192f2ca38SAlexander Graf /* 292f2ca38SAlexander Graf * S390 virtio-ccw loading program 392f2ca38SAlexander Graf * 492f2ca38SAlexander Graf * Copyright (c) 2013 Alexander Graf <agraf@suse.de> 592f2ca38SAlexander Graf * 692f2ca38SAlexander Graf * This work is licensed under the terms of the GNU GPL, version 2 or (at 792f2ca38SAlexander Graf * your option) any later version. See the COPYING file in the top-level 892f2ca38SAlexander Graf * directory. 992f2ca38SAlexander Graf */ 1092f2ca38SAlexander Graf 1192f2ca38SAlexander Graf #include "s390-ccw.h" 1260612d5cSEugene (jno) Dvurechenski #include "virtio.h" 1392f2ca38SAlexander Graf 1492f2ca38SAlexander Graf char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); 15b88d7fa5SEugene (jno) Dvurechenski static SubChannelId blk_schid = { .one = 1 }; 16d046c51dSAlexander Yarygin IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE))); 17f2879a5cSChristian Borntraeger 18f2879a5cSChristian Borntraeger /* 19f2879a5cSChristian Borntraeger * Priniciples of Operations (SA22-7832-09) chapter 17 requires that 20f2879a5cSChristian Borntraeger * a subsystem-identification is at 184-187 and bytes 188-191 are zero 21f2879a5cSChristian Borntraeger * after list-directed-IPL and ccw-IPL. 22f2879a5cSChristian Borntraeger */ 23f2879a5cSChristian Borntraeger void write_subsystem_identification(void) 24f2879a5cSChristian Borntraeger { 25b88d7fa5SEugene (jno) Dvurechenski SubChannelId *schid = (SubChannelId *) 184; 26f2879a5cSChristian Borntraeger uint32_t *zeroes = (uint32_t *) 188; 27f2879a5cSChristian Borntraeger 28f2879a5cSChristian Borntraeger *schid = blk_schid; 29f2879a5cSChristian Borntraeger *zeroes = 0; 30f2879a5cSChristian Borntraeger } 31f2879a5cSChristian Borntraeger 3292f2ca38SAlexander Graf 33c9262e8aSEugene (jno) Dvurechenski void panic(const char *string) 3492f2ca38SAlexander Graf { 3592f2ca38SAlexander Graf sclp_print(string); 367f61cbc1SChristian Borntraeger disabled_wait(); 3792f2ca38SAlexander Graf while (1) { } 3892f2ca38SAlexander Graf } 3992f2ca38SAlexander Graf 40b88d7fa5SEugene (jno) Dvurechenski static bool find_dev(Schib *schib, int dev_no) 4192f2ca38SAlexander Graf { 420f79b89bSAlexander Yarygin int i, r; 43ff151f4eSDominik Dingel 4492f2ca38SAlexander Graf for (i = 0; i < 0x10000; i++) { 4592f2ca38SAlexander Graf blk_schid.sch_no = i; 460f79b89bSAlexander Yarygin r = stsch_err(blk_schid, schib); 470f79b89bSAlexander Yarygin if ((r == 3) || (r == -EIO)) { 4822d67ab5SCornelia Huck break; 4922d67ab5SCornelia Huck } 500f79b89bSAlexander Yarygin if (!schib->pmcw.dnv) { 510f79b89bSAlexander Yarygin continue; 5292f2ca38SAlexander Graf } 53a1102cebSEugene (jno) Dvurechenski if (!virtio_is_supported(blk_schid)) { 540f79b89bSAlexander Yarygin continue; 550f79b89bSAlexander Yarygin } 56*99b72e0fSFarhan Ali /* Skip net devices since no IPLB is created and therefore no 57*99b72e0fSFarhan Ali * no network bootloader has been loaded 58*99b72e0fSFarhan Ali */ 59*99b72e0fSFarhan Ali if (virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) { 60*99b72e0fSFarhan Ali continue; 61*99b72e0fSFarhan Ali } 620f79b89bSAlexander Yarygin if ((dev_no < 0) || (schib->pmcw.dev == dev_no)) { 630f79b89bSAlexander Yarygin return true; 640f79b89bSAlexander Yarygin } 650f79b89bSAlexander Yarygin } 660f79b89bSAlexander Yarygin 670f79b89bSAlexander Yarygin return false; 680f79b89bSAlexander Yarygin } 690f79b89bSAlexander Yarygin 70d046c51dSAlexander Yarygin static void virtio_setup(void) 710f79b89bSAlexander