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bcecde14 | 1 | /** @file\r |
2 | This code fills in standard CMOS values and updates the standard CMOS\r | |
3 | checksum. The Legacy16 code or LegacyBiosPlatform.c is responsible for\r | |
4 | non-standard CMOS locations and non-standard checksums.\r | |
5 | \r | |
6 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r | |
7 | \r | |
8 | This program and the accompanying materials\r | |
9 | are licensed and made available under the terms and conditions\r | |
10 | of the BSD License which accompanies this distribution. The\r | |
11 | full text of the license may be found at\r | |
12 | http://opensource.org/licenses/bsd-license.php\r | |
13 | \r | |
14 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
15 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
16 | \r | |
17 | **/\r | |
18 | \r | |
19 | #include "LegacyBiosInterface.h"\r | |
20 | \r | |
21 | /**\r | |
22 | Read CMOS register through index/data port.\r | |
23 | \r | |
24 | @param[in] Index The index of the CMOS register to read.\r | |
25 | \r | |
26 | @return The data value from the CMOS register specified by Index.\r | |
27 | \r | |
28 | **/\r | |
29 | UINT8\r | |
30 | LegacyReadStandardCmos (\r | |
31 | IN UINT8 Index\r | |
32 | )\r | |
33 | {\r | |
34 | IoWrite8 (PORT_70, Index);\r | |
35 | return IoRead8 (PORT_71);\r | |
36 | }\r | |
37 | \r | |
38 | /**\r | |
39 | Write CMOS register through index/data port.\r | |
40 | \r | |
41 | @param[in] Index The index of the CMOS register to write.\r | |
42 | @param[in] Value The value of CMOS register to write.\r | |
43 | \r | |
44 | @return The value written to the CMOS register specified by Index.\r | |
45 | \r | |
46 | **/\r | |
47 | UINT8\r | |
48 | LegacyWriteStandardCmos (\r | |
49 | IN UINT8 Index,\r | |
50 | IN UINT8 Value\r | |
51 | )\r | |
52 | {\r | |
53 | IoWrite8 (PORT_70, Index);\r | |
54 | return IoWrite8 (PORT_71, Value);\r | |
55 | }\r | |
56 | \r | |
57 | /**\r | |
58 | Calculate the new standard CMOS checksum and write it.\r | |
59 | \r | |
60 | @param Private Legacy BIOS Instance data\r | |
61 | \r | |
62 | @retval EFI_SUCCESS Calculate 16-bit checksum successfully\r | |
63 | \r | |
64 | **/\r | |
65 | EFI_STATUS\r | |
66 | LegacyCalculateWriteStandardCmosChecksum (\r | |
67 | VOID\r | |
68 | )\r | |
69 | {\r | |
70 | UINT8 Register;\r | |
71 | UINT16 Checksum;\r | |
72 | \r | |
73 | for (Checksum = 0, Register = 0x10; Register < 0x2e; Register++) {\r | |
74 | Checksum = (UINT16)(Checksum + LegacyReadStandardCmos (Register));\r | |
75 | }\r | |
76 | LegacyWriteStandardCmos (CMOS_2E, (UINT8)(Checksum >> 8));\r | |
77 | LegacyWriteStandardCmos (CMOS_2F, (UINT8)(Checksum & 0xff));\r | |
78 | return EFI_SUCCESS;\r | |
79 | }\r | |
80 | \r | |
81 | \r | |
82 | /**\r | |
83 | Fill in the standard CMOS stuff before Legacy16 load\r | |
84 | \r | |
85 | @param Private Legacy BIOS Instance data\r | |
86 | \r | |
87 | @retval EFI_SUCCESS It should always work.\r | |
88 | \r | |
89 | **/\r | |
90 | EFI_STATUS\r | |
91 | LegacyBiosInitCmos (\r | |
92 | IN LEGACY_BIOS_INSTANCE *Private\r | |
93 | )\r | |
94 | {\r | |
95 | UINT32 Size;\r | |
96 | \r | |
97 | //\r | |
98 | // Clear all errors except RTC lost power\r | |
99 | //\r | |
100 | LegacyWriteStandardCmos (CMOS_0E, (UINT8)(LegacyReadStandardCmos (CMOS_0E) & BIT7));\r | |
101 | \r | |
102 | //\r | |
103 | // Update CMOS locations 15,16,17,18,30,31 and 32\r | |
104 | // CMOS 16,15 = 640Kb = 0x280\r | |
105 | // CMOS 18,17 = 31,30 = 15Mb max in 1Kb increments =0x3C00 max\r | |
106 | // CMOS 32 = 0x20\r | |
107 | //\r | |
108 | LegacyWriteStandardCmos (CMOS_15, 0x80);\r | |
109 | LegacyWriteStandardCmos (CMOS_16, 0x02);\r | |
110 | \r | |
111 | Size = 15 * SIZE_1MB;\r | |
112 | if (Private->IntThunk->EfiToLegacy16InitTable.OsMemoryAbove1Mb < (15 * SIZE_1MB)) {\r | |
113 | Size = Private->IntThunk->EfiToLegacy16InitTable.OsMemoryAbove1Mb >> 10;\r | |
114 | }\r | |
115 | \r | |
116 | LegacyWriteStandardCmos (CMOS_17, (UINT8)(Size & 0xFF));\r | |
117 | LegacyWriteStandardCmos (CMOS_30, (UINT8)(Size & 0xFF));\r | |
118 | LegacyWriteStandardCmos (CMOS_18, (UINT8)(Size >> 8));\r | |
119 | LegacyWriteStandardCmos (CMOS_31, (UINT8)(Size >> 8));\r | |
120 | \r | |
121 | LegacyCalculateWriteStandardCmosChecksum ();\r | |
122 | \r | |
123 | return EFI_SUCCESS;\r | |
124 | }\r |