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/*

 * Copyright (c) 2006 Jakub Jermar

 * Copyright (c) 2009 Pavel Rimsky

 * 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 sparc64mm

 * @{

 */

/** @file

 */

#include <arch/mm/as.h>

#include <arch/mm/pagesize.h>

#include <arch/mm/tlb.h>

#include <genarch/mm/page_ht.h>

#include <genarch/mm/asid_fifo.h>

#include <debug.h>

#include <config.h>

#include <arch/sun4v/hypercall.h>

#ifdef CONFIG_TSB

#include <arch/mm/tsb.h>

#include <arch/memstr.h>

#include <arch/asm.h>

#include <mm/frame.h>

#include <bitops.h>

#include <macros.h>

#endif /* CONFIG_TSB */

/** Architecture dependent address space init. */

void as_arch_init(void)

{

    if (config.cpu_active == 1) {

        as_operations = &as_ht_operations;

        asid_fifo_init();

    }

}

int as_constructor_arch(as_t *as, int flags)

{

#ifdef CONFIG_TSB

    int order = fnzb32(

        (TSB_ENTRY_COUNT * sizeof(tsb_entry_t)) >> FRAME_WIDTH);

    uintptr_t tsb = (uintptr_t) frame_alloc(order, flags | FRAME_KA);

    if (!tsb)

        return -1;

    as->arch.tsb_description.page_size = PAGESIZE_8K;

    as->arch.tsb_description.associativity = 1;

    as->arch.tsb_description.num_ttes = TSB_ENTRY_COUNT;

    as->arch.tsb_description.pgsize_mask = 1 << PAGESIZE_8K;

    as->arch.tsb_description.tsb_base = tsb;

    as->arch.tsb_description.reserved = 0;

    memsetb((void *) as->arch.tsb_description.tsb_base,

        TSB_ENTRY_COUNT * sizeof(tsb_entry_t), 0);

#endif

    return 0;

}

int as_destructor_arch(as_t *as)

{

#ifdef CONFIG_TSB

    count_t cnt = (TSB_ENTRY_COUNT * sizeof(tsb_entry_t)) >> FRAME_WIDTH;

    frame_free(KA2PA((uintptr_t) as->arch.tsb_description.tsb_base));

    return cnt;

#else

    return 0;

#endif

}

int as_create_arch(as_t *as, int flags)

{

#ifdef CONFIG_TSB

    tsb_invalidate(as, 0, (count_t) -1);

    as->arch.tsb_description.context = as->asid;

#endif

    return 0;

}

/** Perform sparc64-specific tasks when an address space becomes active on the

 * processor.

 *

 * Install ASID and map TSBs.

 *

 * @param as Address space.

 */

void as_install_arch(as_t *as)

{

    mmu_secondary_context_write(as->asid);

#ifdef CONFIG_TSB   

    uintptr_t base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);

    ASSERT(as->arch.tsb_description.tsb_base);

    uintptr_t tsb = as->arch.tsb_description.tsb_base;

    if (!overlaps(tsb, 8 * MMU_PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {

        /*

         * TSBs were allocated from memory not covered

         * by the locked 4M kernel DTLB entry. We need

         * to map both TSBs explicitly.

         */

        mmu_demap_page(tsb, 0, MMU_FLAG_DTLB);

        mmu_map_perm_addr(

            tsb, KA2PA(tsb), true, true, false, true,

            PAGESIZE_64K, MMU_FLAG_DTLB);

    }

    __hypercall_fast2(MMU_TSB_CTX0, 1, as->arch.tsb_description.tsb_base);

#endif

}

/** Perform sparc64-specific tasks when an address space is removed from the

 * processor.

 *

 * Demap TSBs.

 *

 * @param as Address space.

 */

void as_deinstall_arch(as_t *as)

{

    /*

     * Note that we don't and may not lock the address space. That's ok

     * since we only read members that are currently read-only.

     *

     * Moreover, the as->asid is protected by asidlock, which is being held.

     */

#ifdef CONFIG_TSB

    uintptr_t base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);

    ASSERT(as->arch.tsb_description.tsb_base);

    uintptr_t tsb = as->arch.tsb_description.tsb_base;

    if (!overlaps(tsb, 8 * MMU_PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {

        /*

         * TSBs were allocated from memory not covered

         * by the locked 4M kernel DTLB entry. We need

         * to demap the entry installed by as_install_arch().

         */

        mmu_demap_page(tsb, 0, MMU_FLAG_DTLB);

    }

#endif

}

/** @}

 */