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 24 #define KERN_IMAGE_START 0x010000UL 25 #define KERN_PARM_AREA 0x010480UL 26 #define INITRD_START 0x800000UL 27 #define INITRD_PARM_START 0x010408UL 28 #define INITRD_PARM_SIZE 0x010410UL 29 #define PARMFILE_START 0x001000UL 30 #define ZIPL_IMAGE_START 0x009000UL 31 #define IPL_PSW_MASK (PSW_MASK_32 | PSW_MASK_64) 32 33 static bool iplb_extended_needed(void *opaque) 34 { 35 S390IPLState *ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL)); 36 37 return ipl->iplbext_migration; 38 } 39 40 static const VMStateDescription vmstate_iplb_extended = { 41 .name = "ipl/iplb_extended", 42 .version_id = 0, 43 .minimum_version_id = 0, 44 .needed = iplb_extended_needed, 45 .fields = (VMStateField[]) { 46 VMSTATE_UINT8_ARRAY(reserved_ext, IplParameterBlock, 4096 - 200), 47 VMSTATE_END_OF_LIST() 48 } 49 }; 50 51 static const VMStateDescription vmstate_iplb = { 52 .name = "ipl/iplb", 53 .version_id = 0, 54 .minimum_version_id = 0, 55 .fields = (VMStateField[]) { 56 VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110), 57 VMSTATE_UINT16(devno, IplParameterBlock), 58 VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88), 59 VMSTATE_END_OF_LIST() 60 }, 61 .subsections = (const VMStateDescription*[]) { 62 &vmstate_iplb_extended, 63 NULL 64 } 65 }; 66 67 static const VMStateDescription vmstate_ipl = { 68 .name = "ipl", 69 .version_id = 0, 70 .minimum_version_id = 0, 71 .fields = (VMStateField[]) { 72 VMSTATE_UINT64(compat_start_addr, S390IPLState), 73 VMSTATE_UINT64(compat_bios_start_addr, S390IPLState), 74 VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock), 75 VMSTATE_BOOL(iplb_valid, S390IPLState), 76 VMSTATE_UINT8(cssid, S390IPLState), 77 VMSTATE_UINT8(ssid, S390IPLState), 78 VMSTATE_UINT16(devno, S390IPLState), 79 VMSTATE_END_OF_LIST() 80 } 81 }; 82 83 static S390IPLState *get_ipl_device(void) 84 { 85 return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL)); 86 } 87 88 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr) 89 { 90 uint64_t dstaddr = *(uint64_t *) opaque; 91 /* 92 * Assuming that our s390-ccw.img was linked for starting at address 0, 93 * we can simply add the destination address for the final location 94 */ 95 return srcaddr + dstaddr; 96 } 97 98 static void s390_ipl_realize(DeviceState *dev, Error **errp) 99 { 100 S390IPLState *ipl = S390_IPL(dev); 101 uint64_t pentry = KERN_IMAGE_START; 102 int kernel_size; 103 Error *err = NULL; 104 105 int bios_size; 106 char *bios_filename; 107 108 /* 109 * Always load the bios if it was enforced, 110 * even if an external kernel has been defined. 111 */ 112 if (!ipl->kernel || ipl->enforce_bios) { 113 uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL; 114 115 if (bios_name == NULL) { 116 bios_name = ipl->firmware; 117 } 118 119 bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 120 if (bios_filename == NULL) { 121 error_setg(&err, "could not find stage1 bootloader"); 122 goto error; 123 } 124 125 bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase, 126 &ipl->bios_start_addr, NULL, NULL, 1, 127 EM_S390, 0, 0); 128 if (bios_size > 0) { 129 /* Adjust ELF start