page.c

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/*
 * Copyright (C) 2005 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.
 */

#include <arch/mm/page.h>
#include <arch/mm/tlb.h>
#include <genarch/mm/page_ht.h>
#include <mm/frame.h>
#include <bitops.h>
#include <debug.h>

void page_arch_init(void)
{
        page_mapping_operations = &ht_mapping_operations;
}

__address hw_map(__address physaddr, size_t size)
{
        unsigned int order;
        int i;

        struct {
                int pagesize;
                size_t increment;
                count_t count;
        } sizemap[] = {
                { PAGESIZE_8K, 0, 1 },                  /* 8K */
                { PAGESIZE_8K, PAGE_SIZE, 2 },          /* 16K */
                { PAGESIZE_8K, PAGE_SIZE, 4 },          /* 32K */
                { PAGESIZE_64K, 0, 1},                  /* 64K */
                { PAGESIZE_64K, 8*PAGE_SIZE, 2 },       /* 128K */
                { PAGESIZE_64K, 8*PAGE_SIZE, 4 },       /* 256K */
                { PAGESIZE_512K, 0, 1 },                /* 512K */
                { PAGESIZE_512K, 64*PAGE_SIZE, 2 },     /* 1M */
                { PAGESIZE_512K, 64*PAGE_SIZE, 4 },     /* 2M */
                { PAGESIZE_4M, 0, 1 }                   /* 4M */
        };
        
        ASSERT(size <= 4*1024*1024);
        
        if (size <= FRAME_SIZE)
                order = 0;
        else
                order = (fnzb32(size - 1) + 1) - FRAME_WIDTH;
        
        __address virtaddr = PA2KA(PFN2ADDR(frame_alloc(order, FRAME_KA)));

        for (i = 0; i < sizemap[order].count; i++)
                dtlb_insert_mapping(virtaddr + i*sizemap[order].increment,
                                    physaddr + i*sizemap[order].increment,
                                    sizemap[order].pagesize, true, false);
        
        return virtaddr;
}

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