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 1190806fecSThomas Huth #include "libc.h" 1292f2ca38SAlexander Graf #include "s390-ccw.h" 1360612d5cSEugene (jno) Dvurechenski #include "virtio.h" 1492f2ca38SAlexander Graf 1592f2ca38SAlexander Graf char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); 16b88d7fa5SEugene (jno) Dvurechenski static SubChannelId blk_schid = { .one = 1 }; 17d046c51dSAlexander Yarygin IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE))); 1895fa1af8SFarhan Ali static char loadparm[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 19*118ee80fSCollin L. Walling QemuIplParameters qipl; 20f2879a5cSChristian Borntraeger 21f2879a5cSChristian Borntraeger /* 22f2879a5cSChristian Borntraeger * Priniciples of Operations (SA22-7832-09) chapter 17 requires that 23f2879a5cSChristian Borntraeger * a subsystem-identification is at 184-187 and bytes 188-191 are zero 24f2879a5cSChristian Borntraeger * after list-directed-IPL and ccw-IPL. 25f2879a5cSChristian Borntraeger */ 26f2879a5cSChristian Borntraeger void write_subsystem_identification(void) 27f2879a5cSChristian Borntraeger { 28b88d7fa5SEugene (jno) Dvurechenski SubChannelId *schid = (SubChannelId *) 184; 29f2879a5cSChristian Borntraeger uint32_t *zeroes = (uint32_t *) 188; 30f2879a5cSChristian Borntraeger 31f2879a5cSChristian Borntraeger *schid = blk_schid; 32f2879a5cSChristian Borntraeger *zeroes = 0; 33f2879a5cSChristian Borntraeger } 34f2879a5cSChristian Borntraeger 35c9262e8aSEugene (jno) Dvurechenski void panic(const char *string) 3692f2ca38SAlexander Graf { 3792f2ca38SAlexander Graf sclp_print(string); 387f61cbc1SChristian Borntraeger disabled_wait(); 3992f2ca38SAlexander Graf while (1) { } 4092f2ca38SAlexander Graf } 4192f2ca38SAlexander Graf 4295fa1af8SFarhan Ali unsigned int get_loadparm_index(void) 4395fa1af8SFarhan Ali { 44fc0e2087SCollin L. Walling return atoui(loadparm); 4595fa1af8SFarhan Ali } 4695fa1af8SFarhan Ali 47b88d7fa5SEugene (jno) Dvurechenski static bool find_dev(Schib *schib, int dev_no) 4892f2ca38SAlexander Graf { 490f79b89bSAlexander Yarygin int i, r; 50ff151f4eSDominik Dingel 5192f2ca38SAlexander Graf for (i = 0; i < 0x10000; i++) { 5292f2ca38SAlexander Graf blk_schid.sch_no = i; 530f79b89bSAlexander Yarygin r = stsch_err(blk_schid, schib); 540f79b89bSAlexander Yarygin if ((r == 3) || (r == -EIO)) { 5522d67ab5SCornelia Huck break; 5622d67ab5SCornelia Huck } 570f79b89bSAlexander Yarygin if (!schib->pmcw.dnv) { 580f79b89bSAlexander Yarygin continue; 5992f2ca38SAlexander Graf } 60a1102cebSEugene (jno) Dvurechenski if (!virtio_is_supported(blk_schid)) { 610f79b89bSAlexander Yarygin continue; 620f79b89bSAlexander Yarygin } 6399b72e0fSFarhan Ali /* Skip net devices since no IPLB is created and therefore no 6499b72e0fSFarhan Ali * no network bootloader has been loaded 6599b72e0fSFarhan Ali */ 6699b72e0fSFarhan Ali if (virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) { 6799b72e0fSFarhan Ali continue; 6899b72e0fSFarhan Ali } 690f79b89bSAlexander Yarygin if ((dev_no < 0) || (schib->pmcw.dev == dev_no)) { 700f79b89bSAlexander Yarygin return true; 710f79b89bSAlexander Yarygin } 720f79b89bSAlexander Yarygin } 730f79b89bSAlexander Yarygin 740f79b89bSAlexander Yarygin return false; 750f79b89bSAlexander Yarygin } 760f79b89bSAlexander Yarygin 77d046c51dSAlexander Yarygin static void virtio_setup(void) 780f79b89bSAlexander Yarygin { 79b88d7fa5SEugene (jno) Dvurechenski Schib schib; 800f79b89bSAlexander Yarygin int ssid; 810f79b89bSAlexander Yarygin bool found = false; 820f79b89bSAlexander Yarygin uint16_t dev_no; 8395fa1af8SFarhan Ali char ldp[] = "LOADPARM=[________]\n"; 8499b72e0fSFarhan Ali VDev *vdev = virtio_get_device(); 85*118ee80fSCollin L. Walling QemuIplParameters *early_qipl = (QemuIplParameters *)QIPL_ADDRESS; 860f79b89bSAlexander Yarygin 870f79b89bSAlexander Yarygin /* 880f79b89bSAlexander Yarygin * We unconditionally enable mss support. In every sane configuration, 890f79b89bSAlexander Yarygin * this will succeed; and even if it doesn't, stsch_err() can deal 900f79b89bSAlexander Yarygin * with the consequences. 