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 */
26 unsigned long empty_zero_page;
27 EXPORT_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 */
paging_init(void)35 void __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
mem_init(void)58 void __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
free_initrd_mem(unsigned long start,unsigned long end)78 void __init free_initrd_mem(unsigned long start, unsigned long end)
79 {
80 int pages = 0;
81 for (; start < end; start += PAGE_SIZE) {
82 ClearPageReserved(virt_to_page(start));
83 init_page_count(virt_to_page(start));
84 free_page(start);
85 totalram_pages++;
86 pages++;
87 }
88 printk(KERN_INFO "Freeing initrd memory: %luk freed\n",
89 (pages * PAGE_SIZE) >> 10);
90 }
91 #endif
92
free_initmem(void)93 void __init free_initmem(void)
94 {
95 unsigned long addr;
96
97 /*
98 * The following code should be cool even if these sections
99 * are not page aligned.
100 */
101 addr = PAGE_ALIGN((unsigned long)(__init_begin));
102
103 /* next to check that the page we free is not a partial page */
104 for (; addr + PAGE_SIZE < (unsigned long)(__init_end);
105 addr += PAGE_SIZE) {
106 ClearPageReserved(virt_to_page(addr));
107 init_page_count(virt_to_page(addr));
108 free_page(addr);
109 totalram_pages++;
110 }
111 printk(KERN_INFO "Freeing unused kernel memory: %dK freed\n",
112 (int) ((addr - PAGE_ALIGN((long) &__init_begin)) >> 10));
113 }
114