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/*
* Port on Texas Instruments TMS320C6x architecture
*
* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/module.h>
#include <linux/bootmem.h>
#ifdef CONFIG_BLK_DEV_RAM
#include <linux/blkdev.h>
#endif
#include <linux/initrd.h>
#include <asm/sections.h>
/*
* ZERO_PAGE is a special page that is used for zero-initialized
* data and COW.
*/
unsigned long empty_zero_page;
EXPORT_SYMBOL(empty_zero_page);
/*
* paging_init() continues the virtual memory environment setup which
* was begun by the code in arch/head.S.
* The parameters are pointers to where to stick the starting and ending
* addresses of available kernel virtual memory.
*/
void __init paging_init(void)
{
struct pglist_data *pgdat = NODE_DATA(0);
unsigned long zones_size[MAX_NR_ZONES] = {0, };
empty_zero_page = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
memset((void *)empty_zero_page, 0, PAGE_SIZE);
/*
* Set up user data space
*/
set_fs(KERNEL_DS);
/*
* Define zones
*/
zones_size[ZONE_NORMAL] = (memory_end - PAGE_OFFSET) >> PAGE_SHIFT;
pgdat->node_zones[ZONE_NORMAL].zone_start_pfn =
__pa(PAGE_OFFSET) >> PAGE_SHIFT;
free_area_init(zones_size);
}
void __init mem_init(void)
{
int codek, datak;
unsigned long tmp;
unsigned long len = memory_end - memory_start;
high_memory = (void *)(memory_end & PAGE_MASK);
/* this will put all memory onto the freelists */
totalram_pages = free_all_bootmem();
codek = (_etext - _stext) >> 10;
datak = (_end - _sdata) >> 10;
tmp = nr_free_pages() << PAGE_SHIFT;
printk(KERN_INFO "Memory: %luk/%luk RAM (%dk kernel code, %dk data)\n",
tmp >> 10, len >> 10, codek, datak);
}
#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
int pages = 0;
for (; start < end; start += PAGE_SIZE) {
ClearPageReserved(virt_to_page(start));
init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
pages++;
}
printk(KERN_INFO "Freeing initrd memory: %luk freed\n",
(pages * PAGE_SIZE) >> 10);
}
#endif
void __init free_initmem(void)
{
unsigned long addr;
/*
* The following code should be cool even if these sections
* are not page aligned.
*/
addr = PAGE_ALIGN((unsigned long)(__init_begin));
/* next to check that the page we free is not a partial page */
for (; addr + PAGE_SIZE < (unsigned long)(__init_end);
addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
printk(KERN_INFO "Freeing unused kernel memory: %dK freed\n",
(int) ((addr - PAGE_ALIGN((long) &__init_begin)) >> 10));
}
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