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/*

 * SCLP Support

 *

 * Copyright IBM, Corp. 2012

 *

 * Authors:

 *  Christian Borntraeger <borntraeger@de.ibm.com>

 *  Heinz Graalfs <graalfs@linux.vnet.ibm.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or (at your

 * option) any later version.  See the COPYING file in the top-level directory.

 *

 */

#include "cpu.h"

#include "sysemu/kvm.h"

#include "exec/memory.h"

#include "sclp.h"

static inline S390SCLPDevice *get_event_facility(void)

{

    ObjectProperty *op = object_property_find(qdev_get_machine(),

                                              "s390-sclp-event-facility",

                                              NULL);

    assert(op);

    return op->opaque;

}

/* Provide information about the configuration, CPUs and storage */

static void read_SCP_info(SCCB *sccb)

{

    ReadInfo *read_info = (ReadInfo *) sccb;

    int shift = 0;

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

        shift++;

    }

    read_info->rnmax = cpu_to_be16(ram_size >> (20 + shift));

    read_info->rnsize = 1 << shift;

    sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);

}

static void sclp_execute(SCCB *sccb, uint64_t code)

{

    S390SCLPDevice *sdev = get_event_facility();

    switch (code) {

    case SCLP_CMDW_READ_SCP_INFO:

    case SCLP_CMDW_READ_SCP_INFO_FORCED:

        read_SCP_info(sccb);

        break;

    default:

        sdev->sclp_command_handler(sdev->ef, sccb, code);

        break;

    }

}

int sclp_service_call(uint32_t sccb, uint64_t code)

{

    int r = 0;

    SCCB work_sccb;

    hwaddr sccb_len = sizeof(SCCB);

    /* first some basic checks on program checks */

    if (cpu_physical_memory_is_io(sccb)) {

        r = -PGM_ADDRESSING;

        goto out;

    }

    if (sccb & ~0x7ffffff8ul) {

        r = -PGM_SPECIFICATION;

        goto out;

    }

    /*

     * we want to work on a private copy of the sccb, to prevent guests

     * from playing dirty tricks by modifying the memory content after

     * the host has checked the values

     */

    cpu_physical_memory_read(sccb, &work_sccb, sccb_len);

    /* Valid sccb sizes */

    if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||

        be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {

        r = -PGM_SPECIFICATION;

        goto out;

    }

    sclp_execute((SCCB *)&work_sccb, code);

    cpu_physical_memory_write(sccb, &work_sccb,

                              be16_to_cpu(work_sccb.h.length));

    sclp_service_interrupt(sccb);

out:

    return r;

}

void sclp_service_interrupt(uint32_t sccb)

{

    S390SCLPDevice *sdev = get_event_facility();

    uint32_t param = sccb & ~3;

    /* Indicate whether an event is still pending */

    param |= sdev->event_pending(sdev->ef) ? 1 : 0;

    if (!param) {

        /* No need to send an interrupt, there's nothing to be notified about */

        return;

    }

    s390_sclp_extint(param);

}

/* qemu object creation and initialization functions */

void s390_sclp_init(void)

{

    DeviceState *dev  = qdev_create(NULL, "s390-sclp-event-facility");

    object_property_add_child(qdev_get_machine(), "s390-sclp-event-facility",

                              OBJECT(dev), NULL);

    qdev_init_nofail(dev);

}

static int s390_sclp_dev_init(SysBusDevice *dev)

{

    int r;

    S390SCLPDevice *sdev = (S390SCLPDevice *)dev;

    S390SCLPDeviceClass *sclp = SCLP_S390_DEVICE_GET_CLASS(dev);

    r = sclp->init(sdev);

    if (!r) {

        assert(sdev->event_pending);

        assert(sdev->sclp_command_handler);

    }

    return r;

}

static void s390_sclp_device_class_init(ObjectClass *klass, void *data)

{

    SysBusDeviceClass *dc = SYS_BUS_DEVICE_CLASS(klass);

    dc->init = s390_sclp_dev_init;

}

static TypeInfo s390_sclp_device_info = {

    .name = TYPE_DEVICE_S390_SCLP,

    .parent = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(S390SCLPDevice),

    .class_init = s390_sclp_device_class_init,

    .class_size = sizeof(S390SCLPDeviceClass),

    .abstract = true,

};

static void s390_sclp_register_types(void)

{

    type_register_static(&s390_sclp_device_info);

}

type_init(s390_sclp_register_types)