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review.evervolv.com / android_kernel_htc_msm8960 / e37f50e1811d68170e4d58a087cf634b2bf1cef9 / . / arch / s390 / kernel / head31.S
blob: 7add8454773b3218ecb049a6253497261c0b23ee [file] [log] [blame]
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]1/*
2 * arch/s390/kernel/head31.S
3 *
Heiko Carstensb1b70302006-06-29 14:58:17 +0200[diff] [blame]4 * Copyright (C) IBM Corp. 2005,2006
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]5 *
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
Heiko Carstensb1b70302006-06-29 14:58:17 +0200[diff] [blame]13 .org 0x11000
14
15startup_continue:
16 basr %r13,0 # get base
Martin Schwidefskye37f50e2008-12-25 13:39:19 +0100[diff] [blame^]17.LPG1:
18
19 mvi __LC_AR_MODE_ID,0 # set ESA flag (mode 0)
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]20 lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
Heiko Carstensb1b70302006-06-29 14:58:17 +0200[diff] [blame]21 l %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
22 # move IPL device to lowcore
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]23 mvc __LC_IPLDEV(4),IPL_DEVICE-PARMAREA(%r12)
Heiko Carstense87bfe52006-09-20 15:59:15 +0200[diff] [blame]24#
25# Setup stack
26#
27 l %r15,.Linittu-.LPG1(%r13)
28 mvc __LC_CURRENT(4),__TI_task(%r15)
29 ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE
30 st %r15,__LC_KERNEL_STACK # set end of kernel stack
31 ahi %r15,-96
32 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
Hongjie Yangfe355b72007-02-05 21:18:24 +0100[diff] [blame]33#
34# Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
35# and create a kernel NSS if the SAVESYS= parm is defined
36#
37 l %r14,.Lstartup_init-.LPG1(%r13)
Heiko Carstense87bfe52006-09-20 15:59:15 +0200[diff] [blame]38 basr %r14,%r14
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]39 lpsw .Lentry-.LPG1(13) # jump to _stext in primary-space,
40 # virtual and never return ...
41 .align 8
42.Lentry:.long 0x00080000,0x80000000 + _stext
43.Lctl: .long 0x04b50002 # cr0: various things
44 .long 0 # cr1: primary space segment table
45 .long .Lduct # cr2: dispatchable unit control table
46 .long 0 # cr3: instruction authorization
47 .long 0 # cr4: instruction authorization
Gerald Schaefer482b05d2007-03-05 23:35:54 +0100[diff] [blame]48 .long .Lduct # cr5: primary-aste origin
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]49 .long 0 # cr6: I/O interrupts
50 .long 0 # cr7: secondary space segment table
51 .long 0 # cr8: access registers translation
52 .long 0 # cr9: tracing off
53 .long 0 # cr10: tracing off
54 .long 0 # cr11: tracing off
55 .long 0 # cr12: tracing off
56 .long 0 # cr13: home space segment table
57 .long 0xc0000000 # cr14: machine check handling off
58 .long 0 # cr15: linkage stack operations
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]59.Lmchunk:.long memory_chunk
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]60.Lbss_bgn: .long __bss_start
61.Lbss_end: .long _end
Heiko Carstensb1b70302006-06-29 14:58:17 +0200[diff] [blame]62.Lparmaddr: .long PARMAREA
Heiko Carstensab14de62007-02-05 21:18:37 +0100[diff] [blame]63.Linittu: .long init_thread_union
64.Lstartup_init:
65 .long startup_init
Gerald Schaefer482b05d2007-03-05 23:35:54 +0100[diff] [blame]66 .align 64
67.Lduct: .long 0,0,0,0,.Lduald,0,0,0
68 .long 0,0,0,0,0,0,0,0
69 .align 128
70.Lduald:.rept 8
71 .long 0x80000000,0,0,0 # invalid access-list entries
72 .endr
Heiko Carstense87bfe52006-09-20 15:59:15 +0200[diff] [blame]73
Heiko Carstensdc8f5d22006-07-18 13:44:57 +0200[diff] [blame]74 .org 0x12000
Heiko Carstens615b04b2007-02-21 10:55:37 +0100[diff] [blame]75 .globl _ehead
76_ehead:
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]77#ifdef CONFIG_SHARED_KERNEL
78 .org 0x100000
79#endif
80
81#
Heiko Carstensb1b70302006-06-29 14:58:17 +0200[diff] [blame]82# startup-code, running in absolute addressing mode
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]83#
84 .globl _stext
85_stext: basr %r13,0 # get base
86.LPG3:
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]87# check control registers
88 stctl %c0,%c15,0(%r15)
89 oi 2(%r15),0x40 # enable sigp emergency signal
90 oi 0(%r15),0x10 # switch on low address protection
91 lctl %c0,%c15,0(%r15)
92
93#
94 lam 0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
95 l %r14,.Lstart-.LPG3(%r13)
96 basr %r14,%r14 # call start_kernel
97#
98# We returned from start_kernel ?!? PANIK
99#
100 basr %r13,0
101 lpsw .Ldw-.(%r13) # load disabled wait psw
102#
103 .align 8
104.Ldw: .long 0x000a0000,0x00000000
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]105.Lstart:.long start_kernel
106.Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0