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CommitLineData
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
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17#include <linux/bootmem.h>
18#include <linux/efi.h>
19#include <linux/mm.h>
99a19cf1 20#include <linux/nmi.h>
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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 30static unsigned long max_gap;
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31#endif
32
33/**
f1c0afa2 34 * show_mem - give short summary of memory stats
1da177e4 35 *
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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 39void show_mem(void)
1da177e4 40{
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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();
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48 printk(KERN_INFO "Node memory in pages:\n");
49 for_each_online_pgdat(pgdat) {
50 unsigned long present;
51 unsigned long flags;
52 int shared = 0, cached = 0, reserved = 0;
53
54 pgdat_resize_lock(pgdat, &flags);
55 present = pgdat->node_present_pages;
56 for(i = 0; i < pgdat->node_spanned_pages; i++) {
57 struct page *page;
99a19cf1
PB
58 if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
59 touch_nmi_watchdog();
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60 if (pfn_valid(pgdat->node_start_pfn + i))
61 page = pfn_to_page(pgdat->node_start_pfn + i);
62 else {
e44e41d0 63#ifdef CONFIG_VIRTUAL_MEM_MAP
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64 if (max_gap < LARGE_GAP)
65 continue;
e44e41d0 66#endif
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67 i = vmemmap_find_next_valid_pfn(pgdat->node_id,
68 i) - 1;
69 continue;
70 }
71 if (PageReserved(page))
72 reserved++;
73 else if (PageSwapCache(page))
74 cached++;
75 else if (page_count(page))
76 shared += page_count(page)-1;
e44e41d0 77 }
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78 pgdat_resize_unlock(pgdat, &flags);
79 total_present += present;
80 total_reserved += reserved;
81 total_cached += cached;
82 total_shared += shared;
83 printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, "
84 "shrd: %10d, swpd: %10d\n", pgdat->node_id,
85 present, reserved, shared, cached);
1da177e4 86 }
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87 printk(KERN_INFO "%ld pages of RAM\n", total_present);
88 printk(KERN_INFO "%d reserved pages\n", total_reserved);
89 printk(KERN_INFO "%d pages shared\n", total_shared);
90 printk(KERN_INFO "%d pages swap cached\n", total_cached);
91 printk(KERN_INFO "Total of %ld pages in page table cache\n",
2bd62a40 92 quicklist_total_size());
f1c0afa2 93 printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages());
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94}
95
f1c0afa2 96
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97/* physical address where the bootmem map is located */
98unsigned long bootmap_start;
99
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100/**
101 * find_bootmap_location - callback to find a memory area for the bootmap
102 * @start: start of region
103 * @end: end of region
104 * @arg: unused callback data
105 *
106 * Find a place to put the bootmap and return its starting address in
107 * bootmap_start. This address must be page-aligned.
108 */
dae28066 109static int __init
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110find_bootmap_location (unsigned long start, unsigned long end, void *arg)
111{
112 unsigned long needed = *(unsigned long *)arg;
113 unsigned long range_start, range_end, free_start;
114 int i;
115
116#if IGNORE_PFN0
117 if (start == PAGE_OFFSET) {
118 start += PAGE_SIZE;
119 if (start >= end)
120 return 0;
121 }
122#endif
123
124 free_start = PAGE_OFFSET;
125
126 for (i = 0; i < num_rsvd_regions; i++) {
127 range_start = max(start, free_start);
128 range_end = min(end, rsvd_region[i].start & PAGE_MASK);
129
130 free_start = PAGE_ALIGN(rsvd_region[i].end);
131
132 if (range_end <= range_start)
133 continue; /* skip over empty range */
134
135 if (range_end - range_start >= needed) {
136 bootmap_start = __pa(range_start);
137 return -1; /* done */
138 }
139
140 /* nothing more available in this segment */
141 if (range_end == end)
142 return 0;
143 }
144 return 0;
145}
146
4b9ddc7c
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147#ifdef CONFIG_SMP
148static void *cpu_data;
149/**
150 * per_cpu_init - setup per-cpu variables
151 *
152 * Allocate and setup per-cpu data areas.
153 */
154void * __cpuinit
155per_cpu_init (void)
156{
157 int cpu;
158 static int first_time=1;
159
160 /*
161 * get_free_pages() cannot be used before cpu_init() done. BSP
162 * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
163 * get_zeroed_page().
