1 /* 2 * bootloader support 3 * 4 * Copyright IBM, Corp. 2012 5 * 6 * Authors: 7 * Christian Borntraeger <borntraeger@de.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or (at your 10 * option) any later version. See the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "qemu/osdep.h" 15 #include "qapi/error.h" 16 #include "sysemu/sysemu.h" 17 #include "cpu.h" 18 #include "elf.h" 19 #include "hw/loader.h" 20 #include "hw/s390x/virtio-ccw.h" 21 #include "hw/s390x/css.h" 22 #include "ipl.h" 23 #include "qemu/error-report.h" 24 25 #define KERN_IMAGE_START 0x010000UL 26 #define KERN_PARM_AREA 0x010480UL 27 #define INITRD_START 0x800000UL 28 #define INITRD_PARM_START 0x010408UL 29 #define INITRD_PARM_SIZE 0x010410UL 30 #define PARMFILE_START 0x001000UL 31 #define ZIPL_IMAGE_START 0x009000UL 32 #define IPL_PSW_MASK (PSW_MASK_32 | PSW_MASK_64) 33 34 static bool iplb_extended_needed(void *opaque) 35 { 36 S390IPLState *ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL)); 37 38 return ipl->iplbext_migration; 39 } 40 41 static const VMStateDescription vmstate_iplb_extended = { 42 .name = "ipl/iplb_extended", 43 .version_id = 0, 44 .minimum_version_id = 0, 45 .needed = iplb_extended_needed, 46 .fields = (VMStateField[]) { 47 VMSTATE_UINT8_ARRAY(reserved_ext, IplParameterBlock, 4096 - 200), 48 VMSTATE_END_OF_LIST() 49 } 50 }; 51 52 static const VMStateDescription vmstate_iplb = { 53 .name = "ipl/iplb", 54 .version_id = 0, 55 .minimum_version_id = 0, 56 .fields = (VMStateField[]) { 57 VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110), 58 VMSTATE_UINT16(devno, IplParameterBlock), 59 VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88), 60 VMSTATE_END_OF_LIST() 61 }, 62 .subsections = (const VMStateDescription*[]) { 63 &vmstate_iplb_extended, 64 NULL 65 } 66 }; 67 68 static const VMStateDescription vmstate_ipl = { 69 .name = "ipl", 70 .version_id = 0, 71 .minimum_version_id = 0, 72 .fields = (VMStateField[]) { 73 VMSTATE_UINT64(compat_start_addr, S390IPLState), 74 VMSTATE_UINT64(compat_bios_start_addr, S390IPLState), 75 VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock), 76 VMSTATE_BOOL(iplb_valid, S390IPLState), 77 VMSTATE_UINT8(cssid, S390IPLState), 78 VMSTATE_UINT8(ssid, S390IPLState), 79 VMSTATE_UINT16(devno, S390IPLState), 80 VMSTATE_END_OF_LIST() 81 } 82 }; 83 84 static S390IPLState *get_ipl_device(void) 85 { 86 return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL)); 87 } 88 89 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr) 90 { 91 uint64_t dstaddr = *(uint64_t *) opaque; 92 /* 93 * Assuming that our s390-ccw.img was linked for starting at address 0, 94 * we can simply add the destination address for the final location 95 */ 96 return srcaddr + dstaddr; 97 } 98 99 static void s390_ipl_realize(DeviceState *dev, Error **errp) 100 { 101 S390IPLState *ipl = S390_IPL(dev); 102 uint64_t pentry = KERN_IMAGE_START; 103 int kernel_size; 104 Error *err = NULL; 105 106 int bios_size; 107 char *bios_filename; 108 109 /* 110 * Always load the bios if it was enforced, 111 * even if an external kernel has been defined. 