[S390] add support for compressed kernels

Add the "bzImage" compile target and the necessary code  to generate
compressed kernel images. The old style uncompressed "image" target
is preserved, a simple make will build them both.

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

1 files changed, 21 insertions, 20 deletions

diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index 1fb59055c7ca..ca4a62bd862f 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -1,5 +1,5 @@
 /*
- * Copyright IBM Corp. 1999,2009
+ * Copyright IBM Corp. 1999,2010
  *
  *    Author(s): Hartmut Penner <hp@de.ibm.com>
  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
@@ -22,11 +22,9 @@
  */
 
 #include <linux/init.h>
-#include <asm/setup.h>
 #include <asm/asm-offsets.h>
 #include <asm/thread_info.h>
 #include <asm/page.h>
-#include <asm/cpu.h>
 
 #ifdef CONFIG_64BIT
 #define ARCH_OFFSET     4
@@ -450,16 +448,15 @@ start:
 # or linload or SALIPL
 #
         .org    0x10000
-startup:basr    %r13,0                  # get base
+        .globl  startup
+startup:
+        basr    %r13,0                  # get base
 .LPG0:
         xc      0x200(256),0x200        # partially clear lowcore
         xc      0x300(256),0x300
-        l       %r1,5f-.LPG0(%r13)
-        stck    0(%r1)
-        spt     6f-.LPG0(%r13)
-        mvc     __LC_LAST_UPDATE_CLOCK(8),0(%r1)
-        mvc     __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
-        mvc     __LC_EXIT_TIMER(8),5f-.LPG0(%r13)
+        stck    __LC_LAST_UPDATE_CLOCK
+        spt     5f-.LPG0(%r13)
+        mvc     __LC_LAST_UPDATE_TIMER(8),5f-.LPG0(%r13)
 #ifndef CONFIG_MARCH_G5
         # check capabilities against MARCH_{G5,Z900,Z990,Z9_109,Z10}
         xc      __LC_STFL_FAC_LIST(8),__LC_STFL_FAC_LIST
@@ -477,7 +474,6 @@ startup:basr	%r13,0			# get base
         cl      %r0,2f+12-.LPG0(%r13)
         je      3f
 1:      l       %r15,.Lstack-.LPG0(%r13)
-        ahi     %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE
         ahi     %r15,-96
         la      %r2,.Lals_string-.LPG0(%r13)
         l       %r3,.Lsclp_print-.LPG0(%r13)
@@ -488,7 +484,7 @@ startup:basr	%r13,0			# get base
 .Lsclp_print:
         .long   _sclp_print_early
 .Lstack:
-        .long   init_thread_union
+        .long   0x8000 + (1<<(PAGE_SHIFT+THREAD_ORDER))
         .align 16
 2:      .long   0x000a0000,0x8badcccc
 #if defined(CONFIG_64BIT)
@@ -515,13 +511,22 @@ startup:basr	%r13,0			# get base
 3:
 #endif
 
+#ifdef CONFIG_64BIT
+        mvi     __LC_AR_MODE_ID,1       # set esame flag
+        slr     %r0,%r0                 # set cpuid to zero
+        lhi     %r1,2                   # mode 2 = esame (dump)
+        sigp    %r1,%r0,0x12            # switch to esame mode
+        sam64                           # switch to 64 bit mode
+        jg      startup_continue
+#else
+        mvi     __LC_AR_MODE_ID,0       # set ESA flag (mode 0)
         l       %r13,4f-.LPG0(%r13)
         b       0(%r13)
-        .align  4
+        .align  8
 4:      .long   startup_continue
-5:      .long   sched_clock_base_cc
+#endif
         .align  8
-6:      .long   0x7fffffff,0xffffffff
+5:      .long   0x7fffffff,0xffffffff
 
 #
 # params at 10400 (setup.h)
@@ -535,8 +540,4 @@ startup:basr	%r13,0			# get base
         .byte   "root=/dev/ram0 ro"
         .byte   0
 
-#ifdef CONFIG_64BIT
-#include "head64.S"
-#else
-#include "head31.S"
-#endif
+        .org    0x11000