[S390] use facility list for cpu type safety check

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

2 files changed, 35 insertions, 15 deletions

diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index 3aeca492b147..713fe9fb1fcc 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -30,6 +30,7 @@
 #define __LC_SUBCHANNEL_NR              0x00ba
 #define __LC_IO_INT_PARM                0x00bc
 #define __LC_IO_INT_WORD                0x00c0
+#define __LC_STFL_FAC_LIST              0x00c8
 #define __LC_MCCK_CODE                  0x00e8
 
 #define __LC_DUMP_REIPL                 0x0e00
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index 22596d70fc2e..bf8cf1caeffc 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -479,27 +479,46 @@ startup:basr	%r13,0			# get base
         mvc     __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
         mvc     __LC_EXIT_TIMER(8),5f-.LPG0(%r13)
 #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
+        # check capabilities against MARCH_{G5,Z900,Z990,Z9_109,Z10}
+        xc      __LC_STFL_FAC_LIST(8),__LC_STFL_FAC_LIST
+        stfl    __LC_STFL_FAC_LIST      # store facility list
+        tm      __LC_STFL_FAC_LIST,0x01 # stfle available ?
+        jz      0f
+        la      %r0,0
+        .insn   s,0xb2b00000,__LC_STFL_FAC_LIST # store facility list extended
+0:      l       %r0,__LC_STFL_FAC_LIST
+        n       %r0,2f+8-.LPG0(%r13)
+        cl      %r0,2f+8-.LPG0(%r13)
+        jne     1f
+        l       %r0,__LC_STFL_FAC_LIST+4
+        n       %r0,2f+12-.LPG0(%r13)
+        cl      %r0,2f+12-.LPG0(%r13)
+        je      3f
+1:      lpsw    2f-.LPG0(13)            # machine type not good enough, crash
         .align 16
-1:      .long   0x000a0000,0x00000000
-2:
+2:      .long   0x000a0000,0x8badcccc
+#if defined(CONFIG_64BIT)
+#if defined(CONFIG_MARCH_Z10)
+        .long 0xc100efe3, 0xf0680000
+#elif defined(CONFIG_MARCH_Z9_109)
+        .long 0xc100efc3, 0x00000000
+#elif defined(CONFIG_MARCH_Z990)
+        .long 0xc0002000, 0x00000000
+#elif defined(CONFIG_MARCH_Z900)
+        .long 0xc0000000, 0x00000000
+#endif
+#else
 #if defined(CONFIG_MARCH_Z10)
-        .short 0x9672, 0x2064, 0x2066, 0x2084, 0x2086, 0x2094, 0x2096
+        .long 0x8100c880, 0x00000000
 #elif defined(CONFIG_MARCH_Z9_109)
-        .short 0x9672, 0x2064, 0x2066, 0x2084, 0x2086
+        .long 0x8100c880, 0x00000000
 #elif defined(CONFIG_MARCH_Z990)
-        .short 0x9672, 0x2064, 0x2066
+        .long 0x80002000, 0x00000000
 #elif defined(CONFIG_MARCH_Z900)
-        .short 0x9672
+        .long 0x80000000, 0x00000000
+#endif
 #endif
-3:      la      %r1,2(%r1)
-        brct    %r0,0b
+3:
 #endif
 
         l       %r13,4f-.LPG0(%r13)