LXR linux/arch/s390/kernel/head.S

   1/*
   2 * Copyright IBM Corp. 1999,2009
   3 *
   4 *    Author(s): Hartmut Penner <hp@de.ibm.com>
   5 *               Martin Schwidefsky <schwidefsky@de.ibm.com>
   6 *               Rob van der Heij <rvdhei@iae.nl>
   7 *               Heiko Carstens <heiko.carstens@de.ibm.com>
   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 <asm/setup.h>
  26#include <asm/lowcore.h>
  27#include <asm/asm-offsets.h>
  28#include <asm/thread_info.h>
  29#include <asm/page.h>
  30#include <asm/cpu.h>
  31
  32#ifdef CONFIG_64BIT
  33#define ARCH_OFFSET     4
  34#else
  35#define ARCH_OFFSET     0
  36#endif
  37
  38__HEAD
  39#ifndef CONFIG_IPL
  40        .org   0
  41        .long  0x00080000,0x80000000+startup    # Just a restart PSW
  42#else
  43#ifdef CONFIG_IPL_TAPE
  44#define IPL_BS 1024
  45        .org   0
  46        .long  0x00080000,0x80000000+iplstart   # The first 24 bytes are loaded
  47        .long  0x27000000,0x60000001            # by ipl to addresses 0-23.
  48        .long  0x02000000,0x20000000+IPL_BS     # (a PSW and two CCWs).
  49        .long  0x00000000,0x00000000            # external old psw
  50        .long  0x00000000,0x00000000            # svc old psw
  51        .long  0x00000000,0x00000000            # program check old psw
  52        .long  0x00000000,0x00000000            # machine check old psw
  53        .long  0x00000000,0x00000000            # io old psw
  54        .long  0x00000000,0x00000000
  55        .long  0x00000000,0x00000000
  56        .long  0x00000000,0x00000000
  57        .long  0x000a0000,0x00000058            # external new psw
  58        .long  0x000a0000,0x00000060            # svc new psw
  59        .long  0x000a0000,0x00000068            # program check new psw
  60        .long  0x000a0000,0x00000070            # machine check new psw
  61        .long  0x00080000,0x80000000+.Lioint    # io new psw
  62
  63        .org   0x100
  64#
  65# subroutine for loading from tape
  66# Parameters:
  67#  R1 = device number
  68#  R2 = load address
  69.Lloader:
  70        st      %r14,.Lldret
  71        la      %r3,.Lorbread           # r3 = address of orb
  72        la      %r5,.Lirb               # r5 = address of irb
  73        st      %r2,.Lccwread+4         # initialize CCW data addresses
  74        lctl    %c6,%c6,.Lcr6
  75        slr     %r2,%r2
  76.Lldlp:
  77        la      %r6,3                   # 3 retries
  78.Lssch:
  79        ssch    0(%r3)                  # load chunk of IPL_BS bytes
  80        bnz     .Llderr
  81.Lw4end:
  82        bas     %r14,.Lwait4io
  83        tm      8(%r5),0x82             # do we have a problem ?
  84        bnz     .Lrecov
  85        slr     %r7,%r7
  86        icm     %r7,3,10(%r5)           # get residual count
  87        lcr     %r7,%r7
  88        la      %r7,IPL_BS(%r7)         # IPL_BS-residual=#bytes read
  89        ar      %r2,%r7                 # add to total size
  90        tm      8(%r5),0x01             # found a tape mark ?
  91        bnz     .Ldone
  92        l       %r0,.Lccwread+4         # update CCW data addresses
  93        ar      %r0,%r7
  94        st      %r0,.Lccwread+4
  95        b       .Lldlp
  96.Ldone:
  97        l       %r14,.Lldret
  98        br      %r14                    # r2 contains the total size
  99.Lrecov:
 100        bas     %r14,.Lsense            # do the sensing
 101        bct     %r6,.Lssch              # dec. retry count & branch
 102        b       .Llderr
 103#
 104# Sense subroutine
 105#
 106.Lsense:
 107        st      %r14,.Lsnsret
 108        la      %r7,.Lorbsense
 109        ssch    0(%r7)                  # start sense command
 110        bnz     .Llderr
 111        bas     %r14,.Lwait4io
 112        l       %r14,.Lsnsret
 113        tm      8(%r5),0x82             # do we have a problem ?
