lib/efi_loader/efi_memory.c - filogic/uboot - Gitiles

 /*
  *  EFI application memory management
  *
  *  Copyright (c) 2016 Alexander Graf
  *
  *  SPDX-License-Identifier:     GPL-2.0+
  */

 /* #define DEBUG_EFI */

 #include <common.h>
 #include <efi_loader.h>
 #include <malloc.h>
 #include <asm/global_data.h>
 #include <libfdt_env.h>
 #include <inttypes.h>
 #include <watchdog.h>

 DECLARE_GLOBAL_DATA_PTR;

 struct efi_mem_list {
 	struct list_head link;
 	struct efi_mem_desc desc;
 };

 /* This list contains all memory map items */
 LIST_HEAD(efi_mem);

 /*
  * Unmaps all memory occupied by the carve_desc region from the
  * list entry pointed to by map.
  *
  * Returns 1 if carving was performed or 0 if the regions don't overlap.
  * Returns -1 if it would affect non-RAM regions but overlap_only_ram is set.
  * Carving is only guaranteed to complete when all regions return 0.
  */
 static int efi_mem_carve_out(struct efi_mem_list *map,
 			     struct efi_mem_desc *carve_desc,
 			     bool overlap_only_ram)
 {
 	struct efi_mem_list *newmap;
 	struct efi_mem_desc *map_desc = &map->desc;
 	uint64_t map_start = map_desc->physical_start;
 	uint64_t map_end = map_start + (map_desc->num_pages << EFI_PAGE_SHIFT);
 	uint64_t carve_start = carve_desc->physical_start;
 	uint64_t carve_end = carve_start +
 			     (carve_desc->num_pages << EFI_PAGE_SHIFT);

 	/* check whether we're overlapping */
 	if ((carve_end <= map_start) || (carve_start >= map_end))
 		return 0;

 	/* We're overlapping with non-RAM, warn the caller if desired */
 	if (overlap_only_ram && (map_desc->type != EFI_CONVENTIONAL_MEMORY))
 		return -1;

 	/* Sanitize carve_start and carve_end to lie within our bounds */
 	carve_start = max(carve_start, map_start);
 	carve_end = min(carve_end, map_end);

 	/* Carving at the beginning of our map? Just move it! */
 	if (carve_start == map_start) {
 		if (map_end == carve_end) {
 			/* Full overlap, just remove map */
 			list_del(&map->link);
 		}

 		map_desc->physical_start = carve_end;
 		map_desc->num_pages = (map_end - carve_end) >> EFI_PAGE_SHIFT;
 		return 1;
 	}

 	/*
 	 * Overlapping maps, just split the list map at carve_start,
 	 * it will get moved or removed in the next iteration.
 	 *
 	 * [ map_desc |__carve_start__| newmap ]
 	 */

 	/* Create a new map from [ carve_start ... map_end ] */
 	newmap = calloc(1, sizeof(*newmap));
 	newmap->desc = map->desc;
 	newmap->desc.physical_start = carve_start;
 	newmap->desc.num_pages = (map_end - carve_start) >> EFI_PAGE_SHIFT;
         list_add_tail(&newmap->link, &efi_mem);

 	/* Shrink the map to [ map_start ... carve_start ] */
 	map_desc->num_pages = (carve_start - map_start) >> EFI_PAGE_SHIFT;

 	return 1;
 }

 uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
 			    bool overlap_only_ram)
 {
 	struct list_head *lhandle;
 	struct efi_mem_list *newlist;
 	bool do_carving;

 	if (!pages)
 		return start;

 	newlist = calloc(1, sizeof(*newlist));
 	newlist->desc.type = memory_type;
 	newlist->desc.physical_start = start;
 	newlist->desc.virtual_start = start;
 	newlist->desc.num_pages = pages;

 	switch (memory_type) {
 	case EFI_RUNTIME_SERVICES_CODE:
 	case EFI_RUNTIME_SERVICES_DATA:
 		newlist->desc.attribute = (1 << EFI_MEMORY_WB_SHIFT) |
 					  (1ULL << EFI_MEMORY_RUNTIME_SHIFT);
 		break;
 	case EFI_MMAP_IO:
 		newlist->desc.attribute = 1ULL << EFI_MEMORY_RUNTIME_SHIFT;
 		break;
 	default:
 		newlist->desc.attribute = 1 << EFI_MEMORY_WB_SHIFT;
 		break;
 	}

