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 uint64_t boot_value; 16 17 void virtio_panic(const char *string) 18 { 19 sclp_print(string); 20 disabled_wait(); 21 while (1) { } 22 } 23 24 static void virtio_setup(uint64_t dev_info) 25 { 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 blk_schid.one = 1; 33 34 if (dev_info != -1) { 35 check_devno = true; 36 dev_no = dev_info & 0xffff; 37 debug_print_int("device no. ", dev_no); 38 } 39 40 for (i = 0; i < 0x10000; i++) { 41 blk_schid.sch_no = i; 42 r = stsch_err(blk_schid, &schib); 43 if (r == 3) { 44 break; 45 } 46 if (schib.pmcw.dnv) { 47 if (!check_devno || (schib.pmcw.dev == dev_no)) { 48 if (virtio_is_blk(blk_schid)) { 49 found = true; 50 break; 51 } 52 } 53 } 54 } 55 56 if (!found) { 57 virtio_panic("No virtio-blk device found!\n"); 58 } 59 60 virtio_setup_block(blk_schid); 61 } 62 63 int main(void) 64 { 65 sclp_setup(); 66 debug_print_int("boot reg[7] ", boot_value); 67 virtio_setup(boot_value); 68 69 if (zipl_load() < 0) 70 sclp_print("Failed to load OS from hard disk\n"); 71 disabled_wait(); 72 while (1) { } 73 } 74