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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> | |
99a19cf1 | 20 | #include <linux/nmi.h> |
1da177e4 LT |
21 | #include <linux/swap.h> |
22 | ||
23 | #include <asm/meminit.h> | |
24 | #include <asm/pgalloc.h> | |
25 | #include <asm/pgtable.h> | |
26 | #include <asm/sections.h> | |
27 | #include <asm/mca.h> | |
28 | ||
29 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
e44e41d0 | 30 | static unsigned long max_gap; |
1da177e4 LT |
31 | #endif |
32 | ||
33 | /** | |
f1c0afa2 | 34 | * show_mem - give short summary of memory stats |
1da177e4 | 35 | * |
f1c0afa2 GB |
36 | * Shows a simple page count of reserved and used pages in the system. |
37 | * For discontig machines, it does this on a per-pgdat basis. | |
1da177e4 | 38 | */ |
f1c0afa2 | 39 | void show_mem(void) |
1da177e4 | 40 | { |
f1c0afa2 GB |
41 | int i, total_reserved = 0; |
42 | int total_shared = 0, total_cached = 0; | |
43 | unsigned long total_present = 0; | |
44 | pg_data_t *pgdat; | |
1da177e4 | 45 | |
709a6c1c | 46 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 47 | show_free_areas(); |
709a6c1c JS |
48 | printk(KERN_INFO "Free swap: %6ldkB\n", |
49 | nr_swap_pages<<(PAGE_SHIFT-10)); | |
f1c0afa2 GB |
50 | printk(KERN_INFO "Node memory in pages:\n"); |
51 | for_each_online_pgdat(pgdat) { | |
52 | unsigned long present; | |
53 | unsigned long flags; | |
54 | int shared = 0, cached = 0, reserved = 0; | |
55 | ||
56 | pgdat_resize_lock(pgdat, &flags); | |
57 | present = pgdat->node_present_pages; | |
58 | for(i = 0; i < pgdat->node_spanned_pages; i++) { | |
59 | struct page *page; | |
99a19cf1 PB |
60 | if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) |
61 | touch_nmi_watchdog(); | |
f1c0afa2 GB |
62 | if (pfn_valid(pgdat->node_start_pfn + i)) |
63 | page = pfn_to_page(pgdat->node_start_pfn + i); | |
64 | else { | |
e44e41d0 | 65 | #ifdef CONFIG_VIRTUAL_MEM_MAP |
f1c0afa2 GB |
66 | if (max_gap < LARGE_GAP) |
67 | continue; | |
e44e41d0 | 68 | #endif |
f1c0afa2 GB |
69 | i = vmemmap_find_next_valid_pfn(pgdat->node_id, |
70 | i) - 1; | |
71 | continue; | |
72 | } | |
73 | if (PageReserved(page)) | |
74 | reserved++; | |
75 | else if (PageSwapCache(page)) | |
76 | cached++; | |
77 | else if (page_count(page)) | |
78 | shared += page_count(page)-1; | |
e44e41d0 | 79 | } |
f1c0afa2 GB |
80 | pgdat_resize_unlock(pgdat, &flags); |
81 | total_present += present; | |
82 | total_reserved += reserved; | |
83 | total_cached += cached; | |
84 | total_shared += shared; | |
85 | printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, " | |
86 | "shrd: %10d, swpd: %10d\n", pgdat->node_id, | |
87 | present, reserved, shared, cached); | |
1da177e4 | 88 | } |
f1c0afa2 GB |
89 | printk(KERN_INFO "%ld pages of RAM\n", total_present); |
90 | printk(KERN_INFO "%d reserved pages\n", total_reserved); | |
91 | printk(KERN_INFO "%d pages shared\n", total_shared); | |
92 | printk(KERN_INFO "%d pages swap cached\n", total_cached); | |
93 | printk(KERN_INFO "Total of %ld pages in page table cache\n", | |
2bd62a40 | 94 | quicklist_total_size()); |
f1c0afa2 | 95 | printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages()); |
1da177e4 LT |
96 | } |
97 | ||
f1c0afa2 | 98 | |
1da177e4 LT |
99 | /* physical address where the bootmem map is located */ |
100 | unsigned long bootmap_start; | |
101 | ||
1da177e4 LT |
