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>

2 files changed, 28 insertions, 105 deletions

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 <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:
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);