[PATCH] VIA C3 Nehemiah support.

The new C3s won't boot a C3 kernel as they dropped 3dnow support in
favour of SSE.  It now also has cmov though and can be scheduled as a
686 CPU.

I've a patch for gcc pending inclusion that adds the -march=c3-2 option.

arch/i386/Kconfig

@@ -136,6 +136,7 @@ config M386
 	  - "Winchip-2" for IDT Winchip 2.
 	  - "Winchip-2A" for IDT Winchips with 3dNow! capabilities.
 	  - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
+	  - "VIA C3-2 for VIA C3-2 "Nehemiah" (model 9 and above).
 
 	  If you don't know what to do, choose "386".
 
@@ -260,6 +261,16 @@ config MCYRIXIII
 	  treat this chip as a generic 586. Whilst the CPU is 686 class,
 	  it lacks the cmov extension which gcc assumes is present when
 	  generating 686 code.
+	  Note, that Nehemiah (Model 9) and above will not boot with this
+	  kernel due to them lacking the 3dnow instructions used in earlier
+	  incarnations of the CPU.
+
+config MVIAC3_2
+	bool "VIA C3-2 (Nehemiah)"
+	help
+	  Select this for a VIA C3 "Nehemiah". Selecting this enables usage of SSE
+	  and tells gcc to treat the CPU as a 686.
+	  Note, this kernel will not boot on older (pre model 9) C3s.
 
 endchoice
 
@@ -278,8 +289,8 @@ config X86_XADD
 
 config X86_L1_CACHE_SHIFT
 	int
-	default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586
 	default "4" if MELAN || M486 || M386
+	default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2
 	default "6" if MK7 || MK8
 	default "7" if MPENTIUM4
 
@@ -325,12 +336,12 @@ config X86_POPAD_OK
 
 config X86_ALIGNMENT_16
 	bool
-	depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486
+	depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2
 	default y
 
 config X86_TSC
 	bool
-	depends on MWINCHIP3D || MWINCHIP2 || MCRUSOE || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8
+	depends on MWINCHIP3D || MWINCHIP2 || MCRUSOE || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2
 	default y
 
 config X86_GOOD_APIC
@@ -345,7 +356,7 @@ config X86_INTEL_USERCOPY
 
 config X86_USE_PPRO_CHECKSUM
 	bool
-	depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMIII || MPENTIUMII || M686 || MK8
+	depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2
 	default y
 
 config X86_USE_3DNOW
@@ -360,7 +371,7 @@ config X86_OOSTORE
 
 config X86_PREFETCH
 	bool
-	depends on MPENTIUMIII || MPENTIUM4
+	depends on MPENTIUMIII || MPENTIUM4 || MVIAC3_2
 	default y
 
 config X86_SSE2

arch/i386/Makefile

@@ -46,6 +46,7 @@ cflags-$(CONFIG_MWINCHIP3D)	+= -march=i586
 cflags-$(CONFIG_MCYRIXIII)	+= $(call check_gcc,-march=c3,-march=i486)
 # The alignment flags change with gcc 3.2
 cflags-$(CONFIG_MCYRIXIII)	+= $(call check_gcc,-falign-functions=0 -falign-jumps=0 -falign-loops=0,-malign-functions=0 -malign-jumps=0 -malign-loops=0)
+cflags-$(CONFIG_MVIAC3_2)	+= $(call check_gcc,-march=c3-2,-march=i686)
 
 CFLAGS += $(cflags-y)
 

arch/i386/kernel/cpu/centaur.c

@@ -395,6 +395,8 @@ static void __init init_centaur(struct cpuinfo_x86 *c)
 					set_bit(X86_FEATURE_CX8, c->x86_capability);
 					set_bit(X86_FEATURE_3DNOW, c->x86_capability);
 
+				case 9:	/* Nehemiah */
+				default:
 					get_model_name(c);
 					display_cacheinfo(c);
 					break;

include/asm-i386/module.h

@@ -46,6 +46,8 @@ struct mod_arch_specific
 #define MODULE_PROC_FAMILY "WINCHIP3D "
 #elif CONFIG_MCYRIXIII
 #define MODULE_PROC_FAMILY "CYRIXIII "
+#elif CONFIG_MVIAC3_2
+#define MODULE_PROC_FAMILY "VIAC3-2 "
 #else
 #error unknown processor family
 #endif