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 const VMStateDescription vmstate_iplb = { 34 .name = "ipl/iplb", 35 .version_id = 0, 36 .minimum_version_id = 0, 37 .fields = (VMStateField[]) { 38 VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110), 39 VMSTATE_UINT16(devno, IplParameterBlock), 40 VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88), 41 VMSTATE_END_OF_LIST() 42 } 43 }; 44 45 static const VMStateDescription vmstate_ipl = { 46 .name = "ipl", 47 .version_id = 0, 48 .minimum_version_id = 0, 49 .fields = (VMStateField[]) { 50 VMSTATE_UINT64(start_addr, S390IPLState), 51 VMSTATE_UINT64(bios_start_addr, S390IPLState), 52 VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock), 53 VMSTATE_BOOL(iplb_valid, S390IPLState), 54 VMSTATE_UINT8(cssid, S390IPLState), 55 VMSTATE_UINT8(ssid, S390IPLState), 56 VMSTATE_UINT16(devno, S390IPLState), 57 VMSTATE_END_OF_LIST() 58 } 59 }; 60 61 static S390IPLState *get_ipl_device(void) 62 { 63 return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL)); 64 } 65 66 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr) 67 { 68 uint64_t dstaddr = *(uint64_t *) opaque; 69 /* 70 * Assuming that our s390-ccw.img was linked for starting at address 0, 71 * we can simply add the destination address for the final location 72 */ 73 return srcaddr + dstaddr; 74 } 75 76 static void s390_ipl_realize(DeviceState *dev, Error **errp) 77 { 78 S390IPLState *ipl = S390_IPL(dev); 79 uint64_t pentry = KERN_IMAGE_START; 80 int kernel_size; 81 Error *err = NULL; 82 83 int bios_size; 84 char *bios_filename; 85 86 /* 87 * Always load the bios if it was enforced, 88 * even if an external kernel has been defined. 89 */ 90 if (!ipl->kernel || ipl->enforce_bios) { 91 uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL; 92 93 if (bios_name == NULL) { 94 bios_name = ipl->firmware; 95 } 96 97 bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 98 if (bios_filename == NULL) { 99 error_setg(&err, "could not find stage1 bootloader"); 100 goto error; 101 } 102 103 bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase, 104 &ipl->bios_start_addr, NULL, NULL, 1, 105 EM_S390, 0, 0); 106 if (bios_size > 0) { 107 /* Adjust ELF start address to final location */ 108 ipl->bios_start_addr += fwbase; 109 } else { 110 /* Try to load non-ELF file (e.g. s390-ccw.img) */ 111 bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START, 112 4096); 113 ipl->bios_start_addr = ZIPL_IMAGE_START; 114 } 115 g_free(bios_filename); 116 117 if (bios_size == -1) { 118 error_setg(&err, "could not load bootloader '%s'", bios_name); 119 goto error; 120 } 121 122 /* default boot target is the bios */ 123 ipl->start_addr = ipl->bios_start_addr; 124 } 125 126 if (ipl->kernel) { 127 kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL, 128 NULL, 1, EM_S390, 0, 0); 129 if (kernel_size < 0) { 130 kernel_size = load_image_targphys(ipl->kernel, 0, ram_size); 131 } 132 if (kernel_size < 0) { 133 error_setg(&err, "could not load kernel '%s'", ipl->kernel); 134 goto error; 135 } 136 /* 137 * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the 138 * kernel parameters here as well. Note: For old kernels (up to 3.2) 139 * we can not rely on the ELF entry point - it was 0x800 (the SALIPL 140 * loader) and it won't work. For this case we force it to 0x10000, too. 141 */ 142 if (pentry == KERN_IMAGE_START || pentry == 0x800) { 143 ipl->start_addr = KERN_IMAGE_START; 144 /* Overwrite parameters in the kernel image, which are "rom" */ 145 strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline); 146 } else { 147 ipl->start_addr = pentry; 148 } 149 150 if (ipl->initrd) { 151 ram_addr_t initrd_offset; 152 int initrd_size; 153 154 initrd_offset = INITRD_START; 155 while (kernel_size + 0x100000 > initrd_offset) { 156 initrd_offset += 0x100000; 157 } 158 initrd_size = load_image_targphys(ipl->initrd, initrd_offset, 159 ram_size - initrd_offset); 160 if (initrd_size == -1) { 161 error_setg(&err, "could not load initrd '%s'", ipl->initrd); 162 goto error; 163 } 164 165 /* 166 * we have to overwrite values in the kernel image, 167 * which are "rom" 168 */ 169 stq_p(rom_ptr(INITRD_PARM_START), initrd_offset); 170 stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size); 171 } 172 } 173 qemu_register_reset(qdev_reset_all_fn, dev); 174 error: 175 error_propagate(errp, err); 176 } 177 178 static Property s390_ipl_properties[] = { 179 DEFINE_PROP_STRING("kernel", S390IPLState, kernel), 180 DEFINE_PROP_STRING("initrd", S390IPLState, initrd), 181 DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline), 182 DEFINE_PROP_STRING("firmware", S390IPLState, firmware), 183 DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false), 184 DEFINE_PROP_END_OF_LIST(), 185 }; 186 187 /* 188 * In addition to updating the iplstate, this function returns: 189 * - 0 if system was ipled with external kernel 190 * - -1 if no valid boot device was found 191 * - ccw id of the boot device otherwise 192 */ 193 static uint64_t s390_update_iplstate(S390IPLState *ipl) 194 { 195 DeviceState *dev_st; 196 197 if (ipl->iplb_valid) { 198 ipl->cssid = 0; 199 ipl->ssid = 0; 200 ipl->devno = ipl->iplb.devno; 201 goto out; 202 } 203 204 if (ipl->kernel) { 205 return 0; 206 } 207 208 dev_st = get_boot_device(0); 209 if (dev_st) { 210 VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast( 211 OBJECT(qdev_get_parent_bus(dev_st)->parent), 212 TYPE_VIRTIO_CCW_DEVICE); 213 if (ccw_dev) { 214 ipl->cssid = ccw_dev->sch->cssid; 215 ipl->ssid = ccw_dev->sch->ssid; 216 ipl->devno = ccw_dev->sch->devno; 217 goto out; 218 } 219 } 220 221 return -1; 222 out: 223 return (uint32_t) (ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno); 224 } 225 226 void s390_ipl_update_diag308(IplParameterBlock *iplb) 227 { 228 S390IPLState *ipl = get_ipl_device(); 229 230 ipl->iplb = *iplb; 231 ipl->iplb_valid = true; 232 } 233 234 IplParameterBlock *s390_ipl_get_iplb(void) 235 { 236 S390IPLState *ipl = get_ipl_device(); 237 238 if (!ipl->iplb_valid) { 239 return NULL; 240 } 241 return &ipl->iplb; 242 } 243 244 void s390_reipl_request(void) 245 { 246 S390IPLState *ipl = get_ipl_device(); 247 248 ipl->reipl_requested = true; 249 qemu_system_reset_request(); 250 } 251 252 void s390_ipl_prepare_cpu(S390CPU *cpu) 253 { 254 S390IPLState *ipl = get_ipl_device(); 255 256 cpu->env.psw.addr = ipl->start_addr; 257 cpu->env.psw.mask = IPL_PSW_MASK; 258 259 if (!ipl->kernel || ipl->iplb_valid) { 260 cpu->env.psw.addr = ipl->bios_start_addr; 261 cpu->env.regs[7] = s390_update_iplstate(ipl); 262 } 263 } 264 265 static void s390_ipl_reset(DeviceState *dev) 266 { 267 S390IPLState *ipl = S390_IPL(dev); 268 269 if (!ipl->reipl_requested) { 270 ipl->iplb_valid = false; 271 } 272 ipl->reipl_requested = false; 273 } 274 275 static void s390_ipl_class_init(ObjectClass *klass, void *data) 276 { 277 DeviceClass *dc = DEVICE_CLASS(klass); 278 279 dc->realize = s390_ipl_realize; 280 dc->props = s390_ipl_properties; 281 dc->reset = s390_ipl_reset; 282 dc->vmsd = &vmstate_ipl; 283 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 284 } 285 286 static const TypeInfo s390_ipl_info = { 287 .class_init = s390_ipl_class_init, 288 .parent = TYPE_DEVICE, 289 .name = TYPE_S390_IPL, 290 .instance_size = sizeof(S390IPLState), 291 }; 292 293 static void s390_ipl_register_types(void) 294 { 295 type_register_static(&s390_ipl_info); 296 } 297 298 type_init(s390_ipl_register_types) 299