Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Port on Texas Instruments TMS320C6x architecture
3 *
4 * Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
5 * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/mm.h>
12#include <linux/swap.h>
13#include <linux/module.h>
14#include <linux/bootmem.h>
15#ifdef CONFIG_BLK_DEV_RAM
16#include <linux/blkdev.h>
17#endif
18#include <linux/initrd.h>
19
20#include <asm/sections.h>
21
22/*
23 * ZERO_PAGE is a special page that is used for zero-initialized
24 * data and COW.
25 */
26unsigned long empty_zero_page;
27EXPORT_SYMBOL(empty_zero_page);
28
29/*
30 * paging_init() continues the virtual memory environment setup which
31 * was begun by the code in arch/head.S.
32 * The parameters are pointers to where to stick the starting and ending
33 * addresses of available kernel virtual memory.
34 */
35void __init paging_init(void)
36{
37 struct pglist_data *pgdat = NODE_DATA(0);
38 unsigned long zones_size[MAX_NR_ZONES] = {0, };
39
40 empty_zero_page = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
41 memset((void *)empty_zero_page, 0, PAGE_SIZE);
42
43 /*
44 * Set up user data space
45 */
46 set_fs(KERNEL_DS);
47
48 /*
49 * Define zones
50 */
51 zones_size[ZONE_NORMAL] = (memory_end - PAGE_OFFSET) >> PAGE_SHIFT;
52 pgdat->node_zones[ZONE_NORMAL].zone_start_pfn =
53 __pa(PAGE_OFFSET) >> PAGE_SHIFT;
54
55 free_area_init(zones_size);
56}
57
58void __init mem_init(void)
59{
60 int codek, datak;
61 unsigned long tmp;
62 unsigned long len = memory_end - memory_start;
63
64 high_memory = (void *)(memory_end & PAGE_MASK);
65
66 /* this will put all memory onto the freelists */
67 totalram_pages = free_all_bootmem();
68
69 codek = (_etext - _stext) >> 10;
70 datak = (_end - _sdata) >> 10;
71
72 tmp = nr_free_pages() << PAGE_SHIFT;
73 printk(KERN_INFO "Memory: %luk/%luk RAM (%dk kernel code, %dk data)\n",
74 tmp >> 10, len >> 10, codek, datak);
75}
76
77#ifdef CONFIG_BLK_DEV_INITRD
78void __init free_initrd_mem(unsigned long start, unsigned long end)
79{
80 free_reserved_area(start, end, 0, "initrd");
81}
82#endif
83
84void __init free_initmem(void)
85{
86 free_initmem_default(0);
87}