1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Copyright IBM Corp. 1999, 2010 4 * 5 * Author(s): Hartmut Penner <hp@de.ibm.com> 6 * Martin Schwidefsky <schwidefsky@de.ibm.com> 7 * Rob van der Heij <rvdhei@iae.nl> 8 * Heiko Carstens <heiko.carstens@de.ibm.com> 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 */ 24 25#include <linux/init.h> 26#include <linux/linkage.h> 27#include <asm/asm-offsets.h> 28#include <asm/thread_info.h> 29#include <asm/page.h> 30#include <asm/ptrace.h> 31#include "boot.h" 32 33#define ARCH_OFFSET 4 34 35__HEAD 36 37#define IPL_BS 0x730 38 .org 0 39 .long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded 40 .long 0x02000018,0x60000050 # by ipl to addresses 0-23. 41 .long 0x02000068,0x60000050 # (a PSW and two CCWs). 42 .fill 80-24,1,0x40 # bytes 24-79 are discarded !! 43 .long 0x020000f0,0x60000050 # The next 160 byte are loaded 44 .long 0x02000140,0x60000050 # to addresses 0x18-0xb7 45 .long 0x02000190,0x60000050 # They form the continuation 46 .long 0x020001e0,0x60000050 # of the CCW program started 47 .long 0x02000230,0x60000050 # by ipl and load the range 48 .long 0x02000280,0x60000050 # 0x0f0-0x730 from the image 49 .long 0x020002d0,0x60000050 # to the range 0x0f0-0x730 50 .long 0x02000320,0x60000050 # in memory. At the end of 51 .long 0x02000370,0x60000050 # the channel program the PSW 52 .long 0x020003c0,0x60000050 # at location 0 is loaded. 53 .long 0x02000410,0x60000050 # Initial processing starts 54 .long 0x02000460,0x60000050 # at 0x200 = iplstart. 55 .long 0x020004b0,0x60000050 56 .long 0x02000500,0x60000050 57 .long 0x02000550,0x60000050 58 .long 0x020005a0,0x60000050 59 .long 0x020005f0,0x60000050 60 .long 0x02000640,0x60000050 61 .long 0x02000690,0x60000050 62 .long 0x020006e0,0x20000050 63 64 .org __LC_RST_NEW_PSW # 0x1a0 65 .quad 0,iplstart 66 .org __LC_EXT_NEW_PSW # 0x1b0 67 .quad 0x0002000180000000,0x1b0 # disabled wait 68 .org __LC_PGM_NEW_PSW # 0x1d0 69 .quad 0x0000000180000000,startup_pgm_check_handler 70 .org __LC_IO_NEW_PSW # 0x1f0 71 .quad 0x0002000180000000,0x1f0 # disabled wait 72 73 .org 0x200 74 75# 76# subroutine to wait for end I/O 77# 78.Lirqwait: 79 mvc __LC_IO_NEW_PSW(16),.Lnewpsw # set up IO interrupt psw 80 lpsw .Lwaitpsw 81.Lioint: 82 br %r14 83 .align 8 84.Lnewpsw: 85 .quad 0x0000000080000000,.Lioint 86.Lwaitpsw: 87 .long 0x020a0000,0x80000000+.Lioint 88 89# 90# subroutine for loading cards from the reader 91# 92.Lloader: 93 la %r4,0(%r14) 94 la %r3,.Lorb # r2 = address of orb into r2 95 la %r5,.Lirb # r4 = address of irb 96 la %r6,.Lccws 97 la %r7,20 98.Linit: 99 st %r2,4(%r6) # initialize CCW data addresses 100 la %r2,0x50(%r2) 101 la %r6,8(%r6) 102 bct 7,.Linit 103 104 lctl %c6,%c6,.Lcr6 # set IO subclass mask 105 slr %r2,%r2 106.Lldlp: 107 ssch 0(%r3) # load chunk of 1600 bytes 108 bnz .Llderr 109.Lwait4irq: 110 bas %r14,.Lirqwait 111 c %r1,__LC_SUBCHANNEL_ID # compare subchannel number 112 bne .Lwait4irq 113 tsch 0(%r5) 114 115 slr %r0,%r0 116 ic %r0,8(%r5) # get device status 117 chi %r0,8 # channel end ? 