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 "sysemu/sysemu.h"
  15 #include "cpu.h"
  16 #include "elf.h"
  17 #include "exec/ram_addr.h"
  18 #include "hw/loader.h"
  19 #include "hw/sysbus.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 #define TYPE_S390_IPL "s390-ipl"
  34 #define S390_IPL(obj) \
  35     OBJECT_CHECK(S390IPLState, (obj), TYPE_S390_IPL)
  36 #if 0
  37 #define S390_IPL_CLASS(klass) \
  38     OBJECT_CLASS_CHECK(S390IPLState, (klass), TYPE_S390_IPL)
  39 #define S390_IPL_GET_CLASS(obj) \
  40     OBJECT_GET_CLASS(S390IPLState, (obj), TYPE_S390_IPL)
  41 #endif
  42
  43 typedef struct S390IPLClass {
  44     /*< private >*/
  45     SysBusDeviceClass parent_class;
  46     /*< public >*/
  47
  48     void (*parent_reset) (SysBusDevice *dev);
  49 } S390IPLClass;
  50
  51 typedef struct S390IPLState {
  52     /*< private >*/
  53     SysBusDevice parent_obj;
  54     uint64_t start_addr;
  55     uint64_t bios_start_addr;
  56     bool enforce_bios;
  57     IplParameterBlock iplb;
  58     bool iplb_valid;
  59     bool reipl_requested;
  60
  61     /*< public >*/
  62     char *kernel;
  63     char *initrd;
  64     char *cmdline;
  65     char *firmware;
  66     uint8_t cssid;
  67     uint8_t ssid;
  68     uint16_t devno;
  69 } S390IPLState;
  70
  71 static const VMStateDescription vmstate_iplb = {
  72     .name = "ipl/iplb",
  73     .version_id = 0,
  74     .minimum_version_id = 0,
  75     .fields = (VMStateField[]) {
  76         VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110),
  77         VMSTATE_UINT16(devno, IplParameterBlock),
  78         VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88),
  79         VMSTATE_END_OF_LIST()
  80     }
  81 };
  82
  83 static const VMStateDescription vmstate_ipl = {
  84     .name = "ipl",
  85     .version_id = 0,
  86     .minimum_version_id = 0,
  87     .fields = (VMStateField[]) {
  88         VMSTATE_UINT64(start_addr, S390IPLState),
  89         VMSTATE_UINT64(bios_start_addr, S390IPLState),
  90         VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock),
  91         VMSTATE_BOOL(iplb_valid, S390IPLState),
  92         VMSTATE_UINT8(cssid, S390IPLState),
  93         VMSTATE_UINT8(ssid, S390IPLState),
  94         VMSTATE_UINT16(devno, S390IPLState),
  95         VMSTATE_END_OF_LIST()
  96      }
  97 };
  98
  99 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
 100 {
 101     uint64_t dstaddr = *(uint64_t *) opaque;
 102     /*
 103      * Assuming that our s390-ccw.img was linked for starting at address 0,
 104      * we can simply add the destination address for the final location
 105      */
 106     return srcaddr + dstaddr;
 107 }
 108
 109 static int s390_ipl_init(SysBusDevice *dev)
 110 {
 111     S390IPLState *ipl = S390_IPL(dev);
 112     uint64_t pentry = KERN_IMAGE_START;
 113     int kernel_size;
 114
 115     int bios_size;
 116     char *bios_filename;
 117
 118     /*
 119      * Always load the bios if it was enforced,
 120      * even if an external kernel has been defined.
 121      */
 122     if (!ipl->kernel || ipl->enforce_bios) {
 123         uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL;
 124
 125         if (bios_name == NULL) {
 126             bios_name = ipl->firmware;
 127         }
 128
 129         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 130         if (bios_filename == NULL) {
 131             hw_error("could not find stage1 bootloader\n");
 132         }
 133
 134         bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase,
 135                              &ipl->bios_start_addr, NULL, NULL, 1,
 136                              ELF_MACHINE, 0);
 137         if (bios_size > 0) {
 138             /* Adjust ELF start address to final location */
 139             ipl->bios_start_addr += fwbase;
 140         } else {
 141             /* Try to load non-ELF file (e.g. s390-zipl.rom) */
 142             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
 143                                             4096);
 144             ipl->bios_start_addr = ZIPL_IMAGE_START;
 145             if (bios_size > 4096) {
 146                 hw_error("stage1 bootloader is > 4k\n");
 147             }
 148         }
 149         g_free(bios_filename);
 150
 151         if (bios_size == -1) {
 152             hw_error("could not load bootloader '%s'\n", bios_name);
 153         }
 154
 155         /* default boot target is the bios */
 156         ipl->start_addr = ipl->bios_start_addr;
 157     }
 158
 159     if (ipl->kernel) {
 160         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 161                                NULL, 1, ELF_MACHINE, 0);
 162         if (kernel_size < 0) {
 163             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 164         }
 165         if (kernel_size < 0) {
 166             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 167             return -1;
 168         }
 169         /*
 170          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 171          * kernel parameters here as well. Note: For old kernels (up to 3.2)
 172          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 173          * loader) and it won't work. For this case we force it to 0x10000, too.
