\r
Secure Encrypted Virtualization (SEV) library helper function\r
\r
- Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r
+ Copyright (c) 2017 - 2020, AMD Incorporated. All rights reserved.<BR>\r
\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
address of a memory region.\r
@param[in] NumPages The number of pages from start memory\r
region.\r
- @param[in] Flush Flush the caches before clearing the bit\r
- (mostly TRUE except MMIO addresses)\r
\r
@retval RETURN_SUCCESS The attributes were cleared for the\r
memory region.\r
RETURN_STATUS\r
EFIAPI\r
MemEncryptSevClearPageEncMask (\r
- IN PHYSICAL_ADDRESS Cr3BaseAddress,\r
- IN PHYSICAL_ADDRESS BaseAddress,\r
- IN UINTN NumPages,\r
- IN BOOLEAN Flush\r
+ IN PHYSICAL_ADDRESS Cr3BaseAddress,\r
+ IN PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINTN NumPages\r
)\r
{\r
//\r
address of a memory region.\r
@param[in] NumPages The number of pages from start memory\r
region.\r
- @param[in] Flush Flush the caches before setting the bit\r
- (mostly TRUE except MMIO addresses)\r
\r
@retval RETURN_SUCCESS The attributes were set for the memory\r
region.\r
RETURN_STATUS\r
EFIAPI\r
MemEncryptSevSetPageEncMask (\r
- IN PHYSICAL_ADDRESS Cr3BaseAddress,\r
- IN PHYSICAL_ADDRESS BaseAddress,\r
- IN UINTN NumPages,\r
- IN BOOLEAN Flush\r
+ IN PHYSICAL_ADDRESS Cr3BaseAddress,\r
+ IN PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINTN NumPages\r
+ )\r
+{\r
+ //\r
+ // Memory encryption bit is not accessible in 32-bit mode\r
+ //\r
+ return RETURN_UNSUPPORTED;\r
+}\r
+\r
+/**\r
+ Returns the encryption state of the specified virtual address range.\r
+\r
+ @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use\r
+ current CR3)\r
+ @param[in] BaseAddress Base address to check\r
+ @param[in] Length Length of virtual address range\r
+\r
+ @retval MemEncryptSevAddressRangeUnencrypted Address range is mapped\r
+ unencrypted\r
+ @retval MemEncryptSevAddressRangeEncrypted Address range is mapped\r
+ encrypted\r
+ @retval MemEncryptSevAddressRangeMixed Address range is mapped mixed\r
+ @retval MemEncryptSevAddressRangeError Address range is not mapped\r
+**/\r
+MEM_ENCRYPT_SEV_ADDRESS_RANGE_STATE\r
+EFIAPI\r
+MemEncryptSevGetAddressRangeState (\r
+ IN PHYSICAL_ADDRESS Cr3BaseAddress,\r
+ IN PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINTN Length\r
+ )\r
+{\r
+ //\r
+ // Memory is always encrypted in 32-bit mode\r
+ //\r
+ return MemEncryptSevAddressRangeEncrypted;\r
+}\r
+\r
+/**\r
+ This function clears memory encryption bit for the MMIO region specified by\r
+ BaseAddress and NumPages.\r
+\r
+ @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use\r
+ current CR3)\r
+ @param[in] BaseAddress The physical address that is the start\r
+ address of a MMIO region.\r
+ @param[in] NumPages The number of pages from start memory\r
+ region.\r
+\r
+ @retval RETURN_SUCCESS The attributes were cleared for the\r
+ memory region.\r
+ @retval RETURN_INVALID_PARAMETER Number of pages is zero.\r
+ @retval RETURN_UNSUPPORTED Clearing the memory encryption attribute\r
+ is not supported\r
+**/\r
+RETURN_STATUS\r
+EFIAPI\r
+MemEncryptSevClearMmioPageEncMask (\r
+ IN PHYSICAL_ADDRESS Cr3BaseAddress,\r
+ IN PHYSICAL_ADDRESS BaseAddress,\r
+ IN UINTN NumPages\r
)\r
{\r
//\r