xref: /openbmc/qemu/pc-bios/s390-ccw/start.S (revision 8c1f72da)
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
16larl	%r15, stack + 0x8000    /* Set up stack */
17larl    %r6, boot_value
18stg     %r7, 0(%r6)     /* save the boot_value before any function calls */
19j	main                    /* And call C */
20
21/*
22 * void disabled_wait(void)
23 *
24 * stops the current guest cpu.
25 */
26	.globl disabled_wait
27disabled_wait:
28        larl %r1,disabled_wait_psw
29        lpswe   0(%r1)
30
31        .align  8
32disabled_wait_psw:
33        .quad   0x0002000180000000,0x0000000000000000
34