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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * arch/s390/kernel/head.S
3 *
Heiko Carstensb1b70302006-06-29 14:58:17 +02004 * Copyright (C) IBM Corp. 1999,2006
Heiko Carstens0ad775d2005-11-07 00:59:12 -08005 *
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
11 * There are 5 different IPL methods
12 * 1) load the image directly into ram at address 0 and do an PSW restart
13 * 2) linload will load the image from address 0x10000 to memory 0x10000
14 * and start the code thru LPSW 0x0008000080010000 (VM only, deprecated)
15 * 3) generate the tape ipl header, store the generated image on a tape
16 * and ipl from it
17 * In case of SL tape you need to IPL 5 times to get past VOL1 etc
18 * 4) generate the vm reader ipl header, move the generated image to the
19 * VM reader (use option NOH!) and do a ipl from reader (VM only)
20 * 5) direct call of start by the SALIPL loader
21 * We use the cpuid to distinguish between VM and native ipl
22 * params for kernel are pushed to 0x10400 (see setup.h)
Heiko Carstens0ad775d2005-11-07 00:59:12 -080023 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 */
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <asm/setup.h>
27#include <asm/lowcore.h>
Sam Ravnborg0013a852005-09-09 20:57:26 +020028#include <asm/asm-offsets.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <asm/thread_info.h>
30#include <asm/page.h>
31
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080032#ifdef CONFIG_64BIT
Heiko Carstens0ad775d2005-11-07 00:59:12 -080033#define ARCH_OFFSET 4
34#else
35#define ARCH_OFFSET 0
36#endif
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#ifndef CONFIG_IPL
39 .org 0
40 .long 0x00080000,0x80000000+startup # Just a restart PSW
41#else
42#ifdef CONFIG_IPL_TAPE
43#define IPL_BS 1024
44 .org 0
45 .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
46 .long 0x27000000,0x60000001 # by ipl to addresses 0-23.
47 .long 0x02000000,0x20000000+IPL_BS # (a PSW and two CCWs).
48 .long 0x00000000,0x00000000 # external old psw
49 .long 0x00000000,0x00000000 # svc old psw
50 .long 0x00000000,0x00000000 # program check old psw
51 .long 0x00000000,0x00000000 # machine check old psw
52 .long 0x00000000,0x00000000 # io old psw
53 .long 0x00000000,0x00000000
54 .long 0x00000000,0x00000000
55 .long 0x00000000,0x00000000
56 .long 0x000a0000,0x00000058 # external new psw
57 .long 0x000a0000,0x00000060 # svc new psw
58 .long 0x000a0000,0x00000068 # program check new psw
59 .long 0x000a0000,0x00000070 # machine check new psw
60 .long 0x00080000,0x80000000+.Lioint # io new psw
61
62 .org 0x100
63#
64# subroutine for loading from tape
65# Paramters:
66# R1 = device number
67# R2 = load address
68.Lloader:
69 st %r14,.Lldret
70 la %r3,.Lorbread # r3 = address of orb
71 la %r5,.Lirb # r5 = address of irb
72 st %r2,.Lccwread+4 # initialize CCW data addresses
73 lctl %c6,%c6,.Lcr6
74 slr %r2,%r2
75.Lldlp:
76 la %r6,3 # 3 retries
77.Lssch:
78 ssch 0(%r3) # load chunk of IPL_BS bytes
79 bnz .Llderr
80.Lw4end:
81 bas %r14,.Lwait4io
82 tm 8(%r5),0x82 # do we have a problem ?
83 bnz .Lrecov
84 slr %r7,%r7
85 icm %r7,3,10(%r5) # get residual count
86 lcr %r7,%r7
87 la %r7,IPL_BS(%r7) # IPL_BS-residual=#bytes read
88 ar %r2,%r7 # add to total size
89 tm 8(%r5),0x01 # found a tape mark ?
