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05a53794 PDJ |
1 | /** @file\r |
2 | Unaligned Port I/O. This file has compiler specifics for GCC as there is no\r | |
3 | ANSI C standard for doing IO.\r | |
4 | \r | |
5 | Based on IoLibGcc.c.\r | |
6 | \r | |
7 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r | |
8 | This program and the accompanying materials are licensed and made available\r | |
9 | under the terms and conditions of the BSD License which accompanies this\r | |
10 | distribution. The full text of the license may be found at\r | |
11 | http://opensource.org/licenses/bsd-license.php.\r | |
12 | \r | |
13 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
14 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
15 | \r | |
16 | **/\r | |
17 | \r | |
18 | \r | |
19 | #include "UnalignedIoInternal.h"\r | |
20 | \r | |
21 | /**\r | |
22 | Performs a 32-bit write to the specified, possibly unaligned I/O-type\r | |
23 | address.\r | |
24 | \r | |
25 | Writes the 32-bit I/O port specified by Port with the value specified by\r | |
26 | Value and returns Value. This function must guarantee that all I/O read and\r | |
27 | write operations are serialized.\r | |
28 | \r | |
29 | If 32-bit unaligned I/O port operations are not supported, then ASSERT().\r | |
30 | \r | |
31 | @param[in] Port I/O port address\r | |
32 | @param[in] Value 32-bit word to write\r | |
33 | \r | |
34 | @return The value written to the I/O port.\r | |
35 | \r | |
36 | **/\r | |
37 | UINT32\r | |
38 | UnalignedIoWrite32 (\r | |
39 | IN UINTN Port,\r | |
40 | IN UINT32 Value\r | |
41 | )\r | |
42 | {\r | |
43 | __asm__ __volatile__ ( "outl %0, %1" : : "a" (Value), "d" ((UINT16)Port) );\r | |
44 | return Value;\r | |
45 | }\r | |
46 | \r | |
47 | /**\r | |
48 | Reads a 32-bit word from the specified, possibly unaligned I/O-type address.\r | |
49 | \r | |
50 | Reads the 32-bit I/O port specified by Port. The 32-bit read value is\r | |
51 | returned. This function must guarantee that all I/O read and write operations\r | |
52 | are serialized.\r | |
53 | \r | |
54 | If 32-bit unaligned I/O port operations are not supported, then ASSERT().\r | |
55 | \r | |
56 | @param[in] Port The I/O port to read.\r | |
57 | \r | |
58 | @return The value read.\r | |
59 | \r | |
60 | **/\r | |
61 | UINT32\r | |
62 | UnalignedIoRead32 (\r | |
63 | IN UINTN Port\r | |
64 | )\r | |
65 | {\r | |
66 | UINT32 Data;\r | |
67 | __asm__ __volatile__ ( "inl %1, %0" : "=a" (Data) : "d" ((UINT16)Port) );\r | |
68 | return Data;\r | |
69 | }\r | |
70 | \r |