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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/s390/kernel/head31.S
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/s390/kernel/head31.S')
-rw-r--r--arch/s390/kernel/head31.S112
1 files changed, 112 insertions, 0 deletions
diff --git a/arch/s390/kernel/head31.S b/arch/s390/kernel/head31.S
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+/*
+ * arch/s390/kernel/head31.S
+ *
+ * Copyright (C) IBM Corp. 2005,2010
+ *
+ * Author(s): Hartmut Penner <hp@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Rob van der Heij <rvdhei@iae.nl>
+ * Heiko Carstens <heiko.carstens@de.ibm.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+#include <asm/page.h>
+
+__HEAD
+ENTRY(startup_continue)
+ basr %r13,0 # get base
+.LPG1:
+
+ l %r1,.Lbase_cc-.LPG1(%r13)
+ mvc 0(8,%r1),__LC_LAST_UPDATE_CLOCK
+ lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
+ l %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
+ # move IPL device to lowcore
+#
+# Setup stack
+#
+ l %r15,.Linittu-.LPG1(%r13)
+ st %r15,__LC_THREAD_INFO # cache thread info in lowcore
+ mvc __LC_CURRENT(4),__TI_task(%r15)
+ ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE
+ st %r15,__LC_KERNEL_STACK # set end of kernel stack
+ ahi %r15,-96
+#
+# Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
+# and create a kernel NSS if the SAVESYS= parm is defined
+#
+ l %r14,.Lstartup_init-.LPG1(%r13)
+ basr %r14,%r14
+ lpsw .Lentry-.LPG1(13) # jump to _stext in primary-space,
+ # virtual and never return ...
+ .align 8
+.Lentry:.long 0x00080000,0x80000000 + _stext
+.Lctl: .long 0x04b50000 # cr0: various things
+ .long 0 # cr1: primary space segment table
+ .long .Lduct # cr2: dispatchable unit control table
+ .long 0 # cr3: instruction authorization
+ .long 0 # cr4: instruction authorization
+ .long .Lduct # cr5: primary-aste origin
+ .long 0 # cr6: I/O interrupts
+ .long 0 # cr7: secondary space segment table
+ .long 0 # cr8: access registers translation
+ .long 0 # cr9: tracing off
+ .long 0 # cr10: tracing off
+ .long 0 # cr11: tracing off
+ .long 0 # cr12: tracing off
+ .long 0 # cr13: home space segment table
+ .long 0xc0000000 # cr14: machine check handling off
+ .long 0 # cr15: linkage stack operations
+.Lmchunk:.long memory_chunk
+.Lbss_bgn: .long __bss_start
+.Lbss_end: .long _end
+.Lparmaddr: .long PARMAREA
+.Linittu: .long init_thread_union
+.Lstartup_init:
+ .long startup_init
+ .align 64
+.Lduct: .long 0,0,0,0,.Lduald,0,0,0
+ .long 0,0,0,0,0,0,0,0
+ .align 128
+.Lduald:.rept 8
+ .long 0x80000000,0,0,0 # invalid access-list entries
+ .endr
+.Lbase_cc:
+ .long sched_clock_base_cc
+
+ENTRY(_ehead)
+
+#ifdef CONFIG_SHARED_KERNEL
+ .org 0x100000 - 0x11000 # head.o ends at 0x11000
+#endif
+
+#
+# startup-code, running in absolute addressing mode
+#
+ENTRY(_stext)
+ basr %r13,0 # get base
+.LPG3:
+# check control registers
+ stctl %c0,%c15,0(%r15)
+ oi 2(%r15),0x60 # enable sigp emergency & external call
+ oi 0(%r15),0x10 # switch on low address protection
+ lctl %c0,%c15,0(%r15)
+
+#
+ lam 0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
+ l %r14,.Lstart-.LPG3(%r13)
+ basr %r14,%r14 # call start_kernel
+#
+# We returned from start_kernel ?!? PANIK
+#
+ basr %r13,0
+ lpsw .Ldw-.(%r13) # load disabled wait psw
+#
+ .align 8
+.Ldw: .long 0x000a0000,0x00000000
+.Lstart:.long start_kernel
+.Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0