linux/arch/x86/platform/efi/memmap.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Common EFI memory map functions.
 */

#define pr_fmt(fmt) …

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/efi.h>
#include <linux/io.h>
#include <asm/early_ioremap.h>
#include <asm/efi.h>
#include <linux/memblock.h>
#include <linux/slab.h>

static phys_addr_t __init __efi_memmap_alloc_early(unsigned long size)
{ … }

static phys_addr_t __init __efi_memmap_alloc_late(unsigned long size)
{ … }

static
void __init __efi_memmap_free(u64 phys, unsigned long size, unsigned long flags)
{ … }

/**
 * efi_memmap_alloc - Allocate memory for the EFI memory map
 * @num_entries: Number of entries in the allocated map.
 * @data: efi memmap installation parameters
 *
 * Depending on whether mm_init() has already been invoked or not,
 * either memblock or "normal" page allocation is used.
 *
 * Returns zero on success, a negative error code on failure.
 */
int __init efi_memmap_alloc(unsigned int num_entries,
		struct efi_memory_map_data *data)
{ … }

/**
 * efi_memmap_install - Install a new EFI memory map in efi.memmap
 * @data: efi memmap installation parameters
 *
 * Unlike efi_memmap_init_*(), this function does not allow the caller
 * to switch from early to late mappings. It simply uses the existing
 * mapping function and installs the new memmap.
 *
 * Returns zero on success, a negative error code on failure.
 */
int __init efi_memmap_install(struct efi_memory_map_data *data)
{ … }

/**
 * efi_memmap_split_count - Count number of additional EFI memmap entries
 * @md: EFI memory descriptor to split
 * @range: Address range (start, end) to split around
 *
 * Returns the number of additional EFI memmap entries required to
 * accommodate @range.
 */
int __init efi_memmap_split_count(efi_memory_desc_t *md, struct range *range)
{ … }

/**
 * efi_memmap_insert - Insert a memory region in an EFI memmap
 * @old_memmap: The existing EFI memory map structure
 * @buf: Address of buffer to store new map
 * @mem: Memory map entry to insert
 *
 * It is suggested that you call efi_memmap_split_count() first
 * to see how large @buf needs to be.
 */
void __init efi_memmap_insert(struct efi_memory_map *old_memmap, void *buf,
			      struct efi_mem_range *mem)
{ … }