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" 12*c95df3d1SJason J. Herne #include "s390-arch.h" 1392f2ca38SAlexander Graf #include "s390-ccw.h" 14120d0410SJason J. Herne #include "cio.h" 1560612d5cSEugene (jno) Dvurechenski #include "virtio.h" 1692f2ca38SAlexander Graf 1792f2ca38SAlexander Graf char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); 18b88d7fa5SEugene (jno) Dvurechenski static SubChannelId blk_schid = { .one = 1 }; 19a0e11b61SCollin Walling static char loadparm_str[LOADPARM_LEN + 1] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 }; 20118ee80fSCollin L. Walling QemuIplParameters qipl; 21a5f6e097SJason J. Herne IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE))); 22a5f6e097SJason J. Herne static bool have_iplb; 23*c95df3d1SJason J. Herne LowCore const *lowcore; /* Yes, this *is* a pointer to address 0 */ 24f2879a5cSChristian Borntraeger 259eaa654aSCollin L. Walling #define LOADPARM_PROMPT "PROMPT " 26074afe60SCollin Walling #define LOADPARM_EMPTY " " 2753b310ceSCollin L. Walling #define BOOT_MENU_FLAG_MASK (QIPL_FLAG_BM_OPTS_CMD | QIPL_FLAG_BM_OPTS_ZIPL) 289eaa654aSCollin L. Walling 29f2879a5cSChristian Borntraeger /* 30a5f6e097SJason J. Herne * Principles of Operations (SA22-7832-09) chapter 17 requires that 31f2879a5cSChristian Borntraeger * a subsystem-identification is at 184-187 and bytes 188-191 are zero 32f2879a5cSChristian Borntraeger * after list-directed-IPL and ccw-IPL. 33f2879a5cSChristian Borntraeger */ 34f2879a5cSChristian Borntraeger void write_subsystem_identification(void) 35f2879a5cSChristian Borntraeger { 36b88d7fa5SEugene (jno) Dvurechenski SubChannelId *schid = (SubChannelId *) 184; 37f2879a5cSChristian Borntraeger uint32_t *zeroes = (uint32_t *) 188; 38f2879a5cSChristian Borntraeger 39f2879a5cSChristian Borntraeger *schid = blk_schid; 40f2879a5cSChristian Borntraeger *zeroes = 0; 41f2879a5cSChristian Borntraeger } 42f2879a5cSChristian Borntraeger 43c9262e8aSEugene (jno) Dvurechenski void panic(const char *string) 4492f2ca38SAlexander Graf { 4592f2ca38SAlexander Graf sclp_print(string); 467f61cbc1SChristian Borntraeger disabled_wait(); 4792f2ca38SAlexander Graf while (1) { } 4892f2ca38SAlexander Graf } 4992f2ca38SAlexander Graf 5095fa1af8SFarhan Ali unsigned int get_loadparm_index(void) 5195fa1af8SFarhan Ali { 52074afe60SCollin Walling return atoui(loadparm_str); 5395fa1af8SFarhan Ali } 5495fa1af8SFarhan Ali 55b88d7fa5SEugene (jno) Dvurechenski static bool find_dev(Schib *schib, int dev_no) 5692f2ca38SAlexander Graf { 570f79b89bSAlexander Yarygin int i, r; 58ff151f4eSDominik Dingel 5992f2ca38SAlexander Graf for (i = 0; i < 0x10000; i++) { 6092f2ca38SAlexander Graf blk_schid.sch_no = i; 610f79b89bSAlexander Yarygin r = stsch_err(blk_schid, schib); 620f79b89bSAlexander Yarygin if ((r == 3) || (r == -EIO)) { 6322d67ab5SCornelia Huck break; 6422d67ab5SCornelia Huck } 650f79b89bSAlexander Yarygin if (!schib->pmcw.dnv) { 660f79b89bSAlexander Yarygin continue; 6792f2ca38SAlexander Graf } 68a1102cebSEugene (jno) Dvurechenski if (!virtio_is_supported(blk_schid)) { 690f79b89bSAlexander Yarygin continue; 700f79b89bSAlexander Yarygin } 7199b72e0fSFarhan Ali /* Skip net devices since no IPLB is created and therefore no 