299 lines
7.7 KiB
C
299 lines
7.7 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 "libc.h"
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#include "helper.h"
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#include "s390-arch.h"
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#include "s390-ccw.h"
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#include "cio.h"
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#include "virtio.h"
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#include "dasd-ipl.h"
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char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
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static SubChannelId blk_schid = { .one = 1 };
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static char loadparm_str[LOADPARM_LEN + 1];
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QemuIplParameters qipl;
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IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
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static bool have_iplb;
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static uint16_t cutype;
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LowCore *lowcore; /* Yes, this *is* a pointer to address 0 */
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#define LOADPARM_PROMPT "PROMPT "
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#define LOADPARM_EMPTY " "
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#define BOOT_MENU_FLAG_MASK (QIPL_FLAG_BM_OPTS_CMD | QIPL_FLAG_BM_OPTS_ZIPL)
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/*
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* Principles 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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lowcore->subchannel_id = blk_schid.sch_id;
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lowcore->subchannel_nr = blk_schid.sch_no;
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lowcore->io_int_parm = 0;
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}
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void write_iplb_location(void)
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{
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if (cutype == CU_TYPE_VIRTIO && virtio_get_device_type() != VIRTIO_ID_NET) {
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lowcore->ptr_iplb = ptr2u32(&iplb);
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}
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}
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unsigned int get_loadparm_index(void)
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{
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return atoui(loadparm_str);
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}
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static int is_dev_possibly_bootable(int dev_no, int sch_no)
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{
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bool is_virtio;
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Schib schib;
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int r;
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blk_schid.sch_no = sch_no;
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r = stsch_err(blk_schid, &schib);
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if (r == 3 || r == -EIO) {
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return -ENODEV;
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}
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if (!schib.pmcw.dnv) {
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return false;
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}
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enable_subchannel(blk_schid);
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cutype = cu_type(blk_schid);
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/*
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* Note: we always have to run virtio_is_supported() here to make
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* sure that the vdev.senseid data gets pre-initialized correctly
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*/
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is_virtio = virtio_is_supported(blk_schid);
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/* No specific devno given, just return whether the device is possibly bootable */
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if (dev_no < 0) {
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switch (cutype) {
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case CU_TYPE_VIRTIO:
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if (is_virtio) {
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/*
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* Skip net devices since no IPLB is created and therefore
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* no network bootloader has been loaded
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*/
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if (virtio_get_device_type() != VIRTIO_ID_NET) {
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return true;
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}
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}
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return false;
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case CU_TYPE_DASD_3990:
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case CU_TYPE_DASD_2107:
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return true;
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default:
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return false;
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}
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}
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/* Caller asked for a specific devno */
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if (schib.pmcw.dev == dev_no) {
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return true;
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}
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return false;
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}
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/*
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* Find the subchannel connected to the given device (dev_no) and fill in the
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* subchannel information block (schib) with the connected subchannel's info.
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* NOTE: The global variable blk_schid is updated to contain the subchannel
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* information.
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*
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* If the caller gives dev_no=-1 then the user did not specify a boot device.
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* In this case we'll just use the first potentially bootable device we find.
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*/
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static bool find_subch(int dev_no)
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{
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int i, r;
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for (i = 0; i < 0x10000; i++) {
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r = is_dev_possibly_bootable(dev_no, i);
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if (r < 0) {
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break;
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}
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if (r == true) {
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return true;
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}
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}
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return false;
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}
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static void menu_setup(void)
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{
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if (memcmp(loadparm_str, LOADPARM_PROMPT, LOADPARM_LEN) == 0) {
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menu_set_parms(QIPL_FLAG_BM_OPTS_CMD, 0);
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return;
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}
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/* If loadparm was set to any other value, then do not enable menu */
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if (memcmp(loadparm_str, LOADPARM_EMPTY, LOADPARM_LEN) != 0) {
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return;
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}
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switch (iplb.pbt) {
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case S390_IPL_TYPE_CCW:
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case S390_IPL_TYPE_QEMU_SCSI:
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menu_set_parms(qipl.qipl_flags & BOOT_MENU_FLAG_MASK,
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qipl.boot_menu_timeout);
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return;
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}
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}
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/*
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* Initialize the channel I/O subsystem so we can talk to our ipl/boot device.
