diff options
Diffstat (limited to 'pc-bios/s390-ccw/main.c')
| -rw-r--r-- | pc-bios/s390-ccw/main.c | 190 |
1 files changed, 133 insertions, 57 deletions
diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c index 544851d672..a69c73349e 100644 --- a/pc-bios/s390-ccw/main.c +++ b/pc-bios/s390-ccw/main.c @@ -9,21 +9,27 @@ */ #include "libc.h" +#include "s390-arch.h" #include "s390-ccw.h" +#include "cio.h" #include "virtio.h" +#include "dasd-ipl.h" char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); static SubChannelId blk_schid = { .one = 1 }; -IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE))); static char loadparm_str[LOADPARM_LEN + 1] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 }; QemuIplParameters qipl; +IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE))); +static bool have_iplb; +static uint16_t cutype; +LowCore const *lowcore; /* Yes, this *is* a pointer to address 0 */ #define LOADPARM_PROMPT "PROMPT " #define LOADPARM_EMPTY " " #define BOOT_MENU_FLAG_MASK (QIPL_FLAG_BM_OPTS_CMD | QIPL_FLAG_BM_OPTS_ZIPL) /* - * Priniciples of Operations (SA22-7832-09) chapter 17 requires that + * Principles 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. */ @@ -48,29 +54,64 @@ unsigned int get_loadparm_index(void) return atoui(loadparm_str); } -static bool find_dev(Schib *schib, int dev_no) +/* + * Find the subchannel connected to the given device (dev_no) and fill in the + * subchannel information block (schib) with the connected subchannel's info. + * NOTE: The global variable blk_schid is updated to contain the subchannel + * information. + * + * If the caller gives dev_no=-1 then the user did not specify a boot device. + * In this case we'll just use the first potentially bootable device we find. + */ +static bool find_subch(int dev_no) { + Schib schib; int i, r; + bool is_virtio; for (i = 0; i < 0x10000; i++) { blk_schid.sch_no = i; - r = stsch_err(blk_schid, schib); + r = stsch_err(blk_schid, &schib); if ((r == 3) || (r == -EIO)) { break; } - if (!schib->pmcw.dnv) { - continue; - } - if (!virtio_is_supported(blk_schid)) { + if (!schib.pmcw.dnv) { continue; } - /* Skip net devices since no IPLB is created and therefore no - * no network bootloader has been loaded + + enable_subchannel(blk_schid); + cutype = cu_type(blk_schid); + + /* + * Note: we always have to run virtio_is_supported() here to make + * sure that the vdev.senseid data gets pre-initialized correctly */ - if (virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) { - continue; + is_virtio = virtio_is_supported(blk_schid); + + /* No specific devno given, just return 1st possibly bootable device */ + if (dev_no < 0) { + switch (cutype) { + case CU_TYPE_VIRTIO: + if (is_virtio) { + /* + * Skip net devices since no IPLB is created and therefore + * no network bootloader has been loaded + */ + if (virtio_get_device_type() != VIRTIO_ID_NET) { + return true; + } + } + continue; + case CU_TYPE_DASD_3990: + case CU_TYPE_DASD_2107: + return true; + default: + continue; + } } - if ((dev_no < 0) || (schib->pmcw.dev == dev_no)) { + + /* Caller asked for a specific devno */ + if (schib.pmcw.dev == dev_no) { return true; } } @@ -99,68 +140,88 @@ static void menu_setup(void) } } -static void virtio_setup(void) +/* + * Initialize the channel I/O subsystem so we can talk to our ipl/boot device. + */ +static void css_setup(void) { - Schib schib; - int ssid; - bool found = false; - uint16_t dev_no; - char ldp[] = "LOADPARM=[________]\n"; - VDev *vdev = virtio_get_device(); - QemuIplParameters *early_qipl = (QemuIplParameters *)QIPL_ADDRESS; - /* - * We unconditionally enable mss support. In