[PATCH 2/2] x86: calling early_init_xxx in init_xxx

Yinghai Lu
2008-09-06T08:52:58Z

so
1. could set some cap to ap
2. restore some cap after memset in identify_cpu for boot cpu

esp for CONSTANT_TSC

before this patch:
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow rep_good nopl pni monitor cx16 lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs

after this patch:
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl pni monitor cx16 lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs

constant_tsc is back...

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>

---
arch/x86/kernel/cpu/amd.c | 7 ++-----
arch/x86/kernel/cpu/amd_64.c | 2 ++
arch/x86/kernel/cpu/centaur_64.c | 2 ++
arch/x86/kernel/cpu/common.c | 7 ++++---
arch/x86/kernel/cpu/intel_64.c | 2 ++
5 files changed, 12 insertions(+), 8 deletions(-)

Index: linux-2.6/arch/x86/kernel/cpu/amd.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/amd.c
+++ linux-2.6/arch/x86/kernel/cpu/amd.c
@@ -26,11 +26,8 @@ __asm__(".align 4\nvide: ret");

static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
{
- if (cpuid_eax(0x80000000) >= 0x80000007) {
- c->x86_power = cpuid_edx(0x80000007);
- if (c->x86_power & (1<<8))
- set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
- }
+ if (c->x86_power & (1<<8))
+ set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);

/* Set MTRR capability flag if appropriate */
if (c->x86_model == 13 || c->x86_model == 9 ||
Index: linux-2.6/arch/x86/kernel/cpu/amd_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/amd_64.c
+++ linux-2.6/arch/x86/kernel/cpu/amd_64.c
@@ -140,6 +140,8 @@ static void __cpuinit init_amd(struct cp
}
#endif

+ early_init_amd(c);
+
/* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
clear_cpu_cap(c, 0*32+31);
Index: linux-2.6/arch/x86/kernel/cpu/centaur_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/centaur_64.c
+++ linux-2.6/arch/x86/kernel/cpu/centaur_64.c
@@ -16,6 +16,8 @@ static void __cpuinit early_init_centaur

static void __cpuinit init_centaur(struct cpuinfo_x86 *c)
{
+ early_init_centaur(c);
+
if (c->x86 == 0x6 && c->x86_model >= 0xf) {
c->x86_cache_alignment = c->x86_clflush_size * 2;
set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
Index: linux-2.6/arch/x86/kernel/cpu/common.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/common.c
+++ linux-2.6/arch/x86/kernel/cpu/common.c
@@ -473,9 +473,6 @@ static void __cpuinit get_cpu_cap(struct
c->x86_capability[2] = cpuid_edx(0x80860001);
}

- if (c->extended_cpuid_level >= 0x80000007)
- c->x86_power = cpuid_edx(0x80000007);
-
if (c->extended_cpuid_level >= 0x80000008) {
u32 eax = cpuid_eax(0x80000008);

@@ -483,6 +480,10 @@ static void __cpuinit get_cpu_cap(struct
c->x86_phys_bits = eax & 0xff;
}
#endif
+
+ if (c->extended_cpuid_level >= 0x80000007)
+ c->x86_power = cpuid_edx(0x80000007);
+
}
/*
* Do minimum CPU detection early.
Index: linux-2.6/arch/x86/kernel/cpu/intel_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/intel_64.c
+++ linux-2.6/arch/x86/kernel/cpu/intel_64.c
@@ -54,6 +54,8 @@ static void __cpuinit srat_detect_node(v

static void __cpuinit init_intel(struct cpuinfo_x86 *c)
{
+ early_init_intel(c);
+
init_intel_cacheinfo(c);
if (c->cpuid_level > 9) {
unsigned eax = cpuid_eax(10);