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[PATCH] s390: fix memory leak in vmcp
[linux-2.6-block.git] / arch / s390 / kernel / head64.S
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1da177e4
LT		 1/*
2 * arch/s390/kernel/head.S
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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 *
10 * There are 5 different IPL methods
11 * 1) load the image directly into ram at address 0 and do an PSW restart
12 * 2) linload will load the image from address 0x10000 to memory 0x10000
13 * and start the code thru LPSW 0x0008000080010000 (VM only, deprecated)
14 * 3) generate the tape ipl header, store the generated image on a tape
15 * and ipl from it
16 * In case of SL tape you need to IPL 5 times to get past VOL1 etc
17 * 4) generate the vm reader ipl header, move the generated image to the
18 * VM reader (use option NOH!) and do a ipl from reader (VM only)
19 * 5) direct call of start by the SALIPL loader
20 * We use the cpuid to distinguish between VM and native ipl
21 * params for kernel are pushed to 0x10400 (see setup.h)
22
23 Changes:
24 Okt 25 2000 <rvdheij@iae.nl>
25 added code to skip HDR and EOF to allow SL tape IPL (5 retries)
26 changed first CCW from rewind to backspace block
27
28 */
29
30#include <linux/config.h>
31#include <asm/setup.h>
32#include <asm/lowcore.h>
0013a854 33#include <asm/asm-offsets.h>
1da177e4
LT		 34#include <asm/thread_info.h>
35#include <asm/page.h>
36
37#ifndef CONFIG_IPL
38 .org 0
39 .long 0x00080000,0x80000000+startup # Just a restart PSW
40#else
41#ifdef CONFIG_IPL_TAPE
42#define IPL_BS 1024
43 .org 0
44 .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
45 .long 0x27000000,0x60000001 # by ipl to addresses 0-23.
46 .long 0x02000000,0x20000000+IPL_BS # (a PSW and two CCWs).
47 .long 0x00000000,0x00000000 # external old psw
48 .long 0x00000000,0x00000000 # svc old psw
49 .long 0x00000000,0x00000000 # program check old psw
50 .long 0x00000000,0x00000000 # machine check old psw
51 .long 0x00000000,0x00000000 # io old psw
52 .long 0x00000000,0x00000000
53 .long 0x00000000,0x00000000
54 .long 0x00000000,0x00000000
55 .long 0x000a0000,0x00000058 # external new psw
56 .long 0x000a0000,0x00000060 # svc new psw
57 .long 0x000a0000,0x00000068 # program check new psw
58 .long 0x000a0000,0x00000070 # machine check new psw
59 .long 0x00080000,0x80000000+.Lioint # io new psw
60
61 .org 0x100
62#
63# subroutine for loading from tape
64# Paramters:
65# R1 = device number
66# R2 = load address
67.Lloader:
68 st %r14,.Lldret
69 la %r3,.Lorbread # r3 = address of orb
70 la %r5,.Lirb # r5 = address of irb
71 st %r2,.Lccwread+4 # initialize CCW data addresses
72 lctl %c6,%c6,.Lcr6
73 slr %r2,%r2
74.Lldlp:
75 la %r6,3 # 3 retries
76.Lssch:
77 ssch 0(%r3) # load chunk of IPL_BS bytes
78 bnz .Llderr
79.Lw4end:
80 bas %r14,.Lwait4io
81 tm 8(%r5),0x82 # do we have a problem ?
82 bnz .Lrecov
83 slr %r7,%r7
84 icm %r7,3,10(%r5) # get residual count
85 lcr %r7,%r7
86 la %r7,IPL_BS(%r7) # IPL_BS-residual=#bytes read
87 ar %r2,%r7 # add to total size
88 tm 8(%r5),0x01 # found a tape mark ?
89 bnz .Ldone
90 l %r0,.Lccwread+4 # update CCW data addresses
91 ar %r0,%r7
92 st %r0,.Lccwread+4
93 b .Lldlp
94.Ldone:
95 l %r14,.Lldret
96 br %r14 # r2 contains the total size
97.Lrecov:
98 bas %r14,.Lsense # do the sensing
99 bct %r6,.Lssch # dec. retry count & branch
100 b .Llderr
101#
102# Sense subroutine
103#
104.Lsense:
105 st %r14,.Lsnsret
106 la %r7,.Lorbsense
107 ssch 0(%r7) # start sense command
108 bnz .Llderr
109 bas %r14,.Lwait4io
110 l %r14,.Lsnsret
111 tm 8(%r5),0x82 # do we have a problem ?
