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Commit 9bb40191 authored by Roy Franz's avatar Roy Franz Committed by Matt Fleming
Browse files

efi: Add get_dram_base() helper function 



Add the get_dram_base() function, shared by arm/arm64.

Signed-off-by: default avatarRoy Franz <roy.franz@linaro.org>
Signed-off-by: default avatarLeif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
parent f966ea02

drivers/firmware/efi/efi-stub-helper.c

+30 −0
Original line number Diff line number Diff line
@@ -11,6 +11,10 @@ 
 */

#define EFI_READ_CHUNK_SIZE	(1024 * 1024)



/* error code which can't be mistaken for valid address */

#define EFI_ERROR	(~0UL)





struct file_info {

	efi_file_handle_t *handle;

	u64 size;
@@ -83,6 +87,32 @@ static efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg, 
	return status;

}





static unsigned long __init get_dram_base(efi_system_table_t *sys_table_arg)

{

	efi_status_t status;

	unsigned long map_size;

	unsigned long membase  = EFI_ERROR;

	struct efi_memory_map map;

	efi_memory_desc_t *md;



	status = efi_get_memory_map(sys_table_arg, (efi_memory_desc_t **)&map.map,

				    &map_size, &map.desc_size, NULL, NULL);

	if (status != EFI_SUCCESS)

		return membase;



	map.map_end = map.map + map_size;



	for_each_efi_memory_desc(&map, md)

		if (md->attribute & EFI_MEMORY_WB)

			if (membase > md->phys_addr)

				membase = md->phys_addr;



	efi_call_early(free_pool, map.map);



	return membase;

}



/*

 * Allocate at the highest possible address that is not above 'max'.

 */