source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/IDE_8bit.inc@ 150

Last change on this file since 150 was 150, checked in by Tomi Tilli, 14 years ago

Changes to XTIDE Universal BIOS:

  • Redesigned Disk Parameter Tables.
  • Code generalizations for supporting non-IDE devices in the future.
File size: 2.3 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Macros for accessing data port(s) on 8-bit
3; IDE controllers.
4%ifndef IDE_8BIT_INC
5%define IDE_8BIT_INC
6
7;--------------------------------------------------------------------
8; Emulates INSW for XTIDE dual (8-bit) data port.
9;
10; eDUAL_BYTE_PORT_INSW
11; Parameters:
12; BX: Bit mask for toggling XTIDE data low/high reg
13; DX: Port address (must be IDE Data Register)
14; ES:DI: Ptr to destination buffer
15; Returns:
16; ES:DI: Incremented/decremented for next word
17; Corrupts registers:
18; AL, FLAGS
19;--------------------------------------------------------------------
20%macro eDUAL_BYTE_PORT_INSW 0
21%ifdef USE_186 ; INS instruction available
22 insb ; Load low byte from port DX to [ES:DI]
23 xor dx, bx ; IDE Data Reg to XTIDE Data High Reg
24 insb ; Load high byte from port DX to [ES:DI]
25 xor dx, bx ; Restore to IDE Data Register
26%else ; If 8088/8086
27 in al, dx ; Load low byte from port
28 xor dx, bx ; IDE Data Reg to XTIDE Data High Reg
29 stosb ; Store byte to [ES:DI]
30 in al, dx ; Load high byte from port
31 xor dx, bx ; Restore to IDE Data Register
32 stosb ; Store byte to [ES:DI]
33%endif
34%endmacro
35
36
37;--------------------------------------------------------------------
38; Emulates OUTSW for XTIDE dual (8-bit) data port.
39;
40; eDUAL_BYTE_PORT_OUTSW
41; Parameters:
42; BX: Bit mask for toggling XTIDE data low/high reg
43; DX: Port address (must be IDE Data Register)
44; DS:SI: Ptr to source buffer
45; Returns:
46; SI: Incremented/decremented for next word
47; Corrupts registers:
48; AX, FLAGS
49;--------------------------------------------------------------------
50%macro eDUAL_BYTE_PORT_OUTSW 0
51%ifdef USE_186 ; OUTS instruction available
52 lodsb ; Load low byte from [DS:SI] to AL
53 xor dx, bx ; IDE Data Reg to XTIDE Data High Reg
54 outsb ; Output high byte from [DS:SI]
55 xor dx, bx ; IDE Data Reg to XTIDE Data Low Reg
56 out dx, al ; Output low byte from AL
57%else ; If 8088/8086
58 lodsw ; Load word from [DS:SI]
59 xor dx, bx ; IDE Data Reg to XTIDE Data High Reg
60 xchg al, ah ; => AL=high byte, AH=low byte
61 out dx, al ; Output high byte
62 xor dx, bx ; XTIDE Data High Reg to IDE Data Reg
63 mov al, ah ; Copy low byte to AL
64 out dx, al ; Output low byte
65%endif
66%endmacro
67
68
69%endif ; IDE_8BIT_INC
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