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x86/microcode: Consolidate family,model, ... code 

... to the header. Split the family acquiring function into a
main one, doing CPUID and a helper which computes the extended
family and is used in multiple places. Get rid of the locally-grown
get_x86_{family,model}().

While at it, rename local variables to something more descriptive and
vertically align assignments for better readability.

There should be no functionality change resulting from this patch.

Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Borislav Petkov 2015-02-09 21:42:34 +01:00
parent 4f5e5f2b57
commit 58ce8d6d3a
3 changed files with 101 additions and 105 deletions
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73
arch/x86/include/asm/microcode.h
View File

@ -75,6 +75,79 @@ static inline void __exit exit_amd_microcode(void) {}
#ifdef CONFIG_MICROCODE_EARLY
#define MAX_UCODE_COUNT 128
#define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
#define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
#define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
#define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
#define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
#define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
#define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
#define CPUID_IS(a, b, c, ebx, ecx, edx) \
(!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))
/*
* In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
* x86_vendor() gets vendor id for BSP.
*
* In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
* coding, we still use x86_vendor() to get vendor id for AP.
*
* x86_vendor() gets vendor information directly from CPUID.
*/
static inline int x86_vendor(void)
{
u32 eax = 0x00000000;
u32 ebx, ecx = 0, edx;
native_cpuid(&eax, &ebx, &ecx, &edx);
if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
return X86_VENDOR_INTEL;
if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
return X86_VENDOR_AMD;
return X86_VENDOR_UNKNOWN;
}
static inline unsigned int __x86_family(unsigned int sig)
{
unsigned int x86;
x86 = (sig >> 8) & 0xf;
if (x86 == 0xf)
x86 += (sig >> 20) & 0xff;
return x86;
}
static inline unsigned int x86_family(void)
{
u32 eax = 0x00000001;
u32 ebx, ecx = 0, edx;
native_cpuid(&eax, &ebx, &ecx, &edx);
return __x86_family(eax);
}
static inline unsigned int x86_model(unsigned int sig)
{
unsigned int x86, model;
x86 = __x86_family(sig);
model = (sig >> 4) & 0xf;
if (x86 == 0x6 || x86 == 0xf)
model += ((sig >> 16) & 0xf) << 4;
return model;
}
extern void __init load_ucode_bsp(void);
extern void load_ucode_ap(void);
extern int __init save_microcode_in_initrd(void);

75
arch/x86/kernel/cpu/microcode/core_early.c
View File

@ -23,57 +23,6 @@
#include <asm/processor.h>
#include <asm/cmdline.h>
#define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
#define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
#define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
#define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
#define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
#define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
#define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
#define CPUID_IS(a, b, c, ebx, ecx, edx) \
(!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))
/*
* In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
* x86_vendor() gets vendor id for BSP.
*
* In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
* coding, we still use x86_vendor() to get vendor id for AP.
*
* x86_vendor() gets vendor information directly through cpuid.
*/
static int x86_vendor(void)
{
u32 eax = 0x00000000;
u32 ebx, ecx = 0, edx;
native_cpuid(&eax, &ebx, &ecx, &edx);
if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
return X86_VENDOR_INTEL;
if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
return X86_VENDOR_AMD;
return X86_VENDOR_UNKNOWN;
}
static int x86_family(void)
{
u32 eax = 0x00000001;
u32 ebx, ecx = 0, edx;
int x86;
native_cpuid(&eax, &ebx, &ecx, &edx);
x86 = (eax >> 8) & 0xf;
if (x86 == 15)
x86 += (eax >> 20) & 0xff;
return x86;
}
static bool __init check_loader_disabled_bsp(void)
{
#ifdef CONFIG_X86_32
@ -96,7 +45,7 @@ static bool __init check_loader_disabled_bsp(void)
void __init load_ucode_bsp(void)
{
int vendor, x86;
int vendor, family;
if (check_loader_disabled_bsp())
return;
@ -105,15 +54,15 @@ void __init load_ucode_bsp(void)
return;
vendor = x86_vendor();
x86 = x86_family();
family = x86_family();
switch (vendor) {
case X86_VENDOR_INTEL:
if (x86 >= 6)
if (family >= 6)
load_ucode_intel_bsp();
break;
case X86_VENDOR_AMD:
if (x86 >= 0x10)
if (family >= 0x10)
load_ucode_amd_bsp();
break;
default:
@ -132,7 +81,7 @@ static bool check_loader_disabled_ap(void)
void load_ucode_ap(void)
{
int vendor, x86;
int vendor, family;
if (check_loader_disabled_ap())
return;
@ -141,15 +90,15 @@ void load_ucode_ap(void)
return;
vendor = x86_vendor();
x86 = x86_family();
family = x86_family();
switch (vendor) {
case X86_VENDOR_INTEL:
if (x86 >= 6)
if (family >= 6)
load_ucode_intel_ap();
break;
case X86_VENDOR_AMD:
if (x86 >= 0x10)
if (family >= 0x10)
load_ucode_amd_ap();
break;
default:
@ -179,18 +128,18 @@ int __init save_microcode_in_initrd(void)
void reload_early_microcode(void)
{
int vendor, x86;
int vendor, family;
vendor = x86_vendor();
x86 = x86_family();
family = x86_family();
switch (vendor) {
case X86_VENDOR_INTEL:
if (x86 >= 6)
if (family >= 6)
reload_ucode_intel();
break;
case X86_VENDOR_AMD:
if (x86 >= 0x10)
if (family >= 0x10)
reload_ucode_amd();
break;
default:

