f2879a5c9e
POP chapter 17 requires to store a subsystem information word at 184 during IPL. Furthermore bytes 188-191 should be zero. The bootmap might contain data blocks that are written to the first page. We have to write these values after we processed the bootmap and before the final IPL. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@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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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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