 114        bnz     .Llderr
 115        br      %r14
 116#
 117# Wait for interrupt subroutine
 118#
 119.Lwait4io:
 120        lpsw    .Lwaitpsw
 121.Lioint:
 122        c       %r1,0xb8                # compare subchannel number
 123        bne     .Lwait4io
 124        tsch    0(%r5)
 125        slr     %r0,%r0
 126        tm      8(%r5),0x82             # do we have a problem ?
 127        bnz     .Lwtexit
 128        tm      8(%r5),0x04             # got device end ?
 129        bz      .Lwait4io
 130.Lwtexit:
 131        br      %r14
 132.Llderr:
 133        lpsw    .Lcrash
 134
 135        .align  8
 136.Lorbread:
 137        .long   0x00000000,0x0080ff00,.Lccwread
 138        .align  8
 139.Lorbsense:
 140        .long   0x00000000,0x0080ff00,.Lccwsense
 141        .align  8
 142.Lccwread:
 143        .long   0x02200000+IPL_BS,0x00000000
 144.Lccwsense:
 145        .long   0x04200001,0x00000000
 146.Lwaitpsw:
 147        .long   0x020a0000,0x80000000+.Lioint
 148
 149.Lirb:  .long   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
 150.Lcr6:  .long   0xff000000
 151        .align  8
 152.Lcrash:.long   0x000a0000,0x00000000
 153.Lldret:.long   0
 154.Lsnsret: .long 0
 155#endif  /* CONFIG_IPL_TAPE */
 156
 157#ifdef CONFIG_IPL_VM
 158#define IPL_BS  0x730
 159        .org    0
 160        .long   0x00080000,0x80000000+iplstart  # The first 24 bytes are loaded
 161        .long   0x02000018,0x60000050           # by ipl to addresses 0-23.
 162        .long   0x02000068,0x60000050           # (a PSW and two CCWs).
 163        .fill   80-24,1,0x40                    # bytes 24-79 are discarded !!
 164        .long   0x020000f0,0x60000050           # The next 160 byte are loaded
 165        .long   0x02000140,0x60000050           # to addresses 0x18-0xb7
 166        .long   0x02000190,0x60000050           # They form the continuation
 167        .long   0x020001e0,0x60000050           # of the CCW program started
 168        .long   0x02000230,0x60000050           # by ipl and load the range
 169        .long   0x02000280,0x60000050           # 0x0f0-0x730 from the image
 170        .long   0x020002d0,0x60000050           # to the range 0x0f0-0x730
 171        .long   0x02000320,0x60000050           # in memory. At the end of
 172        .long   0x02000370,0x60000050           # the channel program the PSW
 173        .long   0x020003c0,0x60000050           # at location 0 is loaded.
 174        .long   0x02000410,0x60000050           # Initial processing starts
 175        .long   0x02000460,0x60000050           # at 0xf0 = iplstart.