 174          */
 175         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 176             ipl->start_addr = KERN_IMAGE_START;
 177             /* Overwrite parameters in the kernel image, which are "rom" */
 178             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 179         } else {
 180             ipl->start_addr = pentry;
 181         }
 182
 183         if (ipl->initrd) {
 184             ram_addr_t initrd_offset;
 185             int initrd_size;
 186
 187             initrd_offset = INITRD_START;
 188             while (kernel_size + 0x100000 > initrd_offset) {
 189                 initrd_offset += 0x100000;
 190             }
 191             initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 192                                               ram_size - initrd_offset);
 193             if (initrd_size == -1) {
 194                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 195                         ipl->initrd);
 196                 exit(1);
 197             }
 198
 199             /*
 200              * we have to overwrite values in the kernel image,
 201              * which are "rom"
 202              */
 203             stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 204             stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 205         }
 206     }
 207     return 0;
 208 }
 209
 210 static Property s390_ipl_properties[] = {
 211     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 212     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 213     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 214     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 215     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
 216     DEFINE_PROP_END_OF_LIST(),
 217 };
 218
 219 /*
 220  * In addition to updating the iplstate, this function returns:
 221  * - 0 if system was ipled with external kernel
 222  * - -1 if no valid boot device was found
 223  * - ccw id of the boot device otherwise
 224  */
 225 static uint64_t s390_update_iplstate(CPUS390XState *env, S390IPLState *ipl)
 226 {
 227     DeviceState *dev_st;
 228
 229     if (ipl->iplb_valid) {
 230         ipl->cssid = 0;
 231         ipl->ssid = 0;
 232         ipl->devno = ipl->iplb.devno;
 233         goto out;
 234     }
 235
 236     if (ipl->kernel) {
 237         return 0;
 238     }
 239
 240     dev_st = get_boot_device(0);
 241     if (dev_st) {
 242         VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 243             OBJECT(qdev_get_parent_bus(dev_st)->parent),
 244                 TYPE_VIRTIO_CCW_DEVICE);
 245         if (ccw_dev) {
 246             ipl->cssid = ccw_dev->sch->cssid;
 247             ipl->ssid = ccw_dev->sch->ssid;
 248             ipl->devno = ccw_dev->sch->devno;
 249             goto out;
 250         }
 251     }
 252
 253     return -1;
 254 out:
 255     return ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno;
 256 }
 257
 258 int s390_ipl_update_diag308(IplParameterBlock *iplb)
 259 {
 260     S390IPLState *ipl;
 261
 262     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 263     if (ipl) {
 264         ipl->iplb = *iplb;
 265         ipl->iplb_valid = true;
 266         return 0;
 267     }
 268     return -1;
 269 }
 270
 271 IplParameterBlock *s390_ipl_get_iplb(void)
 272 {
 273     S390IPLState *ipl;
 274
 275     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 276     if (!ipl || !ipl->iplb_valid) {
 277         return NULL;
 278     }
 279     return &ipl->iplb;
 280 }
 281
 282 void s390_reipl_request(void)
 283 {
 284     S390IPLState *ipl;
 285
 286     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 287     ipl->reipl_requested = true;
 288     qemu_system_reset_request();
 289 }
 290
 291 static void s390_ipl_reset(DeviceState *dev)
 292 {
 293     S390IPLState *ipl = S390_IPL(dev);
 294     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
 295     CPUS390XState *env = &cpu->env;
 296
 297     env->psw.addr = ipl->start_addr;
 298     env->psw.mask = IPL_PSW_MASK;
 299
 300     if (!ipl->reipl_requested) {
 301         ipl->iplb_valid = false;
 302     }
 303     ipl->reipl_requested = false;
 304
 305     if (!ipl->kernel || ipl->iplb_valid) {
 306         env->psw.addr = ipl->bios_start_addr;
 307         env->regs[7] = s390_update_iplstate(env, ipl);
 308     }
 309
 310     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
 311 }
 312
 313 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 314 {
 315     DeviceClass *dc = DEVICE_CLASS(klass);
 316     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 317
 318     k->init = s390_ipl_init;
 319     dc->props = s390_ipl_properties;
 320     dc->reset = s390_ipl_reset;
 321     dc->vmsd = &vmstate_ipl;
 322 }
 323
 324 static const TypeInfo s390_ipl_info = {
 325     .class_init = s390_ipl_class_init,
 326     .parent = TYPE_SYS_BUS_DEVICE,
 327     .name  = "s390-ipl",
 328     .instance_size  = sizeof(S390IPLState),
 329 };
 330
 331 static void s390_ipl_register_types(void)
 332 {
 333     type_register_static(&s390_ipl_info);
 334 }
 335
 336 type_init(s390_ipl_register_types)