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     uint64_t pentry = KERN_IMAGE_START;
  66     int kernel_size;
  67
  68     if (!ipl->kernel) {
  69         int bios_size;
  70         char *bios_filename;
  71
  72         /* Load zipl bootloader */
  73         if (bios_name == NULL) {
  74             bios_name = ipl->firmware;
  75         }
  76
  77         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  78         if (bios_filename == NULL) {
  79             hw_error("could not find stage1 bootloader\n");
  80         }
  81
  82         bios_size = load_elf(bios_filename, NULL, NULL, &ipl->start_addr, NULL,
  83                              NULL, 1, ELF_MACHINE, 0);
  84         if (bios_size < 0) {
  85             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
  86                                             4096);
  87             ipl->start_addr = ZIPL_IMAGE_START;
  88             if (bios_size > 4096) {
  89                 hw_error("stage1 bootloader is > 4k\n");
  90             }
  91         }
  92         g_free(bios_filename);
  93
  94         if (bios_size == -1) {
  95             hw_error("could not load bootloader '%s'\n", bios_name);
  96         }
  97         return 0;
  98     }
  99
 100     kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 101                            NULL, 1, ELF_MACHINE, 0);
 102     if (kernel_size < 0) {
 103         kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 104     }
 105     if (kernel_size < 0) {
 106         fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 107         return -1;
 108     }
 109     /*
 110      * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 111      * kernel parameters here as well. Note: For old kernels (up to 3.2)
 112      * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 113      * loader) and it won't work. For this case we force it to 0x10000, too.
 114      */
 115     if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 116         ipl->start_addr = KERN_IMAGE_START;
 117         /* Overwrite parameters in the kernel image, which are "rom" */
 118         strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 119     } else {
 120         ipl->start_addr = pentry;
 121     }
 122
 123     if (ipl->initrd) {
 124         ram_addr_t initrd_offset;
 125         int initrd_size;
 126
 127         initrd_offset = INITRD_START;
 128         while (kernel_size + 0x100000 > initrd_offset) {
 129             initrd_offset += 0x100000;
 130         }
 131         initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 132                                           ram_size - initrd_offset);
 133         if (initrd_size == -1) {
 134             fprintf(stderr, "qemu: could not load initrd '%s'\n", ipl->initrd);
 135             exit(1);
 136         }
 137
 138         /* we have to overwrite values in the kernel image, which are "rom" */
 139         stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 140         stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 141     }
 142
 143     return 0;
 144 }
 145
 146 static Property s390_ipl_properties[] = {
 147     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 148     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 149     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 150     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 151     DEFINE_PROP_END_OF_LIST(),
 152 };
 153
 154 static void s390_ipl_reset(DeviceState *dev)
 155 {
 156     S390IPLState *ipl = S390_IPL(dev);
 157     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
 158     CPUS390XState *env = &cpu->env;
 159
 160     env->psw.addr = ipl->start_addr;
 161     env->psw.mask = IPL_PSW_MASK;
 162
 163     if (!ipl->kernel) {
 164         /* Tell firmware, if there is a preferred boot device */
 165         env->regs[7] = -1;
 166         DeviceState *dev_st = get_boot_device(0);
 167         if (dev_st) {
 168             VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 169                 OBJECT(qdev_get_parent_bus(dev_st)->parent),
 170                 TYPE_VIRTIO_CCW_DEVICE);
 171
 172             if (ccw_dev) {
 173                 env->regs[7] = ccw_dev->sch->cssid << 24 |
 174                                ccw_dev->sch->ssid << 16 |
 175                                ccw_dev->sch->devno;
 176             }
 177         }
 178     }
 179
 180     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
 181 }
 182
 183 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 184 {
 185     DeviceClass *dc = DEVICE_CLASS(klass);
 186     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 187
 188     k->init = s390_ipl_init;
 189     dc->props = s390_ipl_properties;
 190     dc->reset = s390_ipl_reset;
 191 }
 192
 193 static const TypeInfo s390_ipl_info = {
 194     .class_init = s390_ipl_class_init,
 195     .parent = TYPE_SYS_BUS_DEVICE,
 196     .name  = "s390-ipl",
 197     .instance_size  = sizeof(S390IPLState),
 198 };
 199
 200 static void s390_ipl_register_types(void)
 201 {
 202     type_register_static(&s390_ipl_info);
 203 }
 204
 205 type_init(s390_ipl_register_types)