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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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34
lib/efi_loader/efi_memory.c
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@ -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
*