112 bnz .Llderr
113 br %r14
114#
115# Wait for interrupt subroutine
116#
117.Lwait4io:
118 lpsw .Lwaitpsw
119.Lioint:
120 c %r1,0xb8 # compare subchannel number
121 bne .Lwait4io
122 tsch 0(%r5)
123 slr %r0,%r0
124 tm 8(%r5),0x82 # do we have a problem ?
125 bnz .Lwtexit
126 tm 8(%r5),0x04 # got device end ?
127 bz .Lwait4io
128.Lwtexit:
129 br %r14
130.Llderr:
131 lpsw .Lcrash
132
133 .align 8
134.Lorbread:
135 .long 0x00000000,0x0080ff00,.Lccwread
136 .align 8
137.Lorbsense:
138 .long 0x00000000,0x0080ff00,.Lccwsense
139 .align 8
140.Lccwread:
141 .long 0x02200000+IPL_BS,0x00000000
142.Lccwsense:
143 .long 0x04200001,0x00000000
144.Lwaitpsw:
145 .long 0x020a0000,0x80000000+.Lioint
146
147.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
148.Lcr6: .long 0xff000000
149 .align 8
150.Lcrash:.long 0x000a0000,0x00000000
151.Lldret:.long 0
152.Lsnsret: .long 0
153#endif /* CONFIG_IPL_TAPE */
154
155#ifdef CONFIG_IPL_VM
156#define IPL_BS 0x730
157 .org 0
158 .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
159 .long 0x02000018,0x60000050 # by ipl to addresses 0-23.
160 .long 0x02000068,0x60000050 # (a PSW and two CCWs).
161 .fill 80-24,1,0x40 # bytes 24-79 are discarded !!
162 .long 0x020000f0,0x60000050 # The next 160 byte are loaded
163 .long 0x02000140,0x60000050 # to addresses 0x18-0xb7
164 .long 0x02000190,0x60000050 # They form the continuation
165 .long 0x020001e0,0x60000050 # of the CCW program started
166 .long 0x02000230,0x60000050 # by ipl and load the range
167 .long 0x02000280,0x60000050 # 0x0f0-0x730 from the image
168 .long 0x020002d0,0x60000050 # to the range 0x0f0-0x730
169 .long 0x02000320,0x60000050 # in memory. At the end of
170 .long 0x02000370,0x60000050 # the channel program the PSW
171 .long 0x020003c0,0x60000050 # at location 0 is loaded.
172 .long 0x02000410,0x60000050 # Initial processing starts
173 .long 0x02000460,0x60000050 # at 0xf0 = iplstart.
174 .long 0x020004b0,0x60000050
175 .long 0x02000500,0x60000050
176 .long 0x02000550,0x60000050
177 .long 0x020005a0,0x60000050
178 .long 0x020005f0,0x60000050
179 .long 0x02000640,0x60000050
180 .long 0x02000690,0x60000050
181 .long 0x020006e0,0x20000050
182
183 .org 0xf0
184#
185# subroutine for loading cards from the reader
186#
187.Lloader:
188 la %r3,.Lorb # r2 = address of orb into r2
189 la %r5,.Lirb # r4 = address of irb
190 la %r6,.Lccws
191 la %r7,20
192.Linit:
193 st %r2,4(%r6) # initialize CCW data addresses
194 la %r2,0x50(%r2)
195 la %r6,8(%r6)
196 bct 7,.Linit
197
198 lctl %c6,%c6,.Lcr6 # set IO subclass mask
199 slr %r2,%r2
200.Lldlp:
201 ssch 0(%r3) # load chunk of 1600 bytes
202 bnz .Llderr
203.Lwait4irq:
204 mvc 0x78(8),.Lnewpsw # set up IO interrupt psw
205 lpsw .Lwaitpsw
206.Lioint:
207 c %r1,0xb8 # compare subchannel number
208 bne .Lwait4irq
209 tsch 0(%r5)
210
211 slr %r0,%r0
212 ic %r0,8(%r5) # get device status
213 chi %r0,8 # channel end ?
