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Message-Id: <201203111336.38346.linux@rainbow-software.org>
Date: Sun, 11 Mar 2012 13:36:35 +0100
From: Ondrej Zary <linux@...nbow-software.org>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Kernel development list <linux-kernel@...r.kernel.org>
Subject: [PATCH] Add support for Rise mP6 CPUs
Add detection for Rise mP6 x86 CPUs and a quirk to mark CMPXCHG8B as present.
Result:
$ cat /proc/cpuinfo
processor : 0
vendor_id : RiseRiseRise
cpu family : 5
model : 0
model name : mP6 (Kirin)
stepping : 4
cpu MHz : 200.443
cache size : 16 KB
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 up
bogomips : 400.88
clflush size : 32
cache_alignment : 32
address sizes : 32 bits physical, 32 bits virtual
power management:
Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 3c57033..5a356f3 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -505,3 +505,12 @@ config CPU_SUP_UMC_32
CPU might render the kernel unbootable.
If unsure, say N.
+
+config CPU_SUP_RISE_32
+ default y
+ bool "Support Rise processors" if PROCESSOR_SELECT
+ depends on !64BIT
+ ---help---
+ This enables detection, tunings and quirks for Rise processors
+
+ If unsure, say N.
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index aa9088c..e3a4e7f 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -119,7 +119,8 @@ struct cpuinfo_x86 {
#define X86_VENDOR_CENTAUR 5
#define X86_VENDOR_TRANSMETA 7
#define X86_VENDOR_NSC 8
-#define X86_VENDOR_NUM 9
+#define X86_VENDOR_RISE 9
+#define X86_VENDOR_NUM 10
#define X86_VENDOR_UNKNOWN 0xff
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 25f24dc..1013eb6 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_CPU_SUP_CYRIX_32) += cyrix.o
obj-$(CONFIG_CPU_SUP_CENTAUR) += centaur.o
obj-$(CONFIG_CPU_SUP_TRANSMETA_32) += transmeta.o
obj-$(CONFIG_CPU_SUP_UMC_32) += umc.o
+obj-$(CONFIG_CPU_SUP_RISE_32) += rise.o
obj-$(CONFIG_PERF_EVENTS) += perf_event.o
diff --git a/arch/x86/kernel/cpu/rise.c b/arch/x86/kernel/cpu/rise.c
new file mode 100644
index 0000000..2072a0f
--- /dev/null
+++ b/arch/x86/kernel/cpu/rise.c
@@ -0,0 +1,34 @@
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <asm/processor.h>
+#include "cpu.h"
+
+static void __cpuinit init_rise(struct cpuinfo_x86 *c)
+{
+ /*
+ * Datasheet says:
+ * The CMPXCHG8B instruction is supported and always enabled on the
+ * Rise mP6 processor; however, the default CPUID function bit is set
+ * to 0 to circumvent a reported bug in Windows NT.
+ */
+ set_cpu_cap(c, X86_FEATURE_CX8);
+ /* cache is always 16KB (8KB code + 8KB data) */
+ c->x86_cache_size = 16;
+}
+
+static const struct cpu_dev __cpuinitconst rise_cpu_dev = {
+ .c_vendor = "Rise",
+ .c_ident = { "RiseRiseRise" },
+ .c_models = {
+ { .vendor = X86_VENDOR_RISE, .family = 5, .model_names =
+ {
+ [0] = "mP6 (Kirin)",
+ [2] = "mP6 (Lynx)",
+ }
+ },
+ },
+ .c_init = init_rise,
+ .c_x86_vendor = X86_VENDOR_RISE,
+};
+
+cpu_dev_register(rise_cpu_dev);
--
Ondrej Zary
--
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