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756 jermar 1 
/*
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 * Copyright (c) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup genarchmm
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 * @{
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 */
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/**
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 * @file
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 * @brief   Address space functions for 4-level hierarchical pagetables.
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 */
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#include <genarch/mm/page_pt.h>
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#include <mm/page.h>
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#include <mm/frame.h>
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#include <mm/as.h>
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#include <synch/mutex.h>
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#include <arch/mm/page.h>
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#include <arch/mm/as.h>
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#include <arch/types.h>
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#include <memstr.h>
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#include <arch.h>
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static pte_t *ptl0_create(int flags);
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static void ptl0_destroy(pte_t *page_table);
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static void pt_lock(as_t *as, bool lock);
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static void pt_unlock(as_t *as, bool unlock);
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as_operations_t as_pt_operations = {
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    .page_table_create = ptl0_create,
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    .page_table_destroy = ptl0_destroy,
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    .page_table_lock = pt_lock,
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    .page_table_unlock = pt_unlock
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};
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/** Create PTL0.
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 *
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 * PTL0 of 4-level page table will be created for each address space.
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 *
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 * @param flags Flags can specify whether ptl0 is for the kernel address space.
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 *
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 * @return New PTL0.
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 */
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pte_t *ptl0_create(int flags)
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{
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    pte_t *src_ptl0, *dst_ptl0;
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    ipl_t ipl;
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    dst_ptl0 = (pte_t *) frame_alloc(ONE_FRAME, FRAME_KA);
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    if (flags & FLAG_AS_KERNEL) {
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        memsetb((uintptr_t) dst_ptl0, PAGE_SIZE, 0);
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    } else {
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        uintptr_t src, dst;
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        /*
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         * Copy the kernel address space portion to new PTL0.
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         */
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        ipl = interrupts_disable();
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        mutex_lock(&AS_KERNEL->lock);      
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        src_ptl0 = (pte_t *) PA2KA((uintptr_t) AS_KERNEL->genarch.page_table);
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        src = (uintptr_t) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
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        dst = (uintptr_t) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)];
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        memsetb((uintptr_t) dst_ptl0, PAGE_SIZE, 0);
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        memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (uintptr_t) src_ptl0));
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        mutex_unlock(&AS_KERNEL->lock);
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        interrupts_restore(ipl);
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    }
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    return (pte_t *) KA2PA((uintptr_t) dst_ptl0);
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}
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/** Destroy page table.
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 *
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 * Destroy PTL0, other levels are expected to be already deallocated.
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 *
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 * @param page_table Physical address of PTL0.
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 */
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void ptl0_destroy(pte_t *page_table)
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{
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    frame_free((uintptr_t)page_table);
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}
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/** Lock page tables.
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 *
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 * Lock only the address space.
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 * Interrupts must be disabled.
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 *
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 * @param as Address space.
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 * @param lock If false, do not attempt to lock the address space.
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 */
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void pt_lock(as_t *as, bool lock)
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{
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    if (lock)
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        mutex_lock(&as->lock);
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}
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/** Unlock page tables.
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 *
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 * Unlock the address space.
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 * Interrupts must be disabled.
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 *
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 * @param as Address space.
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 * @param unlock If false, do not attempt to unlock the address space.
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 */
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void pt_unlock(as_t *as, bool unlock)
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{
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    if (unlock)
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        mutex_unlock(&as->lock);
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}
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/** @}
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 */