| Aurelien Jacquiot | 14aa7e8 | 2011-10-04 12:17:19 -0400 | [diff] [blame] | 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 | */ |
| 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 | |
| 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 |
| 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 | |
| 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 | } |