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1424 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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/**
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 * @file    backend_elf.c
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 * @brief   Backend for address space areas backed by continuous physical memory.
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 */
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#include <debug.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <mm/as.h>
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#include <mm/frame.h>
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#include <mm/slab.h>
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#include <memstr.h>
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#include <macros.h>
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#include <arch.h>
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#include <align.h>
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static int phys_page_fault(as_area_t *area, __address addr, pf_access_t access);
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static void phys_share(as_area_t *area);
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mem_backend_t phys_backend = {
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    .page_fault = phys_page_fault,
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    .frame_free = NULL,
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    .share = phys_share
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};
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/** Service a page fault in the address space area backed by physical memory.
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 *
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 * The address space area and page tables must be already locked.
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 *
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 * @param area Pointer to the address space area.
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 * @param addr Faulting virtual address.
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 * @param access Access mode that caused the fault (i.e. read/write/exec).
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 *
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 * @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced).
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 */
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int phys_page_fault(as_area_t *area, __address addr, pf_access_t access)
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{
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    __address base = area->backend_data.base;
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    if (!as_area_check_access(area, access))
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        return AS_PF_FAULT;
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    ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE);
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    page_mapping_insert(AS, addr, base + (addr - area->base), as_area_get_flags(area));
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        if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1))
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                panic("Could not insert used space.\n");
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    return AS_PF_OK;
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}
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/** Share address space area backed by physical memory.
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 *
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 * Do actually nothing as sharing of address space areas
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 * that are backed up by physical memory is very easy.
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 * Note that the function must be defined so that
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 * as_area_share() will succeed.
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 */
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void phys_share(as_area_t *area)
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{
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}