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 "sysemu/sysemu.h" 16 #include "cpu.h" 17 #include "elf.h" 18 #include "hw/loader.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 static const VMStateDescription vmstate_iplb = { 33 .name = "ipl/iplb", 34 .version_id = 0, 35 .minimum_version_id = 0, 36 .fields = (VMStateField[]) { 37 VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110), 38 VMSTATE_UINT16(devno, IplParameterBlock), 39 VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88), 40 VMSTATE_END_OF_LIST() 41 } 42 }; 43 44 static const VMStateDescription vmstate_ipl = { 45 .name = "ipl", 46 .version_id = 0, 47 .minimum_version_id = 0, 48 .fields = (VMStateField[]) { 49 VMSTATE_UINT64(start_addr, S390IPLState), 50 VMSTATE_UINT64(bios_start_addr, S390IPLState), 51 VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock), 52 VMSTATE_BOOL(iplb_valid, S390IPLState), 53 VMSTATE_UINT8(cssid, S390IPLState), 54 VMSTATE_UINT8(ssid, S390IPLState), 55 VMSTATE_UINT16(devno, S390IPLState), 56 VMSTATE_END_OF_LIST() 57 } 58 }; 59 60 static S390IPLState *get_ipl_device(void) 61 { 62 return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL)); 63 } 64 65 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr) 66 { 67 uint64_t dstaddr = *(uint64_t *) opaque; 68 /* 69 * Assuming that our s390-ccw.img was linked for starting at address 0, 70 * we can simply add the destination address for the final location 71 */ 72 return srcaddr + dstaddr; 73 } 74 75 static void s390_ipl_realize(DeviceState *dev, Error **errp) 76 { 77 S390IPLState *ipl = S390_IPL(dev); 78 uint64_t pentry = KERN_IMAGE_START; 79 int kernel_size; 80 Error *err = NULL; 81 82 int bios_size; 83 char *bios_filename; 84 85 /* 86 * Always load the bios if it was enforced, 87 * even if an external kernel has been defined. 88 */ 89 if (!ipl->kernel || ipl->enforce_bios) { 90 uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL; 91 92 if (bios_name == NULL) { 93 bios_name = ipl->firmware; 94 } 95 96 bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 97 if (bios_filename == NULL) { 98 error_setg(&err, "could not find stage1 bootloader"); 99 goto error; 100 } 101 102 bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase, 103 &ipl->bios_start_addr, NULL, NULL, 1, 104 EM_S390, 0); 105 if (bios_size > 0) { 106 /* Adjust ELF start address to final location */ 107 ipl->bios_start_addr += fwbase; 108 } else { 109 /* Try to load non-ELF file (e.g. s390-ccw.img) */ 110 bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START, 111 4096); 112 ipl->bios_start_addr = ZIPL_IMAGE_START; 113 } 114 g_free(bios_filename); 115 116 if (bios_size == -1) { 117 error_setg(&err, "could not load bootloader '%s'", bios_name); 118 goto error; 119 } 120 121 /* default boot target is the bios */ 122 ipl->start_addr = ipl->bios_start_addr; 123 } 124 125 if (ipl->kernel) { 126 kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL, 127 NULL, 1, EM_S390, 0); 128 if (kernel_size < 0) { 129 kernel_size = load_image_targphys(ipl->kernel, 0, ram_size); 130 } 131 if (kernel_size < 0) { 132 error_setg(&err, "could not load kernel '%s'", ipl->kernel); 133 goto error; 134 } 135 /* 136 * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the 137 * kernel parameters here as well. Note: For old kernels (up to 3.2) 138 * we can not rely on the ELF entry point - it was 0x800 (the SALIPL 139 * loader) and it won't work. For this case we force it to 0x10000, too. 140 */ 141 if (pentry == KERN_IMAGE_START || pentry == 0x800) { 142 ipl->start_addr = KERN_IMAGE_START; 143 /* Overwrite parameters in the kernel image, which are "rom" */ 144 strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline); 145 } else { 146 ipl->start_addr = pentry; 147 } 148 149 if (ipl->initrd) { 150 