hw/s390x/ipl.c

   1 /*
   2  * bootloader support
   3  *
   4  * Copyright IBM, Corp. 2012
   5  *
   6  * Authors:
   7  *  Christian Borntraeger <[email protected]>
   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/sysbus.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 #define TYPE_S390_IPL "s390-ipl"
  33 #define S390_IPL(obj) \
  34     OBJECT_CHECK(S390IPLState, (obj), TYPE_S390_IPL)
  35 #if 0
  36 #define S390_IPL_CLASS(klass) \
  37     OBJECT_CLASS_CHECK(S390IPLState, (klass), TYPE_S390_IPL)
  38 #define S390_IPL_GET_CLASS(obj) \
  39     OBJECT_GET_CLASS(S390IPLState, (obj), TYPE_S390_IPL)
  40 #endif
  41
  42 typedef struct S390IPLClass {
  43     /*< private >*/
  44     SysBusDeviceClass parent_class;
  45     /*< public >*/
  46
  47     void (*parent_reset) (SysBusDevice *dev);
  48 } S390IPLClass;
  49
  50 typedef struct S390IPLState {
  51     /*< private >*/
  52     SysBusDevice parent_obj;
  53     uint64_t start_addr;
  54     uint64_t bios_start_addr;
  55     bool enforce_bios;
  56     IplParameterBlock iplb;
  57     bool iplb_valid;
  58     bool reipl_requested;
  59
  60     /*< public >*/
  61     char *kernel;
  62     char *initrd;
  63     char *cmdline;
  64     char *firmware;
  65     uint8_t cssid;
  66     uint8_t ssid;
  67     uint16_t devno;
  68 } S390IPLState;
  69
  70 static const VMStateDescription vmstate_iplb = {
  71     .name = "ipl/iplb",
  72     .version_id = 0,
  73     .minimum_version_id = 0,
  74     .fields = (VMStateField[]) {
  75         VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110),
  76         VMSTATE_UINT16(devno, IplParameterBlock),
  77         VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88),
  78         VMSTATE_END_OF_LIST()
  79     }
  80 };
  81
  82 static const VMStateDescription vmstate_ipl = {
  83     .name = "ipl",
  84     .version_id = 0,
  85     .minimum_version_id = 0,
  86     .fields = (VMStateField[]) {
  87         VMSTATE_UINT64(start_addr, S390IPLState),
  88         VMSTATE_UINT64(bios_start_addr, S390IPLState),
  89         VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock),
  90         VMSTATE_BOOL(iplb_valid, S390IPLState),
  91         VMSTATE_UINT8(cssid, S390IPLState),
  92         VMSTATE_UINT8(ssid, S390IPLState),
  93         VMSTATE_UINT16(devno, S390IPLState),
  94         VMSTATE_END_OF_LIST()
  95      }
  96 };
  97
  98 static int s390_ipl_init(SysBusDevice *dev)
  99 {
 100     S390IPLState *ipl = S390_IPL(dev);
 101     uint64_t pentry = KERN_IMAGE_START;
 102     int kernel_size;
 103
 104     int bios_size;
 105     char *bios_filename;
 106
 107     /*
 108      * Always load the bios if it was enforced,
 109      * even if an external kernel has been defined.
 110      */
 111     if (!ipl->kernel || ipl->enforce_bios) {
 112         if (bios_name == NULL) {
 113             bios_name = ipl->firmware;
 114         }
 115
 116         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 117         if (bios_filename == NULL) {
 118             hw_error("could not find stage1 bootloader\n");
 119         }
 120
 121         bios_size = load_elf(bios_filename, NULL, NULL, &ipl->bios_start_addr,
 122                              NULL, NULL, 1, ELF_MACHINE, 0);
 123         if (bios_size < 0) {
 124             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
 125                                             4096);
 126             ipl->bios_start_addr = ZIPL_IMAGE_START;
 127             if (bios_size > 4096) {
 128                 hw_error("stage1 bootloader is > 4k\n");
 129             }
 130         }
 131         g_free(bios_filename);
 132
 133         if (bios_size == -1) {
 134             hw_error("could not load bootloader '%s'\n", bios_name);
 135         }
 136
 137         /* default boot target is the bios */
 138         ipl->start_addr = ipl->bios_start_addr;
 139     }
 140
 141     if (ipl->kernel) {
 142         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 143                                NULL, 1, ELF_MACHINE, 0);
 144         if (kernel_size < 0) {
 145             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 146         }
 147         if (kernel_size < 0) {
 148             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 149             return -1;
 150         }
 151         /*
 152          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 153          * kernel parameters here as well. Note: For old kernels (up to 3.2)
 154          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 155          * loader) and it won't work. For this case we force it to 0x10000, too.
