qemu: add x86 cpu

This patch adds a qemu x86 cpu chip.  It has no initialization function
as this isn't needed on virtual hardware.  A virtual machine can have
pretty much any CPU: qemu emulates a wide range of x86 CPUs (try 'qemu
-cpu ? for a list), also with 'qemu -cpu host' the guest will see a cpu
which is (almost) identical to the one on the host machine.  So I've
added X86_VENDOR_ANY as wildcard match for the cpu_table.

Change-Id: Ib01210694b09702e41ed806f31d0033e840a863f
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-on: http://review.coreboot.org/3344
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/arch/x86/include/arch/cpu.h

@@ -138,6 +138,7 @@ static inline unsigned int cpuid_edx(unsigned int op)
 #define X86_VENDOR_TRANSMETA  8
 #define X86_VENDOR_NSC        9
 #define X86_VENDOR_SIS       10
+#define X86_VENDOR_ANY     0xfe
 #define X86_VENDOR_UNKNOWN 0xff
 
 #if !defined(__PRE_RAM__) && !defined(__SMM__)

src/arch/x86/lib/cpu.c

@@ -223,6 +223,8 @@ struct cpu_driver *find_cpu_driver(struct device *cpu)
 			{
 				return driver;
 			}
+			if (X86_VENDOR_ANY == id->vendor)
+				return driver;
 		}
 	}
 	return NULL;