214 be .Lcont
215 chi %r0,12 # channel end + device end ?
216 be .Lcont
217
218 l %r0,4(%r5)
219 s %r0,8(%r3) # r0/8 = number of ccws executed
220 mhi %r0,10 # *10 = number of bytes in ccws
221 lh %r3,10(%r5) # get residual count
222 sr %r0,%r3 # #ccws*80-residual=#bytes read
223 ar %r2,%r0
224
225 br %r14 # r2 contains the total size
226
227.Lcont:
228 ahi %r2,0x640 # add 0x640 to total size
229 la %r6,.Lccws
230 la %r7,20
231.Lincr:
232 l %r0,4(%r6) # update CCW data addresses
233 ahi %r0,0x640
234 st %r0,4(%r6)
235 ahi %r6,8
236 bct 7,.Lincr
237
238 b .Lldlp
239.Llderr:
240 lpsw .Lcrash
241
242 .align 8
243.Lorb: .long 0x00000000,0x0080ff00,.Lccws
244.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
245.Lcr6: .long 0xff000000
246.Lloadp:.long 0,0
247 .align 8
248.Lcrash:.long 0x000a0000,0x00000000
249.Lnewpsw:
250 .long 0x00080000,0x80000000+.Lioint
251.Lwaitpsw:
252 .long 0x020a0000,0x80000000+.Lioint
253
254 .align 8
255.Lccws: .rept 19
256 .long 0x02600050,0x00000000
257 .endr
258 .long 0x02200050,0x00000000
259#endif /* CONFIG_IPL_VM */
260
261iplstart:
262 lh %r1,0xb8 # test if subchannel number
263 bct %r1,.Lnoload # is valid
264 l %r1,0xb8 # load ipl subchannel number
265 la %r2,IPL_BS # load start address
266 bas %r14,.Lloader # load rest of ipl image
267 larl %r12,_pstart # pointer to parameter area
268 st %r1,IPL_DEVICE+4-PARMAREA(%r12) # store ipl device number
269
270#
271# load parameter file from ipl device
272#
273.Lagain1:
274 l %r2,INITRD_START+4-PARMAREA(%r12)# use ramdisk location as temp
275 bas %r14,.Lloader # load parameter file
276 ltr %r2,%r2 # got anything ?
277 bz .Lnopf
278 chi %r2,895
279 bnh .Lnotrunc
280 la %r2,895
281.Lnotrunc:
282 l %r4,INITRD_START+4-PARMAREA(%r12)
283 clc 0(3,%r4),.L_hdr # if it is HDRx
284 bz .Lagain1 # skip dataset header
285 clc 0(3,%r4),.L_eof # if it is EOFx
286 bz .Lagain1 # skip dateset trailer
287 la %r5,0(%r4,%r2)
288 lr %r3,%r2
289.Lidebc:
290 tm 0(%r5),0x80 # high order bit set ?
291 bo .Ldocv # yes -> convert from EBCDIC
292 ahi %r5,-1
293 bct %r3,.Lidebc
294 b .Lnocv
295.Ldocv:
296 l %r3,.Lcvtab
297 tr 0(256,%r4),0(%r3) # convert parameters to ascii
298 tr 256(256,%r4),0(%r3)
299 tr 512(256,%r4),0(%r3)
300 tr 768(122,%r4),0(%r3)
301.Lnocv: la %r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
302 mvc 0(256,%r3),0(%r4)
303 mvc 256(256,%r3),256(%r4)
304 mvc 512(256,%r3),512(%r4)
305 mvc 768(122,%r3),768(%r4)
306 slr %r0,%r0
307 b .Lcntlp
308.Ldelspc:
309 ic %r0,0(%r2,%r3)
310 chi %r0,0x20 # is it a space ?
