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;

src/cpu/Kconfig

@@ -14,6 +14,7 @@ if ARCH_X86
 source src/cpu/amd/Kconfig
 source src/cpu/intel/Kconfig
 source src/cpu/via/Kconfig
+source src/cpu/qemu-x86/Kconfig
 source src/cpu/x86/Kconfig
 
 config CACHE_AS_RAM

src/cpu/Makefile.inc

@@ -8,6 +8,7 @@ subdirs-y += samsung
 subdirs-y += ti
 subdirs-y += via
 subdirs-y += x86
+subdirs-$(CONFIG_CPU_QEMU_X86) += qemu-x86
 
 ################################################################################
 ## Rules for building the microcode blob in CBFS

src/cpu/qemu-x86/Kconfig

@@ -0,0 +1,21 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2013 Gerd Hoffmann <kraxel@redhat.com>
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; version 2 of the License.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+##
+
+config CPU_QEMU_X86
+	bool

src/cpu/qemu-x86/Makefile.inc

@@ -0,0 +1,21 @@
+##
+## This file is part of the coreboot project.
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+##
+
+ramstage-y += qemu.c
+subdirs-y += ../x86/mtrr
+subdirs-y += ../x86/lapic

src/cpu/qemu-x86/qemu.c

@@ -0,0 +1,37 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <cpu/cpu.h>
+#include <device/device.h>
+
+static struct device_operations cpu_dev_ops = {
+};
+
+static struct cpu_device_id cpu_table[] = {
+	{ X86_VENDOR_ANY, 0 },
+	{ 0, 0 },
+};
+
+static const struct cpu_driver driver __cpu_driver = {
+	.ops      = &cpu_dev_ops,
+	.id_table = cpu_table,
+};
+
+struct chip_operations cpu_x86_qemu_ops = {
+	CHIP_NAME("QEMU x86 CPU")
+};