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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/as_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 */

#ifdef CONFIG_VIRT_IDX_DCACHE
#include <arch/mm/cache.h>
#endif /* CONFIG_VIRT_IDX_DCACHE */

/** 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(((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
    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*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) >> PAGE_WIDTH;
    itsb_base_write(tsb_base.value);
    tsb_base.base = ((uintptr_t) as->arch.dtsb) >> PAGE_WIDTH;
    dtsb_base_write(tsb_base.value);
#endif
#ifdef CONFIG_VIRT_IDX_DCACHE
    if (as->dcache_flush_on_install) {
        /*
         * Some mappings in this address space are illegal address
         * aliases. Upon their creation, the dcache_flush_on_install
         * flag was set.
         *
         * We are now obliged to flush the D-cache in order to guarantee
         * that there will be at most one cache line for each address
         * alias.
         *
         * This flush performs a cleanup after another address space in
         * which the alias might have existed.
         */
        dcache_flush();
    }
#endif /* CONFIG_VIRT_IDX_DCACHE */
}

/** 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*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
#ifdef CONFIG_VIRT_IDX_DCACHE
    if (as->dcache_flush_on_deinstall) {
        /*
         * Some mappings in this address space are illegal address
         * aliases. Upon their creation, the dcache_flush_on_deinstall
         * flag was set.
         *
         * We are now obliged to flush the D-cache in order to guarantee
         * that there will be at most one cache line for each address
         * alias.
         *
         * This flush performs a cleanup after this address space. It is
         * necessary because other address spaces that contain the same
         * alias are not necessarily aware of the need to carry out the
         * cache flush. The only address spaces that are aware of it are
         * those that created the illegal alias. 
         */
        dcache_flush();
    }
#endif /* CONFIG_VIRT_IDX_DCACHE */
}

/** @}
 */