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git.proxmox.com Git - mirror_edk2.git/blob - OvmfPkg/QemuVideoDxe/UnalignedIoMsc.c
2 Unaligned port I/O. This file has compiler specifics for Microsoft C as there
3 is no ANSI C standard for doing IO.
7 Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
8 This program and the accompanying materials are licensed and made available
9 under the terms and conditions of the BSD License which accompanies this
10 distribution. The full text of the license may be found at
11 http://opensource.org/licenses/bsd-license.php.
13 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
14 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
19 #include "UnalignedIoInternal.h"
21 unsigned long _inpd (unsigned short port
);
22 unsigned long _outpd (unsigned short port
, unsigned long dataword
);
23 void _ReadWriteBarrier (void);
26 Performs a 32-bit write to the specified, possibly unaligned I/O-type
29 Writes the 32-bit I/O port specified by Port with the value specified by
30 Value and returns Value. This function must guarantee that all I/O read and
31 write operations are serialized.
33 If 32-bit unaligned I/O port operations are not supported, then ASSERT().
35 @param[in] Port I/O port address
36 @param[in] Value 32-bit word to write
38 @return The value written to the I/O port.
48 _outpd ((UINT16
)Port
, Value
);
54 Reads a 32-bit word from the specified, possibly unaligned I/O-type address.
56 Reads the 32-bit I/O port specified by Port. The 32-bit read value is
57 returned. This function must guarantee that all I/O read and write operations
60 If 32-bit unaligned I/O port operations are not supported, then ASSERT().
62 @param[in] Port The I/O port to read.
64 @return The value read.
75 Value
= _inpd ((UINT16
)Port
);