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Date: Thu, 16 Oct 2008 20:47:55 +0200 (CEST)
From: Hans Schou <linux@...ou.dk>
To: "H. Peter Anvin" <hpa@...or.com>
cc: linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH] SiS55x, another x86 CPU
On Wed, 15 Oct 2008, H. Peter Anvin wrote:
> Hans Schou wrote:
>>
>> Detected CPU flags in /proc/cpuinfo and in the datasheet:
>> flags : fpu tsc cx8 mmx
>>
>> Instruction and data cache is 8KB each it says in the datasheet. I'm not
>> sure but it does not look like it is written in dmesg.
>>
>
> Could you post /proc/cpuinfo from this machine?
Sure. Here it is with a kernel 2.6.25 - not the patch below:
processor : 0
vendor_id : SiS SiS SiS
cpu family : 5
model : 0
model name : 05/00
stepping : 5
cpu MHz : 200.008
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu tsc cx8 mmx
bogomips : 401.32
clflush size : 32
Please note that the vendor_id has a space in the end:
"SiS SiS SiS "
> P.S. Please send x86 patches to x86@...nel.org as well as LKML.
OK. I had a problem with Pine doing linewrap. I try again.
diff -Naur a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
--- a/arch/x86/Kconfig.cpu 2008-10-11 23:03:47.000000000 +0200
+++ b/arch/x86/Kconfig.cpu 2008-10-12 00:30:08.000000000 +0200
@@ -242,6 +242,13 @@
Select this for a VIA C7. Selecting this uses the correct cache
shift and tells gcc to treat the CPU as a 686.
+config MSIS55X
+ bool "SiS55x"
+ depends on X86_32
+ help
+ Select this for a SiS550/551/552 SoC. Selecting this uses the
+ correct cache shift and tells gcc to treat the CPU as a 586.
+
config MPSC
bool "Intel P4 / older Netburst based Xeon"
depends on X86_64
@@ -309,7 +316,7 @@
int
default "7" if MPENTIUM4 || X86_GENERIC || GENERIC_CPU || MPSC
default "4" if X86_ELAN || M486 || M386 || MGEODEGX1
- default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
+ default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX || MSIS55X
default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MVIAC7
config X86_XADD
@@ -351,7 +358,7 @@
config X86_ALIGNMENT_16
def_bool y
- depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
+ depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1 || MSIS55X
config X86_INTEL_USERCOPY
def_bool y
@@ -387,7 +394,7 @@
config X86_TSC
def_bool y
- depends on ((MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ) || X86_64
+ depends on ((MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MSIS55X || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ) || X86_64
config X86_CMPXCHG64
def_bool y
@@ -464,6 +471,13 @@
help
This enables extended support for UMC processors
+config CPU_SUP_SIS_32
+ default y
+ bool "Support SiS processors" if PROCESSOR_SELECT
+ depends on !64BIT
+ help
+ This enables extended support for SiS processors
+
config X86_DS
bool "Debug Store support"
default y
diff -Naur a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
--- a/arch/x86/kernel/cpu/Makefile 2008-10-11 23:03:47.000000000 +0200
+++ b/arch/x86/kernel/cpu/Makefile 2008-10-03 23:56:53.000000000 +0200
@@ -15,6 +15,7 @@
obj-$(CONFIG_CPU_SUP_CENTAUR_64) += centaur_64.o
obj-$(CONFIG_CPU_SUP_TRANSMETA_32) += transmeta.o
obj-$(CONFIG_CPU_SUP_UMC_32) += umc.o
+obj-$(CONFIG_CPU_SUP_SIS_32) += sis.o
obj-$(CONFIG_X86_MCE) += mcheck/
obj-$(CONFIG_MTRR) += mtrr/
diff -Naur a/arch/x86/kernel/cpu/sis.c b/arch/x86/kernel/cpu/sis.c
--- a/arch/x86/kernel/cpu/sis.c 1970-01-01 01:00:00.000000000 +0100
+++ b/arch/x86/kernel/cpu/sis.c 2008-10-11 11:04:23.000000000 +0200
@@ -0,0 +1,25 @@
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <asm/processor.h>
+#include "cpu.h"
+
+static unsigned int __cpuinit sis_size_cache(struct cpuinfo_x86 *c, unsigned int size)
+{
+ return 8;
+}
+
+static struct cpu_dev sis_cpu_dev __cpuinitdata = {
+ .c_vendor = "SiS",
+ .c_ident = { "SiS SiS SiS " },
+ .c_models = {
+ { .vendor = X86_VENDOR_SIS, .family = 5, .model_names =
+ {
+ [0] = "SiS55x",
+ }
+ },
+ },
+ .c_size_cache = sis_size_cache,
+ .c_x86_vendor = X86_VENDOR_SIS,
+};
+
+cpu_dev_register(sis_cpu_dev);
diff -Naur a/include/asm-x86/processor.h b/include/asm-x86/processor.h
--- a/include/asm-x86/processor.h 2008-10-11 23:03:47.000000000 +0200
+++ b/include/asm-x86/processor.h 2008-10-03 23:53:00.000000000 +0200
@@ -119,7 +119,8 @@
#define X86_VENDOR_CENTAUR 5
#define X86_VENDOR_TRANSMETA 7
#define X86_VENDOR_NSC 8
-#define X86_VENDOR_NUM 9
+#define X86_VENDOR_SIS 9
+#define X86_VENDOR_NUM 10
#define X86_VENDOR_UNKNOWN 0xff
--
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