102 | /** |
103 | * find_bootmap_location - callback to find a memory area for the bootmap | |
104 | * @start: start of region | |
105 | * @end: end of region | |
106 | * @arg: unused callback data | |
107 | * | |
108 | * Find a place to put the bootmap and return its starting address in | |
109 | * bootmap_start. This address must be page-aligned. | |
110 | */ | |
dae28066 | 111 | static int __init |
1da177e4 LT |
112 | find_bootmap_location (unsigned long start, unsigned long end, void *arg) |
113 | { | |
114 | unsigned long needed = *(unsigned long *)arg; | |
115 | unsigned long range_start, range_end, free_start; | |
116 | int i; | |
117 | ||
118 | #if IGNORE_PFN0 | |
119 | if (start == PAGE_OFFSET) { | |
120 | start += PAGE_SIZE; | |
121 | if (start >= end) | |
122 | return 0; | |
123 | } | |
124 | #endif | |
125 | ||
126 | free_start = PAGE_OFFSET; | |
127 | ||
128 | for (i = 0; i < num_rsvd_regions; i++) { | |
129 | range_start = max(start, free_start); | |
130 | range_end = min(end, rsvd_region[i].start & PAGE_MASK); | |
131 | ||
132 | free_start = PAGE_ALIGN(rsvd_region[i].end); | |
133 | ||
134 | if (range_end <= range_start) | |
135 | continue; /* skip over empty range */ | |
136 | ||
137 | if (range_end - range_start >= needed) { | |
138 | bootmap_start = __pa(range_start); | |
139 | return -1; /* done */ | |
140 | } | |
141 | ||
142 | /* nothing more available in this segment */ | |
143 | if (range_end == end) | |
144 | return 0; | |
145 | } | |
146 | return 0; | |
147 | } | |
148 | ||
4b9ddc7c TL |
149 | #ifdef CONFIG_SMP |
150 | static void *cpu_data; | |
151 | /** | |
152 | * per_cpu_init - setup per-cpu variables | |
153 | * | |
154 | * Allocate and setup per-cpu data areas. | |
155 | */ | |
156 | void * __cpuinit | |
157 | per_cpu_init (void) | |
158 | { | |
159 | int cpu; | |
160 | static int first_time=1; | |
161 | ||
162 | /* | |
163 | * get_free_pages() cannot be used before cpu_init() done. BSP | |
164 | * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls | |
165 | * get_zeroed_page(). | |
166 | */ | |
167 | if (first_time) { | |
168 | first_time=0; | |
169 | for (cpu = 0; cpu < NR_CPUS; cpu++) { | |
170 | memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start); | |
171 | __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start; | |
172 | cpu_data += PERCPU_PAGE_SIZE; | |
173 | per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; | |
174 | } | |
175 | } | |
176 | return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; | |
177 | } | |
178 | ||
179 | static inline void | |
180 | alloc_per_cpu_data(void) | |
181 | { | |
182 | cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS, | |
183 | PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); | |
184 | } | |
185 | #else | |
186 | #define alloc_per_cpu_data() do { } while (0) | |
187 | #endif /* CONFIG_SMP */ | |
188 | ||
1da177e4 LT |
189 | /** |
190 | * find_memory - setup memory map | |
191 | * | |
192 | * Walk the EFI memory map and find usable memory for the system, taking | |
193 | * into account reserved areas. | |
194 | */ | |
dae28066 | 195 | void __init |
1da177e4 LT |
196 | find_memory (void) |
197 | { | |
198 | unsigned long bootmap_size; | |
199 | ||
200 | reserve_memory(); | |
201 | ||
202 | /* first find highest page frame number */ | |
a3f5c338 ZN |
203 | min_low_pfn = ~0UL; |
204 | max_low_pfn = 0; | |
