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 "sysemu/sysemu.h" 15 #include "cpu.h" 16 #include "elf.h" 17 #include "exec/ram_addr.h" 18 #include "hw/loader.h" 19 #include "hw/sysbus.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 #define TYPE_S390_IPL "s390-ipl" 34 #define S390_IPL(obj) \ 35 OBJECT_CHECK(S390IPLState, (obj), TYPE_S390_IPL) 36 #if 0 37 #define S390_IPL_CLASS(klass) \ 38 OBJECT_CLASS_CHECK(S390IPLState, (klass), TYPE_S390_IPL) 39 #define S390_IPL_GET_CLASS(obj) \ 40 OBJECT_GET_CLASS(S390IPLState, (obj), TYPE_S390_IPL) 41 #endif 42 43 typedef struct S390IPLClass { 44 /*< private >*/ 45 SysBusDeviceClass parent_class; 46 /*< public >*/ 47 48 void (*parent_reset) (SysBusDevice *dev); 49 } S390IPLClass; 50 51 typedef struct S390IPLState { 52 /*< private >*/ 53 SysBusDevice parent_obj; 54 uint64_t start_addr; 55 uint64_t bios_start_addr; 56 bool enforce_bios; 57 IplParameterBlock iplb; 58 bool iplb_valid; 59 bool reipl_requested; 60 61 /*< public >*/ 62 char *kernel; 63 char *initrd; 64 char *cmdline; 65 char *firmware; 66 uint8_t cssid; 67 uint8_t ssid; 68 uint16_t devno; 69 } S390IPLState; 70 71 static const VMStateDescription vmstate_iplb = { 72 .name = "ipl/iplb", 73 .version_id = 0, 74 .minimum_version_id = 0, 75 .fields = (VMStateField[]) { 76 VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110), 77 VMSTATE_UINT16(devno, IplParameterBlock), 78 VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88), 79 VMSTATE_END_OF_LIST() 80 } 81 }; 82 83 static const VMStateDescription vmstate_ipl = { 84 .name = "ipl", 85 .version_id = 0, 86 .minimum_version_id = 0, 87 .fields = (VMStateField[]) { 88 VMSTATE_UINT64(start_addr, S390IPLState), 89 VMSTATE_UINT64(bios_start_addr, S390IPLState), 90 VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock), 91 VMSTATE_BOOL(iplb_valid, S390IPLState), 92 VMSTATE_UINT8(cssid, S390IPLState), 93 VMSTATE_UINT8(ssid, S390IPLState), 94 VMSTATE_UINT16(devno, S390IPLState), 95 VMSTATE_END_OF_LIST() 96 } 97 }; 98 99 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr) 100 { 101 uint64_t dstaddr = *(uint64_t *) opaque; 102 /* 103 * Assuming that our s390-ccw.img was linked for starting at address 0, 104 * we can simply add the destination address for the final location 105 */ 106 return srcaddr + dstaddr; 107 } 108 109 static int s390_ipl_init(SysBusDevice *dev) 110 { 111 S390IPLState *ipl = S390_IPL(dev); 112 uint64_t pentry = KERN_IMAGE_START; 113 int kernel_size; 114 115 int bios_size; 116 char *bios_filename; 117 118 /* 119 * Always load the bios if it was enforced, 120 * even if an external kernel has been defined. 121 */ 122 if (!ipl->kernel || ipl->enforce_bios) { 123 uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL; 124 125 if (bios_name == NULL) { 126 bios_name = ipl->firmware; 127 } 128 129 bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 130 if (bios_filename == NULL) { 131 hw_error("could not find stage1 bootloader\n"); 132 } 133 134 bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase, 135 &ipl->bios_start_addr, NULL, NULL, 1, 136 ELF_MACHINE, 0); 137 if (bios_size > 0) { 138 /* Adjust ELF start address to final location */ 139 ipl->bios_start_addr += fwbase; 140 } else { 141 /* Try to load non-ELF file (e.g. s390-zipl.rom) */ 142 bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START, 143 4096); 144 ipl->bios_start_addr = ZIPL_IMAGE_START; 145 } 146 g_free(bios_filename); 147 148 if (bios_size == -1) { 149 hw_error("could not load bootloader '%s'\n", bios_name); 150 } 151 152 /* default boot target is the bios */ 153 ipl->start_addr = ipl->bios_start_addr; 154 } 155 156 if (ipl->kernel) { 157 kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL, 158 NULL, 1, ELF_MACHINE, 0); 159 if (kernel_size < 0) { 160 kernel_size = load_image_targphys(ipl->kernel, 0, ram_size); 161 } 162 if (kernel_size < 0) { 163 fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel); 164 return -1; 165 } 166 /* 167 * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the 168 * kernel parameters here as well. Note: For old kernels (up