pc-bios/s390-ccw/start.S

   1 /*
   2  * First stage boot loader for virtio devices. The compiled output goes
   3  * into the pc-bios directory of qemu.
   4  *
   5  * Copyright (c) 2013 Alexander Graf <agraf@suse.de>
   6  * Copyright 2013 IBM Corp.
   7  *
   8  * This work is licensed under the terms of the GNU GPL, version 2 or (at
   9  * your option) any later version. See the COPYING file in the top-level
  10  * directory.
  11  */
  12
  13         .globl _start
  14 _start:
  15
  16 larl    %r15, stack + 0x8000    /* Set up stack */
  17 larl    %r6, boot_value
  18 stg     %r7, 0(%r6)     /* save the boot_value before any function calls */
  19 j       main                    /* And call C */
  20
  21 /*
  22  * void disabled_wait(void)
  23  *
  24  * stops the current guest cpu.
  25  */
  26         .globl disabled_wait
  27 disabled_wait:
  28         larl %r1,disabled_wait_psw
  29         lpswe   0(%r1)
  30
  31         .align  8
  32 disabled_wait_psw:
  33         .quad   0x0002000180000000,0x0000000000000000