diff options
Diffstat (limited to 'src/soc/intel/skylake')
| -rw-r--r-- | src/soc/intel/skylake/memmap.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/memmap.c b/src/soc/intel/skylake/memmap.c index 81ec89d95d..494b259455 100644 --- a/src/soc/intel/skylake/memmap.c +++ b/src/soc/intel/skylake/memmap.c @@ -61,6 +61,53 @@ void smm_region(void **start, size_t *size) *size = smm_region_size(); } +/* + * Subregions within SMM + * +-------------------------+ BGSM + * | IED | IED_REGION_SIZE + * +-------------------------+ + * | External Stage Cache | SMM_RESERVED_SIZE + * +-------------------------+ + * | code and data | + * | (TSEG) | + * +-------------------------+ TSEG + */ +int smm_subregion(int sub, void **start, size_t *size) +{ + uintptr_t sub_base; + size_t sub_size; + const size_t ied_size = CONFIG_IED_REGION_SIZE; + const size_t cache_size = CONFIG_SMM_RESERVED_SIZE; + + sub_base = smm_region_start(); + sub_size = smm_region_size(); + + switch (sub) { + case SMM_SUBREGION_HANDLER: + /* Handler starts at the base of TSEG. */ + sub_size -= ied_size; + sub_size -= cache_size; + break; + case SMM_SUBREGION_CACHE: + /* External cache is in the middle of TSEG. */ + sub_base += sub_size - (ied_size + cache_size); + sub_size = cache_size; + break; + case SMM_SUBREGION_CHIPSET: + /* IED is at the top. */ + sub_base += sub_size - ied_size; + sub_size = ied_size; + break; + default: + return -1; + } + + *start = (void *)sub_base; + *size = sub_size; + + return 0; +} + void *cbmem_top(void) { /* |