 176        .long   0x020004b0,0x60000050
 177        .long   0x02000500,0x60000050
 178        .long   0x02000550,0x60000050
 179        .long   0x020005a0,0x60000050
 180        .long   0x020005f0,0x60000050
 181        .long   0x02000640,0x60000050
 182        .long   0x02000690,0x60000050
 183        .long   0x020006e0,0x20000050
 184
 185        .org    0xf0
 186#
 187# subroutine for loading cards from the reader
 188#
 189.Lloader:
 190        la      %r3,.Lorb               # r2 = address of orb into r2
 191        la      %r5,.Lirb               # r4 = address of irb
 192        la      %r6,.Lccws
 193        la      %r7,20
 194.Linit:
 195        st      %r2,4(%r6)              # initialize CCW data addresses
 196        la      %r2,0x50(%r2)
 197        la      %r6,8(%r6)
 198        bct     7,.Linit
 199
 200        lctl    %c6,%c6,.Lcr6           # set IO subclass mask
 201        slr     %r2,%r2
 202.Lldlp:
 203        ssch    0(%r3)                  # load chunk of 1600 bytes
 204        bnz     .Llderr
 205.Lwait4irq:
 206        mvc     0x78(8),.Lnewpsw        # set up IO interrupt psw
 207        lpsw    .Lwaitpsw
 208.Lioint:
 209        c       %r1,0xb8                # compare subchannel number
 210        bne     .Lwait4irq
 211        tsch    0(%r5)
 212
 213        slr     %r0,%r0
 214        ic      %r0,8(%r5)              # get device status
 215        chi     %r0,8                   # channel end ?
 216        be      .Lcont
 217        chi     %r0,12                  # channel end + device end ?
 218        be      .Lcont
 219
 220        l       %r0,4(%r5)
 221        s       %r0,8(%r3)              # r0/8 = number of ccws executed
 222        mhi     %r0,10                  # *10 = number of bytes in ccws
 223        lh      %r3,10(%r5)             # get residual count
 224        sr      %r0,%r3                 # #ccws*80-residual=#bytes read
 225        ar      %r2,%r0
 226
 227        br      %r14                    # r2 contains the total size
 228
 229.Lcont:
 230        ahi     %r2,0x640               # add 0x640 to total size
 231        la      %r6,.Lccws
 232        la      %r7,20
 233.Lincr:
 234        l       %r0,4(%r6)              # update CCW data addresses
 235        ahi     %r0,0x640
 236        st      %r0,4(%r6)
 237        ahi     %r6,8
 238        bct     7,.Lincr
 239
 240        b       .Lldlp
 241.Llderr:
 242        lpsw    .Lcrash
 243
 244        .align  8
 245.Lorb:  .long   0x00000000,0x0080ff00,.Lccws
 246.Lirb:  .long   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
 247.Lcr6:  .long   0xff000000
 248.Lloadp:.long   0,0
 249        .align  8
 250.Lcrash:.long   0x000a0000,0x00000000
 251.Lnewpsw:
 252        .long   0x00080000,0x80000000+.Lioint
 253.Lwaitpsw:
 254        .long   0x020a0000,0x80000000+.Lioint
 255
 256        .align  8
 257.Lccws: .rept   19
 258        .long   0x02600050,0x00000000
 259        .endr
 260        .long   0x02200050,0x00000000
 261#endif  /* CONFIG_IPL_VM */
 262
 263iplstart:
 264        lh      %r1,0xb8                # test if subchannel number
 265        bct     %r1,.Lnoload            #  is valid
 266        l       %r1,0xb8                # load ipl subchannel number
 267        la      %r2,IPL_BS              # load start address
 268        bas     %r14,.Lloader           # load rest of ipl image
 269        l       %r12,.Lparm             # pointer to parameter area
 270        st      %r1,IPL_DEVICE+ARCH_OFFSET-PARMAREA(%r12) # save ipl device number
 271
 272#
 273# load parameter file from ipl device
 274#
 275.Lagain1:
 276        l       %r2,.Linitrd            # ramdisk loc. is temp
 277        bas     %r14,.Lloader           # load parameter file
 278        ltr     %r2,%r2                 # got anything ?