address to final location */ 130 ipl->bios_start_addr += fwbase; 131 } else { 132 /* Try to load non-ELF file */ 133 bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START, 134 4096); 135 ipl->bios_start_addr = ZIPL_IMAGE_START; 136 } 137 g_free(bios_filename); 138 139 if (bios_size == -1) { 140 error_setg(&err, "could not load bootloader '%s'", bios_name); 141 goto error; 142 } 143 144 /* default boot target is the bios */ 145 ipl->start_addr = ipl->bios_start_addr; 146 } 147 148 if (ipl->kernel) { 149 kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL, 150 NULL, 1, EM_S390, 0, 0); 151 if (kernel_size < 0) { 152 kernel_size = load_image_targphys(ipl->kernel, 0, ram_size); 153 } 154 if (kernel_size < 0) { 155 error_setg(&err, "could not load kernel '%s'", ipl->kernel); 156 goto error; 157 } 158 /* 159 * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the 160 * kernel parameters here as well. Note: For old kernels (up to 3.2) 161 * we can not rely on the ELF entry point - it was 0x800 (the SALIPL 162 * loader) and it won't work. For this case we force it to 0x10000, too. 163 */ 164 if (pentry == KERN_IMAGE_START || pentry == 0x800) { 165 ipl->start_addr = KERN_IMAGE_START; 166 /* Overwrite parameters in the kernel image, which are "rom" */ 167 strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline); 168 } else { 169 ipl->start_addr = pentry; 170 } 171 172 if (ipl->initrd) { 173 ram_addr_t initrd_offset; 174 int initrd_size; 175 176 initrd_offset = INITRD_START; 177 while (kernel_size + 0x100000 > initrd_offset) { 178 initrd_offset += 0x100000; 179 } 180 initrd_size = load_image_targphys(ipl->initrd, initrd_offset, 181 ram_size - initrd_offset); 182 if (initrd_size == -1) { 183 error_setg(&err, "could not load initrd '%s'", ipl->initrd); 184 goto error; 185 } 186 187 /* 188 * we have to overwrite values in the kernel image, 189 * which are "rom" 190 */ 191 stq_p(rom_ptr(INITRD_PARM_START), initrd_offset); 192 stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size); 193 } 194 } 195 /* 196 * Don't ever use the migrated values, they could come from a different 197 * BIOS and therefore don't work. But still migrate the values, so 198 * QEMUs relying on it don't break. 199 */ 200 ipl->compat_start_addr = ipl->start_addr; 201 ipl->compat_bios_start_addr = ipl->bios_start_addr; 202 qemu_register_reset(qdev_reset_all_fn, dev); 203 error: 204 error_propagate(errp, err); 205 } 206 207 static Property s390_ipl_properties[] = { 208 DEFINE_PROP_STRING("kernel", S390IPLState, kernel), 209 DEFINE_PROP_STRING("initrd", S390IPLState, initrd), 210 DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline), 211 DEFINE_PROP_STRING("firmware", S390IPLState, firmware), 212 DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false), 213 DEFINE_PROP_BOOL("iplbext_migration", S390IPLState, iplbext_migration, 214 true), 215 DEFINE_PROP_END_OF_LIST(), 216 }; 217 218 static bool s390_gen_initial_iplb(S390IPLState *ipl) 219 { 220 DeviceState *dev_st; 221 222 dev_st = get_boot_device(0); 223 if (dev_st) { 224 VirtioCcwDevice *virtio_ccw_dev = (VirtioCcwDevice *) 225 