Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/cris/mm/init.c |
| 3 | * |
| 4 | * Copyright (C) 1995 Linus Torvalds |
| 5 | * Copyright (C) 2000,2001 Axis Communications AB |
| 6 | * |
| 7 | * Authors: Bjorn Wesen (bjornw@axis.com) |
| 8 | * |
| 9 | * $Log: init.c,v $ |
| 10 | * Revision 1.11 2004/05/28 09:28:56 starvik |
| 11 | * Calculation of loops_per_usec moved because initalization order has changed |
| 12 | * in Linux 2.6. |
| 13 | * |
| 14 | * Revision 1.10 2004/05/14 07:58:05 starvik |
| 15 | * Merge of changes from 2.4 |
| 16 | * |
| 17 | * Revision 1.9 2003/07/04 08:27:54 starvik |
| 18 | * Merge of Linux 2.5.74 |
| 19 | * |
| 20 | * Revision 1.8 2003/04/09 05:20:48 starvik |
| 21 | * Merge of Linux 2.5.67 |
| 22 | * |
| 23 | * Revision 1.7 2003/01/22 06:48:38 starvik |
| 24 | * Fixed warnings issued by GCC 3.2.1 |
| 25 | * |
| 26 | * Revision 1.6 2002/12/11 14:44:48 starvik |
| 27 | * Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/mm |
| 28 | * |
| 29 | * Revision 1.5 2002/11/18 07:37:37 starvik |
| 30 | * Added cache bug workaround (from Linux 2.4) |
| 31 | * |
| 32 | * Revision 1.4 2002/11/13 15:40:24 starvik |
| 33 | * Removed the page table cache stuff (as done in other archs) |
| 34 | * |
| 35 | * Revision 1.3 2002/11/05 06:45:13 starvik |
| 36 | * Merge of Linux 2.5.45 |
| 37 | * |
| 38 | * Revision 1.2 2001/12/18 13:35:22 bjornw |
| 39 | * Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15). |
| 40 | * |
| 41 | * Revision 1.31 2001/11/13 16:22:00 bjornw |
| 42 | * Skip calculating totalram and sharedram in si_meminfo |
| 43 | * |
| 44 | * Revision 1.30 2001/11/12 19:02:10 pkj |
| 45 | * Fixed compiler warnings. |
| 46 | * |
| 47 | * Revision 1.29 2001/07/25 16:09:50 bjornw |
| 48 | * val->sharedram will stay 0 |
| 49 | * |
| 50 | * Revision 1.28 2001/06/28 16:30:17 bjornw |
| 51 | * Oops. This needs to wait until 2.4.6 is merged |
| 52 | * |
| 53 | * Revision 1.27 2001/06/28 14:04:07 bjornw |
| 54 | * Fill in sharedram |
| 55 | * |
| 56 | * Revision 1.26 2001/06/18 06:36:02 hp |
| 57 | * Enable free_initmem of __init-type pages |
| 58 | * |
| 59 | * Revision 1.25 2001/06/13 00:02:23 bjornw |
| 60 | * Use a separate variable to store the current pgd to avoid races in schedule |
| 61 | * |
| 62 | * Revision 1.24 2001/05/15 00:52:20 hp |
| 63 | * Only map segment 0xa as seg if CONFIG_JULIETTE |
| 64 | * |
| 65 | * Revision 1.23 2001/04/04 14:35:40 bjornw |
| 66 | * * Removed get_pte_slow and friends (2.4.3 change) |
| 67 | * * Removed bad_pmd handling (2.4.3 change) |
| 68 | * |
| 69 | * Revision 1.22 2001/04/04 13:38:04 matsfg |
| 70 | * Moved ioremap to a separate function instead |
| 71 | * |
| 72 | * Revision 1.21 2001/03/27 09:28:33 bjornw |
| 73 | * ioremap used too early - lets try it in mem_init instead |
| 74 | * |
| 75 | * Revision 1.20 2001/03/23 07:39:21 starvik |
| 76 | * Corrected according to review remarks |
| 77 | * |
| 78 | * Revision 1.19 2001/03/15 14:25:17 bjornw |
| 79 | * More general shadow registers and ioremaped addresses for external I/O |
| 80 | * |
| 81 | * Revision 1.18 2001/02/23 12:46:44 bjornw |
| 82 | * * 0xc was not CSE1; 0x8 is, same as uncached flash, so we move the uncached |
| 83 | * flash during CRIS_LOW_MAP from 0xe to 0x8 so both the flash and the I/O |
| 84 | * is mapped straight over (for !CRIS_LOW_MAP the uncached flash is still 0xe) |
| 85 | * |
| 86 | * Revision 1.17 2001/02/22 15:05:21 bjornw |
| 87 | * Map 0x9 straight over during LOW_MAP to allow for memory mapped LEDs |
| 88 | * |
| 89 | * Revision 1.16 2001/02/22 15:02:35 bjornw |
| 90 | * Map 0xc straight over during LOW_MAP to allow for memory mapped I/O |
| 91 | * |
| 92 | * Revision 1.15 2001/01/10 21:12:10 bjornw |
| 93 | * loops_per_sec -> loops_per_jiffy |
| 94 | * |
| 95 | * Revision 1.14 2000/11/22 16:23:20 bjornw |
| 96 | * Initialize totalhigh counters to 0 to make /proc/meminfo look nice. |
| 97 | * |
| 98 | * Revision 1.13 2000/11/21 16:37:51 bjornw |
| 99 | * Temporarily disable initmem freeing |
| 100 | * |
| 101 | * Revision 1.12 2000/11/21 13:55:07 bjornw |
