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 struct subchannel_id blk_schid;
  14 char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
  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(void)
  24 {
  25     struct schib schib;
  26     int i;
  27     int r;
  28     bool found = false;
  29
  30     blk_schid.one = 1;
  31
  32     for (i = 0; i < 0x10000; i++) {
  33         blk_schid.sch_no = i;
  34         r = stsch_err(blk_schid, &schib);
  35         if (r == 3) {
  36             break;
  37         }
  38         if (schib.pmcw.dnv) {
  39             if (virtio_is_blk(blk_schid)) {
  40                 found = true;
  41                 break;
  42             }
  43         }
  44     }
  45
  46     if (!found) {
  47         virtio_panic("No virtio-blk device found!\n");
  48     }
  49
  50     virtio_setup_block(blk_schid);
  51 }
  52
  53 int main(void)
  54 {
  55     sclp_setup();
  56     virtio_setup();
  57     if (zipl_load() < 0)
  58         sclp_print("Failed to load OS from hard disk\n");
  59     disabled_wait();
  60     while (1) { }
  61 }