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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1998-2003 Hewlett-Packard Co | |
7 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
8 | * Stephane Eranian <eranian@hpl.hp.com> | |
9 | * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com> | |
10 | * Copyright (C) 1999 VA Linux Systems | |
11 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
12 | * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved. | |
13 | * | |
14 | * Routines used by ia64 machines with contiguous (or virtually contiguous) | |
15 | * memory. | |
16 | */ | |
1da177e4 LT |
17 | #include <linux/bootmem.h> |
18 | #include <linux/efi.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/swap.h> | |
21 | ||
22 | #include <asm/meminit.h> | |
23 | #include <asm/pgalloc.h> | |
24 | #include <asm/pgtable.h> | |
25 | #include <asm/sections.h> | |
26 | #include <asm/mca.h> | |
27 | ||
28 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
e44e41d0 | 29 | static unsigned long max_gap; |
1da177e4 LT |
30 | #endif |
31 | ||
32 | /** | |
f1c0afa2 | 33 | * show_mem - give short summary of memory stats |
1da177e4 | 34 | * |
f1c0afa2 GB |
35 | * Shows a simple page count of reserved and used pages in the system. |
36 | * For discontig machines, it does this on a per-pgdat basis. | |
1da177e4 | 37 | */ |
f1c0afa2 | 38 | void show_mem(void) |
1da177e4 | 39 | { |
f1c0afa2 GB |
40 | int i, total_reserved = 0; |
41 | int total_shared = 0, total_cached = 0; | |
42 | unsigned long total_present = 0; | |
43 | pg_data_t *pgdat; | |
1da177e4 | 44 | |
709a6c1c | 45 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 46 | show_free_areas(); |
709a6c1c JS |
47 | printk(KERN_INFO "Free swap: %6ldkB\n", |
48 | nr_swap_pages<<(PAGE_SHIFT-10)); | |
f1c0afa2 GB |
49 | printk(KERN_INFO "Node memory in pages:\n"); |
50 | for_each_online_pgdat(pgdat) { | |
51 | unsigned long present; | |
52 | unsigned long flags; | |
53 | int shared = 0, cached = 0, reserved = 0; | |
54 | ||
55 | pgdat_resize_lock(pgdat, &flags); | |
56 | present = pgdat->node_present_pages; | |
57 | for(i = 0; i < pgdat->node_spanned_pages; i++) { | |
58 | struct page *page; | |
59 | if (pfn_valid(pgdat->node_start_pfn + i)) | |
60 | page = pfn_to_page(pgdat->node_start_pfn + i); | |
61 | else { | |
e44e41d0 | 62 | #ifdef CONFIG_VIRTUAL_MEM_MAP |
f1c0afa2 GB |
63 | if (max_gap < LARGE_GAP) |
64 | continue; | |
e44e41d0 | 65 | #endif |
f1c0afa2 GB |
66 | i = vmemmap_find_next_valid_pfn(pgdat->node_id, |
67 | i) - 1; | |
68 | continue; | |
69 | } | |
70 | if (PageReserved(page)) | |
71 | reserved++; | |
72 | else if (PageSwapCache(page)) | |
73 | cached++; | |
74 | else if (page_count(page)) | |
75 | shared += page_count(page)-1; | |
e44e41d0 | 76 | } |
f1c0afa2 GB |
77 | pgdat_resize_unlock(pgdat, &flags); |
78 | total_present += present; | |
79 | total_reserved += reserved; | |
80 | total_cached += cached; | |
81 | total_shared += shared; | |
82 | printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, " | |
83 | "shrd: %10d, swpd: %10d\n", pgdat->node_id, | |
84 | present, reserved, shared, cached); | |
1da177e4 | 85 | } |
f1c0afa2 GB |
86 | printk(KERN_INFO "%ld pages of RAM\n", total_present); |
87 | printk(KERN_INFO "%d reserved pages\n", total_reserved); | |
88 | printk(KERN_INFO "%d pages shared\n", total_shared); | |
89 | printk(KERN_INFO "%d pages swap cached\n", total_cached); | |
90 | printk(KERN_INFO "Total of %ld pages in page table cache\n", | |
709a6c1c | 91 | pgtable_quicklist_total_size()); |
f1c0afa2 | 92 | printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages()); |
