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efi_loader: carve out efi_get_memory_map_alloc()

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Carve out code from efidebug command used to read the memory map.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Heinrich Schuchardt 2023-01-05 18:26:01 +01:00
parent f4af97cdb4
commit eff4440195
3 changed files with 41 additions and 14 deletions
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16
cmd/efidebug.c
View File

@ -591,25 +591,15 @@ static void print_memory_attributes(u64 attributes)
static int do_efi_show_memmap(struct cmd_tbl *cmdtp, int flag,
int argc, char *const argv[])
{
struct efi_mem_desc *memmap = NULL, *map;
efi_uintn_t map_size = 0;
struct efi_mem_desc *memmap, *map;
efi_uintn_t map_size;
const char *type;
int i;
efi_status_t ret;
ret = efi_get_memory_map(&map_size, memmap, NULL, NULL, NULL);
if (ret == EFI_BUFFER_TOO_SMALL) {
map_size += sizeof(struct efi_mem_desc); /* for my own */
ret = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, map_size,
(void *)&memmap);
ret = efi_get_memory_map_alloc(&map_size, &memmap);
if (ret != EFI_SUCCESS)
return CMD_RET_FAILURE;
ret = efi_get_memory_map(&map_size, memmap, NULL, NULL, NULL);
}
if (ret != EFI_SUCCESS) {
efi_free_pool(memmap);
return CMD_RET_FAILURE;
}
printf("Type Start%.*s End%.*s Attributes\n",
EFI_PHYS_ADDR_WIDTH - 5, spc, EFI_PHYS_ADDR_WIDTH - 3, spc);

3
include/efi_loader.h
View File

@ -736,6 +736,9 @@ efi_status_t efi_allocate_pool(enum efi_memory_type pool_type,
efi_uintn_t size, void **buffer);
/* EFI pool memory free function. */
efi_status_t efi_free_pool(void *buffer);
/* Allocate and retrieve EFI memory map */
efi_status_t efi_get_memory_map_alloc(efi_uintn_t *map_size,
struct efi_mem_desc **memory_map);
/* Returns the EFI memory map */
efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
struct efi_mem_desc *memory_map,

34
lib/efi_loader/efi_memory.c
View File

@ -736,6 +736,40 @@ efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
return EFI_SUCCESS;
}
/**
* efi_get_memory_map_alloc() - allocate map describing memory usage
*
* The caller is responsible for calling FreePool() if the call succeeds.
*
* @memory_map buffer to which the memory map is written
* @map_size size of the memory map
* Return: status code
*/
efi_status_t efi_get_memory_map_alloc(efi_uintn_t *map_size,
struct efi_mem_desc **memory_map)
{
efi_status_t ret;
*memory_map = NULL;
*map_size = 0;
ret = efi_get_memory_map(map_size, *memory_map, NULL, NULL, NULL);
if (ret == EFI_BUFFER_TOO_SMALL) {
*map_size += sizeof(struct efi_mem_desc); /* for the map */
ret = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, *map_size,
(void **)memory_map);
if (ret != EFI_SUCCESS)
return ret;
ret = efi_get_memory_map(map_size, *memory_map,
NULL, NULL, NULL);
if (ret != EFI_SUCCESS) {
efi_free_pool(*memory_map);
*memory_map = NULL;
}
}
return ret;
}
/**
* efi_add_conventional_memory_map() - add a RAM memory area to the map
*