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/*

 *  ioapic.c IOAPIC emulation logic

 *

 *  Copyright (c) 2004-2005 Fabrice Bellard

 *

 *  Split the ioapic logic from apic.c

 *  Xiantao Zhang <xiantao.zhang@intel.com>

 *

 * 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 "pc.h"

#include "apic.h"

#include "ioapic.h"

#include "ioapic_internal.h"

//#define DEBUG_IOAPIC

#ifdef DEBUG_IOAPIC

#define DPRINTF(fmt, ...)                                       \

    do { printf("ioapic: " fmt , ## __VA_ARGS__); } while (0)

#else

#define DPRINTF(fmt, ...)

#endif

static IOAPICCommonState *ioapics[MAX_IOAPICS];

static void ioapic_service(IOAPICCommonState *s)

{

    uint8_t i;

    uint8_t trig_mode;

    uint8_t vector;

    uint8_t delivery_mode;

    uint32_t mask;

    uint64_t entry;

    uint8_t dest;

    uint8_t dest_mode;

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

        mask = 1 << i;

        if (s->irr & mask) {

            entry = s->ioredtbl[i];

            if (!(entry & IOAPIC_LVT_MASKED)) {

                trig_mode = ((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1);

                dest = entry >> IOAPIC_LVT_DEST_SHIFT;

                dest_mode = (entry >> IOAPIC_LVT_DEST_MODE_SHIFT) & 1;

                delivery_mode =

                    (entry >> IOAPIC_LVT_DELIV_MODE_SHIFT) & IOAPIC_DM_MASK;

                if (trig_mode == IOAPIC_TRIGGER_EDGE) {

                    s->irr &= ~mask;

                } else {

                    s->ioredtbl[i] |= IOAPIC_LVT_REMOTE_IRR;

                }

                if (delivery_mode == IOAPIC_DM_EXTINT) {

                    vector = pic_read_irq(isa_pic);

                } else {

                    vector = entry & IOAPIC_VECTOR_MASK;

                }

                apic_deliver_irq(dest, dest_mode, delivery_mode,

                                 vector, trig_mode);

            }

        }

    }

}

static void ioapic_set_irq(void *opaque, int vector, int level)

{

    IOAPICCommonState *s = opaque;

    /* ISA IRQs map to GSI 1-1 except for IRQ0 which maps

     * to GSI 2.  GSI maps to ioapic 1-1.  This is not

     * the cleanest way of doing it but it should work. */

    DPRINTF("%s: %s vec %x\n", __func__, level ? "raise" : "lower", vector);

    if (vector == 0) {

        vector = 2;

    }

    if (vector >= 0 && vector < IOAPIC_NUM_PINS) {

        uint32_t mask = 1 << vector;

        uint64_t entry = s->ioredtbl[vector];

        if (entry & (1 << IOAPIC_LVT_POLARITY_SHIFT)) {

            level = !level;

        }

        if (((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1) ==

            IOAPIC_TRIGGER_LEVEL) {

            /* level triggered */

            if (level) {

                s->irr |= mask;

                ioapic_service(s);

            } else {

                s->irr &= ~mask;

            }

        } else {

            /* According to the 82093AA manual, we must ignore edge requests

             * if the input pin is masked. */

            if (level && !(entry & IOAPIC_LVT_MASKED)) {

                s->irr |= mask;

                ioapic_service(s);

            }

        }

    }

}

void ioapic_eoi_broadcast(int vector)

{

    IOAPICCommonState *s;

    uint64_t entry;

    int i, n;

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

        s = ioapics[i];

        if (!s) {

            continue;

        }

        for (n = 0; n < IOAPIC_NUM_PINS; n++) {

            entry = s->ioredtbl[n];

            if ((entry & IOAPIC_LVT_REMOTE_IRR)

