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
  59     /*< public >*/
  60     char *kernel;
  61     char *initrd;
  62     char *cmdline;
  63     char *firmware;
  64     uint8_t cssid;
  65     uint8_t ssid;
  66     uint16_t devno;
  67 } S390IPLState;
  68
  69
  70 static int s390_ipl_init(SysBusDevice *dev)
  71 {
  72     S390IPLState *ipl = S390_IPL(dev);
  73     uint64_t pentry = KERN_IMAGE_START;
  74     int kernel_size;
  75
  76     int bios_size;
  77     char *bios_filename;
  78
  79     /*
  80      * Always load the bios if it was enforced,
  81      * even if an external kernel has been defined.
  82      */
  83     if (!ipl->kernel || ipl->enforce_bios) {
  84         if (bios_name == NULL) {
  85             bios_name = ipl->firmware;
  86         }
  87
  88         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  89         if (bios_filename == NULL) {
  90             hw_error("could not find stage1 bootloader\n");
  91         }
  92
  93         bios_size = load_elf(bios_filename, NULL, NULL, &ipl->bios_start_addr,
  94                              NULL, NULL, 1, ELF_MACHINE, 0);
  95         if (bios_size < 0) {
  96             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
  97                                             4096);
  98             ipl->bios_start_addr = ZIPL_IMAGE_START;
  99             if (bios_size > 4096) {
 100                 hw_error("stage1 bootloader is > 4k\n");
 101             }
 102         }
 103         g_free(bios_filename);
 104
 105         if (bios_size == -1) {
 106             hw_error("could not load bootloader '%s'\n", bios_name);
 107         }
 108
 109         /* default boot target is the bios */
 110         ipl->start_addr = ipl->bios_start_addr;
 111     }
 112
 113     if (ipl->kernel) {
 114         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 115                                NULL, 1, ELF_MACHINE, 0);
 116         if (kernel_size < 0) {
 117             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 118         }
 119         if (kernel_size < 0) {
 120             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 121             return -1;
 122         }
 123         /*
 124          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 125          * kernel parameters here as well. Note: For old kernels (up to 3.2)
 126          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 127          * loader) and it won't work. For this case we force it to 0x10000, too.
 128          */
 129         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 130             ipl->start_addr = KERN_IMAGE_START;
 131             /* Overwrite parameters in the kernel image, which are "rom" */
 132             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 133         } else {
 134             ipl->start_addr = pentry;
 135         }
 136
 137         if (ipl->initrd) {
 138             ram_addr_t initrd_offset;
 139             int initrd_size;
 140
 141             initrd_offset = INITRD_START;
 142             while (kernel_size + 0x100000 > initrd_offset) {
 143                 initrd_offset += 0x100000;
 144             }
 145             initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 146                                               ram_size - initrd_offset);
 147             if (initrd_size == -1) {
 148                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 149                         ipl->initrd);
 150                 exit(1);
 151             }
 152
 153             /*
 154              * we have to overwrite values in the kernel image,
 155              * which are "rom"
 156              */
 157             stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 158             stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 159         }
 160     }
 161     return 0;
 162 }
 163
 164 static Property s390_ipl_properties[] = {
 165     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 166     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 167     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 168     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 169     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
 170     DEFINE_PROP_END_OF_LIST(),
 171 };
 172
 173 /*
 174  * In addition to updating the iplstate, this function returns:
 175  * - 0 if system was ipled with external kernel
 176  * - -1 if no valid boot device was found
 177  * - ccw id of the boot device otherwise
 178  */
 179 static uint64_t s390_update_iplstate(CPUS390XState *env, S390IPLState *ipl)
 180 {
 181     DeviceState *dev_st;
 182
 183     if (ipl->iplb_valid) {
 184         ipl->cssid = 0;
 185         ipl->ssid = 0;
 186         ipl->devno = ipl->iplb.devno;
 187         goto out;
 188     }
 189
 190     if (ipl->kernel) {
 191         return 0;
 192     }
 193
 194     dev_st = get_boot_device(0);
 195     if (dev_st) {
 196         VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 197             OBJECT(qdev_get_parent_bus(dev_st)->parent),
 198                 TYPE_VIRTIO_CCW_DEVICE);
 199         if (ccw_dev) {
 200             ipl->cssid = ccw_dev->sch->cssid;
 201             ipl->ssid = ccw_dev->sch->ssid;
 202             ipl->devno = ccw_dev->sch->devno;
 203             goto out;
 204         }
 205     }
 206
 207     return -1;
 208 out:
 209     return ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno;
 210 }
 211
 212 int s390_ipl_update_diag308(IplParameterBlock *iplb)
 213 {
 214     S390IPLState *ipl;
 215
 216     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 217     if (ipl) {
 218         ipl->iplb = *iplb;
 219         ipl->iplb_valid = true;
 220         return 0;
 221     }
 222     return -1;
 223 }
 224
 225 IplParameterBlock *s390_ipl_get_iplb(void)
 226 {
 227     S390IPLState *ipl;
 228
 229     ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
 230     if (!ipl || !ipl->iplb_valid) {
 231         return NULL;
 232     }
 233     return &ipl->iplb;
 234 }
 235
 236 static void s390_ipl_reset(DeviceState *dev)
 237 {
 238     S390IPLState *ipl = S390_IPL(dev);
 239     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
 240     CPUS390XState *env = &cpu->env;
 241
 242     env->psw.addr = ipl->start_addr;
 243     env->psw.mask = IPL_PSW_MASK;
 244
 245     if (!ipl->kernel || ipl->iplb_valid) {
 246         env->psw.addr = ipl->bios_start_addr;
 247         env->regs[7] = s390_update_iplstate(env, ipl);
 248     }
 249
 250     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
 251 }
 252
 253 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 254 {
 255     DeviceClass *dc = DEVICE_CLASS(klass);
 256     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 257
 258     k->init = s390_ipl_init;
 259     dc->props = s390_ipl_properties;
 260     dc->reset = s390_ipl_reset;
 261 }
 262
 263 static const TypeInfo s390_ipl_info = {
 264     .class_init = s390_ipl_class_init,
 265     .parent = TYPE_SYS_BUS_DEVICE,
 266     .name  = "s390-ipl",
 267     .instance_size  = sizeof(S390IPLState),
 268 };
 269
 270 static void s390_ipl_register_types(void)
 271 {
 272     type_register_static(&s390_ipl_info);
 273 }
 274
 275 type_init(s390_ipl_register_types)