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*/
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static void css_setup(void)
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{
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/*
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* Unconditionally enable mss support. In every sane configuration this
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* will succeed; and even if it doesn't, stsch_err() can handle it.
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*/
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enable_mss_facility();
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}
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/*
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* Collect various pieces of information from the hypervisor/hardware that
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* we'll use to determine exactly how we'll boot.
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*/
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static void boot_setup(void)
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{
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char lpmsg[] = "LOADPARM=[________]\n";
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sclp_get_loadparm_ascii(loadparm_str);
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memcpy(lpmsg + 10, loadparm_str, 8);
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sclp_print(lpmsg);
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/*
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* Clear out any potential S390EP magic (see jump_to_low_kernel()),
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* so we don't taint our decision-making process during a reboot.
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*/
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memset((char *)S390EP, 0, 6);
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have_iplb = store_iplb(&iplb);
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}
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static void find_boot_device(void)
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{
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VDev *vdev = virtio_get_device();
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bool found;
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switch (iplb.pbt) {
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case S390_IPL_TYPE_CCW:
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debug_print_int("device no. ", iplb.ccw.devno);
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blk_schid.ssid = iplb.ccw.ssid & 0x3;
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debug_print_int("ssid ", blk_schid.ssid);
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found = find_subch(iplb.ccw.devno);
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break;
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case S390_IPL_TYPE_QEMU_SCSI:
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vdev->scsi_device_selected = true;
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vdev->selected_scsi_device.channel = iplb.scsi.channel;
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vdev->selected_scsi_device.target = iplb.scsi.target;
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vdev->selected_scsi_device.lun = iplb.scsi.lun;
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blk_schid.ssid = iplb.scsi.ssid & 0x3;
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found = find_subch(iplb.scsi.devno);
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break;
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default:
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panic("List-directed IPL not supported yet!\n");
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}
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IPL_assert(found, "Boot device not found\n");
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}
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static int virtio_setup(void)
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{
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VDev *vdev = virtio_get_device();
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QemuIplParameters *early_qipl = (QemuIplParameters *)QIPL_ADDRESS;
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memcpy(&qipl, early_qipl, sizeof(QemuIplParameters));
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if (have_iplb) {
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menu_setup();
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}
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if (virtio_get_device_type() == VIRTIO_ID_NET) {
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sclp_print("Network boot device detected\n");
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vdev->netboot_start_addr = qipl.netboot_start_addr;
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} else {
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int ret = virtio_blk_setup_device(blk_schid);
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if (ret) {
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return ret;
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}
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IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected");
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}
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return 0;
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}
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static void ipl_boot_device(void)
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{
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switch (cutype) {
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case CU_TYPE_DASD_3990:
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case CU_TYPE_DASD_2107:
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dasd_ipl(blk_schid, cutype); /* no return */
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break;
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case CU_TYPE_VIRTIO:
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if (virtio_setup() == 0) {
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zipl_load(); /* Only returns in case of errors */
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}
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break;
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default:
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print_int("Attempting to boot from unexpected device type", cutype);
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panic("\nBoot failed.\n");
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}
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}
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/*
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* No boot device has been specified, so we have to scan through the
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* channels to find one.
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*/
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static void probe_boot_device(void)
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{
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int ssid, sch_no, ret;
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for (ssid = 0; ssid < 0x3; ssid++) {
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blk_schid.ssid = ssid;
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for (sch_no = 0; sch_no < 0x10000; sch_no++) {
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ret = is_dev_possibly_bootable(-1, sch_no);
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if (ret < 0) {
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break;
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}
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if (ret == true) {
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ipl_boot_device(); /* Only returns if unsuccessful */
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}
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}
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}
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sclp_print("Could not find a suitable boot device (none specified)\n");
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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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css_setup();
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boot_setup();
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if (have_iplb) {
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find_boot_device();
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ipl_boot_device();
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} else {
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probe_boot_device();
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}
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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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