LXR qemu/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 "qemu/osdep.h"
  15#include "qapi/error.h"
  16#include "sysemu/sysemu.h"
  17#include "cpu.h"
  18#include "elf.h"
  19#include "hw/loader.h"
  20#include "hw/s390x/virtio-ccw.h"
  21#include "hw/s390x/css.h"
  22#include "ipl.h"
  23
  24#define KERN_IMAGE_START                0x010000UL
  25#define KERN_PARM_AREA                  0x010480UL
  26#define INITRD_START                    0x800000UL
  27#define INITRD_PARM_START               0x010408UL
  28#define INITRD_PARM_SIZE                0x010410UL
  29#define PARMFILE_START                  0x001000UL
  30#define ZIPL_IMAGE_START                0x009000UL
  31#define IPL_PSW_MASK                    (PSW_MASK_32 | PSW_MASK_64)
  32
  33static const VMStateDescription vmstate_iplb = {
  34    .name = "ipl/iplb",
  35    .version_id = 0,
  36    .minimum_version_id = 0,
  37    .fields = (VMStateField[]) {
  38        VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110),
  39        VMSTATE_UINT16(devno, IplParameterBlock),
  40        VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88),
  41        VMSTATE_END_OF_LIST()
  42    }
  43};
  44
  45static const VMStateDescription vmstate_ipl = {
  46    .name = "ipl",
  47    .version_id = 0,
  48    .minimum_version_id = 0,
  49    .fields = (VMStateField[]) {
  50        VMSTATE_UINT64(start_addr, S390IPLState),
  51        VMSTATE_UINT64(bios_start_addr, S390IPLState),
  52        VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock),
  53        VMSTATE_BOOL(iplb_valid, S390IPLState),
  54        VMSTATE_UINT8(cssid, S390IPLState),
  55        VMSTATE_UINT8(ssid, S390IPLState),
  56        VMSTATE_UINT16(devno, S390IPLState),
  57        VMSTATE_END_OF_LIST()
  58     }
  59};
  60
  61static S390IPLState *get_ipl_device(void)
  62{
  63    return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL));
  64}
  65
  66static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
  67{
  68    uint64_t dstaddr = *(uint64_t *) opaque;
  69    /*
  70     * Assuming that our s390-ccw.img was linked for starting at address 0,
  71     * we can simply add the destination address for the final location
  72     */
  73    return srcaddr + dstaddr;
  74}
  75
  76static void s390_ipl_realize(DeviceState *dev, Error **errp)
  77{
  78    S390IPLState *ipl = S390_IPL(dev);
  79    uint64_t pentry = KERN_IMAGE_START;
  80    int kernel_size;
  81    Error *err = NULL;
  82
  83    int bios_size;
  84    char *bios_filename;
  85
  86    /*
  87     * Always load the bios if it was enforced,
  88     * even if an external kernel has been defined.
  89     */
  90    if (!ipl->kernel || ipl->enforce_bios) {
  91        uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL;
  92
  93        if (bios_name == NULL) {
  94            bios_name = ipl->firmware;
  95        }
  96
  97        bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  98        if (bios_filename == NULL) {
  99            error_setg(&err, "could not find stage1 bootloader");
 100            goto error;
 101        }
 102
 103        bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase,
 104                             &ipl->bios_start_addr, NULL, NULL, 1,
 105                             EM_S390, 0, 0);
 106        if (bios_size > 0) {
 107            /* Adjust ELF start address to final location */
 108            ipl->bios_start_addr += fwbase;
 109        } else {
 110            /* Try to load non-ELF file (e.g. s390-ccw.img) */
 111            bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
 112                                            4096);
 113            ipl->bios_start_addr = ZIPL_IMAGE_START;
 114        }
 115        g_free(bios_filename);
 116
 117        if (bios_size == -1) {
 118            error_setg(&err, "could not load bootloader '%s'", bios_name);
 119            goto error;
 120        }
 121
 122        /* default boot target is the bios */
 123        ipl->start_addr = ipl->bios_start_addr;
 124    }
 125
 126    if (ipl->kernel) {
 127        kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 128                               NULL, 1, EM_S390, 0, 0);
 129        if (kernel_size < 0) {
 130            kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 131        }
 132        if (kernel_size < 0) {
 133            error_setg(&err, "could not load kernel '%s'", ipl->kernel);
 134            goto error;
 135        }
 136        /*
 137         * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 138         * kernel parameters here as well. Note: For old kernels (up to 3.2)
 139         * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 140         * loader) and it won't work. For this case we force it to 0x10000, too.
