source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/IDE_8bit.inc @ 491

; Project name  :   XTIDE Universal BIOS
; Description   :   Macros for accessing data port(s) on 8-bit
;                   IDE controllers.

;
; XTIDE Universal BIOS and Associated Tools
; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; GNU General Public License for more details.
; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
;

%ifndef IDE_8BIT_INC
%define IDE_8BIT_INC

;--------------------------------------------------------------------
; UNROLL_SECTORS_IN_CX_TO_DWORDS
; UNROLL_SECTORS_IN_CX_TO_QWORDS
; UNROLL_SECTORS_IN_CX_TO_OWORDS
;   Parameters:
;       CX:     Number of sectors in block
;   Returns:
;       CX:     Number of DWORDs, QWORDs or OWORDs in block
;   Corrupts registers:
;       Nothing
;--------------------------------------------------------------------
%macro UNROLL_SECTORS_IN_CX_TO_DWORDS 0
%ifdef USE_186
    shl     cx, 7
%else
    xchg    cl, ch      ; Sectors to WORDs (SHL CX, 8)
    shr     cx, 1
%endif
%endmacro

%macro UNROLL_SECTORS_IN_CX_TO_QWORDS 0
%ifdef USE_186
    shl     cx, 6
%else
    UNROLL_SECTORS_IN_CX_TO_DWORDS
    shr     cx, 1
%endif
%endmacro

%macro UNROLL_SECTORS_IN_CX_TO_OWORDS 0
%ifdef USE_186
    shl     cx, 5
%else
;   UNROLL_SECTORS_IN_CX_TO_QWORDS
;   shr     cx, 1
    mov     ch, cl      ; 2 bytes shorter but possibly slower
    mov     cl, 3
    shr     cx, cl
%endif
%endmacro


;--------------------------------------------------------------------
; Emulates INSW for XTIDE.
;
; XTIDE_INSW
;   Parameters:
;       BL:     Bit mask for toggling XTIDE data low/high reg
;       DX:     XTIDE Data Low Register address
;       ES:DI:  Ptr to destination buffer
;   Returns:
;       ES:DI:  Incremented/decremented for next word
;   Corrupts registers:
;       AL, FLAGS
;--------------------------------------------------------------------
%macro XTIDE_INSW 0
%ifdef USE_186  ; INS instruction available
    insb                        ; Load low byte from port DX to [ES:DI]
    xor     dl, bl              ; IDE Data Reg to XTIDE Data High Reg
    insb                        ; Load high byte from port DX to [ES:DI]
    xor     dl, bl              ; Restore to IDE Data Register
%else   ; If 8088/8086
    in      al, dx              ; Load low byte from port
    xor     dl, bl              ; IDE Data Reg to XTIDE Data High Reg
    stosb                       ; Store byte to [ES:DI]
    in      al, dx              ; Load high byte from port
    xor     dl, bl              ; Restore to IDE Data Register
    stosb                       ; Store byte to [ES:DI]
%endif
%endmacro


;--------------------------------------------------------------------
; Emulates OUTSW for XTIDE.
;
; XTIDE_OUTSW
;   Parameters:
;       BL:     Bit mask for toggling XTIDE data low/high reg
;       DX:     XTIDE Data Low Register address
;       DS:SI:  Ptr to source buffer
;   Returns:
;       SI:     Incremented/decremented for next word
;   Corrupts registers:
;       AX, FLAGS
;--------------------------------------------------------------------
%macro XTIDE_OUTSW 0
%ifdef USE_186  ; OUTS instruction available
    lodsb                       ; Load low byte from [DS:SI] to AL
    xor     dl, bl              ; IDE Data Reg to XTIDE Data High Reg
    outsb                       ; Output high byte from [DS:SI]
    xor     dl, bl              ; XTIDE Data High Reg to Data Low Reg
    out     dx, al              ; Output low byte from AL
%else   ; If 8088/8086
    lodsw                       ; Load word from [DS:SI]
    xor     dl, bl              ; IDE Data Reg to XTIDE Data High Reg
    xchg    al, ah              ; => AL=high byte, AH=low byte
    out     dx, al              ; Output high byte
    xor     dl, bl              ; XTIDE Data High Reg to Data Low Reg
    mov     al, ah              ; Copy low byte to AL
    out     dx, al              ; Output low byte
%endif
%endmacro


;--------------------------------------------------------------------
; Emulates OUTSW for modified XTIDE.
;
; XTIDE_MOD_OUTSW
;   Parameters:
;       DX:     XTIDE Data Low Register address
;       DS:SI:  Ptr to source buffer
;   Returns:
;       SI:     Incremented/decremented for next word
;   Corrupts registers:
;       AX, FLAGS
;--------------------------------------------------------------------
%macro XTIDE_MOD_OUTSW 0
%ifdef USE_186  ; OUTS instruction available
    lodsb                       ; Load low byte from [DS:SI] to AL
    inc     dx                  ; IDE Data Reg to XTIDE MOD Data High Reg
    outsb                       ; Output high byte from [DS:SI]
    dec     dx                  ; XTIDE Data High Reg to Data Low Reg
    out     dx, al              ; Output low byte from AL
%else   ; If 8088/8086
    lodsw                       ; Load word from [DS:SI]
    inc     dx                  ; IDE Data Reg to XTIDE MOD Data High Reg
    xchg    al, ah              ; => AL=high byte, AH=low byte
    out     dx, al              ; Output high byte
    dec     dx                  ; XTIDE Data High Reg to Data Low Reg
    mov     al, ah              ; Copy low byte to AL
    out     dx, al              ; Output low byte
%endif
%endmacro


%endif ; IDE_8BIT_INC