s390: add z13 code generation support

Allow to generate code that only runs on z13 machines.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/Kconfig

@@ -185,6 +185,10 @@ config HAVE_MARCH_ZEC12_FEATURES
 	def_bool n
 	select HAVE_MARCH_Z196_FEATURES
 
+config HAVE_MARCH_Z13_FEATURES
+	def_bool n
+	select HAVE_MARCH_ZEC12_FEATURES
+
 choice
 	prompt "Processor type"
 	default MARCH_G5
@@ -244,6 +248,14 @@ config MARCH_ZEC12
 	  2827 series). The kernel will be slightly faster but will not work on
 	  older machines.
 
+config MARCH_Z13
+	bool "IBM z13"
+	select HAVE_MARCH_Z13_FEATURES if 64BIT
+	help
+	  Select this to enable optimizations for IBM z13 (2964 series).
+	  The kernel will be slightly faster but will not work on older
+	  machines.
+
 endchoice
 
 config MARCH_G5_TUNE
@@ -267,6 +279,9 @@ config MARCH_Z196_TUNE
 config MARCH_ZEC12_TUNE
 	def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 
+config MARCH_Z13_TUNE
+	def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
+
 choice
 	prompt "Tune code generation"
 	default TUNE_DEFAULT
@@ -305,6 +320,9 @@ config TUNE_Z196
 config TUNE_ZEC12
 	bool "IBM zBC12 and zEC12"
 
+config TUNE_Z13
+	bool "IBM z13"
+
 endchoice
 
 config 64BIT

arch/s390/Makefile

@@ -42,6 +42,7 @@ mflags-$(CONFIG_MARCH_Z9_109) := -march=z9-109
 mflags-$(CONFIG_MARCH_Z10)    := -march=z10
 mflags-$(CONFIG_MARCH_Z196)   := -march=z196
 mflags-$(CONFIG_MARCH_ZEC12)  := -march=zEC12
+mflags-$(CONFIG_MARCH_Z13)   := -march=z13
 
 aflags-y += $(mflags-y)
 cflags-y += $(mflags-y)
@@ -53,6 +54,7 @@ cflags-$(CONFIG_MARCH_Z9_109_TUNE)	+= -mtune=z9-109
 cflags-$(CONFIG_MARCH_Z10_TUNE)		+= -mtune=z10
 cflags-$(CONFIG_MARCH_Z196_TUNE)	+= -mtune=z196
 cflags-$(CONFIG_MARCH_ZEC12_TUNE)	+= -mtune=zEC12
+cflags-$(CONFIG_MARCH_Z13_TUNE)	+= -mtune=z13
 
 #KBUILD_IMAGE is necessary for make rpm
 KBUILD_IMAGE	:=arch/s390/boot/image

arch/s390/kernel/head.S

@@ -436,7 +436,9 @@ ENTRY(startup_kdump)
 # followed by the facility words.
 
 #if defined(CONFIG_64BIT)
-#if defined(CONFIG_MARCH_ZEC12)
+#if defined(CONFIG_MARCH_Z13)
+	.long 3, 0xc100eff2, 0xf46ce800, 0x00400000
+#elif defined(CONFIG_MARCH_ZEC12)
 	.long 3, 0xc100eff2, 0xf46ce800, 0x00400000
 #elif defined(CONFIG_MARCH_Z196)
 	.long 2, 0xc100eff2, 0xf46c0000

arch/s390/kernel/setup.c

@@ -810,6 +810,9 @@ static void __init setup_hwcaps(void)
 	case 0x2828:
 		strcpy(elf_platform, "zEC12");
 		break;
+	case 0x2964:
+		strcpy(elf_platform, "z13");
+		break;
 	}
 }