311 be .Lcntlp
312 ahi %r2,1
313 b .Leolp
314.Lcntlp:
315 brct %r2,.Ldelspc
316.Leolp:
317 slr %r0,%r0
318 stc %r0,0(%r2,%r3) # terminate buffer
319.Lnopf:
320
321#
322# load ramdisk from ipl device
323#
324.Lagain2:
325 l %r2,INITRD_START+4-PARMAREA(%r12)# load adr. of ramdisk
326 bas %r14,.Lloader # load ramdisk
327 st %r2,INITRD_SIZE+4-PARMAREA(%r12) # store size of ramdisk
328 ltr %r2,%r2
329 bnz .Lrdcont
330 st %r2,INITRD_START+4-PARMAREA(%r12)# no ramdisk found, null it
331.Lrdcont:
332 l %r2,INITRD_START+4-PARMAREA(%r12)
333 clc 0(3,%r2),.L_hdr # skip HDRx and EOFx
334 bz .Lagain2
335 clc 0(3,%r2),.L_eof
336 bz .Lagain2
337
338#ifdef CONFIG_IPL_VM
339#
340# reset files in VM reader
341#
342 stidp __LC_CPUID # store cpuid
343 tm __LC_CPUID,0xff # running VM ?
344 bno .Lnoreset
345 la %r2,.Lreset
346 lhi %r3,26
2b071886 347 diag %r2,%r3,8
350e3ade
HC		 348 la %r5,.Lirb
349 stsch 0(%r5) # check if irq is pending
350 tm 30(%r5),0x0f # by verifying if any of the
351 bnz .Lwaitforirq # activity or status control
352 tm 31(%r5),0xff # bits is set in the schib
353 bz .Lnoreset
354.Lwaitforirq:
2b071886
HC		 355 mvc 0x78(8),.Lrdrnewpsw # set up IO interrupt psw
356.Lwaitrdrirq:
357 lpsw .Lrdrwaitpsw
358.Lrdrint:
359 c %r1,0xb8 # compare subchannel number
360 bne .Lwaitrdrirq
361 la %r5,.Lirb
362 tsch 0(%r5)
1da177e4 363.Lnoreset:
2b071886
HC		 364 b .Lnoload
365
366 .align 8
367.Lrdrnewpsw:
368 .long 0x00080000,0x80000000+.Lrdrint
369.Lrdrwaitpsw:
370 .long 0x020a0000,0x80000000+.Lrdrint
1da177e4 371#endif
2b071886 372
1da177e4
LT		 373#
374# everything loaded, go for it
375#
376.Lnoload:
377 l %r1,.Lstartup
378 br %r1
379
380.Lstartup: .long startup
381.Lcvtab:.long _ebcasc # ebcdic to ascii table
382.Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40
383 .byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6
384 .byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold"
385.L_eof: .long 0xc5d6c600 /* C'EOF' */
386.L_hdr: .long 0xc8c4d900 /* C'HDR' */
387#endif /* CONFIG_IPL */
388
389#
390# SALIPL loader support. Based on a patch by Rob van der Heij.
391# This entry point is called directly from the SALIPL loader and
392# doesn't need a builtin ipl record.
393#
394 .org 0x800
395 .globl start
396start:
397 stm %r0,%r15,0x07b0 # store registers
398 basr %r12,%r0
399.base:
400 l %r11,.parm
401 l %r8,.cmd # pointer to command buffer
402
403 ltr %r9,%r9 # do we have SALIPL parameters?
