfffc);
x86ss("Load CS call not present", seg & 0xfffc);
return;
}
set_use32(segdat[3]&0x40);