 	/* Add our new map */
 	do {
 		do_carving = false;
 		list_for_each(lhandle, &efi_mem) {
 			struct efi_mem_list *lmem;
 			int r;

 			lmem = list_entry(lhandle, struct efi_mem_list, link);
 			r = efi_mem_carve_out(lmem, &newlist->desc,
 					      overlap_only_ram);
 			if (r < 0) {
 				return 0;
 			} else if (r) {
 				do_carving = true;
 				break;
 			}
 		}
 	} while (do_carving);

 	/* Add our new map */
         list_add_tail(&newlist->link, &efi_mem);

 	return start;
 }

 static uint64_t efi_find_free_memory(uint64_t len, uint64_t max_addr)
 {
 	struct list_head *lhandle;

 	list_for_each(lhandle, &efi_mem) {
 		struct efi_mem_list *lmem = list_entry(lhandle,
 			struct efi_mem_list, link);
 		struct efi_mem_desc *desc = &lmem->desc;
 		uint64_t desc_len = desc->num_pages << EFI_PAGE_SHIFT;
 		uint64_t desc_end = desc->physical_start + desc_len;
 		uint64_t curmax = min(max_addr, desc_end);
 		uint64_t ret = curmax - len;

 		/* We only take memory from free RAM */
 		if (desc->type != EFI_CONVENTIONAL_MEMORY)
 			continue;

 		/* Out of bounds for max_addr */
 		if ((ret + len) > max_addr)
 			continue;

 		/* Out of bounds for upper map limit */
 		if ((ret + len) > desc_end)
 			continue;

 		/* Out of bounds for lower map limit */
 		if (ret < desc->physical_start)
 			continue;

 		/* Return the highest address in this map within bounds */
 		return ret;
 	}

 	return 0;
 }

 efi_status_t efi_allocate_pages(int type, int memory_type,
 				unsigned long pages, uint64_t *memory)
 {
 	u64 len = pages << EFI_PAGE_SHIFT;
 	efi_status_t r = EFI_SUCCESS;
 	uint64_t addr;

 	switch (type) {
 	case 0:
 		/* Any page */
 		addr = efi_find_free_memory(len, gd->ram_top);
 		if (!addr) {
 			r = EFI_NOT_FOUND;
 			break;
 		}
 		break;
 	case 1:
 		/* Max address */
 		addr = efi_find_free_memory(len, *memory);
 		if (!addr) {
 			r = EFI_NOT_FOUND;
 			break;
 		}
 		break;
 	case 2:
 		/* Exact address, reserve it. The addr is already in *memory. */
 		addr = *memory;
 		break;
 	default:
 		/* UEFI doesn't specify other allocation types */
 		r = EFI_INVALID_PARAMETER;
 		break;
 	}

 	if (r == EFI_SUCCESS) {
 		uint64_t ret;

 		/* Reserve that map in our memory maps */
 		ret = efi_add_memory_map(addr, pages, memory_type, true);
 		if (ret == addr) {
 			*memory = addr;
 		} else {
 			/* Map would overlap, bail out */
 			r = EFI_OUT_OF_RESOURCES;
 		}
 	}

 	return r;
 }

 void *efi_alloc(uint64_t len, int memory_type)
 {
 	uint64_t ret = 0;
 	uint64_t pages = (len + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
 	efi_status_t r;

 	r = efi_allocate_pages(0, memory_type, pages, &ret);
 	if (r == EFI_SUCCESS)
 		return (void*)(uintptr_t)ret;

 	return NULL;
 }

 efi_status_t efi_free_pages(uint64_t memory, unsigned long pages)
 {
 	/* We don't free, let's cross our fingers we have plenty RAM */
 	return EFI_SUCCESS;
 }

 efi_status_t efi_get_memory_map(unsigned long *memory_map_size,
 			       struct efi_mem_desc *memory_map,
 			       unsigned long *map_key,
 			       unsigned long *descriptor_size,
 			       uint32_t *descriptor_version)
 {
 	ulong map_size = 0;
 	struct list_head *lhandle;

 	list_for_each(lhandle, &efi_mem)
 		map_size += sizeof(struct efi_mem_desc);

