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 "sysemu/sysemu.h"
  16 #include "cpu.h"
  17 #include "elf.h"
  18 #include "hw/loader.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 static const VMStateDescription vmstate_iplb = {
  33     .name = "ipl/iplb",
  34     .version_id = 0,
  35     .minimum_version_id = 0,
  36     .fields = (VMStateField[]) {
  37         VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110),
  38         VMSTATE_UINT16(devno, IplParameterBlock),
  39         VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88),
  40         VMSTATE_END_OF_LIST()
  41     }
  42 };
  43
  44 static const VMStateDescription vmstate_ipl = {
  45     .name = "ipl",
  46     .version_id = 0,
  47     .minimum_version_id = 0,
  48     .fields = (VMStateField[]) {
  49         VMSTATE_UINT64(start_addr, S390IPLState),
  50         VMSTATE_UINT64(bios_start_addr, S390IPLState),
  51         VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock),
  52         VMSTATE_BOOL(iplb_valid, S390IPLState),
  53         VMSTATE_UINT8(cssid, S390IPLState),
  54         VMSTATE_UINT8(ssid, S390IPLState),
  55         VMSTATE_UINT16(devno, S390IPLState),
  56         VMSTATE_END_OF_LIST()
  57      }
  58 };
  59
  60 static S390IPLState *get_ipl_device(void)
  61 {
  62     return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL));
  63 }
  64
  65 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
  66 {
  67     uint64_t dstaddr = *(uint64_t *) opaque;
  68     /*
  69      * Assuming that our s390-ccw.img was linked for starting at address 0,
  70      * we can simply add the destination address for the final location
  71      */
  72     return srcaddr + dstaddr;
  73 }
  74
  75 static void s390_ipl_realize(DeviceState *dev, Error **errp)
  76 {
  77     S390IPLState *ipl = S390_IPL(dev);
  78     uint64_t pentry = KERN_IMAGE_START;
  79     int kernel_size;
  80     Error *err = NULL;
  81
  82     int bios_size;
  83     char *bios_filename;
  84
  85     /*
  86      * Always load the bios if it was enforced,
  87      * even if an external kernel has been defined.
  88      */
  89     if (!ipl->kernel || ipl->enforce_bios) {
  90         uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL;
  91
  92         if (bios_name == NULL) {
  93             bios_name = ipl->firmware;
  94         }
  95
  96         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  97         if (bios_filename == NULL) {
  98             error_setg(&err, "could not find stage1 bootloader");
  99             goto error;
 100         }
 101
 102         bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase,
 103                              &ipl->bios_start_addr, NULL, NULL, 1,
 104                              EM_S390, 0);
 105         if (bios_size > 0) {
 106             /* Adjust ELF start address to final location */
 107             ipl->bios_start_addr += fwbase;
 108         } else {
 109             /* Try to load non-ELF file (e.g. s390-zipl.rom) */
 110             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
 111                                             4096);
 112             ipl->bios_start_addr = ZIPL_IMAGE_START;
 113         }
 114         g_free(bios_filename);
 115
 116         if (bios_size == -1) {
 117             error_setg(&err, "could not load bootloader '%s'", bios_name);
 118             goto error;
 119         }
 120
 121         /* default boot target is the bios */
 122         ipl->start_addr = ipl->bios_start_addr;
 123     }
 124
 125     if (ipl->kernel) {
 126         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 127                                NULL, 1, EM_S390, 0);
 128         if (kernel_size < 0) {
 129             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 130         }
 131         if (kernel_size < 0) {
 132             error_setg(&err, "could not load kernel '%s'", ipl->kernel);
 133             goto error;
 134         }
 135         /*
 136          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 137          * kernel parameters here as well. Note: For old kernels (up to 3.2)
 138          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 139          * loader) and it won't work. For this case we force it to 0x10000, too.