164 */
165 if (first_time) {
166 first_time=0;
167 for (cpu = 0; cpu < NR_CPUS; cpu++) {
168 memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
169 __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
170 cpu_data += PERCPU_PAGE_SIZE;
171 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
172 }
173 }
174 return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
175}
176
177static inline void
178alloc_per_cpu_data(void)
179{
180 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
181 PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
182}
183#else
184#define alloc_per_cpu_data() do { } while (0)
185#endif /* CONFIG_SMP */
186
1da177e4
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187/**
188 * find_memory - setup memory map
189 *
190 * Walk the EFI memory map and find usable memory for the system, taking
191 * into account reserved areas.
192 */
dae28066 193void __init
1da177e4
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194find_memory (void)
195{
196 unsigned long bootmap_size;
197
198 reserve_memory();
199
200 /* first find highest page frame number */
a3f5c338
ZN
201 min_low_pfn = ~0UL;
202 max_low_pfn = 0;
203 efi_memmap_walk(find_max_min_low_pfn, NULL);
204 max_pfn = max_low_pfn;
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205 /* how many bytes to cover all the pages */
206 bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
207
208 /* look for a location to hold the bootmap */
209 bootmap_start = ~0UL;
210 efi_memmap_walk(find_bootmap_location, &bootmap_size);
211 if (bootmap_start == ~0UL)
212 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
213
a3f5c338
ZN
214 bootmap_size = init_bootmem_node(NODE_DATA(0),
215 (bootmap_start >> PAGE_SHIFT), 0, max_pfn);
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216
217 /* Free all available memory, then mark bootmem-map as being in use. */
218 efi_memmap_walk(filter_rsvd_memory, free_bootmem);
72a7fe39 219 reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
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220
221 find_initrd();
45a98fc6 222
4b9ddc7c 223 alloc_per_cpu_data();
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224}
225
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226static int
227count_pages (u64 start, u64 end, void *arg)
228{
229 unsigned long *count = arg;
230
231 *count += (end - start) >> PAGE_SHIFT;
232 return 0;
233}
234
1da177e4
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235/*
236 * Set up the page tables.
237 */
238
dae28066 239void __init
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240paging_init (void)
241{
242 unsigned long max_dma;
05e0caad 243 unsigned long max_zone_pfns[MAX_NR_ZONES];
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244
245 num_physpages = 0;
246 efi_memmap_walk(count_pages, &num_physpages);
247
6391af17 248 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
09ae1f58
CL
249#ifdef CONFIG_ZONE_DMA
250 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
05e0caad 251 max_zone_pfns[ZONE_DMA] = max_dma;
09ae1f58 252#endif
05e0caad 253 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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254
255#ifdef CONFIG_VIRTUAL_MEM_MAP
98075d24 256 efi_memmap_walk(filter_memory, register_active_ranges);
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257 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
258 if (max_gap < LARGE_GAP) {
259 vmem_map = (struct page *) 0;
05e0caad 260 free_area_init_nodes(max_zone_pfns);
1da177e4
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261 } else {
262 unsigned long map_size;
263
264 /* allocate virtual_mem_map */
265
921eea1c
BP
266 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
267 sizeof(struct page));
1da177e4
LT
268 vmalloc_end -= map_size;
269 vmem_map = (struct page *) vmalloc_end;
270 efi_memmap_walk(create_mem_map_page_table, NULL);
271
05e0caad
MG
272 /*
273 * alloc_node_mem_map makes an adjustment for mem_map
274 * which isn't compatible with vmem_map.
275 */
276 NODE_DATA(0)->node_mem_map = vmem_map +
277 find_min_pfn_with_active_regions();
278 free_area_init_nodes(max_zone_pfns);
1da177e4
LT
279
280 printk("Virtual mem_map starts at 0x%p\n", mem_map);
281 }
282#else /* !CONFIG_VIRTUAL_MEM_MAP */
05e0caad
MG
283 add_active_range(0, 0, max_low_pfn);
284 free_area_init_nodes(max_zone_pfns);
1da177e4
LT
285#endif /* !CONFIG_VIRTUAL_MEM_MAP */
286 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
287}