arch/s390/boot/compressed/head31.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         l       %r15,.Lstack-.LPG1(%r13)
  22         ahi     %r15,-96
  23         l       %r1,.Ldecompress-.LPG1(%r13)
  24         basr    %r14,%r1
  25         # setup registers for memory mover & branch to target
  26         lr      %r4,%r2
  27         l       %r2,.Loffset-.LPG1(%r13)
  28         la      %r4,0(%r2,%r4)
  29         l       %r3,.Lmvsize-.LPG1(%r13)
  30         lr      %r5,%r3
  31         # move the memory mover someplace safe
  32         la      %r1,0x200
  33         mvc     0(mover_end-mover,%r1),mover-.LPG1(%r13)
  34         # decompress image is started at 0x11000
  35         lr      %r6,%r2
  36         br      %r1
  37 mover:
  38         mvcle   %r2,%r4,0
  39         jo      mover
  40         br      %r6
  41 mover_end:
  42
  43         .align  8
  44 .Lstack:
  45         .long   0x8000 + (1<<(PAGE_SHIFT+THREAD_ORDER))
  46 .Ldecompress:
  47         .long   decompress_kernel
  48 .Loffset:
  49         .long   0x11000
  50 .Lmvsize:
  51         .long   SZ__bss_start