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Applied patch by Vasilis Kaoutsis: now checks for the MSR feature as well; obviously

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some Pentium 200 MMX pretend to support MTRRs.
This should fix bug #553.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19899 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2007-01-22 14:45:50 +00:00
parent 7954a14f87
commit 9ecaa867f7
2 changed files with 7 additions and 2 deletions
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headers/private/kernel/arch/x86/arch_cpu.h
+1
View File
@@ -22,6 +22,7 @@
#define IA32_MSR_MTRR_PHYSICAL_MASK_0 0x201
// cpuid eax 1 features
#define IA32_FEATURE_MSR (1UL << 5)
#define IA32_FEATURE_MTRR (1UL << 12)
#define IA32_FEATURE_GLOBAL_PAGES (1UL << 13)
#define IA32_FEATURE_SSE (1UL << 25)
src/add-ons/kernel/cpu/x86/generic_x86.cpp
+6 -2
View File
@@ -1,5 +1,5 @@
/*
* Copyright 2005-2006, Haiku, Inc.
* Copyright 2005-2007, Haiku, Inc.
* Distributed under the terms of the MIT License.
*
* Authors:
@@ -48,7 +48,8 @@ generic_count_mtrrs(void)
{
cpuid_info cpuInfo;
if (get_current_cpuid(&cpuInfo, 1) != B_OK
|| (cpuInfo.eax_1.features & IA32_FEATURE_MTRR) == 0)
|| (cpuInfo.eax_1.features & IA32_FEATURE_MTRR) == 0
|| (cpuInfo.eax_1.features & IA32_FEATURE_MSR) == 0)
return 0;
mtrr_capabilities capabilities(x86_read_msr(IA32_MSR_MTRR_CAPABILITIES));
@@ -160,6 +161,9 @@ generic_mtrr_compute_physical_mask(void)
void
generic_dump_mtrrs(uint32 count)
{
if (count == 0)
return;
if (x86_read_msr(IA32_MSR_MTRR_DEFAULT_TYPE) & IA32_MTRR_ENABLE) {
TRACE(("MTRR enabled\n"));
} else {