Yarygin { 72b88d7fa5SEugene (jno) Dvurechenski Schib schib; 730f79b89bSAlexander Yarygin int ssid; 740f79b89bSAlexander Yarygin bool found = false; 750f79b89bSAlexander Yarygin uint16_t dev_no; 76*99b72e0fSFarhan Ali VDev *vdev = virtio_get_device(); 770f79b89bSAlexander Yarygin 780f79b89bSAlexander Yarygin /* 790f79b89bSAlexander Yarygin * We unconditionally enable mss support. In every sane configuration, 800f79b89bSAlexander Yarygin * this will succeed; and even if it doesn't, stsch_err() can deal 810f79b89bSAlexander Yarygin * with the consequences. 820f79b89bSAlexander Yarygin */ 830f79b89bSAlexander Yarygin enable_mss_facility(); 840f79b89bSAlexander Yarygin 85d046c51dSAlexander Yarygin if (store_iplb(&iplb)) { 86d046c51dSAlexander Yarygin switch (iplb.pbt) { 87d046c51dSAlexander Yarygin case S390_IPL_TYPE_CCW: 88d046c51dSAlexander Yarygin dev_no = iplb.ccw.devno; 890f79b89bSAlexander Yarygin debug_print_int("device no. ", dev_no); 90d046c51dSAlexander Yarygin blk_schid.ssid = iplb.ccw.ssid & 0x3; 910f79b89bSAlexander Yarygin debug_print_int("ssid ", blk_schid.ssid); 920f79b89bSAlexander Yarygin found = find_dev(&schib, dev_no); 93d046c51dSAlexander Yarygin break; 94b39b7718SEugene (jno) Dvurechenski case S390_IPL_TYPE_QEMU_SCSI: 95b39b7718SEugene (jno) Dvurechenski vdev->scsi_device_selected = true; 96b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.channel = iplb.scsi.channel; 97b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.target = iplb.scsi.target; 98b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.lun = iplb.scsi.lun; 99b39b7718SEugene (jno) Dvurechenski blk_schid.ssid = iplb.scsi.ssid & 0x3; 100b39b7718SEugene (jno) Dvurechenski found = find_dev(&schib, iplb.scsi.devno); 101b39b7718SEugene (jno) Dvurechenski break; 102d046c51dSAlexander Yarygin default: 103d046c51dSAlexander Yarygin panic("List-directed IPL not supported yet!\n"); 104d046c51dSAlexander Yarygin } 1050f79b89bSAlexander Yarygin } else { 1060f79b89bSAlexander Yarygin for (ssid = 0; ssid < 0x3; ssid++) { 1070f79b89bSAlexander Yarygin blk_schid.ssid = ssid; 1080f79b89bSAlexander Yarygin found = find_dev(&schib, -1); 1090f79b89bSAlexander Yarygin if (found) { 1100f79b89bSAlexander Yarygin break; 11192f2ca38SAlexander Graf } 11292f2ca38SAlexander Graf } 113ff151f4eSDominik Dingel } 11492f2ca38SAlexander Graf 11580ba3e24SEugene (jno) Dvurechenski IPL_assert(found, "No virtio device found"); 11692f2ca38SAlexander Graf 117*99b72e0fSFarhan Ali if (virtio_get_device_type() == VIRTIO_ID_NET) { 118*99b72e0fSFarhan Ali sclp_print("Network boot device detected\n"); 119*99b72e0fSFarhan Ali vdev->netboot_start_addr = iplb.ccw.netboot_start_addr; 120*99b72e0fSFarhan Ali } else { 121a1102cebSEugene (jno) Dvurechenski virtio_setup_device(blk_schid); 12260612d5cSEugene (jno) Dvurechenski 12380ba3e24SEugene (jno) Dvurechenski IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected"); 12492f2ca38SAlexander Graf } 125*99b72e0fSFarhan Ali } 12692f2ca38SAlexander Graf 12792f2ca38SAlexander Graf int main(void) 12892f2ca38SAlexander Graf { 12992f2ca38SAlexander Graf sclp_setup(); 130d046c51dSAlexander Yarygin virtio_setup(); 131ff151f4eSDominik Dingel 13260612d5cSEugene (jno) Dvurechenski zipl_load(); /* no return */ 13360612d5cSEugene (jno) Dvurechenski 134c9262e8aSEugene (jno) Dvurechenski panic("Failed to load OS from hard disk\n"); 13560612d5cSEugene (jno) Dvurechenski return 0; /* make compiler happy */ 13692f2ca38SAlexander Graf } 137