| 102 | * Use CONFIG_CRIS_LOW_MAP for the low VM map instead of explicit CPU type |
| 103 | * |
| 104 | * Revision 1.11 2000/10/06 12:38:22 bjornw |
| 105 | * Cast empty_bad_page correctly (should really be of * type from the start.. |
| 106 | * |
| 107 | * Revision 1.10 2000/10/04 16:53:57 bjornw |
| 108 | * Fix memory-map due to LX features |
| 109 | * |
| 110 | * Revision 1.9 2000/09/13 15:47:49 bjornw |
| 111 | * Wrong count in reserved-pages loop |
| 112 | * |
| 113 | * Revision 1.8 2000/09/13 14:35:10 bjornw |
| 114 | * 2.4.0-test8 added a new arg to free_area_init_node |
| 115 | * |
| 116 | * Revision 1.7 2000/08/17 15:35:55 bjornw |
| 117 | * 2.4.0-test6 removed MAP_NR and inserted virt_to_page |
| 118 | * |
| 119 | * |
| 120 | */ |
| 121 | |
| 122 | #include <linux/init.h> |
| 123 | #include <linux/bootmem.h> |
| 124 | #include <asm/tlb.h> |
| 125 | |
| 126 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| 127 | |
| 128 | unsigned long empty_zero_page; |
| 129 | |
| 130 | extern char _stext, _edata, _etext; /* From linkerscript */ |
| 131 | extern char __init_begin, __init_end; |
| 132 | |
| 133 | void |
| 134 | show_mem(void) |
| 135 | { |
| 136 | int i,free = 0,total = 0,cached = 0, reserved = 0, nonshared = 0; |
| 137 | int shared = 0; |
| 138 | |
| 139 | printk("\nMem-info:\n"); |
| 140 | show_free_areas(); |
| 141 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
| 142 | i = max_mapnr; |
| 143 | while (i-- > 0) { |
| 144 | total++; |
| 145 | if (PageReserved(mem_map+i)) |
| 146 | reserved++; |
| 147 | else if (PageSwapCache(mem_map+i)) |
| 148 | cached++; |
| 149 | else if (!page_count(mem_map+i)) |
| 150 | free++; |
| 151 | else if (page_count(mem_map+i) == 1) |
| 152 | nonshared++; |
| 153 | else |
| 154 | shared += page_count(mem_map+i) - 1; |
| 155 | } |
| 156 | printk("%d pages of RAM\n",total); |
| 157 | printk("%d free pages\n",free); |
| 158 | printk("%d reserved pages\n",reserved); |
| 159 | printk("%d pages nonshared\n",nonshared); |
| 160 | printk("%d pages shared\n",shared); |
| 161 | printk("%d pages swap cached\n",cached); |
| 162 | } |
| 163 | |
| 164 | void __init |
| 165 | mem_init(void) |
| 166 | { |
| 167 | int codesize, reservedpages, datasize, initsize; |
| 168 | unsigned long tmp; |
| 169 | |
| 170 | if(!mem_map) |
| 171 | BUG(); |
| 172 | |
| 173 | /* max/min_low_pfn was set by setup.c |
| 174 | * now we just copy it to some other necessary places... |
| 175 | * |
| 176 | * high_memory was also set in setup.c |
| 177 | */ |
| 178 | |
| 179 | max_mapnr = num_physpages = max_low_pfn - min_low_pfn; |
| 180 | |
| 181 | /* this will put all memory onto the freelists */ |
| 182 | totalram_pages = free_all_bootmem(); |
| 183 | |
| 184 | reservedpages = 0; |
| 185 | for (tmp = 0; tmp < max_mapnr; tmp++) { |
| 186 | /* |
| 187 | * Only count reserved RAM pages |
| 188 | */ |
| 189 | if (PageReserved(mem_map + tmp)) |
| 190 | reservedpages++; |
| 191 | } |
| 192 | |
| 193 | codesize = (unsigned long) &_etext - (unsigned long) &_stext; |
| 194 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| 195 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 196 | |
| 197 | printk(KERN_INFO |
| 198 | "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, " |
| 199 | "%dk init)\n" , |
| 200 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| 201 | max_mapnr << (PAGE_SHIFT-10), |
| 202 | codesize >> 10, |
| 203 | reservedpages << (PAGE_SHIFT-10), |
| 204 | datasize >> 10, |
| 205 | initsize >> 10 |
| 206 | ); |
| 207 | } |
| 208 | |
| 209 | /* free the pages occupied by initialization code */ |
| 210 | |
| 211 | void |
| 212 | free_initmem(void) |
| 213 | { |
| 214 | unsigned long addr; |
| 215 | |
| 216 | addr = (unsigned long)(&__init_begin); |
| 217 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { |
| 218 | ClearPageReserved(virt_to_page(addr)); |
| 219 | set_page_count(virt_to_page(addr), 1); |
| 220 | free_page(addr); |
| 221 | totalram_pages++; |
| 222 | } |
| 223 | printk (KERN_INFO "Freeing unused kernel memory: %luk freed\n", |
| 224 | (unsigned long)((&__init_end - &__init_begin) >> 10)); |
| 225 | } |