return 0;\r
}\r
\r
-/**\r
- Set the bit in bitmap table for the given address.\r
-\r
- @param[in] Address The address to set for.\r
-\r
- @return VOID.\r
-**/\r
-VOID\r
-EFIAPI\r
-SetGuardMapBit (\r
- IN EFI_PHYSICAL_ADDRESS Address\r
- )\r
-{\r
- UINT64 *GuardMap;\r
- UINT64 BitMask;\r
-\r
- FindGuardedMemoryMap (Address, TRUE, &GuardMap);\r
- if (GuardMap != NULL) {\r
- BitMask = LShiftU64 (1, GUARDED_HEAP_MAP_ENTRY_BIT_INDEX (Address));\r
- *GuardMap |= BitMask;\r
- }\r
-}\r
-\r
-/**\r
- Clear the bit in bitmap table for the given address.\r
-\r
- @param[in] Address The address to clear for.\r
-\r
- @return VOID.\r
-**/\r
-VOID\r
-EFIAPI\r
-ClearGuardMapBit (\r
- IN EFI_PHYSICAL_ADDRESS Address\r
- )\r
-{\r
- UINT64 *GuardMap;\r
- UINT64 BitMask;\r
-\r
- FindGuardedMemoryMap (Address, TRUE, &GuardMap);\r
- if (GuardMap != NULL) {\r
- BitMask = LShiftU64 (1, GUARDED_HEAP_MAP_ENTRY_BIT_INDEX (Address));\r
- *GuardMap &= ~BitMask;\r
- }\r
-}\r
\r
/**\r
Check to see if the page at the given address is a Guard page or not.\r
return ((BitMap == BIT0) || (BitMap == BIT2) || (BitMap == (BIT2 | BIT0)));\r
}\r
\r
-/**\r
- Check to see if the page at the given address is a head Guard page or not.\r
\r
- @param[in] Address The address to check for.\r
-\r
- @return TRUE The page at Address is a head Guard page.\r
- @return FALSE The page at Address is not a head Guard page.\r
-**/\r
-BOOLEAN\r
-EFIAPI\r
-IsHeadGuard (\r
- IN EFI_PHYSICAL_ADDRESS Address\r
- )\r
-{\r
- return (GetGuardedMemoryBits (Address, 2) == BIT1);\r
-}\r
-\r
-/**\r
- Check to see if the page at the given address is a tail Guard page or not.\r
-\r
- @param[in] Address The address to check for.\r
-\r
- @return TRUE The page at Address is a tail Guard page.\r
- @return FALSE The page at Address is not a tail Guard page.\r
-**/\r
-BOOLEAN\r
-EFIAPI\r
-IsTailGuard (\r
- IN EFI_PHYSICAL_ADDRESS Address\r
- )\r
-{\r
- return (GetGuardedMemoryBits (Address - EFI_PAGE_SIZE, 2) == BIT0);\r
-}\r
\r
/**\r
Check to see if the page at the given address is guarded or not.\r
ClearGuardedMemoryBits(Memory, NumberOfPages);\r
}\r
\r
-/**\r
- Adjust address of free memory according to existing and/or required Guard.\r
-\r
- This function will check if there're existing Guard pages of adjacent\r
- memory blocks, and try to use it as the Guard page of the memory to be\r
- allocated.\r
\r
- @param[in] Start Start address of free memory block.\r
- @param[in] Size Size of free memory block.\r
- @param[in] SizeRequested Size of memory to allocate.\r
-\r
- @return The end address of memory block found.\r
- @return 0 if no enough space for the required size of memory and its Guard.\r
-**/\r
-UINT64\r
-AdjustMemoryS (\r
- IN UINT64 Start,\r
- IN UINT64 Size,\r
- IN UINT64 SizeRequested\r
- )\r
-{\r
- UINT64 Target;\r
-\r
- //\r
- // UEFI spec requires that allocated pool must be 8-byte aligned. If it's\r
- // indicated to put the pool near the Tail Guard, we need extra bytes to\r
- // make sure alignment of the returned pool address.\r
- //\r
- if ((PcdGet8 (PcdHeapGuardPropertyMask) & BIT7) == 0) {\r
- SizeRequested = ALIGN_VALUE(SizeRequested, 8);\r
- }\r
-\r
- Target = Start + Size - SizeRequested;\r
- ASSERT (Target >= Start);\r
- if (Target == 0) {\r
- return 0;\r
- }\r
-\r
- if (!IsGuardPage (Start + Size)) {\r
- // No Guard at tail to share. One more page is needed.\r
- Target -= EFI_PAGES_TO_SIZE (1);\r
- }\r
-\r
- // Out of range?\r
- if (Target < Start) {\r
- return 0;\r
- }\r
-\r
- // At the edge?\r
- if (Target == Start) {\r
- if (!IsGuardPage (Target - EFI_PAGES_TO_SIZE (1))) {\r
- // No enough space for a new head Guard if no Guard at head to share.\r
- return 0;\r
- }\r
- }\r
-\r
- // OK, we have enough pages for memory and its Guards. Return the End of the\r
- // free space.\r
- return Target + SizeRequested - 1;\r
-}\r
\r
/**\r
Adjust the start address and number of pages to free according to Guard.\r
*NumberOfPages = PagesToFree;\r
}\r
\r
-/**\r
- Adjust the base and number of pages to really allocate according to Guard.\r
-\r
- @param[in,out] Memory Base address of free memory.\r
- @param[in,out] NumberOfPages Size of memory to allocate.\r
-\r
- @return VOID.\r
-**/\r
-VOID\r
-AdjustMemoryA (\r
- IN OUT EFI_PHYSICAL_ADDRESS *Memory,\r
- IN OUT UINTN *NumberOfPages\r
- )\r
-{\r
- //\r
- // FindFreePages() has already taken the Guard into account. It's safe to\r
- // adjust the start address and/or number of pages here, to make sure that\r
- // the Guards are also "allocated".\r
- //\r
- if (!IsGuardPage (*Memory + EFI_PAGES_TO_SIZE (*NumberOfPages))) {\r
- // No tail Guard, add one.\r
- *NumberOfPages += 1;\r
- }\r
-\r
- if (!IsGuardPage (*Memory - EFI_PAGE_SIZE)) {\r
- // No head Guard, add one.\r
- *Memory -= EFI_PAGE_SIZE;\r
- *NumberOfPages += 1;\r
- }\r
-}\r
\r
/**\r
Adjust the pool head position to make sure the Guard page is adjavent to\r
projects / mirror_edk2.git / blobdiff