linux-kernel - Re: [PATCH] [resend] Add support for Rise mP6 CPUs

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Date:	Sun, 18 Mar 2012 17:08:34 +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: Re: [PATCH] [resend] Add support for Rise mP6 CPUs

On Saturday 17 March 2012 18:16:53 H. Peter Anvin wrote:
> Did Rise ever ship any production parts?

AFAIK, the Kirin CPUs (PR166-PR266) were mass produced. You can get them on 
eBay (mostly PR266).

> Ondrej Zary <linux@...nbow-software.org> wrote:
> >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


-- 
Ondrej Zary
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