Change in coreboot[master]: cpu/intel/microcode: Reuse existing function to read MCU revision

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/49839 )

Change subject: cpu/intel/microcode: Reuse existing function to read MCU revision
......................................................................

cpu/intel/microcode: Reuse existing function to read MCU revision

Change-Id: If198fa68c0a29f46906151e667d7b00e2a3ab00d
Signed-off-by: Arthur Heymans 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49839
Tested-by: build bot (Jenkins) 
Reviewed-by: Patrick Rudolph 
Reviewed-by: Angel Pons 
---
M src/cpu/intel/microcode/microcode.c
1 file changed, 4 insertions(+), 10 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Patrick Rudolph: Looks good to me, approved
  Angel Pons: Looks good to me, approved

diff --git a/src/cpu/intel/microcode/microcode.c b/src/cpu/intel/microcode/microcode.c
index 9d6d28b..8673990 100644
--- a/src/cpu/intel/microcode/microcode.c
+++ b/src/cpu/intel/microcode/microcode.c
@@ -123,8 +123,8 @@
    size_t microcode_len;
    u32 eax;
    u32 pf, rev, sig, update_size;
-	unsigned int x86_model, x86_family;
    msr_t msr;
+	struct cpuinfo_x86 c;

if (ucode_updates)
    	return ucode_updates;
@@ -133,19 +133,13 @@
    if (ucode_updates == NULL)
    	return NULL;

-	/* CPUID sets MSR 0x8B if a microcode update has been loaded. */
-	msr.lo = 0;
-	msr.hi = 0;
-	wrmsr(IA32_BIOS_SIGN_ID, msr);
+	rev = read_microcode_rev();
    eax = cpuid_eax(1);
-	msr = rdmsr(IA32_BIOS_SIGN_ID);
-	rev = msr.hi;
-	x86_model = (eax >> 4) & 0x0f;
-	x86_family = (eax >> 8) & 0x0f;
+	get_fms(&c, eax);
    sig = eax;

pf = 0;
-	if ((x86_model >= 5) || (x86_family > 6)) {
+	if ((c.x86_model >= 5) || (c.x86 > 6)) {
    	msr = rdmsr(IA32_PLATFORM_ID);
    	pf = 1 << ((msr.hi >> 18) & 7);
    }