diff options
Diffstat (limited to 'src/soc/intel/apollolake')
| -rw-r--r-- | src/soc/intel/apollolake/bootblock/bootblock.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/bootblock/bootblock.c b/src/soc/intel/apollolake/bootblock/bootblock.c index bb3b9c10e9..245645518a 100644 --- a/src/soc/intel/apollolake/bootblock/bootblock.c +++ b/src/soc/intel/apollolake/bootblock/bootblock.c @@ -16,7 +16,9 @@ */ #include <arch/cpu.h> #include <bootblock_common.h> +#include <cpu/x86/mtrr.h> #include <device/pci.h> +#include <lib.h> #include <soc/bootblock.h> #include <soc/cpu.h> #include <soc/gpio.h> @@ -76,6 +78,24 @@ void asmlinkage bootblock_c_entry(void) main(); } +static void cache_bios_region(void) +{ + int mtrr; + uint32_t rom_size, alignment; + + mtrr = get_free_var_mtrr(); + + if (mtrr==-1) + return; + + /* Only the IFD BIOS region is memory mapped (at top of 4G) */ + rom_size = CONFIG_IFD_BIOS_END - CONFIG_IFD_BIOS_START; + /* Round to power of two */ + alignment = 1 << (log2_ceil(rom_size)); + rom_size = ALIGN_UP(rom_size, alignment); + set_var_mtrr(mtrr, 4ULL*GiB - rom_size, rom_size, MTRR_TYPE_WRPROT); +} + void bootblock_soc_early_init(void) { /* Prepare UART for serial console. */ @@ -88,4 +108,5 @@ void bootblock_soc_early_init(void) if (IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC_LPC)) early_lpc_enable(); + cache_bios_region(); } |