 279        bz      .Lnopf
 280        chi     %r2,895
 281        bnh     .Lnotrunc
 282        la      %r2,895
 283.Lnotrunc:
 284        l       %r4,.Linitrd
 285        clc     0(3,%r4),.L_hdr         # if it is HDRx
 286        bz      .Lagain1                # skip dataset header
 287        clc     0(3,%r4),.L_eof         # if it is EOFx
 288        bz      .Lagain1                # skip dateset trailer
 289        la      %r5,0(%r4,%r2)
 290        lr      %r3,%r2
 291.Lidebc:
 292        tm      0(%r5),0x80             # high order bit set ?
 293        bo      .Ldocv                  #  yes -> convert from EBCDIC
 294        ahi     %r5,-1
 295        bct     %r3,.Lidebc
 296        b       .Lnocv
 297.Ldocv:
 298        l       %r3,.Lcvtab
 299        tr      0(256,%r4),0(%r3)       # convert parameters to ascii
 300        tr      256(256,%r4),0(%r3)
 301        tr      512(256,%r4),0(%r3)
 302        tr      768(122,%r4),0(%r3)
 303.Lnocv: la      %r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
 304        mvc     0(256,%r3),0(%r4)
 305        mvc     256(256,%r3),256(%r4)
 306        mvc     512(256,%r3),512(%r4)
 307        mvc     768(122,%r3),768(%r4)
 308        slr     %r0,%r0
 309        b       .Lcntlp
 310.Ldelspc:
 311        ic      %r0,0(%r2,%r3)
 312        chi     %r0,0x20                # is it a space ?
 313        be      .Lcntlp
 314        ahi     %r2,1
 315        b       .Leolp
 316.Lcntlp:
 317        brct    %r2,.Ldelspc
 318.Leolp:
 319        slr     %r0,%r0
 320        stc     %r0,0(%r2,%r3)          # terminate buffer
 321.Lnopf:
 322
 323#
 324# load ramdisk from ipl device
 325#
 326.Lagain2:
 327        l       %r2,.Linitrd            # addr of ramdisk
 328        st      %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12)
 329        bas     %r14,.Lloader           # load ramdisk
 330        st      %r2,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r12) # store size of rd
 331        ltr     %r2,%r2
 332        bnz     .Lrdcont
 333        st      %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # no ramdisk found
 334.Lrdcont:
 335        l       %r2,.Linitrd
 336
 337        clc     0(3,%r2),.L_hdr         # skip HDRx and EOFx
 338        bz      .Lagain2
 339        clc     0(3,%r2),.L_eof
 340        bz      .Lagain2
 341
 342#ifdef CONFIG_IPL_VM
 343#
 344# reset files in VM reader
 345#
 346        stidp   __LC_CPUID              # store cpuid
 347        tm      __LC_CPUID,0xff         # running VM ?
 348        bno     .Lnoreset
 349        la      %r2,.Lreset
 350        lhi     %r3,26
 351        diag    %r2,%r3,8
 352        la      %r5,.Lirb
 353        stsch   0(%r5)                  # check if irq is pending
 354        tm      30(%r5),0x0f            # by verifying if any of the
 355        bnz     .Lwaitforirq            # activity or status control
 356        tm      31(%r5),0xff            # bits is set in the schib
 357        bz      .Lnoreset
 358.Lwaitforirq:
 359        mvc     0x78(8),.Lrdrnewpsw     # set up IO interrupt psw
 360.Lwaitrdrirq:
 361        lpsw    .Lrdrwaitpsw
 362.Lrdrint:
 363        c       %r1,0xb8                # compare subchannel number
 364        bne     .Lwaitrdrirq
 365        la      %r5,.Lirb
 366        tsch    0(%r5)
 367.Lnoreset:
 368        b       .Lnoload
 369
 370        .align  8
 371.Lrdrnewpsw:
 372        .long   0x00080000,0x80000000+.Lrdrint
 373.Lrdrwaitpsw:
 374        .long   0x020a0000,0x80000000+.Lrdrint
 375#endif
 376
 377#
 378# everything loaded, go for it
 379#
 380.Lnoload:
 381        l       %r1,.Lstartup
 382        br      %r1
 383
 384.Linitrd:.long _end + 0x400000          # default address of initrd
 385.Lparm: .long  PARMAREA
 386.Lstartup: .long startup
 387.Lcvtab:.long   _ebcasc                 # ebcdic to ascii table
 388.Lreset:.byte   0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40
 389        .byte   0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6
 390        .byte   0xc8,0xd6,0xd3,0xc4     # "change rdr all keep nohold"
 391.L_eof: .long   0xc5d6c600       /* C'EOF' */
 392.L_hdr: .long   0xc8c4d900       /* C'HDR' */
 393
 394#endif  /* CONFIG_IPL */
 395
 396#
 397# SALIPL loader support. Based on a patch by Rob van der Heij.