 140          */
 141         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 142             ipl->start_addr = KERN_IMAGE_START;
 143             /* Overwrite parameters in the kernel image, which are "rom" */
 144             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 145         } else {
 146             ipl->start_addr = pentry;
 147         }
 148
 149         if (ipl->initrd) {
 150             ram_addr_t initrd_offset;
 151             int initrd_size;
 152
 153             initrd_offset = INITRD_START;
 154             while (kernel_size + 0x100000 > initrd_offset) {
 155                 initrd_offset += 0x100000;
 156             }
 157             initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 158                                               ram_size - initrd_offset);
 159             if (initrd_size == -1) {
 160                 error_setg(&err, "could not load initrd '%s'", ipl->initrd);
 161                 goto error;
 162             }
 163
 164             /*
 165              * we have to overwrite values in the kernel image,
 166              * which are "rom"
 167              */
 168             stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 169             stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 170         }
 171     }
 172     qemu_register_reset(qdev_reset_all_fn, dev);
 173 error:
 174     error_propagate(errp, err);
 175 }
 176
 177 static Property s390_ipl_properties[] = {
 178     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 179     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 180     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 181     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 182     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
 183     DEFINE_PROP_END_OF_LIST(),
 184 };
 185
 186 /*
 187  * In addition to updating the iplstate, this function returns:
 188  * - 0 if system was ipled with external kernel
 189  * - -1 if no valid boot device was found
 190  * - ccw id of the boot device otherwise
 191  */
 192 static uint64_t s390_update_iplstate(S390IPLState *ipl)
 193 {
 194     DeviceState *dev_st;
 195
 196     if (ipl->iplb_valid) {
 197         ipl->cssid = 0;
 198         ipl->ssid = 0;
 199         ipl->devno = ipl->iplb.devno;
 200         goto out;
 201     }
 202
 203     if (ipl->kernel) {
 204         return 0;
 205     }
 206
 207     dev_st = get_boot_device(0);
 208     if (dev_st) {
 209         VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 210             OBJECT(qdev_get_parent_bus(dev_st)->parent),
 211                 TYPE_VIRTIO_CCW_DEVICE);
 212         if (ccw_dev) {
 213             ipl->cssid = ccw_dev->sch->cssid;
 214             ipl->ssid = ccw_dev->sch->ssid;
 215             ipl->devno = ccw_dev->sch->devno;
 216             goto out;
 217         }
 218     }
 219
 220     return -1;
 221 out:
 222     return (uint32_t) (ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno);
 223 }
 224
 225 void s390_ipl_update_diag308(IplParameterBlock *iplb)
 226 {
 227     S390IPLState *ipl = get_ipl_device();
 228
 229     ipl->iplb = *iplb;
 230     ipl->iplb_valid = true;
 231 }
 232
 233 IplParameterBlock *s390_ipl_get_iplb(void)
 234 {
 235     S390IPLState *ipl = get_ipl_device();
 236
 237     if (!ipl->iplb_valid) {
 238         return NULL;
 239     }
 240     return &ipl->iplb;
 241 }
 242
 243 void s390_reipl_request(void)
 244 {
 245     S390IPLState *ipl = get_ipl_device();
 246
 247     ipl->reipl_requested = true;
 248     qemu_system_reset_request();
 249 }
 250
 251 void s390_ipl_prepare_cpu(S390CPU *cpu)
 252 {
 253     S390IPLState *ipl = get_ipl_device();
 254
 255     cpu->env.psw.addr = ipl->start_addr;
 256     cpu->env.psw.mask = IPL_PSW_MASK;
 257
 258     if (!ipl->kernel || ipl->iplb_valid) {
 259         cpu->env.psw.addr = ipl->bios_start_addr;
 260         cpu->env.regs[7] = s390_update_iplstate(ipl);
 261     }
 262 }
 263
 264 static void s390_ipl_reset(DeviceState *dev)
 265 {
 266     S390IPLState *ipl = S390_IPL(dev);
 267
 268     if (!ipl->reipl_requested) {
 269         ipl->iplb_valid = false;
 270     }
 271     ipl->reipl_requested = false;
 272 }
 273
 274 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 275 {
 276     DeviceClass *dc = DEVICE_CLASS(klass);
 277
 278     dc->realize = s390_ipl_realize;
 279     dc->props = s390_ipl_properties;
 280     dc->reset = s390_ipl_reset;
 281     dc->vmsd = &vmstate_ipl;
 282     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 283 }
 284
 285 static const TypeInfo s390_ipl_info = {
 286     .class_init = s390_ipl_class_init,
 287     .parent = TYPE_DEVICE,
 288     .name  = TYPE_S390_IPL,
 289     .instance_size  = sizeof(S390IPLState),
 290 };
 291
 292 static void s390_ipl_register_types(void)
 293 {
 294     type_register_static(&s390_ipl_info);
 295 }
 296
 297 type_init(s390_ipl_register_types)