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/*

 * Copyright (C) 2001-2004 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.

 */

#include <mm/vm.h>

#include <mm/page.h>

#include <mm/frame.h>

#include <mm/tlb.h>

#include <mm/heap.h>

#include <arch/mm/page.h>

#include <arch/types.h>

#include <typedefs.h>

#include <synch/spinlock.h>

#include <config.h>

#include <list.h>

#include <panic.h>

#include <arch/asm.h>

#include <debug.h>

#include <memstr.h>

#include <arch.h>

#define KAS_START_INDEX     PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)

#define KAS_END_INDEX       PTL0_INDEX(KERNEL_ADDRESS_SPACE_END)

#define KAS_INDICES     (1+(KAS_END_INDEX-KAS_START_INDEX))

vm_t *vm_create(pte_t *ptl0)

{

    vm_t *m;

    m = (vm_t *) malloc(sizeof(vm_t));

    if (m) {

        spinlock_initialize(&m->lock);

        list_initialize(&m->vm_area_head);

        /*

         * Each vm_t is supposed to have its own page table.

         * It is either passed one or it has to allocate and set one up.

         */

        m->ptl0 = ptl0;

        if (!m->ptl0) {

            pte_t *src_ptl0, *dst_ptl0;

            src_ptl0 = (pte_t *) PA2KA((__address) GET_PTL0_ADDRESS());

            dst_ptl0 = (pte_t *) frame_alloc(FRAME_KA | FRAME_PANIC);

            /* TODO: in theory, it should be only necessary to copy kernel address space... */

            memcpy((void *)PA2KA((__address) dst_ptl0), (void *)GET_PTL0_ADDRESS() , PAGE_SIZE);

            m->ptl0 = (pte_t *) KA2PA((__address) dst_ptl0);

        }

    }

    return m;

}

void vm_destroy(vm_t *m)

{

}

vm_area_t *vm_area_create(vm_t *m, vm_type_t type, size_t size, __address addr)

{

    pri_t pri;

    vm_area_t *a;

    if (addr % PAGE_SIZE)

        panic("addr not aligned to a page boundary");

    pri = cpu_priority_high();

    spinlock_lock(&m->lock);

    /*

     * TODO: test vm_area which is to be created doesn't overlap with an existing one.

     */

    a = (vm_area_t *) malloc(sizeof(vm_area_t));

    if (a) {

        int i;

        a->mapping = (__address *) malloc(size * sizeof(__address));

        if (!a->mapping) {

            free(a);

            spinlock_unlock(&m->lock);

            cpu_priority_restore(pri);

            return NULL;

        }

        for (i=0; i<size; i++)

            a->mapping[i] = frame_alloc(0);

        spinlock_initialize(&a->lock);

        link_initialize(&a->link);         

        a->type = type;

        a->size = size;

        a->address = addr;

        list_append(&a->link, &m->vm_area_head);

    }

    spinlock_unlock(&m->lock);

    cpu_priority_restore(pri);

    return a;

}

void vm_area_destroy(vm_area_t *a)

{

}

void vm_area_map(vm_area_t *a, vm_t *m)

{

    int i, flags;

    pri_t pri;

    pri = cpu_priority_high();

    spinlock_lock(&m->lock);

    spinlock_lock(&a->lock);

    switch (a->type) {

        case VMA_TEXT:

            flags = PAGE_EXEC | PAGE_READ | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE;

            break;

        case VMA_DATA:

        case VMA_STACK:

            flags = PAGE_READ | PAGE_WRITE | PAGE_USER | PAGE_PRESENT | PAGE_CACHEABLE;

            break;

        default:

            panic("unexpected vm_type_t %d", a->type);

    }

    ASSERT(m->ptl0);

    for (i=0; i<a->size; i++)

        map_page_to_frame(a->address + i*PAGE_SIZE, a->mapping[i], flags, (__address) m->ptl0);

    spinlock_unlock(&a->lock);

    spinlock_unlock(&m->lock);

    cpu_priority_restore(pri);

}

void vm_area_unmap(vm_area_t *a, vm_t *m)

{

    int i;

    pri_t pri;

    pri = cpu_priority_high();

    spinlock_lock(&m->lock);

    spinlock_lock(&a->lock);

    ASSERT(m->ptl0);

    for (i=0; i<a->size; i++)      

        map_page_to_frame(a->address + i*PAGE_SIZE, 0, PAGE_NOT_PRESENT, (__address) m->ptl0);

    spinlock_unlock(&a->lock);

    spinlock_unlock(&m->lock);

    cpu_priority_restore(pri);

}

void vm_install(vm_t *m)

{

    link_t *l;

    pri_t pri;

    pri = cpu_priority_high();

    tlb_shootdown_start();

    spinlock_lock(&m->lock);

    ASSERT(m->ptl0);

    SET_PTL0_ADDRESS(m->ptl0);

    spinlock_unlock(&m->lock);

    tlb_shootdown_finalize();

    cpu_priority_restore(pri);

}