404 bp .sk8x8
405
406 mvc 0(64,%r8),0x00b0 # copy saved registers
407 xc 64(240-64,%r8),0(%r8) # remainder of buffer
408 tr 0(64,%r8),.lowcase
409 b .gotr
410.sk8x8:
411 mvc 0(240,%r8),0(%r9) # copy iplparms into buffer
412.gotr:
413 l %r10,.tbl # EBCDIC to ASCII table
414 tr 0(240,%r8),0(%r10)
415 stidp __LC_CPUID # Are we running on VM maybe
416 cli __LC_CPUID,0xff
417 bnz .test
418 .long 0x83300060 # diag 3,0,x'0060' - storage size
419 b .done
420.test:
421 mvc 0x68(8),.pgmnw # set up pgm check handler
422 l %r2,.fourmeg
423 lr %r3,%r2
424 bctr %r3,%r0 # 4M-1
425.loop: iske %r0,%r3
426 ar %r3,%r2
427.pgmx:
428 sr %r3,%r2
429 la %r3,1(%r3)
430.done:
431 l %r1,.memsize
432 st %r3,4(%r1)
433 slr %r0,%r0
434 st %r0,INITRD_SIZE+4-PARMAREA(%r11)
435 st %r0,INITRD_START+4-PARMAREA(%r11)
436 j startup # continue with startup
437.tbl: .long _ebcasc # translate table
438.cmd: .long COMMAND_LINE # address of command line buffer
439.parm: .long PARMAREA
440.fourmeg: .long 0x00400000 # 4M
441.pgmnw: .long 0x00080000,.pgmx
442.memsize: .long memory_size
443.lowcase:
444 .byte 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07
445 .byte 0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f
446 .byte 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17
447 .byte 0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f
448 .byte 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27
449 .byte 0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f
450 .byte 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37
451 .byte 0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f
452 .byte 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47
453 .byte 0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f
454 .byte 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57
455 .byte 0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f
456 .byte 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67
457 .byte 0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f
458 .byte 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77
459 .byte 0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f
460
461 .byte 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87
462 .byte 0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f
463 .byte 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97
464 .byte 0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f
465 .byte 0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7
466 .byte 0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf
467 .byte 0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7
468 .byte 0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf
469 .byte 0xc0,0x81,0x82,0x83,0x84,0x85,0x86,0x87 # .abcdefg
470 .byte 0x88,0x89,0xca,0xcb,0xcc,0xcd,0xce,0xcf # hi
471 .byte 0xd0,0x91,0x92,0x93,0x94,0x95,0x96,0x97 # .jklmnop
472 .byte 0x98,0x99,0xda,0xdb,0xdc,0xdd,0xde,0xdf # qr
473 .byte 0xe0,0xe1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7 # ..stuvwx
474 .byte 0xa8,0xa9,0xea,0xeb,0xec,0xed,0xee,0xef # yz
475 .byte 0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7
476 .byte 0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff
477
478#
479# startup-code at 0x10000, running in real mode
480# this is called either by the ipl loader or directly by PSW restart
481# or linload or SALIPL
482#
483 .org 0x10000
484startup:basr %r13,0 # get base
485.LPG1: sll %r13,1 # remove high order bit
486 srl %r13,1
1e8e3383
HC		 487 l %r1,.Lget_ipl_device_addr-.LPG1(%r13)
488 basr %r14,%r1
1da177e4
LT		 489 lhi %r1,1 # mode 1 = esame
490 slr %r0,%r0 # set cpuid to zero
491 sigp %r1,%r0,0x12 # switch to esame mode
492 sam64 # switch to 64 bit mode
493 lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
