mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-24 20:19:44 +00:00
22d67ab55a
stsch is the canonical way to detect devices. As a bonus, we can abort the loop if we get cc 3, and we need to check only the valid devices (dnv set). Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de>
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
/*
|
|
* S390 virtio-ccw loading program
|
|
*
|
|
* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
|
|
*
|
|
* 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
|
|
* directory.
|
|
*/
|
|
|
|
#include "s390-ccw.h"
|
|
|
|
struct subchannel_id blk_schid;
|
|
char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
|
|
|
|
void virtio_panic(const char *string)
|
|
{
|
|
sclp_print(string);
|
|
disabled_wait();
|
|
while (1) { }
|
|
}
|
|
|
|
static void virtio_setup(void)
|
|
{
|
|
struct schib schib;
|
|
int i;
|
|
int r;
|
|
bool found = false;
|
|
|
|
blk_schid.one = 1;
|
|
|
|
for (i = 0; i < 0x10000; i++) {
|
|
blk_schid.sch_no = i;
|
|
r = stsch_err(blk_schid, &schib);
|
|
if (r == 3) {
|
|
break;
|
|
}
|
|
if (schib.pmcw.dnv) {
|
|
if (virtio_is_blk(blk_schid)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
virtio_panic("No virtio-blk device found!\n");
|
|
}
|
|
|
|
virtio_setup_block(blk_schid);
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
sclp_setup();
|
|
virtio_setup();
|
|
if (zipl_load() < 0)
|
|
sclp_print("Failed to load OS from hard disk\n");
|
|
disabled_wait();
|
|
while (1) { }
|
|
}
|