ia64/linux-2.6.18-xen.hg

view arch/arm26/mm/init.c @ 647:a5bb490065f6

Fix the build after public header sync.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Wed Aug 13 14:01:49 2008 +0100 (2008-08-13)
parents 831230e53067
children
line source
1 /*
2 * linux/arch/arm26/mm/init.c
3 *
4 * Copyright (C) 1995-2002 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10 #include <linux/signal.h>
11 #include <linux/sched.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/types.h>
16 #include <linux/ptrace.h>
17 #include <linux/mman.h>
18 #include <linux/mm.h>
19 #include <linux/swap.h>
20 #include <linux/smp.h>
21 #include <linux/init.h>
22 #include <linux/initrd.h>
23 #include <linux/bootmem.h>
24 #include <linux/blkdev.h>
25 #include <linux/pfn.h>
27 #include <asm/segment.h>
28 #include <asm/mach-types.h>
29 #include <asm/dma.h>
30 #include <asm/hardware.h>
31 #include <asm/setup.h>
32 #include <asm/tlb.h>
34 #include <asm/map.h>
37 #define TABLE_SIZE PTRS_PER_PTE * sizeof(pte_t))
39 struct mmu_gather mmu_gathers[NR_CPUS];
41 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
42 extern char _stext, _text, _etext, _end, __init_begin, __init_end;
43 #ifdef CONFIG_XIP_KERNEL
44 extern char _endtext, _sdata;
45 #endif
46 extern unsigned long phys_initrd_start;
47 extern unsigned long phys_initrd_size;
49 /*
50 * The sole use of this is to pass memory configuration
51 * data from paging_init to mem_init.
52 */
53 static struct meminfo meminfo __initdata = { 0, };
55 /*
56 * empty_zero_page is a special page that is used for
57 * zero-initialized data and COW.
58 */
59 struct page *empty_zero_page;
61 void show_mem(void)
62 {
63 int free = 0, total = 0, reserved = 0;
64 int shared = 0, cached = 0, slab = 0;
65 struct page *page, *end;
67 printk("Mem-info:\n");
68 show_free_areas();
69 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
72 page = NODE_MEM_MAP(0);
73 end = page + NODE_DATA(0)->node_spanned_pages;
75 do {
76 total++;
77 if (PageReserved(page))
78 reserved++;
79 else if (PageSwapCache(page))
80 cached++;
81 else if (PageSlab(page))
82 slab++;
83 else if (!page_count(page))
84 free++;
85 else
86 shared += page_count(page) - 1;
87 page++;
88 } while (page < end);
90 printk("%d pages of RAM\n", total);
91 printk("%d free pages\n", free);
92 printk("%d reserved pages\n", reserved);
93 printk("%d slab pages\n", slab);
94 printk("%d pages shared\n", shared);
95 printk("%d pages swap cached\n", cached);
96 }
98 struct node_info {
99 unsigned int start;
100 unsigned int end;
101 int bootmap_pages;
102 };
104 /*
105 * FIXME: We really want to avoid allocating the bootmap bitmap
106 * over the top of the initrd. Hopefully, this is located towards
107 * the start of a bank, so if we allocate the bootmap bitmap at
108 * the end, we won't clash.
109 */
110 static unsigned int __init
111 find_bootmap_pfn(struct meminfo *mi, unsigned int bootmap_pages)
112 {
113 unsigned int start_pfn, bootmap_pfn;
114 unsigned int start, end;
116 start_pfn = PFN_UP((unsigned long)&_end);
117 bootmap_pfn = 0;
119 /* ARM26 machines only have one node */
120 if (mi->bank->node != 0)
121 BUG();
123 start = PFN_UP(mi->bank->start);
124 end = PFN_DOWN(mi->bank->size + mi->bank->start);
126 if (start < start_pfn)
127 start = start_pfn;
129 if (end <= start)
130 BUG();
132 if (end - start >= bootmap_pages)
133 bootmap_pfn = start;
134 else
135 BUG();
137 return bootmap_pfn;
138 }
140 /*
141 * Scan the memory info structure and pull out:
142 * - the end of memory
143 * - the number of nodes
144 * - the pfn range of each node
145 * - the number of bootmem bitmap pages
146 */
147 static void __init
148 find_memend_and_nodes(struct meminfo *mi, struct node_info *np)
149 {
150 unsigned int memend_pfn = 0;
152 nodes_clear(node_online_map);
153 node_set_online(0);
155 np->bootmap_pages = 0;
157 if (mi->bank->size == 0) {
158 BUG();
159 }
161 /*
162 * Get the start and end pfns for this bank
163 */
164 np->start = PFN_UP(mi->bank->start);
165 np->end = PFN_DOWN(mi->bank->start + mi->bank->size);
167 if (memend_pfn < np->end)
168 memend_pfn = np->end;
170 /*
171 * Calculate the number of pages we require to
172 * store the bootmem bitmaps.