object_dynamic_cast(OBJECT(qdev_get_parent_bus(dev_st)->parent), 226 TYPE_VIRTIO_CCW_DEVICE); 227 SCSIDevice *sd = (SCSIDevice *) object_dynamic_cast(OBJECT(dev_st), 228 TYPE_SCSI_DEVICE); 229 if (virtio_ccw_dev) { 230 CcwDevice *ccw_dev = CCW_DEVICE(virtio_ccw_dev); 231 232 ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_CCW_LEN); 233 ipl->iplb.blk0_len = 234 cpu_to_be32(S390_IPLB_MIN_CCW_LEN - S390_IPLB_HEADER_LEN); 235 ipl->iplb.pbt = S390_IPL_TYPE_CCW; 236 ipl->iplb.ccw.devno = cpu_to_be16(ccw_dev->sch->devno); 237 ipl->iplb.ccw.ssid = ccw_dev->sch->ssid & 3; 238 return true; 239 } else if (sd) { 240 SCSIBus *bus = scsi_bus_from_device(sd); 241 VirtIOSCSI *vdev = container_of(bus, VirtIOSCSI, bus); 242 VirtIOSCSICcw *scsi_ccw = container_of(vdev, VirtIOSCSICcw, vdev); 243 CcwDevice *ccw_dev = CCW_DEVICE(scsi_ccw); 244 245 ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_QEMU_SCSI_LEN); 246 ipl->iplb.blk0_len = 247 cpu_to_be32(S390_IPLB_MIN_QEMU_SCSI_LEN - S390_IPLB_HEADER_LEN); 248 ipl->iplb.pbt = S390_IPL_TYPE_QEMU_SCSI; 249 ipl->iplb.scsi.lun = cpu_to_be32(sd->lun); 250 ipl->iplb.scsi.target = cpu_to_be16(sd->id); 251 ipl->iplb.scsi.channel = cpu_to_be16(sd->channel); 252 ipl->iplb.scsi.devno = cpu_to_be16(ccw_dev->sch->devno); 253 ipl->iplb.scsi.ssid = ccw_dev->sch->ssid & 3; 254 return true; 255 } 256 } 257 258 return false; 259 } 260 261 void s390_ipl_update_diag308(IplParameterBlock *iplb) 262 { 263 S390IPLState *ipl = get_ipl_device(); 264 265 ipl->iplb = *iplb; 266 ipl->iplb_valid = true; 267 } 268 269 IplParameterBlock *s390_ipl_get_iplb(void) 270 { 271 S390IPLState *ipl = get_ipl_device(); 272 273 if (!ipl->iplb_valid) { 274 return NULL; 275 } 276 return &ipl->iplb; 277 } 278 279 void s390_reipl_request(void) 280 { 281 S390IPLState *ipl = get_ipl_device(); 282 283 ipl->reipl_requested = true; 284 qemu_system_reset_request(); 285 } 286 287 void s390_ipl_prepare_cpu(S390CPU *cpu) 288 { 289 S390IPLState *ipl = get_ipl_device(); 290 291 cpu->env.psw.addr = ipl->start_addr; 292 cpu->env.psw.mask = IPL_PSW_MASK; 293 294 if (!ipl->kernel || ipl->iplb_valid) { 295 cpu->env.psw.addr = ipl->bios_start_addr; 296 if (!ipl->iplb_valid) { 297 ipl->iplb_valid = s390_gen_initial_iplb(ipl); 298 } 299 } 300 } 301 302 static void s390_ipl_reset(DeviceState *dev) 303 { 304 S390IPLState *ipl = S390_IPL(dev); 305 306 if (!ipl->reipl_requested) { 307 ipl->iplb_valid = false; 308 memset(&ipl->iplb, 0, sizeof(IplParameterBlock)); 309 } 310 ipl->reipl_requested = false; 311 } 312 313 static void s390_ipl_class_init(ObjectClass *klass, void *data) 314 { 315 DeviceClass *dc = DEVICE_CLASS(klass); 316 317 dc->realize = s390_ipl_realize; 318 dc->props = s390_ipl_properties; 319 dc->reset = s390_ipl_reset; 320 dc->vmsd = &vmstate_ipl; 321 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 322 } 323 324 static const TypeInfo s390_ipl_info = { 325 .class_init = s390_ipl_class_init, 326 .parent = TYPE_DEVICE, 327 .name = TYPE_S390_IPL, 328 .instance_size = sizeof(S390IPLState), 329 }; 330 331 static void s390_ipl_register_types(void) 332 { 333 type_register_static(&s390_ipl_info); 334 } 335 336 type_init(s390_ipl_register_types) 337