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| author | Ingo Molnar <mingo@elte.hu> | 2008-09-14 16:24:00 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-14 16:24:00 (GMT) |
| commit | 83bd6998b04fc1bb7280b14f16b2bdbdc07c914b (patch) | |
| tree | af1bbe2bac5752b69b1ac58bf5d822c735da439b /arch/x86/kernel/cpu/mtrr/generic.c | |
| parent | e7250b8ae3870f37f660c2f65cafcaba85e3bfd3 (diff) | |
| parent | adee14b2e1557d0a8559f29681732d05a89dfc35 (diff) | |
| download | linux-fsl-qoriq-83bd6998b04fc1bb7280b14f16b2bdbdc07c914b.tar.xz | |
Merge commit 'v2.6.27-rc6' into timers/hpet
Diffstat (limited to 'arch/x86/kernel/cpu/mtrr/generic.c')
| -rw-r--r-- | arch/x86/kernel/cpu/mtrr/generic.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c index 509bd3d..cb7d3b6 100644 --- a/arch/x86/kernel/cpu/mtrr/generic.c +++ b/arch/x86/kernel/cpu/mtrr/generic.c @@ -379,6 +379,7 @@ static void generic_get_mtrr(unsigned int reg, unsigned long *base, unsigned long *size, mtrr_type *type) { unsigned int mask_lo, mask_hi, base_lo, base_hi; + unsigned int tmp, hi; rdmsr(MTRRphysMask_MSR(reg), mask_lo, mask_hi); if ((mask_lo & 0x800) == 0) { @@ -392,8 +393,23 @@ static void generic_get_mtrr(unsigned int reg, unsigned long *base, rdmsr(MTRRphysBase_MSR(reg), base_lo, base_hi); /* Work out the shifted address mask. */ - mask_lo = size_or_mask | mask_hi << (32 - PAGE_SHIFT) - | mask_lo >> PAGE_SHIFT; + tmp = mask_hi << (32 - PAGE_SHIFT) | mask_lo >> PAGE_SHIFT; + mask_lo = size_or_mask | tmp; + /* Expand tmp with high bits to all 1s*/ + hi = fls(tmp); + if (hi > 0) { + tmp |= ~((1<<(hi - 1)) - 1); + + if (tmp != mask_lo) { + static int once = 1; + + if (once) { + printk(KERN_INFO "mtrr: your BIOS has set up an incorrect mask, fixing it up.\n"); + once = 0; + } + mask_lo = tmp; + } + } /* This works correctly if size is a power of two, i.e. a contiguous range. */ |