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38c8be123a
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3246 Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Zhiguang Liu <zhiguang.liu@intel.com> Signed-off-by: Dandan Bi <dandan.bi@intel.com> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn> Acked-by: Ard Biesheuvel <ardb@kernel.org>
266 lines
6.7 KiB
C
266 lines
6.7 KiB
C
/** @file
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I/O Library. This file has compiler specifics for Microsft C as there is no
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ANSI C standard for doing IO.
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MSC - uses intrinsic functions and the optimize will remove the function call
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overhead.
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We don't advocate putting compiler specifics in libraries or drivers but there
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is no other way to make this work.
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Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "BaseIoLibIntrinsicInternal.h"
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//
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// Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
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//
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int _inp (unsigned short port);
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unsigned short _inpw (unsigned short port);
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unsigned long _inpd (unsigned short port);
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int _outp (unsigned short port, int databyte );
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unsigned short _outpw (unsigned short port, unsigned short dataword );
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unsigned long _outpd (unsigned short port, unsigned long dataword );
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void _ReadWriteBarrier (void);
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#pragma intrinsic(_inp)
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#pragma intrinsic(_inpw)
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#pragma intrinsic(_inpd)
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#pragma intrinsic(_outp)
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#pragma intrinsic(_outpw)
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#pragma intrinsic(_outpd)
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#pragma intrinsic(_ReadWriteBarrier)
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//
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// _ReadWriteBarrier() forces memory reads and writes to complete at the point
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// in the call. This is only a hint to the compiler and does emit code.
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// In past versions of the compiler, _ReadWriteBarrier was enforced only
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// locally and did not affect functions up the call tree. In Visual C++
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// 2005, _ReadWriteBarrier is enforced all the way up the call tree.
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//
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/**
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Reads an 8-bit I/O port.
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Reads the 8-bit I/O port specified by Port. The 8-bit read value is returned.
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This function must guarantee that all I/O read and write operations are
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serialized.
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If 8-bit I/O port operations are not supported, then ASSERT().
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@param Port The I/O port to read.
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@return The value read.
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**/
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UINT8
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EFIAPI
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IoRead8 (
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IN UINTN Port
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)
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{
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UINT8 Value;
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BOOLEAN Flag;
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Flag = FilterBeforeIoRead (FilterWidth8, Port, &Value);
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if (Flag) {
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_ReadWriteBarrier ();
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Value = (UINT8)_inp ((UINT16)Port);
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_ReadWriteBarrier ();
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}
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FilterAfterIoRead (FilterWidth8, Port, &Value);
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return Value;
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}
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/**
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Writes an 8-bit I/O port.
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Writes the 8-bit I/O port specified by Port with the value specified by Value
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and returns Value. This function must guarantee that all I/O read and write
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operations are serialized.
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If 8-bit I/O port operations are not supported, then ASSERT().
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@param Port The I/O port to write.
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@param Value The value to write to the I/O port.
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@return The value written to the I/O port.
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**/
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UINT8
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EFIAPI
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IoWrite8 (
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IN UINTN Port,
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IN UINT8 Value
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)
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{
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BOOLEAN Flag;
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Flag = FilterBeforeIoWrite(FilterWidth8, Port, &Value);
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if (Flag) {
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_ReadWriteBarrier ();
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(UINT8)_outp ((UINT16)Port, Value);
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_ReadWriteBarrier ();
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}
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FilterAfterIoWrite (FilterWidth8, Port, &Value);
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return Value;
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}
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/**
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Reads a 16-bit I/O port.
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Reads the 16-bit I/O port specified by Port. The 16-bit read value is returned.
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This function must guarantee that all I/O read and write operations are
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serialized.
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If 16-bit I/O port operations are not supported, then ASSERT().
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If Port is not aligned on a 16-bit boundary, then ASSERT().
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@param Port The I/O port to read.
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@return The value read.
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**/
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UINT16
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EFIAPI
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IoRead16 (
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IN UINTN Port
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)
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{
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UINT16 Value;
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BOOLEAN Flag;
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ASSERT ((Port & 1) == 0);
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Flag = FilterBeforeIoRead (FilterWidth16, Port, &Value);
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if (Flag) {
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_ReadWriteBarrier ();
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Value = _inpw ((UINT16)Port);
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_ReadWriteBarrier ();
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}
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FilterBeforeIoRead (FilterWidth16, Port, &Value);
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return Value;
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}
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/**
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Writes a 16-bit I/O port.
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Writes the 16-bit I/O port specified by Port with the value specified by Value
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and returns Value. This function must guarantee that all I/O read and write
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operations are serialized.
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If 16-bit I/O port operations are not supported, then ASSERT().
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If Port is not aligned on a 16-bit boundary, then ASSERT().
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@param Port The I/O port to write.
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@param Value The value to write to the I/O port.
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@return The value written to the I/O port.
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**/
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UINT16
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EFIAPI
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IoWrite16 (
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IN UINTN Port,
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IN UINT16 Value
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)
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{
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BOOLEAN Flag;
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ASSERT ((Port & 1) == 0);
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Flag = FilterBeforeIoWrite(FilterWidth16, Port, &Value);
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if (Flag) {
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_ReadWriteBarrier ();
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_outpw ((UINT16)Port, Value);
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_ReadWriteBarrier ();
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}
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FilterAfterIoWrite (FilterWidth16, Port, &Value);
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return Value;
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}
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/**
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Reads a 32-bit I/O port.
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Reads the 32-bit I/O port specified by Port. The 32-bit read value is returned.
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This function must guarantee that all I/O read and write operations are
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serialized.
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If 32-bit I/O port operations are not supported, then ASSERT().
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If Port is not aligned on a 32-bit boundary, then ASSERT().
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@param Port The I/O port to read.
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@return The value read.
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**/
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UINT32
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EFIAPI
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IoRead32 (
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IN UINTN Port
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)
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{
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UINT32 Value;
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BOOLEAN Flag;
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ASSERT ((Port & 3) == 0);
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Flag = FilterBeforeIoRead(FilterWidth32, Port, &Value);
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if (Flag) {
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_ReadWriteBarrier ();
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Value = _inpd ((UINT16)Port);
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_ReadWriteBarrier ();
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}
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FilterAfterIoRead (FilterWidth32, Port, &Value);
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return Value;
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}
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/**
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Writes a 32-bit I/O port.
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Writes the 32-bit I/O port specified by Port with the value specified by Value
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and returns Value. This function must guarantee that all I/O read and write
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operations are serialized.
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If 32-bit I/O port operations are not supported, then ASSERT().
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If Port is not aligned on a 32-bit boundary, then ASSERT().
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@param Port The I/O port to write.
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@param Value The value to write to the I/O port.
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@return The value written to the I/O port.
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**/
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UINT32
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EFIAPI
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IoWrite32 (
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IN UINTN Port,
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IN UINT32 Value
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)
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{
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BOOLEAN Flag;
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ASSERT ((Port & 3) == 0);
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Flag = FilterBeforeIoWrite(FilterWidth32, Port, &Value);
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if (Flag) {
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_ReadWriteBarrier ();
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_outpd ((UINT16)Port, Value);
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_ReadWriteBarrier ();
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}
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FilterAfterIoWrite (FilterWidth32, Port, &Value);
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return Value;
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}
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