 141         */
 142        if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 143            ipl->start_addr = KERN_IMAGE_START;
 144            /* Overwrite parameters in the kernel image, which are "rom" */
 145            strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 146        } else {
 147            ipl->start_addr = pentry;
 148        }
 149
 150        if (ipl->initrd) {
 151            ram_addr_t initrd_offset;
 152            int initrd_size;
 153
 154            initrd_offset = INITRD_START;
 155            while (kernel_size + 0x100000 > initrd_offset) {
 156                initrd_offset += 0x100000;
 157            }
 158            initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 159                                              ram_size - initrd_offset);
 160            if (initrd_size == -1) {
 161                error_setg(&err, "could not load initrd '%s'", ipl->initrd);
 162                goto error;
 163            }
 164
 165            /*
 166             * we have to overwrite values in the kernel image,
 167             * which are "rom"
 168             */
 169            stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 170            stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 171        }
 172    }
 173    qemu_register_reset(qdev_reset_all_fn, dev);
 174error:
 175    error_propagate(errp, err);
 176}
 177
 178static Property s390_ipl_properties[] = {
 179    DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 180    DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 181    DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 182    DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 183    DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
 184    DEFINE_PROP_END_OF_LIST(),
 185};
 186
 187/*
 188 * In addition to updating the iplstate, this function returns:
 189 * - 0 if system was ipled with external kernel
 190 * - -1 if no valid boot device was found
 191 * - ccw id of the boot device otherwise
 192 */
 193static uint64_t s390_update_iplstate(S390IPLState *ipl)
 194{
 195    DeviceState *dev_st;
 196
 197    if (ipl->iplb_valid) {
 198        ipl->cssid = 0;
 199        ipl->ssid = 0;
 200        ipl->devno = ipl->iplb.devno;
 201        goto out;
 202    }
 203
 204    if (ipl->kernel) {
 205        return 0;
 206    }
 207
 208    dev_st = get_boot_device(0);
 209    if (dev_st) {
 210        VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast(
 211            OBJECT(qdev_get_parent_bus(dev_st)->parent),
 212                TYPE_VIRTIO_CCW_DEVICE);
 213        if (ccw_dev) {
 214            ipl->cssid = ccw_dev->sch->cssid;
 215            ipl->ssid = ccw_dev->sch->ssid;
 216            ipl->devno = ccw_dev->sch->devno;
 217            goto out;
 218        }
 219    }
 220
 221    return -1;
 222out:
 223    return (uint32_t) (ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno);
 224}
 225
 226void s390_ipl_update_diag308(IplParameterBlock *iplb)
 227{
 228    S390IPLState *ipl = get_ipl_device();
 229
 230    ipl->iplb = *iplb;
 231    ipl->iplb_valid = true;
 232}
 233
 234IplParameterBlock *s390_ipl_get_iplb(void)
 235{
 236    S390IPLState *ipl = get_ipl_device();
 237
 238    if (!ipl->iplb_valid) {
 239        return NULL;
 240    }
 241    return &ipl->iplb;
 242}
 243
 244void s390_reipl_request(void)
 245{
 246    S390IPLState *ipl = get_ipl_device();
 247
 248    ipl->reipl_requested = true;
 249    qemu_system_reset_request();
 250}
 251
 252void s390_ipl_prepare_cpu(S390CPU *cpu)
 253{
 254    S390IPLState *ipl = get_ipl_device();
 255
 256    cpu->env.psw.addr = ipl->start_addr;
 257    cpu->env.psw.mask = IPL_PSW_MASK;
 258
 259    if (!ipl->kernel || ipl->iplb_valid) {
 260        cpu->env.psw.addr = ipl->bios_start_addr;
 261        cpu->env.regs[7] = s390_update_iplstate(ipl);
 262    }
 263}
 264
 265static void s390_ipl_reset(DeviceState *dev)
 266{
 267    S390IPLState *ipl = S390_IPL(dev);
 268
 269    if (!ipl->reipl_requested) {
 270        ipl->iplb_valid = false;
 271    }
 272    ipl->reipl_requested = false;
 273}
 274
 275static void s390_ipl_class_init(ObjectClass *klass, void *data)
 276{
 277    DeviceClass *dc = DEVICE_CLASS(klass);
 278
 279    dc->realize = s390_ipl_realize;
 280    dc->props = s390_ipl_properties;
 281    dc->reset = s390_ipl_reset;
 282    dc->vmsd = &vmstate_ipl;
 283    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 284}
 285
 286static const TypeInfo s390_ipl_info = {
 287    .class_init = s390_ipl_class_init,
 288    .parent = TYPE_DEVICE,
 289    .name  = TYPE_S390_IPL,
 290    .instance_size  = sizeof(S390IPLState),
 291};
 292
 293static void s390_ipl_register_types(void)
 294{
 295    type_register_static(&s390_ipl_info);
 296}
 297
 298type_init(s390_ipl_register_types)
 299