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" 12c95df3d1SJason J. Herne #include "s390-arch.h" 1392f2ca38SAlexander Graf #include "s390-ccw.h" 14120d0410SJason J. Herne #include "cio.h" 1560612d5cSEugene (jno) Dvurechenski #include "virtio.h" 16efa47d36SJason J. Herne #include "dasd-ipl.h" 1792f2ca38SAlexander Graf 1892f2ca38SAlexander Graf char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); 19b88d7fa5SEugene (jno) Dvurechenski static SubChannelId blk_schid = { .one = 1 }; 20a0e11b61SCollin Walling static char loadparm_str[LOADPARM_LEN + 1] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 }; 21118ee80fSCollin L. Walling QemuIplParameters qipl; 22a5f6e097SJason J. Herne IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE))); 23a5f6e097SJason J. Herne static bool have_iplb; 24*2880469cSJason J. Herne static uint16_t cutype; 25c95df3d1SJason J. Herne LowCore const *lowcore; /* Yes, this *is* a pointer to address 0 */ 26f2879a5cSChristian Borntraeger 279eaa654aSCollin L. Walling #define LOADPARM_PROMPT "PROMPT " 28074afe60SCollin Walling #define LOADPARM_EMPTY " " 2953b310ceSCollin L. Walling #define BOOT_MENU_FLAG_MASK (QIPL_FLAG_BM_OPTS_CMD | QIPL_FLAG_BM_OPTS_ZIPL) 309eaa654aSCollin L. Walling 31f2879a5cSChristian Borntraeger /* 32a5f6e097SJason J. Herne * Principles of Operations (SA22-7832-09) chapter 17 requires that 33f2879a5cSChristian Borntraeger * a subsystem-identification is at 184-187 and bytes 188-191 are zero 34f2879a5cSChristian Borntraeger * after list-directed-IPL and ccw-IPL. 35f2879a5cSChristian Borntraeger */ 36f2879a5cSChristian Borntraeger void write_subsystem_identification(void) 37f2879a5cSChristian Borntraeger { 38b88d7fa5SEugene (jno) Dvurechenski SubChannelId *schid = (SubChannelId *) 184; 39f2879a5cSChristian Borntraeger uint32_t *zeroes = (uint32_t *) 188; 40f2879a5cSChristian Borntraeger 41f2879a5cSChristian Borntraeger *schid = blk_schid; 42f2879a5cSChristian Borntraeger *zeroes = 0; 43f2879a5cSChristian Borntraeger } 44f2879a5cSChristian Borntraeger 45c9262e8aSEugene (jno) Dvurechenski void panic(const char *string) 4692f2ca38SAlexander Graf { 4792f2ca38SAlexander Graf sclp_print(string); 487f61cbc1SChristian Borntraeger disabled_wait(); 4992f2ca38SAlexander Graf while (1) { } 5092f2ca38SAlexander Graf } 5192f2ca38SAlexander Graf 5295fa1af8SFarhan Ali unsigned int get_loadparm_index(void) 5395fa1af8SFarhan Ali { 54074afe60SCollin Walling return atoui(loadparm_str); 5595fa1af8SFarhan Ali } 5695fa1af8SFarhan Ali 57930072d2SJason J. Herne /* 58930072d2SJason J. Herne * Find the subchannel connected to the given device (dev_no) and fill in the 59930072d2SJason J. Herne * subchannel information block (schib) with the connected subchannel's info. 60930072d2SJason J. Herne * NOTE: The global variable blk_schid is updated to contain the subchannel 61930072d2SJason J. Herne * information. 62*2880469cSJason J. Herne * 63*2880469cSJason J. Herne * If the caller gives dev_no=-1 then the user did not specify a boot device. 