90 bnz .Ldone
91 l %r0,.Lccwread+4 # update CCW data addresses
92 ar %r0,%r7
93 st %r0,.Lccwread+4
94 b .Lldlp
95.Ldone:
96 l %r14,.Lldret
97 br %r14 # r2 contains the total size
98.Lrecov:
99 bas %r14,.Lsense # do the sensing
100 bct %r6,.Lssch # dec. retry count & branch
101 b .Llderr
102#
103# Sense subroutine
104#
105.Lsense:
106 st %r14,.Lsnsret
107 la %r7,.Lorbsense
108 ssch 0(%r7) # start sense command
109 bnz .Llderr
110 bas %r14,.Lwait4io
111 l %r14,.Lsnsret
112 tm 8(%r5),0x82 # do we have a problem ?
113 bnz .Llderr
114 br %r14
115#
116# Wait for interrupt subroutine
117#
118.Lwait4io:
119 lpsw .Lwaitpsw
120.Lioint:
121 c %r1,0xb8 # compare subchannel number
122 bne .Lwait4io
123 tsch 0(%r5)
124 slr %r0,%r0
125 tm 8(%r5),0x82 # do we have a problem ?
126 bnz .Lwtexit
127 tm 8(%r5),0x04 # got device end ?
128 bz .Lwait4io
129.Lwtexit:
130 br %r14
131.Llderr:
132 lpsw .Lcrash
133
134 .align 8
135.Lorbread:
136 .long 0x00000000,0x0080ff00,.Lccwread
137 .align 8
138.Lorbsense:
139 .long 0x00000000,0x0080ff00,.Lccwsense
140 .align 8
141.Lccwread:
142 .long 0x02200000+IPL_BS,0x00000000
143.Lccwsense:
144 .long 0x04200001,0x00000000
145.Lwaitpsw:
146 .long 0x020a0000,0x80000000+.Lioint
147
148.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
149.Lcr6: .long 0xff000000
150 .align 8
151.Lcrash:.long 0x000a0000,0x00000000
152.Lldret:.long 0
153.Lsnsret: .long 0
154#endif /* CONFIG_IPL_TAPE */
155
156#ifdef CONFIG_IPL_VM
157#define IPL_BS 0x730
158 .org 0
159 .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
160 .long 0x02000018,0x60000050 # by ipl to addresses 0-23.
161 .long 0x02000068,0x60000050 # (a PSW and two CCWs).
162 .fill 80-24,1,0x40 # bytes 24-79 are discarded !!
163 .long 0x020000f0,0x60000050 # The next 160 byte are loaded
164 .long 0x02000140,0x60000050 # to addresses 0x18-0xb7
165 .long 0x02000190,0x60000050 # They form the continuation
166 .long 0x020001e0,0x60000050 # of the CCW program started
167 .long 0x02000230,0x60000050 # by ipl and load the range
168 .long 0x02000280,0x60000050 # 0x0f0-0x730 from the image
169 .long 0x020002d0,0x60000050 # to the range 0x0f0-0x730
170 .long 0x02000320,0x60000050 # in memory. At the end of
171 .long 0x02000370,0x60000050 # the channel program the PSW
172 .long 0x020003c0,0x60000050 # at location 0 is loaded.
173 .long 0x02000410,0x60000050 # Initial processing starts
174 .long 0x02000460,0x60000050 # at 0xf0 = iplstart.