112 */ 113 if (!ipl->kernel || ipl->enforce_bios) { 114 uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL; 115 116 if (bios_name == NULL) { 117 bios_name = ipl->firmware; 118 } 119 120 bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 121 if (bios_filename == NULL) { 122 error_setg(&err, "could not find stage1 bootloader"); 123 goto error; 124 } 125 126 bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase, 127 &ipl->bios_start_addr, NULL, NULL, 1, 128 EM_S390, 0, 0); 129 if (bios_size > 0) { 130 /* Adjust ELF start address to final location */ 131 ipl->bios_start_addr += fwbase; 132 } else { 133 /* Try to load non-ELF file */ 134 bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START, 135 4096); 136 ipl->bios_start_addr = ZIPL_IMAGE_START; 137 } 138 g_free(bios_filename); 139 140 if (bios_size == -1) { 141 error_setg(&err, "could not load bootloader '%s'", bios_name); 142 goto error; 143 } 144 145 /* default boot target is the bios */ 146 ipl->start_addr = ipl->bios_start_addr; 147 } 148 149 if (ipl->kernel) { 150 kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL, 151 NULL, 1, EM_S390, 0, 0); 152 if (kernel_size < 0) { 153 kernel_size = load_image_targphys(ipl->kernel, 0, ram_size); 154 } 155 if (kernel_size < 0) { 156 error_setg(&err, "could not load kernel '%s'", ipl->kernel); 157 goto error; 158 } 159 /* 160 * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the 161 * kernel parameters here as well. Note: For old kernels (up to 3.2) 162 * we can not rely on the ELF entry point - it was 0x800 (the SALIPL 163 * loader) and it won't work. For this case we force it to 0x10000, too. 164 */ 165 if (pentry == KERN_IMAGE_START || pentry == 0x800) { 166 ipl->start_addr = KERN_IMAGE_START; 167 /* Overwrite parameters in the kernel image, which are "rom" */ 168 strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline); 169 } else { 170 ipl->start_addr = pentry; 171 } 172 173 if (ipl->initrd) { 174 ram_addr_t initrd_offset; 175 int initrd_size; 176 177 initrd_offset = INITRD_START; 178 while (kernel_size + 0x100000 > initrd_offset) { 179 initrd_offset += 0x100000; 180 } 181 initrd_size = load_image_targphys(ipl->initrd, initrd_offset, 182 ram_size - initrd_offset); 183 if (initrd_size == -1) { 184 error_setg(&err, "could not load initrd '%s'", ipl->initrd); 185 goto error; 186 } 187 188 /* 189 * we have to overwrite values in the kernel image, 190 * which are "rom" 191 */ 192 stq_p(rom_ptr(INITRD_PARM_START), initrd_offset); 193 stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size); 194 } 195 } 196 /* 197 * Don't ever use the migrated values, they could come from a different 198 * BIOS and therefore don't work. But still migrate the values, so 199 * QEMUs relying on it don't break. 