Commit | Line | Data |
---|---|---|
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 | /** | |
33 | * show_mem - display a memory statistics summary | |
34 | * | |
35 | * Just walks the pages in the system and describes where they're allocated. | |
36 | */ | |
37 | void | |
38 | show_mem (void) | |
39 | { | |
40 | int i, total = 0, reserved = 0; | |
41 | int shared = 0, cached = 0; | |
42 | ||
709a6c1c | 43 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 LT |
44 | show_free_areas(); |
45 | ||
709a6c1c JS |
46 | printk(KERN_INFO "Free swap: %6ldkB\n", |
47 | nr_swap_pages<<(PAGE_SHIFT-10)); | |
1da177e4 | 48 | i = max_mapnr; |
e44e41d0 BP |
49 | for (i = 0; i < max_mapnr; i++) { |
50 | if (!pfn_valid(i)) { | |
51 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
52 | if (max_gap < LARGE_GAP) | |
53 | continue; | |
54 | i = vmemmap_find_next_valid_pfn(0, i) - 1; | |
55 | #endif | |
1da177e4 | 56 | continue; |
e44e41d0 | 57 | } |
1da177e4 LT |
58 | total++; |
59 | if (PageReserved(mem_map+i)) | |
60 | reserved++; | |
61 | else if (PageSwapCache(mem_map+i)) | |
62 | cached++; | |
63 | else if (page_count(mem_map + i)) | |
64 | shared += page_count(mem_map + i) - 1; | |
65 | } | |
709a6c1c JS |
66 | printk(KERN_INFO "%d pages of RAM\n", total); |
67 | printk(KERN_INFO "%d reserved pages\n", reserved); | |
68 | printk(KERN_INFO "%d pages shared\n", shared); | |
69 | printk(KERN_INFO "%d pages swap cached\n", cached); | |
70 | printk(KERN_INFO "%ld pages in page table cache\n", | |
71 | pgtable_quicklist_total_size()); | |
1da177e4 LT |
72 | } |
73 | ||
74 | /* physical address where the bootmem map is located */ | |
75 | unsigned long bootmap_start; | |
76 | ||
77 | /** | |
78 | * find_max_pfn - adjust the maximum page number callback | |
79 | * @start: start of range | |
80 | * @end: end of range | |
81 | * @arg: address of pointer to global max_pfn variable | |
82 | * | |
83 | * Passed as a callback function to efi_memmap_walk() to determine the highest | |
84 | * available page frame number in the system. | |
85 | */ | |
86 | int | |
87 | find_max_pfn (unsigned long start, unsigned long end, void *arg) | |
88 | { | |
89 | unsigned long *max_pfnp = arg, pfn; | |
90 | ||
91 | pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT; | |
92 | if (pfn > *max_pfnp) | |
93 | *max_pfnp = pfn; | |
94 | return 0; | |
95 | } | |
96 | ||
97 | /** | |
98 | * find_bootmap_location - callback to find a memory area for the bootmap | |
99 | * @start: start of region | |
100 | * @end: end of region | |
101 | * @arg: unused callback data | |
102 | * | |
103 | * Find a place to put the bootmap and return its starting address in | |
104 | * bootmap_start. This address must be page-aligned. | |
105 | */ | |
dae28066 | 106 | static int __init |
1da177e4 LT |
107 | find_bootmap_location (unsigned long start, unsigned long end, void *arg) |
108 | { | |
109 | unsigned long needed = *(unsigned long *)arg; | |
110 | unsigned long range_start, range_end, free_start; | |
111 | int i; | |
112 | ||
113 | #if IGNORE_PFN0 | |
114 | if (start == PAGE_OFFSET) { | |
115 | start += PAGE_SIZE; | |
116 | if (start >= end) | |
117 | return 0; | |
118 | } | |
119 | #endif | |
120 | ||
121 | free_start = PAGE_OFFSET; | |
122 | ||
123 | for (i = 0; i < num_rsvd_regions; i++) { | |
124 | range_start = max(start, free_start); | |
125 | range_end = min(end, rsvd_region[i].start & PAGE_MASK); | |
126 | ||
127 | free_start = PAGE_ALIGN(rsvd_region[i].end); | |
128 | ||
129 | if (range_end <= range_start) | |
130 | continue; /* skip over empty range */ | |
131 | ||
132 | if (range_end - range_start >= needed) { | |
133 | bootmap_start = __pa(range_start); | |
134 | return -1; /* done */ | |
135 | } | |
136 | ||
137 | /* nothing more available in this segment */ | |
138 | if (range_end == end) | |
139 | return 0; | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
144 | /** | |
145 | * find_memory - setup memory map | |
146 | * | |
147 | * Walk the EFI memory map and find usable memory for the system, taking | |
148 | * into account reserved areas. | |
149 | */ | |
dae28066 | 150 | void __init |
1da177e4 LT |
151 | find_memory (void) |
152 | { | |
153 | unsigned long bootmap_size; | |
154 | ||
155 | reserve_memory(); | |
156 | ||
157 | /* first find highest page frame number */ | |
158 | max_pfn = 0; | |
159 | efi_memmap_walk(find_max_pfn, &max_pfn); | |
160 | ||
161 | /* how many bytes to cover all the pages */ | |
