mirror of https://github.com/acidanthera/audk.git
405 lines
10 KiB
C
405 lines
10 KiB
C
/** @file
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I/O Library. This file has compiler specifics for GCC as there is no
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ANSI C standard for doing IO.
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GCC - uses EFIAPI assembler. __asm__ calls GAS. __volatile__ makes sure the
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compiler puts the assembler in this exact location. The complex GNUC
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operations are not optimzed. It would be possible to also write these
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with EFIAPI assembler.
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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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//
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// Include common header file for this module.
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//
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#include "BaseIoLibIntrinsicInternal.h"
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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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return *(volatile UINT8*)Address;
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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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ASSERT ((Address & 1) == 0);
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return *(volatile UINT16*)Address;
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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 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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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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ASSERT ((Address & 3) == 0);
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return *(volatile UINT32*)Address;
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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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ASSERT ((Address & 7) == 0);
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return *(volatile UINT64*)Address;
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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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/**
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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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__inline__
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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 Data;
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__asm__ __volatile__ ("inb %w1,%b0" : "=a" (Data) : "d" ((UINT16)Port));
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return Data;
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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. It equals to the
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input Value instead of the actual value read back from
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the I/O port.
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**/
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__inline__
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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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__asm__ __volatile__ ("outb %b0,%w1" : : "a" (Value), "d" ((UINT16)Port));
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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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__inline__
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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 Data;
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ASSERT ((Port & 1) == 0);
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__asm__ __volatile__ ("inw %w1,%w0" : "=a" (Data) : "d" ((UINT16)Port));
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return Data;
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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 to the I/O port. It equals to the
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input Value instead of the actual value read back from
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the I/O port.
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**/
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__inline__
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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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__asm__ __volatile__ ("outw %w0,%w1" : : "a" (Value), "d" ((UINT16)Port));
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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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__inline__
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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 Data;
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ASSERT ((Port & 3) == 0);
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__asm__ __volatile__ ("inl %w1,%0" : "=a" (Data) : "d" ((UINT16)Port));
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return Data;
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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 to the I/O port. It equals to the
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input Value instead of the actual value read back from
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the I/O port.
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**/
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__inline__
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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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__asm__ __volatile__ ("outl %0,%w1" : : "a" (Value), "d" ((UINT16)Port));
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return Value;
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}
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