173 lines
4 KiB
NASM
173 lines
4 KiB
NASM
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title "Cmos Access Routines"
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;++
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;
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; Copyright (c) 1992 NCR Corporation
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;
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; Module Name:
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;
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; mccmos.asm
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;
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; Abstract:
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;
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; Procedures necessary to access CMOS/ECMOS information.
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;
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; Author:
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;
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; David Risner (o-ncrdr) 20 Apr 1992
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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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.xlist
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;include ks386.inc
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;include mac386.inc
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include callconv.inc
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.list
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; extrn _HalpSystemHardwareLock:DWORD
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subttl "HalpGetCmosData"
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_TEXT SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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;++
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;
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; CMOS space read and write functions.
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;
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;--
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CmosAddressPort equ 70H
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CmosDataPort equ 71H
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ECmosAddressLsbPort equ 74H
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ECmosAddressMsbPort equ 75H
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ECmosDataPort equ 76H
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;++
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;
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; ULONG
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; HalpGetCmosData(
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; IN ULONG SourceLocation
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; IN ULONG SourceAddress
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; IN ULONG ReturnBuffer
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; IN PUCHAR ByteCount
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; )
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;
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; This routine reads the requested number of bytes from CMOS/ECMOS and
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; stores the data read into the supplied buffer in system memory. If
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; the requested data amount exceeds the allowable extent of the source
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; location, the return data is truncated.
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;
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; Arguments:
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;
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; SourceLocation : where data is to be read from CMOS or ECMOS
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; 0 - CMOS, 1 - ECMOS
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;
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; SourceAddress : address in CMOS/ECMOS where data is to be read from
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;
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; ReturnBuffer : address in system memory for return data
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;
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; ByteCount : number of bytes to be read
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;
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; Returns:
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;
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; Number of byte actually read.
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;
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;--
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SourceLocation equ 2*4[ebp]
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SourceAddress equ 3*4[ebp]
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ReturnBuffer equ 4*4[ebp]
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ByteCount equ 5*4[ebp]
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cPublicProc _HalpGetCmosData,4
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push ebp
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mov ebp, esp
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push ebx
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push edi
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;
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; NOTE: The spinlock is needed even in the UP case, because
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; the resource is also used in an interrupt handler (profiler).
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; If we own the spinlock in this routine, and we service
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; the profiler interrupt (which will wait for the spinlock forever),
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; then we have a hosed system.
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;
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Hgcd01:
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cli
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; lea eax, _HalpSystemHardwareLock
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; ACQUIRE_SPINLOCK eax, Hgcd90
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xor edx, edx ; initialize return data length
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mov ecx, ByteCount
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or ecx, ecx ; validate requested byte count
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jz HalpGetCmosDataExit ; if no work to do, exit
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mov edx, SourceAddress
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mov edi, ReturnBuffer
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mov eax, SourceLocation ; cmos or extended cmos?
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cmp eax, 1
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je ECmosReadByte
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cmp eax, 0
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jne HalpGetCmosDataExit
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align 4
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CmosReadByte:
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cmp edx, 0ffH ; validate cmos source address
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ja HalpGetCmosDataExit ; if out of range, exit
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mov al, dl
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out CmosAddressPort, al
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in al, CmosDataPort
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mov [edi], al
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inc edx
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inc edi
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dec ecx
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jnz CmosReadByte
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jmp SHORT HalpGetCmosDataExit
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align 4
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ECmosReadByte:
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cmp edx,0ffffH ; validate ecmos source address
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ja HalpGetCmosDataExit ; if out of range, exit
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mov al, dl
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out ECmosAddressLsbPort, al
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mov al, dh
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out ECmosAddressMsbPort, al
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in al, ECmosDataPort
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mov [edi], al
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inc edx
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inc edi
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dec ecx
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jnz ECmosReadByte
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HalpGetCmosDataExit:
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; lea eax, _HalpSystemHardwareLock
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; RELEASE_SPINLOCK eax
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mov eax, edx ; return bytes read
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pop edi
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pop ebx
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pop ebp
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stdRET _HalpGetCmosData
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;Hgcd90:
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; sti
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; SPIN_ON_SPINLOCK eax, <Hgcd01>
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stdENDP _HalpGetCmosData
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_TEXT ends
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end
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