/arch/s390/kernel/head.S
Assembly | 772 lines | 744 code | 28 blank | 0 comment | 12 complexity | 936838501794c4f08b16b7e5e45738dc MD5 | raw file
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> 33#include <asm/offsets.h> 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 __LC_IO_NEW_PSW(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 l %r12,.Lparm # pointer to parameter area 268 st %r1,IPL_DEVICE-PARMAREA(%r12) # store ipl device number 269 270# 271# load parameter file from ipl device 272# 273.Lagain1: 274 l %r2,INITRD_START-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-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-PARMAREA(%r12) # load adr. of ramdisk 326 bas %r14,.Lloader # load ramdisk 327 st %r2,INITRD_SIZE-PARMAREA(%r12) # store size of ramdisk 328 ltr %r2,%r2 329 bnz .Lrdcont 330 st %r2,INITRD_START-PARMAREA(%r12) # no ramdisk found, null it 331.Lrdcont: 332 l %r2,INITRD_START-PARMAREA(%r12) 333 334 clc 0(3,%r2),.L_hdr # skip HDRx and EOFx 335 bz .Lagain2 336 clc 0(3,%r2),.L_eof 337 bz .Lagain2 338 339#ifdef CONFIG_IPL_VM 340# 341# reset files in VM reader 342# 343 stidp __LC_CPUID # store cpuid 344 tm __LC_CPUID,0xff # running VM ? 345 bno .Lnoreset 346 la %r2,.Lreset 347 lhi %r3,26 348 .long 0x83230008 349.Lnoreset: 350#endif 351 352# 353# everything loaded, go for it 354# 355.Lnoload: 356 l %r1,.Lstartup 357 br %r1 358 359.Lparm: .long PARMAREA 360.Lstartup: .long startup 361.Lcvtab:.long _ebcasc # ebcdic to ascii table 362.Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40 363 .byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6 364 .byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold" 365.L_eof: .long 0xc5d6c600 /* C'EOF' */ 366.L_hdr: .long 0xc8c4d900 /* C'HDR' */ 367 368#endif /* CONFIG_IPL */ 369 370# 371# SALIPL loader support. Based on a patch by Rob van der Heij. 372# This entry point is called directly from the SALIPL loader and 373# doesn't need a builtin ipl record. 374# 375 .org 0x800 376 .globl start 377start: 378 stm %r0,%r15,0x07b0 # store registers 379 basr %r12,%r0 380.base: 381 l %r11,.parm 382 l %r8,.cmd # pointer to command buffer 383 384 ltr %r9,%r9 # do we have SALIPL parameters? 385 bp .sk8x8 386 387 mvc 0(64,%r8),0x00b0 # copy saved registers 388 xc 64(240-64,%r8),0(%r8) # remainder of buffer 389 tr 0(64,%r8),.lowcase 390 b .gotr 391.sk8x8: 392 mvc 0(240,%r8),0(%r9) # copy iplparms into buffer 393.gotr: 394 l %r10,.tbl # EBCDIC to ASCII table 395 tr 0(240,%r8),0(%r10) 396 stidp __LC_CPUID # Are we running on VM maybe 397 cli __LC_CPUID,0xff 398 bnz .test 399 .long 0x83300060 # diag 3,0,x'0060' - storage size 400 b .done 401.test: 402 mvc 0x68(8),.pgmnw # set up pgm check handler 403 l %r2,.fourmeg 404 lr %r3,%r2 405 bctr %r3,%r0 # 4M-1 406.loop: iske %r0,%r3 407 ar %r3,%r2 408.pgmx: 409 sr %r3,%r2 410 la %r3,1(%r3) 411.done: 412 l %r1,.memsize 413 st %r3,0(%r1) 414 slr %r0,%r0 415 st %r0,INITRD_SIZE-PARMAREA(%r11) 416 st %r0,INITRD_START-PARMAREA(%r11) 417 j startup # continue with startup 418.tbl: .long _ebcasc # translate table 419.cmd: .long COMMAND_LINE # address of command line buffer 420.parm: .long PARMAREA 421.memsize: .long memory_size 422.fourmeg: .long 0x00400000 # 4M 423.pgmnw: .long 0x00080000,.pgmx 424.lowcase: 425 .byte 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07 426 .byte 0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f 427 .byte 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17 428 .byte 0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f 429 .byte 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27 430 .byte 0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f 431 .byte 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37 432 .byte 0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f 433 .byte 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47 434 .byte 0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f 435 .byte 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57 436 .byte 0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f 437 .byte 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67 438 .byte 0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f 439 .byte 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77 440 .byte 0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f 441 442 .byte 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87 443 .byte 0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f 444 .byte 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97 445 .byte 0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f 446 .byte 0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7 447 .byte 0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf 448 .byte 0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7 449 .byte 0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf 450 .byte 0xc0,0x81,0x82,0x83,0x84,0x85,0x86,0x87 # .abcdefg 451 .byte 0x88,0x89,0xca,0xcb,0xcc,0xcd,0xce,0xcf # hi 452 .byte 0xd0,0x91,0x92,0x93,0x94,0x95,0x96,0x97 # .jklmnop 453 .byte 0x98,0x99,0xda,0xdb,0xdc,0xdd,0xde,0xdf # qr 454 .byte 0xe0,0xe1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7 # ..stuvwx 455 .byte 0xa8,0xa9,0xea,0xeb,0xec,0xed,0xee,0xef # yz 456 .byte 0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7 457 .byte 0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff 458 459# 460# startup-code at 0x10000, running in real mode 461# this is called either by the ipl loader or directly by PSW restart 462# or linload or SALIPL 463# 464 .org 0x10000 465startup:basr %r13,0 # get base 466.LPG1: lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers 467 la %r12,_pstart-.LPG1(%r13) # pointer to parameter area 468 # move IPL device to lowcore 469 mvc __LC_IPLDEV(4),IPL_DEVICE-PARMAREA(%r12) 470 471# 472# clear bss memory 473# 474 l %r2,.Lbss_bgn-.LPG1(%r13) # start of bss 475 l %r3,.Lbss_end-.LPG1(%r13) # end of bss 476 sr %r3,%r2 # length of bss 477 sr %r4,%r4 # 478 sr %r5,%r5 # set src,length and pad to zero 479 sr %r0,%r0 # 480 mvcle %r2,%r4,0 # clear mem 481 jo .-4 # branch back, if not finish 482 483 l %r2,.Lrcp-.LPG1(%r13) # Read SCP forced command word 484.Lservicecall: 485 stosm .Lpmask-.LPG1(%r13),0x01 # authorize ext interrupts 486 487 stctl %r0, %r0,.Lcr-.LPG1(%r13) # get cr0 488 la %r1,0x200 # set bit 22 489 o %r1,.Lcr-.LPG1(%r13) # or old cr0 with r1 490 st %r1,.Lcr-.LPG1(%r13) 491 lctl %r0, %r0,.Lcr-.LPG1(%r13) # load modified cr0 492 493 mvc __LC_EXT_NEW_PSW(8),.Lpcext-.LPG1(%r13) # set postcall psw 494 la %r1, .Lsclph-.LPG1(%r13) 495 a %r1,__LC_EXT_NEW_PSW+4 # set handler 496 st %r1,__LC_EXT_NEW_PSW+4 497 498 la %r4,_pstart-.LPG1(%r13) # %r4 is our index for sccb stuff 499 la %r1, .Lsccb-PARMAREA(%r4) # our sccb 500 .insn rre,0xb2200000,%r2,%r1 # service call 501 ipm %r1 502 srl %r1,28 # get cc code 503 xr %r3, %r3 504 chi %r1,3 505 be .Lfchunk-.LPG1(%r13) # leave 506 chi %r1,2 507 be .Lservicecall-.LPG1(%r13) 508 lpsw .Lwaitsclp-.LPG1(%r13) 509.Lsclph: 510 lh %r1,.Lsccbr-PARMAREA(%r4) 511 chi %r1,0x10 # 0x0010 is the sucess code 512 je .Lprocsccb # let's process the sccb 513 chi %r1,0x1f0 514 bne .Lfchunk-.LPG1(%r13) # unhandled error code 515 c %r2, .Lrcp-.LPG1(%r13) # Did