| 1 | /** @file
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| 2 | Unaligned Port I/O. This file has compiler specifics for GCC as there is no
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| 3 | ANSI C standard for doing IO.
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| 4 |
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| 5 | Based on IoLibGcc.c.
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| 6 |
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| 7 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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| 8 | This program and the accompanying materials are licensed and made available
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| 9 | under the terms and conditions of the BSD License which accompanies this
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| 10 | distribution. The full text of the license may be found at
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| 11 | http://opensource.org/licenses/bsd-license.php.
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| 12 |
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| 13 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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| 14 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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| 15 |
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| 16 | **/
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| 17 |
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| 18 |
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| 19 | #include "UnalignedIoInternal.h"
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| 20 |
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| 21 | /**
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| 22 | Performs a 32-bit write to the specified, possibly unaligned I/O-type
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| 23 | address.
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| 24 |
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| 25 | Writes the 32-bit I/O port specified by Port with the value specified by
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| 26 | Value and returns Value. This function must guarantee that all I/O read and
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| 27 | write operations are serialized.
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| 28 |
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| 29 | If 32-bit unaligned I/O port operations are not supported, then ASSERT().
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| 30 |
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| 31 | @param[in] Port I/O port address
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| 32 | @param[in] Value 32-bit word to write
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| 33 |
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| 34 | @return The value written to the I/O port.
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| 35 |
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| 36 | **/
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| 37 | UINT32
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| 38 | UnalignedIoWrite32 (
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| 39 | IN UINTN Port,
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| 40 | IN UINT32 Value
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| 41 | )
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| 42 | {
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| 43 | __asm__ __volatile__ ( "outl %0, %1" : : "a" (Value), "d" ((UINT16)Port) );
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| 44 | return Value;
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| 45 | }
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| 46 |
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| 47 | /**
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| 48 | Reads a 32-bit word from the specified, possibly unaligned I/O-type address.
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| 49 |
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| 50 | Reads the 32-bit I/O port specified by Port. The 32-bit read value is
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| 51 | returned. This function must guarantee that all I/O read and write operations
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| 52 | are serialized.
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| 53 |
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| 54 | If 32-bit unaligned I/O port operations are not supported, then ASSERT().
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| 55 |
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| 56 | @param[in] Port The I/O port to read.
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| 57 |
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| 58 | @return The value read.
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| 59 |
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| 60 | **/
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| 61 | UINT32
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| 62 | UnalignedIoRead32 (
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| 63 | IN UINTN Port
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| 64 | )
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| 65 | {
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| 66 | UINT32 Data;
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| 67 | __asm__ __volatile__ ( "inl %1, %0" : "=a" (Data) : "d" ((UINT16)Port) );
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| 68 | return Data;
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| 69 | }
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| 70 |
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