2 * arch/s390/kernel/head64.S
4 * Copyright (C) IBM Corp. 1999,2006
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>
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
19 startup:basr %r13,0 # get base
20 .LPG0: l %r13,0f-.LPG0(%r13)
22 0: .long startup_continue
25 # params at 10400 (setup.h)
29 .quad 0 # INITRD_START
33 .byte "root=/dev/ram0 ro"
39 basr %r13,0 # get base
40 .LPG1: sll %r13,1 # remove high order bit
43 #ifdef CONFIG_ZFCPDUMP
45 # check if we have been ipled using zfcp dump:
47 tm 0xb9,0x01 # test if subchannel is enabled
48 jno .nodump # subchannel disabled
50 la %r5,.Lipl_schib-.LPG1(%r13)
51 stsch 0(%r5) # get schib of subchannel
52 jne .nodump # schib not available
53 tm 5(%r5),0x01 # devno valid?
55 tm 4(%r5),0x80 # qdio capable device?
57 l %r2,20(%r0) # address of ipl parameter block
59 ic %r3,0x148(%r2) # get opt field
60 chi %r3,0x20 # load with dump?
63 # store all prefix registers in case of load with dump:
65 la %r7,0 # base register for 0 page
67 l %r11,.Lpref_arr_ptr-.LPG1(%r13) # address of prefix array
68 ahi %r11,4 # skip boot cpu
70 ahi %r12,(CONFIG_NR_CPUS*4) # end of prefix array
71 stap .Lcurrent_cpu+2-.LPG1(%r13) # store current cpu addr
73 cl %r8,.Lcurrent_cpu-.LPG1(%r13) # is ipl cpu ?
74 je 4f # if yes get next cpu
77 sigp %r9,%r8,0x9 # stop & store status of cpu
79 brc 4,4f # status stored: next cpu
80 brc 2,2b # busy: try again
81 brc 1,4f # not op: next cpu
83 mvc 0(4,%r11),264(%r7) # copy prefix register to prefix array
84 ahi %r11,4 # next element in prefix array
86 je 5f # no more space in prefix array
88 ahi %r8,1 # next cpu (r8 += 1)
89 cl %r8,.Llast_cpu-.LPG1(%r13) # is last possible cpu ?
90 jl 1b # jump if not last cpu
92 lhi %r1,2 # mode 2 = esame (dump)
100 lhi %r1,1 # mode 1 = esame (normal ipl)
103 lhi %r1,1 # mode 1 = esame (normal ipl)
104 #endif /* CONFIG_ZFCPDUMP */
105 mvi __LC_AR_MODE_ID,1 # set esame flag
106 slr %r0,%r0 # set cpuid to zero
107 sigp %r1,%r0,0x12 # switch to esame mode
108 sam64 # switch to 64 bit mode
109 lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
110 lg %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
111 # move IPL device to lowcore
112 mvc __LC_IPLDEV(4),IPL_DEVICE+4-PARMAREA(%r12)
116 larl %r15,init_thread_union
117 lg %r14,__TI_task(%r15) # cache current in lowcore
118 stg %r14,__LC_CURRENT
119 aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
120 stg %r15,__LC_KERNEL_STACK # set end of kernel stack
122 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
124 # Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
125 # and create a kernel NSS if the SAVESYS= parm is defined
127 brasl %r14,startup_init
128 # set program check new psw mask
129 mvc __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
130 larl %r12,machine_flags
132 # find out if we have the MVPG instruction
134 la %r1,0f-.LPG1(%r13) # set program check address
135 stg %r1,__LC_PGM_NEW_PSW+8
139 mvpg %r1,%r2 # test MVPG instruction
140 oi 7(%r12),16 # set MVPG flag
144 # find out if the diag 0x44 works in 64 bit mode
146 la %r1,0f-.LPG1(%r13) # set program check address
147 stg %r1,__LC_PGM_NEW_PSW+8
148 diag 0,0,0x44 # test diag 0x44
149 oi 7(%r12),32 # set diag44 flag
153 # find out if we have the IDTE instruction
155 la %r1,0f-.LPG1(%r13) # set program check address
156 stg %r1,__LC_PGM_NEW_PSW+8
157 .long 0xb2b10000 # store facility list
158 tm 0xc8,0x08 # check bit for clearing-by-ASCE
163 oi 7(%r12),0x80 # set IDTE flag
167 # find out if the diag 0x9c is available
169 la %r1,0f-.LPG1(%r13) # set program check address
170 stg %r1,__LC_PGM_NEW_PSW+8
171 stap __LC_CPUID+4 # store cpu address
173 diag %r1,0,0x9c # test diag 0x9c
174 oi 6(%r12),1 # set diag9c flag
178 # find out if we have the MVCOS instruction
180 la %r1,0f-.LPG1(%r13) # set program check address
181 stg %r1,__LC_PGM_NEW_PSW+8
182 .short 0xc800 # mvcos 0(%r0),0(%r0),%r0
185 0: tm 0x8f,0x13 # special-operation exception?
186 bno 1f-.LPG1(%r13) # if yes, MVCOS is present
187 oi 6(%r12),2 # set MVCOS flag
190 lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space,
191 # virtual and never return ...
193 .Lentry:.quad 0x0000000180000000,_stext
194 .Lctl: .quad 0x04b50002 # cr0: various things
195 .quad 0 # cr1: primary space segment table
196 .quad .Lduct # cr2: dispatchable unit control table
197 .quad 0 # cr3: instruction authorization
198 .quad 0 # cr4: instruction authorization
199 .quad .Lduct # cr5: primary-aste origin
200 .quad 0 # cr6: I/O interrupts
201 .quad 0 # cr7: secondary space segment table
202 .quad 0 # cr8: access registers translation
203 .quad 0 # cr9: tracing off
204 .quad 0 # cr10: tracing off
205 .quad 0 # cr11: tracing off
206 .quad 0 # cr12: tracing off
207 .quad 0 # cr13: home space segment table
208 .quad 0xc0000000 # cr14: machine check handling off
209 .quad 0 # cr15: linkage stack operations
210 .Lpcmsk:.quad 0x0000000180000000
211 .L4malign:.quad 0xffffffffffc00000
212 .Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8
213 .Lnop: .long 0x07000700
214 #ifdef CONFIG_ZFCPDUMP
220 .long zfcpdump_prefix_array
221 #endif /* CONFIG_ZFCPDUMP */
225 .Lduct: .long 0,0,0,0,.Lduald,0,0,0
226 .long 0,0,0,0,0,0,0,0
229 .long 0x80000000,0,0,0 # invalid access-list entries
235 #ifdef CONFIG_SHARED_KERNEL
240 # startup-code, running in absolute addressing mode
243 _stext: basr %r13,0 # get base
245 # check control registers
246 stctg %c0,%c15,0(%r15)
247 oi 6(%r15),0x40 # enable sigp emergency signal
248 oi 4(%r15),0x10 # switch on low address proctection
249 lctlg %c0,%c15,0(%r15)
251 lam 0,15,.Laregs-.LPG3(%r13) # load acrs needed by uaccess
252 brasl %r14,start_kernel # go to C code
254 # We returned from start_kernel ?!? PANIK
257 lpswe .Ldw-.(%r13) # load disabled wait psw
260 .Ldw: .quad 0x0002000180000000,0x0000000000000000
261 .Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0