tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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/memblock.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#include <linux/uaccess.h>
22
23/*
24 * ZERO_PAGE is a special page that is used for zero-initialized
25 * data and COW.
26 */
27unsigned long empty_zero_page;
28EXPORT_SYMBOL(empty_zero_page);
29
30/*
31 * paging_init() continues the virtual memory environment setup which
32 * was begun by the code in arch/head.S.
33 * The parameters are pointers to where to stick the starting and ending
34 * addresses of available kernel virtual memory.
35 */
36void __init paging_init(void)
37{
38 struct pglist_data *pgdat = NODE_DATA(0);
39 unsigned long zones_size[MAX_NR_ZONES] = {0, };
40
41 empty_zero_page = (unsigned long) memblock_alloc(PAGE_SIZE,
42 PAGE_SIZE);
43 if (!empty_zero_page)
44 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
45 __func__, PAGE_SIZE, PAGE_SIZE);
46
47 /*
48 * Set up user data space
49 */
50 set_fs(KERNEL_DS);
51
52 /*
53 * Define zones
54 */
55 zones_size[ZONE_NORMAL] = (memory_end - PAGE_OFFSET) >> PAGE_SHIFT;
56 pgdat->node_zones[ZONE_NORMAL].zone_start_pfn =
57 __pa(PAGE_OFFSET) >> PAGE_SHIFT;
58
59 free_area_init(zones_size);
60}
61
62void __init mem_init(void)
63{
64 high_memory = (void *)(memory_end & PAGE_MASK);
65
66 /* this will put all memory onto the freelists */
67 memblock_free_all();
68
69 mem_init_print_info(NULL);
70}
71
72#ifdef CONFIG_BLK_DEV_INITRD
73void __init free_initrd_mem(unsigned long start, unsigned long end)
74{
75 free_reserved_area((void *)start, (void *)end, -1, "initrd");
76}
77#endif
78
79void __init free_initmem(void)
80{
81 free_initmem_default(-1);
82}