[S390] Add processor type march=z10 and a processor type safety check.

This patch adds the code generation option for IBM System z10 and
adds a check in head[31,64].S to prevents the execution of a kernel
compiled for a new processor type on an old machine.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index 83477c7dc743..ec7e35f6055b 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -461,6 +461,55 @@ start:
         .byte 0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7
         .byte 0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff
 
+#
+# startup-code at 0x10000, running in absolute addressing mode
+# this is called either by the ipl loader or directly by PSW restart
+# or linload or SALIPL
+#
+        .org    0x10000
+startup:basr    %r13,0                  # get base
+.LPG0:
+
+#ifndef CONFIG_MARCH_G5
+        # check processor version against MARCH_{G5,Z900,Z990,Z9_109,Z10}
+        stidp   __LC_CPUID              # store cpuid
+        lhi     %r0,(3f-2f) / 2
+        la      %r1,2f-.LPG0(%r13)
+0:      clc     __LC_CPUID+4(2),0(%r1)
+        jne     3f
+        lpsw    1f-.LPG0(13)            # machine type not good enough, crash
+        .align 16
+1:      .long   0x000a0000,0x00000000
+2:
+#if defined(CONFIG_MARCH_Z10)
+        .short 0x9672, 0x2064, 0x2066, 0x2084, 0x2086, 0x2094, 0x2096
+#elif defined(CONFIG_MARCH_Z9_109)
+        .short 0x9672, 0x2064, 0x2066, 0x2084, 0x2086
+#elif defined(CONFIG_MARCH_Z990)
+        .short 0x9672, 0x2064, 0x2066
+#elif defined(CONFIG_MARCH_Z900)
+        .short 0x9672
+#endif
+3:      la      %r1,2(%r1)
+        brct    %r0,0b
+#endif
+
+        l       %r13,0f-.LPG0(%r13)
+        b       0(%r13)
+0:      .long   startup_continue
+
+#
+# params at 10400 (setup.h)
+#
+        .org    PARMAREA
+        .long   0,0                     # IPL_DEVICE
+        .long   0,0                     # INITRD_START
+        .long   0,0                     # INITRD_SIZE
+
+        .org    COMMAND_LINE
+        .byte   "root=/dev/ram0 ro"
+        .byte   0
+
 #ifdef CONFIG_64BIT
 #include "head64.S"
 #else