/* * Carsten Langgaard, carstenl@mips.com * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved. * * ######################################################################## * *  This program is free software; you can distribute it and/or modify it *  under the terms of the GNU General Public License (Version 2) as *  published by the Free Software Foundation. * *  This program is distributed in the hope it will be useful, but WITHOUT *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License *  for more details. * *  You should have received a copy of the GNU General Public License along *  with this program; if not, write to the Free Software Foundation, Inc., *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA. * * ######################################################################## * * PROM library functions for acquiring/using memory descriptors given to  * us from the YAMON. *  */#include <linux/config.h>#include <linux/init.h>#include <linux/mm.h>#include <linux/bootmem.h>#include <asm/bootinfo.h>#include <asm/page.h>#include <asm/mips-boards/prom.h>/*#define DEBUG*/enum yamon_memtypes {	yamon_dontuse,	yamon_prom,	yamon_free,};struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];#ifdef DEBUGstatic char *mtypes[3] = {	"Dont use memory",	"YAMON PROM memory",	"Free memmory",};#endif/* References to section boundaries */extern char _end;#define PFN_ALIGN(x)    (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)struct prom_pmemblock * __init prom_getmdesc(void){	char *memsize_str;	unsigned int memsize;	memsize_str = prom_getenv("memsize");	if (!memsize_str) {		prom_printf("memsize not set in boot prom, set to default (32Mb)\n");		memsize = 0x02000000;	} else {#ifdef DEBUG		prom_printf("prom_memsize = %s\n", memsize_str);#endif		memsize = simple_strtol(memsize_str, NULL, 0);	}	memset(mdesc, 0, sizeof(mdesc));	mdesc[0].type = yamon_dontuse;	mdesc[0].base = 0x00000000;	mdesc[0].size = 0x00001000;	mdesc[1].type = yamon_prom;	mdesc[1].base = 0x00001000;	mdesc[1].size = 0x000ef000;#if (CONFIG_MIPS_MALTA)	/* 	 * The area 0x000f0000-0x000fffff is allocated for BIOS memory by the	 * south bridge and PCI access always forwarded to the ISA Bus and 	 * BIOSCS# is always generated.	 * This mean that this area can't be used as DMA memory for PCI 	 * devices.	 */	mdesc[2].type = yamon_dontuse;	mdesc[2].base = 0x000f0000;	mdesc[2].size = 0x00010000;#else	mdesc[2].type = yamon_prom;	mdesc[2].base = 0x000f0000;	mdesc[2].size = 0x00010000;#endif	mdesc[3].type = yamon_dontuse;	mdesc[3].base = 0x00100000;	mdesc[3].size = PHYSADDR(PFN_ALIGN(&_end)) - mdesc[3].base;	mdesc[4].type = yamon_free;	mdesc[4].base = PHYSADDR(PFN_ALIGN(&_end));	mdesc[4].size = memsize - mdesc[4].base;	return &mdesc[0];}static int __init prom_memtype_classify (unsigned int type){	switch (type) {	case yamon_free:		return BOOT_MEM_RAM;	case yamon_prom:		return BOOT_MEM_ROM_DATA;	default:		return BOOT_MEM_RESERVED;	}}void __init prom_meminit(void){	struct prom_pmemblock *p;#ifdef DEBUG	prom_printf("YAMON MEMORY DESCRIPTOR dump:\n");	p = prom_getmdesc();	while (p->size) {		int i = 0;		prom_printf("[%d,%p]: base<%08lx> size<%08lx> type<%s>\n",			    i, p, p->base, p->size, mtypes[p->type]);		p++;		i++;	}#endif	p = prom_getmdesc();	while (p->size) {		long type;		unsigned long base, size;		type = prom_memtype_classify (p->type);		base = p->base;		size = p->size;		add_memory_region(base, size, type);                p++; 	}}void __initprom_free_prom_memory (void){	int i;	unsigned long freed = 0;	unsigned long addr;	for (i = 0; i < boot_mem_map.nr_map; i++) {		if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)			continue;		addr = boot_mem_map.map[i].addr;		while (addr < boot_mem_map.map[i].addr			      + boot_mem_map.map[i].size) {			ClearPageReserved(virt_to_page(__va(addr)));			set_page_count(virt_to_page(__va(addr)), 1);			free_page(__va(addr));			addr += PAGE_SIZE;			freed += PAGE_SIZE;		}	}	printk("Freeing prom memory: %ldkb freed\n", freed >> 10);}