[PATCH v5 11/35] x86/cpu: Use parsed CPUID(0x1)

At the early boot CPU detection code, use parsed CPUID(0x1) access
instead of a direct CPUID query.

Beside the CPUID parser centralization benefits, this allows using the
auto-generated <asm/cpuid/leaf_types.h> data types, and their full C99
bitfields, instead of doing ugly bitwise operations on CPUID register
output.

Signed-off-by: Ahmed S. Darwish <[email protected]>
---
 arch/x86/kernel/cpu/common.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index e081f92ddfe9..f989c8099490 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -897,6 +897,7 @@ void get_cpu_vendor(struct cpuinfo_x86 *c)
 void cpu_detect(struct cpuinfo_x86 *c)
 {
 	const struct leaf_0x0_0 *l0 = cpuid_leaf(c, 0x0);
+	const struct leaf_0x1_0 *l1 = cpuid_leaf(c, 0x1);
 
 	c->cpuid_level = l0->max_std_leaf;
 	*(u32 *)&c->x86_vendor_id[0] = l0->cpu_vendorid_0;
@@ -904,17 +905,14 @@ void cpu_detect(struct cpuinfo_x86 *c)
 	*(u32 *)&c->x86_vendor_id[8] = l0->cpu_vendorid_2;
 
 	c->x86 = 4;
-	/* Intel-defined flags: level 0x00000001 */
-	if (c->cpuid_level >= 0x00000001) {
-		u32 junk, tfms, cap0, misc;
 
-		cpuid(0x00000001, &tfms, &misc, &junk, &cap0);
-		c->x86		= x86_family(tfms);
-		c->x86_model	= x86_model(tfms);
-		c->x86_stepping	= x86_stepping(tfms);
+	if (l1) {
+		c->x86		= cpuid_family(l1);
+		c->x86_model	= cpuid_model(l1);
+		c->x86_stepping	= l1->stepping;
 
-		if (cap0 & (1<<19)) {
-			c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
+		if (l1->clflush) {
+			c->x86_clflush_size = l1->clflush_size * 8;
 			c->x86_cache_alignment = c->x86_clflush_size;
 		}
 	}
-- 
2.50.1