130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
/*
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* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <asm/bootinfo.h>
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#include <asm/page.h>
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#include <asm/mips-boards/prom.h>
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/*#define DEBUG*/
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enum simmem_memtypes {
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simmem_reserved = 0,
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simmem_free,
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};
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struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
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#ifdef DEBUG
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static char *mtypes[3] = {
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"SIM reserved memory",
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"SIM free memory",
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};
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#endif
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/* References to section boundaries */
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extern char _end;
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#define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
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struct prom_pmemblock * __init prom_getmdesc(void)
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{
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unsigned int memsize;
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memsize = 0x02000000;
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prom_printf("Setting default memory size 0x%08x\n", memsize);
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memset(mdesc, 0, sizeof(mdesc));
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mdesc[0].type = simmem_reserved;
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mdesc[0].base = 0x00000000;
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mdesc[0].size = 0x00001000;
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mdesc[1].type = simmem_free;
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mdesc[1].base = 0x00001000;
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mdesc[1].size = 0x000ff000;
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mdesc[2].type = simmem_reserved;
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mdesc[2].base = 0x00100000;
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mdesc[2].size = CPHYSADDR(PFN_ALIGN(&_end)) - mdesc[2].base;
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mdesc[3].type = simmem_free;
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mdesc[3].base = CPHYSADDR(PFN_ALIGN(&_end));
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mdesc[3].size = memsize - mdesc[3].base;
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return &mdesc[0];
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}
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static int __init prom_memtype_classify (unsigned int type)
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{
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switch (type) {
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case simmem_free:
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return BOOT_MEM_RAM;
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case simmem_reserved:
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default:
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return BOOT_MEM_RESERVED;
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}
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}
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void __init prom_meminit(void)
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{
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struct prom_pmemblock *p;
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p = prom_getmdesc();
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while (p->size) {
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long type;
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unsigned long base, size;
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type = prom_memtype_classify (p->type);
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base = p->base;
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size = p->size;
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add_memory_region(base, size, type);
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p++;
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}
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}
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unsigned long __init prom_free_prom_memory(void)
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{
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int i;
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unsigned long freed = 0;
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unsigned long addr;
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
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continue;
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addr = boot_mem_map.map[i].addr;
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while (addr < boot_mem_map.map[i].addr
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+ boot_mem_map.map[i].size) {
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ClearPageReserved(virt_to_page(__va(addr)));
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set_page_count(virt_to_page(__va(addr)), 1);
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free_page((unsigned long)__va(addr));
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addr += PAGE_SIZE;
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freed += PAGE_SIZE;
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}
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}
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printk("Freeing prom memory: %ldkb freed\n", freed >> 10);
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return freed;
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}
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