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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 "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 "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 MAX_BLK_DEVS                    10

static VirtIOS390Bus *s390_bus;

static CPUState **ipi_states;

void irq_info(Monitor *mon);

void pic_info(Monitor *mon);

void irq_info(Monitor *mon)

{

}

void pic_info(Monitor *mon)

{

}

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)

{

    int r = 0, i;

    target_ulong mem = env->regs[2];

    dprintf("KVM hypercall: %ld\n", env->regs[1]);

    switch (env->regs[1]) {

    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:

    {

        /* Virtio_reset resets the internal addresses, so we'd have to sync

           them up again. We don't want to reallocate a vring though, so let's

           just not reset. */

        /* virtio_reset(dev->vdev); */

        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;

    }

    env->regs[2] = r;

    return 0;

}

/* PC hardware initialisation */

static void s390_init(ram_addr_t 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;

    ram_addr_t ram_addr;

    ram_addr_t kernel_size = 0;

    ram_addr_t initrd_offset;

    ram_addr_t initrd_size = 0;

    int i;

    /* XXX we only work on KVM for now */

    if (!kvm_enabled()) {

        fprintf(stderr, "The S390 target only works with KVM enabled\n");

        exit(1);

    }

    /* get a BUS */

    s390_bus = s390_virtio_bus_init(&ram_size);

    /* allocate RAM */

    ram_addr = qemu_ram_alloc(ram_size);

    cpu_register_physical_memory(0, ram_size, ram_addr);

    /* init CPUs */

    if (cpu_model == NULL) {

        cpu_model = "host";

    }

    ipi_states = qemu_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;

    }

    env->halted = 0;

    env->exception_index = 0;

    if (kernel_filename) {

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

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

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

            exit(1);

        }

        cpu_synchronize_state(env);

        env->psw.addr = KERN_IMAGE_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_phys(INITRD_PARM_START, initrd_offset);

        stq_phys(INITRD_PARM_SIZE, initrd_size);

    }

    if (kernel_cmdline) {

        cpu_physical_memory_rw(KERN_PARM_AREA, (uint8_t *)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 = qemu_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(dev, "drive", dinfo);

        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);