mirror of https://gitee.com/openkylin/linux.git
114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
|
/*
|
||
|
|
* 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));
|
||
|
|
}
|