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Subject[RFC PATCH 14/35] Subarch support for CPUID instruction
Allow subarchitectures to modify the CPUID instruction.  This allows
the subarch to provide a limited set of CPUID feature flags during CPU
identification. Add a subarch implementation for Xen that traps to the
hypervisor where unsupported feature flags can be hidden from guests.

Signed-off-by: Ian Pratt <ian.pratt@xensource.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
arch/i386/kernel/head-cpu.S | 4 ++--
include/asm-i386/mach-default/mach_processor.h | 7 +++++++
include/asm-i386/mach-xen/mach_processor.h | 9 +++++++++
include/asm-i386/processor.h | 13 +++++++------
4 files changed, 25 insertions(+), 8 deletions(-)
--- linus-2.6.orig/include/asm-i386/processor.h
+++ linus-2.6/include/asm-i386/processor.h
@@ -21,6 +21,7 @@
#include <linux/threads.h>
#include <asm/percpu.h>
#include <linux/cpumask.h>
+#include <mach_processor.h>

/* flag for disabling the tsc */
extern int tsc_disable;
@@ -148,7 +149,7 @@ static inline void detect_ht(struct cpui
*/
static inline void cpuid(unsigned int op, unsigned int *eax, unsigned int *ebx, unsigned int *ecx, unsigned int *edx)
{
- __asm__("cpuid"
+ __asm__(CPUID_STR
: "=a" (*eax),
"=b" (*ebx),
"=c" (*ecx),
@@ -160,7 +161,7 @@ static inline void cpuid(unsigned int op
static inline void cpuid_count(int op, int count, int *eax, int *ebx, int *ecx,
int *edx)
{
- __asm__("cpuid"
+ __asm__(CPUID_STR
: "=a" (*eax),
"=b" (*ebx),
"=c" (*ecx),
@@ -175,7 +176,7 @@ static inline unsigned int cpuid_eax(uns
{
unsigned int eax;

- __asm__("cpuid"
+ __asm__(CPUID_STR
: "=a" (eax)
: "0" (op)
: "bx", "cx", "dx");
@@ -185,7 +186,7 @@ static inline unsigned int cpuid_ebx(uns
{
unsigned int eax, ebx;

- __asm__("cpuid"
+ __asm__(CPUID_STR
: "=a" (eax), "=b" (ebx)
: "0" (op)
: "cx", "dx" );
@@ -195,7 +196,7 @@ static inline unsigned int cpuid_ecx(uns
{
unsigned int eax, ecx;

- __asm__("cpuid"
+ __asm__(CPUID_STR
: "=a" (eax), "=c" (ecx)
: "0" (op)
: "bx", "dx" );
@@ -205,7 +206,7 @@ static inline unsigned int cpuid_edx(uns
{
unsigned int eax, edx;

- __asm__("cpuid"
+ __asm__(CPUID_STR
: "=a" (eax), "=d" (edx)
: "0" (op)
: "bx", "cx");
--- linus-2.6.orig/arch/i386/kernel/head-cpu.S
+++ linus-2.6/arch/i386/kernel/head-cpu.S
@@ -59,7 +59,7 @@
.macro CPUID_GET_VENDOR_INFO cpuid_level, x86_vendor_id
/* get vendor info */
xorl %eax,%eax # call CPUID with 0 -> return vendor ID
- cpuid
+ CPUID
movl %eax,\cpuid_level # save CPUID level
movl %ebx,\x86_vendor_id # lo 4 chars
movl %edx,\x86_vendor_id+4 # next 4 chars
@@ -75,7 +75,7 @@
*/
.macro CPUID_GET_CPU_TYPE family, model, mask, capability
movl $1,%eax # Use the CPUID instruction to get CPU type
- cpuid
+ CPUID
movb %al,%cl # save reg for future use
andb $0x0f,%ah # mask processor family
movb %ah,\family
--- /dev/null
+++ linus-2.6/include/asm-i386/mach-default/mach_processor.h
@@ -0,0 +1,7 @@
+#ifndef __ASM_MACH_PROCESSOR_H
+#define __ASM_MACH_PROCESSOR_H
+
+#define CPUID cpuid
+#define CPUID_STR "cpuid"
+
+#endif /* __ASM_MACH_PROCESSOR_H */
--- /dev/null
+++ linus-2.6/include/asm-i386/mach-xen/mach_processor.h
@@ -0,0 +1,9 @@
+#ifndef __ASM_MACH_PROCESSOR_H
+#define __ASM_MACH_PROCESSOR_H
+
+#include <xen/interface/arch-x86_32.h>
+
+#define CPUID XEN_CPUID
+#define CPUID_STR XEN_CPUID
+
+#endif /* __ASM_MACH_PROCESSOR_H */
--
-
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