 398# This entry point is called directly from the SALIPL loader and
 399# doesn't need a builtin ipl record.
 400#
 401        .org    0x800
 402        .globl  start
 403start:
 404        stm     %r0,%r15,0x07b0         # store registers
 405        basr    %r12,%r0
 406.base:
 407        l       %r11,.parm
 408        l       %r8,.cmd                # pointer to command buffer
 409
 410        ltr     %r9,%r9                 # do we have SALIPL parameters?
 411        bp      .sk8x8
 412
 413        mvc     0(64,%r8),0x00b0        # copy saved registers
 414        xc      64(240-64,%r8),0(%r8)   # remainder of buffer
 415        tr      0(64,%r8),.lowcase
 416        b       .gotr
 417.sk8x8:
 418        mvc     0(240,%r8),0(%r9)       # copy iplparms into buffer
 419.gotr:
 420        l       %r10,.tbl               # EBCDIC to ASCII table
 421        tr      0(240,%r8),0(%r10)
 422        slr     %r0,%r0
 423        st      %r0,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r11)
 424        st      %r0,INITRD_START+ARCH_OFFSET-PARMAREA(%r11)
 425        j       startup                 # continue with startup
 426.tbl:   .long   _ebcasc                 # translate table
 427.cmd:   .long   COMMAND_LINE            # address of command line buffer
 428.parm:  .long   PARMAREA
 429.lowcase:
 430        .byte 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07
 431        .byte 0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f
 432        .byte 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17
 433        .byte 0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f
 434        .byte 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27
 435        .byte 0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f
 436        .byte 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37
 437        .byte 0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f
 438        .byte 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47
 439        .byte 0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f
 440        .byte 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57
 441        .byte 0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f
 442        .byte 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67
 443        .byte 0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f
 444        .byte 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77
 445        .byte 0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f
 446
 447        .byte 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87
 448        .byte 0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f
 449        .byte 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97
 450        .byte 0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f
 451        .byte 0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7
 452        .byte 0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf
 453        .byte 0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7
 454        .byte 0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf
 455        .byte 0xc0,0x81,0x82,0x83,0x84,0x85,0x86,0x87   # .abcdefg
 456        .byte 0x88,0x89,0xca,0xcb,0xcc,0xcd,0xce,0xcf   # hi
 457        .byte 0xd0,0x91,0x92,0x93,0x94,0x95,0x96,0x97   # .jklmnop
 458        .byte 0x98,0x99,0xda,0xdb,0xdc,0xdd,0xde,0xdf   # qr
 459        .byte 0xe0,0xe1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7   # ..stuvwx
 460        .byte 0xa8,0xa9,0xea,0xeb,0xec,0xed,0xee,0xef   # yz
 461        .byte 0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7
 462        .byte 0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff
 463
 464#
 465# startup-code at 0x10000, running in absolute addressing mode
 466# this is called either by the ipl loader or directly by PSW restart
 467# or linload or SALIPL
 468#
 469        .org    0x10000
 470startup:basr    %r13,0                  # get base
 471.LPG0:
 472        xc      0x200(256),0x200        # partially clear lowcore
 473        xc      0x300(256),0x300
 474        l       %r1,5f-.LPG0(%r13)
 475        stck    0(%r1)
 476        spt     6f-.LPG0(%r13)
 477        mvc     __LC_LAST_UPDATE_CLOCK(8),0(%r1)
 478        mvc     __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
 479        mvc     __LC_EXIT_TIMER(8),5f-.LPG0(%r13)
 480#ifndef CONFIG_MARCH_G5
 481        # check capabilities against MARCH_{G5,Z900,Z990,Z9_109,Z10}
 482        xc      __LC_STFL_FAC_LIST(8),__LC_STFL_FAC_LIST
 483        stfl    __LC_STFL_FAC_LIST      # store facility list
 484        tm      __LC_STFL_FAC_LIST,0x01 # stfle available ?
