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yaml
---
r: 112799
b: refs/heads/master
c: 0a488a5
h: refs/heads/master
i:
  112797: d035370
  112795: 5692393
  112791: 4f34c65
  112783: 1aeea54
  112767: 78d2889
v: v3
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Yinghai Lu authored and Ingo Molnar committed Sep 4, 2008
1 parent 5706df7 commit d82191d
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Showing 3 changed files with 144 additions and 143 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 01b2e16a7a9be6573cba5d594d6659b3c6cb46a0
refs/heads/master: 0a488a53d7ca46ac638c30079072c57e50cfcc7b
251 changes: 125 additions & 126 deletions trunk/arch/x86/kernel/cpu/common.c
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@

#include "cpu.h"

static struct cpu_dev *this_cpu __cpuinitdata;

DEFINE_PER_CPU(struct gdt_page, gdt_page) = { .gdt = {
[GDT_ENTRY_KERNEL_CS] = { { { 0x0000ffff, 0x00cf9a00 } } },
[GDT_ENTRY_KERNEL_DS] = { { { 0x0000ffff, 0x00cf9200 } } },
Expand Down Expand Up @@ -58,6 +60,109 @@ DEFINE_PER_CPU(struct gdt_page, gdt_page) = { .gdt = {
} };
EXPORT_PER_CPU_SYMBOL_GPL(gdt_page);

static int cachesize_override __cpuinitdata = -1;
static int disable_x86_serial_nr __cpuinitdata = 1;

static int __init cachesize_setup(char *str)
{
get_option(&str, &cachesize_override);
return 1;
}
__setup("cachesize=", cachesize_setup);

/*
* Naming convention should be: <Name> [(<Codename>)]
* This table only is used unless init_<vendor>() below doesn't set it;
* in particular, if CPUID levels 0x80000002..4 are supported, this isn't used
*
*/

/* Look up CPU names by table lookup. */
static char __cpuinit *table_lookup_model(struct cpuinfo_x86 *c)
{
struct cpu_model_info *info;

if (c->x86_model >= 16)
return NULL; /* Range check */

if (!this_cpu)
return NULL;

info = this_cpu->c_models;

while (info && info->family) {
if (info->family == c->x86)
return info->model_names[c->x86_model];
info++;
}
return NULL; /* Not found */
}

static int __init x86_fxsr_setup(char *s)
{
setup_clear_cpu_cap(X86_FEATURE_FXSR);
setup_clear_cpu_cap(X86_FEATURE_XMM);
return 1;
}
__setup("nofxsr", x86_fxsr_setup);

static int __init x86_sep_setup(char *s)
{
setup_clear_cpu_cap(X86_FEATURE_SEP);
return 1;
}
__setup("nosep", x86_sep_setup);

/* Standard macro to see if a specific flag is changeable */
static inline int flag_is_changeable_p(u32 flag)
{
u32 f1, f2;

asm("pushfl\n\t"
"pushfl\n\t"
"popl %0\n\t"
"movl %0,%1\n\t"
"xorl %2,%0\n\t"
"pushl %0\n\t"
"popfl\n\t"
"pushfl\n\t"
"popl %0\n\t"
"popfl\n\t"
: "=&r" (f1), "=&r" (f2)
: "ir" (flag));

return ((f1^f2) & flag) != 0;
}

/* Probe for the CPUID instruction */
static int __cpuinit have_cpuid_p(void)
{
return flag_is_changeable_p(X86_EFLAGS_ID);
}

static void __cpuinit squash_the_stupid_serial_number(struct cpuinfo_x86 *c)
{
if (cpu_has(c, X86_FEATURE_PN) && disable_x86_serial_nr) {
/* Disable processor serial number */
unsigned long lo, hi;
rdmsr(MSR_IA32_BBL_CR_CTL, lo, hi);
lo |= 0x200000;
wrmsr(MSR_IA32_BBL_CR_CTL, lo, hi);
printk(KERN_NOTICE "CPU serial number disabled.\n");
clear_cpu_cap(c, X86_FEATURE_PN);

