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/*

 * Copyright (c) 2008 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.

 */

/** @addtogroup ia32   

 * @{

 */

/** @file

 */

#include <smp/smp.h>

#include <arch/smp/smp.h>

#include <arch/smp/mps.h>

#include <arch/smp/ap.h>

#include <arch/boot/boot.h>

#include <genarch/acpi/acpi.h>

#include <genarch/acpi/madt.h>

#include <config.h>

#include <synch/waitq.h>

#include <synch/synch.h>

#include <arch/pm.h>

#include <func.h>

#include <panic.h>

#include <debug.h>

#include <arch/asm.h>

#include <mm/frame.h>

#include <mm/page.h>

#include <mm/slab.h>

#include <mm/as.h>

#include <print.h>

#include <memstr.h>

#include <arch/drivers/i8259.h>

#ifdef CONFIG_SMP

static struct smp_config_operations *ops = NULL;

void smp_init(void)

{

    uintptr_t l_apic_address, io_apic_address;

    if (acpi_madt) {

        acpi_madt_parse();

        ops = &madt_config_operations;

    }

    if (config.cpu_count == 1) {

        mps_init();

        ops = &mps_config_operations;

    }

    l_apic_address = (uintptr_t) frame_alloc(ONE_FRAME,

        FRAME_ATOMIC | FRAME_KA);

    if (!l_apic_address)

        panic("cannot allocate address for l_apic\n");

    io_apic_address = (uintptr_t) frame_alloc(ONE_FRAME,

        FRAME_ATOMIC | FRAME_KA);

    if (!io_apic_address)

        panic("cannot allocate address for io_apic\n");

    if (config.cpu_count > 1) {    

        page_mapping_insert(AS_KERNEL, l_apic_address,

            (uintptr_t) l_apic, PAGE_NOT_CACHEABLE | PAGE_WRITE);

        page_mapping_insert(AS_KERNEL, io_apic_address,

            (uintptr_t) io_apic, PAGE_NOT_CACHEABLE | PAGE_WRITE);

        l_apic = (uint32_t *) l_apic_address;

        io_apic = (uint32_t *) io_apic_address;

    }

}

/*

 * Kernel thread for bringing up application processors. It becomes clear

 * that we need an arrangement like this (AP's being initialized by a kernel

 * thread), for a thread has its dedicated stack. (The stack used during the

 * BSP initialization (prior the very first call to scheduler()) will be used

 * as an initialization stack for each AP.)

 */

void kmp(void *arg __attribute__((unused)))

{

    unsigned int i;

    ASSERT(ops != NULL);

    /*

     * We need to access data in frame 0.

     * We boldly make use of kernel address space mapping.

     */

    /*

     * Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()

     */

    *((uint16_t *) (PA2KA(0x467 + 0))) =

        (uint16_t) (((uintptr_t) ap_boot) >> 4);    /* segment */

    *((uint16_t *) (PA2KA(0x467 + 2))) = 0;     /* offset */

    /*

     * Save 0xa to address 0xf of the CMOS RAM.

     * BIOS will not do the POST after the INIT signal.

     */

    outb(0x70, 0xf);

    outb(0x71, 0xa);

    pic_disable_irqs(0xffff);

    apic_init();

    uint8_t apic = l_apic_id();

    for (i = 0; i < ops->cpu_count(); i++) {

        struct descriptor *gdt_new;

        /*

         * Skip processors marked unusable.

         */

        if (!ops->cpu_enabled(i))

            continue;

        /*

         * The bootstrap processor is already up.

         */

        if (ops->cpu_bootstrap(i))

            continue;

        if (ops->cpu_apic_id(i) == apic) {

            printf("%s: bad processor entry #%u, will not send IPI "

                "to myself\n", __FUNCTION__, i);

            continue;

        }

        /*

         * Prepare new GDT for CPU in question.

         */

        gdt_new = (struct descriptor *) malloc(GDT_ITEMS *

            sizeof(struct descriptor), FRAME_ATOMIC);

        if (!gdt_new)

            panic("couldn't allocate memory for GDT\n");

        memcpy(gdt_new, gdt, GDT_ITEMS * sizeof(struct descriptor));

        memsetb((uintptr_t)(&gdt_new[TSS_DES]),

            sizeof(struct descriptor), 0);

        protected_ap_gdtr.limit = GDT_ITEMS * sizeof(struct descriptor);

        protected_ap_gdtr.base = KA2PA((uintptr_t) gdt_new);

        gdtr.base = (uintptr_t) gdt_new;

        if (l_apic_send_init_ipi(ops->cpu_apic_id(i))) {

            /*

             * There may be just one AP being initialized at

             * the time. After it comes completely up, it is

             * supposed to wake us up.

             */

            if (waitq_sleep_timeout(&ap_completion_wq, 1000000,

                SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT) {

                unsigned int cpu = (config.cpu_active > i) ?

                    config.cpu_active : i;

                printf("%s: waiting for cpu%u (APIC ID = %d) "

                    "timed out\n", __FUNCTION__, cpu,

                    ops->cpu_apic_id(i));

            }

        } else

            printf("INIT IPI for l_apic%d failed\n",

                ops->cpu_apic_id(i));

    }

}

int smp_irq_to_pin(unsigned int irq)

{

    ASSERT(ops != NULL);

    return ops->irq_to_pin(irq);

}

#endif /* CONFIG_SMP */

/** @}

 */