2 * linux/arch/cris/mm/init.c
4 * Copyright (C) 1995 Linus Torvalds
5 * Copyright (C) 2000,2001 Axis Communications AB
7 * Authors: Bjorn Wesen (bjornw@axis.com)
10 * Revision 1.9 2003/07/04 08:27:54 starvik
11 * Merge of Linux 2.5.74
13 * Revision 1.8 2003/04/09 05:20:48 starvik
14 * Merge of Linux 2.5.67
16 * Revision 1.7 2003/01/22 06:48:38 starvik
17 * Fixed warnings issued by GCC 3.2.1
19 * Revision 1.6 2002/12/11 14:44:48 starvik
20 * Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/mm
22 * Revision 1.5 2002/11/18 07:37:37 starvik
23 * Added cache bug workaround (from Linux 2.4)
25 * Revision 1.4 2002/11/13 15:40:24 starvik
26 * Removed the page table cache stuff (as done in other archs)
28 * Revision 1.3 2002/11/05 06:45:13 starvik
29 * Merge of Linux 2.5.45
31 * Revision 1.2 2001/12/18 13:35:22 bjornw
32 * Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15).
34 * Revision 1.31 2001/11/13 16:22:00 bjornw
35 * Skip calculating totalram and sharedram in si_meminfo
37 * Revision 1.30 2001/11/12 19:02:10 pkj
38 * Fixed compiler warnings.
40 * Revision 1.29 2001/07/25 16:09:50 bjornw
41 * val->sharedram will stay 0
43 * Revision 1.28 2001/06/28 16:30:17 bjornw
44 * Oops. This needs to wait until 2.4.6 is merged
46 * Revision 1.27 2001/06/28 14:04:07 bjornw
49 * Revision 1.26 2001/06/18 06:36:02 hp
50 * Enable free_initmem of __init-type pages
52 * Revision 1.25 2001/06/13 00:02:23 bjornw
53 * Use a separate variable to store the current pgd to avoid races in schedule
55 * Revision 1.24 2001/05/15 00:52:20 hp
56 * Only map segment 0xa as seg if CONFIG_JULIETTE
58 * Revision 1.23 2001/04/04 14:35:40 bjornw
59 * * Removed get_pte_slow and friends (2.4.3 change)
60 * * Removed bad_pmd handling (2.4.3 change)
62 * Revision 1.22 2001/04/04 13:38:04 matsfg
63 * Moved ioremap to a separate function instead
65 * Revision 1.21 2001/03/27 09:28:33 bjornw
66 * ioremap used too early - lets try it in mem_init instead
68 * Revision 1.20 2001/03/23 07:39:21 starvik
69 * Corrected according to review remarks
71 * Revision 1.19 2001/03/15 14:25:17 bjornw
72 * More general shadow registers and ioremaped addresses for external I/O
74 * Revision 1.18 2001/02/23 12:46:44 bjornw
75 * * 0xc was not CSE1; 0x8 is, same as uncached flash, so we move the uncached
76 * flash during CRIS_LOW_MAP from 0xe to 0x8 so both the flash and the I/O
77 * is mapped straight over (for !CRIS_LOW_MAP the uncached flash is still 0xe)
79 * Revision 1.17 2001/02/22 15:05:21 bjornw
80 * Map 0x9 straight over during LOW_MAP to allow for memory mapped LEDs
82 * Revision 1.16 2001/02/22 15:02:35 bjornw
83 * Map 0xc straight over during LOW_MAP to allow for memory mapped I/O
85 * Revision 1.15 2001/01/10 21:12:10 bjornw
86 * loops_per_sec -> loops_per_jiffy
88 * Revision 1.14 2000/11/22 16:23:20 bjornw
89 * Initialize totalhigh counters to 0 to make /proc/meminfo look nice.
91 * Revision 1.13 2000/11/21 16:37:51 bjornw
92 * Temporarily disable initmem freeing
94 * Revision 1.12 2000/11/21 13:55:07 bjornw
95 * Use CONFIG_CRIS_LOW_MAP for the low VM map instead of explicit CPU type
97 * Revision 1.11 2000/10/06 12:38:22 bjornw
98 * Cast empty_bad_page correctly (should really be of * type from the start..
100 * Revision 1.10 2000/10/04 16:53:57 bjornw
101 * Fix memory-map due to LX features
103 * Revision 1.9 2000/09/13 15:47:49 bjornw
104 * Wrong count in reserved-pages loop
106 * Revision 1.8 2000/09/13 14:35:10 bjornw
107 * 2.4.0-test8 added a new arg to free_area_init_node
109 * Revision 1.7 2000/08/17 15:35:55 bjornw
110 * 2.4.0-test6 removed MAP_NR and inserted virt_to_page
115 #include <linux/init.h>
116 #include <linux/bootmem.h>
119 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
121 unsigned long empty_zero_page;
123 extern unsigned long loops_per_jiffy; /* init/main.c */
124 unsigned long loops_per_usec;
126 extern char _stext, _edata, _etext; /* From linkerscript */
127 extern char __init_begin, __init_end;
132 int i,free = 0,total = 0,cached = 0, reserved = 0, nonshared = 0;
135 printk("\nMem-info:\n");
137 printk("Free swap: %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
141 if (PageReserved(mem_map+i))
143 else if (PageSwapCache(mem_map+i))
145 else if (!page_count(mem_map+i))
147 else if (page_count(mem_map+i) == 1)
150 shared += page_count(mem_map+i) - 1;
152 printk("%d pages of RAM\n",total);
153 printk("%d free pages\n",free);
154 printk("%d reserved pages\n",reserved);
155 printk("%d pages nonshared\n",nonshared);
156 printk("%d pages shared\n",shared);
157 printk("%d pages swap cached\n",cached);
163 int codesize, reservedpages, datasize, initsize;
169 /* max/min_low_pfn was set by setup.c
170 * now we just copy it to some other necessary places...
172 * high_memory was also set in setup.c
175 max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
177 /* this will put all memory onto the freelists */
178 totalram_pages = free_all_bootmem();
181 for (tmp = 0; tmp < max_mapnr; tmp++) {
183 * Only count reserved RAM pages
185 if (PageReserved(mem_map + tmp))
189 codesize = (unsigned long) &_etext - (unsigned long) &_stext;
190 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
191 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
193 printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, "
195 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
196 max_mapnr << (PAGE_SHIFT-10),
198 reservedpages << (PAGE_SHIFT-10),
203 /* HACK alert - calculate a loops_per_usec for asm/delay.h here
204 * since this is called just after calibrate_delay in init/main.c
205 * but before places which use udelay. cannot be in time.c since
206 * that is called _before_ calibrate_delay
209 loops_per_usec = (loops_per_jiffy * HZ) / 1000000;
214 /* free the pages occupied by initialization code */
221 addr = (unsigned long)(&__init_begin);
222 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
223 ClearPageReserved(virt_to_page(addr));
224 set_page_count(virt_to_page(addr), 1);
228 printk ("Freeing unused kernel memory: %luk freed\n",
229 (unsigned long)((&__init_end - &__init_begin) >> 10));