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" 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; 23c95df3d1SJason 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 55930072d2SJason J. Herne /* 56930072d2SJason J. Herne * Find the subchannel connected to the given device (dev_no) and fill in the 57930072d2SJason J. Herne * subchannel information block (schib) with the connected subchannel's info. 58930072d2SJason J. Herne * NOTE: The global variable blk_schid is updated to contain the subchannel 59930072d2SJason J. Herne * information. 60930072d2SJason J. Herne */ 617b361db3SJason J. Herne static bool find_subch(int dev_no) 6292f2ca38SAlexander Graf { 637b361db3SJason J. Herne Schib schib; 640f79b89bSAlexander Yarygin int i, r; 65ff151f4eSDominik Dingel 6692f2ca38SAlexander Graf for (i = 0; i < 0x10000; i++) { 6792f2ca38SAlexander Graf blk_schid.sch_no = i; 687b361db3SJason J. Herne r = stsch_err(blk_schid, &schib); 690f79b89bSAlexander Yarygin if ((r == 3) || (r == -EIO)) { 7022d67ab5SCornelia Huck break; 7122d67ab5SCornelia Huck } 727b361db3SJason J. Herne if (!schib.pmcw.dnv) { 730f79b89bSAlexander Yarygin continue; 7492f2ca38SAlexander Graf } 75930072d2SJason J. Herne 7699b72e0fSFarhan Ali /* Skip net devices since no IPLB is created and therefore no 77930072d2SJason J. Herne * network bootloader has been loaded 7899b72e0fSFarhan Ali */ 79*3668cb7cSJason J. Herne enable_subchannel(blk_schid); 80930072d2SJason J. Herne if (virtio_is_supported(blk_schid) && 81930072d2SJason J. Herne virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) { 8299b72e0fSFarhan Ali continue; 8399b72e0fSFarhan Ali } 84930072d2SJason J. Herne 857b361db3SJason J. Herne if ((dev_no < 0) || (schib.pmcw.dev == dev_no)) { 860f79b89bSAlexander Yarygin return true; 870f79b89bSAlexander Yarygin } 880f79b89bSAlexander Yarygin } 890f79b89bSAlexander Yarygin 900f79b89bSAlexander Yarygin return false; 910f79b89bSAlexander Yarygin } 920f79b89bSAlexander Yarygin 939eaa654aSCollin L. Walling static void menu_setup(void) 949eaa654aSCollin L. Walling { 95a0e11b61SCollin Walling if (memcmp(loadparm_str, LOADPARM_PROMPT, LOADPARM_LEN) == 0) { 969eaa654aSCollin L. Walling menu_set_parms(QIPL_FLAG_BM_OPTS_CMD, 0); 979eaa654aSCollin L. Walling return; 989eaa654aSCollin L. Walling } 999eaa654aSCollin L. Walling 1009eaa654aSCollin L. Walling /* If loadparm was set to any other value, then do not enable menu */ 101a0e11b61SCollin Walling if (memcmp(loadparm_str, LOADPARM_EMPTY, LOADPARM_LEN) != 0) { 1029eaa654aSCollin L. Walling return; 1039eaa654aSCollin L. Walling } 1049eaa654aSCollin L. Walling 1059eaa654aSCollin L. Walling switch (iplb.pbt) { 1069eaa654aSCollin L. Walling case S390_IPL_TYPE_CCW: 107ffb4a1c8SCollin L. Walling case S390_IPL_TYPE_QEMU_SCSI: 10853b310ceSCollin L. Walling menu_set_parms(qipl.qipl_flags & BOOT_MENU_FLAG_MASK, 1099eaa654aSCollin L. Walling qipl.boot_menu_timeout); 1109eaa654aSCollin L. Walling return; 1119eaa654aSCollin L. Walling } 1129eaa654aSCollin L. Walling } 1139eaa654aSCollin L. Walling 11487f910c1SJason J. Herne /* 11587f910c1SJason J. Herne * Initialize the channel I/O subsystem so we can talk to our ipl/boot device. 11687f910c1SJason J. Herne */ 11787f910c1SJason J. Herne static void css_setup(void) 11887f910c1SJason J. Herne { 11987f910c1SJason J. Herne /* 12087f910c1SJason J. Herne * Unconditionally enable mss support. In every sane configuration this 12187f910c1SJason J. Herne * will succeed; and even if it doesn't, stsch_err() can handle it. 12287f910c1SJason J. Herne */ 12387f910c1SJason J. Herne enable_mss_facility(); 12487f910c1SJason J. Herne } 12587f910c1SJason J. Herne 126a5f6e097SJason J. Herne /* 127a5f6e097SJason J. Herne * Collect various pieces of information from the hypervisor/hardware that 128a5f6e097SJason J. Herne * we'll use to determine exactly how we'll boot. 129a5f6e097SJason J. Herne */ 130a5f6e097SJason J. Herne static void boot_setup(void) 131a5f6e097SJason J. Herne { 132a5f6e097SJason J. Herne char lpmsg[] = "LOADPARM=[________]\n"; 133a5f6e097SJason J. Herne 134a5f6e097SJason J. Herne sclp_get_loadparm_ascii(loadparm_str); 135a5f6e097SJason J. Herne memcpy(lpmsg + 10, loadparm_str, 8); 136a5f6e097SJason J. Herne sclp_print(lpmsg); 137a5f6e097SJason J. Herne 138a5f6e097SJason