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1/*
2 * Copyright IBM Corp. 1999, 2010
3 *
4 * Author(s): Hartmut Penner <hp@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Rob van der Heij <rvdhei@iae.nl>
7 * Heiko Carstens <heiko.carstens@de.ibm.com>
8 *
9 * There are 5 different IPL methods
10 * 1) load the image directly into ram at address 0 and do an PSW restart
11 * 2) linload will load the image from address 0x10000 to memory 0x10000
12 * and start the code thru LPSW 0x0008000080010000 (VM only, deprecated)
13 * 3) generate the tape ipl header, store the generated image on a tape
14 * and ipl from it
15 * In case of SL tape you need to IPL 5 times to get past VOL1 etc
16 * 4) generate the vm reader ipl header, move the generated image to the
17 * VM reader (use option NOH!) and do a ipl from reader (VM only)
18 * 5) direct call of start by the SALIPL loader
19 * We use the cpuid to distinguish between VM and native ipl
20 * params for kernel are pushed to 0x10400 (see setup.h)
21 *
22 */
23
24#include <linux/init.h>
25#include <linux/linkage.h>
26#include <asm/asm-offsets.h>
27#include <asm/thread_info.h>
28#include <asm/facility.h>
29#include <asm/page.h>
30#include <asm/ptrace.h>
31
32#define ARCH_OFFSET 4
33
34__HEAD
35
36#define IPL_BS 0x730
37 .org 0
38 .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
39 .long 0x02000018,0x60000050 # by ipl to addresses 0-23.
40 .long 0x02000068,0x60000050 # (a PSW and two CCWs).
41 .fill 80-24,1,0x40 # bytes 24-79 are discarded !!
42 .long 0x020000f0,0x60000050 # The next 160 byte are loaded
43 .long 0x02000140,0x60000050 # to addresses 0x18-0xb7
44 .long 0x02000190,0x60000050 # They form the continuation
45 .long 0x020001e0,0x60000050 # of the CCW program started
46 .long 0x02000230,0x60000050 # by ipl and load the range
47 .long 0x02000280,0x60000050 # 0x0f0-0x730 from the image
48 .long 0x020002d0,0x60000050 # to the range 0x0f0-0x730
49 .long 0x02000320,0x60000050 # in memory. At the end of
50 .long 0x02000370,0x60000050 # the channel program the PSW
51 .long 0x020003c0,0x60000050 # at location 0 is loaded.
52 .long 0x02000410,0x60000050 # Initial processing starts
53 .long 0x02000460,0x60000050 # at 0x200 = iplstart.
54 .long 0x020004b0,0x60000050
55 .long 0x02000500,0x60000050
56 .long 0x02000550,0x60000050
57 .long 0x020005a0,0x60000050
58 .long 0x020005f0,0x60000050
59 .long 0x02000640,0x60000050
60 .long 0x02000690,0x60000050
61 .long 0x020006e0,0x20000050
62
63 .org 0x200
64
65#
66# subroutine to wait for end I/O
67#
68.Lirqwait:
69 mvc 0x1f0(16),.Lnewpsw # set up IO interrupt psw
70 lpsw .Lwaitpsw
71.Lioint:
72 br %r14
73 .align 8
74.Lnewpsw:
75 .quad 0x0000000080000000,.Lioint
76.Lwaitpsw:
77 .long 0x020a0000,0x80000000+.Lioint
78
79#
80# subroutine for loading cards from the reader
81#
82.Lloader:
83 la %r4,0(%r14)
84 la %r3,.Lorb # r2 = address of orb into r2
85 la %r5,.Lirb # r4 = address of irb
86 la %r6,.Lccws
87 la %r7,20
88.Linit:
89 st %r2,4(%r6) # initialize CCW data addresses
90 la %r2,0x50(%r2)
91 la %r6,8(%r6)
92 bct 7,.Linit
93
94 lctl %c6,%c6,.Lcr6 # set IO subclass mask
95 slr %r2,%r2
96.Lldlp:
97 ssch 0(%r3) # load chunk of 1600 bytes
98 bnz .Llderr
99.Lwait4irq:
100 bas %r14,.Lirqwait
101 c %r1,0xb8 # compare subchannel number
102 bne .Lwait4irq
103 tsch 0(%r5)
104
105 slr %r0,%r0
106 ic %r0,8(%r5) # get device status
107 chi %r0,8 # channel end ?
108 be .Lcont
109 chi %r0,12 # channel end + device end ?
