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
  71 static int s390_ipl_init(SysBusDevice *dev)
  72 {
  73     S390IPLState *ipl = S390_IPL(dev);
  74     uint64_t pentry = KERN_IMAGE_START;
  75     int kernel_size;
  76
  77     int bios_size;
  78     char *bios_filename;
  79
  80     /*
  81      * Always load the bios if it was enforced,
  82      * even if an external kernel has been defined.
  83      */
  84     if (!ipl->kernel || ipl->enforce_bios) {
  85         if (bios_name == NULL) {
  86             bios_name = ipl->firmware;
  87         }
  88
  89         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  90         if (bios_filename == NULL) {
  91             hw_error("could not find stage1 bootloader\n");
  92         }
  93
  94         bios_size = load_elf(bios_filename, NULL, NULL, &ipl->bios_start_addr,
  95                              NULL, NULL, 1, ELF_MACHINE, 0);
  96         if (bios_size < 0) {
  97             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
  98                                             4096);
  99             ipl->bios_start_addr = ZIPL_IMAGE_START;
 100             if (bios_size > 4096) {
 101                 hw_error("stage1 bootloader is > 4k\n");
 102             }
 103         }
 104         g_free(bios_filename);
 105
 106         if (bios_size == -1) {
 107             hw_error("could not load bootloader '%s'\n", bios_name);
 108         }
 109
 110         /* default boot target is the bios */
 111         ipl->start_addr = ipl->bios_start_addr;
 112     }
 113
 114     if (ipl->kernel) {
 115         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 116                                NULL, 1, ELF_MACHINE, 0);
 117         if (kernel_size < 0) {
 118             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 119         }
 120         if (kernel_size < 0) {
 121             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 122             return -1;
 123         }
 124         /*
 125          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 126          * kernel parameters here as well. Note: For old kernels (up to 3.2)
 127          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 128          * loader) and it won't work. For this case we force it to 0x10000, too.
 129          */
 130         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 131             ipl->start_addr = KERN_IMAGE_START;
 132             /* Overwrite parameters in the kernel image, which are "rom" */
 133             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 134         } else {
 135             ipl->start_addr = pentry;
 136         }
 137
 138         if (ipl->initrd) {
 139             ram_addr_t initrd_offset;
 140             int initrd_size;
 141
 142             initrd_offset = INITRD_START;
 143             while (kernel_size + 0x100000 > initrd_offset) {
 144                 initrd_offset += 0x100000;
 145             }
 146             initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 147                                               ram_size - initrd_offset);
 148             if (initrd_size == -1) {
 149                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 150                         ipl->initrd);
 151                 exit(1);
 152             }
 153
 154             /*
 155              * we have to overwrite values in the kernel image,
 156              * which are "rom"
 157              */
 158             stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 159             stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 160         }
 161     }
 162     return 0;
 163 }
 164
 165 static Property s390_ipl_properties[] = {
 166     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 167     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 168     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 169     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 170     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
 171     DEFINE_PROP_END_OF_LIST(),
 172 };
 173
 174 /*
 175  * In addition to updating the iplstate, this function returns:
 176  * - 0 if system was ipled with external kernel
 177  * - -1 if no valid boot device was found
 178  * - ccw id of the boot device otherwise
 179  */
 180 static uint64_t s390_update_iplstate(CPUS390XState *env, S390IPLState *ipl)
 181 {
 182     DeviceState *dev_st;
 183
 184     if (ipl->iplb_valid) {
 185         ipl->cssid = 0;
 186         ipl->ssid = 0;
 187         ipl->devno = ipl->iplb.devno;
 188         goto out;
 189     }
 190
 191     if (ipl->kernel) {
 192         return 0;
 193     }
 194
 195     dev_st = get_boot_device(0);
 196     if (dev_st) {
 197         VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 198             OBJECT(qdev_get_parent_bus(dev_st)->parent),
 199                 TYPE_VIRTIO_CCW_DEVICE);
 200         if (ccw_dev) {
 201             ipl->cssid = ccw_dev->sch->cssid;
 202             ipl->ssid = ccw_dev->sch->ssid;
 203             ipl->devno = ccw_dev->sch->devno;
 204             goto out;
 205         }
 206     }
 207
 208     return -1;
 209 out:
 210     return ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno;
 211 }
 212
 213 int s390_ipl_update_diag308(IplParameterBlock *iplb)
 214 {
 215     S390IPLState *ipl;
 216
 217     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 218     if (ipl) {
 219         ipl->iplb = *iplb;
 220         ipl->iplb_valid = true;
 221         return 0;
 222     }
 223     return -1;
 224 }
 225
 226 IplParameterBlock *s390_ipl_get_iplb(void)
 227 {
 228     S390IPLState *ipl;
 229
 230     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 231     if (!ipl || !ipl->iplb_valid) {
 232         return NULL;
 233     }
 234     return &ipl->iplb;
 235 }
 236
 237 void s390_reipl_request(void)
 238 {
 239     S390IPLState *ipl;
 240
 241     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 242     ipl->reipl_requested = true;
 243     qemu_system_reset_request();
 244 }
 245
 246 static void s390_ipl_reset(DeviceState *dev)
 247 {
 248     S390IPLState *ipl = S390_IPL(dev);
 249     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
 250     CPUS390XState *env = &cpu->env;
 251
 252     env->psw.addr = ipl->start_addr;
 253     env->psw.mask = IPL_PSW_MASK;
 254
 255     if (!ipl->reipl_requested) {
 256         ipl->iplb_valid = false;
 257     }
 258     ipl->reipl_requested = false;
 259
 260     if (!ipl->kernel || ipl->iplb_valid) {
 261         env->psw.addr = ipl->bios_start_addr;
 262         env->regs[7] = s390_update_iplstate(env, ipl);
 263     }
 264
 265     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
 266 }
 267
 268 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 269 {
 270     DeviceClass *dc = DEVICE_CLASS(klass);
 271     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 272
 273     k->init = s390_ipl_init;
 274     dc->props = s390_ipl_properties;
 275     dc->reset = s390_ipl_reset;
 276 }
 277
 278 static const TypeInfo s390_ipl_info = {
 279     .class_init = s390_ipl_class_init,
 280     .parent = TYPE_SYS_BUS_DEVICE,
 281     .name  = "s390-ipl",
 282     .instance_size  = sizeof(S390IPLState),
 283 };
 284
 285 static void s390_ipl_register_types(void)
 286 {
 287     type_register_static(&s390_ipl_info);
 288 }
 289
 290 type_init(s390_ipl_register_types)