every sane configuration, - * this will succeed; and even if it doesn't, stsch_err() can deal - * with the consequences. + * Unconditionally enable mss support. In every sane configuration this + * will succeed; and even if it doesn't, stsch_err() can handle it. */ enable_mss_facility(); +} + +/* + * Collect various pieces of information from the hypervisor/hardware that + * we'll use to determine exactly how we'll boot. + */ +static void boot_setup(void) +{ + char lpmsg[] = "LOADPARM=[________]\n"; sclp_get_loadparm_ascii(loadparm_str); - memcpy(ldp + 10, loadparm_str, LOADPARM_LEN); - sclp_print(ldp); + memcpy(lpmsg + 10, loadparm_str, 8); + sclp_print(lpmsg); - memcpy(&qipl, early_qipl, sizeof(QemuIplParameters)); + have_iplb = store_iplb(&iplb); +} - if (store_iplb(&iplb)) { - switch (iplb.pbt) { - case S390_IPL_TYPE_CCW: - dev_no = iplb.ccw.devno; - debug_print_int("device no. ", dev_no); - blk_schid.ssid = iplb.ccw.ssid & 0x3; - debug_print_int("ssid ", blk_schid.ssid); - found = find_dev(&schib, dev_no); - break; - case S390_IPL_TYPE_QEMU_SCSI: - vdev->scsi_device_selected = true; - vdev->selected_scsi_device.channel = iplb.scsi.channel; - vdev->selected_scsi_device.target = iplb.scsi.target; - vdev->selected_scsi_device.lun = iplb.scsi.lun; - blk_schid.ssid = iplb.scsi.ssid & 0x3; - found = find_dev(&schib, iplb.scsi.devno); - break; - default: - panic("List-directed IPL not supported yet!\n"); - } - menu_setup(); - } else { +static void find_boot_device(void) +{ + VDev *vdev = virtio_get_device(); + int ssid; + bool found; + + if (!have_iplb) { for (ssid = 0; ssid < 0x3; ssid++) { blk_schid.ssid = ssid; - found = find_dev(&schib, -1); + found = find_subch(-1); if (found) { - break; + return; } } + panic("Could not find a suitable boot device (none specified)\n"); + } + + switch (iplb.pbt) { + case S390_IPL_TYPE_CCW: + debug_print_int("device no. ", iplb.ccw.devno); + blk_schid.ssid = iplb.ccw.ssid & 0x3; + debug_print_int("ssid ", blk_schid.ssid); + found = find_subch(iplb.ccw.devno); + break; + case S390_IPL_TYPE_QEMU_SCSI: + vdev->scsi_device_selected = true; + vdev->selected_scsi_device.channel = iplb.scsi.channel; + vdev->selected_scsi_device.target = iplb.scsi.target; + vdev->selected_scsi_device.lun = iplb.scsi.lun; + blk_schid.ssid = iplb.scsi.ssid & 0x3; + found = find_subch(iplb.scsi.devno); + break; + default: + panic("List-directed IPL not supported yet!\n"); } - IPL_assert(found, "No virtio device found"); + IPL_assert(found, "Boot device not found\n"); +} + +static void virtio_setup(void) +{ + VDev *vdev = virtio_get_device(); + QemuIplParameters *early_qipl = (QemuIplParameters *)QIPL_ADDRESS; + + memcpy(&qipl, early_qipl, sizeof(QemuIplParameters)); + + if (have_iplb) { + menu_setup(); + } if (virtio_get_device_type() == VIRTIO_ID_NET) { sclp_print("Network boot device detected\n"); vdev->netboot_start_addr = qipl.netboot_start_addr; } else { virtio_blk_setup_device(blk_schid); - IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected"); } } @@ -168,9 +229,24 @@ static void virtio_setup(void) int main(void) { sclp_setup(); - virtio_setup(); - - zipl_load(); /* no return */ + css_setup(); + boot_setup(); + find_boot_device(); + enable_subchannel(blk_schid); + + switch (cutype) { + case CU_TYPE_DASD_3990: + case CU_TYPE_DASD_2107: + dasd_ipl(blk_schid, cutype); /* no return */ + break; + case CU_TYPE_VIRTIO: + virtio_setup(); + zipl_load(); /* no return */ + break; + default: + print_int("Attempting to boot from unexpected device type", cutype); + panic(""); + } panic("Failed to load OS from hard disk\n"); return 0; /* make compiler happy */ |