| /* |
| * S390 virtio-ccw loading program |
| * |
| * Copyright (c) 2013 Alexander Graf <agraf@suse.de> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or (at |
| * your option) any later version. See the COPYING file in the top-level |
| * directory. |
| */ |
| |
| #include "s390-ccw.h" |
| #include "virtio.h" |
| |
| char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); |
| uint64_t boot_value; |
| struct subchannel_id blk_schid = { .one = 1 }; |
| |
| /* |
| * Priniciples of Operations (SA22-7832-09) chapter 17 requires that |
| * a subsystem-identification is at 184-187 and bytes 188-191 are zero |
| * after list-directed-IPL and ccw-IPL. |
| */ |
| void write_subsystem_identification(void) |
| { |
| struct subchannel_id *schid = (struct subchannel_id *) 184; |
| uint32_t *zeroes = (uint32_t *) 188; |
| |
| *schid = blk_schid; |
| *zeroes = 0; |
| } |
| |
| |
| void virtio_panic(const char *string) |
| { |
| sclp_print(string); |
| disabled_wait(); |
| while (1) { } |
| } |
| |
| static void virtio_setup(uint64_t dev_info) |
| { |
| struct schib schib; |
| int i; |
| int r; |
| bool found = false; |
| bool check_devno = false; |
| uint16_t dev_no = -1; |
| |
| if (dev_info != -1) { |
| check_devno = true; |
| dev_no = dev_info & 0xffff; |
| debug_print_int("device no. ", dev_no); |
| blk_schid.ssid = (dev_info >> 16) & 0x3; |
| if (blk_schid.ssid != 0) { |
| debug_print_int("ssid ", blk_schid.ssid); |
| if (enable_mss_facility() != 0) { |
| virtio_panic("Failed to enable mss facility\n"); |
| } |
| } |
| } |
| |
| for (i = 0; i < 0x10000; i++) { |
| blk_schid.sch_no = i; |
| r = stsch_err(blk_schid, &schib); |
| if (r == 3) { |
| break; |
| } |
| if (schib.pmcw.dnv) { |
| if (!check_devno || (schib.pmcw.dev == dev_no)) { |
| if (virtio_is_blk(blk_schid)) { |
| found = true; |
| break; |
| } |
| } |
| } |
| } |
| |
| if (!found) { |
| virtio_panic("No virtio-blk device found!\n"); |
| } |
| |
| virtio_setup_block(blk_schid); |
| |
| if (!virtio_ipl_disk_is_valid()) { |
| virtio_panic("No valid hard disk detected.\n"); |
| } |
| } |
| |
| int main(void) |
| { |
| sclp_setup(); |
| debug_print_int("boot reg[7] ", boot_value); |
| virtio_setup(boot_value); |
| |
| zipl_load(); /* no return */ |
| |
| virtio_panic("Failed to load OS from hard disk\n"); |
| return 0; /* make compiler happy */ |
| } |