 	*memory_map_size = map_size;

 	if (descriptor_size)
 		*descriptor_size = sizeof(struct efi_mem_desc);

 	if (*memory_map_size < map_size)
 		return EFI_BUFFER_TOO_SMALL;

 	/* Copy list into array */
 	if (memory_map) {
 		list_for_each(lhandle, &efi_mem) {
 			struct efi_mem_list *lmem;

 			lmem = list_entry(lhandle, struct efi_mem_list, link);
 			*memory_map = lmem->desc;
 			memory_map++;
 		}
 	}

 	return EFI_SUCCESS;
 }

 int efi_memory_init(void)
 {
 	uint64_t runtime_start, runtime_end, runtime_pages;
 	uint64_t uboot_start, uboot_pages;
 	uint64_t uboot_stack_size = 16 * 1024 * 1024;
 	int i;

 	/* Add RAM */
 	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 		u64 ram_start = gd->bd->bi_dram[i].start;
 		u64 ram_size = gd->bd->bi_dram[i].size;
 		u64 start = (ram_start + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
 		u64 pages = (ram_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;

 		efi_add_memory_map(start, pages, EFI_CONVENTIONAL_MEMORY,
 				   false);
 	}

 	/* Add U-Boot */
 	uboot_start = (gd->start_addr_sp - uboot_stack_size) & ~EFI_PAGE_MASK;
 	uboot_pages = (gd->ram_top - uboot_start) >> EFI_PAGE_SHIFT;
 	efi_add_memory_map(uboot_start, uboot_pages, EFI_LOADER_DATA, false);

 	/* Add Runtime Services */
 	runtime_start = (ulong)&__efi_runtime_start & ~EFI_PAGE_MASK;
 	runtime_end = (ulong)&__efi_runtime_stop;
 	runtime_end = (runtime_end + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
 	runtime_pages = (runtime_end - runtime_start) >> EFI_PAGE_SHIFT;
 	efi_add_memory_map(runtime_start, runtime_pages,
 			   EFI_RUNTIME_SERVICES_CODE, false);

 	return 0;
 }
	/*
	* EFI application memory management
	*
	* Copyright (c) 2016 Alexander Graf
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	/* #define DEBUG_EFI */

	#include <common.h>
	#include <efi_loader.h>
	#include <malloc.h>
	#include <asm/global_data.h>
	#include <libfdt_env.h>
	#include <inttypes.h>
	#include <watchdog.h>

	DECLARE_GLOBAL_DATA_PTR;

	struct efi_mem_list {
	struct list_head link;
	struct efi_mem_desc desc;
	};

	/* This list contains all memory map items */
	LIST_HEAD(efi_mem);

	/*
	* Unmaps all memory occupied by the carve_desc region from the
	* list entry pointed to by map.
	*
	* Returns 1 if carving was performed or 0 if the regions don't overlap.
	* Returns -1 if it would affect non-RAM regions but overlap_only_ram is set.
	* Carving is only guaranteed to complete when all regions return 0.
	*/
	static int efi_mem_carve_out(struct efi_mem_list *map,
	struct efi_mem_desc *carve_desc,
	bool overlap_only_ram)
	{
	struct efi_mem_list *newmap;
	struct efi_mem_desc *map_desc = &map->desc;
	uint64_t map_start = map_desc->physical_start;
	uint64_t map_end = map_start + (map_desc->num_pages << EFI_PAGE_SHIFT);
	uint64_t carve_start = carve_desc->physical_start;
	uint64_t carve_end = carve_start +
	(carve_desc->num_pages << EFI_PAGE_SHIFT);

	/* check whether we're overlapping */
	if ((carve_end <= map_start) \|\| (carve_start >= map_end))
	return 0;