7299b72e0fSFarhan Ali * no network bootloader has been loaded 7399b72e0fSFarhan Ali */ 7499b72e0fSFarhan Ali if (virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) { 7599b72e0fSFarhan Ali continue; 7699b72e0fSFarhan Ali } 770f79b89bSAlexander Yarygin if ((dev_no < 0) || (schib->pmcw.dev == dev_no)) { 780f79b89bSAlexander Yarygin return true; 790f79b89bSAlexander Yarygin } 800f79b89bSAlexander Yarygin } 810f79b89bSAlexander Yarygin 820f79b89bSAlexander Yarygin return false; 830f79b89bSAlexander Yarygin } 840f79b89bSAlexander Yarygin 859eaa654aSCollin L. Walling static void menu_setup(void) 869eaa654aSCollin L. Walling { 87a0e11b61SCollin Walling if (memcmp(loadparm_str, LOADPARM_PROMPT, LOADPARM_LEN) == 0) { 889eaa654aSCollin L. Walling menu_set_parms(QIPL_FLAG_BM_OPTS_CMD, 0); 899eaa654aSCollin L. Walling return; 909eaa654aSCollin L. Walling } 919eaa654aSCollin L. Walling 929eaa654aSCollin L. Walling /* If loadparm was set to any other value, then do not enable menu */ 93a0e11b61SCollin Walling if (memcmp(loadparm_str, LOADPARM_EMPTY, LOADPARM_LEN) != 0) { 949eaa654aSCollin L. Walling return; 959eaa654aSCollin L. Walling } 969eaa654aSCollin L. Walling 979eaa654aSCollin L. Walling switch (iplb.pbt) { 989eaa654aSCollin L. Walling case S390_IPL_TYPE_CCW: 99ffb4a1c8SCollin L. Walling case S390_IPL_TYPE_QEMU_SCSI: 10053b310ceSCollin L. Walling menu_set_parms(qipl.qipl_flags & BOOT_MENU_FLAG_MASK, 1019eaa654aSCollin L. Walling qipl.boot_menu_timeout); 1029eaa654aSCollin L. Walling return; 1039eaa654aSCollin L. Walling } 1049eaa654aSCollin L. Walling } 1059eaa654aSCollin L. Walling 10687f910c1SJason J. Herne /* 10787f910c1SJason J. Herne * Initialize the channel I/O subsystem so we can talk to our ipl/boot device. 10887f910c1SJason J. Herne */ 10987f910c1SJason J. Herne static void css_setup(void) 11087f910c1SJason J. Herne { 11187f910c1SJason J. Herne /* 11287f910c1SJason J. Herne * Unconditionally enable mss support. In every sane configuration this 11387f910c1SJason J. Herne * will succeed; and even if it doesn't, stsch_err() can handle it. 11487f910c1SJason J. Herne */ 11587f910c1SJason J. Herne enable_mss_facility(); 11687f910c1SJason J. Herne } 11787f910c1SJason J. Herne 118a5f6e097SJason J. Herne /* 119a5f6e097SJason J. Herne * Collect various pieces of information from the hypervisor/hardware that 120a5f6e097SJason J. Herne * we'll use to determine exactly how we'll boot. 121a5f6e097SJason J. Herne */ 122a5f6e097SJason J. Herne static void boot_setup(void) 123a5f6e097SJason J. Herne { 124a5f6e097SJason J. Herne char lpmsg[] = "LOADPARM=[________]\n"; 125a5f6e097SJason J. Herne 126a5f6e097SJason J. Herne sclp_get_loadparm_ascii(loadparm_str); 127a5f6e097SJason J. Herne memcpy(lpmsg + 10, loadparm_str, 8); 128a5f6e097SJason J. Herne sclp_print(lpmsg); 129a5f6e097SJason J. Herne 130a5f6e097SJason J. Herne have_iplb = store_iplb(&iplb); 131a5f6e097SJason J. Herne } 132a5f6e097SJason J. Herne 133d046c51dSAlexander Yarygin static void virtio_setup(void) 1340f79b89bSAlexander Yarygin { 135b88d7fa5SEugene (jno) Dvurechenski Schib schib; 1360f79b89bSAlexander Yarygin int ssid; 1370f79b89bSAlexander Yarygin bool found = false; 1380f79b89bSAlexander Yarygin uint16_t