175 .long 0x020004b0,0x60000050
176 .long 0x02000500,0x60000050
177 .long 0x02000550,0x60000050
178 .long 0x020005a0,0x60000050
179 .long 0x020005f0,0x60000050
180 .long 0x02000640,0x60000050
181 .long 0x02000690,0x60000050
182 .long 0x020006e0,0x20000050
183
184 .org 0xf0
185#
186# subroutine for loading cards from the reader
187#
188.Lloader:
189 la %r3,.Lorb # r2 = address of orb into r2
190 la %r5,.Lirb # r4 = address of irb
191 la %r6,.Lccws
192 la %r7,20
193.Linit:
194 st %r2,4(%r6) # initialize CCW data addresses
195 la %r2,0x50(%r2)
196 la %r6,8(%r6)
197 bct 7,.Linit
198
199 lctl %c6,%c6,.Lcr6 # set IO subclass mask
200 slr %r2,%r2
201.Lldlp:
202 ssch 0(%r3) # load chunk of 1600 bytes
203 bnz .Llderr
204.Lwait4irq:
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800205 mvc 0x78(8),.Lnewpsw # set up IO interrupt psw
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 lpsw .Lwaitpsw
207.Lioint:
208 c %r1,0xb8 # compare subchannel number
209 bne .Lwait4irq
210 tsch 0(%r5)
211
212 slr %r0,%r0
213 ic %r0,8(%r5) # get device status
214 chi %r0,8 # channel end ?
215 be .Lcont
216 chi %r0,12 # channel end + device end ?
217 be .Lcont
218
219 l %r0,4(%r5)
220 s %r0,8(%r3) # r0/8 = number of ccws executed
221 mhi %r0,10 # *10 = number of bytes in ccws
222 lh %r3,10(%r5) # get residual count
223 sr %r0,%r3 # #ccws*80-residual=#bytes read
224 ar %r2,%r0
225
226 br %r14 # r2 contains the total size
227
228.Lcont:
229 ahi %r2,0x640 # add 0x640 to total size
230 la %r6,.Lccws
231 la %r7,20
232.Lincr:
233 l %r0,4(%r6) # update CCW data addresses
234 ahi %r0,0x640
235 st %r0,4(%r6)
236 ahi %r6,8
237 bct 7,.Lincr
238
239 b .Lldlp
240.Llderr:
241 lpsw .Lcrash
242
243 .align 8
244.Lorb: .long 0x00000000,0x0080ff00,.Lccws
245.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
246.Lcr6: .long 0xff000000
247.Lloadp:.long 0,0
248 .align 8
249.Lcrash:.long 0x000a0000,0x00000000
250.Lnewpsw:
251 .long 0x00080000,0x80000000+.Lioint
252.Lwaitpsw:
253 .long 0x020a0000,0x80000000+.Lioint
254
255 .align 8
256.Lccws: .rept 19
257 .long 0x02600050,0x00000000
258 .endr
259 .long 0x02200050,0x00000000
260#endif /* CONFIG_IPL_VM */
261
262iplstart:
263 lh %r1,0xb8 # test if subchannel number
264 bct %r1,.Lnoload # is valid
265 l %r1,0xb8 # load ipl subchannel number
266 la %r2,IPL_BS # load start address
267 bas %r14,.Lloader # load rest of ipl image
268 l %r12,.Lparm # pointer to parameter area
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800269 st %r1,IPL_DEVICE+ARCH_OFFSET-PARMAREA(%r12) # save ipl device number
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271#
272# load parameter file from ipl device
273#
274.Lagain1:
Heiko Carstens65912a82006-09-20 15:58:41 +0200275 l %r2,.Linitrd # ramdisk loc. is temp
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 bas %r14,.Lloader # load parameter file
277 ltr %r2,%r2 # got anything ?
278 bz .Lnopf
279 chi %r2,895
280 bnh .Lnotrunc
281 la %r2,895
282.Lnotrunc:
Heiko Carstens65912a82006-09-20 15:58:41 +0200283 l %r4,.Linitrd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 clc 0(3,%r4),.L_hdr # if it is HDRx
285 bz .Lagain1 # skip dataset header
286 clc 0(3,%r4),.L_eof # if it is EOFx
287 bz .Lagain1 # skip dateset trailer
288 la %r5,0(%r4,%r2)
289 lr %r3,%r2
290.Lidebc:
291 tm 0(%r5),0x80 # high order bit set ?
