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/*

 * QEMU S390 virtio target

 *

 * Copyright (c) 2009 Alexander Graf <agraf@suse.de>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#include "hw.h"

#include "block.h"

#include "blockdev.h"

#include "sysemu.h"

#include "net.h"

#include "boards.h"

#include "monitor.h"

#include "loader.h"

#include "elf.h"

#include "hw/virtio.h"

#include "hw/sysbus.h"

#include "kvm.h"

#include "exec-memory.h"

#include "hw/s390-virtio-bus.h"

//#define DEBUG_S390

#ifdef DEBUG_S390

#define dprintf(fmt, ...) \

    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)

#else

#define dprintf(fmt, ...) \

    do { } while (0)

#endif

#define KVM_S390_VIRTIO_NOTIFY          0

#define KVM_S390_VIRTIO_RESET           1

#define KVM_S390_VIRTIO_SET_STATUS      2

#define KERN_IMAGE_START                0x010000UL

#define KERN_PARM_AREA                  0x010480UL

#define INITRD_START                    0x800000UL

#define INITRD_PARM_START               0x010408UL

#define INITRD_PARM_SIZE                0x010410UL

#define PARMFILE_START                  0x001000UL

#define ZIPL_START                        0x009000UL

#define ZIPL_LOAD_ADDR                        0x009000UL

#define ZIPL_FILENAME                        "s390-zipl.rom"

#define MAX_BLK_DEVS                    10

static VirtIOS390Bus *s390_bus;

static CPUState **ipi_states;

CPUState *s390_cpu_addr2state(uint16_t cpu_addr)

{

    if (cpu_addr >= smp_cpus) {

        return NULL;

    }

    return ipi_states[cpu_addr];

}

int s390_virtio_hypercall(CPUState *env, uint64_t mem, uint64_t hypercall)

{

    int r = 0, i;

    dprintf("KVM hypercall: %ld\n", hypercall);

    switch (hypercall) {

    case KVM_S390_VIRTIO_NOTIFY:

        if (mem > ram_size) {

            VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,

                                                               mem, &i);

            if (dev) {

                virtio_queue_notify(dev->vdev, i);

            } else {

                r = -EINVAL;

            }

        } else {

            /* Early printk */

        }

        break;

    case KVM_S390_VIRTIO_RESET:

    {

        VirtIOS390Device *dev;

        dev = s390_virtio_bus_find_mem(s390_bus, mem);

        virtio_reset(dev->vdev);

        stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);

        s390_virtio_device_sync(dev);

        break;

    }

    case KVM_S390_VIRTIO_SET_STATUS:

    {

        VirtIOS390Device *dev;

        dev = s390_virtio_bus_find_mem(s390_bus, mem);

        if (dev) {

            s390_virtio_device_update_status(dev);

        } else {

            r = -EINVAL;

        }

        break;

    }

    default:

        r = -EINVAL;

        break;

    }

    return r;

}

/*

 * The number of running CPUs. On s390 a shutdown is the state of all CPUs

 * being either stopped or disabled (for interrupts) waiting. We have to

 * track this number to call the shutdown sequence accordingly. This

 * number is modified either on startup or while holding the big qemu lock.

 */

static unsigned s390_running_cpus;

void s390_add_running_cpu(CPUState *env)

{

    if (env->halted) {

        s390_running_cpus++;

        env->halted = 0;

        env->exception_index = -1;

    }

}

unsigned s390_del_running_cpu(CPUState *env)

{

    if (env->halted == 0) {

        assert(s390_running_cpus >= 1);

        s390_running_cpus--;

        env->halted = 1;

        env->exception_index = EXCP_HLT;

    }

    return s390_running_cpus;

}

/* PC hardware initialisation */

static void s390_init(ram_addr_t my_ram_size,

                      const char *boot_device,

                      const char *kernel_filename,

                      const char *kernel_cmdline,

                      const char *initrd_filename,

                      const char *cpu_model)

{

    CPUState *env = NULL;

    MemoryRegion *sysmem = get_system_memory();

    MemoryRegion *ram = g_new(MemoryRegion, 1);

    ram_addr_t kernel_size = 0;

    ram_addr_t initrd_offset;

    ram_addr_t initrd_size = 0;

    int shift = 0;

    uint8_t *storage_keys;

    void *virtio_region;

    target_phys_addr_t virtio_region_len;

    target_phys_addr_t virtio_region_start;

    int i;

