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/*

 * Copyright (c) 2006 Martin Decky

 * 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 ia32xen

 * @{

 */

/** @file

 */

#include <arch.h>

#include <main/main.h>

#include <arch/types.h>

#include <align.h>

#include <arch/pm.h>

#include <arch/drivers/xconsole.h>

#include <arch/mm/page.h>

#include <arch/context.h>

#include <config.h>

#include <arch/interrupt.h>

#include <arch/asm.h>

#include <genarch/acpi/acpi.h>

#include <arch/bios/bios.h>

#include <interrupt.h>

#include <arch/debugger.h>

#include <proc/thread.h>

#include <syscall/syscall.h>

#include <console/console.h>

#include <ddi/irq.h>

start_info_t start_info;

memzone_t meminfo;

extern void xen_callback(void);

extern void xen_failsafe_callback(void);

void arch_pre_main(void)

{

    pte_t pte;

    memsetb(&pte, sizeof(pte), 0);

    pte.present = 1;

    pte.writeable = 1;

    pte.frame_address = ADDR2PFN((uintptr_t) start_info.shared_info);

    ASSERT(xen_update_va_mapping(&shared_info, pte, UVMF_INVLPG) == 0);

    if (!(start_info.flags & SIF_INITDOMAIN)) {

        /* Map console frame */

        pte.present = 1;

        pte.writeable = 1;

        pte.frame_address = start_info.console.domU.mfn;

        ASSERT(xen_update_va_mapping(&console_page, pte, UVMF_INVLPG) == 0);

    } else

        start_info.console.domU.evtchn = 0;

    ASSERT(xen_set_callbacks(XEN_CS, xen_callback, XEN_CS, xen_failsafe_callback) == 0);

    /* Create identity mapping */

    meminfo.start = ADDR2PFN(ALIGN_UP(KA2PA(start_info.ptl0), PAGE_SIZE)) + start_info.pt_frames;

    meminfo.size = start_info.frames - meminfo.start;

    meminfo.reserved = 0;

    uintptr_t pa;

    index_t last_ptl0 = 0;

    for (pa = PFN2ADDR(meminfo.start); pa < PFN2ADDR(meminfo.start + meminfo.size); pa += FRAME_SIZE) {

        uintptr_t va = PA2KA(pa);

        if ((PTL0_INDEX(va) != last_ptl0) && (GET_PTL1_FLAGS(start_info.ptl0, PTL0_INDEX(va)) & PAGE_NOT_PRESENT)) {

            /* New page directory entry needed */

            uintptr_t tpa = PFN2ADDR(meminfo.start + meminfo.reserved);

            uintptr_t tva = PA2KA(tpa);

            memsetb((void *) tva, PAGE_SIZE, 0);

            pte_t *tptl3 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(start_info.ptl0, PTL0_INDEX(tva)));

            SET_FRAME_ADDRESS(tptl3, PTL3_INDEX(tva), 0);

            SET_PTL1_ADDRESS(start_info.ptl0, PTL0_INDEX(va), tpa);

            SET_FRAME_ADDRESS(tptl3, PTL3_INDEX(tva), tpa);

            last_ptl0 = PTL0_INDEX(va);

            meminfo.reserved++;

        }

        pte_t *ptl3 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(start_info.ptl0, PTL0_INDEX(va)));

        SET_FRAME_ADDRESS(ptl3, PTL3_INDEX(va), pa);

        SET_FRAME_FLAGS(ptl3, PTL3_INDEX(va), PAGE_PRESENT | PAGE_WRITE);

    }

    /* Put initial stack safely in the mapped area */

    stack_safe = PA2KA(PFN2ADDR(meminfo.start + meminfo.reserved));

}

void arch_pre_mm_init(void)

{

    pm_init();

    if (config.cpu_active == 1) {

        interrupt_init();

//      bios_init();

    }

}

void arch_post_mm_init(void)

{

    if (config.cpu_active == 1) {

        /* Initialize IRQ routing */

        irq_init(IRQ_COUNT, IRQ_COUNT);

        /* Video */

        xen_console_init();

        /* Enable debugger */

        debugger_init();

        /* Merge all memory zones to 1 big zone */

        zone_merge_all();

    }

}

void arch_post_cpu_init(void)

{

}

void arch_pre_smp_init(void)

{

    if (config.cpu_active == 1) {

#ifdef CONFIG_SMP

        acpi_init();

#endif /* CONFIG_SMP */

    }

}

void arch_post_smp_init(void)

{

}

void calibrate_delay_loop(void)

{

//  i8254_calibrate_delay_loop();

    if (config.cpu_active == 1) {

        /*

         * This has to be done only on UP.

         * On SMP, i8254 is not used for time keeping and its interrupt pin remains masked.

         */

//      i8254_normal_operation();

    }

}

/** Set thread-local-storage pointer

 *

 * TLS pointer is set in GS register. That means, the GS contains

 * selector, and the descriptor->base is the correct address.

 */

unative_t sys_tls_set(unative_t addr)

{

    THREAD->arch.tls = addr;

    set_tls_desc(addr);

    return 0;

}

/** Acquire console back for kernel

 *

 */

void arch_grab_console(void)

{

}

/** Return console to userspace

 *

 */

void arch_release_console(void)

{

}

void arch_reboot(void)

{

    // TODO

    while (1);

}

/** @}

 */