/* Disabling the serial number may affect the cpuid level */
c->cpuid_level = cpuid_eax(0);
}
}

static int __init x86_serial_nr_setup(char *s)
{
disable_x86_serial_nr = 0;
return 1;
}
__setup("serialnumber", x86_serial_nr_setup);

__u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;

/* Current gdt points %fs at the "master" per-cpu area: after this,
Expand All @@ -72,9 +177,6 @@ void switch_to_new_gdt(void)
asm("mov %0, %%fs" : : "r" (__KERNEL_PERCPU) : "memory");
}

static int cachesize_override __cpuinitdata = -1;
static int disable_x86_serial_nr __cpuinitdata = 1;

static struct cpu_dev *cpu_devs[X86_VENDOR_NUM] = {};

static void __cpuinit default_init(struct cpuinfo_x86 *c)
Expand All @@ -95,14 +197,6 @@ static struct cpu_dev __cpuinitdata default_cpu = {
.c_vendor = "Unknown",
.c_x86_vendor = X86_VENDOR_UNKNOWN,
};
static struct cpu_dev *this_cpu __cpuinitdata;

static int __init cachesize_setup(char *str)
{
get_option(&str, &cachesize_override);
return 1;
}
__setup("cachesize=", cachesize_setup);

int __cpuinit get_model_name(struct cpuinfo_x86 *c)
{
Expand Down Expand Up @@ -133,7 +227,6 @@ int __cpuinit get_model_name(struct cpuinfo_x86 *c)
return 1;
}


void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c)
{
unsigned int n, dummy, ebx, ecx, edx, l2size;
Expand All @@ -150,7 +243,7 @@ void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c)
if (n < 0x80000006) /* Some chips just has a large L1. */
return;

ecx = cpuid_ecx(0x80000006);
cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);
l2size = ecx >> 16;

/* do processor-specific cache resizing */
Expand All @@ -167,48 +260,23 @@ void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c)
c->x86_cache_size = l2size;

printk(KERN_INFO "CPU: L2 Cache: %dK (%d bytes/line)\n",
l2size, ecx & 0xFF);
}

/*
* Naming convention should be: <Name> [(<Codename>)]
* This table only is used unless init_<vendor>() below doesn't set it;
* in particular, if CPUID levels 0x80000002..4 are supported, this isn't used
*
*/

/* Look up CPU names by table lookup. */
static char __cpuinit *table_lookup_model(struct cpuinfo_x86 *c)
{
struct cpu_model_info *info;

if (c->x86_model >= 16)
return NULL; /* Range check */

if (!this_cpu)
return NULL;

info = this_cpu->c_models;

while (info && info->family) {
if (info->family == c->x86)
return info->model_names[c->x86_model];
info++;
}
return NULL; /* Not found */
l2size, ecx & 0xFF);
}

#ifdef CONFIG_X86_HT
void __cpuinit detect_ht(struct cpuinfo_x86 *c)
{
u32 eax, ebx, ecx, edx;
int index_msb, core_bits;

cpuid(1, &eax, &ebx, &ecx, &edx);
u32 eax, ebx, ecx, edx;
int index_msb, core_bits;

if (!cpu_has(c, X86_FEATURE_HT) || cpu_has(c, X86_FEATURE_CMP_LEGACY))
if (!cpu_has(c, X86_FEATURE_HT))
return;

if (cpu_has(c, X86_FEATURE_CMP_LEGACY))
goto out;

cpuid(1, &eax, &ebx, &ecx, &edx);

smp_num_siblings = (ebx & 0xff0000) >> 16;

if (smp_num_siblings == 1) {
Expand All @@ -225,8 +293,6 @@ void __cpuinit detect_ht(struct cpuinfo_x86 *c)
index_msb = get_count_order(smp_num_siblings);
c->phys_proc_id = phys_pkg_id(c->initial_apicid, index_msb);

printk(KERN_INFO "CPU: Physical Processor ID: %d\n",
c->phys_proc_id);

smp_num_siblings = smp_num_siblings / c->x86_max_cores;