494 larl %r12,_pstart # pointer to parameter area
495 # move IPL device to lowcore
496 mvc __LC_IPLDEV(4),IPL_DEVICE+4-PARMAREA(%r12)
497
498#
499# clear bss memory
500#
501 larl %r2,__bss_start # start of bss segment
502 larl %r3,_end # end of bss segment
503 sgr %r3,%r2 # length of bss
504 sgr %r4,%r4 #
505 sgr %r5,%r5 # set src,length and pad to zero
506 mvcle %r2,%r4,0 # clear mem
507 jo .-4 # branch back, if not finish
508
509 l %r2,.Lrcp-.LPG1(%r13) # Read SCP forced command word
510.Lservicecall:
511 stosm .Lpmask-.LPG1(%r13),0x01 # authorize ext interrupts
512
513 stctg %r0,%r0,.Lcr-.LPG1(%r13) # get cr0
514 la %r1,0x200 # set bit 22
515 og %r1,.Lcr-.LPG1(%r13) # or old cr0 with r1
516 stg %r1,.Lcr-.LPG1(%r13)
517 lctlg %r0,%r0,.Lcr-.LPG1(%r13) # load modified cr0
518
519 mvc __LC_EXT_NEW_PSW(8),.Lpcmsk-.LPG1(%r13) # set postcall psw
520 larl %r1,.Lsclph
521 stg %r1,__LC_EXT_NEW_PSW+8 # set handler
522
523 larl %r4,_pstart # %r4 is our index for sccb stuff
524 la %r1,.Lsccb-PARMAREA(%r4) # our sccb
525 .insn rre,0xb2200000,%r2,%r1 # service call
526 ipm %r1
527 srl %r1,28 # get cc code
528 xr %r3,%r3
529 chi %r1,3
530 be .Lfchunk-.LPG1(%r13) # leave
531 chi %r1,2
532 be .Lservicecall-.LPG1(%r13)
9b4554aa 533 lpswe .Lwaitsclp-.LPG1(%r13)
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LT		 534.Lsclph:
535 lh %r1,.Lsccbr-PARMAREA(%r4)
536 chi %r1,0x10 # 0x0010 is the sucess code
537 je .Lprocsccb # let's process the sccb
538 chi %r1,0x1f0
539 bne .Lfchunk-.LPG1(%r13) # unhandled error code
540 c %r2,.Lrcp-.LPG1(%r13) # Did we try Read SCP forced
541 bne .Lfchunk-.LPG1(%r13) # if no, give up
542 l %r2,.Lrcp2-.LPG1(%r13) # try with Read SCP
543 b .Lservicecall-.LPG1(%r13)
544.Lprocsccb:
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HC		 545 lghi %r1,0
546 icm %r1,3,.Lscpincr1-PARMAREA(%r4) # use this one if != 0
547 jnz .Lscnd
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LT		 548 lg %r1,.Lscpincr2-PARMAREA(%r4) # otherwise use this one
549.Lscnd:
550 xr %r3,%r3 # same logic
551 ic %r3,.Lscpa1-PARMAREA(%r4)
552 chi %r3,0x00
553 jne .Lcompmem
554 l %r3,.Lscpa2-PARMAREA(%r13)
555.Lcompmem:
556 mlgr %r2,%r1 # mem in MB on 128-bit
557 l %r1,.Lonemb-.LPG1(%r13)
558 mlgr %r2,%r1 # mem size in bytes in %r3
559 b .Lfchunk-.LPG1(%r13)
560
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HC		 561 .align 4
562.Lget_ipl_device_addr:
563 .long .Lget_ipl_device
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LT		 564.Lpmask:
565 .byte 0
566 .align 8
567.Lcr:
568 .quad 0x00 # place holder for cr0
569.Lwaitsclp:
9b4554aa 570 .quad 0x0102000180000000,.Lsclph
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LT		 571.Lrcp:
572 .int 0x00120001 # Read SCP forced code
573.Lrcp2:
574 .int 0x00020001 # Read SCP code
575.Lonemb:
576 .int 0x100000
577
578.Lfchunk:
579 # set program check new psw mask
580 mvc __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
581
582#
583# find memory chunks.
584#
585 lgr %r9,%r3 # end of mem
586 larl %r1,.Lchkmem # set program check address
587 stg %r1,__LC_PGM_NEW_PSW+8
588 la %r1,1 # test in increments of 128KB
589 sllg %r1,%r1,17
590 larl %r3,memory_chunk
591 slgr %r4,%r4 # set start of chunk to zero
592 slgr %r5,%r5 # set end of chunk to zero
593 slr %r6,%r6 # set access code to zero
594 la %r10,MEMORY_CHUNKS # number of chunks
595.Lloop:
596 tprot 0(%r5),0 # test protection of first byte
597 ipm %r7
598 srl %r7,28
599 clr %r6,%r7 # compare cc with last access code
600 je .Lsame
601 j .Lchkmem
602.Lsame:
603 algr %r5,%r1 # add 128KB to end of chunk
604 # no need to check here,
605 brc 12,.Lloop # this is the same chunk
606.Lchkmem: # > 16EB or tprot got a program check
607 clgr %r4,%r5 # chunk size > 0?
