363 lines
6.1 KiB
NASM
363 lines
6.1 KiB
NASM
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title "Misc. Support Routines"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; misca.asm
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;
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; Abstract:
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;
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; Procedures to correctly touch I/O registers.
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;
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; Author:
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;
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; Shie-Lin Tzong (shielint) Dec-23-1991
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;
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; Environment:
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;
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; x86 real mode.
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;
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; Revision History:
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;
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;--
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.386p
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SIZE_OF_INT15_C0_BUFFER equ 10
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_TEXT SEGMENT PARA USE16 PUBLIC 'CODE'
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ASSUME CS: _TEXT, DS:NOTHING, SS:NOTHING
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;++
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;
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; I/O port space read and write functions.
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;
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;--
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;++
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;
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; UCHAR
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; READ_PORT_UCHAR(
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; PUCHAR Port
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; )
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;
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; Arguments:
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; (sp+2) = Port
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;
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; Returns:
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; Value in Port.
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;
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;--
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public _READ_PORT_UCHAR
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_READ_PORT_UCHAR proc
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push bp
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mov bp, sp
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mov dx, [bp+4]
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in al,dx
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pop bp
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ret
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_READ_PORT_UCHAR endp
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;++
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;
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; USHORT
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; READ_PORT_USHORT(
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; PUSHORT Port
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; )
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;
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; Arguments:
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; (sp+2) = Port
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;
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; Returns:
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; Value in Port.
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;
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;--
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public _READ_PORT_USHORT
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_READ_PORT_USHORT proc
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push bp
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mov bp, sp
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mov dx,[bp+4] ; (dx) = Port
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in ax,dx
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pop bp
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ret
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_READ_PORT_USHORT endp
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;++
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;
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; VOID
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; WRITE_PORT_UCHAR(
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; PUCHAR Port,
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; UCHAR Value
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; )
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;
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; Arguments:
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; (sp+2) = Port
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; (sp+4) = Value
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;
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;--
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public _WRITE_PORT_UCHAR
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_WRITE_PORT_UCHAR proc
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push bp
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mov bp, sp
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mov dx,[bp+4] ; (dx) = Port
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mov al,[bp+6] ; (al) = Value
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out dx,al
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pop bp
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ret
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_WRITE_PORT_UCHAR endp
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;++
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;
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; VOID
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; WRITE_PORT_USHORT(
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; PUSHORT Port,
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; USHORT Value
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; )
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;
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; Arguments:
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; (sp+2) = Port
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; (sp+4) = Value
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;
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;--
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public _WRITE_PORT_USHORT
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_WRITE_PORT_USHORT proc
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push bp
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mov bp, sp
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mov dx,[bp+4] ; (dx) = Port
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mov ax,[bp+6] ; (ax) = Value
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out dx,ax
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pop bp
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ret
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_WRITE_PORT_USHORT endp
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;++
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;
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; VOID
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; GetBiosSystemEnvironment(
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; PUCHAR Buffer
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; )
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;
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; Description:
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;
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; This function performs int 15h C0H function to get System
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; Environment supplied by BIOS ROM.
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;
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; Arguments:
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;
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; Buffer - Supplies a pointer to a buffer to receive the BIOS
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; System Environment. Caller must ensure that the buffer
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; is big enough.
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;
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;--
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GbseBuffer equ [bp + 4]
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public _GetBiosSystemEnvironment
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_GetBiosSystemEnvironment proc near
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push bp
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mov bp, sp
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push bx
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push es
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push ds
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push si
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push di
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mov ah, 0c0h
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int 15h
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mov ax, es ; exchange es and ds
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mov cx, ds
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mov ds, ax
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mov es, cx
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mov si, bx ; [ds:si] -> ROM buffer (source)
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mov di, GbseBuffer ; [es:di] -> caller's buffer (destination)
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mov cx, SIZE_OF_INT15_C0_BUFFER
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rep movsb
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pop di
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pop si
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pop ds
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pop es
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pop bx
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mov sp, bp
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pop bp
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ret
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_GetBiosSystemEnvironment endp
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;++
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;
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; BOOLEAN
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; HwRomCompare(
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; ULONG Source,
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; ULONG Destination
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; ULONG Size
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; )
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;
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; Description:
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;
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; This function performs ROM comparison between the Source ROM
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; block and Destination ROM block.
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;
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; Arguments:
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;
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; Source - Supplies the physical address of source ROM block.
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;
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; Destination - Supplies the physical address of destination ROM block.
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;
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; Size - The size of the comparison. Must be <= 64k.
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;
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; Return:
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;
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; 0 - if the contents of Source and destination are the same.
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;
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; != 0 if the contents are different.
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;--
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HfSource equ [bp + 4]
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HfDestination equ [bp + 8]
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HfSize equ [bp + 12]
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public _HwRomCompare
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_HwRomCompare proc near
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push bp
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mov bp, sp
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push esi
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push edi
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push ds
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push es
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cld
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mov ecx, HfSize
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cmp ecx, 10000h
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ja HfNotTheSame
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mov eax, HfSource
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add eax, ecx
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cmp eax, 100000h
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ja short HfNotTheSame
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mov edx, HfDestination
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add edx, ecx
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cmp edx, 100000h
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ja short HfNotTheSame
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mov eax, HfSource
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shr eax, 4
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mov es, ax
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mov edi, HfSource
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and edi, 0fh
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mov eax, HfDestination
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shr eax, 4
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mov ds, ax
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mov esi, HfDestination
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and esi, 0fh
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shr ecx, 2
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repe cmpsd
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jnz short HfNotTheSame
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mov ax, 0
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jmp short HfExit
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HfNotTheSame:
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mov ax, 1
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HfExit:
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pop es
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pop ds
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pop edi
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pop esi
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pop bp
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ret
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_HwRomCompare endp
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;++
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;
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; VOID
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; HwGetKey(
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; VOID
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; )
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;
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; Description:
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;
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; This function waits for a key to be pressed.
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;
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; Arguments:
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; None.
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;
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;--
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public _HwGetKey
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_HwGetkey proc
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mov ax,0100h
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int 16h
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mov ax,0
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jz short Hgk99
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;
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; Now we call BIOS again, this time to get the key from the keyboard buffer
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;
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int 16h
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Hgk99:
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ret
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_HwGetKey endp
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;++
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;
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; VOID
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; HwPushKey(
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; USHORT Key
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; )
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;
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; Description:
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;
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; This function pushes a character and scan code to keyboard
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; type-ahead buffer.
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;
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; Arguments:
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;
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; Key - Supplies the key to be push back.
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; bit 0 - 7 : Character
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; bit 8 - 15: Scan Code
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;
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;--
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public _HwPushKey
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_HwPushkey proc
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mov cx, [esp + 2] ; character and scan code
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mov ah, 05h
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int 16h
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;
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; I don't care if the function call is successful.
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;
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ret
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_HwPushKey endp
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_TEXT ends
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end
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