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 #include <asm/uaccess.h>
22
23 /*
24 * ZERO_PAGE is a special page that is used for zero-initialized
25 * data and COW.
26 */
27 unsigned long empty_zero_page;
28 EXPORT_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 */
paging_init(void)36 void __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) alloc_bootmem_pages(PAGE_SIZE);
42 memset((void *)empty_zero_page, 0, PAGE_SIZE);
43
44 /*
45 * Set up user data space
46 */
47 set_fs(KERNEL_DS);
48
49 /*
50 * Define zones
51 */
52 zones_size[ZONE_NORMAL] = (memory_end - PAGE_OFFSET) >> PAGE_SHIFT;
53 pgdat->node_zones[ZONE_NORMAL].zone_start_pfn =
54 __pa(PAGE_OFFSET) >> PAGE_SHIFT;
55
56 free_area_init(zones_size);
57 }
58
mem_init(void)59 void __init mem_init(void)
60 {
61 high_memory = (void *)(memory_end & PAGE_MASK);
62
63 /* this will put all memory onto the freelists */
64 free_all_bootmem();
65
66 mem_init_print_info(NULL);
67 }
68
69 #ifdef CONFIG_BLK_DEV_INITRD
free_initrd_mem(unsigned long start,unsigned long end)70 void __init free_initrd_mem(unsigned long start, unsigned long end)
71 {
72 free_reserved_area((void *)start, (void *)end, -1, "initrd");
73 }
74 #endif
75
free_initmem(void)76 void __init free_initmem(void)
77 {
78 free_initmem_default(-1);
79 }
80