                && (entry & IOAPIC_VECTOR_MASK) == vector) {

                s->ioredtbl[n] = entry & ~IOAPIC_LVT_REMOTE_IRR;

                if (!(entry & IOAPIC_LVT_MASKED) && (s->irr & (1 << n))) {

                    ioapic_service(s);

                }

            }

        }

    }

}

static uint64_t

ioapic_mem_read(void *opaque, target_phys_addr_t addr, unsigned int size)

{

    IOAPICCommonState *s = opaque;

    int index;

    uint32_t val = 0;

    switch (addr & 0xff) {

    case IOAPIC_IOREGSEL:

        val = s->ioregsel;

        break;

    case IOAPIC_IOWIN:

        if (size != 4) {

            break;

        }

        switch (s->ioregsel) {

        case IOAPIC_REG_ID:

            val = s->id << IOAPIC_ID_SHIFT;

            break;

        case IOAPIC_REG_VER:

            val = IOAPIC_VERSION |

                ((IOAPIC_NUM_PINS - 1) << IOAPIC_VER_ENTRIES_SHIFT);

            break;

        case IOAPIC_REG_ARB:

            val = 0;

            break;

        default:

            index = (s->ioregsel - IOAPIC_REG_REDTBL_BASE) >> 1;

            if (index >= 0 && index < IOAPIC_NUM_PINS) {

                if (s->ioregsel & 1) {

                    val = s->ioredtbl[index] >> 32;

                } else {

                    val = s->ioredtbl[index] & 0xffffffff;

                }

            }

        }

        DPRINTF("read: %08x = %08x\n", s->ioregsel, val);

        break;

    }

    return val;

}

static void

ioapic_mem_write(void *opaque, target_phys_addr_t addr, uint64_t val,

                 unsigned int size)

{

    IOAPICCommonState *s = opaque;

    int index;

    switch (addr & 0xff) {

    case IOAPIC_IOREGSEL:

        s->ioregsel = val;

        break;

    case IOAPIC_IOWIN:

        if (size != 4) {

            break;

        }

        DPRINTF("write: %08x = %08x\n", s->ioregsel, val);

        switch (s->ioregsel) {

        case IOAPIC_REG_ID:

            s->id = (val >> IOAPIC_ID_SHIFT) & IOAPIC_ID_MASK;

            break;

        case IOAPIC_REG_VER:

        case IOAPIC_REG_ARB:

            break;

        default:

            index = (s->ioregsel - IOAPIC_REG_REDTBL_BASE) >> 1;

            if (index >= 0 && index < IOAPIC_NUM_PINS) {

                if (s->ioregsel & 1) {

                    s->ioredtbl[index] &= 0xffffffff;

                    s->ioredtbl[index] |= (uint64_t)val << 32;

                } else {

                    s->ioredtbl[index] &= ~0xffffffffULL;

                    s->ioredtbl[index] |= val;

                }

                ioapic_service(s);

            }

        }

        break;

    }

}

static const MemoryRegionOps ioapic_io_ops = {

    .read = ioapic_mem_read,

    .write = ioapic_mem_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

};

static void ioapic_init(IOAPICCommonState *s, int instance_no)

{

    memory_region_init_io(&s->io_memory, &ioapic_io_ops, s, "ioapic", 0x1000);

    qdev_init_gpio_in(&s->busdev.qdev, ioapic_set_irq, IOAPIC_NUM_PINS);

    ioapics[instance_no] = s;

}

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

{

    IOAPICCommonClass *k = IOAPIC_COMMON_CLASS(klass);

    DeviceClass *dc = DEVICE_CLASS(klass);

    k->init = ioapic_init;

    dc->reset = ioapic_reset_common;

}

static TypeInfo ioapic_info = {

    .name          = "ioapic",

    .parent        = TYPE_IOAPIC_COMMON,

    .instance_size = sizeof(IOAPICCommonState),

    .class_init    = ioapic_class_init,

};

static void ioapic_register_types(void)

{

    type_register_static(&ioapic_info);

}

type_init(ioapic_register_types)