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/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 *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(&err, "could not find stage1 bootloader");
  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(&err, "could not load bootloader '%s'", 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(&err, "could not load kernel '%s'", 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(&err, "could not load initrd '%s'", 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, 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)