292 bo .Ldocv # yes -> convert from EBCDIC
293 ahi %r5,-1
294 bct %r3,.Lidebc
295 b .Lnocv
296.Ldocv:
297 l %r3,.Lcvtab
298 tr 0(256,%r4),0(%r3) # convert parameters to ascii
299 tr 256(256,%r4),0(%r3)
300 tr 512(256,%r4),0(%r3)
301 tr 768(122,%r4),0(%r3)
302.Lnocv: la %r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
303 mvc 0(256,%r3),0(%r4)
304 mvc 256(256,%r3),256(%r4)
305 mvc 512(256,%r3),512(%r4)
306 mvc 768(122,%r3),768(%r4)
307 slr %r0,%r0
308 b .Lcntlp
309.Ldelspc:
310 ic %r0,0(%r2,%r3)
311 chi %r0,0x20 # is it a space ?
312 be .Lcntlp
313 ahi %r2,1
314 b .Leolp
315.Lcntlp:
316 brct %r2,.Ldelspc
317.Leolp:
318 slr %r0,%r0
319 stc %r0,0(%r2,%r3) # terminate buffer
320.Lnopf:
321
322#
323# load ramdisk from ipl device
324#
325.Lagain2:
Heiko Carstens65912a82006-09-20 15:58:41 +0200326 l %r2,.Linitrd # addr of ramdisk
327 st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 bas %r14,.Lloader # load ramdisk
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800329 st %r2,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r12) # store size of ramdisk
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 ltr %r2,%r2
331 bnz .Lrdcont
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800332 st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # no ramdisk found
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333.Lrdcont:
Heiko Carstens65912a82006-09-20 15:58:41 +0200334 l %r2,.Linitrd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 clc 0(3,%r2),.L_hdr # skip HDRx and EOFx
337 bz .Lagain2
338 clc 0(3,%r2),.L_eof
339 bz .Lagain2
340
341#ifdef CONFIG_IPL_VM
342#
343# reset files in VM reader
344#
345 stidp __LC_CPUID # store cpuid
346 tm __LC_CPUID,0xff # running VM ?
347 bno .Lnoreset
348 la %r2,.Lreset
349 lhi %r3,26
Heiko Carstens2b071882005-06-21 17:16:31 -0700350 diag %r2,%r3,8
Heiko Carstens350e3ad2005-07-29 14:03:36 -0700351 la %r5,.Lirb
352 stsch 0(%r5) # check if irq is pending
353 tm 30(%r5),0x0f # by verifying if any of the
354 bnz .Lwaitforirq # activity or status control
355 tm 31(%r5),0xff # bits is set in the schib
356 bz .Lnoreset
357.Lwaitforirq:
Heiko Carstens2b071882005-06-21 17:16:31 -0700358 mvc 0x78(8),.Lrdrnewpsw # set up IO interrupt psw
359.Lwaitrdrirq:
360 lpsw .Lrdrwaitpsw
361.Lrdrint:
362 c %r1,0xb8 # compare subchannel number
363 bne .Lwaitrdrirq
364 la %r5,.Lirb
365 tsch 0(%r5)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366.Lnoreset:
Heiko Carstens2b071882005-06-21 17:16:31 -0700367 b .Lnoload
368
369 .align 8
370.Lrdrnewpsw:
371 .long 0x00080000,0x80000000+.Lrdrint
372.Lrdrwaitpsw:
373 .long 0x020a0000,0x80000000+.Lrdrint
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374#endif
Heiko Carstens2b071882005-06-21 17:16:31 -0700375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376#
377# everything loaded, go for it
378#
379.Lnoload:
380 l %r1,.Lstartup
381 br %r1
382
Heiko Carstens65912a82006-09-20 15:58:41 +0200383.Linitrd:.long _end + 0x400000 # default address of initrd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384.Lparm: .long PARMAREA
385.Lstartup: .long startup
386.Lcvtab:.long _ebcasc # ebcdic to ascii table
387.Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40
388 .byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6
389 .byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold"
390.L_eof: .long 0xc5d6c600 /* C'EOF' */
391.L_hdr: .long 0xc8c4d900 /* C'HDR' */
392
393#endif /* CONFIG_IPL */
394
395#
396# SALIPL loader support. Based on a patch by Rob van der Heij.
