From 1844c9bc0b2fed3023551c1affe033ab38e90b9a Mon Sep 17 00:00:00 2001
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Fri, 26 Feb 2010 22:37:53 +0100
Subject: [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>
---
 arch/s390/kernel/head.S | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

(limited to 'arch/s390/kernel/head.S')

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
-- 
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