source: mainline/kernel/arch/sparc64/src/mm/sun4v/as.c@ a000878c

/*
 * 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);

        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;
        as->arch.tsb_description.context = 0;

        memsetb((void *) PA2KA(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
        size_t cnt = (TSB_ENTRY_COUNT * sizeof(tsb_entry_t)) >> FRAME_WIDTH;
        frame_free((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, (size_t) -1);
#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 = PA2KA(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);
                dtlb_insert_mapping(tsb, KA2PA(tsb), PAGESIZE_64K, true, true);
        }

        __hypercall_fast2(MMU_TSB_CTXNON0, 1, KA2PA(&(as->arch.tsb_description)));
        
#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 = PA2KA(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().
                 */
                __hypercall_fast3(MMU_UNMAP_PERM_ADDR, tsb, 0, MMU_FLAG_DTLB);
        }
#endif
}

/** @}
 */