f17a84300f
Fix some sparse warnings in the s390-ccw bios. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/*
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* S390 virtio-ccw loading program
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*
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* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include "s390-ccw.h"
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#include "virtio.h"
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char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
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uint64_t boot_value;
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static struct subchannel_id blk_schid = { .one = 1 };
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/*
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* Priniciples of Operations (SA22-7832-09) chapter 17 requires that
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* a subsystem-identification is at 184-187 and bytes 188-191 are zero
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* after list-directed-IPL and ccw-IPL.
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*/
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void write_subsystem_identification(void)
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{
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struct subchannel_id *schid = (struct subchannel_id *) 184;
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uint32_t *zeroes = (uint32_t *) 188;
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*schid = blk_schid;
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*zeroes = 0;
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}
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void virtio_panic(const char *string)
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{
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sclp_print(string);
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disabled_wait();
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while (1) { }
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}
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static void virtio_setup(uint64_t dev_info)
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{
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struct schib schib;
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int i;
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int r;
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bool found = false;
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bool check_devno = false;
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uint16_t dev_no = -1;
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if (dev_info != -1) {
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check_devno = true;
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dev_no = dev_info & 0xffff;
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debug_print_int("device no. ", dev_no);
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blk_schid.ssid = (dev_info >> 16) & 0x3;
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if (blk_schid.ssid != 0) {
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debug_print_int("ssid ", blk_schid.ssid);
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if (enable_mss_facility() != 0) {
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virtio_panic("Failed to enable mss facility\n");
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}
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}
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}
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for (i = 0; i < 0x10000; i++) {
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blk_schid.sch_no = i;
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r = stsch_err(blk_schid, &schib);
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if (r == 3) {
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break;
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}
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if (schib.pmcw.dnv) {
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if (!check_devno || (schib.pmcw.dev == dev_no)) {
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if (virtio_is_blk(blk_schid)) {
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found = true;
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break;
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}
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}
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}
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}
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if (!found) {
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virtio_panic("No virtio-blk device found!\n");
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}
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virtio_setup_block(blk_schid);
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if (!virtio_ipl_disk_is_valid()) {
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virtio_panic("No valid hard disk detected.\n");
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}
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}
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int main(void)
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{
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sclp_setup();
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debug_print_int("boot reg[7] ", boot_value);
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virtio_setup(boot_value);
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zipl_load(); /* no return */
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virtio_panic("Failed to load OS from hard disk\n");
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return 0; /* make compiler happy */
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}
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