64*2880469cSJason J. Herne * In this case we'll just use the first potentially bootable device we find. 65930072d2SJason J. Herne */ 667b361db3SJason J. Herne static bool find_subch(int dev_no) 6792f2ca38SAlexander Graf { 687b361db3SJason J. Herne Schib schib; 690f79b89bSAlexander Yarygin int i, r; 70*2880469cSJason J. Herne bool is_virtio; 71ff151f4eSDominik Dingel 7292f2ca38SAlexander Graf for (i = 0; i < 0x10000; i++) { 7392f2ca38SAlexander Graf blk_schid.sch_no = i; 747b361db3SJason J. Herne r = stsch_err(blk_schid, &schib); 750f79b89bSAlexander Yarygin if ((r == 3) || (r == -EIO)) { 7622d67ab5SCornelia Huck break; 7722d67ab5SCornelia Huck } 787b361db3SJason J. Herne if (!schib.pmcw.dnv) { 790f79b89bSAlexander Yarygin continue; 8092f2ca38SAlexander Graf } 81930072d2SJason J. Herne 823668cb7cSJason J. Herne enable_subchannel(blk_schid); 83*2880469cSJason J. Herne cutype = cu_type(blk_schid); 84*2880469cSJason J. Herne 85*2880469cSJason J. Herne /* 86*2880469cSJason J. Herne * Note: we always have to run virtio_is_supported() here to make 87*2880469cSJason J. Herne * sure that the vdev.senseid data gets pre-initialized correctly 88*2880469cSJason J. Herne */ 89*2880469cSJason J. Herne is_virtio = virtio_is_supported(blk_schid); 90*2880469cSJason J. Herne 91*2880469cSJason J. Herne /* No specific devno given, just return 1st possibly bootable device */ 92*2880469cSJason J. Herne if (dev_no < 0) { 93*2880469cSJason J. Herne switch (cutype) { 94*2880469cSJason J. Herne case CU_TYPE_VIRTIO: 95*2880469cSJason J. Herne if (is_virtio) { 96*2880469cSJason J. Herne /* 97*2880469cSJason J. Herne * Skip net devices since no IPLB is created and therefore 98*2880469cSJason J. Herne * no network bootloader has been loaded 99*2880469cSJason J. Herne */ 100*2880469cSJason J. Herne if (virtio_get_device_type() != VIRTIO_ID_NET) { 101*2880469cSJason J. Herne return true; 102*2880469cSJason J. Herne } 103*2880469cSJason J. Herne } 104*2880469cSJason J. Herne continue; 105*2880469cSJason J. Herne case CU_TYPE_DASD_3990: 106*2880469cSJason J. Herne case CU_TYPE_DASD_2107: 107*2880469cSJason J. Herne return true; 108*2880469cSJason J. Herne default: 10999b72e0fSFarhan Ali continue; 11099b72e0fSFarhan Ali } 111*2880469cSJason J. Herne } 112930072d2SJason J. Herne 113*2880469cSJason J. Herne /* Caller asked for a specific devno */ 114*2880469cSJason J. Herne if (schib.pmcw.dev == dev_no) { 1150f79b89bSAlexander Yarygin return true; 1160f79b89bSAlexander Yarygin } 1170f79b89bSAlexander Yarygin } 1180f79b89bSAlexander Yarygin 1190f79b89bSAlexander Yarygin return false; 1200f79b89bSAlexander Yarygin } 1210f79b89bSAlexander Yarygin 1229eaa654aSCollin L. Walling static void menu_setup(void) 1239eaa654aSCollin L. Walling { 124a0e11b61SCollin Walling if (memcmp(loadparm_str, LOADPARM_PROMPT, LOADPARM_LEN) == 0) { 1259eaa654aSCollin L. Walling menu_set_parms(QIPL_FLAG_BM_OPTS_CMD, 0); 1269eaa654aSCollin L. Walling return; 1279eaa654aSCollin L. Walling } 1289eaa654aSCollin L. Walling 1299eaa654aSCollin L. Walling /* If loadparm was set to any other value, then do not enable menu */ 130a0e11b61SCollin Walling if (memcmp(loadparm_str, LOADPARM_EMPTY, LOADPARM_LEN) != 0) { 1319eaa654aSCollin L. Walling return; 1329eaa654aSCollin L. Walling } 1339eaa654aSCollin L. Walling 1349eaa654aSCollin L. Walling switch (iplb.pbt) { 1359eaa654aSCollin L. Walling case S390_IPL_TYPE_CCW: 136ffb4a1c8SCollin L. Walling case S390_IPL_TYPE_QEMU_SCSI: 13753b310ceSCollin L. Walling menu_set_parms(qipl.qipl_flags & BOOT_MENU_FLAG_MASK, 1389eaa654aSCollin L. Walling qipl.boot_menu_timeout); 1399eaa654aSCollin L. Walling return; 1409eaa654aSCollin L. Walling } 1419eaa654aSCollin L. Walling } 1429eaa654aSCollin L. Walling 14387f910c1SJason J. Herne /* 14487f910c1SJason J. Herne * Initialize the channel I/O subsystem so we can talk to our ipl/boot device. 14587f910c1SJason J. Herne */ 14687f910c1SJason J. Herne static void css_setup(void) 14787f910c1SJason J. Herne { 14887f910c1SJason J. Herne /* 14987f910c1SJason J. Herne * Unconditionally enable mss support. In every sane configuration this 15087f910c1SJason J. Herne * will succeed; and even if it doesn't, stsch_err() can handle it. 15187f910c1SJason J. Herne */ 15287f910c1SJason J. Herne enable_mss_facility(); 15387f910c1SJason J. Herne } 15487f910c1SJason J. Herne 155a5f6e097SJason J. Herne /* 156a5f6e097SJason J. Herne * Collect various pieces of information from the hypervisor/hardware that 157a5f6e097SJason J. Herne * we'll use to determine exactly how we'll boot. 158a5f6e097SJason J. Herne */ 159a5f6e097SJason J. Herne static void boot_setup(void) 160a5f6e097SJason J. Herne { 161a5f6e097SJason J. Herne char lpmsg[] = "LOADPARM=[________]\n"; 162a5f6e097SJason J. Herne 163a5f6e097SJason J. Herne sclp_get_loadparm_ascii(loadparm_str); 164a5f6e097SJason J. Herne memcpy(lpmsg + 10, loadparm_str, 8); 165a5f6e097SJason J. Herne sclp_print(lpmsg); 166a5f6e097SJason J. Herne 167a5f6e097SJason J. Herne have_iplb = store_iplb(&iplb); 168a5f6e097SJason J. Herne } 169a5f6e097SJason J. Herne 1707b361db3SJason J. Herne static void find_boot_device(void) 1710f79b89bSAlexander Yarygin { 17299b72e0fSFarhan Ali VDev *vdev = virtio_get_device(); 1737b361db3SJason J. Herne int ssid; 1747b361db3SJason J. Herne bool found; 1750f79b89bSAlexander Yarygin 1767b361db3SJason J. Herne if (!have_iplb) { 1777b361db3SJason J. Herne for (ssid = 0; ssid < 0x3; ssid++) { 1787b361db3SJason J. Herne blk_schid.ssid = ssid; 1797b361db3SJason J. Herne found = find_subch(-1); 1807b361db3SJason J. Herne if (found) { 1817b361db3SJason J. Herne return; 1827b361db3SJason J. Herne } 1837b361db3SJason J. Herne } 1847b361db3SJason J. Herne panic("Could not find a suitable boot device (none specified)\n"); 1857b361db3SJason J. Herne } 186118ee80fSCollin L. Walling 187d046c51dSAlexander Yarygin switch (iplb.pbt) { 188d046c51dSAlexander Yarygin case S390_IPL_TYPE_CCW: 1897b361db3SJason J. Herne debug_print_int("device no. ", iplb.ccw.devno); 190d046c51dSAlexander Yarygin blk_schid.ssid = iplb.ccw.ssid & 0x3; 1910f79b89bSAlexander Yarygin debug_print_int("ssid ", blk_schid.ssid); 1927b361db3SJason J. Herne found = find_subch(iplb.ccw.devno); 193d046c51dSAlexander Yarygin break; 