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Diffstat (limited to 'src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Ppi/ReadOnlyVariable2.h')
| -rw-r--r-- | src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Ppi/ReadOnlyVariable2.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Ppi/ReadOnlyVariable2.h b/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Ppi/ReadOnlyVariable2.h new file mode 100644 index 0000000000..5ff68eecea --- /dev/null +++ b/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Ppi/ReadOnlyVariable2.h @@ -0,0 +1,117 @@ +/** @file + This file declares Read-only Variable Service2 PPI. + This ppi permits read-only access to the UEFI variable store during the PEI phase. + +Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR> +This program and the accompanying materials are licensed and made available under +the terms and conditions of the BSD License that accompanies this distribution. +The full text of the license may be found at +http://opensource.org/licenses/bsd-license.php. + +THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + + @par Revision Reference: + This PPI is introduced in PI Version 1.0. + +**/ + +#ifndef __PEI_READ_ONLY_VARIABLE2_PPI_H__ +#define __PEI_READ_ONLY_VARIABLE2_PPI_H__ + +#define EFI_PEI_READ_ONLY_VARIABLE2_PPI_GUID \ + { 0x2ab86ef5, 0xecb5, 0x4134, { 0xb5, 0x56, 0x38, 0x54, 0xca, 0x1f, 0xe1, 0xb4 } } + + +typedef struct _EFI_PEI_READ_ONLY_VARIABLE2_PPI EFI_PEI_READ_ONLY_VARIABLE2_PPI; + +/** + This service retrieves a variable's value using its name and GUID. + + Read the specified variable from the UEFI variable store. If the Data + buffer is too small to hold the contents of the variable, + the error EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the + required buffer size to obtain the data. + + @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI. + @param VariableName A pointer to a null-terminated string that is the variable's name. + @param VariableGuid A pointer to an EFI_GUID that is the variable's GUID. The combination of + VariableGuid and VariableName must be unique. + @param Attributes If non-NULL, on return, points to the variable's attributes. + @param DataSize On entry, points to the size in bytes of the Data buffer. + On return, points to the size of the data returned in Data. + @param Data Points to the buffer which will hold the returned variable value. + May be NULL with a zero DataSize in order to determine the size of the buffer needed. + + @retval EFI_SUCCESS The variable was read successfully. + @retval EFI_NOT_FOUND The variable was not found. + @retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the resulting data. + DataSize is updated with the size required for + the specified variable. + @retval EFI_INVALID_PARAMETER VariableName, VariableGuid, DataSize or Data is NULL. + @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error. + +**/ +typedef +EFI_STATUS +(EFIAPI *EFI_PEI_GET_VARIABLE2)( + IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This, + IN CONST CHAR16 *VariableName, + IN CONST EFI_GUID *VariableGuid, + OUT UINT32 *Attributes, + IN OUT UINTN *DataSize, + OUT VOID *Data OPTIONAL + ); + + +/** + Return the next variable name and GUID. + + This function is called multiple times to retrieve the VariableName + and VariableGuid of all variables currently available in the system. + On each call, the previous results are passed into the interface, + and, on return, the interface returns the data for the next + interface. When the entire variable list has been returned, + EFI_NOT_FOUND is returned. + + @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI. + + @param VariableNameSize On entry, points to the size of the buffer pointed to by VariableName. + On return, the size of the variable name buffer. + @param VariableName On entry, a pointer to a null-terminated string that is the variable's name. + On return, points to the next variable's null-terminated name string. + + @param VariableGuid On entry, a pointer to an EFI_GUID that is the variable's GUID. + On return, a pointer to the next variable's GUID. + + @retval EFI_SUCCESS The variable was read successfully. + @retval EFI_NOT_FOUND The variable could not be found. + @retval EFI_BUFFER_TOO_SMALL The VariableNameSize is too small for the resulting + data. VariableNameSize is updated with the size + required for the specified variable. + @retval EFI_INVALID_PARAMETER VariableName, VariableGuid or + VariableNameSize is NULL. + @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error. + +**/ +typedef +EFI_STATUS +(EFIAPI *EFI_PEI_GET_NEXT_VARIABLE_NAME2)( + IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This, + IN OUT UINTN *VariableNameSize, + IN OUT CHAR16 *VariableName, + IN OUT EFI_GUID *VariableGuid + ); + +/// +/// This PPI provides a lightweight, read-only variant of the full EFI +/// variable services. +/// +struct _EFI_PEI_READ_ONLY_VARIABLE2_PPI { + EFI_PEI_GET_VARIABLE2 GetVariable; + EFI_PEI_GET_NEXT_VARIABLE_NAME2 NextVariableName; +}; + +extern EFI_GUID gEfiPeiReadOnlyVariable2PpiGuid; + +#endif |