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))); 18*a0e11b61SCollin Walling static char loadparm_str[LOADPARM_LEN + 1] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 }; 19118ee80fSCollin L. Walling QemuIplParameters qipl; 20f2879a5cSChristian Borntraeger 219eaa654aSCollin L. Walling #define LOADPARM_PROMPT "PROMPT " 22074afe60SCollin Walling #define LOADPARM_EMPTY " " 2353b310ceSCollin L. Walling #define BOOT_MENU_FLAG_MASK (QIPL_FLAG_BM_OPTS_CMD | QIPL_FLAG_BM_OPTS_ZIPL) 249eaa654aSCollin L. Walling 25f2879a5cSChristian Borntraeger /* 26f2879a5cSChristian Borntraeger * Priniciples of Operations (SA22-7832-09) chapter 17 requires that 27f2879a5cSChristian Borntraeger * a subsystem-identification is at 184-187 and bytes 188-191 are zero 28f2879a5cSChristian Borntraeger * after list-directed-IPL and ccw-IPL. 29f2879a5cSChristian Borntraeger */ 30f2879a5cSChristian Borntraeger void write_subsystem_identification(void) 31f2879a5cSChristian Borntraeger { 32b88d7fa5SEugene (jno) Dvurechenski SubChannelId *schid = (SubChannelId *) 184; 33f2879a5cSChristian Borntraeger uint32_t *zeroes = (uint32_t *) 188; 34f2879a5cSChristian Borntraeger 35f2879a5cSChristian Borntraeger *schid = blk_schid; 36f2879a5cSChristian Borntraeger *zeroes = 0; 37f2879a5cSChristian Borntraeger } 38f2879a5cSChristian Borntraeger 39c9262e8aSEugene (jno) Dvurechenski void panic(const char *string) 4092f2ca38SAlexander Graf { 4192f2ca38SAlexander Graf sclp_print(string); 427f61cbc1SChristian Borntraeger disabled_wait(); 4392f2ca38SAlexander Graf while (1) { } 4492f2ca38SAlexander Graf } 4592f2ca38SAlexander Graf 4695fa1af8SFarhan Ali unsigned int get_loadparm_index(void) 4795fa1af8SFarhan Ali { 48074afe60SCollin Walling return atoui(loadparm_str); 4995fa1af8SFarhan Ali } 5095fa1af8SFarhan Ali 51b88d7fa5SEugene (jno) Dvurechenski static bool find_dev(Schib *schib, int dev_no) 5292f2ca38SAlexander Graf { 530f79b89bSAlexander Yarygin int i, r; 54ff151f4eSDominik Dingel 5592f2ca38SAlexander Graf for (i = 0; i < 0x10000; i++) { 5692f2ca38SAlexander Graf blk_schid.sch_no = i; 570f79b89bSAlexander Yarygin r = stsch_err(blk_schid, schib); 580f79b89bSAlexander Yarygin if ((r == 3) || (r == -EIO)) { 5922d67ab5SCornelia Huck break; 6022d67ab5SCornelia Huck } 610f79b89bSAlexander Yarygin if (!schib->pmcw.dnv) { 620f79b89bSAlexander Yarygin continue; 6392f2ca38SAlexander Graf } 64a1102cebSEugene (jno) Dvurechenski if (!virtio_is_supported(blk_schid)) { 650f79b89bSAlexander Yarygin continue; 660f79b89bSAlexander Yarygin } 6799b72e0fSFarhan Ali /* Skip net devices since no IPLB is created and therefore no 6899b72e0fSFarhan Ali * no network bootloader has been loaded 6999b72e0fSFarhan Ali */ 7099b72e0fSFarhan Ali if (virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) { 7199b72e0fSFarhan Ali continue; 7299b72e0fSFarhan Ali } 730f79b89bSAlexander Yarygin if ((dev_no < 0) || (schib->pmcw.dev == dev_no)) { 740f79b89bSAlexander Yarygin return true; 750f79b89bSAlexander Yarygin } 760f79b89bSAlexander Yarygin } 770f79b89bSAlexander Yarygin 780f79b89bSAlexander Yarygin return false; 790f79b89bSAlexander Yarygin } 800f79b89bSAlexander Yarygin 819eaa654aSCollin L. Walling static void menu_setup(void) 829eaa654aSCollin L. Walling { 83*a0e11b61SCollin Walling if (memcmp(loadparm_str, LOADPARM_PROMPT, LOADPARM_LEN) == 0) { 849eaa654aSCollin L. Walling menu_set_parms(QIPL_FLAG_BM_OPTS_CMD, 0); 859eaa654aSCollin L. Walling return; 869eaa654aSCollin L. Walling } 879eaa654aSCollin L. Walling 889eaa654aSCollin L. Walling /* If loadparm was set to any other value, then do not enable menu */ 89*a0e11b61SCollin Walling if (memcmp(loadparm_str, LOADPARM_EMPTY, LOADPARM_LEN) != 0) { 909eaa654aSCollin L. Walling return; 919eaa654aSCollin L. Walling } 929eaa654aSCollin L. Walling 939eaa654aSCollin L. Walling switch (iplb.pbt) { 949eaa654aSCollin L. Walling case S390_IPL_TYPE_CCW: 95ffb4a1c8SCollin L. Walling case S390_IPL_TYPE_QEMU_SCSI: 9653b310ceSCollin L. Walling menu_set_parms(qipl.qipl_flags & BOOT_MENU_FLAG_MASK, 979eaa654aSCollin L. Walling qipl.boot_menu_timeout); 989eaa654aSCollin L. Walling return; 999eaa654aSCollin L. Walling } 1009eaa654aSCollin L. Walling } 1019eaa654aSCollin L. Walling 102d046c51dSAlexander Yarygin static void virtio_setup(void) 1030f79b89bSAlexander Yarygin { 104b88d7fa5SEugene (jno) Dvurechenski Schib schib; 1050f79b89bSAlexander Yarygin int ssid; 1060f79b89bSAlexander Yarygin bool found = false; 1070f79b89bSAlexander Yarygin uint16_t dev_no; 10895fa1af8SFarhan Ali char ldp[] = "LOADPARM=[________]\n"; 10999b72e0fSFarhan Ali VDev *vdev = virtio_get_device(); 110118ee80fSCollin L. Walling QemuIplParameters *early_qipl = (QemuIplParameters *)QIPL_ADDRESS; 1110f79b89bSAlexander Yarygin 1120f79b89bSAlexander Yarygin /* 1130f79b89bSAlexander Yarygin * We unconditionally enable mss support. In every sane configuration, 1140f79b89bSAlexander Yarygin * this will succeed; and even if it doesn't, stsch_err() can deal 1150f79b89bSAlexander Yarygin * with the consequences. 1160f79b89bSAlexander Yarygin */ 1170f79b89bSAlexander Yarygin enable_mss_facility(); 1180f79b89bSAlexander Yarygin 119074afe60SCollin Walling sclp_get_loadparm_ascii(loadparm_str); 120*a0e11b61SCollin Walling memcpy(ldp + 10, loadparm_str, LOADPARM_LEN); 12195fa1af8SFarhan Ali sclp_print(ldp); 12295fa1af8SFarhan Ali 123118ee80fSCollin L. Walling memcpy(&qipl, early_qipl, sizeof(QemuIplParameters)); 124118ee80fSCollin L. Walling 125d046c51dSAlexander Yarygin if (store_iplb(&iplb)) { 126d046c51dSAlexander Yarygin switch (iplb.pbt) { 127d046c51dSAlexander Yarygin case S390_IPL_TYPE_CCW: 128d046c51dSAlexander Yarygin dev_no = iplb.ccw.devno; 1290f79b89bSAlexander Yarygin debug_print_int("device no. ", dev_no); 130d046c51dSAlexander Yarygin blk_schid.ssid = iplb.ccw.ssid & 0x3; 1310f79b89bSAlexander Yarygin debug_print_int("ssid ", blk_schid.ssid); 1320f79b89bSAlexander Yarygin found = find_dev(&schib, dev_no); 133d046c51dSAlexander Yarygin break; 134b39b7718SEugene (jno) Dvurechenski case S390_IPL_TYPE_QEMU_SCSI: 135b39b7718SEugene (jno) Dvurechenski vdev->scsi_device_selected = true; 136b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.channel = iplb.scsi.channel; 137b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.target = iplb.scsi.target; 138b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.lun = iplb.scsi.lun; 139b39b7718SEugene (jno) Dvurechenski blk_schid.ssid = iplb.scsi.ssid & 0x3; 140b39b7718SEugene (jno) Dvurechenski found = find_dev(&schib, iplb.scsi.devno); 141b39b7718SEugene (jno) Dvurechenski break; 142d046c51dSAlexander Yarygin default: 143d046c51dSAlexander Yarygin panic("List-directed IPL not supported yet!\n"); 144d046c51dSAlexander Yarygin } 1459eaa654aSCollin L. Walling menu_setup(); 1460f79b89bSAlexander Yarygin } else { 1470f79b89bSAlexander Yarygin for (ssid = 0; ssid < 0x3; ssid++) { 1480f79b89bSAlexander Yarygin blk_schid.ssid = ssid; 1490f79b89bSAlexander Yarygin found = find_dev(&schib, -1); 1500f79b89bSAlexander Yarygin if (found) { 1510f79b89bSAlexander Yarygin break; 15292f2ca38SAlexander Graf } 15392f2ca38SAlexander Graf } 154ff151f4eSDominik Dingel } 15592f2ca38SAlexander Graf 15680ba3e24SEugene (jno) Dvurechenski IPL_assert(found, "No virtio device found"); 15792f2ca38SAlexander Graf 15899b72e0fSFarhan Ali if (virtio_get_device_type() == VIRTIO_ID_NET) { 15999b72e0fSFarhan Ali sclp_print("Network boot device detected\n"); 160118ee80fSCollin L. Walling vdev->netboot_start_addr = qipl.netboot_start_addr; 16199b72e0fSFarhan Ali } else { 162867e039aSThomas Huth virtio_blk_setup_device(blk_schid); 16360612d5cSEugene (jno) Dvurechenski 16480ba3e24SEugene (jno) Dvurechenski IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected"); 16592f2ca38SAlexander Graf } 16699b72e0fSFarhan Ali } 16792f2ca38SAlexander Graf 16892f2ca38SAlexander Graf int main(void) 16992f2ca38SAlexander Graf { 17092f2ca38SAlexander Graf sclp_setup(); 171d046c51dSAlexander Yarygin virtio_setup(); 172ff151f4eSDominik Dingel 17360612d5cSEugene (jno) Dvurechenski zipl_load(); /* no return */ 17460612d5cSEugene (jno) Dvurechenski 175c9262e8aSEugene (jno) Dvurechenski panic("Failed to load OS from hard disk\n"); 17660612d5cSEugene (jno) Dvurechenski return 0; /* make compiler happy */ 17792f2ca38SAlexander Graf } 178