194b39b7718SEugene (jno) Dvurechenski case S390_IPL_TYPE_QEMU_SCSI: 195b39b7718SEugene (jno) Dvurechenski vdev->scsi_device_selected = true; 196b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.channel = iplb.scsi.channel; 197b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.target = iplb.scsi.target; 198b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.lun = iplb.scsi.lun; 199b39b7718SEugene (jno) Dvurechenski blk_schid.ssid = iplb.scsi.ssid & 0x3; 2007b361db3SJason J. Herne found = find_subch(iplb.scsi.devno); 201b39b7718SEugene (jno) Dvurechenski break; 202d046c51dSAlexander Yarygin default: 203d046c51dSAlexander Yarygin panic("List-directed IPL not supported yet!\n"); 204d046c51dSAlexander Yarygin } 2057b361db3SJason J. Herne 2067b361db3SJason J. Herne IPL_assert(found, "Boot device not found\n"); 207ff151f4eSDominik Dingel } 20892f2ca38SAlexander Graf 2097b361db3SJason J. Herne static void virtio_setup(void) 2107b361db3SJason J. Herne { 2117b361db3SJason J. Herne VDev *vdev = virtio_get_device(); 2127b361db3SJason J. Herne QemuIplParameters *early_qipl = (QemuIplParameters *)QIPL_ADDRESS; 2137b361db3SJason J. Herne 2147b361db3SJason J. Herne memcpy(&qipl, early_qipl, sizeof(QemuIplParameters)); 2157b361db3SJason J. Herne 2167b361db3SJason J. Herne if (have_iplb) { 2177b361db3SJason J. Herne menu_setup(); 2187b361db3SJason J. Herne } 21992f2ca38SAlexander Graf 22099b72e0fSFarhan Ali if (virtio_get_device_type() == VIRTIO_ID_NET) { 22199b72e0fSFarhan Ali sclp_print("Network boot device detected\n"); 222118ee80fSCollin L. Walling vdev->netboot_start_addr = qipl.netboot_start_addr; 22399b72e0fSFarhan Ali } else { 224867e039aSThomas Huth virtio_blk_setup_device(blk_schid); 22580ba3e24SEugene (jno) Dvurechenski IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected"); 22692f2ca38SAlexander Graf } 22799b72e0fSFarhan Ali } 22892f2ca38SAlexander Graf 22992f2ca38SAlexander Graf int main(void) 23092f2ca38SAlexander Graf { 23192f2ca38SAlexander Graf sclp_setup(); 23287f910c1SJason J. Herne css_setup(); 233a5f6e097SJason J. Herne boot_setup(); 2347b361db3SJason J. Herne find_boot_device(); 2353668cb7cSJason J. Herne enable_subchannel(blk_schid); 236ff151f4eSDominik Dingel 2373668cb7cSJason J. Herne switch (cutype) { 238efa47d36SJason J. Herne case CU_TYPE_DASD_3990: 239efa47d36SJason J. Herne case CU_TYPE_DASD_2107: 240efa47d36SJason J. Herne dasd_ipl(blk_schid, cutype); /* no return */ 241efa47d36SJason J. Herne break; 2423668cb7cSJason J. Herne case CU_TYPE_VIRTIO: 2437b361db3SJason J. Herne virtio_setup(); 24460612d5cSEugene (jno) Dvurechenski zipl_load(); /* no return */ 2453668cb7cSJason J. Herne break; 2463668cb7cSJason J. Herne default: 2473668cb7cSJason J. Herne print_int("Attempting to boot from unexpected device type", cutype); 2483668cb7cSJason J. Herne panic(""); 2493668cb7cSJason J. Herne } 25060612d5cSEugene (jno) Dvurechenski 251c9262e8aSEugene (jno) Dvurechenski panic("Failed to load OS from hard disk\n"); 25260612d5cSEugene (jno) Dvurechenski return 0; /* make compiler happy */ 25392f2ca38SAlexander Graf } 254