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efi: Add get_dram_base() helper function 

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

Signed-off-by: Roy Franz <roy.franz@linaro.org>
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Roy Franz 2014-01-28 10:41:28 -08:00 committed by Matt Fleming
parent f966ea021f
commit 9bb40191e8
1 changed files with 30 additions and 0 deletions
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30
drivers/firmware/efi/efi-stub-helper.c
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@ -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'.
*/