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/s390x/virtio-ccw.h" 19 #include "hw/s390x/css.h" 20 #include "ipl.h" 21 22 #define KERN_IMAGE_START 0x010000UL 23 #define KERN_PARM_AREA 0x010480UL 24 #define INITRD_START 0x800000UL 25 #define INITRD_PARM_START 0x010408UL 26 #define INITRD_PARM_SIZE 0x010410UL 27 #define PARMFILE_START 0x001000UL 28 #define ZIPL_IMAGE_START 0x009000UL 29 #define IPL_PSW_MASK (PSW_MASK_32 | PSW_MASK_64) 30 31 static const VMStateDescription vmstate_iplb = { 32 .name = "ipl/iplb", 33 .version_id = 0, 34 .minimum_version_id = 0, 35 .fields = (VMStateField[]) { 36 VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110), 37 VMSTATE_UINT16(devno, IplParameterBlock), 38 VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88), 39 VMSTATE_END_OF_LIST() 40 } 41 }; 42 43 static const VMStateDescription vmstate_ipl = { 44 .name = "ipl", 45 .version_id = 0, 46 .minimum_version_id = 0, 47 .fields = (VMStateField[]) { 48 VMSTATE_UINT64(start_addr, S390IPLState), 49 VMSTATE_UINT64(bios_start_addr, S390IPLState), 50 VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock), 51 VMSTATE_BOOL(iplb_valid, S390IPLState), 52 VMSTATE_UINT8(cssid, S390IPLState), 53 VMSTATE_UINT8(ssid, S390IPLState), 54 VMSTATE_UINT16(devno, S390IPLState), 55 VMSTATE_END_OF_LIST() 56 } 57 }; 58 59 static S390IPLState *get_ipl_device(void) 60 { 61 return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL)); 62 } 63 64 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr) 65 { 66 uint64_t dstaddr = *(uint64_t *) opaque; 67 /* 68 * Assuming that our s390-ccw.img was linked for starting at address 0, 69 * we can simply add the destination address for the final location 70 */ 71 return srcaddr + dstaddr; 72 } 73 74 static void s390_ipl_realize(DeviceState *dev, Error **errp) 75 { 76 S390IPLState *ipl = S390_IPL(dev); 77 uint64_t pentry = KERN_IMAGE_START; 78 int kernel_size; 79 Error *l_err = NULL; 80 81 int bios_size; 82 char *bios_filename; 83 84 /* 85 * Always load the bios if it was enforced, 86 * even if an external kernel has been defined. 87 */ 88 if (!ipl->kernel || ipl->enforce_bios) { 89 uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL; 90 91 if (bios_name == NULL) { 92 bios_name = ipl->firmware; 93 } 94 95 bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 96 if (bios_filename == NULL) { 97 error_setg(&l_err, "could not find stage1 bootloader\n"); 98 goto error; 99 } 100 101 bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase, 102 &ipl->bios_start_addr, NULL, NULL, 1, 103 EM_S390, 0); 104 if (bios_size > 0) { 105 /* Adjust ELF start address to final location */ 106 ipl->bios_start_addr += fwbase; 107 } else { 108 /* Try to load non-ELF file (e.g. s390-zipl.rom) */ 109 bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START, 110 4096); 111 ipl->bios_start_addr = ZIPL_IMAGE_START; 112 } 113 g_free(bios_filename); 114 115 if (bios_size == -1) { 116 error_setg(&l_err, "could not load bootloader '%s'\n", bios_name); 117 goto error; 118 } 119 120 /* default boot target is the bios */ 121 ipl->start_addr = ipl->bios_start_addr; 122 } 123 124 if (ipl->kernel) { 125 kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL, 126 NULL, 1, EM_S390, 0); 127 if (kernel_size < 0) { 128 kernel_size = load_image_targphys(ipl->kernel, 0, ram_size); 129 } 130 if (kernel_size < 0) { 131 error_setg(&l_err, "could not load kernel '%s'\n", ipl->kernel); 132 goto error; 133 } 134 /* 135 * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the 136 * kernel parameters here as well. Note: For old kernels (up to 3.2) 137 * we can not rely on the ELF entry point - it was 0x800 (the SALIPL 138 * loader) and it won't work. For this case we force it to 0x10000, too. 139 */ 140 if (pentry == KERN_IMAGE_START || pentry == 0x800) { 141 ipl->start_addr = KERN_IMAGE_START; 142 /* Overwrite parameters in the kernel image, which are "rom" */ 143 strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline); 144 } else { 145 ipl->start_addr = pentry; 146 } 147 148 if (ipl->initrd) { 149 ram_addr_t initrd_offset; 150 int initrd_size; 151 152 initrd_offset = INITRD_START; 153 while (kernel_size + 0x100000 > initrd_offset) { 154 initrd_offset += 0x100000; 155 } 156 initrd_size = load_image_targphys(ipl->initrd, initrd_offset, 157 ram_size - initrd_offset); 158 if (initrd_size == -1) { 159 error_setg(&l_err, "could not load initrd '%s'\n", ipl->initrd); 160 goto error; 161 } 162 163 /* 164 * we have to overwrite values in the kernel image, 165 * which are "rom" 166 */ 167 stq_p(rom_ptr(INITRD_PARM_START), initrd_offset); 168 stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size); 169 } 170 } 171 qemu_register_reset(qdev_reset_all_fn, dev); 172 error: 173 error_propagate(errp, l_err); 174 } 175 176 static Property s390_ipl_properties[] = { 177 DEFINE_PROP_STRING("kernel", S390IPLState, kernel), 178 DEFINE_PROP_STRING("initrd", S390IPLState, initrd), 179 DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline), 180 DEFINE_PROP_STRING("firmware", S390IPLState, firmware), 181 DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false), 182 DEFINE_PROP_END_OF_LIST(), 183 }; 184 185 /* 186 * In addition to updating the iplstate, this function returns: 187 * - 0 if system was ipled with external kernel 188 * - -1 if no valid boot device was found 189 * - ccw id of the boot device otherwise 190 */ 191 static uint64_t s390_update_iplstate(S390IPLState *ipl) 192 { 193 DeviceState *dev_st; 194 195 if (ipl->iplb_valid) { 196 ipl->cssid = 0; 197 ipl->ssid = 0; 198 ipl->devno = ipl->iplb.devno; 199 goto out; 200 } 201 202 if (ipl->kernel) { 203 return 0; 204 } 205 206 dev_st = get_boot_device(0); 207 if (dev_st) { 208 VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast( 209 OBJECT(qdev_get_parent_bus(dev_st)->parent), 210 TYPE_VIRTIO_CCW_DEVICE); 211 if (ccw_dev) { 212 ipl->cssid = ccw_dev->sch->cssid; 213 ipl->ssid = ccw_dev->sch->ssid; 214 ipl->devno = ccw_dev->sch->devno; 215 goto out; 216 } 217 } 218 219 return -1; 220 out: 221 return (uint32_t) (ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno); 222 } 223 224 void s390_ipl_update_diag308(IplParameterBlock *iplb) 225 { 226 S390IPLState *ipl = get_ipl_device(); 227 228 ipl->iplb = *iplb; 229 ipl->iplb_valid = true; 230 } 231 232 IplParameterBlock *s390_ipl_get_iplb(void) 233 { 234 S390IPLState *ipl = get_ipl_device(); 235 236 if (!ipl->iplb_valid) { 237 return NULL; 238 } 239 return &ipl->iplb; 240 } 241 242 void s390_reipl_request(void) 243 { 244 S390IPLState *ipl = get_ipl_device(); 245 246 ipl->reipl_requested = true; 247 qemu_system_reset_request(); 248 } 249 250 void s390_ipl_prepare_cpu(S390CPU *cpu) 251 { 252 S390IPLState *ipl = get_ipl_device(); 253 254 cpu->env.psw.addr = ipl->start_addr; 255 cpu->env.psw.mask = IPL_PSW_MASK; 256 257 if (!ipl->kernel || ipl->iplb_valid) { 258 cpu->env.psw.addr = ipl->bios_start_addr; 259 cpu->env.regs[7] = s390_update_iplstate(ipl); 260 } 261 } 262 263 static void s390_ipl_reset(DeviceState *dev) 264 { 265 S390IPLState *ipl = S390_IPL(dev); 266 267 if (!ipl->reipl_requested) { 268 ipl->iplb_valid = false; 269 } 270 ipl->reipl_requested = false; 271 } 272 273 static void s390_ipl_class_init(ObjectClass *klass, void *data) 274 { 275 DeviceClass *dc = DEVICE_CLASS(klass); 276 277 dc->realize = s390_ipl_realize; 278 dc->props = s390_ipl_properties; 279 dc->reset = s390_ipl_reset; 280 dc->vmsd = &vmstate_ipl; 281 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 282 } 283 284 static const TypeInfo s390_ipl_info = { 285 .class_init = s390_ipl_class_init, 286 .parent = TYPE_DEVICE, 287 .name = TYPE_S390_IPL, 288 .instance_size = sizeof(S390IPLState), 289 }; 290 291 static void s390_ipl_register_types(void) 292 { 293 type_register_static(&s390_ipl_info); 294 } 295 296 type_init(s390_ipl_register_types) 297