397# This entry point is called directly from the SALIPL loader and
398# doesn't need a builtin ipl record.
399#
400 .org 0x800
401 .globl start
402start:
403 stm %r0,%r15,0x07b0 # store registers
404 basr %r12,%r0
405.base:
406 l %r11,.parm
407 l %r8,.cmd # pointer to command buffer
408
409 ltr %r9,%r9 # do we have SALIPL parameters?
410 bp .sk8x8
411
412 mvc 0(64,%r8),0x00b0 # copy saved registers
413 xc 64(240-64,%r8),0(%r8) # remainder of buffer
414 tr 0(64,%r8),.lowcase
415 b .gotr
416.sk8x8:
417 mvc 0(240,%r8),0(%r9) # copy iplparms into buffer
418.gotr:
419 l %r10,.tbl # EBCDIC to ASCII table
420 tr 0(240,%r8),0(%r10)
421 stidp __LC_CPUID # Are we running on VM maybe
422 cli __LC_CPUID,0xff
423 bnz .test
424 .long 0x83300060 # diag 3,0,x'0060' - storage size
425 b .done
426.test:
427 mvc 0x68(8),.pgmnw # set up pgm check handler
428 l %r2,.fourmeg
429 lr %r3,%r2
430 bctr %r3,%r0 # 4M-1
431.loop: iske %r0,%r3
432 ar %r3,%r2
433.pgmx:
434 sr %r3,%r2
435 la %r3,1(%r3)
436.done:
437 l %r1,.memsize
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800438 st %r3,ARCH_OFFSET(%r1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 slr %r0,%r0
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800440 st %r0,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r11)
441 st %r0,INITRD_START+ARCH_OFFSET-PARMAREA(%r11)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 j startup # continue with startup
443.tbl: .long _ebcasc # translate table
444.cmd: .long COMMAND_LINE # address of command line buffer
445.parm: .long PARMAREA
446.memsize: .long memory_size
447.fourmeg: .long 0x00400000 # 4M
448.pgmnw: .long 0x00080000,.pgmx
449.lowcase:
450 .byte 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07
451 .byte 0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f
452 .byte 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17
453 .byte 0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f
454 .byte 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27
455 .byte 0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f
456 .byte 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37
457 .byte 0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f
458 .byte 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47
459 .byte 0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f
460 .byte 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57
461 .byte 0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f
462 .byte 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67
463 .byte 0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f
464 .byte 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77
465 .byte 0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f
466
467 .byte 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87
468 .byte 0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f
469 .byte 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97
470 .byte 0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f
471 .byte 0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7
472 .byte 0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf
473 .byte 0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7
474 .byte 0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf
475 .byte 0xc0,0x81,0x82,0x83,0x84,0x85,0x86,0x87 # .abcdefg
476 .byte 0x88,0x89,0xca,0xcb,0xcc,0xcd,0xce,0xcf # hi
477 .byte 0xd0,0x91,0x92,0x93,0x94,0x95,0x96,0x97 # .jklmnop
478 .byte 0x98,0x99,0xda,0xdb,0xdc,0xdd,0xde,0xdf # qr
479 .byte 0xe0,0xe1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7 # ..stuvwx
480 .byte 0xa8,0xa9,0xea,0xeb,0xec,0xed,0xee,0xef # yz
481 .byte 0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7
482 .byte 0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff
483
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800484#ifdef CONFIG_64BIT
Heiko Carstens0ad775d2005-11-07 00:59:12 -0800485#include "head64.S"
486#else
487#include "head31.S"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488#endif