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Heiko Carstens0ad775d2005-11-07 00:59:12 -08001/*
2 * arch/s390/kernel/head31.S
3 *
Martin Schwidefsky1844c9b2010-02-26 22:37:53 +01004 * Copyright (C) IBM Corp. 2005,2010
Heiko Carstens0ad775d2005-11-07 00:59:12 -08005 *
6 * Author(s): Hartmut Penner <hp@de.ibm.com>
7 * Martin Schwidefsky <schwidefsky@de.ibm.com>
8 * Rob van der Heij <rvdhei@iae.nl>
9 * Heiko Carstens <heiko.carstens@de.ibm.com>
10 *
11 */
12
Martin Schwidefsky1844c9b2010-02-26 22:37:53 +010013#include <linux/init.h>
Jan Glauber144d6342011-07-24 10:48:19 +020014#include <linux/linkage.h>
Martin Schwidefsky1844c9b2010-02-26 22:37:53 +010015#include <asm/asm-offsets.h>
16#include <asm/thread_info.h>
17#include <asm/page.h>
Heiko Carstensb1b70302006-06-29 14:58:17 +020018
Martin Schwidefsky1844c9b2010-02-26 22:37:53 +010019__HEAD
Jan Glauber144d6342011-07-24 10:48:19 +020020ENTRY(startup_continue)
Heiko Carstensb1b70302006-06-29 14:58:17 +020021 basr %r13,0 # get base
Martin Schwidefskye37f50e2008-12-25 13:39:19 +010022.LPG1:
23
Martin Schwidefsky1844c9b2010-02-26 22:37:53 +010024 l %r1,.Lbase_cc-.LPG1(%r13)
25 mvc 0(8,%r1),__LC_LAST_UPDATE_CLOCK
Heiko Carstens0ad775d2005-11-07 00:59:12 -080026 lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
Heiko Carstensb1b70302006-06-29 14:58:17 +020027 l %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
28 # move IPL device to lowcore
Heiko Carstense87bfe52006-09-20 15:59:15 +020029#
30# Setup stack
31#
32 l %r15,.Linittu-.LPG1(%r13)
Heiko Carstens0c88ee52009-09-11 10:28:58 +020033 st %r15,__LC_THREAD_INFO # cache thread info in lowcore
Heiko Carstense87bfe52006-09-20 15:59:15 +020034 mvc __LC_CURRENT(4),__TI_task(%r15)
35 ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE
36 st %r15,__LC_KERNEL_STACK # set end of kernel stack
37 ahi %r15,-96
Hongjie Yangfe355b72007-02-05 21:18:24 +010038#
39# Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
40# and create a kernel NSS if the SAVESYS= parm is defined
41#
42 l %r14,.Lstartup_init-.LPG1(%r13)
Heiko Carstense87bfe52006-09-20 15:59:15 +020043 basr %r14,%r14
Heiko Carstens0ad775d2005-11-07 00:59:12 -080044 lpsw .Lentry-.LPG1(13) # jump to _stext in primary-space,
45 # virtual and never return ...
46 .align 8
47.Lentry:.long 0x00080000,0x80000000 + _stext
Martin Schwidefsky5beab992011-07-24 10:48:28 +020048.Lctl: .long 0x04b50000 # cr0: various things
Heiko Carstens0ad775d2005-11-07 00:59:12 -080049 .long 0 # cr1: primary space segment table
50 .long .Lduct # cr2: dispatchable unit control table
51 .long 0 # cr3: instruction authorization
52 .long 0 # cr4: instruction authorization
Gerald Schaefer482b05d2007-03-05 23:35:54 +010053 .long .Lduct # cr5: primary-aste origin
Heiko Carstens0ad775d2005-11-07 00:59:12 -080054 .long 0 # cr6: I/O interrupts
55 .long 0 # cr7: secondary space segment table
56 .long 0 # cr8: access registers translation
57 .long 0 # cr9: tracing off
58 .long 0 # cr10: tracing off
59 .long 0 # cr11: tracing off
60 .long 0 # cr12: tracing off
61 .long 0 # cr13: home space segment table
62 .long 0xc0000000 # cr14: machine check handling off
63 .long 0 # cr15: linkage stack operations
Heiko Carstens0ad775d2005-11-07 00:59:12 -080064.Lmchunk:.long memory_chunk
Heiko Carstens0ad775d2005-11-07 00:59:12 -080065.Lbss_bgn: .long __bss_start
66.Lbss_end: .long _end
Heiko Carstensb1b70302006-06-29 14:58:17 +020067.Lparmaddr: .long PARMAREA
Heiko Carstensab14de62007-02-05 21:18:37 +010068.Linittu: .long init_thread_union
69.Lstartup_init:
70 .long startup_init
Gerald Schaefer482b05d2007-03-05 23:35:54 +010071 .align 64
72.Lduct: .long 0,0,0,0,.Lduald,0,0,0
73 .long 0,0,0,0,0,0,0,0
74 .align 128
75.Lduald:.rept 8
76 .long 0x80000000,0,0,0 # invalid access-list entries
77 .endr
Martin Schwidefsky1844c9b2010-02-26 22:37:53 +010078.Lbase_cc:
79 .long sched_clock_base_cc
Heiko Carstense87bfe52006-09-20 15:59:15 +020080
Jan Glauber144d6342011-07-24 10:48:19 +020081ENTRY(_ehead)
Martin Schwidefsky1844c9b2010-02-26 22:37:53 +010082
Heiko Carstens0ad775d2005-11-07 00:59:12 -080083#ifdef CONFIG_SHARED_KERNEL
Martin Schwidefsky57d84902010-05-12 09:32:13 +020084 .org 0x100000 - 0x11000 # head.o ends at 0x11000
Heiko Carstens0ad775d2005-11-07 00:59:12 -080085#endif
86
87#
Heiko Carstensb1b70302006-06-29 14:58:17 +020088# startup-code, running in absolute addressing mode
Heiko Carstens0ad775d2005-11-07 00:59:12 -080089#
Jan Glauber144d6342011-07-24 10:48:19 +020090ENTRY(_stext)
91 basr %r13,0 # get base
Heiko Carstens0ad775d2005-11-07 00:59:12 -080092.LPG3:
Heiko Carstens0ad775d2005-11-07 00:59:12 -080093# check control registers
94 stctl %c0,%c15,0(%r15)
95 oi 2(%r15),0x40 # enable sigp emergency signal
96 oi 0(%r15),0x10 # switch on low address protection
97 lctl %c0,%c15,0(%r15)
98
99#
100 lam 0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
101 l %r14,.Lstart-.LPG3(%r13)
102 basr %r14,%r14 # call start_kernel
103#
104# We returned from start_kernel ?!? PANIK
105#
106 basr %r13,0
107 lpsw .Ldw-.(%r13) # load disabled wait psw
108#
109 .align 8
110.Ldw: .long 0x000a0000,0x00000000
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800111.Lstart:.long start_kernel
112.Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0