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/*
* Copyright (C) 2005 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.
*
*/
#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 simmem_memtypes {
simmem_reserved = 0,
simmem_free,
};
struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
#ifdef DEBUG
static char *mtypes[3] = {
"SIM reserved memory",
"SIM free memory",
};
#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)
{
unsigned int memsize;
memsize = 0x02000000;
prom_printf("Setting default memory size 0x%08x\n", memsize);
memset(mdesc, 0, sizeof(mdesc));
mdesc[0].type = simmem_reserved;
mdesc[0].base = 0x00000000;
mdesc[0].size = 0x00001000;
mdesc[1].type = simmem_free;
mdesc[1].base = 0x00001000;
mdesc[1].size = 0x000ff000;
mdesc[2].type = simmem_reserved;
mdesc[2].base = 0x00100000;
mdesc[2].size = CPHYSADDR(PFN_ALIGN(&_end)) - mdesc[2].base;
mdesc[3].type = simmem_free;
mdesc[3].base = CPHYSADDR(PFN_ALIGN(&_end));
mdesc[3].size = memsize - mdesc[3].base;
return &mdesc[0];
}
static int __init prom_memtype_classify (unsigned int type)
{
switch (type) {
case simmem_free:
return BOOT_MEM_RAM;
case simmem_reserved:
default:
return BOOT_MEM_RESERVED;
}
}
void __init prom_meminit(void)
{
struct prom_pmemblock *p;
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++;
}
}
unsigned long __init prom_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((unsigned long)__va(addr));
addr += PAGE_SIZE;
freed += PAGE_SIZE;
}
}
printk("Freeing prom memory: %ldkb freed\n", freed >> 10);
return freed;
}
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