J. Herne have_iplb = store_iplb(&iplb); 139a5f6e097SJason J. Herne } 140a5f6e097SJason J. Herne 1417b361db3SJason J. Herne static void find_boot_device(void) 1420f79b89bSAlexander Yarygin { 14399b72e0fSFarhan Ali VDev *vdev = virtio_get_device(); 1447b361db3SJason J. Herne int ssid; 1457b361db3SJason J. Herne bool found; 1460f79b89bSAlexander Yarygin 1477b361db3SJason J. Herne if (!have_iplb) { 1487b361db3SJason J. Herne for (ssid = 0; ssid < 0x3; ssid++) { 1497b361db3SJason J. Herne blk_schid.ssid = ssid; 1507b361db3SJason J. Herne found = find_subch(-1); 1517b361db3SJason J. Herne if (found) { 1527b361db3SJason J. Herne return; 1537b361db3SJason J. Herne } 1547b361db3SJason J. Herne } 1557b361db3SJason J. Herne panic("Could not find a suitable boot device (none specified)\n"); 1567b361db3SJason J. Herne } 157118ee80fSCollin L. Walling 158d046c51dSAlexander Yarygin switch (iplb.pbt) { 159d046c51dSAlexander Yarygin case S390_IPL_TYPE_CCW: 1607b361db3SJason J. Herne debug_print_int("device no. ", iplb.ccw.devno); 161d046c51dSAlexander Yarygin blk_schid.ssid = iplb.ccw.ssid & 0x3; 1620f79b89bSAlexander Yarygin debug_print_int("ssid ", blk_schid.ssid); 1637b361db3SJason J. Herne found = find_subch(iplb.ccw.devno); 164d046c51dSAlexander Yarygin break; 165b39b7718SEugene (jno) Dvurechenski case S390_IPL_TYPE_QEMU_SCSI: 166b39b7718SEugene (jno) Dvurechenski vdev->scsi_device_selected = true; 167b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.channel = iplb.scsi.channel; 168b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.target = iplb.scsi.target; 169b39b7718SEugene (jno) Dvurechenski vdev->selected_scsi_device.lun = iplb.scsi.lun; 170b39b7718SEugene (jno) Dvurechenski blk_schid.ssid = iplb.scsi.ssid & 0x3; 1717b361db3SJason J. Herne found = find_subch(iplb.scsi.devno); 172b39b7718SEugene (jno) Dvurechenski break; 173d046c51dSAlexander Yarygin default: 174d046c51dSAlexander Yarygin panic("List-directed IPL not supported yet!\n"); 175d046c51dSAlexander Yarygin } 1767b361db3SJason J. Herne 1777b361db3SJason J. Herne IPL_assert(found, "Boot device not found\n"); 178ff151f4eSDominik Dingel } 17992f2ca38SAlexander Graf 1807b361db3SJason J. Herne static void virtio_setup(void) 1817b361db3SJason J. Herne { 1827b361db3SJason J. Herne VDev *vdev = virtio_get_device(); 1837b361db3SJason J. Herne QemuIplParameters *early_qipl = (QemuIplParameters *)QIPL_ADDRESS; 1847b361db3SJason J. Herne 1857b361db3SJason J. Herne memcpy(&qipl, early_qipl, sizeof(QemuIplParameters)); 1867b361db3SJason J. Herne 1877b361db3SJason J. Herne if (have_iplb) { 1887b361db3SJason J. Herne menu_setup(); 1897b361db3SJason J. Herne } 19092f2ca38SAlexander Graf 19199b72e0fSFarhan Ali if (virtio_get_device_type() == VIRTIO_ID_NET) { 19299b72e0fSFarhan Ali sclp_print("Network boot device detected\n"); 193118ee80fSCollin L. Walling vdev->netboot_start_addr = qipl.netboot_start_addr; 19499b72e0fSFarhan Ali } else { 195867e039aSThomas Huth virtio_blk_setup_device(blk_schid); 19680ba3e24SEugene (jno) Dvurechenski IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected"); 19792f2ca38SAlexander Graf } 19899b72e0fSFarhan Ali } 19992f2ca38SAlexander Graf 20092f2ca38SAlexander Graf int main(void) 20192f2ca38SAlexander Graf { 202*3668cb7cSJason J. Herne uint16_t cutype; 203*3668cb7cSJason J. Herne 20492f2ca38SAlexander Graf sclp_setup(); 20587f910c1SJason J. Herne css_setup(); 206a5f6e097SJason J. Herne boot_setup(); 2077b361db3SJason J. Herne find_boot_device(); 208*3668cb7cSJason J. Herne enable_subchannel(blk_schid); 209ff151f4eSDominik Dingel 210*3668cb7cSJason J. Herne cutype = cu_type(blk_schid); 211*3668cb7cSJason J. Herne switch (cutype) { 212*3668cb7cSJason J. Herne case CU_TYPE_VIRTIO: 2137b361db3SJason J. Herne virtio_setup(); 21460612d5cSEugene (jno) Dvurechenski zipl_load(); /* no return */ 215*3668cb7cSJason J. Herne break; 216*3668cb7cSJason J. Herne default: 217*3668cb7cSJason J. Herne print_int("Attempting to boot from unexpected device type", cutype); 218*3668cb7cSJason J. Herne panic(""); 219*3668cb7cSJason J. Herne } 22060612d5cSEugene (jno) Dvurechenski 221c9262e8aSEugene (jno) Dvurechenski panic("Failed to load OS from hard disk\n"); 22260612d5cSEugene (jno) Dvurechenski return 0; /* make compiler happy */ 22392f2ca38SAlexander Graf } 224