diff options
Diffstat (limited to 'arch/x86_64')
| -rw-r--r-- | arch/x86_64/kernel/e820.c | 2 | ||||
| -rw-r--r-- | arch/x86_64/kernel/setup.c | 15 |
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c index 4e34b0f9d61..ab3f87aaff7 100644 --- a/arch/x86_64/kernel/e820.c +++ b/arch/x86_64/kernel/e820.c @@ -17,6 +17,8 @@ #include <linux/ioport.h> #include <linux/string.h> #include <linux/kexec.h> +#include <linux/module.h> + #include <asm/page.h> #include <asm/e820.h> #include <asm/proto.h> diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c index 351d8d64c2f..238f73e1a83 100644 --- a/arch/x86_64/kernel/setup.c +++ b/arch/x86_64/kernel/setup.c @@ -831,11 +831,26 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c) #endif } +#define HWCR 0xc0010015 + static int __init init_amd(struct cpuinfo_x86 *c) { int r; int level; +#ifdef CONFIG_SMP + unsigned long value; + + // Disable TLB flush filter by setting HWCR.FFDIS: + // bit 6 of msr C001_0015 + // + // Errata 63 for SH-B3 steppings + // Errata 122 for all(?) steppings + rdmsrl(HWCR, value); + value |= 1 << 6; + wrmsrl(HWCR, value); +#endif + /* Bit 31 in normal CPUID used for nonstandard 3DNow ID; 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */ clear_bit(0*32+31, &c->x86_capability); |