source: mainline/kernel/arch/sparc64/src/mm/sun4u/frame.c@ 0b4a67a

/*
 * 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/frame.h>
#include <mm/frame.h>
#include <arch/boot/boot.h>
#include <typedefs.h>
#include <config.h>
#include <align.h>
#include <macros.h>

uintptr_t last_frame = (uintptr_t) NULL;

/** Create memory zones according to information stored in memmap.
 *
 * Walk the memory map and create frame zones according to it.
 */
void frame_arch_init(void)
{
        if (config.cpu_active == 1) {
                unsigned int i;
                
                for (i = 0; i < memmap.cnt; i++) {
                        /* To be safe, make the available zone possibly smaller */
                        uintptr_t new_start = ALIGN_UP((uintptr_t) memmap.zones[i].start,
                            FRAME_SIZE);
                        size_t new_size = ALIGN_DOWN(memmap.zones[i].size -
                            (new_start - ((uintptr_t) memmap.zones[i].start)), FRAME_SIZE);
                        
                        /*
                         * The memmap is created by HelenOS boot loader.
                         * It already contains no holes.
                         */
                        
                        pfn_t confdata = ADDR2PFN(new_start);
                        
                        if (confdata == ADDR2PFN(KA2PA(PFN2ADDR(0))))
                                confdata = ADDR2PFN(KA2PA(PFN2ADDR(2)));
                        
                        zone_create(ADDR2PFN(new_start), SIZE2FRAMES(new_size),
                            confdata, 0);
                        
                        last_frame = max(last_frame, new_start + new_size);
                }
                
                /*
                 * On sparc64, physical memory can start on a non-zero address.
                 * The generic frame_init() only marks PFN 0 as not free, so we
                 * must mark the physically first frame not free explicitly
                 * here, no matter what is its address.
                 */
                frame_mark_unavailable(ADDR2PFN(KA2PA(PFN2ADDR(0))), 1);
        }
        
        end_of_identity = PA2KA(last_frame);
}

/** @}
 */