205 | efi_memmap_walk(find_max_min_low_pfn, NULL); | |
206 | max_pfn = max_low_pfn; | |
1da177e4 LT |
207 | /* how many bytes to cover all the pages */ |
208 | bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT; | |
209 | ||
210 | /* look for a location to hold the bootmap */ | |
211 | bootmap_start = ~0UL; | |
212 | efi_memmap_walk(find_bootmap_location, &bootmap_size); | |
213 | if (bootmap_start == ~0UL) | |
214 | panic("Cannot find %ld bytes for bootmap\n", bootmap_size); | |
215 | ||
a3f5c338 ZN |
216 | bootmap_size = init_bootmem_node(NODE_DATA(0), |
217 | (bootmap_start >> PAGE_SHIFT), 0, max_pfn); | |
1da177e4 LT |
218 | |
219 | /* Free all available memory, then mark bootmem-map as being in use. */ | |
220 | efi_memmap_walk(filter_rsvd_memory, free_bootmem); | |
72a7fe39 | 221 | reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT); |
1da177e4 LT |
222 | |
223 | find_initrd(); | |
45a98fc6 | 224 | |
4b9ddc7c | 225 | alloc_per_cpu_data(); |
1da177e4 LT |
226 | } |
227 | ||
1da177e4 LT |
228 | static int |
229 | count_pages (u64 start, u64 end, void *arg) | |
230 | { | |
231 | unsigned long *count = arg; | |
232 | ||
233 | *count += (end - start) >> PAGE_SHIFT; | |
234 | return 0; | |
235 | } | |
236 | ||
1da177e4 LT |
237 | /* |
238 | * Set up the page tables. | |
239 | */ | |
240 | ||
dae28066 | 241 | void __init |
1da177e4 LT |
242 | paging_init (void) |
243 | { | |
244 | unsigned long max_dma; | |
05e0caad | 245 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
1da177e4 LT |
246 | |
247 | num_physpages = 0; | |
248 | efi_memmap_walk(count_pages, &num_physpages); | |
249 | ||
6391af17 | 250 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
09ae1f58 CL |
251 | #ifdef CONFIG_ZONE_DMA |
252 | max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
05e0caad | 253 | max_zone_pfns[ZONE_DMA] = max_dma; |
09ae1f58 | 254 | #endif |
05e0caad | 255 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
1da177e4 LT |
256 | |
257 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
8b9c1068 | 258 | efi_memmap_walk(register_active_ranges, NULL); |
1da177e4 LT |
259 | efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); |
260 | if (max_gap < LARGE_GAP) { | |
261 | vmem_map = (struct page *) 0; | |
05e0caad | 262 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
263 | } else { |
264 | unsigned long map_size; | |
265 | ||
266 | /* allocate virtual_mem_map */ | |
267 | ||
921eea1c BP |
268 | map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * |
269 | sizeof(struct page)); | |
1da177e4 LT |
270 | vmalloc_end -= map_size; |
271 | vmem_map = (struct page *) vmalloc_end; | |
272 | efi_memmap_walk(create_mem_map_page_table, NULL); | |
273 | ||
05e0caad MG |
274 | /* |
275 | * alloc_node_mem_map makes an adjustment for mem_map | |
276 | * which isn't compatible with vmem_map. | |
277 | */ | |
278 | NODE_DATA(0)->node_mem_map = vmem_map + | |
279 | find_min_pfn_with_active_regions(); | |
280 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 LT |
281 | |
282 | printk("Virtual mem_map starts at 0x%p\n", mem_map); | |
283 | } | |
284 | #else /* !CONFIG_VIRTUAL_MEM_MAP */ | |
05e0caad MG |
285 | add_active_range(0, 0, max_low_pfn); |
286 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 LT |
287 | #endif /* !CONFIG_VIRTUAL_MEM_MAP */ |
288 | zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); | |
289 | } |