910f79b89bSAlexander Yarygin */ 920f79b89bSAlexander Yarygin enable_mss_facility(); 930f79b89bSAlexander Yarygin 9495fa1af8SFarhan Ali sclp_get_loadparm_ascii(loadparm); 9595fa1af8SFarhan Ali memcpy(ldp + 10, loadparm, 8); 9695fa1af8SFarhan Ali sclp_print(ldp); 9795fa1af8SFarhan Ali 98*118ee80fSCollin L. Walling memcpy(&qipl, early_qipl, sizeof(QemuIplParameters)); 99*118ee80fSCollin L. Walling 100d046c51dSAlexander Yarygin if (store_iplb(&iplb)) { 101d046c51dSAlexander Yarygin switch (iplb.pbt) { 102d046c51dSAlexander Yarygin case S390_IPL_TYPE_CCW: 103d046c51dSAlexander Yarygin dev_no = iplb.ccw.devno; 1040f79b89bSAlexander Yarygin debug_print_int("device no. ", dev_no); 105d046c51dSAlexander Yarygin blk_schid.ssid = iplb.ccw.ssid & 0x3; 1060f79b89bSAlexander Yarygin debug_print_int("ssid ", blk_schid.ssid); 1070f79b89bSAlexander Yarygin found = find_dev(&schib, dev_no); 108d046c51dSAlexander Yarygin break; 109b39b7718SEugene (jno) Dvurechenski case S390_IPL_TYPE_QEMU_SCSI: 110b39b7718SEugene (jno) Dvurechenski vdev->scsi_device_selected = true; 111b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.channel = iplb.scsi.channel; 112b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.target = iplb.scsi.target; 113b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.lun = iplb.scsi.lun; 114b39b7718SEugene (jno) Dvurechenski blk_schid.ssid = iplb.scsi.ssid & 0x3; 115b39b7718SEugene (jno) Dvurechenski found = find_dev(&schib, iplb.scsi.devno); 116b39b7718SEugene (jno) Dvurechenski break; 117d046c51dSAlexander Yarygin default: 118d046c51dSAlexander Yarygin panic("List-directed IPL not supported yet!\n"); 119d046c51dSAlexander Yarygin } 1200f79b89bSAlexander Yarygin } else { 1210f79b89bSAlexander Yarygin for (ssid = 0; ssid < 0x3; ssid++) { 1220f79b89bSAlexander Yarygin blk_schid.ssid = ssid; 1230f79b89bSAlexander Yarygin found = find_dev(&schib, -1); 1240f79b89bSAlexander Yarygin if (found) { 1250f79b89bSAlexander Yarygin break; 12692f2ca38SAlexander Graf } 12792f2ca38SAlexander Graf } 128ff151f4eSDominik Dingel } 12992f2ca38SAlexander Graf 13080ba3e24SEugene (jno) Dvurechenski IPL_assert(found, "No virtio device found"); 13192f2ca38SAlexander Graf 13299b72e0fSFarhan Ali if (virtio_get_device_type() == VIRTIO_ID_NET) { 13399b72e0fSFarhan Ali sclp_print("Network boot device detected\n"); 134*118ee80fSCollin L. Walling vdev->netboot_start_addr = qipl.netboot_start_addr; 13599b72e0fSFarhan Ali } else { 136867e039aSThomas Huth virtio_blk_setup_device(blk_schid); 13760612d5cSEugene (jno) Dvurechenski 13880ba3e24SEugene (jno) Dvurechenski IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected"); 13992f2ca38SAlexander Graf } 14099b72e0fSFarhan Ali } 14192f2ca38SAlexander Graf 14292f2ca38SAlexander Graf int main(void) 14392f2ca38SAlexander Graf { 14492f2ca38SAlexander Graf sclp_setup(); 145d046c51dSAlexander Yarygin virtio_setup(); 146ff151f4eSDominik Dingel 14760612d5cSEugene (jno) Dvurechenski zipl_load(); /* no return */ 14860612d5cSEugene (jno) Dvurechenski 149c9262e8aSEugene (jno) Dvurechenski panic("Failed to load OS from hard disk\n"); 15060612d5cSEugene (jno) Dvurechenski return 0; /* make compiler happy */ 15192f2ca38SAlexander Graf } 152