xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | |
| 150 | iplstart: |
| 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 |
| 157 | 0: 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 |
| 273 | ENTRY(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 |
| 288 | ENTRY(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 |
| 297 | 0: 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 |
| 322 | 6: .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 |