1da177e4 LT |
93 | } |
94 | ||
f1c0afa2 | 95 | |
1da177e4 LT |
96 | /* physical address where the bootmem map is located */ |
97 | unsigned long bootmap_start; | |
98 | ||
99 | /** | |
100 | * find_max_pfn - adjust the maximum page number callback | |
101 | * @start: start of range | |
102 | * @end: end of range | |
103 | * @arg: address of pointer to global max_pfn variable | |
104 | * | |
105 | * Passed as a callback function to efi_memmap_walk() to determine the highest | |
106 | * available page frame number in the system. | |
107 | */ | |
108 | int | |
109 | find_max_pfn (unsigned long start, unsigned long end, void *arg) | |
110 | { | |
111 | unsigned long *max_pfnp = arg, pfn; | |
112 | ||
113 | pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT; | |
114 | if (pfn > *max_pfnp) | |
115 | *max_pfnp = pfn; | |
116 | return 0; | |
117 | } | |
118 | ||
119 | /** | |
120 | * find_bootmap_location - callback to find a memory area for the bootmap | |
121 | * @start: start of region | |
122 | * @end: end of region | |
123 | * @arg: unused callback data | |
124 | * | |
125 | * Find a place to put the bootmap and return its starting address in | |
126 | * bootmap_start. This address must be page-aligned. | |
127 | */ | |
dae28066 | 128 | static int __init |
1da177e4 LT |
129 | find_bootmap_location (unsigned long start, unsigned long end, void *arg) |
130 | { | |
131 | unsigned long needed = *(unsigned long *)arg; | |
132 | unsigned long range_start, range_end, free_start; | |
133 | int i; | |
134 | ||
135 | #if IGNORE_PFN0 | |
136 | if (start == PAGE_OFFSET) { | |
137 | start += PAGE_SIZE; | |
138 | if (start >= end) | |
139 | return 0; | |
140 | } | |
141 | #endif | |
142 | ||
143 | free_start = PAGE_OFFSET; | |
144 | ||
145 | for (i = 0; i < num_rsvd_regions; i++) { | |
146 | range_start = max(start, free_start); | |
147 | range_end = min(end, rsvd_region[i].start & PAGE_MASK); | |
148 | ||
149 | free_start = PAGE_ALIGN(rsvd_region[i].end); | |
150 | ||
151 | if (range_end <= range_start) | |
152 | continue; /* skip over empty range */ | |
153 | ||
154 | if (range_end - range_start >= needed) { | |
155 | bootmap_start = __pa(range_start); | |
156 | return -1; /* done */ | |
157 | } | |
158 | ||
159 | /* nothing more available in this segment */ | |
160 | if (range_end == end) | |
161 | return 0; | |
162 | } | |
163 | return 0; | |
164 | } | |
165 | ||
166 | /** | |
167 | * find_memory - setup memory map | |
168 | * | |
169 | * Walk the EFI memory map and find usable memory for the system, taking | |
170 | * into account reserved areas. | |
171 | */ | |
dae28066 | 172 | void __init |
1da177e4 LT |
173 | find_memory (void) |
174 | { | |
175 | unsigned long bootmap_size; | |
176 | ||
177 | reserve_memory(); | |
178 | ||
179 | /* first find highest page frame number */ | |
180 | max_pfn = 0; | |
181 | efi_memmap_walk(find_max_pfn, &max_pfn); | |
182 | ||
183 | /* how many bytes to cover all the pages */ | |
184 | bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT; | |
185 | ||
186 | /* look for a location to hold the bootmap */ | |
187 | bootmap_start = ~0UL; | |
188 | efi_memmap_walk(find_bootmap_location, &bootmap_size); | |
189 | if (bootmap_start == ~0UL) | |
190 | panic("Cannot find %ld bytes for bootmap\n", bootmap_size); | |
191 | ||
192 | bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn); | |
193 | ||
194 | /* Free all available memory, then mark bootmem-map as being in use. */ | |
195 | efi_memmap_walk(filter_rsvd_memory, free_bootmem); | |
196 | reserve_bootmem(bootmap_start, bootmap_size); | |
197 | ||
198 | find_initrd(); | |
45a98fc6 | 199 | |
