Gitiles
Code Review Sign In
review.evervolv.com / android_kernel_oneplus_msm8996 / acf99433d98c2570a619d8fb8b51abce4e532059 / . / arch / s390 / kernel / head31.S
blob: a816e2de32b957ce24af24a2e0f45163e3d8e4da [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
13#
14# startup-code at 0x10000, running in absolute addressing mode
15# this is called either by the ipl loader or directly by PSW restart
16# or linload or SALIPL
17#
18 .org 0x10000
Heiko Carstensb1b70302006-06-29 14:58:17 +0200[diff] [blame]19startup:basr %r13,0 # get base
20.LPG0: l %r13,0f-.LPG0(%r13)
21 b 0(%r13)
220: .long startup_continue
23
24#
25# params at 10400 (setup.h)
26#
27 .org PARMAREA
28 .long 0,0 # IPL_DEVICE
Heiko Carstens65912a82006-09-20 15:58:41 +0200[diff] [blame]29 .long 0,0 # INITRD_START
30 .long 0,0 # INITRD_SIZE
Heiko Carstensb1b70302006-06-29 14:58:17 +0200[diff] [blame]31
32 .org COMMAND_LINE
33 .byte "root=/dev/ram0 ro"
34 .byte 0
35
36 .org 0x11000
37
38startup_continue:
39 basr %r13,0 # get base
Heiko Carstense87bfe52006-09-20 15:59:15 +0200[diff] [blame]40.LPG1: mvi __LC_AR_MODE_ID,0 # set ESA flag (mode 0)
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]41 lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
Heiko Carstensb1b70302006-06-29 14:58:17 +0200[diff] [blame]42 l %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
43 # move IPL device to lowcore
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]44 mvc __LC_IPLDEV(4),IPL_DEVICE-PARMAREA(%r12)
Heiko Carstense87bfe52006-09-20 15:59:15 +0200[diff] [blame]45#
46# Setup stack
47#
48 l %r15,.Linittu-.LPG1(%r13)
49 mvc __LC_CURRENT(4),__TI_task(%r15)
50 ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE
51 st %r15,__LC_KERNEL_STACK # set end of kernel stack
52 ahi %r15,-96
53 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
Hongjie Yangfe355b72007-02-05 21:18:24 +0100[diff] [blame]54#
55# Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
56# and create a kernel NSS if the SAVESYS= parm is defined
57#
58 l %r14,.Lstartup_init-.LPG1(%r13)
Heiko Carstense87bfe52006-09-20 15:59:15 +0200[diff] [blame]59 basr %r14,%r14
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]60 lpsw .Lentry-.LPG1(13) # jump to _stext in primary-space,
61 # virtual and never return ...
62 .align 8
63.Lentry:.long 0x00080000,0x80000000 + _stext
64.Lctl: .long 0x04b50002 # cr0: various things
65 .long 0 # cr1: primary space segment table
66 .long .Lduct # cr2: dispatchable unit control table
67 .long 0 # cr3: instruction authorization
68 .long 0 # cr4: instruction authorization
Gerald Schaefer482b05d2007-03-05 23:35:54 +0100[diff] [blame]69 .long .Lduct # cr5: primary-aste origin
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]70 .long 0 # cr6: I/O interrupts
71 .long 0 # cr7: secondary space segment table
72 .long 0 # cr8: access registers translation
73 .long 0 # cr9: tracing off
74 .long 0 # cr10: tracing off
75 .long 0 # cr11: tracing off
76 .long 0 # cr12: tracing off
77 .long 0 # cr13: home space segment table
78 .long 0xc0000000 # cr14: machine check handling off
79 .long 0 # cr15: linkage stack operations
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]80.Lmchunk:.long memory_chunk
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]81.Lbss_bgn: .long __bss_start
82.Lbss_end: .long _end
Heiko Carstensb1b70302006-06-29 14:58:17 +0200[diff] [blame]83.Lparmaddr: .long PARMAREA
Heiko Carstensab14de62007-02-05 21:18:37 +0100[diff] [blame]84.Linittu: .long init_thread_union
85.Lstartup_init:
86 .long startup_init
Gerald Schaefer482b05d2007-03-05 23:35:54 +0100[diff] [blame]87 .align 64
88.Lduct: .long 0,0,0,0,.Lduald,0,0,0
89 .long 0,0,0,0,0,0,0,0
90 .align 128
91.Lduald:.rept 8
92 .long 0x80000000,0,0,0 # invalid access-list entries
93 .endr
Heiko Carstense87bfe52006-09-20 15:59:15 +0200[diff] [blame]94
Heiko Carstensdc8f5d22006-07-18 13:44:57 +0200[diff] [blame]95 .org 0x12000
Heiko Carstens615b04b2007-02-21 10:55:37 +0100[diff] [blame]96 .globl _ehead
97_ehead:
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]98#ifdef CONFIG_SHARED_KERNEL
99 .org 0x100000
100#endif
101
102#
Heiko Carstensb1b70302006-06-29 14:58:17 +0200[diff] [blame]103# startup-code, running in absolute addressing mode
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]104#
105 .globl _stext
106_stext: basr %r13,0 # get base
107.LPG3:
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]108# check control registers
109 stctl %c0,%c15,0(%r15)
110 oi 2(%r15),0x40 # enable sigp emergency signal
111 oi 0(%r15),0x10 # switch on low address protection
112 lctl %c0,%c15,0(%r15)
113
114#
115 lam 0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
116 l %r14,.Lstart-.LPG3(%r13)
117 basr %r14,%r14 # call start_kernel
118#
119# We returned from start_kernel ?!? PANIK
120#
121 basr %r13,0
122 lpsw .Ldw-.(%r13) # load disabled wait psw
123#
124 .align 8
125.Ldw: .long 0x000a0000,0x00000000
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800[diff] [blame]126.Lstart:.long start_kernel
127.Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0