diff options
Diffstat (limited to 'src/soc/intel/common')
| -rw-r--r-- | src/soc/intel/common/block/fast_spi/fast_spi.c | 25 | ||||
| -rw-r--r-- | src/soc/intel/common/block/include/intelblocks/fast_spi.h | 4 |
2 files changed, 29 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/fast_spi/fast_spi.c b/src/soc/intel/common/block/fast_spi/fast_spi.c index 603af16881..a53499eba6 100644 --- a/src/soc/intel/common/block/fast_spi/fast_spi.c +++ b/src/soc/intel/common/block/fast_spi/fast_spi.c @@ -18,8 +18,10 @@ #include <device/pci_def.h> #include <commonlib/helpers.h> #include <console/console.h> +#include <cpu/x86/mtrr.h> #include <fast_spi_def.h> #include <intelblocks/fast_spi.h> +#include <lib.h> #include <soc/intel/common/spi_flash.h> #include <soc/pci_devs.h> #include <spi_flash.h> @@ -175,6 +177,29 @@ size_t fast_spi_get_bios_region(size_t *bios_size) return bios_start; } +void fast_spi_cache_bios_region(void) +{ + int mtrr; + size_t bios_size; + uint32_t alignment; + + mtrr = get_free_var_mtrr(); + + if (mtrr == -1) + return; + + /* Only the IFD BIOS region is memory mapped (at top of 4G) */ + fast_spi_get_bios_region(&bios_size); + + if (!bios_size) + return; + + /* Round to power of two */ + alignment = 1 << (log2_ceil(bios_size)); + bios_size = ALIGN_UP(bios_size, alignment); + set_var_mtrr(mtrr, 4ULL*GiB - bios_size, bios_size, MTRR_TYPE_WRPROT); +} + /* * Program temporary BAR for SPI in case any of the stages before ramstage need * to access FAST_SPI MMIO regs. Ramstage will assign a new BAR during PCI diff --git a/src/soc/intel/common/block/include/intelblocks/fast_spi.h b/src/soc/intel/common/block/include/intelblocks/fast_spi.h index e4bddc4e45..6294001d23 100644 --- a/src/soc/intel/common/block/include/intelblocks/fast_spi.h +++ b/src/soc/intel/common/block/include/intelblocks/fast_spi.h @@ -57,6 +57,10 @@ void fast_spi_set_strap_msg_data(uint32_t soft_reset_data); */ size_t fast_spi_get_bios_region(size_t *bios_size); /* + * Cache the memory-mapped BIOS region as write-protect type. + */ +void fast_spi_cache_bios_region(void); +/* * Program temporary BAR for FAST_SPI in case any of the stages before ramstage * need to access FAST_SPI MMIO regs. Ramstage will assign a new BAR during PCI * enumeration. Also, Disable the BIOS write protect and Enable Prefetching and |