 156          */
 157         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 158             ipl->start_addr = KERN_IMAGE_START;
 159             /* Overwrite parameters in the kernel image, which are "rom" */
 160             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 161         } else {
 162             ipl->start_addr = pentry;
 163         }
 164
 165         if (ipl->initrd) {
 166             ram_addr_t initrd_offset;
 167             int initrd_size;
 168
 169             initrd_offset = INITRD_START;
 170             while (kernel_size + 0x100000 > initrd_offset) {
 171                 initrd_offset += 0x100000;
 172             }
 173             initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 174                                               ram_size - initrd_offset);
 175             if (initrd_size == -1) {
 176                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 177                         ipl->initrd);
 178                 exit(1);
 179             }
 180
 181             /*
 182              * we have to overwrite values in the kernel image,
 183              * which are "rom"
 184              */
 185             stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 186             stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 187         }
 188     }
 189     return 0;
 190 }
 191
 192 static Property s390_ipl_properties[] = {
 193     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 194     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 195     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 196     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 197     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
 198     DEFINE_PROP_END_OF_LIST(),
 199 };
 200
 201 /*
 202  * In addition to updating the iplstate, this function returns:
 203  * - 0 if system was ipled with external kernel
 204  * - -1 if no valid boot device was found
 205  * - ccw id of the boot device otherwise
 206  */
 207 static uint64_t s390_update_iplstate(CPUS390XState *env, S390IPLState *ipl)
 208 {
 209     DeviceState *dev_st;
 210
 211     if (ipl->iplb_valid) {
 212         ipl->cssid = 0;
 213         ipl->ssid = 0;
 214         ipl->devno = ipl->iplb.devno;
 215         goto out;
 216     }
 217
 218     if (ipl->kernel) {
 219         return 0;
 220     }
 221
 222     dev_st = get_boot_device(0);
 223     if (dev_st) {
 224         VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 225             OBJECT(qdev_get_parent_bus(dev_st)->parent),
 226                 TYPE_VIRTIO_CCW_DEVICE);
 227         if (ccw_dev) {
 228             ipl->cssid = ccw_dev->sch->cssid;
 229             ipl->ssid = ccw_dev->sch->ssid;
 230             ipl->devno = ccw_dev->sch->devno;
 231             goto out;
 232         }
 233     }
 234
 235     return -1;
 236 out:
 237     return ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno;
 238 }
 239
 240 int s390_ipl_update_diag308(IplParameterBlock *iplb)
 241 {
 242     S390IPLState *ipl;
 243
 244     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 245     if (ipl) {
 246         ipl->iplb = *iplb;
 247         ipl->iplb_valid = true;
 248         return 0;
 249     }
 250     return -1;
 251 }
 252
 253 IplParameterBlock *s390_ipl_get_iplb(void)
 254 {
 255     S390IPLState *ipl;
 256
 257     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 258     if (!ipl || !ipl->iplb_valid) {
 259         return NULL;
 260     }
 261     return &ipl->iplb;
 262 }
 263
 264 void s390_reipl_request(void)
 265 {
 266     S390IPLState *ipl;
 267
 268     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 269     ipl->reipl_requested = true;
 270     qemu_system_reset_request();
 271 }
 272
 273 static void s390_ipl_reset(DeviceState *dev)
 274 {
 275     S390IPLState *ipl = S390_IPL(dev);
 276     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
 277     CPUS390XState *env = &cpu->env;
 278
 279     env->psw.addr = ipl->start_addr;
 280     env->psw.mask = IPL_PSW_MASK;
 281
 282     if (!ipl->reipl_requested) {
 283         ipl->iplb_valid = false;
 284     }
 285     ipl->reipl_requested = false;
 286
 287     if (!ipl->kernel || ipl->iplb_valid) {
 288         env->psw.addr = ipl->bios_start_addr;
 289         env->regs[7] = s390_update_iplstate(env, ipl);
 290     }
 291
 292     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
 293 }
 294
 295 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 296 {
 297     DeviceClass *dc = DEVICE_CLASS(klass);
 298     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 299
 300     k->init = s390_ipl_init;
 301     dc->props = s390_ipl_properties;
 302     dc->reset = s390_ipl_reset;
 303     dc->vmsd = &vmstate_ipl;
 304 }
 305
 306 static const TypeInfo s390_ipl_info = {
 307     .class_init = s390_ipl_class_init,
 308     .parent = TYPE_SYS_BUS_DEVICE,
 309     .name  = "s390-ipl",
 310     .instance_size  = sizeof(S390IPLState),
 311 };
 312
 313 static void s390_ipl_register_types(void)
 314 {
 315     type_register_static(&s390_ipl_info);
 316 }
 317
 318 type_init(s390_ipl_register_types)