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/*

 * Copyright (c) 2006 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 sparc64mm

 * @{

 */

/** @file

 */

#include <arch/mm/as.h>

#include <arch/mm/tlb.h>

#include <genarch/mm/page_ht.h>

#include <genarch/mm/asid_fifo.h>

#include <debug.h>

#include <config.h>

#ifdef CONFIG_TSB

#include <arch/mm/tsb.h>

#include <arch/memstr.h>

#include <synch/mutex.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

    /*

     * The order must be calculated with respect to the emulated

     * 16K page size.

     */

    int order = fnzb32(((ITSB_ENTRY_COUNT + DTSB_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.itsb = (tsb_entry_t *) tsb;

    as->arch.dtsb = (tsb_entry_t *) (tsb + ITSB_ENTRY_COUNT *

        sizeof(tsb_entry_t));

    memsetb((uintptr_t) as->arch.itsb,

        (ITSB_ENTRY_COUNT + DTSB_ENTRY_COUNT) * sizeof(tsb_entry_t), 0);

#endif

    return 0;

}

int as_destructor_arch(as_t *as)

{

#ifdef CONFIG_TSB

    /*

     * The count must be calculated with respect to the emualted 16K page

     * size.

     */

    count_t cnt = ((ITSB_ENTRY_COUNT + DTSB_ENTRY_COUNT) *

        sizeof(tsb_entry_t)) >> FRAME_WIDTH;

    frame_free(KA2PA((uintptr_t) as->arch.itsb));

    return cnt;

#else

    return 0;

#endif

}

int as_create_arch(as_t *as, int flags)

{

#ifdef CONFIG_TSB

    ipl_t ipl;

    ipl = interrupts_disable();

    mutex_lock_active(&as->lock);   /* completely unnecessary, but polite */

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

    mutex_unlock(&as->lock);

    interrupts_restore(ipl);

#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)

{

    tlb_context_reg_t ctx;

    /*

     * Note that we don't lock the address space.

     * That's correct - we can afford it here

     * because we only read members that are

     * currently read-only.

     */

    /*

     * Write ASID to secondary context register.

     * The primary context register has to be set

     * from TL>0 so it will be filled from the

     * secondary context register from the TL=1

     * code just before switch to userspace.

     */

    ctx.v = 0;

    ctx.context = as->asid;

    mmu_secondary_context_write(ctx.v);

#ifdef CONFIG_TSB   

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

    ASSERT(as->arch.itsb && as->arch.dtsb);

    uintptr_t tsb = (uintptr_t) as->arch.itsb;

    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.

         */

        dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, tsb);

        dtlb_insert_mapping(tsb, KA2PA(tsb), PAGESIZE_64K, true, true);

    }

    /*

     * Setup TSB Base registers.

     */

    tsb_base_reg_t tsb_base;

    tsb_base.value = 0;

    tsb_base.size = TSB_SIZE;

    tsb_base.split = 0;

    tsb_base.base = ((uintptr_t) as->arch.itsb) >> MMU_PAGE_WIDTH;

    itsb_base_write(tsb_base.value);

    tsb_base.base = ((uintptr_t) as->arch.dtsb) >> MMU_PAGE_WIDTH;

    dtsb_base_write(tsb_base.value);

#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 lock the address space.

     * That's correct - we can afford it here

     * because we only read members that are

     * currently read-only.

     */

#ifdef CONFIG_TSB

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

    ASSERT(as->arch.itsb && as->arch.dtsb);

    uintptr_t tsb = (uintptr_t) as->arch.itsb;

    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().

         */

        dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, tsb);

    }

#endif

}

/** @}

 */