Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
[qemu.git] / pc-bios / s390-ccw / main.c
1 /*
2 * S390 virtio-ccw loading program
3 *
4 * Copyright (c) 2013 Alexander Graf <agraf@suse.de>
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or (at
7 * your option) any later version. See the COPYING file in the top-level
8 * directory.
9 */
10
11 #include "s390-ccw.h"
12
13 char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
14 uint64_t boot_value;
15
16 void virtio_panic(const char *string)
17 {
18 sclp_print(string);
19 disabled_wait();
20 while (1) { }
21 }
22
23 static void virtio_setup(uint64_t dev_info)
24 {
25 struct subchannel_id blk_schid = { .one = 1 };
26 struct schib schib;
27 int i;
28 int r;
29 bool found = false;
30 bool check_devno = false;
31 uint16_t dev_no = -1;
32
33 if (dev_info != -1) {
34 check_devno = true;
35 dev_no = dev_info & 0xffff;
36 debug_print_int("device no. ", dev_no);
37 blk_schid.ssid = (dev_info >> 16) & 0x3;
38 if (blk_schid.ssid != 0) {
39 debug_print_int("ssid ", blk_schid.ssid);
40 if (enable_mss_facility() != 0) {
41 virtio_panic("Failed to enable mss facility\n");
42 }
43 }
44 }
45
46 for (i = 0; i < 0x10000; i++) {
47 blk_schid.sch_no = i;
48 r = stsch_err(blk_schid, &schib);
49 if (r == 3) {
50 break;
51 }
52 if (schib.pmcw.dnv) {
53 if (!check_devno || (schib.pmcw.dev == dev_no)) {
54 if (virtio_is_blk(blk_schid)) {
55 found = true;
56 break;
57 }
58 }
59 }
60 }
61
62 if (!found) {
63 virtio_panic("No virtio-blk device found!\n");
64 }
65
66 virtio_setup_block(blk_schid);
67 }
68
69 int main(void)
70 {
71 sclp_setup();
72 debug_print_int("boot reg[7] ", boot_value);
73 virtio_setup(boot_value);
74
75 if (zipl_load() < 0)
76 sclp_print("Failed to load OS from hard disk\n");
77 disabled_wait();
78 while (1) { }
79 }