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 "hw/loader.h" 18 #include "hw/sysbus.h" 19 #include "hw/s390x/virtio-ccw.h" 20 #include "hw/s390x/css.h" 21 #include "ipl.h" 22 23 #define KERN_IMAGE_START 0x010000UL 24 #define KERN_PARM_AREA 0x010480UL 25 #define INITRD_START 0x800000UL 26 #define INITRD_PARM_START 0x010408UL 27 #define INITRD_PARM_SIZE 0x010410UL 28 #define PARMFILE_START 0x001000UL 29 #define ZIPL_IMAGE_START 0x009000UL 30 #define IPL_PSW_MASK (PSW_MASK_32 | PSW_MASK_64) 31 32 #define TYPE_S390_IPL "s390-ipl" 33 #define S390_IPL(obj) \ 34 OBJECT_CHECK(S390IPLState, (obj), TYPE_S390_IPL) 35 #if 0 36 #define S390_IPL_CLASS(klass) \ 37 OBJECT_CLASS_CHECK(S390IPLState, (klass), TYPE_S390_IPL) 38 #define S390_IPL_GET_CLASS(obj) \ 39 OBJECT_GET_CLASS(S390IPLState, (obj), TYPE_S390_IPL) 40 #endif 41 42 typedef struct S390IPLClass { 43 /*< private >*/ 44 SysBusDeviceClass parent_class; 45 /*< public >*/ 46 47 void (*parent_reset) (SysBusDevice *dev); 48 } S390IPLClass; 49 50 typedef struct S390IPLState { 51 /*< private >*/ 52 SysBusDevice parent_obj; 53 uint64_t start_addr; 54 uint64_t bios_start_addr; 55 bool enforce_bios; 56 IplParameterBlock iplb; 57 bool iplb_valid; 58 bool reipl_requested; 59 60 /*< public >*/ 61 char *kernel; 62 char *initrd; 63 char *cmdline; 64 char *firmware; 65 uint8_t cssid; 66 uint8_t ssid; 67 uint16_t devno; 68 } S390IPLState; 69 70 static const VMStateDescription vmstate_iplb = { 71 .name = "ipl/iplb", 72 .version_id = 0, 73 .minimum_version_id = 0, 74 .fields = (VMStateField[]) { 75 VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110), 76 VMSTATE_UINT16(devno, IplParameterBlock), 77 VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88), 78 VMSTATE_END_OF_LIST() 79 } 80 }; 81 82 static const VMStateDescription vmstate_ipl = { 83 .name = "ipl", 84 .version_id = 0, 85 .minimum_version_id = 0, 86 .fields = (VMStateField[]) { 87 VMSTATE_UINT64(start_addr, S390IPLState), 88 VMSTATE_UINT64(bios_start_addr, S390IPLState), 89 VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock), 90 VMSTATE_BOOL(iplb_valid, S390IPLState), 91 VMSTATE_UINT8(cssid, S390IPLState), 92 VMSTATE_UINT8(ssid, S390IPLState), 93 VMSTATE_UINT16(devno, S390IPLState), 94 VMSTATE_END_OF_LIST() 95 } 96 }; 97 98 static S390IPLState *get_ipl_device(void) 99 { 100 return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL)); 101 } 102 103 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr) 104 { 105 uint64_t dstaddr = *(uint64_t *) opaque; 106 /* 107 * Assuming that our s390-ccw.img was linked for starting at address 0, 108 * we can simply add the destination address for the final location 109 */ 110 return srcaddr + dstaddr; 111 } 112 113 static int s390_ipl_init(SysBusDevice *dev) 114 { 115 S390IPLState *ipl = S390_IPL(dev); 116 uint64_t pentry = KERN_IMAGE_START; 117 int kernel_size; 118 119 int bios_size; 120 char *bios_filename; 121 122 /* 123 * Always load the bios if it was enforced, 124 * even if an external kernel has been defined. 125 */ 126 if (!ipl->kernel || ipl->enforce_bios) { 127 uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL; 128 129 if (bios_name == NULL) { 130 bios_name = ipl->firmware; 131 } 132 133 bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 134 if (bios_filename == NULL) { 135 hw_error("could not find stage1 bootloader\n"); 136 } 137 138 bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase, 139 &ipl->bios_start_addr, NULL, NULL, 1, 140 EM_S390, 0); 141 if (bios_size > 0) { 142 /* Adjust ELF start address to final location */ 143 ipl->bios_start_addr += fwbase; 144 } else { 145 /* Try to load non-ELF file (e.g. s390-zipl.rom) */ 146 bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START, 147 4096); 148 ipl->bios_start_addr = ZIPL_IMAGE_START; 149 } 150 g_free(bios_filename); 151 152 if (bios_size == -1) { 153 hw_error("could not load bootloader '%s'\n", bios_name); 154 } 155 156 /* default boot target is the bios */ 157 ipl->start_addr = ipl->bios_start_addr; 158 } 159 160 if (ipl->kernel) { 161 kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL, 162 NULL, 1, EM_S390, 0); 163 if (kernel_size < 0) { 164 kernel_size = load_image_targphys(ipl->kernel, 0, ram_size); 165 } 166 if (kernel_size < 0) { 167 fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel); 168 return -1; 169 } 170 /* 171 * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the 172 * kernel parameters here as well. Note: For old kernels (up to 3.2) 173 * we can not rely on the ELF entry point - it was 0x800 (the SALIPL 174 * loader) and it won't work. For this case we force it to 0x10000, too. 175 */ 176 if (pentry == KERN_IMAGE_START || pentry == 0x800) { 177 ipl->start_addr = KERN_IMAGE_START; 178 /* Overwrite parameters in the kernel image, which are "rom" */ 179 strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline); 180 } else { 181 ipl->start_addr = pentry; 182 } 183 184 if (ipl->initrd) { 185 ram_addr_t initrd_offset; 186 int initrd_size; 187 188 initrd_offset = INITRD_START; 189 while (kernel_size + 0x100000 > initrd_offset) { 190 initrd_offset += 0x100000; 191 } 192 initrd_size = load_image_targphys(ipl->initrd, initrd_offset, 193 ram_size - initrd_offset); 194 if (initrd_size == -1) { 195 fprintf(stderr, "qemu: could not load initrd '%s'\n", 196 ipl->initrd); 197 exit(1); 198 } 199 200 /* 201 * we have to overwrite values in the kernel image, 202 * which are "rom" 203 */ 204 stq_p(rom_ptr(INITRD_PARM_START), initrd_offset); 205 stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size); 206 } 207 } 208 return 0; 209 } 210 211 static Property s390_ipl_properties[] = { 212 DEFINE_PROP_STRING("kernel", S390IPLState, kernel), 213 DEFINE_PROP_STRING("initrd", S390IPLState, initrd), 214 DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline), 215 DEFINE_PROP_STRING("firmware", S390IPLState, firmware), 216 DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false), 217 DEFINE_PROP_END_OF_LIST(), 218 }; 219 220 /* 221 * In addition to updating the iplstate, this function returns: 222 * - 0 if system was ipled with external kernel 223 * - -1 if no valid boot device was found 224 * - ccw id of the boot device otherwise 225 */ 226 static uint64_t s390_update_iplstate(S390IPLState *ipl) 227 { 228 DeviceState *dev_st; 229 230 if (ipl->iplb_valid) { 231 ipl->cssid = 0; 232 ipl->ssid = 0; 233 ipl->devno = ipl->iplb.devno; 234 goto out; 235 } 236 237 if (ipl->kernel) { 238 return 0; 239 } 240 241 dev_st = get_boot_device(0); 242 if (dev_st) { 243 VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast( 244 OBJECT(qdev_get_parent_bus(dev_st)->parent), 245 TYPE_VIRTIO_CCW_DEVICE); 246 if (ccw_dev) { 247 ipl->cssid = ccw_dev->sch->cssid; 248 ipl->ssid = ccw_dev->sch->ssid; 249 ipl->devno = ccw_dev->sch->devno; 250 goto out; 251 } 252 } 253 254 return -1; 255 out: 256 return (uint32_t) (ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno); 257 } 258 259 void s390_ipl_update_diag308(IplParameterBlock *iplb) 260 { 261 S390IPLState *ipl = get_ipl_device(); 262 263 ipl->iplb = *iplb; 264 ipl->iplb_valid = true; 265 } 266 267 IplParameterBlock *s390_ipl_get_iplb(void) 268 { 269 S390IPLState *ipl = get_ipl_device(); 270 271 if (!ipl->iplb_valid) { 272 return NULL; 273 } 274 return &ipl->iplb; 275 } 276 277 void s390_reipl_request(void) 278 { 279 S390IPLState *ipl = get_ipl_device(); 280 281 ipl->reipl_requested = true; 282 qemu_system_reset_request(); 283 } 284 285 void s390_ipl_prepare_cpu(S390CPU *cpu) 286 { 287 S390IPLState *ipl = get_ipl_device(); 288 289 cpu->env.psw.addr = ipl->start_addr; 290 cpu->env.psw.mask = IPL_PSW_MASK; 291 292 if (!ipl->kernel || ipl->iplb_valid) { 293 cpu->env.psw.addr = ipl->bios_start_addr; 294 cpu->env.regs[7] = s390_update_iplstate(ipl); 295 } 296 } 297 298 static void s390_ipl_reset(DeviceState *dev) 299 { 300 S390IPLState *ipl = S390_IPL(dev); 301 302 if (!ipl->reipl_requested) { 303 ipl->iplb_valid = false; 304 } 305 ipl->reipl_requested = false; 306 } 307 308 static void s390_ipl_class_init(ObjectClass *klass, void *data) 309 { 310 DeviceClass *dc = DEVICE_CLASS(klass); 311 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); 312 313 k->init = s390_ipl_init; 314 dc->props = s390_ipl_properties; 315 dc->reset = s390_ipl_reset; 316 dc->vmsd = &vmstate_ipl; 317 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 318 } 319 320 static const TypeInfo s390_ipl_info = { 321 .class_init = s390_ipl_class_init, 322 .parent = TYPE_SYS_BUS_DEVICE, 323 .name = "s390-ipl", 324 .instance_size = sizeof(S390IPLState), 325 }; 326 327 static void s390_ipl_register_types(void) 328 { 329 type_register_static(&s390_ipl_info); 330 } 331 332 type_init(s390_ipl_register_types) 333