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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2013-04-23 01:23:02 +0000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2013-04-26 20:18:24 +0200 |
| commit | 7f61cbc108dd16df9a53649d53f26143ad506fe1 (patch) | |
| tree | aad118b1591884e0d6cdef919a4de8712fc4f197 /pc-bios | |
| parent | b462fcd57c0949e4dfd457fafa91db17e0e99113 (diff) | |
| download | qemu-7f61cbc108dd16df9a53649d53f26143ad506fe1.tar.gz | |
s390-ccw.img: replace while loop with a disabled wait on s390 bios
dont waste cpu power on an error condition. Lets stop the guest
with a disabled wait.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'pc-bios')
| -rw-r--r-- | pc-bios/s390-ccw/main.c | 2 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/s390-ccw.h | 3 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/start.S | 15 |
3 files changed, 20 insertions, 0 deletions
diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c index 0913aac5c1..67f4987a85 100644 --- a/pc-bios/s390-ccw/main.c +++ b/pc-bios/s390-ccw/main.c @@ -16,6 +16,7 @@ char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); void virtio_panic(const char *string) { sclp_print(string); + disabled_wait(); while (1) { } } @@ -52,5 +53,6 @@ int main(void) virtio_setup(); if (zipl_load() < 0) sclp_print("Failed to load OS from hard disk\n"); + disabled_wait(); while (1) { } } diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h index a03dbaf015..8241b0af05 100644 --- a/pc-bios/s390-ccw/s390-ccw.h +++ b/pc-bios/s390-ccw/s390-ccw.h @@ -45,6 +45,9 @@ typedef unsigned long long __u64; #include "cio.h" +/* start.s */ +void disabled_wait(void); + /* main.c */ void virtio_panic(const char *string); diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S index c2b9a19d34..09deee7fc0 100644 --- a/pc-bios/s390-ccw/start.S +++ b/pc-bios/s390-ccw/start.S @@ -3,6 +3,7 @@ * into the pc-bios directory of qemu. * * Copyright (c) 2013 Alexander Graf <agraf@suse.de> + * Copyright 2013 IBM Corp. * * This work is licensed under the terms of the GNU GPL, version 2 or (at * your option) any later version. See the COPYING file in the top-level @@ -14,3 +15,17 @@ _start: larl %r15, stack + 0x8000 /* Set up stack */ j main /* And call C */ + +/* + * void disabled_wait(void) + * + * stops the current guest cpu. + */ + .globl disabled_wait +disabled_wait: + larl %r1,disabled_wait_psw + lpswe 0(%r1) + + .align 8 +disabled_wait_psw: + .quad 0x0002000180000000,0x0000000000000000 |