	/* We're overlapping with non-RAM, warn the caller if desired */
	if (overlap_only_ram && (map_desc->type != EFI_CONVENTIONAL_MEMORY))
	return -1;

	/* Sanitize carve_start and carve_end to lie within our bounds */
	carve_start = max(carve_start, map_start);
	carve_end = min(carve_end, map_end);

	/* Carving at the beginning of our map? Just move it! */
	if (carve_start == map_start) {
	if (map_end == carve_end) {
	/* Full overlap, just remove map */
	list_del(&map->link);
	}

	map_desc->physical_start = carve_end;
	map_desc->num_pages = (map_end - carve_end) >> EFI_PAGE_SHIFT;
	return 1;
	}

	/*
	* Overlapping maps, just split the list map at carve_start,
	* it will get moved or removed in the next iteration.
	*
	* [ map_desc \|__carve_start__\| newmap ]
	*/

	/* Create a new map from [ carve_start ... map_end ] */
	newmap = calloc(1, sizeof(*newmap));
	newmap->desc = map->desc;
	newmap->desc.physical_start = carve_start;
	newmap->desc.num_pages = (map_end - carve_start) >> EFI_PAGE_SHIFT;
	list_add_tail(&newmap->link, &efi_mem);

	/* Shrink the map to [ map_start ... carve_start ] */
	map_desc->num_pages = (carve_start - map_start) >> EFI_PAGE_SHIFT;

	return 1;
	}

	uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
	bool overlap_only_ram)
	{
	struct list_head *lhandle;
	struct efi_mem_list *newlist;
	bool do_carving;

	if (!pages)
	return start;

	newlist = calloc(1, sizeof(*newlist));
	newlist->desc.type = memory_type;
	newlist->desc.physical_start = start;
	newlist->desc.virtual_start = start;
	newlist->desc.num_pages = pages;

	switch (memory_type) {
	case EFI_RUNTIME_SERVICES_CODE:
	case EFI_RUNTIME_SERVICES_DATA:
	newlist->desc.attribute = (1 << EFI_MEMORY_WB_SHIFT) \|
	(1ULL << EFI_MEMORY_RUNTIME_SHIFT);
	break;
	case EFI_MMAP_IO:
	newlist->desc.attribute = 1ULL << EFI_MEMORY_RUNTIME_SHIFT;
	break;
	default:
	newlist->desc.attribute = 1 << EFI_MEMORY_WB_SHIFT;
	break;
	}

	/* Add our new map */
	do {
	do_carving = false;
	list_for_each(lhandle, &efi_mem) {
	struct efi_mem_list *lmem;
	int r;

	lmem = list_entry(lhandle, struct efi_mem_list, link);
	r = efi_mem_carve_out(lmem, &newlist->desc,
	overlap_only_ram);
	if (r < 0) {
	return 0;
	} else if (r) {
	do_carving = true;
	break;
	}
	}
	} while (do_carving);

	/* Add our new map */
	list_add_tail(&newlist->link, &efi_mem);

	return start;
	}

	static uint64_t efi_find_free_memory(uint64_t len, uint64_t max_addr)
	{
	struct list_head *lhandle;

	list_for_each(lhandle, &efi_mem) {
	struct efi_mem_list *lmem = list_entry(lhandle,
	struct efi_mem_list, link);
	struct efi_mem_desc *desc = &lmem->desc;
	uint64_t desc_len = desc->num_pages << EFI_PAGE_SHIFT;
	uint64_t desc_end = desc->physical_start + desc_len;
	uint64_t curmax = min(max_addr, desc_end);
	uint64_t ret = curmax - len;

	/* We only take memory from free RAM */
	if (desc->type != EFI_CONVENTIONAL_MEMORY)
	continue;

	/* Out of bounds for max_addr */
	if ((ret + len) > max_addr)
	continue;

	/* Out of bounds for upper map limit */
	if ((ret + len) > desc_end)
	continue;

	/* Out of bounds for lower map limit */
	if (ret < desc->physical_start)
	continue;

