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Diffstat (limited to 'src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/MmAccess.h')
| -rw-r--r-- | src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/MmAccess.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/MmAccess.h b/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/MmAccess.h new file mode 100644 index 0000000000..eb94bc529b --- /dev/null +++ b/src/vendorcode/intel/edk2/UDK2017/MdePkg/Include/Protocol/MmAccess.h @@ -0,0 +1,133 @@ +/** @file + EFI MM Access Protocol as defined in the PI 1.5 specification. + + This protocol is used to control the visibility of the MMRAM on the platform. + It abstracts the location and characteristics of MMRAM. The expectation is + that the north bridge or memory controller would publish this protocol. + + The principal functionality found in the memory controller includes the following: + - Exposing the MMRAM to all non-MM agents, or the "open" state + - Shrouding the MMRAM to all but the MM agents, or the "closed" state + - Preserving the system integrity, or "locking" the MMRAM, such that the settings cannot be + perturbed by either boot service or runtime agents + + Copyright (c) 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 + which 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. + +**/ + +#ifndef _MM_ACCESS_H_ +#define _MM_ACCESS_H_ + +#define EFI_MM_ACCESS_PROTOCOL_GUID \ + { \ + 0xc2702b74, 0x800c, 0x4131, {0x87, 0x46, 0x8f, 0xb5, 0xb8, 0x9c, 0xe4, 0xac } \ + } + + +typedef struct _EFI_MM_ACCESS_PROTOCOL EFI_MM_ACCESS_PROTOCOL; + +/** + Opens the MMRAM area to be accessible by a boot-service driver. + + This function "opens" MMRAM so that it is visible while not inside of MM. The function should + return EFI_UNSUPPORTED if the hardware does not support hiding of MMRAM. The function + should return EFI_DEVICE_ERROR if the MMRAM configuration is locked. + + @param[in] This The EFI_MM_ACCESS_PROTOCOL instance. + + @retval EFI_SUCCESS The operation was successful. + @retval EFI_UNSUPPORTED The system does not support opening and closing of MMRAM. + @retval EFI_DEVICE_ERROR MMRAM cannot be opened, perhaps because it is locked. +**/ +typedef +EFI_STATUS +(EFIAPI *EFI_MM_OPEN)( + IN EFI_MM_ACCESS_PROTOCOL *This + ); + +/** + Inhibits access to the MMRAM. + + This function "closes" MMRAM so that it is not visible while outside of MM. The function should + return EFI_UNSUPPORTED if the hardware does not support hiding of MMRAM. + + @param[in] This The EFI_MM_ACCESS_PROTOCOL instance. + + @retval EFI_SUCCESS The operation was successful. + @retval EFI_UNSUPPORTED The system does not support opening and closing of MMRAM. + @retval EFI_DEVICE_ERROR MMRAM cannot be closed. +**/ +typedef +EFI_STATUS +(EFIAPI *EFI_MM_CLOSE)( + IN EFI_MM_ACCESS_PROTOCOL *This + ); + +/** + Inhibits access to the MMRAM. + + This function prohibits access to the MMRAM region. This function is usually implemented such + that it is a write-once operation. + + @param[in] This The EFI_MM_ACCESS_PROTOCOL instance. + + @retval EFI_SUCCESS The device was successfully locked. + @retval EFI_UNSUPPORTED The system does not support locking of MMRAM. +**/ +typedef +EFI_STATUS +(EFIAPI *EFI_MM_LOCK)( + IN EFI_MM_ACCESS_PROTOCOL *This + ); + +/** + Queries the memory controller for the possible regions that will support MMRAM. + + @param[in] This The EFI_MM_ACCESS_PROTOCOL instance. + @param[in,out] MmramMapSize A pointer to the size, in bytes, of the MmramMemoryMap buffer. + @param[in,out] MmramMap A pointer to the buffer in which firmware places the current memory map. + + @retval EFI_SUCCESS The chipset supported the given resource. + @retval EFI_BUFFER_TOO_SMALL The MmramMap parameter was too small. The current buffer size + needed to hold the memory map is returned in MmramMapSize. +**/ +typedef +EFI_STATUS +(EFIAPI *EFI_MM_CAPABILITIES)( + IN CONST EFI_MM_ACCESS_PROTOCOL *This, + IN OUT UINTN *MmramMapSize, + IN OUT EFI_MMRAM_DESCRIPTOR *MmramMap + ); + +/// +/// EFI MM Access Protocol is used to control the visibility of the MMRAM on the platform. +/// It abstracts the location and characteristics of MMRAM. The platform should report all +/// MMRAM via EFI_MM_ACCESS_PROTOCOL. The expectation is that the north bridge or memory +/// controller would publish this protocol. +/// +struct _EFI_MM_ACCESS_PROTOCOL { + EFI_MM_OPEN Open; + EFI_MM_CLOSE Close; + EFI_MM_LOCK Lock; + EFI_MM_CAPABILITIES GetCapabilities; + /// + /// Indicates the current state of the MMRAM. Set to TRUE if MMRAM is locked. + /// + BOOLEAN LockState; + /// + /// Indicates the current state of the MMRAM. Set to TRUE if MMRAM is open. + /// + BOOLEAN OpenState; +}; + +extern EFI_GUID gEfiMmAccessProtocolGuid; + +#endif + |