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 "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 S390IPLState *get_ipl_device(void)
  99 {
 100     return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL));
 101 }
 102
 103 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
 104 {
 105     uint64_t dstaddr = *(uint64_t *) opaque;
 106     /*
 107      * Assuming that our s390-ccw.img was linked for starting at address 0,
 108      * we can simply add the destination address for the final location
 109      */
 110     return srcaddr + dstaddr;
 111 }
 112
 113 static int s390_ipl_init(SysBusDevice *dev)
 114 {
 115     S390IPLState *ipl = S390_IPL(dev);
 116     uint64_t pentry = KERN_IMAGE_START;
 117     int kernel_size;
 118
 119     int bios_size;
 120     char *bios_filename;
 121
 122     /*
 123      * Always load the bios if it was enforced,
 124      * even if an external kernel has been defined.
 125      */
 126     if (!ipl->kernel || ipl->enforce_bios) {
 127         uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL;
 128
 129         if (bios_name == NULL) {
 130             bios_name = ipl->firmware;
 131         }
 132
 133         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 134         if (bios_filename == NULL) {
 135             hw_error("could not find stage1 bootloader\n");
 136         }
 137
 138         bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase,
 139                              &ipl->bios_start_addr, NULL, NULL, 1,
 140                              EM_S390, 0);
 141         if (bios_size > 0) {
 142             /* Adjust ELF start address to final location */
 143             ipl->bios_start_addr += fwbase;
 144         } else {
 145             /* Try to load non-ELF file (e.g. s390-zipl.rom) */
 146             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
 147                                             4096);
 148             ipl->bios_start_addr = ZIPL_IMAGE_START;
 149         }
 150         g_free(bios_filename);
 151
 152         if (bios_size == -1) {
 153             hw_error("could not load bootloader '%s'\n", bios_name);
 154         }
 155
 156         /* default boot target is the bios */
 157         ipl->start_addr = ipl->bios_start_addr;
 158     }
 159
 160     if (ipl->kernel) {
 161         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 162                                NULL, 1, EM_S390, 0);
 163         if (kernel_size < 0) {
 164             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 165         }
 166         if (kernel_size < 0) {
 167             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 168             return -1;
 169         }
 170         /*
 171          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 172          * kernel parameters here as well. Note: For old kernels (up to 3.2)
 173          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 174          * loader) and it won't work. For this case we force it to 0x10000, too.
 175          */
 176         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 177             ipl->start_addr = KERN_IMAGE_START;
 178             /* Overwrite parameters in the kernel image, which are "rom" */
 179             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 180         } else {
 181             ipl->start_addr = pentry;
 182         }
 183
 184         if (ipl->initrd) {
 185             ram_addr_t initrd_offset;
 186             int initrd_size;
 187
 188             initrd_offset = INITRD_START;
 189             while (kernel_size + 0x100000 > initrd_offset) {
 190                 initrd_offset += 0x100000;
 191             }
 192             initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 193                                               ram_size - initrd_offset);
 194             if (initrd_size == -1) {
 195                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 196                         ipl->initrd);
 197                 exit(1);
 198             }
 199
 200             /*
 201              * we have to overwrite values in the kernel image,
 202              * which are "rom"
 203              */
 204             stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 205             stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 206         }
 207     }
 208     return 0;
 209 }
 210
 211 static Property s390_ipl_properties[] = {
 212     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 213     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 214     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 215     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 216     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
 217     DEFINE_PROP_END_OF_LIST(),
 218 };
 219
 220 /*
 221  * In addition to updating the iplstate, this function returns:
 222  * - 0 if system was ipled with external kernel
 223  * - -1 if no valid boot device was found
 224  * - ccw id of the boot device otherwise
 225  */
 226 static uint64_t s390_update_iplstate(S390IPLState *ipl)
 227 {
 228     DeviceState *dev_st;
 229
 230     if (ipl->iplb_valid) {
 231         ipl->cssid = 0;
 232         ipl->ssid = 0;
 233         ipl->devno = ipl->iplb.devno;
 234         goto out;
 235     }
 236
 237     if (ipl->kernel) {
 238         return 0;
 239     }
 240
 241     dev_st = get_boot_device(0);
 242     if (dev_st) {
 243         VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 244             OBJECT(qdev_get_parent_bus(dev_st)->parent),
 245                 TYPE_VIRTIO_CCW_DEVICE);
 246         if (ccw_dev) {
 247             ipl->cssid = ccw_dev->sch->cssid;
 248             ipl->ssid = ccw_dev->sch->ssid;
 249             ipl->devno = ccw_dev->sch->devno;
 250             goto out;
 251         }
 252     }
 253
 254     return -1;
 255 out:
 256     return (uint32_t) (ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno);
 257 }
 258
 259 void s390_ipl_update_diag308(IplParameterBlock *iplb)
 260 {
 261     S390IPLState *ipl = get_ipl_device();
 262
 263     ipl->iplb = *iplb;
 264     ipl->iplb_valid = true;
 265 }
 266
 267 IplParameterBlock *s390_ipl_get_iplb(void)
 268 {
 269     S390IPLState *ipl = get_ipl_device();
 270
 271     if (!ipl->iplb_valid) {
 272         return NULL;
 273     }
 274     return &ipl->iplb;
 275 }
 276
 277 void s390_reipl_request(void)
 278 {
 279     S390IPLState *ipl = get_ipl_device();
 280
 281     ipl->reipl_requested = true;
 282     qemu_system_reset_request();
 283 }
 284
 285 void s390_ipl_prepare_cpu(S390CPU *cpu)
 286 {
 287     S390IPLState *ipl = get_ipl_device();
 288
 289     cpu->env.psw.addr = ipl->start_addr;
 290     cpu->env.psw.mask = IPL_PSW_MASK;
 291
 292     if (!ipl->kernel || ipl->iplb_valid) {
 293         cpu->env.psw.addr = ipl->bios_start_addr;
 294         cpu->env.regs[7] = s390_update_iplstate(ipl);
 295     }
 296 }
 297
 298 static void s390_ipl_reset(DeviceState *dev)
 299 {
 300     S390IPLState *ipl = S390_IPL(dev);
 301
 302     if (!ipl->reipl_requested) {
 303         ipl->iplb_valid = false;
 304     }
 305     ipl->reipl_requested = false;
 306 }
 307
 308 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 309 {
 310     DeviceClass *dc = DEVICE_CLASS(klass);
 311     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 312
 313     k->init = s390_ipl_init;
 314     dc->props = s390_ipl_properties;
 315     dc->reset = s390_ipl_reset;
 316     dc->vmsd = &vmstate_ipl;
 317     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 318 }
 319
 320 static const TypeInfo s390_ipl_info = {
 321     .class_init = s390_ipl_class_init,
 322     .parent = TYPE_SYS_BUS_DEVICE,
 323     .name  = "s390-ipl",
 324     .instance_size  = sizeof(S390IPLState),
 325 };
 326
 327 static void s390_ipl_register_types(void)
 328 {
 329     type_register_static(&s390_ipl_info);
 330 }
 331
 332 type_init(s390_ipl_register_types)