173 */
174 np->bootmap_pages = bootmem_bootmap_pages(np->end - np->start);
176 /*
177 * This doesn't seem to be used by the Linux memory
178 * manager any more. If we can get rid of it, we
179 * also get rid of some of the stuff above as well.
180 */
181 max_low_pfn = memend_pfn - PFN_DOWN(PHYS_OFFSET);
182 max_pfn = memend_pfn - PFN_DOWN(PHYS_OFFSET);
183 mi->end = memend_pfn << PAGE_SHIFT;
185 }
187 /*
188 * Initialise the bootmem allocator for all nodes. This is called
189 * early during the architecture specific initialisation.
190 */
191 void __init bootmem_init(struct meminfo *mi)
192 {
193 struct node_info node_info;
194 unsigned int bootmap_pfn;
195 pg_data_t *pgdat = NODE_DATA(0);
197 find_memend_and_nodes(mi, &node_info);
199 bootmap_pfn = find_bootmap_pfn(mi, node_info.bootmap_pages);
201 /*
202 * Note that node 0 must always have some pages.
203 */
204 if (node_info.end == 0)
205 BUG();
207 /*
208 * Initialise the bootmem allocator.
209 */
210 init_bootmem_node(pgdat, bootmap_pfn, node_info.start, node_info.end);
212 /*
213 * Register all available RAM in this node with the bootmem allocator.
214 */
215 free_bootmem_node(pgdat, mi->bank->start, mi->bank->size);
217 /*
218 * Register the kernel text and data with bootmem.
219 * Note: with XIP we dont register .text since
220 * its in ROM.
221 */
222 #ifdef CONFIG_XIP_KERNEL
223 reserve_bootmem_node(pgdat, __pa(&_sdata), &_end - &_sdata);
224 #else
225 reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
226 #endif
228 /*
229 * And don't forget to reserve the allocator bitmap,
230 * which will be freed later.
231 */
232 reserve_bootmem_node(pgdat, bootmap_pfn << PAGE_SHIFT,
233 node_info.bootmap_pages << PAGE_SHIFT);
235 /*
236 * These should likewise go elsewhere. They pre-reserve
237 * the screen memory region at the start of main system
238 * memory. FIXME - screen RAM is not 512K!
239 */
240 reserve_bootmem_node(pgdat, 0x02000000, 0x00080000);
242 #ifdef CONFIG_BLK_DEV_INITRD
243 initrd_start = phys_initrd_start;
244 initrd_end = initrd_start + phys_initrd_size;
246 /* Achimedes machines only have one node, so initrd is in node 0 */
247 #ifdef CONFIG_XIP_KERNEL
248 /* Only reserve initrd space if it is in RAM */
249 if(initrd_start && initrd_start < 0x03000000){
250 #else
251 if(initrd_start){
252 #endif
253 reserve_bootmem_node(pgdat, __pa(initrd_start),
254 initrd_end - initrd_start);
255 }
256 #endif /* CONFIG_BLK_DEV_INITRD */
259 }
261 /*
262 * paging_init() sets up the page tables, initialises the zone memory
263 * maps, and sets up the zero page, bad page and bad page tables.
