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@xxxxxxxxxxxxx>
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
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(-)
diff -r 122f3fbdb7a4 arch/i386/kernel/head-cpu.S
--- a/arch/i386/kernel/head-cpu.S Thu Jun 22 20:30:11 2006 -0400
+++ b/arch/i386/kernel/head-cpu.S Thu Jun 22 20:38:07 2006 -0400
@@ -1,4 +1,6 @@
/* Some macros for head.S */
+
+#include <mach_processor.h>
.macro CPU_GDT_TABLE
.quad 0x0000000000000000 /* NULL descriptor */
@@ -57,7 +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
@@ -73,7 +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
diff -r 122f3fbdb7a4 include/asm-i386/processor.h
--- a/include/asm-i386/processor.h Thu Jun 22 20:30:11 2006 -0400
+++ b/include/asm-i386/processor.h Thu Jun 22 20:38:07 2006 -0400
@@ -20,6 +20,7 @@
#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;
@@ -147,7 +148,7 @@ 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),
@@ -159,7 +160,7 @@ static inline void cpuid_count(int op, i
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),
@@ -174,7 +175,7 @@ static inline unsigned int cpuid_eax(uns
{
unsigned int eax;
- __asm__("cpuid"
+ __asm__(CPUID_STR
: "=a" (eax)
: "0" (op)
: "bx", "cx", "dx");
@@ -184,7 +185,7 @@ static inline unsigned int cpuid_ebx(uns
{
unsigned int eax, ebx;
- __asm__("cpuid"
+ __asm__(CPUID_STR
: "=a" (eax), "=b" (ebx)
: "0" (op)
: "cx", "dx" );
@@ -194,7 +195,7 @@ static inline unsigned int cpuid_ecx(uns
{
unsigned int eax, ecx;
- __asm__("cpuid"
+ __asm__(CPUID_STR
: "=a" (eax), "=c" (ecx)
: "0" (op)
: "bx", "dx" );
@@ -204,7 +205,7 @@ static inline unsigned int cpuid_edx(uns
{
unsigned int eax, edx;
- __asm__("cpuid"
+ __asm__(CPUID_STR
: "=a" (eax), "=d" (edx)
: "0" (op)
: "bx", "cx");
diff -r 122f3fbdb7a4 include/asm-i386/mach-default/mach_processor.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/asm-i386/mach-default/mach_processor.h Thu Jun 22 20:38:07
2006 -0400
@@ -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 */
diff -r 122f3fbdb7a4 include/asm-i386/mach-xen/mach_processor.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/asm-i386/mach-xen/mach_processor.h Thu Jun 22 20:38:07
2006 -0400
@@ -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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