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| author |   Roy Franz <roy.franz@linaro.org> | 2014-01-28 10:41:28 -0800 |
|---|---|---|
| committer |   Matt Fleming <matt.fleming@intel.com> | 2014-04-17 12:28:55 +0100 |
| commit | 9bb40191e88d23563fd0467ac195debf5f6daaf9 (patch) | |
| tree | 2a8bcbe9635013b5f39083ac16959c7757182061 /drivers/firmware | |
| parent | efi: Add shared printk wrapper for consistent prefixing (diff) | |
| download | linux-dev-9bb40191e88d23563fd0467ac195debf5f6daaf9.tar.xz linux-dev-9bb40191e88d23563fd0467ac195debf5f6daaf9.zip | |
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>
Diffstat (limited to 'drivers/firmware')
| -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'. */ |