118 be .Lcont 119 chi %r0,12 # channel end + device end ? 120 be .Lcont 121 122 l %r0,4(%r5) 123 s %r0,8(%r3) # r0/8 = number of ccws executed 124 mhi %r0,10 # *10 = number of bytes in ccws 125 lh %r3,10(%r5) # get residual count 126 sr %r0,%r3 # #ccws*80-residual=#bytes read 127 ar %r2,%r0 128 129 br %r4 # r2 contains the total size 130 131.Lcont: 132 ahi %r2,0x640 # add 0x640 to total size 133 la %r6,.Lccws 134 la %r7,20 135.Lincr: 136 l %r0,4(%r6) # update CCW data addresses 137 ahi %r0,0x640 138 st %r0,4(%r6) 139 ahi %r6,8 140 bct 7,.Lincr 141 142 b .Lldlp 143.Llderr: 144 lpsw .Lcrash 145 146 .align 8 147.Lorb: .long 0x00000000,0x0080ff00,.Lccws 148.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 149.Lcr6: .long 0xff000000 150.Lloadp:.long 0,0 151 .align 8 152.Lcrash:.long 0x000a0000,0x00000000 153 154 .align 8 155.Lccws: .rept 19 156 .long 0x02600050,0x00000000 157 .endr 158 .long 0x02200050,0x00000000 159 160iplstart: 161 mvi __LC_AR_MODE_ID,1 # set esame flag 162 slr %r0,%r0 # set cpuid to zero 163 lhi %r1,2 # mode 2 = esame (dump) 164 sigp %r1,%r0,0x12 # switch to esame mode 165 bras %r13,0f 166 .fill 16,4,0x0 1670: lmh %r0,%r15,0(%r13) # clear high-order half of gprs 168 sam31 # switch to 31 bit addressing mode 169 lh %r1,__LC_SUBCHANNEL_ID # test if subchannel number 170 bct %r1,.Lnoload # is valid 171 l %r1,__LC_SUBCHANNEL_ID # load ipl subchannel number 172 la %r2,IPL_BS # load start address 173 bas %r14,.Lloader # load rest of ipl image 174 l %r12,.Lparm # pointer to parameter area 175 st %r1,IPL_DEVICE+ARCH_OFFSET-PARMAREA(%r12) # save ipl device number 176 177# 178# load parameter file from ipl device 179# 180.Lagain1: 181 l %r2,.Linitrd # ramdisk loc. is temp 182 bas %r14,.Lloader # load parameter file 183 ltr %r2,%r2 # got anything ? 184 bz .Lnopf 185 chi %r2,895 186 bnh .Lnotrunc 187 la %r2,895 188.Lnotrunc: 189 l %r4,.Linitrd 190 clc 0(3,%r4),.L_hdr # if it is HDRx 191 bz .Lagain1 # skip dataset header 192 clc 0(3,%r4),.L_eof # if it is EOFx 193 bz .Lagain1 # skip dateset trailer 194 la %r5,0(%r4,%r2) 195 lr %r3,%r2 196 la %r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line 197 mvc 0(256,%r3),0(%r4) 198 mvc 256(256,%r3),256(%r4) 199 mvc 512(256,%r3),512(%r4) 200 mvc 768(122,%r3),768(%r4) 201 slr %r0,%r0 202 b .Lcntlp 203.Ldelspc: 204 ic %r0,0(%r2,%r3) 205 chi %r0,0x20 # is it a space ? 206 be .Lcntlp 207 ahi %r2,1 208 b .Leolp 209.Lcntlp: 210 brct %r2,.Ldelspc 211.Leolp: 212 slr %r0,%r0 213 stc %r0,0(%r2,%r3) # terminate buffer 214.Lnopf: 215 216# 217# load ramdisk from ipl device 218# 219.Lagain2: 220 l %r2,.Linitrd # addr of ramdisk 221 st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) 222 bas %r14,.Lloader # load ramdisk 223 st %r2,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r12) # store size of rd 224 ltr %r2,%r2 225 bnz .Lrdcont 226 st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # no ramdisk found 227.Lrdcont: 228 l %r2,.Linitrd 229 230 clc 0(3,%r2),.L_hdr # skip HDRx and EOFx 231 bz .Lagain2 232 clc 0(3,%r2),.L_eof 233 bz .Lagain2 234 235# 236# reset files in VM reader 237# 238 stidp .Lcpuid # store cpuid 239 tm .Lcpuid,0xff # running VM ? 