to 3.2) 169 * we can not rely on the ELF entry point - it was 0x800 (the SALIPL 170 * loader) and it won't work. For this case we force it to 0x10000, too. 171 */ 172 if (pentry == KERN_IMAGE_START || pentry == 0x800) { 173 ipl->start_addr = KERN_IMAGE_START; 174 /* Overwrite parameters in the kernel image, which are "rom" */ 175 strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline); 176 } else { 177 ipl->start_addr = pentry; 178 } 179 180 if (ipl->initrd) { 181 ram_addr_t initrd_offset; 182 int initrd_size; 183 184 initrd_offset = INITRD_START; 185 while (kernel_size + 0x100000 > initrd_offset) { 186 initrd_offset += 0x100000; 187 } 188 initrd_size = load_image_targphys(ipl->initrd, initrd_offset, 189 ram_size - initrd_offset); 190 if (initrd_size == -1) { 191 fprintf(stderr, "qemu: could not load initrd '%s'\n", 192 ipl->initrd); 193 exit(1); 194 } 195 196 /* 197 * we have to overwrite values in the kernel image, 198 * which are "rom" 199 */ 200 stq_p(rom_ptr(INITRD_PARM_START), initrd_offset); 201 stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size); 202 } 203 } 204 return 0; 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_END_OF_LIST(), 214 }; 215 216 /* 217 * In addition to updating the iplstate, this function returns: 218 * - 0 if system was ipled with external kernel 219 * - -1 if no valid boot device was found 220 * - ccw id of the boot device otherwise 221 */ 222 static uint64_t s390_update_iplstate(CPUS390XState *env, S390IPLState *ipl) 223 { 224 DeviceState *dev_st; 225 226 if (ipl->iplb_valid) { 227 ipl->cssid = 0; 228 ipl->ssid = 0; 229 ipl->devno = ipl->iplb.devno; 230 goto out; 231 } 232 233 if (ipl->kernel) { 234 return 0; 235 } 236 237 dev_st = get_boot_device(0); 238 if (dev_st) { 239 VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast( 240 OBJECT(qdev_get_parent_bus(dev_st)->parent), 241 TYPE_VIRTIO_CCW_DEVICE); 242 if (ccw_dev) { 243 ipl->cssid = ccw_dev->sch->cssid; 244 ipl->ssid = ccw_dev->sch->ssid; 245 ipl->devno = ccw_dev->sch->devno; 246 goto out; 247 } 248 } 249 250 return -1; 251 out: 252 return ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno; 253 } 254 255 int s390_ipl_update_diag308(IplParameterBlock *iplb) 256 { 257 S390IPLState *ipl; 258 259 ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL)); 260 if (ipl) { 261 ipl->iplb = *iplb; 262 ipl->iplb_valid = true; 263 return 0; 264 } 265 return -1; 266 } 267 268 IplParameterBlock *s390_ipl_get_iplb(void) 269 { 270 S390IPLState *ipl; 271 272 ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL)); 273 if (!ipl || !ipl->iplb_valid) { 274 return NULL; 275 } 276 return &ipl->iplb; 277 } 278 279 void s390_reipl_request(void) 280 { 281 S390IPLState *ipl; 282 283 ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL)); 284 ipl->reipl_requested = true; 285 qemu_system_reset_request(); 286 } 287 288 static void s390_ipl_reset(DeviceState *dev) 289 { 290 S390IPLState *ipl = S390_IPL(dev); 291 S390CPU *cpu = S390_CPU(qemu_get_cpu(0)); 292 CPUS390XState *env = &cpu->env; 293 294 env->psw.addr = ipl->start_addr; 295 env->psw.mask = IPL_PSW_MASK; 296 297 if (!ipl->reipl_requested) { 298 ipl->iplb_valid = false; 299 } 300 ipl->reipl_requested = false; 301 302 if (!ipl->kernel || ipl->iplb_valid) { 303 env->psw.addr = ipl->bios_start_addr; 304 env->regs[7] = s390_update_iplstate(env, ipl); 305 } 306 307 s390_cpu_set_state(CPU_STATE_OPERATING, cpu); 308 } 309 310 static void s390_ipl_class_init(ObjectClass *klass, void *data) 311 { 312 DeviceClass *dc = DEVICE_CLASS(klass); 313 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); 314 315 k->init = s390_ipl_init; 316 dc->props = s390_ipl_properties; 317 dc->reset = s390_ipl_reset; 318 dc->vmsd = &vmstate_ipl; 319 } 320 321 static const TypeInfo s390_ipl_info = { 322 .class_init = s390_ipl_class_init, 323 .parent = TYPE_SYS_BUS_DEVICE, 324 .name = "s390-ipl", 325 .instance_size = sizeof(S390IPLState), 326 }; 327 328 static void s390_ipl_register_types(void) 329 { 330 type_register_static(&s390_ipl_info); 331 } 332 333 type_init(s390_ipl_register_types) 334