Yoshinori Sato | bbeb79a | 2015-01-28 02:47:36 +0900 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/h8300/mm/init.c |
| 3 | * |
| 4 | * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, |
| 5 | * Kenneth Albanowski <kjahds@kjahds.com>, |
| 6 | * Copyright (C) 2000 Lineo, Inc. (www.lineo.com) |
| 7 | * |
| 8 | * Based on: |
| 9 | * |
| 10 | * linux/arch/m68knommu/mm/init.c |
| 11 | * linux/arch/m68k/mm/init.c |
| 12 | * |
| 13 | * Copyright (C) 1995 Hamish Macdonald |
| 14 | * |
| 15 | * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com) |
| 16 | * DEC/2000 -- linux 2.4 support <davidm@snapgear.com> |
| 17 | */ |
| 18 | |
| 19 | #include <linux/signal.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/string.h> |
| 24 | #include <linux/types.h> |
| 25 | #include <linux/ptrace.h> |
| 26 | #include <linux/mman.h> |
| 27 | #include <linux/mm.h> |
| 28 | #include <linux/swap.h> |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/highmem.h> |
| 31 | #include <linux/pagemap.h> |
| 32 | #include <linux/bootmem.h> |
| 33 | #include <linux/gfp.h> |
| 34 | |
| 35 | #include <asm/setup.h> |
| 36 | #include <asm/segment.h> |
| 37 | #include <asm/page.h> |
| 38 | #include <asm/pgtable.h> |
| 39 | #include <asm/sections.h> |
| 40 | |
| 41 | /* |
| 42 | * BAD_PAGE is the page that is used for page faults when linux |
| 43 | * is out-of-memory. Older versions of linux just did a |
| 44 | * do_exit(), but using this instead means there is less risk |
| 45 | * for a process dying in kernel mode, possibly leaving a inode |
| 46 | * unused etc.. |
| 47 | * |
| 48 | * BAD_PAGETABLE is the accompanying page-table: it is initialized |
| 49 | * to point to BAD_PAGE entries. |
| 50 | * |
| 51 | * ZERO_PAGE is a special page that is used for zero-initialized |
| 52 | * data and COW. |
| 53 | */ |
| 54 | static unsigned long empty_bad_page_table; |
| 55 | static unsigned long empty_bad_page; |
| 56 | unsigned long empty_zero_page; |
| 57 | |
| 58 | /* |
| 59 | * paging_init() continues the virtual memory environment setup which |
| 60 | * was begun by the code in arch/head.S. |
| 61 | * The parameters are pointers to where to stick the starting and ending |
| 62 | * addresses of available kernel virtual memory. |
| 63 | */ |
| 64 | void __init paging_init(void) |
| 65 | { |
| 66 | /* |
| 67 | * Make sure start_mem is page aligned, otherwise bootmem and |
| 68 | * page_alloc get different views og the world. |
| 69 | */ |
| 70 | unsigned long start_mem = PAGE_ALIGN(memory_start); |
| 71 | unsigned long end_mem = memory_end & PAGE_MASK; |
| 72 | |
| 73 | pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n", |
| 74 | start_mem, end_mem); |
| 75 | |
| 76 | /* |
| 77 | * Initialize the bad page table and bad page to point |
| 78 | * to a couple of allocated pages. |
| 79 | */ |
| 80 | empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); |
| 81 | empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); |
| 82 | empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); |
| 83 | memset((void *)empty_zero_page, 0, PAGE_SIZE); |
| 84 | |
| 85 | /* |
| 86 | * Set up SFC/DFC registers (user data space). |
| 87 | */ |
| 88 | set_fs(USER_DS); |
| 89 | |
| 90 | pr_debug("before free_area_init\n"); |
| 91 | |
| 92 | pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n", |
| 93 | start_mem, end_mem); |
| 94 | |
| 95 | { |
| 96 | unsigned long zones_size[MAX_NR_ZONES] = {0, }; |
| 97 | |
| 98 | zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; |
| 99 | free_area_init(zones_size); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | void __init mem_init(void) |
| 104 | { |
| 105 | pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end); |
| 106 | |
| 107 | high_memory = (void *) (memory_end & PAGE_MASK); |
| 108 | max_mapnr = MAP_NR(high_memory); |
| 109 | |
| 110 | /* this will put all low memory onto the freelists */ |
| 111 | free_all_bootmem(); |
| 112 | |
| 113 | mem_init_print_info(NULL); |
| 114 | } |
| 115 | |
| 116 | |
| 117 | #ifdef CONFIG_BLK_DEV_INITRD |
| 118 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 119 | { |
| 120 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
| 121 | } |
| 122 | #endif |
| 123 | |
| 124 | void |
| 125 | free_initmem(void) |
| 126 | { |
| 127 | free_initmem_default(-1); |
| 128 | } |