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_IMAGE_START                0x009000UL
  27 #define IPL_PSW_MASK                    (PSW_MASK_32 | PSW_MASK_64)
  28
  29 #define TYPE_S390_IPL "s390-ipl"
  30 #define S390_IPL(obj) \
  31     OBJECT_CHECK(S390IPLState, (obj), TYPE_S390_IPL)
  32 #if 0
  33 #define S390_IPL_CLASS(klass) \
  34     OBJECT_CLASS_CHECK(S390IPLState, (klass), TYPE_S390_IPL)
  35 #define S390_IPL_GET_CLASS(obj) \
  36     OBJECT_GET_CLASS(S390IPLState, (obj), TYPE_S390_IPL)
  37 #endif
  38
  39 typedef struct S390IPLClass {
  40     /*< private >*/
  41     SysBusDeviceClass parent_class;
  42     /*< public >*/
  43
  44     void (*parent_reset) (SysBusDevice *dev);
  45 } S390IPLClass;
  46
  47 typedef struct S390IPLState {
  48     /*< private >*/
  49     SysBusDevice parent_obj;
  50     uint64_t start_addr;
  51
  52     /*< public >*/
  53     char *kernel;
  54     char *initrd;
  55     char *cmdline;
  56     char *firmware;
  57 } S390IPLState;
  58
  59
  60 static void s390_ipl_cpu(uint64_t pswaddr)
  61 {
  62     S390CPU *cpu = S390_CPU(qemu_get_cpu(0));
  63     CPUS390XState *env = &cpu->env;
  64
  65     env->psw.addr = pswaddr;
  66     env->psw.mask = IPL_PSW_MASK;
  67     s390_add_running_cpu(cpu);
  68 }
  69
  70 static int s390_ipl_init(SysBusDevice *dev)
  71 {
  72     S390IPLState *ipl = S390_IPL(dev);
  73     ram_addr_t kernel_size = 0;
  74
  75     if (!ipl->kernel) {
  76         ram_addr_t bios_size = 0;
  77         char *bios_filename;
  78
  79         /* Load zipl bootloader */
  80         if (bios_name == NULL) {
  81             bios_name = ipl->firmware;
  82         }
  83
  84         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  85         bios_size = load_elf(bios_filename, NULL, NULL, &ipl->start_addr, NULL,
  86                              NULL, 1, ELF_MACHINE, 0);
  87         if (bios_size == -1UL) {
  88             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
  89                                             4096);
  90             ipl->start_addr = ZIPL_IMAGE_START;
  91             if (bios_size > 4096) {
  92                 hw_error("stage1 bootloader is > 4k\n");
  93             }
  94         }
  95         g_free(bios_filename);
  96
  97         if ((long)bios_size < 0) {
  98             hw_error("could not load bootloader '%s'\n", bios_name);
  99         }
 100         return 0;
 101     } else {
 102         kernel_size = load_elf(ipl->kernel, NULL, NULL, NULL, NULL,
 103                                NULL, 1, ELF_MACHINE, 0);
 104         if (kernel_size == -1UL) {
 105             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 106         }
 107         if (kernel_size == -1UL) {
 108             fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel);
 109             return -1;
 110         }
 111         /* we have to overwrite values in the kernel image, which are "rom" */
 112         strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 113
 114         /*
 115          * we can not rely on the ELF entry point, since up to 3.2 this
 116          * value was 0x800 (the SALIPL loader) and it wont work. For
 117          * all (Linux) cases 0x10000 (KERN_IMAGE_START) should be fine.
 118          */
 119         ipl->start_addr = KERN_IMAGE_START;
 120     }
 121     if (ipl->initrd) {
 122         ram_addr_t initrd_offset, initrd_size;
 123
 124         initrd_offset = INITRD_START;
 125         while (kernel_size + 0x100000 > initrd_offset) {
 126             initrd_offset += 0x100000;
 127         }
 128         initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 129                                           ram_size - initrd_offset);
 130         if (initrd_size == -1UL) {
 131             fprintf(stderr, "qemu: could not load initrd '%s'\n", ipl->initrd);
 132             exit(1);
 133         }
 134
 135         /* we have to overwrite values in the kernel image, which are "rom" */
 136         stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 137         stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 138     }
 139
 140     return 0;
 141 }
 142
 143 static Property s390_ipl_properties[] = {
 144     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 145     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 146     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 147     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 148     DEFINE_PROP_END_OF_LIST(),
 149 };
 150
 151 static void s390_ipl_reset(DeviceState *dev)
 152 {
 153     S390IPLState *ipl = S390_IPL(dev);
 154
 155     s390_ipl_cpu(ipl->start_addr);
 156 }
 157
 158 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 159 {
 160     DeviceClass *dc = DEVICE_CLASS(klass);
 161     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 162
 163     k->init = s390_ipl_init;
 164     dc->props = s390_ipl_properties;
 165     dc->reset = s390_ipl_reset;
 166     dc->no_user = 1;
 167 }
 168
 169 static const TypeInfo s390_ipl_info = {
 170     .class_init = s390_ipl_class_init,
 171     .parent = TYPE_SYS_BUS_DEVICE,
 172     .name  = "s390-ipl",
 173     .instance_size  = sizeof(S390IPLState),
 174 };
 175
 176 static void s390_ipl_register_types(void)
 177 {
 178     type_register_static(&s390_ipl_info);
 179 }
 180
 181 type_init(s390_ipl_register_types)