diff options
Diffstat (limited to 'pc-bios/s390-ccw/main.c')
| -rw-r--r-- | pc-bios/s390-ccw/main.c | 172 |
1 files changed, 106 insertions, 66 deletions
diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c index 146a50760b..43c792cf95 100644 --- a/pc-bios/s390-ccw/main.c +++ b/pc-bios/s390-ccw/main.c @@ -51,6 +51,60 @@ unsigned int get_loadparm_index(void) return atoui(loadparm_str); } +static int is_dev_possibly_bootable(int dev_no, int sch_no) +{ + bool is_virtio; + Schib schib; + int r; + + blk_schid.sch_no = sch_no; + r = stsch_err(blk_schid, &schib); + if (r == 3 || r == -EIO) { + return -ENODEV; + } + if (!schib.pmcw.dnv) { + return false; + } + + 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 + */ + is_virtio = virtio_is_supported(blk_schid); + + /* No specific devno given, just return whether the device is possibly bootable */ + 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; + } + } + return false; + case CU_TYPE_DASD_3990: + case CU_TYPE_DASD_2107: + return true; + default: + return false; + } + } + + /* Caller asked for a specific devno */ + if (schib.pmcw.dev == dev_no) { + return true; + } + + return false; +} + /* * Find the subchannel connected to the given device (dev_no) and fill in the * subchannel information block (schib) with the connected subchannel's info. @@ -62,53 +116,14 @@ unsigned int get_loadparm_index(void) */ 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); - if ((r == 3) || (r == -EIO)) { + r = is_dev_possibly_bootable(dev_no, i); + if (r < 0) { break; } - if (!schib.pmcw.dnv) { - continue; - } - - 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 - */ - 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; - } - } - - /* Caller asked for a specific devno */ - if (schib.pmcw.dev == dev_no) { + if (r == true) { return true; } } @@ -167,20 +182,8 @@ static void boot_setup(void) 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_subch(-1); - if (found) { - 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); @@ -203,7 +206,7 @@ static void find_boot_device(void) IPL_assert(found, "Boot device not found\n"); } -static void virtio_setup(void) +static int virtio_setup(void) { VDev *vdev = virtio_get_device(); QemuIplParameters *early_qipl = (QemuIplParameters *)QIPL_ADDRESS; @@ -218,31 +221,68 @@ static void virtio_setup(void) sclp_print("Network boot device detected\n"); vdev->netboot_start_addr = qipl.netboot_start_addr; } else { - virtio_blk_setup_device(blk_schid); + int ret = virtio_blk_setup_device(blk_schid); + if (ret) { + return ret; + } IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected"); } + + return 0; } -int main(void) +static void ipl_boot_device(void) { - sclp_setup(); - 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 */ + if (virtio_setup() == 0) { + zipl_load(); /* Only returns in case of errors */ + } break; default: print_int("Attempting to boot from unexpected device type", cutype); - panic(""); + panic("\nBoot failed.\n"); + } +} + +/* + * No boot device has been specified, so we have to scan through the + * channels to find one. + */ +static void probe_boot_device(void) +{ + int ssid, sch_no, ret; + + for (ssid = 0; ssid < 0x3; ssid++) { + blk_schid.ssid = ssid; + for (sch_no = 0; sch_no < 0x10000; sch_no++) { + ret = is_dev_possibly_bootable(-1, sch_no); + if (ret < 0) { + break; + } + if (ret == true) { + ipl_boot_device(); /* Only returns if unsuccessful */ + } + } + } + + sclp_print("Could not find a suitable boot device (none specified)\n"); +} + +int main(void) +{ + sclp_setup(); + css_setup(); + boot_setup(); + if (have_iplb) { + find_boot_device(); + ipl_boot_device(); + } else { + probe_boot_device(); } panic("Failed to load OS from hard disk\n"); |