diff options
Diffstat (limited to 'pc-bios/s390-ccw/main.c')
-rw-r--r-- | pc-bios/s390-ccw/main.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c new file mode 100644 index 000000000..c5d533231 --- /dev/null +++ b/pc-bios/s390-ccw/main.c @@ -0,0 +1,80 @@ +/* + * 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" + +struct subchannel_id blk_schid; +char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); +uint64_t boot_value; + +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; + blk_schid.one = 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); +} + +int main(void) +{ + sclp_setup(); + debug_print_int("boot reg[7] ", boot_value); + virtio_setup(boot_value); + + if (zipl_load() < 0) + sclp_print("Failed to load OS from hard disk\n"); + disabled_wait(); + while (1) { } +} |