200 */ 201 ipl->compat_start_addr = ipl->start_addr; 202 ipl->compat_bios_start_addr = ipl->bios_start_addr; 203 qemu_register_reset(qdev_reset_all_fn, dev); 204 error: 205 error_propagate(errp, err); 206 } 207 208 static Property s390_ipl_properties[] = { 209 DEFINE_PROP_STRING("kernel", S390IPLState, kernel), 210 DEFINE_PROP_STRING("initrd", S390IPLState, initrd), 211 DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline), 212 DEFINE_PROP_STRING("firmware", S390IPLState, firmware), 213 DEFINE_PROP_STRING("netboot_fw", S390IPLState, netboot_fw), 214 DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false), 215 DEFINE_PROP_BOOL("iplbext_migration", S390IPLState, iplbext_migration, 216 true), 217 DEFINE_PROP_END_OF_LIST(), 218 }; 219 220 static bool s390_gen_initial_iplb(S390IPLState *ipl) 221 { 222 DeviceState *dev_st; 223 224 dev_st = get_boot_device(0); 225 if (dev_st) { 226 VirtioCcwDevice *virtio_ccw_dev = (VirtioCcwDevice *) 227 object_dynamic_cast(OBJECT(qdev_get_parent_bus(dev_st)->parent), 228 TYPE_VIRTIO_CCW_DEVICE); 229 SCSIDevice *sd = (SCSIDevice *) object_dynamic_cast(OBJECT(dev_st), 230 TYPE_SCSI_DEVICE); 231 VirtIONet *vn = (VirtIONet *) object_dynamic_cast(OBJECT(dev_st), 232 TYPE_VIRTIO_NET); 233 234 if (vn) { 235 ipl->netboot = true; 236 } 237 if (virtio_ccw_dev) { 238 CcwDevice *ccw_dev = CCW_DEVICE(virtio_ccw_dev); 239 240 ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_CCW_LEN); 241 ipl->iplb.blk0_len = 242 cpu_to_be32(S390_IPLB_MIN_CCW_LEN - S390_IPLB_HEADER_LEN); 243 ipl->iplb.pbt = S390_IPL_TYPE_CCW; 244 ipl->iplb.ccw.devno = cpu_to_be16(ccw_dev->sch->devno); 245 ipl->iplb.ccw.ssid = ccw_dev->sch->ssid & 3; 246 return true; 247 } else if (sd) { 248 SCSIBus *bus = scsi_bus_from_device(sd); 249 VirtIOSCSI *vdev = container_of(bus, VirtIOSCSI, bus); 250 VirtIOSCSICcw *scsi_ccw = container_of(vdev, VirtIOSCSICcw, vdev); 251 CcwDevice *ccw_dev = CCW_DEVICE(scsi_ccw); 252 253 ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_QEMU_SCSI_LEN); 254 ipl->iplb.blk0_len = 255 cpu_to_be32(S390_IPLB_MIN_QEMU_SCSI_LEN - S390_IPLB_HEADER_LEN); 256 ipl->iplb.pbt = S390_IPL_TYPE_QEMU_SCSI; 257 ipl->iplb.scsi.lun = cpu_to_be32(sd->lun); 258 ipl->iplb.scsi.target = cpu_to_be16(sd->id); 259 ipl->iplb.scsi.channel = cpu_to_be16(sd->channel); 260 ipl->iplb.scsi.devno = cpu_to_be16(ccw_dev->sch->devno); 261 ipl->iplb.scsi.ssid = ccw_dev->sch->ssid & 3; 262 return true; 263 } 264 } 265 266 return false; 267 } 268 269 static int load_netboot_image(Error **errp) 270 { 271 S390IPLState *ipl = get_ipl_device(); 272 char *netboot_filename; 273 MemoryRegion *sysmem = get_system_memory(); 274 MemoryRegion *mr = NULL; 275 void *ram_ptr = NULL; 276 int img_size = -1; 277 278 mr = memory_region_find(sysmem, 0, 1).mr; 279 if (!mr) { 280 error_setg(errp, "Failed to find memory region at address 0"); 281 return -1; 282 } 283 284 ram_ptr = memory_region_get_ram_ptr(mr); 285 if (!ram_ptr) { 286 error_setg(errp, "No RAM found"); 287 goto unref_mr; 288 } 289 290 netboot_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, ipl->netboot_fw); 291 if (netboot_filename == NULL) { 292 error_setg(errp, "Could not find network bootloader"); 293 goto unref_mr; 294 } 295 296 img_size = load_elf_ram(netboot_filename, NULL, NULL, &ipl->start_addr, 297 NULL, NULL, 