dev_no; 13999b72e0fSFarhan Ali VDev *vdev = virtio_get_device(); 140118ee80fSCollin L. Walling QemuIplParameters *early_qipl = (QemuIplParameters *)QIPL_ADDRESS; 1410f79b89bSAlexander Yarygin 142118ee80fSCollin L. Walling memcpy(&qipl, early_qipl, sizeof(QemuIplParameters)); 143118ee80fSCollin L. Walling 144a5f6e097SJason J. Herne if (have_iplb) { 145d046c51dSAlexander Yarygin switch (iplb.pbt) { 146d046c51dSAlexander Yarygin case S390_IPL_TYPE_CCW: 147d046c51dSAlexander Yarygin dev_no = iplb.ccw.devno; 1480f79b89bSAlexander Yarygin debug_print_int("device no. ", dev_no); 149d046c51dSAlexander Yarygin blk_schid.ssid = iplb.ccw.ssid & 0x3; 1500f79b89bSAlexander Yarygin debug_print_int("ssid ", blk_schid.ssid); 1510f79b89bSAlexander Yarygin found = find_dev(&schib, dev_no); 152d046c51dSAlexander Yarygin break; 153b39b7718SEugene (jno) Dvurechenski case S390_IPL_TYPE_QEMU_SCSI: 154b39b7718SEugene (jno) Dvurechenski vdev->scsi_device_selected = true; 155b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.channel = iplb.scsi.channel; 156b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.target = iplb.scsi.target; 157b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.lun = iplb.scsi.lun; 158b39b7718SEugene (jno) Dvurechenski blk_schid.ssid = iplb.scsi.ssid & 0x3; 159b39b7718SEugene (jno) Dvurechenski found = find_dev(&schib, iplb.scsi.devno); 160b39b7718SEugene (jno) Dvurechenski break; 161d046c51dSAlexander Yarygin default: 162d046c51dSAlexander Yarygin panic("List-directed IPL not supported yet!\n"); 163d046c51dSAlexander Yarygin } 1649eaa654aSCollin L. Walling menu_setup(); 1650f79b89bSAlexander Yarygin } else { 1660f79b89bSAlexander Yarygin for (ssid = 0; ssid < 0x3; ssid++) { 1670f79b89bSAlexander Yarygin blk_schid.ssid = ssid; 1680f79b89bSAlexander Yarygin found = find_dev(&schib, -1); 1690f79b89bSAlexander Yarygin if (found) { 1700f79b89bSAlexander Yarygin break; 17192f2ca38SAlexander Graf } 17292f2ca38SAlexander Graf } 173ff151f4eSDominik Dingel } 17492f2ca38SAlexander Graf 17580ba3e24SEugene (jno) Dvurechenski IPL_assert(found, "No virtio device found"); 17692f2ca38SAlexander Graf 17799b72e0fSFarhan Ali if (virtio_get_device_type() == VIRTIO_ID_NET) { 17899b72e0fSFarhan Ali sclp_print("Network boot device detected\n"); 179118ee80fSCollin L. Walling vdev->netboot_start_addr = qipl.netboot_start_addr; 18099b72e0fSFarhan Ali } else { 181867e039aSThomas Huth virtio_blk_setup_device(blk_schid); 18260612d5cSEugene (jno) Dvurechenski 18380ba3e24SEugene (jno) Dvurechenski IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected"); 18492f2ca38SAlexander Graf } 18599b72e0fSFarhan Ali } 18692f2ca38SAlexander Graf 18792f2ca38SAlexander Graf int main(void) 18892f2ca38SAlexander Graf { 18992f2ca38SAlexander Graf sclp_setup(); 19087f910c1SJason J. Herne css_setup(); 191a5f6e097SJason J. Herne boot_setup(); 192d046c51dSAlexander Yarygin virtio_setup(); 193ff151f4eSDominik Dingel 19460612d5cSEugene (jno) Dvurechenski zipl_load(); /* no return */ 19560612d5cSEugene (jno) Dvurechenski 196c9262e8aSEugene (jno) Dvurechenski panic("Failed to load OS from hard disk\n"); 19760612d5cSEugene (jno) Dvurechenski return 0; /* make compiler happy */ 19892f2ca38SAlexander Graf } 199