arch/s390/boot/compressed/head.S

   1 /*
   2  * Startup glue code to uncompress the kernel
   3  *
   4  * Copyright IBM Corp. 2010
   5  *
   6  *   Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/linkage.h>
  11 #include <asm/asm-offsets.h>
  12 #include <asm/thread_info.h>
  13 #include <asm/page.h>
  14 #include "sizes.h"
  15
  16 __HEAD
  17 ENTRY(startup_continue)
  18         basr    %r13,0                  # get base
  19 .LPG1:
  20         # setup stack
  21         lg      %r15,.Lstack-.LPG1(%r13)
  22         aghi    %r15,-160
  23         brasl   %r14,decompress_kernel
  24         # setup registers for memory mover & branch to target
  25         lgr     %r4,%r2
  26         lg      %r2,.Loffset-.LPG1(%r13)
  27         la      %r4,0(%r2,%r4)
  28         lg      %r3,.Lmvsize-.LPG1(%r13)
  29         lgr     %r5,%r3
  30         # move the memory mover someplace safe
  31         la      %r1,0x200
  32         mvc     0(mover_end-mover,%r1),mover-.LPG1(%r13)
  33         # decompress image is started at 0x11000
  34         lgr     %r6,%r2
  35         br      %r1
  36 mover:
  37         mvcle   %r2,%r4,0
  38         jo      mover
  39         br      %r6
  40 mover_end:
  41
  42         .align  8
  43 .Lstack:
  44         .quad   0x8000 + (1<<(PAGE_SHIFT+THREAD_ORDER))
  45 .Loffset:
  46         .quad   0x11000
  47 .Lmvsize:
  48         .quad   SZ__bss_start