aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/kernel/head31.S
blob: 453fd3b4edea6e59d8a2600f43d72af32c43b43f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
/*
 * arch/s390/kernel/head31.S
 *
 * Copyright (C) IBM Corp. 2005,2006
 *
 *   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>
 *
 */

#
# startup-code at 0x10000, running in absolute addressing mode
# this is called either by the ipl loader or directly by PSW restart
# or linload or SALIPL
#
	.org	0x10000
startup:basr	%r13,0			# get base
.LPG0:	l	%r13,0f-.LPG0(%r13)
	b	0(%r13)
0:	.long	startup_continue

#
# params at 10400 (setup.h)
#
	.org	PARMAREA
	.long	0,0			# IPL_DEVICE
	.long	0,0			# INITRD_START
	.long	0,0			# INITRD_SIZE

	.org	COMMAND_LINE
	.byte	"root=/dev/ram0 ro"
	.byte	0

	.org	0x11000

startup_continue:
	basr	%r13,0			# get base
.LPG1:	mvi	__LC_AR_MODE_ID,0	# set ESA flag (mode 0)
	lctl	%c0,%c15,.Lctl-.LPG1(%r13) # load control registers
	l	%r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
					# move IPL device to lowcore
	mvc	__LC_IPLDEV(4),IPL_DEVICE-PARMAREA(%r12)
#
# Setup stack
#
	l	%r15,.Linittu-.LPG1(%r13)
	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
	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
#
# 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

	l	%r12,.Lmflags-.LPG1(%r13) # get address of machine_flags
#
# find out if we have an IEEE fpu
#
	mvc	__LC_PGM_NEW_PSW(8),.Lpcfpu-.LPG1(%r13)
	efpc	%r0,0			# test IEEE extract fpc instruction
	oi	3(%r12),2		# set IEEE fpu flag
.Lchkfpu:

#
# find out if we have the CSP instruction
#
       mvc	 __LC_PGM_NEW_PSW(8),.Lpccsp-.LPG1(%r13)
       la	 %r0,0
       lr	%r1,%r0
       la	%r2,4
       csp	%r0,%r2			# Test CSP instruction
       oi	3(%r12),8		# set CSP flag
.Lchkcsp:

#
# find out if we have the MVPG instruction
#
       mvc	__LC_PGM_NEW_PSW(8),.Lpcmvpg-.LPG1(%r13)
       sr	%r0,%r0
       la	%r1,0
       la	%r2,0
       mvpg	%r1,%r2			# Test CSP instruction
       oi	3(%r12),16		# set MVPG flag
.Lchkmvpg:

#
# find out if we have the IDTE instruction
#
	mvc	__LC_PGM_NEW_PSW(8),.Lpcidte-.LPG1(%r13)
	.long	0xb2b10000		# store facility list
	tm	0xc8,0x08		# check bit for clearing-by-ASCE
	bno	.Lchkidte-.LPG1(%r13)
	lhi	%r1,2094
	lhi	%r2,0
	.long	0xb98e2001
	oi	3(%r12),0x80		# set IDTE flag
.Lchkidte:

#
# find out if the diag 0x9c is available
#
	mvc	__LC_PGM_NEW_PSW(8),.Lpcdiag9c-.LPG1(%r13)
	stap	__LC_CPUID+4		# store cpu address
	lh	%r1,__LC_CPUID+4
	diag	%r1,0,0x9c		# test diag 0x9c
	oi	2(%r12),1		# set diag9c flag
.Lchkdiag9c:

	lpsw  .Lentry-.LPG1(13)		# jump to _stext in primary-space,
					# virtual and never return ...
	.align	8
.Lentry:.long	0x00080000,0x80000000 + _stext
.Lctl:	.long	0x04b50002		# 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	0xffffffff		# 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
.Lduct:	.long	0,0,0,0,0,0,0,0
	.long	0,0,0,0,0,0,0,0
.Lpcfpu:.long	0x00080000,0x80000000 + .Lchkfpu
.Lpccsp:.long	0x00080000,0x80000000 + .Lchkcsp
.Lpcmvpg:.long	0x00080000,0x80000000 + .Lchkmvpg
.Lpcidte:.long	0x00080000,0x80000000 + .Lchkidte
.Lpcdiag9c:.long 0x00080000,0x80000000 + .Lchkdiag9c
.Lmchunk:.long	memory_chunk
.Lmflags:.long	machine_flags
.Lbss_bgn:  .long __bss_start
.Lbss_end:  .long _end
.Lparmaddr: .long PARMAREA
.Linittu:   .long init_thread_union
.Lstartup_init:
	    .long startup_init

	.globl ipl_schib
ipl_schib:
	.rept 13
	.long 0
	.endr

	.globl ipl_flags
ipl_flags:
	.long 0
	.globl ipl_devno
ipl_devno:
	.word 0

	.org	0x12000
#ifdef CONFIG_SHARED_KERNEL
	.org	0x100000
#endif

#
# startup-code, running in absolute addressing mode
#
	.globl	_stext
_stext:	basr	%r13,0			# get base
.LPG3:
# check control registers
	stctl	%c0,%c15,0(%r15)
	oi	2(%r15),0x40		# enable sigp emergency signal
	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