head.S (9081B)
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 * 9 * There are 5 different IPL methods 10 * 1) load the image directly into ram at address 0 and do an PSW restart 11 * 2) linload will load the image from address 0x10000 to memory 0x10000 12 * and start the code thru LPSW 0x0008000080010000 (VM only, deprecated) 13 * 3) generate the tape ipl header, store the generated image on a tape 14 * and ipl from it 15 * In case of SL tape you need to IPL 5 times to get past VOL1 etc 16 * 4) generate the vm reader ipl header, move the generated image to the 17 * VM reader (use option NOH!) and do a ipl from reader (VM only) 18 * 5) direct call of start by the SALIPL loader 19 * We use the cpuid to distinguish between VM and native ipl 20 * params for kernel are pushed to 0x10400 (see setup.h) 21 * 22 */ 23 24#include <linux/init.h> 25#include <linux/linkage.h> 26#include <asm/asm-offsets.h> 27#include <asm/page.h> 28#include <asm/ptrace.h> 29#include <asm/sclp.h> 30#include "boot.h" 31 32#define EP_OFFSET 0x10008 33#define EP_STRING "S390EP" 34#define IPL_BS 0x730 35 36__HEAD 37ipl_start: 38 mvi __LC_AR_MODE_ID,1 # set esame flag 39 slr %r0,%r0 # set cpuid to zero 40 lhi %r1,2 # mode 2 = esame (dump) 41 sigp %r1,%r0,0x12 # switch to esame mode 42 sam64 # switch to 64 bit addressing mode 43 lgh %r1,__LC_SUBCHANNEL_ID # test if subchannel number 44 brctg %r1,.Lnoload # is valid 45 llgf %r1,__LC_SUBCHANNEL_ID # load ipl subchannel number 46 lghi %r2,IPL_BS # load start address 47 bras %r14,.Lloader # load rest of ipl image 48 larl %r12,parmarea # pointer to parameter area 49 stg %r1,IPL_DEVICE-PARMAREA(%r12) # save ipl device number 50# 51# load parameter file from ipl device 52# 53.Lagain1: 54 larl %r2,_end # ramdisk loc. is temp 55 bras %r14,.Lloader # load parameter file 56 ltgr %r2,%r2 # got anything ? 57 jz .Lnopf 58 lg %r3,MAX_COMMAND_LINE_SIZE-PARMAREA(%r12) 59 aghi %r3,-1 60 clgr %r2,%r3 61 jl .Lnotrunc 62 lgr %r2,%r3 63.Lnotrunc: 64 larl %r4,_end 65 larl %r13,.L_hdr 66 clc 0(3,%r4),0(%r13) # if it is HDRx 67 jz .Lagain1 # skip dataset header 68 larl %r13,.L_eof 69 clc 0(3,%r4),0(%r13) # if it is EOFx 70 jz .Lagain1 # skip dateset trailer 71 lgr %r5,%r2 72 la %r6,COMMAND_LINE-PARMAREA(%r12) 73 lgr %r7,%r2 74 aghi %r7,1 75 mvcl %r6,%r4 76.Lnopf: 77# 78# load ramdisk from ipl device 79# 80.Lagain2: 81 larl %r2,_end # addr of ramdisk 82 stg %r2,INITRD_START-PARMAREA(%r12) 83 bras %r14,.Lloader # load ramdisk 84 stg %r2,INITRD_SIZE-PARMAREA(%r12) # store size of rd 85 ltgr %r2,%r2 86 jnz .Lrdcont 87 stg %r2,INITRD_START-PARMAREA(%r12) # no ramdisk found 88.Lrdcont: 89 larl %r2,_end 90 larl %r13,.L_hdr # skip HDRx and EOFx 91 clc 0(3,%r2),0(%r13) 92 jz .Lagain2 93 larl %r13,.L_eof 94 clc 0(3,%r2),0(%r13) 95 jz .Lagain2 96# 97# reset files in VM reader 98# 99 larl %r13,.Lcpuid 100 stidp 0(%r13) # store cpuid 101 tm 0(%r13),0xff # running VM ? 