memory_init.c

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00001 /*
00002  * Copyright (C) 2005 Martin Decky
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  *
00009  * - Redistributions of source code must retain the above copyright
00010  *   notice, this list of conditions and the following disclaimer.
00011  * - Redistributions in binary form must reproduce the above copyright
00012  *   notice, this list of conditions and the following disclaimer in the
00013  *   documentation and/or other materials provided with the distribution.
00014  * - The name of the author may not be used to endorse or promote products
00015  *   derived from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00018  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00019  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00020  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
00021  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
00022  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00023  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00024  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00025  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
00026  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027  */
00028 
00035 #include <genarch/ofw/memory_init.h>
00036 #include <genarch/ofw/ofw.h>
00037 #include <panic.h>
00038 #include <mm/frame.h>
00039 #include <align.h>
00040 #include <arch/types.h>
00041 #include <typedefs.h>
00042 
00043 #define MEMMAP_MAX_RECORDS 32
00044 
00045 typedef struct {
00046         __address start;
00047         size_t size;
00048 } memmap_t;
00049 
00050 static memmap_t memmap[MEMMAP_MAX_RECORDS];
00051 size_t total_mem = 0;
00052 
00053 void ofw_init_memmap(void)
00054 {
00055         int i;
00056         int ret;
00057 
00058         phandle handle = ofw_find_device("/memory");
00059         if (handle == -1)
00060                 panic("No RAM\n");
00061         
00062         ret = ofw_get_property(handle, "reg", &memmap, sizeof(memmap));
00063         if (ret == -1)
00064                 panic("Device /memory has no reg property\n");
00065         
00066         
00067         for (i = 0; i < MEMMAP_MAX_RECORDS; i++) {
00068                 if (memmap[i].size == 0)
00069                         break;
00070                 total_mem += memmap[i].size;
00071         }
00072 }
00073 
00074 size_t ofw_get_memory_size(void) 
00075 {
00076         return total_mem;
00077 }
00078 
00079 void ofw_init_zones(void)
00080 {
00081         int i;
00082         pfn_t confdata;
00083 
00084         for (i = 0; i < MEMMAP_MAX_RECORDS; i++) {
00085                 if (memmap[i].size == 0)
00086                         break;
00087                 confdata = ADDR2PFN(memmap[i].start);
00088                 if (confdata == 0)
00089                         confdata = 2;
00090                 zone_create(ADDR2PFN(memmap[i].start),
00091                             SIZE2FRAMES(ALIGN_DOWN(memmap[i].size,PAGE_SIZE)),
00092                             confdata, 0);
00093         }
00094 }
00095 

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