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 } 80