162 | bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT; | |
163 | ||
164 | /* look for a location to hold the bootmap */ | |
165 | bootmap_start = ~0UL; | |
166 | efi_memmap_walk(find_bootmap_location, &bootmap_size); | |
167 | if (bootmap_start == ~0UL) | |
168 | panic("Cannot find %ld bytes for bootmap\n", bootmap_size); | |
169 | ||
170 | bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn); | |
171 | ||
172 | /* Free all available memory, then mark bootmem-map as being in use. */ | |
173 | efi_memmap_walk(filter_rsvd_memory, free_bootmem); | |
174 | reserve_bootmem(bootmap_start, bootmap_size); | |
175 | ||
176 | find_initrd(); | |
45a98fc6 H |
177 | |
178 | #ifdef CONFIG_CRASH_DUMP | |
179 | /* If we are doing a crash dump, we still need to know the real mem | |
180 | * size before original memory map is * reset. */ | |
181 | saved_max_pfn = max_pfn; | |
182 | #endif | |
1da177e4 LT |
183 | } |
184 | ||
185 | #ifdef CONFIG_SMP | |
186 | /** | |
187 | * per_cpu_init - setup per-cpu variables | |
188 | * | |
189 | * Allocate and setup per-cpu data areas. | |
190 | */ | |
244fd545 | 191 | void * __cpuinit |
1da177e4 LT |
192 | per_cpu_init (void) |
193 | { | |
194 | void *cpu_data; | |
195 | int cpu; | |
ff741906 | 196 | static int first_time=1; |
1da177e4 LT |
197 | |
198 | /* | |
199 | * get_free_pages() cannot be used before cpu_init() done. BSP | |
200 | * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls | |
201 | * get_zeroed_page(). | |
202 | */ | |
ff741906 AR |
203 | if (first_time) { |
204 | first_time=0; | |
1da177e4 LT |
205 | cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS, |
206 | PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); | |
207 | for (cpu = 0; cpu < NR_CPUS; cpu++) { | |
208 | memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start); | |
209 | __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start; | |
210 | cpu_data += PERCPU_PAGE_SIZE; | |
211 | per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; | |
212 | } | |
213 | } | |
214 | return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; | |
215 | } | |
216 | #endif /* CONFIG_SMP */ | |
217 | ||
218 | static int | |
219 | count_pages (u64 start, u64 end, void *arg) | |
220 | { | |
221 | unsigned long *count = arg; | |
222 | ||
223 | *count += (end - start) >> PAGE_SHIFT; | |
224 | return 0; | |
225 | } | |
226 | ||
1da177e4 LT |
227 | /* |
228 | * Set up the page tables. | |
229 | */ | |
230 | ||
dae28066 | 231 | void __init |
1da177e4 LT |
232 | paging_init (void) |
233 | { | |
234 | unsigned long max_dma; | |
05e0caad MG |
235 | unsigned long nid = 0; |
236 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
1da177e4 LT |
237 | |
238 | num_physpages = 0; | |
239 | efi_memmap_walk(count_pages, &num_physpages); | |
240 | ||
241 | max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
6391af17 | 242 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
05e0caad MG |
243 | max_zone_pfns[ZONE_DMA] = max_dma; |
244 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
1da177e4 LT |
245 | |
246 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
05e0caad | 247 | efi_memmap_walk(register_active_ranges, &nid); |
1da177e4 LT |
248 | efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); |
249 | if (max_gap < LARGE_GAP) { | |
250 | vmem_map = (struct page *) 0; | |
05e0caad | 251 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
252 | } else { |
253 | unsigned long map_size; | |
254 | ||
255 | /* allocate virtual_mem_map */ | |
256 | ||
921eea1c BP |
257 | map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * |
258 | sizeof(struct page)); | |
1da177e4 LT |
259 | vmalloc_end -= map_size; |
260 | vmem_map = (struct page *) vmalloc_end; | |
261 | efi_memmap_walk(create_mem_map_page_table, NULL); | |
262 | ||
05e0caad MG |
263 | /* |
264 | * alloc_node_mem_map makes an adjustment for mem_map | |
265 | * which isn't compatible with vmem_map. | |
266 | */ | |
267 | NODE_DATA(0)->node_mem_map = vmem_map + | |
268 | find_min_pfn_with_active_regions(); | |
269 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 LT |
270 | |
271 | printk("Virtual mem_map starts at 0x%p\n", mem_map); | |
272 | } | |
273 | #else /* !CONFIG_VIRTUAL_MEM_MAP */ | |
05e0caad MG |
274 | add_active_range(0, 0, max_low_pfn); |
275 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 LT |
276 | #endif /* !CONFIG_VIRTUAL_MEM_MAP */ |
277 | zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); | |
278 | } |