110 be .Lcont
111
112 l %r0,4(%r5)
113 s %r0,8(%r3) # r0/8 = number of ccws executed
114 mhi %r0,10 # *10 = number of bytes in ccws
115 lh %r3,10(%r5) # get residual count
116 sr %r0,%r3 # #ccws*80-residual=#bytes read
117 ar %r2,%r0
118
119 br %r4 # r2 contains the total size
120
121.Lcont:
122 ahi %r2,0x640 # add 0x640 to total size
123 la %r6,.Lccws
124 la %r7,20
125.Lincr:
126 l %r0,4(%r6) # update CCW data addresses
127 ahi %r0,0x640
128 st %r0,4(%r6)
129 ahi %r6,8
130 bct 7,.Lincr
131
132 b .Lldlp
133.Llderr:
134 lpsw .Lcrash
135
136 .align 8
137.Lorb: .long 0x00000000,0x0080ff00,.Lccws
138.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
139.Lcr6: .long 0xff000000
140.Lloadp:.long 0,0
141 .align 8
142.Lcrash:.long 0x000a0000,0x00000000
143
144 .align 8
145.Lccws: .rept 19
146 .long 0x02600050,0x00000000
147 .endr
148 .long 0x02200050,0x00000000
149
150iplstart:
151 mvi __LC_AR_MODE_ID,1 # set esame flag
152 slr %r0,%r0 # set cpuid to zero
153 lhi %r1,2 # mode 2 = esame (dump)
154 sigp %r1,%r0,0x12 # switch to esame mode
155 bras %r13,0f
156 .fill 16,4,0x0
1570: lmh %r0,%r15,0(%r13) # clear high-order half of gprs
158 sam31 # switch to 31 bit addressing mode
159 lh %r1,0xb8 # test if subchannel number
160 bct %r1,.Lnoload # is valid
161 l %r1,0xb8 # load ipl subchannel number
162 la %r2,IPL_BS # load start address
163 bas %r14,.Lloader # load rest of ipl image
164 l %r12,.Lparm # pointer to parameter area
165 st %r1,IPL_DEVICE+ARCH_OFFSET-PARMAREA(%r12) # save ipl device number
166
167#
168# load parameter file from ipl device
169#
170.Lagain1:
171 l %r2,.Linitrd # ramdisk loc. is temp
172 bas %r14,.Lloader # load parameter file
173 ltr %r2,%r2 # got anything ?
174 bz .Lnopf
175 chi %r2,895
176 bnh .Lnotrunc
177 la %r2,895
178.Lnotrunc:
179 l %r4,.Linitrd
180 clc 0(3,%r4),.L_hdr # if it is HDRx
181 bz .Lagain1 # skip dataset header
182 clc 0(3,%r4),.L_eof # if it is EOFx
183 bz .Lagain1 # skip dateset trailer
184 la %r5,0(%r4,%r2)
185 lr %r3,%r2
186 la %r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
187 mvc 0(256,%r3),0(%r4)
188 mvc 256(256,%r3),256(%r4)
189 mvc 512(256,%r3),512(%r4)
190 mvc 768(122,%r3),768(%r4)
191 slr %r0,%r0
192 b .Lcntlp
193.Ldelspc:
194 ic %r0,0(%r2,%r3)
195 chi %r0,0x20 # is it a space ?
196 be .Lcntlp
197 ahi %r2,1
198 b .Leolp
199.Lcntlp:
200 brct %r2,.Ldelspc
201.Leolp:
202 slr %r0,%r0
203 stc %r0,0(%r2,%r3) # terminate buffer
204.Lnopf:
205
206#
207# load ramdisk from ipl device
208#
209.Lagain2:
210 l %r2,.Linitrd # addr of ramdisk
211 st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12)
212 bas %r14,.Lloader # load ramdisk
213 st %r2,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r12) # store size of rd
214 ltr %r2,%r2
215 bnz .Lrdcont
216 st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # no ramdisk found
217.Lrdcont:
218 l %r2,.Linitrd
219
220 clc 0(3,%r2),.L_hdr # skip HDRx and EOFx
221 bz .Lagain2
222 clc 0(3,%r2),.L_eof
223 bz .Lagain2
224
225#
226# reset files in VM reader
227#
228 stidp .Lcpuid # store cpuid
229 tm .Lcpuid,0xff # running VM ?
