diff options
Diffstat (limited to 'src/arch/x86')
| -rw-r--r-- | src/arch/x86/include/arch/cpu.h | 6 | ||||
| -rw-r--r-- | src/arch/x86/postcar_loader.c | 12 |
2 files changed, 18 insertions, 0 deletions
diff --git a/src/arch/x86/include/arch/cpu.h b/src/arch/x86/include/arch/cpu.h index 606202197e..9aa446ec0a 100644 --- a/src/arch/x86/include/arch/cpu.h +++ b/src/arch/x86/include/arch/cpu.h @@ -302,6 +302,7 @@ struct postcar_frame { uint32_t upper_mask; int max_var_mtrrs; int num_var_mtrrs; + int skip_common_mtrr; }; /* @@ -323,6 +324,11 @@ void postcar_frame_add_mtrr(struct postcar_frame *pcf, void postcar_frame_add_romcache(struct postcar_frame *pcf, int type); /* + * Add a common MTRR setup most platforms will have as a subset. + */ +void postcar_frame_common_mtrrs(struct postcar_frame *pcf); + +/* * Push used MTRR and Max MTRRs on to the stack * and return pointer to stack top. */ diff --git a/src/arch/x86/postcar_loader.c b/src/arch/x86/postcar_loader.c index 35e139fe1c..b1b2da0540 100644 --- a/src/arch/x86/postcar_loader.c +++ b/src/arch/x86/postcar_loader.c @@ -120,6 +120,18 @@ void postcar_frame_add_romcache(struct postcar_frame *pcf, int type) postcar_frame_add_mtrr(pcf, CACHE_ROM_BASE, CACHE_ROM_SIZE, type); } +void postcar_frame_common_mtrrs(struct postcar_frame *pcf) +{ + if (pcf->skip_common_mtrr) + return; + + /* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */ + postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK); + + /* Cache the ROM as WP just below 4GiB. */ + postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT); +} + void *postcar_commit_mtrrs(struct postcar_frame *pcf) { /* |