264 */
265 void __init paging_init(struct meminfo *mi)
266 {
267 void *zero_page;
268 unsigned long zone_size[MAX_NR_ZONES];
269 unsigned long zhole_size[MAX_NR_ZONES];
270 struct bootmem_data *bdata;
271 pg_data_t *pgdat;
272 int i;
274 memcpy(&meminfo, mi, sizeof(meminfo));
276 /*
277 * allocate the zero page. Note that we count on this going ok.
278 */
279 zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
281 /*
282 * initialise the page tables.
283 */
284 memtable_init(mi);
285 flush_tlb_all();
287 /*
288 * initialise the zones in node 0 (archimedes have only 1 node)
289 */
291 for (i = 0; i < MAX_NR_ZONES; i++) {
292 zone_size[i] = 0;
293 zhole_size[i] = 0;
294 }
296 pgdat = NODE_DATA(0);
297 bdata = pgdat->bdata;
298 zone_size[0] = bdata->node_low_pfn -
299 (bdata->node_boot_start >> PAGE_SHIFT);
300 if (!zone_size[0])
301 BUG();
302 pgdat->node_mem_map = NULL;
303 free_area_init_node(0, pgdat, zone_size,
304 bdata->node_boot_start >> PAGE_SHIFT, zhole_size);
306 /*
307 * finish off the bad pages once
308 * the mem_map is initialised
309 */
310 memzero(zero_page, PAGE_SIZE);
311 empty_zero_page = virt_to_page(zero_page);
312 }
314 static inline void free_area(unsigned long addr, unsigned long end, char *s)
315 {
316 unsigned int size = (end - addr) >> 10;
318 for (; addr < end; addr += PAGE_SIZE) {
319 struct page *page = virt_to_page(addr);
320 ClearPageReserved(page);
321 init_page_count(page);
322 free_page(addr);
323 totalram_pages++;
324 }
326 if (size && s)
327 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
328 }
330 /*
331 * mem_init() marks the free areas in the mem_map and tells us how much
332 * memory is free. This is done after various parts of the system have
333 * claimed their memory after the kernel image.
334 */
335 void __init mem_init(void)
336 {
337 unsigned int codepages, datapages, initpages;
338 pg_data_t *pgdat = NODE_DATA(0);
339 extern int sysctl_overcommit_memory;
342 /* Note: data pages includes BSS */
343 #ifdef CONFIG_XIP_KERNEL
344 codepages = &_endtext - &_text;
345 datapages = &_end - &_sdata;
346 #else
347 codepages = &_etext - &_text;
348 datapages = &_end - &_etext;
349 #endif
350 initpages = &__init_end - &__init_begin;
352 high_memory = (void *)__va(meminfo.end);
353 max_mapnr = virt_to_page(high_memory) - mem_map;
355 /* this will put all unused low memory onto the freelists */
356 if (pgdat->node_spanned_pages != 0)
357 totalram_pages += free_all_bootmem_node(pgdat);
359 num_physpages = meminfo.bank[0].size >> PAGE_SHIFT;
361 printk(KERN_INFO "Memory: %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
362 printk(KERN_NOTICE "Memory: %luKB available (%dK code, "
363 "%dK data, %dK init)\n",
364 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
365 codepages >> 10, datapages >> 10, initpages >> 10);
367 /*
368 * Turn on overcommit on tiny machines
369 */
370 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
371 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
372 printk("Turning on overcommit\n");
373 }
374 }
376 void free_initmem(void){
377 #ifndef CONFIG_XIP_KERNEL
378 free_area((unsigned long)(&__init_begin),
379 (unsigned long)(&__init_end),
380 "init");
381 #endif
382 }
384 #ifdef CONFIG_BLK_DEV_INITRD
386 static int keep_initrd;
388 void free_initrd_mem(unsigned long start, unsigned long end)
389 {
390 #ifdef CONFIG_XIP_KERNEL
391 /* Only bin initrd if it is in RAM... */
392 if(!keep_initrd && start < 0x03000000)
393 #else
394 if (!keep_initrd)
395 #endif
396 free_area(start, end, "initrd");
397 }
399 static int __init keepinitrd_setup(char *__unused)
400 {
401 keep_initrd = 1;
402 return 1;
403 }
405 __setup("keepinitrd", keepinitrd_setup);
406 #endif