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
  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 #define TYPE_S390_IPL "s390-ipl"
  32 #define S390_IPL(obj) \
  33     OBJECT_CHECK(S390IPLState, (obj), TYPE_S390_IPL)
  34 #if 0
  35 #define S390_IPL_CLASS(klass) \
  36     OBJECT_CLASS_CHECK(S390IPLState, (klass), TYPE_S390_IPL)
  37 #define S390_IPL_GET_CLASS(obj) \
  38     OBJECT_GET_CLASS(S390IPLState, (obj), TYPE_S390_IPL)
  39 #endif
  40
  41 typedef struct S390IPLClass {
  42     /*< private >*/
  43     SysBusDeviceClass parent_class;
  44     /*< public >*/
  45
  46     void (*parent_reset) (SysBusDevice *dev);
  47 } S390IPLClass;
  48
  49 typedef struct S390IPLState {
  50     /*< private >*/
  51     SysBusDevice parent_obj;
  52     uint64_t start_addr;
  53
  54     /*< public >*/
  55     char *kernel;
  56     char *initrd;
  57     char *cmdline;
  58     char *firmware;
  59 } S390IPLState;
  60
  61
  62 static int s390_ipl_init(SysBusDevice *dev)
  63 {
  64     S390IPLState *ipl = S390_IPL(dev);
  65     int kernel_size;
  66
  67     if (!ipl->kernel) {
  68         int bios_size;
  69         char *bios_filename;
  70
  71         /* Load zipl bootloader */
  72         if (bios_name == NULL) {
  73             bios_name = ipl->firmware;
  74         }
  75
  76         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  77         if (bios_filename == NULL) {
  78             hw_error("could not find stage1 bootloader\n");
  79         }
  80
  81         bios_size = load_elf(bios_filename, NULL, NULL, &ipl->start_addr, NULL,
  82                              NULL, 1, ELF_MACHINE, 0);
  83         if (bios_size == -1) {
  84             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
  85                                             4096);
  86             ipl->start_addr = ZIPL_IMAGE_START;
  87             if (bios_size > 4096) {
  88                 hw_error("stage1 bootloader is > 4k\n");
  89             }
  90         }
  91         g_free(bios_filename);
  92
  93         if (bios_size == -1) {
  94             hw_error("could not load bootloader '%s'\n", bios_name);
  95         }
  96         return 0;
  97     } else {
  98         kernel_size = load_elf(ipl->kernel, NULL, NULL, NULL, NULL,
  99                                NULL, 1, ELF_MACHINE, 0);
 100         if (kernel_size == -1) {
 101             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 102         }
 103         if (kernel_size == -1) {
 104             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 105             return -1;
 106         }
 107         /* we have to overwrite values in the kernel image, which are "rom" */
 108         strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 109
 110         /*
 111          * we can not rely on the ELF entry point, since up to 3.2 this
 112          * value was 0x800 (the SALIPL loader) and it wont work. For
 113          * all (Linux) cases 0x10000 (KERN_IMAGE_START) should be fine.
 114          */
 115         ipl->start_addr = KERN_IMAGE_START;
 116     }
 117     if (ipl->initrd) {
 118         ram_addr_t initrd_offset;
 119         int initrd_size;
 120
 121         initrd_offset = INITRD_START;
 122         while (kernel_size + 0x100000 > initrd_offset) {
 123             initrd_offset += 0x100000;
 124         }
 125         initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 126                                           ram_size - initrd_offset);
 127         if (initrd_size == -1) {
 128             fprintf(stderr, "qemu: could not load initrd '%s'\n", ipl->initrd);
 129             exit(1);
 130         }
 131
 132         /* we have to overwrite values in the kernel image, which are "rom" */
 133         stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 134         stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 135     }
 136
 137     return 0;
 138 }
 139
 140 static Property s390_ipl_properties[] = {
 141     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 142     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 143     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 144     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 145     DEFINE_PROP_END_OF_LIST(),
 146 };
 147
 148 static void s390_ipl_reset(DeviceState *dev)
 149 {
 150     S390IPLState *ipl = S390_IPL(dev);
 151     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
 152     CPUS390XState *env = &cpu->env;
 153
 154     env->psw.addr = ipl->start_addr;
 155     env->psw.mask = IPL_PSW_MASK;
 156
 157     if (!ipl->kernel) {
 158         /* Tell firmware, if there is a preferred boot device */
 159         env->regs[7] = -1;
 160         DeviceState *dev_st = get_boot_device(0);
 161         if (dev_st) {
 162             VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 163                 OBJECT(qdev_get_parent_bus(dev_st)->parent),
 164                 TYPE_VIRTIO_CCW_DEVICE);
 165
 166             if (ccw_dev) {
 167                 env->regs[7] = ccw_dev->sch->cssid << 24 |
 168                                ccw_dev->sch->ssid << 16 |
 169                                ccw_dev->sch->devno;
 170             }
 171         }
 172     }
 173
 174     s390_add_running_cpu(cpu);
 175 }
 176
 177 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 178 {
 179     DeviceClass *dc = DEVICE_CLASS(klass);
 180     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 181
 182     k->init = s390_ipl_init;
 183     dc->props = s390_ipl_properties;
 184     dc->reset = s390_ipl_reset;
 185 }
 186
 187 static const TypeInfo s390_ipl_info = {
 188     .class_init = s390_ipl_class_init,
 189     .parent = TYPE_SYS_BUS_DEVICE,
 190     .name  = "s390-ipl",
 191     .instance_size  = sizeof(S390IPLState),
 192 };
 193
 194 static void s390_ipl_register_types(void)
 195 {
 196     type_register_static(&s390_ipl_info);
 197 }
 198
 199 type_init(s390_ipl_register_types)