140 lines
2.0 KiB
NASM
140 lines
2.0 KiB
NASM
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;
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; Copyright (c) Microsoft Corporation
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;
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; Module Name:
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;
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; blioport.asm
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;
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; Abstract:
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;
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; This module implements IO port access routines for the boot loader.
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;
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; Environment:
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;
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; Boot loader.
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;
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;--
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include bl.inc
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.code
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;++
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;
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; UCHAR
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; BlRtlReadPort8(
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; USHORT Port
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; )
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;
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; Routine Description:
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;
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; This function reads from the specified 8-bit port.
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;
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; Arguments:
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;
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; Port - Supplies the port to read from.
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;
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; Return Value:
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;
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; Value read from the port.
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;
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;--
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?BlRtlReadPort8@@YAEG@Z proc
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mov dx, cx
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in al, dx
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ret
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?BlRtlReadPort8@@YAEG@Z endp
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;++
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;
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; ULONG
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; BlRtlReadPort32(
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; USHORT Port
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; )
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;
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; Routine Description:
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;
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; This function reads from the specified 32-bit port.
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;
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; Arguments:
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;
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; Port - Supplies the port to read from.
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;
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; Return Value:
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;
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; Value read from the port.
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;
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;--
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?BlRtlReadPort32@@YAKG@Z proc
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mov dx, cx
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in eax, dx
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ret
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?BlRtlReadPort32@@YAKG@Z endp
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;++
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;
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; VOID
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; BlRtlWritePort8(
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; USHORT Port,
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; UCHAR Value
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; )
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;
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; Routine Description:
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;
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; This function writes to the specified 8-bit port.
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;
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; Arguments:
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;
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; Port - Supplies the port to write to.
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;
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; Value - Supplies the value to write.
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;
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;--
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?BlRtlWritePort8@@YAXGE@Z proc
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mov al, dl
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mov dx, cx
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out dx, al
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ret
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?BlRtlWritePort8@@YAXGE@Z endp
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;++
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;
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; VOID
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; BlRtlWritePort32(
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; USHORT Port,
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; ULONG Value
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; )
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;
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; Routine Description:
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;
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; This function writes to the specified 32-bit port.
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;
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; Arguments:
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;
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; Port - Supplies the port to write to.
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;
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; Value - Supplies the value to write.
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;
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;--
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?BlRtlWritePort32@@YAXGK@Z proc
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mov eax, edx
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mov dx, cx
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out dx, eax
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ret
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?BlRtlWritePort32@@YAXGK@Z endp
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end
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