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
  20 #define KERN_IMAGE_START                0x010000UL
  21 #define KERN_PARM_AREA                  0x010480UL
  22 #define INITRD_START                    0x800000UL
  23 #define INITRD_PARM_START               0x010408UL
  24 #define INITRD_PARM_SIZE                0x010410UL
  25 #define PARMFILE_START                  0x001000UL
  26 #define ZIPL_FILENAME                   "s390-zipl.rom"
  27 #define ZIPL_IMAGE_START                0x009000UL
  28 #define IPL_PSW_MASK                    (PSW_MASK_32 | PSW_MASK_64)
  29
  30 #define TYPE_S390_IPL "s390-ipl"
  31 #define S390_IPL(obj) \
  32     OBJECT_CHECK(S390IPLState, (obj), TYPE_S390_IPL)
  33 #if 0
  34 #define S390_IPL_CLASS(klass) \
  35     OBJECT_CLASS_CHECK(S390IPLState, (klass), TYPE_S390_IPL)
  36 #define S390_IPL_GET_CLASS(obj) \
  37     OBJECT_GET_CLASS(S390IPLState, (obj), TYPE_S390_IPL)
  38 #endif
  39
  40 typedef struct S390IPLClass {
  41     /*< private >*/
  42     SysBusDeviceClass parent_class;
  43     /*< public >*/
  44
  45     void (*parent_reset) (SysBusDevice *dev);
  46 } S390IPLClass;
  47
  48 typedef struct S390IPLState {
  49     /*< private >*/
  50     SysBusDevice parent_obj;
  51     /*< public >*/
  52
  53     char *kernel;
  54     char *initrd;
  55     char *cmdline;
  56 } S390IPLState;
  57
  58
  59 static void s390_ipl_cpu(uint64_t pswaddr)
  60 {
  61     CPUS390XState *env = &S390_CPU(qemu_get_cpu(0))->env;
  62     env->psw.addr = pswaddr;
  63     env->psw.mask = IPL_PSW_MASK;
  64     s390_add_running_cpu(env);
  65 }
  66
  67 static int s390_ipl_init(SysBusDevice *dev)
  68 {
  69     S390IPLState *ipl = S390_IPL(dev);
  70     ram_addr_t kernel_size = 0;
  71
  72     if (!ipl->kernel) {
  73         ram_addr_t bios_size = 0;
  74         char *bios_filename;
  75
  76         /* Load zipl bootloader */
  77         if (bios_name == NULL) {
  78             bios_name = ZIPL_FILENAME;
  79         }
  80
  81         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  82         bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START, 4096);
  83         g_free(bios_filename);
  84
  85         if ((long)bios_size < 0) {
  86             hw_error("could not load bootloader '%s'\n", bios_name);
  87         }
  88
  89         if (bios_size > 4096) {
  90             hw_error("stage1 bootloader is > 4k\n");
  91         }
  92         return 0;
  93     } else {
  94         kernel_size = load_elf(ipl->kernel, NULL, NULL, NULL, NULL,
  95                                NULL, 1, ELF_MACHINE, 0);
  96         if (kernel_size == -1UL) {
  97             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
  98         }
  99         if (kernel_size == -1UL) {
 100             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 101             return -1;
 102         }
 103         /* we have to overwrite values in the kernel image, which are "rom" */
 104         strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 105     }
 106     if (ipl->initrd) {
 107         ram_addr_t initrd_offset, initrd_size;
 108
 109         initrd_offset = INITRD_START;
 110         while (kernel_size + 0x100000 > initrd_offset) {
 111             initrd_offset += 0x100000;
 112         }
 113         initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 114                                           ram_size - initrd_offset);
 115         if (initrd_size == -1UL) {
 116             fprintf(stderr, "qemu: could not load initrd '%s'\n", ipl->initrd);
 117             exit(1);
 118         }
 119
 120         /* we have to overwrite values in the kernel image, which are "rom" */
 121         stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 122         stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 123     }
 124
 125     return 0;
 126 }
 127
 128 static Property s390_ipl_properties[] = {
 129     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 130     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 131     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 132     DEFINE_PROP_END_OF_LIST(),
 133 };
 134
 135 static void s390_ipl_reset(DeviceState *dev)
 136 {
 137     S390IPLState *ipl = S390_IPL(dev);
 138
 139     if (ipl->kernel) {
 140         /*
 141          * we can not rely on the ELF entry point, since up to 3.2 this
 142          * value was 0x800 (the SALIPL loader) and it wont work. For
 143          * all (Linux) cases 0x10000 (KERN_IMAGE_START) should be fine.
 144          */
 145         return s390_ipl_cpu(KERN_IMAGE_START);
 146     } else {
 147         return s390_ipl_cpu(ZIPL_IMAGE_START);
 148     }
 149 }
 150
 151 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 152 {
 153     DeviceClass *dc = DEVICE_CLASS(klass);
 154     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 155
 156     k->init = s390_ipl_init;
 157     dc->props = s390_ipl_properties;
 158     dc->reset = s390_ipl_reset;
 159     dc->no_user = 1;
 160 }
 161
 162 static TypeInfo s390_ipl_info = {
 163     .class_init = s390_ipl_class_init,
 164     .parent = TYPE_SYS_BUS_DEVICE,
 165     .name  = "s390-ipl",
 166     .instance_size  = sizeof(S390IPLState),
 167 };
 168
 169 static void s390_ipl_register_types(void)
 170 {
 171     type_register_static(&s390_ipl_info);
 172 }
 173
 174 type_init(s390_ipl_register_types)