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中国DOS联盟论坛 » DOS开发编程 & 发展交流 （开发室） » [Help] How do I access 32-bit I/O ports under DOS?
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Posted 2003-07-29 00:00 · 中国 陕西 西安 电信
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Posted 2003-07-30 00:00 · 新加坡 星和视界(StarHub)宽带
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Under Watcom C there are outpd() and inpd() for reading and writing 32-bit I/O, and under DJGPP there are outpl() and inpl().
Under BC you can:
1. Call the PCI BIOS Extension interrupt of int1A to do 32-bit read/write operations on PCI device registers;
2. Write your own oupd() and inpd() for BC, sample as follows:
static ULONG inpd(int portnum)
{
static ULONG value ;
asm mov dx,portnum ;
asm lea bx,value ;
__emit__(0x66,0x50, // push EAX
0x66,0xED, // in EAX,DX
0x66,0x89,0x07, // mov ,EAX
0x66,0x58) ; // pop EAX
return value ;
}
static void outpd(int portnum, ULONG val)
{
static ULONG value = 0 ;
value = val ;
asm mov dx,portnum ;
asm lea bx,value ;
__emit__(0x66,0x50, // push EAX
0x66,0x8B,0x07, // mov EAX,
0x66,0xEF, // out DX,EAX
0x66,0x58) ; // pop EAX
return ;
}
Under BC you can:
1. Call the PCI BIOS Extension interrupt of int1A to do 32-bit read/write operations on PCI device registers;
2. Write your own oupd() and inpd() for BC, sample as follows:
static ULONG inpd(int portnum)
{
static ULONG value ;
asm mov dx,portnum ;
asm lea bx,value ;
__emit__(0x66,0x50, // push EAX
0x66,0xED, // in EAX,DX
0x66,0x89,0x07, // mov ,EAX
0x66,0x58) ; // pop EAX
return value ;
}
static void outpd(int portnum, ULONG val)
{
static ULONG value = 0 ;
value = val ;
asm mov dx,portnum ;
asm lea bx,value ;
__emit__(0x66,0x50, // push EAX
0x66,0x8B,0x07, // mov EAX,
0x66,0xEF, // out DX,EAX
0x66,0x58) ; // pop EAX
return ;
}
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Posted 2003-08-22 00:00 · 中国 湖南 株洲 电信
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