102 jno .Lnoreset 103 larl %r2,.Lreset 104 lghi %r3,26 105 diag %r2,%r3,8 106 larl %r5,.Lirb 107 stsch 0(%r5) # check if irq is pending 108 tm 30(%r5),0x0f # by verifying if any of the 109 jnz .Lwaitforirq # activity or status control 110 tm 31(%r5),0xff # bits is set in the schib 111 jz .Lnoreset 112.Lwaitforirq: 113 bras %r14,.Lirqwait # wait for IO interrupt 114 c %r1,__LC_SUBCHANNEL_ID # compare subchannel number 115 jne .Lwaitforirq 116 larl %r5,.Lirb 117 tsch 0(%r5) 118.Lnoreset: 119 j .Lnoload 120# 121# everything loaded, go for it 122# 123.Lnoload: 124 jg startup 125# 126# subroutine to wait for end I/O 127# 128.Lirqwait: 129 larl %r13,.Lnewpswmask # set up IO interrupt psw 130 mvc __LC_IO_NEW_PSW(8),0(%r13) 131 stg %r14,__LC_IO_NEW_PSW+8 132 larl %r13,.Lwaitpsw 133 lpswe 0(%r13) 134.Lioint: 135# 136# subroutine for loading cards from the reader 137# 138.Lloader: 139 lgr %r4,%r14 140 larl %r3,.Lorb # r2 = address of orb into r2 141 larl %r5,.Lirb # r4 = address of irb 142 larl %r6,.Lccws 143 lghi %r7,20 144.Linit: 145 st %r2,4(%r6) # initialize CCW data addresses 146 la %r2,0x50(%r2) 147 la %r6,8(%r6) 148 brctg %r7,.Linit 149 larl %r13,.Lcr6 150 lctlg %c6,%c6,0(%r13) 151 xgr %r2,%r2 152.Lldlp: 153 ssch 0(%r3) # load chunk of 1600 bytes 154 jnz .Llderr 155.Lwait4irq: 156 bras %r14,.Lirqwait 157 c %r1,__LC_SUBCHANNEL_ID # compare subchannel number 158 jne .Lwait4irq 159 tsch 0(%r5) 160 xgr %r0,%r0 161 ic %r0,8(%r5) # get device status 162 cghi %r0,8 # channel end ? 163 je .Lcont 164 cghi %r0,12 # channel end + device end ? 165 je .Lcont 166 llgf %r0,4(%r5) 167 sgf %r0,8(%r3) # r0/8 = number of ccws executed 168 mghi %r0,10 # *10 = number of bytes in ccws 169 llgh %r3,10(%r5) # get residual count 170 sgr %r0,%r3 # #ccws*80-residual=#bytes read 171 agr %r2,%r0 172 br %r4 # r2 contains the total size 173.Lcont: 174 aghi %r2,0x640 # add 0x640 to total size 175 larl %r6,.Lccws 176 lghi %r7,20 177.Lincr: 178 l %r0,4(%r6) # update CCW data addresses 179 aghi %r0,0x640 180 st %r0,4(%r6) 181 aghi %r6,8 182 brctg %r7,.Lincr 183 j .Lldlp 184.Llderr: 185 larl %r13,.Lcrash 186 lpsw 0(%r13) 187 188 .align 8 189.Lwaitpsw: 190 .quad 0x0202000180000000,.Lioint 191.Lnewpswmask: 192 .quad 0x0000000180000000 193 .align 8 194.Lorb: .long 0x00000000,0x0080ff00,.Lccws 195.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 196 .align 8 197.Lcr6: .quad 0x00000000ff000000 198 .align 8 199.Lcrash:.long 0x000a0000,0x00000000 200 .align 8 201.Lccws: .rept 19 202 .long 0x02600050,0x00000000 203 .endr 204 .long 0x02200050,0x00000000 205.Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40 206 .byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6 207 .byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold" 208.L_eof: .long 0xc5d6c600 /* C'EOF' */ 209.L_hdr: .long 0xc8c4d900 /* C'HDR' */ 210 .align 8 211.Lcpuid:.fill 8,1,0 212 213# 214# normal startup-code, running in absolute addressing mode 215# this is called either by the ipl loader or directly by PSW restart 216# or linload or SALIPL 217# 218 .org STARTUP_NORMAL_OFFSET - IPL_START 219SYM_CODE_START(startup) 220 j startup_normal 221 .org EP_OFFSET - IPL_START 222# 223# This is a list of s390 kernel entry points. At address 0x1000f the number of 224# valid entry points is stored. 