1, EM_S390, 0, 0, NULL, false); 298 299 if (img_size < 0) { 300 img_size = load_image_size(netboot_filename, ram_ptr, ram_size); 301 ipl->start_addr = KERN_IMAGE_START; 302 } 303 304 if (img_size < 0) { 305 error_setg(errp, "Failed to load network bootloader"); 306 } 307 308 g_free(netboot_filename); 309 310 unref_mr: 311 memory_region_unref(mr); 312 return img_size; 313 } 314 315 static bool is_virtio_net_device(IplParameterBlock *iplb) 316 { 317 uint8_t cssid; 318 uint8_t ssid; 319 uint16_t devno; 320 uint16_t schid; 321 SubchDev *sch = NULL; 322 323 if (iplb->pbt != S390_IPL_TYPE_CCW) { 324 return false; 325 } 326 327 devno = be16_to_cpu(iplb->ccw.devno); 328 ssid = iplb->ccw.ssid & 3; 329 330 for (schid = 0; schid < MAX_SCHID; schid++) { 331 for (cssid = 0; cssid < MAX_CSSID; cssid++) { 332 sch = css_find_subch(1, cssid, ssid, schid); 333 334 if (sch && sch->devno == devno) { 335 return sch->id.cu_model == VIRTIO_ID_NET; 336 } 337 } 338 } 339 return false; 340 } 341 342 void s390_ipl_update_diag308(IplParameterBlock *iplb) 343 { 344 S390IPLState *ipl = get_ipl_device(); 345 346 ipl->iplb = *iplb; 347 ipl->iplb_valid = true; 348 ipl->netboot = is_virtio_net_device(iplb); 349 } 350 351 IplParameterBlock *s390_ipl_get_iplb(void) 352 { 353 S390IPLState *ipl = get_ipl_device(); 354 355 if (!ipl->iplb_valid) { 356 return NULL; 357 } 358 return &ipl->iplb; 359 } 360 361 void s390_reipl_request(void) 362 { 363 S390IPLState *ipl = get_ipl_device(); 364 365 ipl->reipl_requested = true; 366 qemu_system_reset_request(); 367 } 368 369 void s390_ipl_prepare_cpu(S390CPU *cpu) 370 { 371 S390IPLState *ipl = get_ipl_device(); 372 Error *err = NULL; 373 374 cpu->env.psw.addr = ipl->start_addr; 375 cpu->env.psw.mask = IPL_PSW_MASK; 376 377 if (!ipl->kernel || ipl->iplb_valid) { 378 cpu->env.psw.addr = ipl->bios_start_addr; 379 if (!ipl->iplb_valid) { 380 ipl->iplb_valid = s390_gen_initial_iplb(ipl); 381 } 382 } 383 if (ipl->netboot) { 384 if (load_netboot_image(&err) < 0) { 385 error_report_err(err); 386 vm_stop(RUN_STATE_INTERNAL_ERROR); 387 } 388 ipl->iplb.ccw.netboot_start_addr = ipl->start_addr; 389 } 390 } 391 392 static void s390_ipl_reset(DeviceState *dev) 393 { 394 S390IPLState *ipl = S390_IPL(dev); 395 396 if (!ipl->reipl_requested) { 397 ipl->iplb_valid = false; 398 memset(&ipl->iplb, 0, sizeof(IplParameterBlock)); 399 } 400 ipl->reipl_requested = false; 401 } 402 403 static void s390_ipl_class_init(ObjectClass *klass, void *data) 404 { 405 DeviceClass *dc = DEVICE_CLASS(klass); 406 407 dc->realize = s390_ipl_realize; 408 dc->props = s390_ipl_properties; 409 dc->reset = s390_ipl_reset; 410 dc->vmsd = &vmstate_ipl; 411 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 412 } 413 414 static const TypeInfo s390_ipl_info = { 415 .class_init = s390_ipl_class_init, 416 .parent = TYPE_DEVICE, 417 .name = TYPE_S390_IPL, 418 .instance_size = sizeof(S390IPLState), 419 }; 420 421 static void s390_ipl_register_types(void) 422 { 423 type_register_static(&s390_ipl_info); 424 } 425 426 type_init(s390_ipl_register_types) 427