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5879b875 | 1 | /** @file\r |
d7132512 LG |
2 | This file declares Read-only Variable Service2 PPI.\r |
3 | This ppi permits read-only access to the UEFI variable store during the PEI phase.\r | |
5879b875 | 4 | \r |
9095d37b | 5 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r |
9344f092 | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
5879b875 | 7 | \r |
5879b875 | 8 | @par Revision Reference:\r |
0047820e | 9 | This PPI is introduced in PI Version 1.0.\r |
5879b875 | 10 | \r |
11 | **/\r | |
12 | \r | |
13 | #ifndef __PEI_READ_ONLY_VARIABLE2_PPI_H__\r | |
14 | #define __PEI_READ_ONLY_VARIABLE2_PPI_H__\r | |
15 | \r | |
16 | #define EFI_PEI_READ_ONLY_VARIABLE2_PPI_GUID \\r | |
00edb218 | 17 | { 0x2ab86ef5, 0xecb5, 0x4134, { 0xb5, 0x56, 0x38, 0x54, 0xca, 0x1f, 0xe1, 0xb4 } }\r |
5879b875 | 18 | \r |
2f88bd3a | 19 | typedef struct _EFI_PEI_READ_ONLY_VARIABLE2_PPI EFI_PEI_READ_ONLY_VARIABLE2_PPI;\r |
5879b875 | 20 | \r |
21 | /**\r | |
d7132512 LG |
22 | This service retrieves a variable's value using its name and GUID.\r |
23 | \r | |
9095d37b LG |
24 | Read the specified variable from the UEFI variable store. If the Data\r |
25 | buffer is too small to hold the contents of the variable,\r | |
00edb218 A |
26 | the error EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the\r |
27 | required buffer size to obtain the data.\r | |
5879b875 | 28 | \r |
13c38031 | 29 | @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.\r |
30 | @param VariableName A pointer to a null-terminated string that is the variable's name.\r | |
255f993d | 31 | @param VariableGuid A pointer to an EFI_GUID that is the variable's GUID. The combination of\r |
13c38031 | 32 | VariableGuid and VariableName must be unique.\r |
33 | @param Attributes If non-NULL, on return, points to the variable's attributes.\r | |
34 | @param DataSize On entry, points to the size in bytes of the Data buffer.\r | |
35 | On return, points to the size of the data returned in Data.\r | |
36 | @param Data Points to the buffer which will hold the returned variable value.\r | |
bca08c48 | 37 | May be NULL with a zero DataSize in order to determine the size of the buffer needed.\r |
5879b875 | 38 | \r |
13c38031 | 39 | @retval EFI_SUCCESS The variable was read successfully.\r |
bca08c48 | 40 | @retval EFI_NOT_FOUND The variable was not found.\r |
9095d37b LG |
41 | @retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the resulting data.\r |
42 | DataSize is updated with the size required for\r | |
00edb218 | 43 | the specified variable.\r |
5879b875 | 44 | @retval EFI_INVALID_PARAMETER VariableName, VariableGuid, DataSize or Data is NULL.\r |
5879b875 | 45 | @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.\r |
46 | \r | |
47 | **/\r | |
48 | typedef\r | |
49 | EFI_STATUS\r | |
50 | (EFIAPI *EFI_PEI_GET_VARIABLE2)(\r | |
00edb218 A |
51 | IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,\r |
52 | IN CONST CHAR16 *VariableName,\r | |
53 | IN CONST EFI_GUID *VariableGuid,\r | |
54 | OUT UINT32 *Attributes,\r | |
55 | IN OUT UINTN *DataSize,\r | |
bca08c48 | 56 | OUT VOID *Data OPTIONAL\r |
ba237732 | 57 | );\r |
5879b875 | 58 | \r |
5879b875 | 59 | /**\r |
d7132512 LG |
60 | Return the next variable name and GUID.\r |
61 | \r | |
9095d37b LG |
62 | This function is called multiple times to retrieve the VariableName\r |
63 | and VariableGuid of all variables currently available in the system.\r | |
64 | On each call, the previous results are passed into the interface,\r | |
65 | and, on return, the interface returns the data for the next\r | |
66 | interface. When the entire variable list has been returned,\r | |
00edb218 | 67 | EFI_NOT_FOUND is returned.\r |
5879b875 | 68 | \r |
00edb218 | 69 | @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.\r |
5879b875 | 70 | \r |
00edb218 | 71 | @param VariableNameSize On entry, points to the size of the buffer pointed to by VariableName.\r |
9eec5948 | 72 | On return, the size of the variable name buffer.\r |
ac644614 | 73 | @param VariableName On entry, a pointer to a null-terminated string that is the variable's name.\r |
74 | On return, points to the next variable's null-terminated name string.\r | |
5879b875 | 75 | \r |
9095d37b | 76 | @param VariableGuid On entry, a pointer to an EFI_GUID that is the variable's GUID.\r |
ac644614 | 77 | On return, a pointer to the next variable's GUID.\r |
5879b875 | 78 | \r |
5879b875 | 79 | @retval EFI_SUCCESS The variable was read successfully.\r |
5879b875 | 80 | @retval EFI_NOT_FOUND The variable could not be found.\r |
5879b875 | 81 | @retval EFI_BUFFER_TOO_SMALL The VariableNameSize is too small for the resulting\r |
00edb218 A |
82 | data. VariableNameSize is updated with the size\r |
83 | required for the specified variable.\r | |
5879b875 | 84 | @retval EFI_INVALID_PARAMETER VariableName, VariableGuid or\r |
00edb218 | 85 | VariableNameSize is NULL.\r |
5879b875 | 86 | @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.\r |
87 | \r | |
88 | **/\r | |
89 | typedef\r | |
90 | EFI_STATUS\r | |
5a9403b8 | 91 | (EFIAPI *EFI_PEI_GET_NEXT_VARIABLE_NAME2)(\r |
00edb218 A |
92 | IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,\r |
93 | IN OUT UINTN *VariableNameSize,\r | |
94 | IN OUT CHAR16 *VariableName,\r | |
95 | IN OUT EFI_GUID *VariableGuid\r | |
ba237732 | 96 | );\r |
5879b875 | 97 | \r |
13c38031 | 98 | ///\r |
9095d37b LG |
99 | /// This PPI provides a lightweight, read-only variant of the full EFI\r |
100 | /// variable services.\r | |
13c38031 | 101 | ///\r |
5879b875 | 102 | struct _EFI_PEI_READ_ONLY_VARIABLE2_PPI {\r |
2f88bd3a MK |
103 | EFI_PEI_GET_VARIABLE2 GetVariable;\r |
104 | EFI_PEI_GET_NEXT_VARIABLE_NAME2 NextVariableName;\r | |
5879b875 | 105 | };\r |
106 | \r | |
2f88bd3a | 107 | extern EFI_GUID gEfiPeiReadOnlyVariable2PpiGuid;\r |
5879b875 | 108 | \r |
109 | #endif\r |