225# 226# IMPORTANT: Do not change this table, it is s390 kernel ABI! 227# 228 .ascii EP_STRING 229 .byte 0x00,0x01 230# 231# kdump startup-code, running in 64 bit absolute addressing mode 232# 233 .org STARTUP_KDUMP_OFFSET - IPL_START 234 j startup_kdump 235SYM_CODE_END(startup) 236SYM_CODE_START_LOCAL(startup_normal) 237 mvi __LC_AR_MODE_ID,1 # set esame flag 238 slr %r0,%r0 # set cpuid to zero 239 lhi %r1,2 # mode 2 = esame (dump) 240 sigp %r1,%r0,0x12 # switch to esame mode 241 bras %r13,0f 242 .fill 16,4,0x0 2430: lmh %r0,%r15,0(%r13) # clear high-order half of gprs 244 sam64 # switch to 64 bit addressing mode 245 larl %r13,.Lext_new_psw 246 mvc __LC_EXT_NEW_PSW(16),0(%r13) 247 larl %r13,.Lpgm_new_psw 248 mvc __LC_PGM_NEW_PSW(16),0(%r13) 249 larl %r13,.Lio_new_psw 250 mvc __LC_IO_NEW_PSW(16),0(%r13) 251 xc 0x200(256),0x200 # partially clear lowcore 252 xc 0x300(256),0x300 253 xc 0xe00(256),0xe00 254 xc 0xf00(256),0xf00 255 larl %r13,.Lctl 256 lctlg %c0,%c15,0(%r13) # load control registers 257 stcke __LC_BOOT_CLOCK 258 mvc __LC_LAST_UPDATE_CLOCK(8),__LC_BOOT_CLOCK+1 259 larl %r13,6f 260 spt 0(%r13) 261 mvc __LC_LAST_UPDATE_TIMER(8),0(%r13) 262 larl %r15,_stack_end-STACK_FRAME_OVERHEAD 263 brasl %r14,sclp_early_setup_buffer 264 brasl %r14,verify_facilities 265 brasl %r14,startup_kernel 266SYM_CODE_END(startup_normal) 267 268 .align 8 2696: .long 0x7fffffff,0xffffffff 270.Lext_new_psw: 271 .quad 0x0002000180000000,0x1b0 # disabled wait 272.Lpgm_new_psw: 273 .quad 0x0000000180000000,startup_pgm_check_handler 274.Lio_new_psw: 275 .quad 0x0002000180000000,0x1f0 # disabled wait 276.Lctl: .quad 0x04040000 # cr0: AFP registers & secondary space 277 .quad 0 # cr1: primary space segment table 278 .quad 0 # cr2: dispatchable unit control table 279 .quad 0 # cr3: instruction authorization 280 .quad 0xffff # cr4: instruction authorization 281 .quad 0 # cr5: primary-aste origin 282 .quad 0 # cr6: I/O interrupts 283 .quad 0 # cr7: secondary space segment table 284 .quad 0x0000000000008000 # cr8: access registers translation 285 .quad 0 # cr9: tracing off 286 .quad 0 # cr10: tracing off 287 .quad 0 # cr11: tracing off 288 .quad 0 # cr12: tracing off 289 .quad 0 # cr13: home space segment table 290 .quad 0xc0000000 # cr14: machine check handling off 291 .quad 0 # cr15: linkage stack operations 292 293#include "head_kdump.S" 294 295# 296# This program check is active immediately after kernel start 297# and until early_pgm_check_handler is set in kernel/early.c 298# It simply saves general/control registers and psw in 299# the save area and does disabled wait with a faulty address. 300# 301SYM_CODE_START_LOCAL(startup_pgm_check_handler) 302 stmg %r8,%r15,__LC_SAVE_AREA_SYNC 303 la %r8,4095 304 stctg %c0,%c15,__LC_CREGS_SAVE_AREA-4095(%r8) 305 stmg %r0,%r7,__LC_GPREGS_SAVE_AREA-4095(%r8) 306 mvc __LC_GPREGS_SAVE_AREA-4095+64(64,%r8),__LC_SAVE_AREA_SYNC 307 mvc __LC_PSW_SAVE_AREA-4095(16,%r8),__LC_PGM_OLD_PSW 308 mvc __LC_RETURN_PSW(16),__LC_PGM_OLD_PSW 309 ni __LC_RETURN_PSW,0xfc # remove IO and EX bits 310 ni __LC_RETURN_PSW+1,0xfb # remove MCHK bit 311 oi __LC_RETURN_PSW+1,0x2 # set wait state bit 312 larl %r9,.Lold_psw_disabled_wait 313 stg %r9,__LC_PGM_NEW_PSW+8 314 larl %r15,_dump_info_stack_end-STACK_FRAME_OVERHEAD 315 brasl %r14,print_pgm_check_info 316.Lold_psw_disabled_wait: 317 la %r8,4095 318 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r8) 319 lpswe __LC_RETURN_PSW # disabled wait 320SYM_CODE_END(startup_pgm_check_handler)