source: mainline/kernel/arch/sparc64/src/mm/page.c@ 28ecadb

/*
 * 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.
 */

/** @addtogroup sparc64mm       
 * @{
 */
/** @file
 */

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

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

/** Map memory-mapped device into virtual memory.
 *
 * So far, only DTLB is used to map devices into memory.
 * Chances are that there will be only a limited amount of
 * devices that the kernel itself needs to lock in DTLB.
 *
 * @param physaddr Physical address of the page where the
 *                 device is located. Must be at least
 *                 page-aligned.
 * @param size Size of the device's registers. Must not
 *             exceed 4M and must include extra space
 *             caused by the alignment.
 *
 * @return Virtual address of the page where the device is
 *         mapped.
 */
uintptr_t hw_map(uintptr_t 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(ALIGN_UP(physaddr, PAGE_SIZE) == physaddr);
        ASSERT(size <= 4*1024*1024);
        
        if (size <= FRAME_SIZE)
                order = 0;
        else
                order = (fnzb64(size - 1) + 1) - FRAME_WIDTH;

        /*
         * Use virtual addresses that are beyond the limit of physical memory.
         * Thus, the physical address space will not be wasted by holes created
         * by frame_alloc().
         */
        ASSERT(last_frame);
        uintptr_t virtaddr = ALIGN_UP(last_frame, 1<<(order + FRAME_WIDTH));
        last_frame = ALIGN_UP(virtaddr + size, 1<<(order + FRAME_WIDTH));
        
        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;
}

/** @}
 */