Expand All @@ -236,10 +302,14 @@ void __cpuinit detect_ht(struct cpuinfo_x86 *c)

c->cpu_core_id = phys_pkg_id(c->initial_apicid, index_msb) &
((1 << core_bits) - 1);
}

if (c->x86_max_cores > 1)
printk(KERN_INFO "CPU: Processor Core ID: %d\n",
c->cpu_core_id);
out:
if ((c->x86_max_cores * smp_num_siblings) > 1) {
printk(KERN_INFO "CPU: Physical Processor ID: %d\n",
c->phys_proc_id);
printk(KERN_INFO "CPU: Processor Core ID: %d\n",
c->cpu_core_id);
}
}
#endif
Expand Down Expand Up @@ -273,52 +343,6 @@ static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c)
this_cpu = &default_cpu;
}


static int __init x86_fxsr_setup(char *s)
{
setup_clear_cpu_cap(X86_FEATURE_FXSR);
setup_clear_cpu_cap(X86_FEATURE_XMM);
return 1;
}
__setup("nofxsr", x86_fxsr_setup);


static int __init x86_sep_setup(char *s)
{
setup_clear_cpu_cap(X86_FEATURE_SEP);
return 1;
}
__setup("nosep", x86_sep_setup);


/* Standard macro to see if a specific flag is changeable */
static inline int flag_is_changeable_p(u32 flag)
{
u32 f1, f2;

asm("pushfl\n\t"
"pushfl\n\t"
"popl %0\n\t"
"movl %0,%1\n\t"
"xorl %2,%0\n\t"
"pushl %0\n\t"
"popfl\n\t"
"pushfl\n\t"
"popl %0\n\t"
"popfl\n\t"
: "=&r" (f1), "=&r" (f2)
: "ir" (flag));

return ((f1^f2) & flag) != 0;
}


/* Probe for the CPUID instruction */
static int __cpuinit have_cpuid_p(void)
{
return flag_is_changeable_p(X86_EFLAGS_ID);
}

void __cpuinit cpu_detect(struct cpuinfo_x86 *c)
{
/* Get vendor name */
Expand Down Expand Up @@ -380,16 +404,16 @@ static void __cpuinit get_cpu_cap(struct cpuinfo_x86 *c)
*/
static void __init early_identify_cpu(struct cpuinfo_x86 *c)
{
c->x86_cache_alignment = 32;
c->x86_clflush_size = 32;
c->x86_cache_alignment = c->x86_clflush_size;

if (!have_cpuid_p())
return;

c->extended_cpuid_level = 0;

memset(&c->x86_capability, 0, sizeof c->x86_capability);

c->extended_cpuid_level = 0;

cpu_detect(c);

get_cpu_vendor(c);
Expand Down Expand Up @@ -487,31 +511,6 @@ static void __cpuinit generic_identify(struct cpuinfo_x86 *c)
detect_nopl(c);
}

static void __cpuinit squash_the_stupid_serial_number(struct cpuinfo_x86 *c)
{
if (cpu_has(c, X86_FEATURE_PN) && disable_x86_serial_nr) {
/* Disable processor serial number */
unsigned long lo, hi;
rdmsr(MSR_IA32_BBL_CR_CTL, lo, hi);
lo |= 0x200000;
wrmsr(MSR_IA32_BBL_CR_CTL, lo, hi);
printk(KERN_NOTICE "CPU serial number disabled.\n");
clear_cpu_cap(c, X86_FEATURE_PN);

/* Disabling the serial number may affect the cpuid level */
c->cpuid_level = cpuid_eax(0);
}
}

static int __init x86_serial_nr_setup(char *s)
{
disable_x86_serial_nr = 0;
return 1;
}
__setup("serialnumber", x86_serial_nr_setup);



/*
* This does the hard work of actually picking apart the CPU stuff...
*/
Expand Down
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