 485        jz      0f
 486        la      %r0,0
 487        .insn   s,0xb2b00000,__LC_STFL_FAC_LIST # store facility list extended
 4880:      l       %r0,__LC_STFL_FAC_LIST
 489        n       %r0,2f+8-.LPG0(%r13)
 490        cl      %r0,2f+8-.LPG0(%r13)
 491        jne     1f
 492        l       %r0,__LC_STFL_FAC_LIST+4
 493        n       %r0,2f+12-.LPG0(%r13)
 494        cl      %r0,2f+12-.LPG0(%r13)
 495        je      3f
 4961:      l       %r15,.Lstack-.LPG0(%r13)
 497        ahi     %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE
 498        ahi     %r15,-96
 499        la      %r2,.Lals_string-.LPG0(%r13)
 500        l       %r3,.Lsclp_print-.LPG0(%r13)
 501        basr    %r14,%r3
 502        lpsw    2f-.LPG0(%r13)          # machine type not good enough, crash
 503.Lals_string:
 504        .asciz  "The Linux kernel requires more recent processor hardware"
 505.Lsclp_print:
 506        .long   _sclp_print_early
 507.Lstack:
 508        .long   init_thread_union
 509        .align 16
 5102:      .long   0x000a0000,0x8badcccc
 511#if defined(CONFIG_64BIT)
 512#if defined(CONFIG_MARCH_Z10)
 513        .long 0xc100efe3, 0xf0680000
 514#elif defined(CONFIG_MARCH_Z9_109)
 515        .long 0xc100efc3, 0x00000000
 516#elif defined(CONFIG_MARCH_Z990)
 517        .long 0xc0002000, 0x00000000
 518#elif defined(CONFIG_MARCH_Z900)
 519        .long 0xc0000000, 0x00000000
 520#endif
 521#else
 522#if defined(CONFIG_MARCH_Z10)
 523        .long 0x8100c880, 0x00000000
 524#elif defined(CONFIG_MARCH_Z9_109)
 525        .long 0x8100c880, 0x00000000
 526#elif defined(CONFIG_MARCH_Z990)
 527        .long 0x80002000, 0x00000000
 528#elif defined(CONFIG_MARCH_Z900)
 529        .long 0x80000000, 0x00000000
 530#endif
 531#endif
 5323:
 533#endif
 534
 535        l       %r13,4f-.LPG0(%r13)
 536        b       0(%r13)
 537        .align  4
 5384:      .long   startup_continue
 5395:      .long   sched_clock_base_cc
 540        .align  8
 5416:      .long   0x7fffffff,0xffffffff
 542
 543#
 544# params at 10400 (setup.h)
 545#
 546        .org    PARMAREA
 547        .long   0,0                     # IPL_DEVICE
 548        .long   0,0                     # INITRD_START
 549        .long   0,0                     # INITRD_SIZE
 550
 551        .org    COMMAND_LINE
 552        .byte   "root=/dev/ram0 ro"
 553        .byte   0
 554
 555#ifdef CONFIG_64BIT
 556#include "head64.S"
 557#else
 558#include "head31.S"
 559#endif
 560