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/*

 * Copyright (C) 2005 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/**

 * @file    madt.c

 * @brief   Multiple APIC Description Table (MADT) parsing.

 */

#include <arch/types.h>

#include <typedefs.h>

#include <genarch/acpi/acpi.h>

#include <genarch/acpi/madt.h>

#include <arch/smp/apic.h>

#include <arch/smp/smp.h>

#include <panic.h>

#include <debug.h>

#include <config.h>

#include <print.h>

#include <mm/slab.h>

#include <memstr.h>

#include <sort.h>

struct acpi_madt *acpi_madt = NULL;

#ifdef CONFIG_SMP

/** Standard ISA IRQ map; can be overriden by Interrupt Source Override entries of MADT. */

int isa_irq_map[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };

static void madt_l_apic_entry(struct madt_l_apic *la, __u32 index);

static void madt_io_apic_entry(struct madt_io_apic *ioa, __u32 index);

static void madt_intr_src_ovrd_entry(struct madt_intr_src_ovrd *override, __u32 index);

static int madt_cmp(void * a, void * b);

struct madt_l_apic *madt_l_apic_entries = NULL;

struct madt_io_apic *madt_io_apic_entries = NULL;

index_t madt_l_apic_entry_index = 0;

index_t madt_io_apic_entry_index = 0;

count_t madt_l_apic_entry_cnt = 0;

count_t madt_io_apic_entry_cnt = 0;

count_t cpu_count = 0;

struct madt_apic_header * * madt_entries_index = NULL;

int madt_entries_index_cnt = 0;

char *entry[] = {

    "L_APIC",

    "IO_APIC",

    "INTR_SRC_OVRD",

    "NMI_SRC",

    "L_APIC_NMI",

    "L_APIC_ADDR_OVRD",

    "IO_SAPIC",

    "L_SAPIC",

    "PLATFORM_INTR_SRC"

};

/*

 * ACPI MADT Implementation of SMP configuration interface.

 */

static count_t madt_cpu_count(void);

static bool madt_cpu_enabled(index_t i);

static bool madt_cpu_bootstrap(index_t i);

static __u8 madt_cpu_apic_id(index_t i);

static int madt_irq_to_pin(int irq);

struct smp_config_operations madt_config_operations = {

    .cpu_count = madt_cpu_count,

    .cpu_enabled = madt_cpu_enabled,

    .cpu_bootstrap = madt_cpu_bootstrap,

    .cpu_apic_id = madt_cpu_apic_id,

    .irq_to_pin = madt_irq_to_pin

};

count_t madt_cpu_count(void)

{

    return madt_l_apic_entry_cnt;

}

bool madt_cpu_enabled(index_t i)

{

    ASSERT(i < madt_l_apic_entry_cnt);

    return ((struct madt_l_apic *) madt_entries_index[madt_l_apic_entry_index + i])->flags & 0x1;

}

bool madt_cpu_bootstrap(index_t i)

{

    ASSERT(i < madt_l_apic_entry_cnt);

    return ((struct madt_l_apic *) madt_entries_index[madt_l_apic_entry_index + i])->apic_id == l_apic_id();

}

__u8 madt_cpu_apic_id(index_t i)

{

    ASSERT(i < madt_l_apic_entry_cnt);

    return ((struct madt_l_apic *) madt_entries_index[madt_l_apic_entry_index + i])->apic_id;

}

int madt_irq_to_pin(int irq)

{

    ASSERT(irq < sizeof(isa_irq_map)/sizeof(int));

        return isa_irq_map[irq];

}

int madt_cmp(void * a, void * b)

{

    return

        (((struct madt_apic_header *) a)->type > ((struct madt_apic_header *) b)->type) ?

        1 :

        ((((struct madt_apic_header *) a)->type < ((struct madt_apic_header *) b)->type) ? -1 : 0);

}

void acpi_madt_parse(void)

{

    struct madt_apic_header *end = (struct madt_apic_header *) (((__u8 *) acpi_madt) + acpi_madt->header.length);

    struct madt_apic_header *h;

        l_apic = (__u32 *) (__native) acpi_madt->l_apic_address;

    /* calculate madt entries */

    for (h = &acpi_madt->apic_header[0]; h < end; h = (struct madt_apic_header *) (((__u8 *) h) + h->length)) {

        madt_entries_index_cnt++;

    }

    /* create madt apic entries index array */

    madt_entries_index = (struct madt_apic_header * *) malloc(madt_entries_index_cnt * sizeof(struct madt_apic_header * *), FRAME_ATOMIC);

    if (!madt_entries_index)

        panic("Memory allocation error.");

    __u32 index = 0;

    for (h = &acpi_madt->apic_header[0]; h < end; h = (struct madt_apic_header *) (((__u8 *) h) + h->length)) {

        madt_entries_index[index++] = h;

    }

    /* Quicksort MADT index structure */

    qsort(madt_entries_index, madt_entries_index_cnt, sizeof(__address), &madt_cmp);

    /* Parse MADT entries */   

    for (index = 0; index < madt_entries_index_cnt - 1; index++) {

        h = madt_entries_index[index];

        switch (h->type) {

            case MADT_L_APIC:

                madt_l_apic_entry((struct madt_l_apic *) h, index);

                break;

            case MADT_IO_APIC:

                madt_io_apic_entry((struct madt_io_apic *) h, index);

                break;

            case MADT_INTR_SRC_OVRD:

                madt_intr_src_ovrd_entry((struct madt_intr_src_ovrd *) h, index);

                break;

            case MADT_NMI_SRC:

            case MADT_L_APIC_NMI:

            case MADT_L_APIC_ADDR_OVRD:

            case MADT_IO_SAPIC:

            case MADT_L_SAPIC:

            case MADT_PLATFORM_INTR_SRC:

                printf("MADT: skipping %s entry (type=%zd)\n", entry[h->type], h->type);

                break;

            default:

                if (h->type >= MADT_RESERVED_SKIP_BEGIN && h->type <= MADT_RESERVED_SKIP_END) {

                    printf("MADT: skipping reserved entry (type=%zd)\n", h->type);

                }

                if (h->type >= MADT_RESERVED_OEM_BEGIN) {

                    printf("MADT: skipping OEM entry (type=%zd)\n", h->type);

                }

                break;

        }

    }

    if (cpu_count)

        config.cpu_count = cpu_count;

}

void madt_l_apic_entry(struct madt_l_apic *la, __u32 index)

{

    if (!madt_l_apic_entry_cnt++) {

        madt_l_apic_entry_index = index;

    }

    if (!(la->flags & 0x1)) {

        /* Processor is unusable, skip it. */

        return;

    }

    cpu_count++;   

    apic_id_mask |= 1<<la->apic_id;

}

void madt_io_apic_entry(struct madt_io_apic *ioa, __u32 index)

{

    if (!madt_io_apic_entry_cnt++) {

        /* remember index of the first io apic entry */

        madt_io_apic_entry_index = index;

        io_apic = (__u32 *) (__native) ioa->io_apic_address;

    } else {

        /* currently not supported */

        return;

    }

}

void madt_intr_src_ovrd_entry(struct madt_intr_src_ovrd *override, __u32 index)

{

    ASSERT(override->source < sizeof(isa_irq_map)/sizeof(int));

    printf("MADT: ignoring %s entry: bus=%zd, source=%zd, global_int=%zd, flags=%#hX\n",

        entry[override->header.type], override->bus, override->source,

        override->global_int, override->flags);

}

#endif /* CONFIG_SMP */