source: mainline/kernel/arch/ppc32/src/mm/frame.c

/*
 * Copyright (c) 2005 Martin Decky
 * 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 kernel_ppc32_mm
 * @{
 */
/** @file
 */

#include <arch/asm.h>
#include <arch/boot/boot.h>
#include <arch/mm/frame.h>
#include <mm/frame.h>
#include <align.h>
#include <macros.h>
#include <stdio.h>

memmap_t memmap;

void physmem_print(void)
{
        printf("[base    ] [size    ]\n");

        size_t i;
        for (i = 0; i < memmap.cnt; i++) {
                printf("%p %#0zx\n", memmap.zones[i].start,
                    memmap.zones[i].size);
        }
}

static void frame_common_arch_init(bool low)
{
        pfn_t minconf = 2;
        size_t i;

        for (i = 0; i < memmap.cnt; i++) {
                /* To be safe, make the available zone possibly smaller */
                uintptr_t base = ALIGN_UP((uintptr_t) memmap.zones[i].start,
                    FRAME_SIZE);
                size_t size = ALIGN_DOWN(memmap.zones[i].size -
                    (base - ((uintptr_t) memmap.zones[i].start)), FRAME_SIZE);

                if (!frame_adjust_zone_bounds(low, &base, &size))
                        return;

                pfn_t pfn = ADDR2PFN(base);
                size_t count = SIZE2FRAMES(size);
                pfn_t conf;

                if (low) {
                        if ((minconf < pfn) || (minconf >= pfn + count))
                                conf = pfn;
                        else
                                conf = minconf;
                        zone_create(pfn, count, conf,
                            ZONE_AVAILABLE | ZONE_LOWMEM);
                } else {
                        conf = zone_external_conf_alloc(count);
                        if (conf != 0)
                                zone_create(pfn, count, conf,
                                    ZONE_AVAILABLE | ZONE_HIGHMEM);
                }
        }

}

void frame_low_arch_init(void)
{
        frame_common_arch_init(true);

        /*
         * First is exception vector, second is 'implementation specific',
         * third and fourth is reserved, other contain real mode code
         */
        frame_mark_unavailable(0, 8);

        /* Mark the Page Hash Table frames as unavailable */
        uint32_t sdr1 = sdr1_get();

        // FIXME: compute size of PHT exactly
        frame_mark_unavailable(ADDR2PFN(sdr1 & 0xffff000), 16);
}

void frame_high_arch_init(void)
{
        frame_common_arch_init(false);
}

/** @}
 */