608 je .Lchkloop
609 stg %r4,0(%r3) # store start address of chunk
610 lgr %r0,%r5
611 slgr %r0,%r4
612 stg %r0,8(%r3) # store size of chunk
613 st %r6,20(%r3) # store type of chunk
614 la %r3,24(%r3)
615 larl %r8,memory_size
616 stg %r5,0(%r8) # store memory size
617 ahi %r10,-1 # update chunk number
618.Lchkloop:
619 lr %r6,%r7 # set access code to last cc
620 # we got an exception or we're starting a new
621 # chunk , we must check if we should
622 # still try to find valid memory (if we detected
623 # the amount of available storage), and if we
624 # have chunks left
625 lghi %r4,1
626 sllg %r4,%r4,31
627 clgr %r5,%r4
628 je .Lhsaskip
629 xr %r0, %r0
630 clgr %r0, %r9 # did we detect memory?
631 je .Ldonemem # if not, leave
632 chi %r10, 0 # do we have chunks left?
633 je .Ldonemem
634.Lhsaskip:
635 algr %r5,%r1 # add 128KB to end of chunk
636 lgr %r4,%r5 # potential new chunk
637 clgr %r5,%r9 # should we go on?
638 jl .Lloop
639.Ldonemem:
640
641 larl %r12,machine_flags
642#
643# find out if we are running under VM
644#
645 stidp __LC_CPUID # store cpuid
646 tm __LC_CPUID,0xff # running under VM ?
647 bno 0f-.LPG1(%r13)
648 oi 7(%r12),1 # set VM flag
6490: lh %r0,__LC_CPUID+4 # get cpu version
650 chi %r0,0x7490 # running on a P/390 ?
651 bne 1f-.LPG1(%r13)
652 oi 7(%r12),4 # set P/390 flag
6531:
654
655#
656# find out if we have the MVPG instruction
657#
658 la %r1,0f-.LPG1(%r13) # set program check address
659 stg %r1,__LC_PGM_NEW_PSW+8
660 sgr %r0,%r0
661 lghi %r1,0
662 lghi %r2,0
663 mvpg %r1,%r2 # test MVPG instruction
664 oi 7(%r12),16 # set MVPG flag
6650:
666
667#
668# find out if the diag 0x44 works in 64 bit mode
669#
670 la %r1,0f-.LPG1(%r13) # set program check address
671 stg %r1,__LC_PGM_NEW_PSW+8
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LT		 672 diag 0,0,0x44 # test diag 0x44
673 oi 7(%r12),32 # set diag44 flag
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LT		 6740:
675
676#
677# find out if we have the IDTE instruction
678#
679 la %r1,0f-.LPG1(%r13) # set program check address
680 stg %r1,__LC_PGM_NEW_PSW+8
681 .long 0xb2b10000 # store facility list
682 tm 0xc8,0x08 # check bit for clearing-by-ASCE
683 bno 0f-.LPG1(%r13)
684 lhi %r1,2094
685 lhi %r2,0
686 .long 0xb98e2001
687 oi 7(%r12),0x80 # set IDTE flag
6880:
689
690 lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space,
691 # virtual and never return ...
692 .align 16
693.Lentry:.quad 0x0000000180000000,_stext
694.Lctl: .quad 0x04b50002 # cr0: various things
695 .quad 0 # cr1: primary space segment table
696 .quad .Lduct # cr2: dispatchable unit control table
697 .quad 0 # cr3: instruction authorization
698 .quad 0 # cr4: instruction authorization
699 .quad 0xffffffffffffffff # cr5: primary-aste origin
700 .quad 0 # cr6: I/O interrupts
701 .quad 0 # cr7: secondary space segment table
702 .quad 0 # cr8: access registers translation
703 .quad 0 # cr9: tracing off
704 .quad 0 # cr10: tracing off
705 .quad 0 # cr11: tracing off
706 .quad 0 # cr12: tracing off
707 .quad 0 # cr13: home space segment table
708 .quad 0xc0000000 # cr14: machine check handling off
709 .quad 0 # cr15: linkage stack operations
710.Lpcmsk:.quad 0x0000000180000000
711.L4malign:.quad 0xffffffffffc00000
712.Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8
713.Lnop: .long 0x07000700
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LT		 714
715 .org PARMAREA-64
716.Lduct: .long 0,0,0,0,0,0,0,0