240 bno .Lnoreset 241 la %r2,.Lreset 242 lhi %r3,26 243 diag %r2,%r3,8 244 la %r5,.Lirb 245 stsch 0(%r5) # check if irq is pending 246 tm 30(%r5),0x0f # by verifying if any of the 247 bnz .Lwaitforirq # activity or status control 248 tm 31(%r5),0xff # bits is set in the schib 249 bz .Lnoreset 250.Lwaitforirq: 251 bas %r14,.Lirqwait # wait for IO interrupt 252 c %r1,__LC_SUBCHANNEL_ID # compare subchannel number 253 bne .Lwaitforirq 254 la %r5,.Lirb 255 tsch 0(%r5) 256.Lnoreset: 257 b .Lnoload 258 259# 260# everything loaded, go for it 261# 262.Lnoload: 263 l %r1,.Lstartup 264 br %r1 265 266.Linitrd:.long _end # default address of initrd 267.Lparm: .long PARMAREA 268.Lstartup: .long startup 269.Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40 270 .byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6 271 .byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold" 272.L_eof: .long 0xc5d6c600 /* C'EOF' */ 273.L_hdr: .long 0xc8c4d900 /* C'HDR' */ 274 .align 8 275.Lcpuid:.fill 8,1,0 276 277# 278# startup-code at 0x10000, running in absolute addressing mode 279# this is called either by the ipl loader or directly by PSW restart 280# or linload or SALIPL 281# 282 .org 0x10000 283SYM_CODE_START(startup) 284 j startup_normal 285 .org EP_OFFSET 286# 287# This is a list of s390 kernel entry points. At address 0x1000f the number of 288# valid entry points is stored. 289# 290# IMPORTANT: Do not change this table, it is s390 kernel ABI! 291# 292 .ascii EP_STRING 293 .byte 0x00,0x01 294# 295# kdump startup-code at 0x10010, running in 64 bit absolute addressing mode 296# 297 .org 0x10010 298 j startup_kdump 299SYM_CODE_END(startup) 300SYM_CODE_START_LOCAL(startup_normal) 301 mvi __LC_AR_MODE_ID,1 # set esame flag 302 slr %r0,%r0 # set cpuid to zero 303 lhi %r1,2 # mode 2 = esame (dump) 304 sigp %r1,%r0,0x12 # switch to esame mode 305 bras %r13,0f 306 .fill 16,4,0x0 3070: lmh %r0,%r15,0(%r13) # clear high-order half of gprs 308 sam64 # switch to 64 bit addressing mode 309 basr %r13,0 # get base 310.LPG0: 311 mvc __LC_EXT_NEW_PSW(16),.Lext_new_psw-.LPG0(%r13) 312 mvc __LC_PGM_NEW_PSW(16),.Lpgm_new_psw-.LPG0(%r13) 313 mvc __LC_IO_NEW_PSW(16),.Lio_new_psw-.LPG0(%r13) 314 xc 0x200(256),0x200 # partially clear lowcore 315 xc 0x300(256),0x300 316 xc 0xe00(256),0xe00 317 xc 0xf00(256),0xf00 318 lctlg %c0,%c15,.Lctl-.LPG0(%r13) # load control registers 319 stcke __LC_BOOT_CLOCK 320 mvc __LC_LAST_UPDATE_CLOCK(8),__LC_BOOT_CLOCK+1 321 spt 6f-.LPG0(%r13) 322 mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13) 323 l %r15,.Lstack-.LPG0(%r13) 324 brasl %r14,verify_facilities 325 brasl %r14,startup_kernel 326SYM_CODE_END(startup_normal) 327 328.Lstack: 329 .long BOOT_STACK_OFFSET + BOOT_STACK_SIZE - STACK_FRAME_OVERHEAD 330 .align 8 3316: .long 0x7fffffff,0xffffffff 332.Lext_new_psw: 333 .quad 0x0002000180000000,0x1b0 # disabled wait 