efi/libstub: Describe memory functions (1d9b1768) · Commits · 戴 / test

drivers/firmware/efi/libstub/mem.c

+34 −2

Original line number	Diff line number	Diff line
		@@ -16,6 +16,15 @@ static inline bool mmap_has_headroom(unsigned long buff_size,
		return slack / desc_size >= EFI_MMAP_NR_SLACK_SLOTS;
		}

		/**
		* efi_get_memory_map() - get memory map
		* @map: on return pointer to memory map
		*
		* Retrieve the UEFI memory map. The allocated memory leaves room for
		* up to EFI_MMAP_NR_SLACK_SLOTS additional memory map entries.
		*
		* Return: status code
		*/
		efi_status_t efi_get_memory_map(struct efi_boot_memmap *map)
		{
		efi_memory_desc_t *m = NULL;
		@@ -109,8 +118,20 @@ efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr,
		}
		return EFI_SUCCESS;
		}
		/*
		* Allocate at the lowest possible address that is not below 'min'.
		/**
		* efi_low_alloc_above() - allocate pages at or above given address
		* @size: size of the memory area to allocate
		* @align: minimum alignment of the allocated memory area. It should
		* a power of two.
		* @addr: on exit the address of the allocated memory
		* @min: minimum address to used for the memory allocation
		*
		* Allocate at the lowest possible address that is not below @min as
		* EFI_LOADER_DATA. The allocated pages are aligned according to @align but at
		* least EFI_ALLOC_ALIGN. The first allocated page will not below the address
		* given by @min.
		*
		* Return: status code
		*/
		efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align,
		unsigned long *addr, unsigned long min)
		@@ -187,6 +208,17 @@ fail:
		return status;
		}

		/**
		* efi_free() - free memory pages
		* @size: size of the memory area to free in bytes
		* @addr: start of the memory area to free (must be EFI_PAGE_SIZE
		* aligned)
		*
		* @size is rounded up to a multiple of EFI_ALLOC_ALIGN which is an
		* architecture specific multiple of EFI_PAGE_SIZE. So this function should
		* only be used to return pages allocated with efi_allocate_pages() or
		* efi_low_alloc_above().
		*/
		void efi_free(unsigned long size, unsigned long addr)
		{
		unsigned long nr_pages;

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