diff options
Diffstat (limited to 'src/soc/amd/stoneyridge/ramtop.c')
| -rw-r--r-- | src/soc/amd/stoneyridge/ramtop.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/soc/amd/stoneyridge/ramtop.c b/src/soc/amd/stoneyridge/ramtop.c index 8fa81c715a..c81e73b4e1 100644 --- a/src/soc/amd/stoneyridge/ramtop.c +++ b/src/soc/amd/stoneyridge/ramtop.c @@ -15,6 +15,8 @@ #include <stdint.h> #include <arch/io.h> +#include <cpu/x86/msr.h> +#include <cpu/amd/mtrr.h> #include <cbmem.h> #define CBMEM_TOP_SCRATCHPAD 0x78 @@ -31,3 +33,13 @@ uintptr_t restore_top_of_low_cacheable(void) top_cache = pci_read_config16(PCI_DEV(0,0,0), CBMEM_TOP_SCRATCHPAD); return (top_cache << 16); } + +void *cbmem_top(void) +{ + msr_t tom = rdmsr(TOP_MEM); + + if (!tom.lo) + return 0; + else + return (void *)restore_top_of_low_cacheable(); +} |