192f2ca38SAlexander Graf /* 292f2ca38SAlexander Graf * S390 virtio-ccw loading program 392f2ca38SAlexander Graf * 492f2ca38SAlexander Graf * Copyright (c) 2013 Alexander Graf <agraf@suse.de> 592f2ca38SAlexander Graf * 692f2ca38SAlexander Graf * This work is licensed under the terms of the GNU GPL, version 2 or (at 792f2ca38SAlexander Graf * your option) any later version. See the COPYING file in the top-level 892f2ca38SAlexander Graf * directory. 992f2ca38SAlexander Graf */ 1092f2ca38SAlexander Graf 1192f2ca38SAlexander Graf #include "s390-ccw.h" 1260612d5cSEugene (jno) Dvurechenski #include "virtio.h" 1392f2ca38SAlexander Graf 1492f2ca38SAlexander Graf char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); 15ff151f4eSDominik Dingel uint64_t boot_value; 16*f2879a5cSChristian Borntraeger struct subchannel_id blk_schid = { .one = 1 }; 17*f2879a5cSChristian Borntraeger 18*f2879a5cSChristian Borntraeger /* 19*f2879a5cSChristian Borntraeger * Priniciples of Operations (SA22-7832-09) chapter 17 requires that 20*f2879a5cSChristian Borntraeger * a subsystem-identification is at 184-187 and bytes 188-191 are zero 21*f2879a5cSChristian Borntraeger * after list-directed-IPL and ccw-IPL. 22*f2879a5cSChristian Borntraeger */ 23*f2879a5cSChristian Borntraeger void write_subsystem_identification(void) 24*f2879a5cSChristian Borntraeger { 25*f2879a5cSChristian Borntraeger struct subchannel_id *schid = (struct subchannel_id *) 184; 26*f2879a5cSChristian Borntraeger uint32_t *zeroes = (uint32_t *) 188; 27*f2879a5cSChristian Borntraeger 28*f2879a5cSChristian Borntraeger *schid = blk_schid; 29*f2879a5cSChristian Borntraeger *zeroes = 0; 30*f2879a5cSChristian Borntraeger } 31*f2879a5cSChristian Borntraeger 3292f2ca38SAlexander Graf 3392f2ca38SAlexander Graf void virtio_panic(const char *string) 3492f2ca38SAlexander Graf { 3592f2ca38SAlexander Graf sclp_print(string); 367f61cbc1SChristian Borntraeger disabled_wait(); 3792f2ca38SAlexander Graf while (1) { } 3892f2ca38SAlexander Graf } 3992f2ca38SAlexander Graf 40ff151f4eSDominik Dingel static void virtio_setup(uint64_t dev_info) 4192f2ca38SAlexander Graf { 4222d67ab5SCornelia Huck struct schib schib; 4392f2ca38SAlexander Graf int i; 4492f2ca38SAlexander Graf int r; 4592f2ca38SAlexander Graf bool found = false; 46ff151f4eSDominik Dingel bool check_devno = false; 47ff151f4eSDominik Dingel uint16_t dev_no = -1; 4892f2ca38SAlexander Graf 49ff151f4eSDominik Dingel if (dev_info != -1) { 50ff151f4eSDominik Dingel check_devno = true; 51ff151f4eSDominik Dingel dev_no = dev_info & 0xffff; 52ff151f4eSDominik Dingel debug_print_int("device no. ", dev_no); 53c8cda874SDominik Dingel blk_schid.ssid = (dev_info >> 16) & 0x3; 54c8cda874SDominik Dingel if (blk_schid.ssid != 0) { 55c8cda874SDominik Dingel debug_print_int("ssid ", blk_schid.ssid); 56c8cda874SDominik Dingel if (enable_mss_facility() != 0) { 57c8cda874SDominik Dingel virtio_panic("Failed to enable mss facility\n"); 58c8cda874SDominik Dingel } 59c8cda874SDominik Dingel } 60ff151f4eSDominik Dingel } 61ff151f4eSDominik Dingel 6292f2ca38SAlexander Graf for (i = 0; i < 0x10000; i++) { 6392f2ca38SAlexander Graf blk_schid.sch_no = i; 6422d67ab5SCornelia Huck r = stsch_err(blk_schid, &schib); 6522d67ab5SCornelia Huck if (r == 3) { 6622d67ab5SCornelia Huck break; 6722d67ab5SCornelia Huck } 6822d67ab5SCornelia Huck if (schib.pmcw.dnv) { 69ff151f4eSDominik Dingel if (!check_devno || (schib.pmcw.dev == dev_no)) { 7092f2ca38SAlexander Graf if (virtio_is_blk(blk_schid)) { 7192f2ca38SAlexander Graf found = true; 7292f2ca38SAlexander Graf break; 7392f2ca38SAlexander Graf } 7492f2ca38SAlexander Graf } 7592f2ca38SAlexander Graf } 76ff151f4eSDominik Dingel } 7792f2ca38SAlexander Graf 7892f2ca38SAlexander Graf if (!found) { 7992f2ca38SAlexander Graf virtio_panic("No virtio-blk device found!\n"); 8092f2ca38SAlexander Graf } 8192f2ca38SAlexander Graf 8292f2ca38SAlexander Graf virtio_setup_block(blk_schid); 8360612d5cSEugene (jno) Dvurechenski 8460612d5cSEugene (jno) Dvurechenski if (!virtio_ipl_disk_is_valid()) { 8560612d5cSEugene (jno) Dvurechenski virtio_panic("No valid hard disk detected.\n"); 8660612d5cSEugene (jno) Dvurechenski } 8792f2ca38SAlexander Graf } 8892f2ca38SAlexander Graf 8992f2ca38SAlexander Graf int main(void) 9092f2ca38SAlexander Graf { 9192f2ca38SAlexander Graf sclp_setup(); 92ff151f4eSDominik Dingel debug_print_int("boot reg[7] ", boot_value); 93ff151f4eSDominik Dingel virtio_setup(boot_value); 94ff151f4eSDominik Dingel 9560612d5cSEugene (jno) Dvurechenski zipl_load(); /* no return */ 9660612d5cSEugene (jno) Dvurechenski 9760612d5cSEugene (jno) Dvurechenski virtio_panic("Failed to load OS from hard disk\n"); 9860612d5cSEugene (jno) Dvurechenski return 0; /* make compiler happy */ 9992f2ca38SAlexander Graf } 100