58
arch/x86/kernel/cpu/microcode/intel_early.c
View File

@ -126,31 +126,6 @@ load_microcode(struct mc_saved_data *mc_saved_data,
}
}
static u8 get_x86_family(unsigned long sig)
{
u8 x86;
x86 = (sig >> 8) & 0xf;
if (x86 == 0xf)
x86 += (sig >> 20) & 0xff;
return x86;
}
static u8 get_x86_model(unsigned long sig)
{
u8 x86, x86_model;
x86 = get_x86_family(sig);
x86_model = (sig >> 4) & 0xf;
if (x86 == 0x6 || x86 == 0xf)
x86_model += ((sig >> 16) & 0xf) << 4;
return x86_model;
}
/*
* Given CPU signature and a microcode patch, this function finds if the
* microcode patch has matching family and model with the CPU.
@ -159,41 +134,40 @@ static enum ucode_state
matching_model_microcode(struct microcode_header_intel *mc_header,
unsigned long sig)
{
u8 x86, x86_model;
u8 x86_ucode, x86_model_ucode;
unsigned int fam, model;
unsigned int fam_ucode, model_ucode;
struct extended_sigtable *ext_header;
unsigned long total_size = get_totalsize(mc_header);
unsigned long data_size = get_datasize(mc_header);
int ext_sigcount, i;
struct extended_signature *ext_sig;
x86 = get_x86_family(sig);
x86_model = get_x86_model(sig);
fam = __x86_family(sig);
model = x86_model(sig);
x86_ucode = get_x86_family(mc_header->sig);
x86_model_ucode = get_x86_model(mc_header->sig);
fam_ucode = __x86_family(mc_header->sig);
model_ucode = x86_model(mc_header->sig);
if (x86 == x86_ucode && x86_model == x86_model_ucode)
if (fam == fam_ucode && model == model_ucode)
return UCODE_OK;
/* Look for ext. headers: */
if (total_size <= data_size + MC_HEADER_SIZE)
return UCODE_NFOUND;
ext_header = (void *) mc_header + data_size + MC_HEADER_SIZE;
ext_header = (void *) mc_header + data_size + MC_HEADER_SIZE;
ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
ext_sigcount = ext_header->count;
ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
for (i = 0; i < ext_sigcount; i++) {
x86_ucode = get_x86_family(ext_sig->sig);
x86_model_ucode = get_x86_model(ext_sig->sig);
fam_ucode = __x86_family(ext_sig->sig);
model_ucode = x86_model(ext_sig->sig);
if (x86 == x86_ucode && x86_model == x86_model_ucode)
if (fam == fam_ucode && model == model_ucode)
return UCODE_OK;
ext_sig++;
}
return UCODE_NFOUND;
}
@ -374,7 +348,7 @@ get_matching_model_microcode(int cpu, unsigned long start,
static int collect_cpu_info_early(struct ucode_cpu_info *uci)
{
unsigned int val[2];
u8 x86, x86_model;
unsigned int family, model;
struct cpu_signature csig;
unsigned int eax, ebx, ecx, edx;
@ -389,10 +363,10 @@ static int collect_cpu_info_early(struct ucode_cpu_info *uci)
native_cpuid(&eax, &ebx, &ecx, &edx);
csig.sig = eax;
x86 = get_x86_family(csig.sig);
x86_model = get_x86_model(csig.sig);
family = __x86_family(csig.sig);
model = x86_model(csig.sig);
if ((x86_model >= 5) || (x86 > 6)) {
if ((model >= 5) || (family > 6)) {
/* get processor flags from MSR 0x17 */
native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
csig.pf = 1 << ((val[1] >> 18) & 7);