	/* Return the highest address in this map within bounds */
	return ret;
	}

	return 0;
	}

	efi_status_t efi_allocate_pages(int type, int memory_type,
	unsigned long pages, uint64_t *memory)
	{
	u64 len = pages << EFI_PAGE_SHIFT;
	efi_status_t r = EFI_SUCCESS;
	uint64_t addr;

	switch (type) {
	case 0:
	/* Any page */
	addr = efi_find_free_memory(len, gd->ram_top);
	if (!addr) {
	r = EFI_NOT_FOUND;
	break;
	}
	break;
	case 1:
	/* Max address */
	addr = efi_find_free_memory(len, *memory);
	if (!addr) {
	r = EFI_NOT_FOUND;
	break;
	}
	break;
	case 2:
	/* Exact address, reserve it. The addr is already in memory. /
	addr = *memory;
	break;
	default:
	/* UEFI doesn't specify other allocation types */
	r = EFI_INVALID_PARAMETER;
	break;
	}

	if (r == EFI_SUCCESS) {
	uint64_t ret;

	/* Reserve that map in our memory maps */
	ret = efi_add_memory_map(addr, pages, memory_type, true);
	if (ret == addr) {
	*memory = addr;
	} else {
	/* Map would overlap, bail out */
	r = EFI_OUT_OF_RESOURCES;
	}
	}

	return r;
	}

	void *efi_alloc(uint64_t len, int memory_type)
	{
	uint64_t ret = 0;
	uint64_t pages = (len + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
	efi_status_t r;

	r = efi_allocate_pages(0, memory_type, pages, &ret);
	if (r == EFI_SUCCESS)
	return (void*)(uintptr_t)ret;

	return NULL;
	}

	efi_status_t efi_free_pages(uint64_t memory, unsigned long pages)
	{
	/* We don't free, let's cross our fingers we have plenty RAM */
	return EFI_SUCCESS;
	}

	efi_status_t efi_get_memory_map(unsigned long *memory_map_size,
	struct efi_mem_desc *memory_map,
	unsigned long *map_key,
	unsigned long *descriptor_size,
	uint32_t *descriptor_version)
	{
	ulong map_size = 0;
	struct list_head *lhandle;

	list_for_each(lhandle, &efi_mem)
	map_size += sizeof(struct efi_mem_desc);

	*memory_map_size = map_size;

	if (descriptor_size)
	*descriptor_size = sizeof(struct efi_mem_desc);

	if (*memory_map_size < map_size)
	return EFI_BUFFER_TOO_SMALL;

	/* Copy list into array */
	if (memory_map) {
	list_for_each(lhandle, &efi_mem) {
	struct efi_mem_list *lmem;

	lmem = list_entry(lhandle, struct efi_mem_list, link);
	*memory_map = lmem->desc;
	memory_map++;
	}
	}

	return EFI_SUCCESS;
	}

	int efi_memory_init(void)
	{
	uint64_t runtime_start, runtime_end, runtime_pages;
	uint64_t uboot_start, uboot_pages;
	uint64_t uboot_stack_size = 16 * 1024 * 1024;
	int i;

	/* Add RAM */
	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
	u64 ram_start = gd->bd->bi_dram[i].start;
	u64 ram_size = gd->bd->bi_dram[i].size;
	u64 start = (ram_start + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
	u64 pages = (ram_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;

	efi_add_memory_map(start, pages, EFI_CONVENTIONAL_MEMORY,
	false);
	}

	/* Add U-Boot */
	uboot_start = (gd->start_addr_sp - uboot_stack_size) & ~EFI_PAGE_MASK;
	uboot_pages = (gd->ram_top - uboot_start) >> EFI_PAGE_SHIFT;
	efi_add_memory_map(uboot_start, uboot_pages, EFI_LOADER_DATA, false);

	/* Add Runtime Services */
	runtime_start = (ulong)&__efi_runtime_start & ~EFI_PAGE_MASK;
	runtime_end = (ulong)&__efi_runtime_stop;
	runtime_end = (runtime_end + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
	runtime_pages = (runtime_end - runtime_start) >> EFI_PAGE_SHIFT;
	efi_add_memory_map(runtime_start, runtime_pages,
	EFI_RUNTIME_SERVICES_CODE, false);

	return 0;
	}