diff options
Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/UefiPayloadPkg/UefiPayloadEntry/MemoryAllocation.c')
| -rw-r--r-- | src/VBox/Devices/EFI/Firmware/UefiPayloadPkg/UefiPayloadEntry/MemoryAllocation.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/UefiPayloadPkg/UefiPayloadEntry/MemoryAllocation.c b/src/VBox/Devices/EFI/Firmware/UefiPayloadPkg/UefiPayloadEntry/MemoryAllocation.c new file mode 100644 index 00000000..470f81cd --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/UefiPayloadPkg/UefiPayloadEntry/MemoryAllocation.c @@ -0,0 +1,201 @@ +/** @file + + + Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR> + Copyright (c) 2020, Intel Corporation. All rights reserved.<BR> + + SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + +#include "UefiPayloadEntry.h" + +/** + Allocates one or more pages of type EfiBootServicesData. + + Allocates the number of pages of MemoryType and returns a pointer to the + allocated buffer. The buffer returned is aligned on a 4KB boundary. + If Pages is 0, then NULL is returned. + If there is not enough memory availble to satisfy the request, then NULL + is returned. + + @param Pages The number of 4 KB pages to allocate. + @return A pointer to the allocated buffer or NULL if allocation fails. +**/ +VOID * +EFIAPI +AllocatePages ( + IN UINTN Pages + ) +{ + EFI_PEI_HOB_POINTERS Hob; + EFI_PHYSICAL_ADDRESS Offset; + EFI_HOB_HANDOFF_INFO_TABLE *HobTable; + + Hob.Raw = GetHobList (); + HobTable = Hob.HandoffInformationTable; + + if (Pages == 0) { + return NULL; + } + + // Make sure allocation address is page alligned. + Offset = HobTable->EfiFreeMemoryTop & EFI_PAGE_MASK; + if (Offset != 0) { + HobTable->EfiFreeMemoryTop -= Offset; + } + + // + // Check available memory for the allocation + // + if (HobTable->EfiFreeMemoryTop - ((Pages * EFI_PAGE_SIZE) + sizeof (EFI_HOB_MEMORY_ALLOCATION)) < HobTable->EfiFreeMemoryBottom) { + return NULL; + } + + HobTable->EfiFreeMemoryTop -= Pages * EFI_PAGE_SIZE; + BuildMemoryAllocationHob (HobTable->EfiFreeMemoryTop, Pages * EFI_PAGE_SIZE, EfiBootServicesData); + + return (VOID *)(UINTN)HobTable->EfiFreeMemoryTop; +} + +/** + Frees one or more 4KB pages that were previously allocated with one of the page allocation + functions in the Memory Allocation Library. + + Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer. Buffer + must have been allocated on a previous call to the page allocation services of the Memory + Allocation Library. If it is not possible to free allocated pages, then this function will + perform no actions. + + If Buffer was not allocated with a page allocation function in the Memory Allocation Library, + then ASSERT(). + If Pages is zero, then ASSERT(). + + @param Buffer Pointer to the buffer of pages to free. + @param Pages The number of 4 KB pages to free. + +**/ +VOID +EFIAPI +FreePages ( + IN VOID *Buffer, + IN UINTN Pages + ) +{ +} + +/** + Allocates one or more pages of type EfiBootServicesData at a specified alignment. + + Allocates the number of pages specified by Pages of type EfiBootServicesData with an + alignment specified by Alignment. + If Pages is 0, then NULL is returned. + If Alignment is not a power of two and Alignment is not zero, then ASSERT(). + If there is no enough memory at the specified alignment available to satisfy the + request, then NULL is returned. + + @param Pages The number of 4 KB pages to allocate. + @param Alignment The requested alignment of the allocation. + + @return A pointer to the allocated buffer or NULL if allocation fails. +**/ +VOID * +EFIAPI +AllocateAlignedPages ( + IN UINTN Pages, + IN UINTN Alignment + ) +{ + VOID *Memory; + UINTN AlignmentMask; + + // + // Alignment must be a power of two or zero. + // + ASSERT ((Alignment & (Alignment - 1)) == 0); + + if (Pages == 0) { + return NULL; + } + + // + // Check overflow. + // + ASSERT (Pages <= (MAX_ADDRESS - EFI_SIZE_TO_PAGES (Alignment))); + + Memory = (VOID *)(UINTN)AllocatePages (Pages + EFI_SIZE_TO_PAGES (Alignment)); + if (Memory == NULL) { + return NULL; + } + + if (Alignment == 0) { + AlignmentMask = Alignment; + } else { + AlignmentMask = Alignment - 1; + } + + return (VOID *) (UINTN) (((UINTN) Memory + AlignmentMask) & ~AlignmentMask); +} + + +/** + Allocates a buffer of type EfiBootServicesData. + + Allocates the number bytes specified by AllocationSize of type EfiBootServicesData and returns a + pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is + returned. If there is not enough memory remaining to satisfy the request, then NULL is returned. + + @param AllocationSize The number of bytes to allocate. + + @return A pointer to the allocated buffer or NULL if allocation fails. + +**/ +VOID * +EFIAPI +AllocatePool ( + IN UINTN AllocationSize + ) +{ + EFI_HOB_MEMORY_POOL *Hob; + + if (AllocationSize > 0x4000) { + // Please use AllocatePages for big allocations + return NULL; + } + + Hob = (EFI_HOB_MEMORY_POOL *)CreateHob (EFI_HOB_TYPE_MEMORY_POOL, (UINT16)(sizeof (EFI_HOB_TYPE_MEMORY_POOL) + AllocationSize)); + return (VOID *)(Hob + 1); +} + +/** + Allocates and zeros a buffer of type EfiBootServicesData. + + Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, clears the + buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a + valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the + request, then NULL is returned. + + @param AllocationSize The number of bytes to allocate and zero. + + @return A pointer to the allocated buffer or NULL if allocation fails. + +**/ +VOID * +EFIAPI +AllocateZeroPool ( + IN UINTN AllocationSize + ) +{ + VOID *Buffer; + + Buffer = AllocatePool (AllocationSize); + if (Buffer == NULL) { + return NULL; + } + + ZeroMem (Buffer, AllocationSize); + + return Buffer; +} + + |