diff options
Diffstat (limited to 'src/soc/intel/apollolake/memmap.c')
-rw-r--r-- | src/soc/intel/apollolake/memmap.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/memmap.c b/src/soc/intel/apollolake/memmap.c index ea6f447d43..cccbffd40d 100644 --- a/src/soc/intel/apollolake/memmap.c +++ b/src/soc/intel/apollolake/memmap.c @@ -24,6 +24,7 @@ #define __SIMPLE_DEVICE__ #include <arch/io.h> +#include <assert.h> #include <cbmem.h> #include <device/pci.h> #include <soc/northbridge.h> @@ -52,3 +53,34 @@ void smm_region(void **start, size_t *size) *start = (void *)smm_region_start(); *size = smm_region_size(); } + +int smm_subregion(int sub, void **start, size_t *size) +{ + uintptr_t sub_base; + size_t sub_size; + const size_t cache_size = CONFIG_SMM_RESERVED_SIZE; + + sub_base = smm_region_start(); + sub_size = smm_region_size(); + + assert(sub_size > CONFIG_SMM_RESERVED_SIZE); + + switch (sub) { + case SMM_SUBREGION_HANDLER: + /* Handler starts at the base of TSEG. */ + sub_size -= cache_size; + break; + case SMM_SUBREGION_CACHE: + /* External cache is in the middle of TSEG. */ + sub_base += sub_size - cache_size; + sub_size = cache_size; + break; + default: + return -1; + } + + *start = (void *)sub_base; + *size = sub_size; + + return 0; +} |