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     uint64_t bios_start_addr;
  54     bool enforce_bios;
  55
  56     /*< public >*/
  57     char *kernel;
  58     char *initrd;
  59     char *cmdline;
  60     char *firmware;
  61 } S390IPLState;
  62
  63
  64 static int s390_ipl_init(SysBusDevice *dev)
  65 {
  66     S390IPLState *ipl = S390_IPL(dev);
  67     uint64_t pentry = KERN_IMAGE_START;
  68     int kernel_size;
  69
  70     int bios_size;
  71     char *bios_filename;
  72
  73     /*
  74      * Always load the bios if it was enforced,
  75      * even if an external kernel has been defined.
  76      */
  77     if (!ipl->kernel || ipl->enforce_bios) {
  78         if (bios_name == NULL) {
  79             bios_name = ipl->firmware;
  80         }
  81
  82         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  83         if (bios_filename == NULL) {
  84             hw_error("could not find stage1 bootloader\n");
  85         }
  86
  87         bios_size = load_elf(bios_filename, NULL, NULL, &ipl->bios_start_addr,
  88                              NULL, NULL, 1, ELF_MACHINE, 0);
  89         if (bios_size < 0) {
  90             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
  91                                             4096);
  92             ipl->bios_start_addr = ZIPL_IMAGE_START;
  93             if (bios_size > 4096) {
  94                 hw_error("stage1 bootloader is > 4k\n");
  95             }
  96         }
  97         g_free(bios_filename);
  98
  99         if (bios_size == -1) {
 100             hw_error("could not load bootloader '%s'\n", bios_name);
 101         }
 102
 103         /* default boot target is the bios */
 104         ipl->start_addr = ipl->bios_start_addr;
 105     }
 106
 107     if (ipl->kernel) {
 108         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 109                                NULL, 1, ELF_MACHINE, 0);
 110         if (kernel_size < 0) {
 111             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 112         }
 113         if (kernel_size < 0) {
 114             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 115             return -1;
 116         }
 117         /*
 118          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 119          * kernel parameters here as well. Note: For old kernels (up to 3.2)
 120          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 121          * loader) and it won't work. For this case we force it to 0x10000, too.
 122          */
 123         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 124             ipl->start_addr = KERN_IMAGE_START;
 125             /* Overwrite parameters in the kernel image, which are "rom" */
 126             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 127         } else {
 128             ipl->start_addr = pentry;
 129         }
 130
 131         if (ipl->initrd) {
 132             ram_addr_t initrd_offset;
 133             int initrd_size;
 134
 135             initrd_offset = INITRD_START;
 136             while (kernel_size + 0x100000 > initrd_offset) {
 137                 initrd_offset += 0x100000;
 138             }
 139             initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 140                                               ram_size - initrd_offset);
 141             if (initrd_size == -1) {
 142                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 143                         ipl->initrd);
 144                 exit(1);
 145             }
 146
 147             /*
 148              * we have to overwrite values in the kernel image,
 149              * which are "rom"
 150              */
 151             stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 152             stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 153         }
 154     }
 155     return 0;
 156 }
 157
 158 static Property s390_ipl_properties[] = {
 159     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 160     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 161     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 162     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 163     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
 164     DEFINE_PROP_END_OF_LIST(),
 165 };
 166
 167 static void s390_ipl_reset(DeviceState *dev)
 168 {
 169     S390IPLState *ipl = S390_IPL(dev);
 170     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
 171     CPUS390XState *env = &cpu->env;
 172
 173     env->psw.addr = ipl->start_addr;
 174     env->psw.mask = IPL_PSW_MASK;
 175
 176     if (!ipl->kernel) {
 177         /* Tell firmware, if there is a preferred boot device */
 178         env->regs[7] = -1;
 179         DeviceState *dev_st = get_boot_device(0);
 180         if (dev_st) {
 181             VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 182                 OBJECT(qdev_get_parent_bus(dev_st)->parent),
 183                 TYPE_VIRTIO_CCW_DEVICE);
 184
 185             if (ccw_dev) {
 186                 env->regs[7] = ccw_dev->sch->cssid << 24 |
 187                                ccw_dev->sch->ssid << 16 |
 188                                ccw_dev->sch->devno;
 189             }
 190         }
 191     }
 192
 193     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
 194 }
 195
 196 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 197 {
 198     DeviceClass *dc = DEVICE_CLASS(klass);
 199     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 200
 201     k->init = s390_ipl_init;
 202     dc->props = s390_ipl_properties;
 203     dc->reset = s390_ipl_reset;
 204 }
 205
 206 static const TypeInfo s390_ipl_info = {
 207     .class_init = s390_ipl_class_init,
 208     .parent = TYPE_SYS_BUS_DEVICE,
 209     .name  = "s390-ipl",
 210     .instance_size  = sizeof(S390IPLState),
 211 };
 212
 213 static void s390_ipl_register_types(void)
 214 {
 215     type_register_static(&s390_ipl_info);
 216 }
 217
 218 type_init(s390_ipl_register_types)