hw/s390x/ipl.c

   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 bool iplb_extended_needed(void *opaque)
  34 {
  35     S390IPLState *ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
  36
  37     return ipl->iplbext_migration;
  38 }
  39
  40 static const VMStateDescription vmstate_iplb_extended = {
  41     .name = "ipl/iplb_extended",
  42     .version_id = 0,
  43     .minimum_version_id = 0,
  44     .needed = iplb_extended_needed,
  45     .fields = (VMStateField[]) {
  46         VMSTATE_UINT8_ARRAY(reserved_ext, IplParameterBlock, 4096 - 200),
  47         VMSTATE_END_OF_LIST()
  48     }
  49 };
  50
  51 static const VMStateDescription vmstate_iplb = {
  52     .name = "ipl/iplb",
  53     .version_id = 0,
  54     .minimum_version_id = 0,
  55     .fields = (VMStateField[]) {
  56         VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110),
  57         VMSTATE_UINT16(devno, IplParameterBlock),
  58         VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88),
  59         VMSTATE_END_OF_LIST()
  60     },
  61     .subsections = (const VMStateDescription*[]) {
  62         &vmstate_iplb_extended,
  63         NULL
  64     }
  65 };
  66
  67 static const VMStateDescription vmstate_ipl = {
  68     .name = "ipl",
  69     .version_id = 0,
  70     .minimum_version_id = 0,
  71     .fields = (VMStateField[]) {
  72         VMSTATE_UINT64(start_addr, S390IPLState),
  73         VMSTATE_UINT64(bios_start_addr, S390IPLState),
  74         VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock),
  75         VMSTATE_BOOL(iplb_valid, S390IPLState),
  76         VMSTATE_UINT8(cssid, S390IPLState),
  77         VMSTATE_UINT8(ssid, S390IPLState),
  78         VMSTATE_UINT16(devno, S390IPLState),
  79         VMSTATE_END_OF_LIST()
  80      }
  81 };
  82
  83 static S390IPLState *get_ipl_device(void)
  84 {
  85     return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL));
  86 }
  87
  88 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
  89 {
  90     uint64_t dstaddr = *(uint64_t *) opaque;
  91     /*
  92      * Assuming that our s390-ccw.img was linked for starting at address 0,
  93      * we can simply add the destination address for the final location
  94      */
  95     return srcaddr + dstaddr;
  96 }
  97
  98 static void s390_ipl_realize(DeviceState *dev, Error **errp)
  99 {
 100     S390IPLState *ipl = S390_IPL(dev);
 101     uint64_t pentry = KERN_IMAGE_START;
 102     int kernel_size;
 103     Error *err = NULL;
 104
 105     int bios_size;
 106     char *bios_filename;
 107
 108     /*
 109      * Always load the bios if it was enforced,
 110      * even if an external kernel has been defined.
 111      */
 112     if (!ipl->kernel || ipl->enforce_bios) {
 113         uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL;
 114
 115         if (bios_name == NULL) {
 116             bios_name = ipl->firmware;
 117         }
 118
 119         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 120         if (bios_filename == NULL) {
 121             error_setg(&err, "could not find stage1 bootloader");
 122             goto error;
 123         }
 124
 125         bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase,
 126                              &ipl->bios_start_addr, NULL, NULL, 1,
 127                              EM_S390, 0, 0);
 128         if (bios_size > 0) {
 129             /* Adjust ELF start address to final location */
 130             ipl->bios_start_addr += fwbase;
 131         } else {
 132             /* Try to load non-ELF file */
 133             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
 134                                             4096);
 135             ipl->bios_start_addr = ZIPL_IMAGE_START;
 136         }
 137         g_free(bios_filename);
 138
 139         if (bios_size == -1) {
 140             error_setg(&err, "could not load bootloader '%s'", bios_name);
 141             goto error;
 142         }
 143
 144         /* default boot target is the bios */
 145         ipl->start_addr = ipl->bios_start_addr;
 146     }
 147
 148     if (ipl->kernel) {
 149         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 150                                NULL, 1, EM_S390, 0, 0);
 151         if (kernel_size < 0) {
 152             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 153         }
 154         if (kernel_size < 0) {
 155             error_setg(&err, "could not load kernel '%s'", ipl->kernel);
 156             goto error;
 157         }
 158         /*
 159          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 160          * kernel parameters here as well. Note: For old kernels (up to 3.2)
 161          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 162          * loader) and it won't work. For this case we force it to 0x10000, too.
