Turn on cache on the pci option rom area to improve the performance.
Signed-off-by: Bin Meng <[email protected]>
---
arch/x86/cpu/cpu.c | 27 ++++++++++++++++++++-------
arch/x86/include/asm/mtrr.h | 2 ++
2 files changed, 22 insertions(+), 7 deletions(-)
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index af927b9..b4e0fd9 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -363,13 +363,26 @@ int x86_cpu_init_f(void)
mtrr_cap = native_read_msr(MTRR_CAP_MSR);
if (mtrr_cap & MTRR_CAP_FIX) {
/* Mark the VGA RAM area as uncacheable */
- native_write_msr(MTRR_FIX_16K_A0000_MSR, 0, 0);
-
- /* Mark the PCI ROM area as uncacheable */
- native_write_msr(MTRR_FIX_4K_C0000_MSR, 0, 0);
- native_write_msr(MTRR_FIX_4K_C8000_MSR, 0, 0);
- native_write_msr(MTRR_FIX_4K_D0000_MSR, 0, 0);
- native_write_msr(MTRR_FIX_4K_D8000_MSR, 0, 0);
+ native_write_msr(MTRR_FIX_16K_A0000_MSR,
+ MTRR_FIX_TYPE(MTRR_TYPE_UNCACHEABLE),
+ MTRR_FIX_TYPE(MTRR_TYPE_UNCACHEABLE));
+
+ /*
+ * Mark the PCI ROM area as cacheable to improve ROM
+ * execution performance.
+ */
+ native_write_msr(MTRR_FIX_4K_C0000_MSR,
+ MTRR_FIX_TYPE(MTRR_TYPE_WRBACK),
+ MTRR_FIX_TYPE(MTRR_TYPE_WRBACK));
+ native_write_msr(MTRR_FIX_4K_C8000_MSR,
+ MTRR_FIX_TYPE(MTRR_TYPE_WRBACK),
+ MTRR_FIX_TYPE(MTRR_TYPE_WRBACK));
+ native_write_msr(MTRR_FIX_4K_D0000_MSR,
+ MTRR_FIX_TYPE(MTRR_TYPE_WRBACK),
+ MTRR_FIX_TYPE(MTRR_TYPE_WRBACK));
+ native_write_msr(MTRR_FIX_4K_D8000_MSR,
+ MTRR_FIX_TYPE(MTRR_TYPE_WRBACK),
+ MTRR_FIX_TYPE(MTRR_TYPE_WRBACK));
/* Enable the fixed range MTRRs */
msr_setbits_64(MTRR_DEF_TYPE_MSR, MTRR_DEF_TYPE_FIX_EN);
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
index 70762ee..f9b30f6 100644
--- a/arch/x86/include/asm/mtrr.h
+++ b/arch/x86/include/asm/mtrr.h
@@ -55,6 +55,8 @@
#define MTRR_FIX_4K_F0000_MSR 0x26e
#define MTRR_FIX_4K_F8000_MSR 0x26f
+#define MTRR_FIX_TYPE(t) ((t << 24) | (t << 16) | (t << 8) | t)
+
#if !defined(__ASSEMBLER__)
/**
--
1.8.2.1
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