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 < 0) {
  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         uint64_t pentry = KERN_IMAGE_START;
  99         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 100                                NULL, 1, ELF_MACHINE, 0);
 101         if (kernel_size < 0) {
 102             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 103         }
 104         if (kernel_size < 0) {
 105             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 106             return -1;
 107         }
 108         /*
 109          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 110          * kernel parameters here as well. Note: For old kernels (up to 3.2)
 111          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 112          * loader) and it won't work. For this case we force it to 0x10000, too.
 113          */
 114         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 115             ipl->start_addr = KERN_IMAGE_START;
 116             /* Overwrite parameters in the kernel image, which are "rom" */
 117             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 118         } else {
 119             ipl->start_addr = pentry;
 120         }
 121     }
 122     if (ipl->initrd) {
 123         ram_addr_t initrd_offset;
 124         int initrd_size;
 125
 126         initrd_offset = INITRD_START;
 127         while (kernel_size + 0x100000 > initrd_offset) {
 128             initrd_offset += 0x100000;
 129         }
 130         initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 131                                           ram_size - initrd_offset);
 132         if (initrd_size == -1) {
 133             fprintf(stderr, "qemu: could not load initrd '%s'\n", ipl->initrd);
 134             exit(1);
 135         }
 136
 137         /* we have to overwrite values in the kernel image, which are "rom" */
 138         stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 139         stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 140     }
 141
 142     return 0;
 143 }
 144
 145 static Property s390_ipl_properties[] = {
 146     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 147     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 148     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 149     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 150     DEFINE_PROP_END_OF_LIST(),
 151 };
 152
 153 static void s390_ipl_reset(DeviceState *dev)
 154 {
 155     S390IPLState *ipl = S390_IPL(dev);
 156     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
 157     CPUS390XState *env = &cpu->env;
 158
 159     env->psw.addr = ipl->start_addr;
 160     env->psw.mask = IPL_PSW_MASK;
 161
 162     if (!ipl->kernel) {
 163         /* Tell firmware, if there is a preferred boot device */
 164         env->regs[7] = -1;
 165         DeviceState *dev_st = get_boot_device(0);
 166         if (dev_st) {
 167             VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 168                 OBJECT(qdev_get_parent_bus(dev_st)->parent),
 169                 TYPE_VIRTIO_CCW_DEVICE);
 170
 171             if (ccw_dev) {
 172                 env->regs[7] = ccw_dev->sch->cssid << 24 |
 173                                ccw_dev->sch->ssid << 16 |
 174                                ccw_dev->sch->devno;
 175             }
 176         }
 177     }
 178
 179     s390_add_running_cpu(cpu);
 180 }
 181
 182 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 183 {
 184     DeviceClass *dc = DEVICE_CLASS(klass);
 185     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 186
 187     k->init = s390_ipl_init;
 188     dc->props = s390_ipl_properties;
 189     dc->reset = s390_ipl_reset;
 190 }
 191
 192 static const TypeInfo s390_ipl_info = {
 193     .class_init = s390_ipl_class_init,
 194     .parent = TYPE_SYS_BUS_DEVICE,
 195     .name  = "s390-ipl",
 196     .instance_size  = sizeof(S390IPLState),
 197 };
 198
 199 static void s390_ipl_register_types(void)
 200 {
 201     type_register_static(&s390_ipl_info);
 202 }
 203
 204 type_init(s390_ipl_register_types)