1da177e4 LT |
200 | } |
201 | ||
202 | #ifdef CONFIG_SMP | |
203 | /** | |
204 | * per_cpu_init - setup per-cpu variables | |
205 | * | |
206 | * Allocate and setup per-cpu data areas. | |
207 | */ | |
244fd545 | 208 | void * __cpuinit |
1da177e4 LT |
209 | per_cpu_init (void) |
210 | { | |
211 | void *cpu_data; | |
212 | int cpu; | |
ff741906 | 213 | static int first_time=1; |
1da177e4 LT |
214 | |
215 | /* | |
216 | * get_free_pages() cannot be used before cpu_init() done. BSP | |
217 | * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls | |
218 | * get_zeroed_page(). | |
219 | */ | |
ff741906 AR |
220 | if (first_time) { |
221 | first_time=0; | |
1da177e4 LT |
222 | cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS, |
223 | PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); | |
224 | for (cpu = 0; cpu < NR_CPUS; cpu++) { | |
225 | memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start); | |
226 | __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start; | |
227 | cpu_data += PERCPU_PAGE_SIZE; | |
228 | per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; | |
229 | } | |
230 | } | |
231 | return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; | |
232 | } | |
233 | #endif /* CONFIG_SMP */ | |
234 | ||
235 | static int | |
236 | count_pages (u64 start, u64 end, void *arg) | |
237 | { | |
238 | unsigned long *count = arg; | |
239 | ||
240 | *count += (end - start) >> PAGE_SHIFT; | |
241 | return 0; | |
242 | } | |
243 | ||
1da177e4 LT |
244 | /* |
245 | * Set up the page tables. | |
246 | */ | |
247 | ||
dae28066 | 248 | void __init |
1da177e4 LT |
249 | paging_init (void) |
250 | { | |
251 | unsigned long max_dma; | |
05e0caad | 252 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
1da177e4 LT |
253 | |
254 | num_physpages = 0; | |
255 | efi_memmap_walk(count_pages, &num_physpages); | |
256 | ||
6391af17 | 257 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
09ae1f58 CL |
258 | #ifdef CONFIG_ZONE_DMA |
259 | max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
05e0caad | 260 | max_zone_pfns[ZONE_DMA] = max_dma; |
09ae1f58 | 261 | #endif |
05e0caad | 262 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
1da177e4 LT |
263 | |
264 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
8b9c1068 | 265 | efi_memmap_walk(register_active_ranges, NULL); |
1da177e4 LT |
266 | efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); |
267 | if (max_gap < LARGE_GAP) { | |
268 | vmem_map = (struct page *) 0; | |
05e0caad | 269 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
270 | } else { |
271 | unsigned long map_size; | |
272 | ||
273 | /* allocate virtual_mem_map */ | |
274 | ||
921eea1c BP |
275 | map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * |
276 | sizeof(struct page)); | |
1da177e4 LT |
277 | vmalloc_end -= map_size; |
278 | vmem_map = (struct page *) vmalloc_end; | |
279 | efi_memmap_walk(create_mem_map_page_table, NULL); | |
280 | ||
05e0caad MG |
281 | /* |
282 | * alloc_node_mem_map makes an adjustment for mem_map | |
283 | * which isn't compatible with vmem_map. | |
284 | */ | |
285 | NODE_DATA(0)->node_mem_map = vmem_map + | |
286 | find_min_pfn_with_active_regions(); | |
287 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 LT |
288 | |
289 | printk("Virtual mem_map starts at 0x%p\n", mem_map); | |
290 | } | |
291 | #else /* !CONFIG_VIRTUAL_MEM_MAP */ | |
05e0caad MG |
292 | add_active_range(0, 0, max_low_pfn); |
293 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 LT |
294 | #endif /* !CONFIG_VIRTUAL_MEM_MAP */ |
295 | zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); | |
296 | } |