334.Lpgm_new_psw: 335 .quad 0x0000000180000000,startup_pgm_check_handler 336.Lio_new_psw: 337 .quad 0x0002000180000000,0x1f0 # disabled wait 338.Lctl: .quad 0x04040000 # cr0: AFP registers & secondary space 339 .quad 0 # cr1: primary space segment table 340 .quad .Lduct # cr2: dispatchable unit control table 341 .quad 0 # cr3: instruction authorization 342 .quad 0xffff # cr4: instruction authorization 343 .quad .Lduct # cr5: primary-aste origin 344 .quad 0 # cr6: I/O interrupts 345 .quad 0 # cr7: secondary space segment table 346 .quad 0x0000000000008000 # cr8: access registers translation 347 .quad 0 # cr9: tracing off 348 .quad 0 # cr10: tracing off 349 .quad 0 # cr11: tracing off 350 .quad 0 # cr12: tracing off 351 .quad 0 # cr13: home space segment table 352 .quad 0xc0000000 # cr14: machine check handling off 353 .quad .Llinkage_stack # cr15: linkage stack operations 354 355 .section .dma.data,"aw",@progbits 356.Lduct: .long 0,.Laste,.Laste,0,.Lduald,0,0,0 357 .long 0,0,0,0,0,0,0,0 358.Llinkage_stack: 359 .long 0,0,0x89000000,0,0,0,0x8a000000,0 360 .align 64 361.Laste: .quad 0,0xffffffffffffffff,0,0,0,0,0,0 362 .align 128 363.Lduald:.rept 8 364 .long 0x80000000,0,0,0 # invalid access-list entries 365 .endr 366 .previous 367 368#include "head_kdump.S" 369 370# 371# This program check is active immediately after kernel start 372# and until early_pgm_check_handler is set in kernel/early.c 373# It simply saves general/control registers and psw in 374# the save area and does disabled wait with a faulty address. 375# 376SYM_CODE_START_LOCAL(startup_pgm_check_handler) 377 stmg %r8,%r15,__LC_SAVE_AREA_SYNC 378 la %r8,4095 379 stctg %c0,%c15,__LC_CREGS_SAVE_AREA-4095(%r8) 380 stmg %r0,%r7,__LC_GPREGS_SAVE_AREA-4095(%r8) 381 mvc __LC_GPREGS_SAVE_AREA-4095+64(64,%r8),__LC_SAVE_AREA_SYNC 382 mvc __LC_PSW_SAVE_AREA-4095(16,%r8),__LC_PGM_OLD_PSW 383 mvc __LC_RETURN_PSW(16),__LC_PGM_OLD_PSW 384 ni __LC_RETURN_PSW,0xfc # remove IO and EX bits 385 ni __LC_RETURN_PSW+1,0xfb # remove MCHK bit 386 oi __LC_RETURN_PSW+1,0x2 # set wait state bit 387 larl %r9,.Lold_psw_disabled_wait 388 stg %r9,__LC_PGM_NEW_PSW+8 389 l %r15,.Ldump_info_stack-.Lold_psw_disabled_wait(%r9) 390 brasl %r14,print_pgm_check_info 391.Lold_psw_disabled_wait: 392 la %r8,4095 393 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r8) 394 lpswe __LC_RETURN_PSW # disabled wait 395SYM_CODE_END(startup_pgm_check_handler) 396.Ldump_info_stack: 397 .long 0x5000 + PAGE_SIZE - STACK_FRAME_OVERHEAD 398 399# 400# params at 10400 (setup.h) 401# Must be keept in sync with struct parmarea in setup.h 402# 403 .org PARMAREA 404SYM_DATA_START(parmarea) 405 .quad 0 # IPL_DEVICE 406 .quad 0 # INITRD_START 407 .quad 0 # INITRD_SIZE 408 .quad 0 # OLDMEM_BASE 409 .quad 0 # OLDMEM_SIZE 410 .quad kernel_version # points to kernel version string 411 412 .org COMMAND_LINE 413 .byte "root=/dev/ram0 ro" 414 .byte 0 415 .org PARMAREA+__PARMAREA_SIZE 416SYM_DATA_END(parmarea) 417 418 .org EARLY_SCCB_OFFSET 419 .fill 4096 420 421 .org HEAD_END 422