diff options
| author | Duncan Laurie <dlaurie@chromium.org> | 2012-01-09 22:05:18 -0800 |
|---|---|---|
| committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2012-03-30 17:56:10 +0200 |
| commit | 7b67892be88e3f12de91314ca45a834b4c84c719 (patch) | |
| tree | f7e2fadeb00c47a32adb451b81538c26280c16cc /src/cpu/x86/mtrr | |
| parent | 527fc74a83a7b0fdeebfeb9ddd5890f11f01c102 (diff) | |
Make MTRR min hole alignment 64MB
This affects the algorithm when determining when to
transform a range into a larger range with a hole.
It is needed when for when I switch on an 8MB TSEG
and cause the memory maps to go crazy.
Also add header defines for the SMRR.
Change-Id: I1a06ccc28ef139cc79f655a8b19fd3533aca0401
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: http://review.coreboot.org/765
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/cpu/x86/mtrr')
| -rw-r--r-- | src/cpu/x86/mtrr/mtrr.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/cpu/x86/mtrr/mtrr.c b/src/cpu/x86/mtrr/mtrr.c index 5f5e02bbb1..ed7d93bd06 100644 --- a/src/cpu/x86/mtrr/mtrr.c +++ b/src/cpu/x86/mtrr/mtrr.c @@ -265,13 +265,16 @@ static unsigned int range_to_mtrr(unsigned int reg, return reg; } - if (above4gb == 2 && type == MTRR_TYPE_WRBACK && range_sizek % 0x4000) { +#define MIN_ALIGN 0x10000 /* 64MB */ + + if (above4gb == 2 && type == MTRR_TYPE_WRBACK && + range_sizek > MIN_ALIGN && range_sizek % MIN_ALIGN) { /* - * If this range is not divisible by 16MB then instead + * If this range is not divisible then instead * make a larger range and carve out an uncached hole. */ hole_startk = range_startk + range_sizek; - hole_sizek = 0x4000 - (range_sizek % 0x4000); + hole_sizek = MIN_ALIGN - (range_sizek % MIN_ALIGN); range_sizek += hole_sizek; } |