summaryrefslogtreecommitdiff
path: root/src/soc/intel/apollolake
diff options
context:
space:
mode:
authorAndrey Petrov <andrey.petrov@intel.com>2016-04-23 12:31:01 -0700
committerAaron Durbin <adurbin@chromium.org>2016-04-28 05:45:37 +0200
commit0c85b7f4d7180c9307fd95bb887791d4231397a5 (patch)
tree0caa24e1c6b2d70b8d184337e9cc891b58fd10ea /src/soc/intel/apollolake
parente976bd44692d2adb320a1256f1b6bfaa6469108a (diff)
downloadcoreboot-0c85b7f4d7180c9307fd95bb887791d4231397a5.tar.xz
soc/intel/apollolake: Add cache for BIOS ROM
Enable caching of BIOS region with variable MTRR. This is most useful if enabled early such as in bootblock. Change-Id: I39f33ca43f06fce26d1d48e706c97f097e3c10f1 Signed-off-by: Andrey Petrov <andrey.petrov@intel.com> Reviewed-on: https://review.coreboot.org/14480 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/soc/intel/apollolake')
-rw-r--r--src/soc/intel/apollolake/bootblock/bootblock.c21
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();
}