 163          */
 164         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 165             ipl->start_addr = KERN_IMAGE_START;
 166             /* Overwrite parameters in the kernel image, which are "rom" */
 167             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 168         } else {
 169             ipl->start_addr = pentry;
 170         }
 171
 172         if (ipl->initrd) {
 173             ram_addr_t initrd_offset;
 174             int initrd_size;
 175
 176             initrd_offset = INITRD_START;
 177             while (kernel_size + 0x100000 > initrd_offset) {
 178                 initrd_offset += 0x100000;
 179             }
 180             initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 181                                               ram_size - initrd_offset);
 182             if (initrd_size == -1) {
 183                 error_setg(&err, "could not load initrd '%s'", ipl->initrd);
 184                 goto error;
 185             }
 186
 187             /*
 188              * we have to overwrite values in the kernel image,
 189              * which are "rom"
 190              */
 191             stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 192             stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 193         }
 194     }
 195     qemu_register_reset(qdev_reset_all_fn, dev);
 196 error:
 197     error_propagate(errp, err);
 198 }
 199
 200 static Property s390_ipl_properties[] = {
 201     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 202     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 203     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 204     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 205     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
 206     DEFINE_PROP_BOOL("iplbext_migration", S390IPLState, iplbext_migration,
 207                      true),
 208     DEFINE_PROP_END_OF_LIST(),
 209 };
 210
 211 static bool s390_gen_initial_iplb(S390IPLState *ipl)
 212 {
 213     DeviceState *dev_st;
 214
 215     dev_st = get_boot_device(0);
 216     if (dev_st) {
 217         VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 218             OBJECT(qdev_get_parent_bus(dev_st)->parent),
 219                 TYPE_VIRTIO_CCW_DEVICE);
 220         if (ccw_dev) {
 221             ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_CCW_LEN);
 222             ipl->iplb.blk0_len =
 223                 cpu_to_be32(S390_IPLB_MIN_CCW_LEN - S390_IPLB_HEADER_LEN);
 224             ipl->iplb.pbt = S390_IPL_TYPE_CCW;
 225             ipl->iplb.ccw.devno = cpu_to_be16(ccw_dev->sch->devno);
 226             ipl->iplb.ccw.ssid = ccw_dev->sch->ssid & 3;
 227             return true;
 228         }
 229     }
 230
 231     return false;
 232 }
 233
 234 void s390_ipl_update_diag308(IplParameterBlock *iplb)
 235 {
 236     S390IPLState *ipl = get_ipl_device();
 237
 238     ipl->iplb = *iplb;
 239     ipl->iplb_valid = true;
 240 }
 241
 242 IplParameterBlock *s390_ipl_get_iplb(void)
 243 {
 244     S390IPLState *ipl = get_ipl_device();
 245
 246     if (!ipl->iplb_valid) {
 247         return NULL;
 248     }
 249     return &ipl->iplb;
 250 }
 251
 252 void s390_reipl_request(void)
 253 {
 254     S390IPLState *ipl = get_ipl_device();
 255
 256     ipl->reipl_requested = true;
 257     qemu_system_reset_request();
 258 }
 259
 260 void s390_ipl_prepare_cpu(S390CPU *cpu)
 261 {
 262     S390IPLState *ipl = get_ipl_device();
 263
 264     cpu->env.psw.addr = ipl->start_addr;
 265     cpu->env.psw.mask = IPL_PSW_MASK;
 266
 267     if (!ipl->kernel || ipl->iplb_valid) {
 268         cpu->env.psw.addr = ipl->bios_start_addr;
 269         if (!ipl->iplb_valid) {
 270             ipl->iplb_valid = s390_gen_initial_iplb(ipl);
 271         }
 272     }
 273 }
 274
 275 static void s390_ipl_reset(DeviceState *dev)
 276 {
 277     S390IPLState *ipl = S390_IPL(dev);
 278
 279     if (!ipl->reipl_requested) {
 280         ipl->iplb_valid = false;
 281         memset(&ipl->iplb, 0, sizeof(IplParameterBlock));
 282     }
 283     ipl->reipl_requested = false;
 284 }
 285
 286 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 287 {
 288     DeviceClass *dc = DEVICE_CLASS(klass);
 289
 290     dc->realize = s390_ipl_realize;
 291     dc->props = s390_ipl_properties;
 292     dc->reset = s390_ipl_reset;
 293     dc->vmsd = &vmstate_ipl;
 294     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 295 }
 296
 297 static const TypeInfo s390_ipl_info = {
 298     .class_init = s390_ipl_class_init,
 299     .parent = TYPE_DEVICE,
 300     .name  = TYPE_S390_IPL,
 301     .instance_size  = sizeof(S390IPLState),
 302 };
 303
 304 static void s390_ipl_register_types(void)
 305 {
 306     type_register_static(&s390_ipl_info);
 307 }
 308
 309 type_init(s390_ipl_register_types)