---

yaml --- r: 6977 b: refs/heads/master c: 245067d h: refs/heads/master i: 6975: db9f281 v: v3
git-mirror · Sep 5, 2005 · 8d7cb65 · 8d7cb65
1 parent 7d31140
commit 8d7cb65
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Showing 4 changed files with 16 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4bb0d3ec3e5b1e9e2399cdc641b3b6521ac9cdaa
+refs/heads/master: 245067d1674d451855692fcd4647daf9fd47f82d
diff --git a/trunk/arch/i386/kernel/microcode.c b/trunk/arch/i386/kernel/microcode.c
@@ -164,7 +164,8 @@ static void collect_cpu_info (void *unused)
 	}
 
 	wrmsr(MSR_IA32_UCODE_REV, 0, 0);
-	__asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
+	/* see notes above for revision 1.07.  Apparent chip bug */
+	serialize_cpu();
 	/* get the current revision from MSR 0x8B */
 	rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
 	pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
@@ -377,7 +378,9 @@ static void do_update_one (void * unused)
 		(unsigned long) uci->mc->bits >> 16 >> 16);
 	wrmsr(MSR_IA32_UCODE_REV, 0, 0);
 
-	__asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
+	/* see notes above for revision 1.07.  Apparent chip bug */
+	serialize_cpu();
+
 	/* get the current revision from MSR 0x8B */
 	rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
 

diff --git a/trunk/include/asm-i386/processor.h b/trunk/include/asm-i386/processor.h
@@ -277,6 +277,11 @@ static inline void clear_in_cr4 (unsigned long mask)
 	outb((data), 0x23); \
 } while (0)
 
+static inline void serialize_cpu(void)
+{
+	 __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
+}
+
 static inline void __monitor(const void *eax, unsigned long ecx,
 		unsigned long edx)
 {

diff --git a/trunk/include/asm-x86_64/processor.h b/trunk/include/asm-x86_64/processor.h
@@ -437,6 +437,11 @@ static inline void prefetchw(void *x)
 	outb((data), 0x23); \
 } while (0)
 
+static inline void serialize_cpu(void)
+{
+	__asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
+}
+
 static inline void __monitor(const void *eax, unsigned long ecx,
 		unsigned long edx)
 {