230 bno .Lnoreset
231 la %r2,.Lreset
232 lhi %r3,26
233 diag %r2,%r3,8
234 la %r5,.Lirb
235 stsch 0(%r5) # check if irq is pending
236 tm 30(%r5),0x0f # by verifying if any of the
237 bnz .Lwaitforirq # activity or status control
238 tm 31(%r5),0xff # bits is set in the schib
239 bz .Lnoreset
240.Lwaitforirq:
241 bas %r14,.Lirqwait # wait for IO interrupt
242 c %r1,0xb8 # compare subchannel number
243 bne .Lwaitforirq
244 la %r5,.Lirb
245 tsch 0(%r5)
246.Lnoreset:
247 b .Lnoload
248
249#
250# everything loaded, go for it
251#
252.Lnoload:
253 l %r1,.Lstartup
254 br %r1
255
256.Linitrd:.long _end # default address of initrd
257.Lparm: .long PARMAREA
258.Lstartup: .long startup
259.Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40
260 .byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6
261 .byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold"
262.L_eof: .long 0xc5d6c600 /* C'EOF' */
263.L_hdr: .long 0xc8c4d900 /* C'HDR' */
264 .align 8
265.Lcpuid:.fill 8,1,0
266
267#
268# startup-code at 0x10000, running in absolute addressing mode
269# this is called either by the ipl loader or directly by PSW restart
270# or linload or SALIPL
271#
272 .org 0x10000
273ENTRY(startup)
274 j .Lep_startup_normal
275 .org 0x10008
276#
277# This is a list of s390 kernel entry points. At address 0x1000f the number of
278# valid entry points is stored.
279#
280# IMPORTANT: Do not change this table, it is s390 kernel ABI!
281#
282 .ascii "S390EP"
283 .byte 0x00,0x01
284#
285# kdump startup-code at 0x10010, running in 64 bit absolute addressing mode
286#
287 .org 0x10010
288ENTRY(startup_kdump)
289 j .Lep_startup_kdump
290.Lep_startup_normal:
291 mvi __LC_AR_MODE_ID,1 # set esame flag
292 slr %r0,%r0 # set cpuid to zero
293 lhi %r1,2 # mode 2 = esame (dump)
294 sigp %r1,%r0,0x12 # switch to esame mode
295 bras %r13,0f
296 .fill 16,4,0x0
2970: lmh %r0,%r15,0(%r13) # clear high-order half of gprs
298 sam64 # switch to 64 bit addressing mode
299 basr %r13,0 # get base
300.LPG0:
301 xc 0x200(256),0x200 # partially clear lowcore
302 xc 0x300(256),0x300
303 xc 0xe00(256),0xe00
304 xc 0xf00(256),0xf00
305 lctlg %c0,%c15,0x200(%r0) # initialize control registers
306 stck __LC_LAST_UPDATE_CLOCK
307 spt 6f-.LPG0(%r13)
308 mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
309 stfl 0(%r0) # store facilities @ __LC_STFL_FAC_LIST
310 mvc __LC_STFLE_FAC_LIST(4),__LC_STFL_FAC_LIST
311 tm __LC_STFLE_FAC_LIST,0x01 # stfle available ?
312 jz 0f
313 lghi %r0,FACILITIES_ALS_DWORDS-1
314 .insn s,0xb2b00000,__LC_STFLE_FAC_LIST # store facility list extended
315 # verify if all required facilities are supported by the machine
3160: la %r1,__LC_STFLE_FAC_LIST
317 la %r2,3f+8-.LPG0(%r13)
318 lhi %r3,FACILITIES_ALS_DWORDS
3191: lg %r0,0(%r1)
320 ng %r0,0(%r2)
321 clg %r0,0(%r2)
322 jne 2f
323 la %r1,8(%r1)
324 la %r2,8(%r2)
325 ahi %r3,-1
326 jnz 1b
327 j 4f
3282: l %r15,.Lstack-.LPG0(%r13)
329 ahi %r15,-STACK_FRAME_OVERHEAD
330 la %r2,.Lals_string-.LPG0(%r13)
331 l %r3,.Lsclp_print-.LPG0(%r13)
332 basr %r14,%r3
333 lpsw 3f-.LPG0(%r13) # machine type not good enough, crash
334.Lals_string:
335 .asciz "The Linux kernel requires more recent processor hardware"
336.Lsclp_print:
337 .long _sclp_print_early
338.Lstack:
339 .long 0x8000 + (1<<(PAGE_SHIFT+THREAD_ORDER))
340 .align 16
3413: .long 0x000a0000,0x8badcccc
342
343# List of facilities that are required. If not all facilities are present
344# the kernel will crash.
345
346 .quad FACILITIES_ALS
347
3484:
349 /* Continue with startup code in head64.S */
350 jg startup_continue
351
352 .align 8
3536: .long 0x7fffffff,0xffffffff
354
355#include "head_kdump.S"
356
357#
358# params at 10400 (setup.h)
359#
360 .org PARMAREA
361 .long 0,0 # IPL_DEVICE
362 .long 0,0 # INITRD_START
363 .long 0,0 # INITRD_SIZE
364 .long 0,0 # OLDMEM_BASE
365 .long 0,0 # OLDMEM_SIZE
366
367 .org COMMAND_LINE
368 .byte "root=/dev/ram0 ro"
369 .byte 0
370
371 .org 0x11000