717 .long 0,0,0,0,0,0,0,0
718
719#
720# params at 10400 (setup.h)
721#
722 .org PARMAREA
723 .global _pstart
724_pstart:
725 .quad 0 # IPL_DEVICE
726 .quad RAMDISK_ORIGIN # INITRD_START
727 .quad RAMDISK_SIZE # INITRD_SIZE
728
729 .org COMMAND_LINE
730 .byte "root=/dev/ram0 ro"
731 .byte 0
732 .org 0x11000
733.Lsccb:
734 .hword 0x1000 # length, one page
735 .byte 0x00,0x00,0x00
736 .byte 0x80 # variable response bit set
737.Lsccbr:
738 .hword 0x00 # response code
739.Lscpincr1:
740 .hword 0x00
741.Lscpa1:
742 .byte 0x00
743 .fill 89,1,0
744.Lscpa2:
745 .int 0x00
746.Lscpincr2:
747 .quad 0x00
748 .fill 3984,1,0
749 .org 0x12000
750 .global _pend
751_pend:
752
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HC		 753.Lget_ipl_device:
754 basr %r12,0
755.LPG2: l %r1,0xb8 # get sid
756 sll %r1,15 # test if subchannel is enabled
757 srl %r1,31
758 ltr %r1,%r1
759 bz 0(%r14) # subchannel disabled
760 l %r1,0xb8
761 la %r5,.Lipl_schib-.LPG2(%r12)
762 stsch 0(%r5) # get schib of subchannel
763 bnz 0(%r14) # schib not available
764 tm 5(%r5),0x01 # devno valid?
765 bno 0(%r14)
766 la %r6,ipl_parameter_flags-.LPG2(%r12)
767 oi 3(%r6),0x01 # set flag
768 la %r2,ipl_devno-.LPG2(%r12)
769 mvc 0(2,%r2),6(%r5) # store devno
770 tm 4(%r5),0x80 # qdio capable device?
771 bno 0(%r14)
772 oi 3(%r6),0x02 # set flag
773
774 # copy ipl parameters
775
776 lhi %r0,4096
777 l %r2,20(%r0) # get address of parameter list
778 lhi %r3,IPL_PARMBLOCK_ORIGIN
779 st %r3,20(%r0)
780 lhi %r4,1
781 cr %r2,%r3 # start parameters < destination ?
782 jl 0f
783 lhi %r1,1 # copy direction is upwards
784 j 1f
7850: lhi %r1,-1 # copy direction is downwards
786 ar %r2,%r0
787 ar %r3,%r0
788 ar %r2,%r1
789 ar %r3,%r1
7901: mvc 0(1,%r3),0(%r2) # finally copy ipl parameters
791 ar %r3,%r1
792 ar %r2,%r1
793 sr %r0,%r4
794 jne 1b
795 b 0(%r14)
796
797 .align 4
798.Lipl_schib:
799 .rept 13
800 .long 0
801 .endr
802
803 .globl ipl_parameter_flags
804ipl_parameter_flags:
805 .long 0
806 .globl ipl_devno
807ipl_devno:
808 .word 0
809
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LT		 810#ifdef CONFIG_SHARED_KERNEL
811 .org 0x100000
812#endif
813
814#
815# startup-code, running in virtual mode
816#
817 .globl _stext
818_stext: basr %r13,0 # get base
1e8e3383 819.LPG3:
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LT		 820#
821# Setup stack
822#
823 larl %r15,init_thread_union
824 lg %r14,__TI_task(%r15) # cache current in lowcore
825 stg %r14,__LC_CURRENT
826 aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
827 stg %r15,__LC_KERNEL_STACK # set end of kernel stack
828 aghi %r15,-160
829 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
830
831# check control registers
832 stctg %c0,%c15,0(%r15)
99b2d8df 833 oi 6(%r15),0x40 # enable sigp emergency signal
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LT		 834 oi 4(%r15),0x10 # switch on low address proctection
835 lctlg %c0,%c15,0(%r15)
836
837#
1e8e3383 838 lam 0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
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LT		 839 brasl %r14,start_kernel # go to C code
840#
841# We returned from start_kernel ?!? PANIK
842#
843 basr %r13,0
844 lpswe .Ldw-.(%r13) # load disabled wait psw
845#
846 .align 8
847.Ldw: .quad 0x0002000180000000,0x0000000000000000
848.Laregs: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
849
Linux 6.x block layer and io_uring tree(s)