diff options
| author | Roy Franz <roy.franz@linaro.org> | 2014-01-28 10:41:28 -0800 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-06-16 21:34:17 +0100 |
| commit | f2b145dc4ff8efdeb37b10e88b5058d1086b1fe0 (patch) | |
| tree | 067ce83b56fe910ebbed6e960979066dbd75018b | |
| parent | 232eb292bdec928a9a2d440714f7afafe53ce08d (diff) | |
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>
(cherry picked from commit 9bb40191e88d23563fd0467ac195debf5f6daaf9)
Signed-off-by: Mark Brown <broonie@linaro.org>
| -rw-r--r-- | drivers/firmware/efi/efi-stub-helper.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c index 1bf439be9138..a168dd20511f 100644 --- a/drivers/firmware/efi/efi-stub-helper.c +++ b/drivers/firmware/efi/efi-stub-helper.c @@ -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 @@ fail: 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'. */ |