we try Read SCP forced 516 bne .Lfchunk-.LPG1(%r13) # if no, give up 517 l %r2, .Lrcp2-.LPG1(%r13) # try with Read SCP 518 b .Lservicecall-.LPG1(%r13) 519.Lprocsccb: 520 lh %r1,.Lscpincr1-PARMAREA(%r4) # use this one if != 0 521 chi %r1,0x00 522 jne .Lscnd 523 l %r1,.Lscpincr2-PARMAREA(%r4) # otherwise use this one 524.Lscnd: 525 xr %r3,%r3 # same logic 526 ic %r3,.Lscpa1-PARMAREA(%r4) 527 chi %r3,0x00 528 jne .Lcompmem 529 l %r3,.Lscpa2-PARMAREA(%r13) 530.Lcompmem: 531 mr %r2,%r1 # mem in MB on 128-bit 532 l %r1,.Lonemb-.LPG1(%r13) 533 mr %r2,%r1 # mem size in bytes in %r3 534 b .Lfchunk-.LPG1(%r13) 535 536.Lpmask: 537 .byte 0 538.align 8 539.Lpcext:.long 0x00080000,0x80000000 540.Lcr: 541 .long 0x00 # place holder for cr0 542.Lwaitsclp: 543 .long 0x020A0000 544 .long .Lsclph 545.Lrcp: 546 .int 0x00120001 # Read SCP forced code 547.Lrcp2: 548 .int 0x00020001 # Read SCP code 549.Lonemb: 550 .int 0x100000 551.Lfchunk: 552 553# 554# find memory chunks. 555# 556 lr %r9,%r3 # end of mem 557 mvc __LC_PGM_NEW_PSW(8),.Lpcmem-.LPG1(%r13) 558 la %r1,1 # test in increments of 128KB 559 sll %r1,17 560 l %r3,.Lmchunk-.LPG1(%r13) # get pointer to memory_chunk array 561 slr %r4,%r4 # set start of chunk to zero 562 slr %r5,%r5 # set end of chunk to zero 563 slr %r6,%r6 # set access code to zero 564 la %r10, MEMORY_CHUNKS # number of chunks 565.Lloop: 566 tprot 0(%r5),0 # test protection of first byte 567 ipm %r7 568 srl %r7,28 569 clr %r6,%r7 # compare cc with last access code 570 be .Lsame-.LPG1(%r13) 571 b .Lchkmem-.LPG1(%r13) 572.Lsame: 573 ar %r5,%r1 # add 128KB to end of chunk 574 bno .Lloop-.LPG1(%r13) # r1 < 0x80000000 -> loop 575.Lchkmem: # > 2GB or tprot got a program check 576 clr %r4,%r5 # chunk size > 0? 577 be .Lchkloop-.LPG1(%r13) 578 st %r4,0(%r3) # store start address of chunk 579 lr %r0,%r5 580 slr %r0,%r4 581 st %r0,4(%r3) # store size of chunk 582 st %r6,8(%r3) # store type of chunk 583 la %r3,12(%r3) 584 l %r4,.Lmemsize-.LPG1(%r13) # address of variable memory_size 585 st %r5,0(%r4) # store last end to memory size 586 ahi %r10,-1 # update chunk number 587.Lchkloop: 588 lr %r6,%r7 # set access code to last cc 589 # we got an exception or we're starting a new 590 # chunk , we must check if we should 591 # still try to find valid memory (if we detected 592 # the amount of available storage), and if we 593 # have chunks left 594 xr %r0,%r0 595 clr %r0,%r9 # did we detect memory? 596 je .Ldonemem # if not, leave 597 chi %r10,0 # do we have chunks left? 598 je .Ldonemem 599 alr %r5,%r1 # add 128KB to end of chunk 600 lr %r4,%r5 # potential new chunk 601 clr %r5,%r9 # should we go on? 602 jl .Lloop 603.Ldonemem: 604 l %r12,.Lmflags-.LPG1(%r13) # get address of machine_flags 605# 606# find out if we are running under VM 607# 608 stidp __LC_CPUID # store cpuid 609 tm __LC_CPUID,0xff # running under VM ? 610 bno .Lnovm-.LPG1(%r13) 611 oi 3(%r12),1 # set VM flag 612.Lnovm: 613 lh %r0,__LC_CPUID+4 # get cpu version 614 chi %r0,0x7490 # running on a P/390 ? 615 bne .Lnop390-.LPG1(%r13) 616 oi 3(%r12),4 # set P/390 flag 617.Lnop390: 618 619# 620# find out if we have an IEEE fpu 621# 622 mvc __LC_PGM_NEW_PSW(8),.Lpcfpu-.LPG1(%r13) 623 efpc %r0,0 # test IEEE extract fpc instruction 624 oi 3(%r12),2 # set IEEE fpu flag 625.Lchkfpu: 626 627# 628# find out if we have the CSP instruction 629# 630 mvc __LC_PGM_NEW_PSW(8),.Lpccsp-.LPG1(%r13) 631 la %r0,0 632 lr %r1,%r0 633 la %r2,4 634 csp %r0,%r2 # Test CSP instruction 635 oi 3(%r12),8 # set CSP flag 636.Lchkcsp: 637 638# 639# find out if we have the MVPG instruction 640# 641 mvc __LC_PGM_NEW_PSW(8),.Lpcmvpg-.LPG1(%r13) 642 sr %r0,%r0 643 la %r1,0 644 la %r2,0 645 mvpg %r1,%r2 # Test CSP instruction 646 oi 3(%r12),16 # set MVPG flag 647.Lchkmvpg: 648 649# 650# find out if we have the IDTE instruction 651# 652 mvc __LC_PGM_NEW_PSW(8),.Lpcidte-.LPG1(%r13) 653 .long 0xb2b10000 # store facility list 654 tm 0xc8,0x08 # check bit for clearing-by-ASCE 655 bno .Lchkidte-.LPG1(%r13) 656 lhi %r1,2094 657 lhi %r2,0 658 .long 0xb98e2001 659 oi 3(%r12),0x80 # set IDTE flag 660.Lchkidte: 661 662 lpsw .Lentry-.LPG1(13) # jump to _stext in primary-space, 663 # virtual and never return ... 664 .align 8 665.Lentry:.long 0x00080000,0x80000000 + _stext 666.Lctl: .long 0x04b50002 # cr0: various things 667 .long 0 # cr1: primary space segment table 668 .long .Lduct # cr2: dispatchable unit control table 669 .long 0 # cr3: instruction authorization 670 .long 0 # cr4: instruction authorization 671 .long 0xffffffff # cr5: primary-aste origin 672 .long 0 # cr6: I/O interrupts 673 .long 0 # cr7: secondary space segment table 674 .long 0 # cr8: access registers translation 675 .long 0 # cr9: tracing off 676 .long 0 # cr10: tracing off 677 .long 0 # cr11: tracing off 678 .long 0 # cr12: tracing off 679 .long 0 # cr13: home space segment table 680 .long 0xc0000000 # cr14: machine check handling off 681 .long 0 # cr15: linkage stack operations 682.Lpcmem:.long 0x00080000,0x80000000 + .Lchkmem 683.Lpcfpu:.long 0x00080000,0x80000000 + .Lchkfpu 684.Lpccsp:.long 0x00080000,0x80000000 + .Lchkcsp 685.Lpcmvpg:.long 0x00080000,0x80000000 + .Lchkmvpg 686.Lpcidte:.long 0x00080000,0x80000000 + .Lchkidte 687.Lmemsize:.long memory_size 688.Lmchunk:.long memory_chunk 689.Lmflags:.long machine_flags 690.Lbss_bgn: .long __bss_start 691.Lbss_end: .long _end 692 693 .org PARMAREA-64 694.Lduct: .long 0,0,0,0,0,0,0,0 695 .long 0,0,0,0,0,0,0,0 696 697# 698# params at 10400 (setup.h) 699# 700 .org PARMAREA 701 .global _pstart 702_pstart: 703 .long 0,0 # IPL_DEVICE 704 .long 0,RAMDISK_ORIGIN # INITRD_START 705 .long 0,RAMDISK_SIZE # INITRD_SIZE 706 707 .org COMMAND_LINE 708 .byte "root=/dev/ram0 ro" 709 .byte 0 710 .org 0x11000 711.Lsccb: 712 .hword 0x1000 # length, one page 713 .byte 0x00,0x00,0x00 714 .byte 0x80 # variable response bit set 715.Lsccbr: 716 .hword 0x00 # response code 717.Lscpincr1: 718 .hword 0x00 719.Lscpa1: 720 .byte 0x00 721 .fill 89,1,0 722.Lscpa2: 723 .int 0x00 724.Lscpincr2: 725 .quad 0x00 726 .fill 3984,1,0 727 .org 0x12000 728 .global _pend 729_pend: 730 731#ifdef CONFIG_SHARED_KERNEL 732 .org 0x100000 733#endif 734 735# 736# startup-code, running in virtual mode 737# 738 .globl _stext 739_stext: basr %r13,0 # get base 740.LPG2: 741# 742# Setup stack 743# 744 l %r15,.Linittu-.LPG2(%r13) 745 mvc __LC_CURRENT(4),__TI_task(%r15) 746 ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE 747 st %r15,__LC_KERNEL_STACK # set end of kernel stack 748 ahi %r15,-96 749 xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain 750 751# check control registers 752 stctl %c0,%c15,0(%r15) 753 oi 2(%r15),0x20 # enable sigp external interrupts 754 oi 0(%r15),0x10 # switch on low address protection 755 lctl %c0,%c15,0(%r15) 756 757# 758 lam 0,15,.Laregs-.LPG2(%r13) # load access regs needed by uaccess 759 l %r14,.Lstart-.LPG2(%r13) 760 basr %r14,%r14 # call start_kernel 761# 762# We returned from start_kernel ?!? PANIK 763# 764 basr %r13,0 765 lpsw .Ldw-.(%r13) # load disabled wait psw 766# 767 .align 8 768.Ldw: .long 0x000a0000,0x00000000 769.Linittu: .long init_thread_union 770.Lstart: .long start_kernel 771.Laregs: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 772