Rather obvious one :)
What happens is we execute cpuid as serializing, but don't tell gcc this
invalidates %eax, %ebx, %ecx, and %edx. This should be corrected by this
patch:
diff -ur linux/arch/i386/kernel/microcode.c linux-prumpf/arch/i386/kernel/microcode.c
--- linux/arch/i386/kernel/microcode.c Fri Jun 9 19:05:09 2000
+++ linux-prumpf/arch/i386/kernel/microcode.c Fri Jun 9 19:06:19 2000
@@ -227,7 +227,7 @@
}
wrmsr(0x79, (unsigned int)(m->bits), 0);
- __asm__ __volatile__ ("cpuid");
+ __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx", "cc");
rdmsr(0x8B, val[0], val[1]);
req->err = 0;
Tigran, does this look okay to you ?
Philipp Rumpf
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