ram_addr_t initrd_offset; 151 int initrd_size; 152 153 initrd_offset = INITRD_START; 154 while (kernel_size + 0x100000 > initrd_offset) { 155 initrd_offset += 0x100000; 156 } 157 initrd_size = load_image_targphys(ipl->initrd, initrd_offset, 158 ram_size - initrd_offset); 159 if (initrd_size == -1) { 160 error_setg(&err, "could not load initrd '%s'", ipl->initrd); 161 goto error; 162 } 163 164 /* 165 * we have to overwrite values in the kernel image, 166 * which are "rom" 167 */ 168 stq_p(rom_ptr(INITRD_PARM_START), initrd_offset); 169 stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size); 170 } 171 } 172 qemu_register_reset(qdev_reset_all_fn, dev); 173 error: 174 error_propagate(errp, err); 175 } 176 177 static Property s390_ipl_properties[] = { 178 DEFINE_PROP_STRING("kernel", S390IPLState, kernel), 179 DEFINE_PROP_STRING("initrd", S390IPLState, initrd), 180 DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline), 181 DEFINE_PROP_STRING("firmware", S390IPLState, firmware), 182 DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false), 183 DEFINE_PROP_END_OF_LIST(), 184 }; 185 186 /* 187 * In addition to updating the iplstate, this function returns: 188 * - 0 if system was ipled with external kernel 189 * - -1 if no valid boot device was found 190 * - ccw id of the boot device otherwise 191 */ 192 static uint64_t s390_update_iplstate(S390IPLState *ipl) 193 { 194 DeviceState *dev_st; 195 196 if (ipl->iplb_valid) { 197 ipl->cssid = 0; 198 ipl->ssid = 0; 199 ipl->devno = ipl->iplb.devno; 200 goto out; 201 } 202 203 if (ipl->kernel) { 204 return 0; 205 } 206 207 dev_st = get_boot_device(0); 208 if (dev_st) { 209 VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast( 210 OBJECT(qdev_get_parent_bus(dev_st)->parent), 211 TYPE_VIRTIO_CCW_DEVICE); 212 if (ccw_dev) { 213 ipl->cssid = ccw_dev->sch->cssid; 214 ipl->ssid = ccw_dev->sch->ssid; 215 ipl->devno = ccw_dev->sch->devno; 216 goto out; 217 } 218 } 219 220 return -1; 221 out: 222 return (uint32_t) (ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno); 223 } 224 225 void s390_ipl_update_diag308(IplParameterBlock *iplb) 226 { 227 S390IPLState *ipl = get_ipl_device(); 228 229 ipl->iplb = *iplb; 230 ipl->iplb_valid = true; 231 } 232 233 IplParameterBlock *s390_ipl_get_iplb(void) 234 { 235 S390IPLState *ipl = get_ipl_device(); 236 237 if (!ipl->iplb_valid) { 238 return NULL; 239 } 240 return &ipl->iplb; 241 } 242 243 void s390_reipl_request(void) 244 { 245 S390IPLState *ipl = get_ipl_device(); 246 247 ipl->reipl_requested = true; 248 qemu_system_reset_request(); 249 } 250 251 void s390_ipl_prepare_cpu(S390CPU *cpu) 252 { 253 S390IPLState *ipl = get_ipl_device(); 254 255 cpu->env.psw.addr = ipl->start_addr; 256 cpu->env.psw.mask = IPL_PSW_MASK; 257 258 if (!ipl->kernel || ipl->iplb_valid) { 259 cpu->env.psw.addr = ipl->bios_start_addr; 260 cpu->env.regs[7] = s390_update_iplstate(ipl); 261 } 262 } 263 264 static void s390_ipl_reset(DeviceState *dev) 265 { 266 S390IPLState *ipl = S390_IPL(dev); 267 268 if (!ipl->reipl_requested) { 269 ipl->iplb_valid = false; 270 } 271 ipl->reipl_requested = false; 272 } 273 274 static void s390_ipl_class_init(ObjectClass *klass, void *data) 275 { 276 DeviceClass *dc = DEVICE_CLASS(klass); 277 278 dc->realize = s390_ipl_realize; 279 dc->props = s390_ipl_properties; 280 dc->reset = s390_ipl_reset; 281 dc->vmsd = &vmstate_ipl; 282 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 283 } 284 285 static const TypeInfo s390_ipl_info = { 286 .class_init = s390_ipl_class_init, 287 .parent = TYPE_DEVICE, 288 .name = TYPE_S390_IPL, 289 .instance_size = sizeof(S390IPLState), 290 }; 291 292 static void s390_ipl_register_types(void) 293 { 294 type_register_static(&s390_ipl_info); 295 } 296 297 type_init(s390_ipl_register_types) 298