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 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 __LC_IO_NEW_PSW(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,__LC_SUBCHANNEL_ID # 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,__LC_SUBCHANNEL_ID # test if subchannel number 160 bct %r1,.Lnoload # is valid 161 l %r1,__LC_SUBCHANNEL_ID # 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,__LC_SUBCHANNEL_ID # 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 EP_OFFSET 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 EP_STRING 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 stcke __LC_BOOT_CLOCK 307 mvc __LC_LAST_UPDATE_CLOCK(8),__LC_BOOT_CLOCK+1 308 spt 6f-.LPG0(%r13) 309 mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13) 310 l %r15,.Lstack-.LPG0(%r13) 311 ahi %r15,-STACK_FRAME_OVERHEAD 312 brasl %r14,verify_facilities 313#ifdef CONFIG_KERNEL_UNCOMPRESSED 314 jg startup_continue 315#else 316 jg startup_decompressor 317#endif 318 319.Lstack: 320 .long 0x8000 + (1<<(PAGE_SHIFT+THREAD_SIZE_ORDER)) 321 .align 8 3226: .long 0x7fffffff,0xffffffff 323 324#include "head_kdump.S" 325 326# 327# params at 10400 (setup.h) 328# 329 .org PARMAREA 330 .long 0,0 # IPL_DEVICE 331 .long 0,0 # INITRD_START 332 .long 0,0 # INITRD_SIZE 333 .long 0,0 # OLDMEM_BASE 334 .long 0,0 # OLDMEM_SIZE 335 336 .org COMMAND_LINE 337 .byte "root=/dev/ram0 ro" 338 .byte 0 339 340 .org 0x11000 341