diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2016-11-10 20:04:19 -0600 |
|---|---|---|
| committer | Aaron Durbin <adurbin@chromium.org> | 2016-11-12 04:06:47 +0100 |
| commit | bf696f56021b26596121b060df6bb2f4172231eb (patch) | |
| tree | 700d5ded2242c3e1e47c37e3fe73137de48cd295 | |
| parent | 2bebd7bc93e248f5bdf5677d07802eb9e14528b0 (diff) | |
soc/intel/apollolake: cache the MMIO BIOS region
If the boot media is memory mapped temporarily mark it as write
protect MTRR type so that memory-mapped accesses are faster.
Depthcharge payload loading was sped up by 75ms using this.
BUG=chrome-os-partner:56656,chrome-os-partner:59682
Change-Id: Iba87a51a05559d81b8e00fa4f6824dacf7a661f5
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/17372
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
| -rw-r--r-- | src/soc/intel/apollolake/cpu.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/cpu.c b/src/soc/intel/apollolake/cpu.c index 6b5dee2339..e2d3a9dae7 100644 --- a/src/soc/intel/apollolake/cpu.c +++ b/src/soc/intel/apollolake/cpu.c @@ -183,4 +183,9 @@ void apollolake_init_cpus(device_t dev) /* Clear for take-off */ if (mp_init_with_smm(dev->link_list, &mp_ops) < 0) printk(BIOS_ERR, "MP initialization failure.\n"); + + /* Temporarily cache the memory-mapped boot media. */ + if (IS_ENABLED(CONFIG_BOOT_DEVICE_MEMORY_MAPPED)) + mtrr_use_temp_range(-CONFIG_ROM_SIZE, CONFIG_ROM_SIZE, + MTRR_TYPE_WRPROT); } |