mirror of https://github.com/acidanthera/audk.git
444 lines
11 KiB
C
444 lines
11 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 - 2007, Intel Corporation<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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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 from Port.
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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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_ReadWriteBarrier ();
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Value = (UINT8)_inp ((UINT16)Port);
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_ReadWriteBarrier ();
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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 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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_ReadWriteBarrier ();
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(UINT8)_outp ((UINT16)Port, Value);
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_ReadWriteBarrier ();
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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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@param Port The I/O port to read.
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@return The value read from Port.
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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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ASSERT ((Port & 1) == 0);
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_ReadWriteBarrier ();
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Value = _inpw ((UINT16)Port);
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_ReadWriteBarrier ();
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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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@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 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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ASSERT ((Port & 1) == 0);
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_ReadWriteBarrier ();
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_outpw ((UINT16)Port, Value);
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_ReadWriteBarrier ();
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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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@param Port The I/O port to read.
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@return The value read from Port.
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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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ASSERT ((Port & 3) == 0);
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_ReadWriteBarrier ();
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Value = _inpd ((UINT16)Port);
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_ReadWriteBarrier ();
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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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@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 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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ASSERT ((Port & 3) == 0);
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_ReadWriteBarrier ();
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_outpd ((UINT16)Port, Value);
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_ReadWriteBarrier ();
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return Value;
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}
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/**
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Reads an 8-bit MMIO register.
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Reads the 8-bit MMIO register specified by Address. The 8-bit read value is
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returned. This function must guarantee that all MMIO read and write
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operations are serialized.
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If 8-bit MMIO register operations are not supported, then ASSERT().
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@param Address The MMIO register to read.
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@return The value read from Address.
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**/
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UINT8
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EFIAPI
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MmioRead8 (
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IN UINTN Address
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)
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{
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UINT8 Value;
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Value = *(volatile UINT8*)Address;
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return Value;
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}
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/**
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Writes an 8-bit MMIO register.
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Writes the 8-bit MMIO register specified by Address with the value specified
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by Value and returns Value. This function must guarantee that all MMIO read
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and write operations are serialized.
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If 8-bit MMIO register operations are not supported, then ASSERT().
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@param Address The MMIO register to write.
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@param Value The value to write to the MMIO register.
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@return The value written to the Mmio. It equals to the input
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Value instead of the actual value read back from the
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Mmio.
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**/
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UINT8
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EFIAPI
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MmioWrite8 (
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IN UINTN Address,
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IN UINT8 Value
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)
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{
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return *(volatile UINT8*)Address = Value;
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}
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/**
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Reads a 16-bit MMIO register.
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Reads the 16-bit MMIO register specified by Address. The 16-bit read value is
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returned. This function must guarantee that all MMIO read and write
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operations are serialized.
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If 16-bit MMIO register operations are not supported, then ASSERT().
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@param Address The MMIO register to read.
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@return The value read from Address.
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**/
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UINT16
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EFIAPI
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MmioRead16 (
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IN UINTN Address
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)
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{
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UINT16 Value;
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ASSERT ((Address & 1) == 0);
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Value = *(volatile UINT16*)Address;
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return Value;
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}
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/**
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Writes a 16-bit MMIO register.
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Writes the 16-bit MMIO register specified by Address with the value specified
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by Value and returns Value. This function must guarantee that all MMIO read
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and write operations are serialized.
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If 16-bit MMIO register operations are not supported, then ASSERT().
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@param Address The MMIO register to write.
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@param Value The value to write to the MMIO register.
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@return The value read from the Mmio after wrote specified
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Value.
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**/
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UINT16
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EFIAPI
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MmioWrite16 (
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IN UINTN Address,
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IN UINT16 Value
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)
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{
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ASSERT ((Address & 1) == 0);
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return *(volatile UINT16*)Address = Value;
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}
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/**
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Reads a 32-bit MMIO register.
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Reads the 32-bit MMIO register specified by Address. The 32-bit read value is
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returned. This function must guarantee that all MMIO read and write
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operations are serialized.
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If 32-bit MMIO register operations are not supported, then ASSERT().
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@param Address The MMIO register to read.
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@return The value read from Address.
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**/
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UINT32
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EFIAPI
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MmioRead32 (
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IN UINTN Address
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)
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{
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UINT32 Value;
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ASSERT ((Address & 3) == 0);
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Value = *(volatile UINT32*)Address;
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return Value;
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}
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/**
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Writes a 32-bit MMIO register.
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Writes the 32-bit MMIO register specified by Address with the value specified
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by Value and returns Value. This function must guarantee that all MMIO read
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and write operations are serialized.
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If 32-bit MMIO register operations are not supported, then ASSERT().
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@param Address The MMIO register to write.
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@param Value The value to write to the MMIO register.
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@return The value written to the Mmio. It equals to the input
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Value instead of the actual value read back from the
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Mmio.
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**/
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UINT32
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EFIAPI
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MmioWrite32 (
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IN UINTN Address,
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IN UINT32 Value
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)
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{
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ASSERT ((Address & 3) == 0);
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return *(volatile UINT32*)Address = Value;
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}
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/**
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Reads a 64-bit MMIO register.
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Reads the 64-bit MMIO register specified by Address. The 64-bit read value is
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returned. This function must guarantee that all MMIO read and write
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operations are serialized.
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If 64-bit MMIO register operations are not supported, then ASSERT().
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@param Address The MMIO register to read.
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@return The value read from Address.
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**/
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UINT64
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EFIAPI
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MmioRead64 (
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IN UINTN Address
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)
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{
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UINT64 Value;
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ASSERT ((Address & 7) == 0);
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Value = *(volatile UINT64*)Address;
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return Value;
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}
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/**
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Writes a 64-bit MMIO register.
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Writes the 64-bit MMIO register specified by Address with the value specified
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by Value and returns Value. This function must guarantee that all MMIO read
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and write operations are serialized.
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If 64-bit MMIO register operations are not supported, then ASSERT().
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@param Address The MMIO register to write.
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@param Value The value to write to the MMIO register.
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@return The value written to the Mmio. It equals to the input
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Value instead of the actual value read back from the
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Mmio.
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**/
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UINT64
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EFIAPI
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MmioWrite64 (
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IN UINTN Address,
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IN UINT64 Value
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)
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{
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ASSERT ((Address & 7) == 0);
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return *(volatile UINT64*)Address = Value;
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}
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