Turn on cache on the pci option rom area to improve the performance.

Signed-off-by: Bin Meng bmeng.cn@gmail.com ---

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__)

/**