From 58ce8d6d3a7616014dc70fd8d8f945176d74957c Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Mon, 9 Feb 2015 21:42:34 +0100 Subject: [PATCH] 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 --- arch/x86/include/asm/microcode.h | 73 ++++++++++++++++++++ arch/x86/kernel/cpu/microcode/core_early.c | 75 ++++----------------- arch/x86/kernel/cpu/microcode/intel_early.c | 58 +++++----------- 3 files changed, 101 insertions(+), 105 deletions(-) diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h index 201b520521ed..2fb20d6f7e23 100644 --- a/arch/x86/include/asm/microcode.h +++ b/arch/x86/include/asm/microcode.h @@ -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); diff --git a/arch/x86/kernel/cpu/microcode/core_early.c b/arch/x86/kernel/cpu/microcode/core_early.c index d45df4bd16ab..a413a69cbd74 100644 --- a/arch/x86/kernel/cpu/microcode/core_early.c +++ b/arch/x86/kernel/cpu/microcode/core_early.c @@ -23,57 +23,6 @@ #include #include -#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: diff --git a/arch/x86/kernel/cpu/microcode/intel_early.c b/arch/x86/kernel/cpu/microcode/intel_early.c index cd42b3a55897..5c7896bf0e4d 100644 --- a/arch/x86/kernel/cpu/microcode/intel_early.c +++ b/arch/x86/kernel/cpu/microcode/intel_early.c @@ -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 @@ out: 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); -- 2.20.1