    /* s390x ram size detection needs a 16bit multiplier + an increment. So

       guests > 64GB can be specified in 2MB steps etc. */

    while ((my_ram_size >> (20 + shift)) > 65535) {

        shift++;

    }

    my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);

    /* lets propagate the changed ram size into the global variable. */

    ram_size = my_ram_size;

    /* get a BUS */

    s390_bus = s390_virtio_bus_init(&my_ram_size);

    /* allocate RAM */

    memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size);

    memory_region_add_subregion(sysmem, 0, ram);

    /* clear virtio region */

    virtio_region_len = my_ram_size - ram_size;

    virtio_region_start = ram_size;

    virtio_region = cpu_physical_memory_map(virtio_region_start,

                                            &virtio_region_len, true);

    memset(virtio_region, 0, virtio_region_len);

    cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,

                              virtio_region_len);

    /* allocate storage keys */

    storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);

    /* init CPUs */

    if (cpu_model == NULL) {

        cpu_model = "host";

    }

    ipi_states = g_malloc(sizeof(CPUState *) * smp_cpus);

    for (i = 0; i < smp_cpus; i++) {

        CPUState *tmp_env;

        tmp_env = cpu_init(cpu_model);

        if (!env) {

            env = tmp_env;

        }

        ipi_states[i] = tmp_env;

        tmp_env->halted = 1;

        tmp_env->exception_index = EXCP_HLT;

        tmp_env->storage_keys = storage_keys;

    }

    /* One CPU has to run */

    s390_add_running_cpu(env);

    if (kernel_filename) {

        kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));

        if (lduw_be_phys(KERN_IMAGE_START) != 0x0dd0) {

            fprintf(stderr, "Specified image is not an s390 boot image\n");

            exit(1);

        }

        env->psw.addr = KERN_IMAGE_START;

        env->psw.mask = 0x0000000180000000ULL;

    } else {

        ram_addr_t bios_size = 0;

        char *bios_filename;

        /* Load zipl bootloader */

        if (bios_name == NULL) {

            bios_name = ZIPL_FILENAME;

        }

        bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);

        bios_size = load_image(bios_filename, qemu_get_ram_ptr(ZIPL_LOAD_ADDR));

        g_free(bios_filename);

        if ((long)bios_size < 0) {

            hw_error("could not load bootloader '%s'\n", bios_name);

        }

        if (bios_size > 4096) {

            hw_error("stage1 bootloader is > 4k\n");

        }

        env->psw.addr = ZIPL_START;

        env->psw.mask = 0x0000000180000000ULL;

    }

    if (initrd_filename) {

        initrd_offset = INITRD_START;

        while (kernel_size + 0x100000 > initrd_offset) {

            initrd_offset += 0x100000;

        }

        initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));

        stq_be_phys(INITRD_PARM_START, initrd_offset);

        stq_be_phys(INITRD_PARM_SIZE, initrd_size);

    }

    if (kernel_cmdline) {

        cpu_physical_memory_write(KERN_PARM_AREA, kernel_cmdline,

                                  strlen(kernel_cmdline) + 1);

    }

    /* Create VirtIO network adapters */

    for(i = 0; i < nb_nics; i++) {

        NICInfo *nd = &nd_table[i];

        DeviceState *dev;

        if (!nd->model) {

            nd->model = g_strdup("virtio");

        }

        if (strcmp(nd->model, "virtio")) {

            fprintf(stderr, "S390 only supports VirtIO nics\n");

            exit(1);

        }

        dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");

        qdev_set_nic_properties(dev, nd);

        qdev_init_nofail(dev);

    }

    /* Create VirtIO disk drives */

    for(i = 0; i < MAX_BLK_DEVS; i++) {

        DriveInfo *dinfo;

        DeviceState *dev;

        dinfo = drive_get(IF_IDE, 0, i);

        if (!dinfo) {

            continue;

        }

        dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");

        qdev_prop_set_drive_nofail(dev, "drive", dinfo->bdrv);

        qdev_init_nofail(dev);

    }

}

static QEMUMachine s390_machine = {

    .name = "s390-virtio",

    .alias = "s390",

    .desc = "VirtIO based S390 machine",

    .init = s390_init,

    .no_serial = 1,

    .no_parallel = 1,

    .use_virtcon = 1,

    .no_vga = 1,

    .max_cpus = 255,

    .is_default = 1,

};

static void s390_machine_init(void)

{

    qemu_register_machine(&s390_machine);

}

machine_init(s390_machine_init);