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
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.
14 * Routines used by ia64 machines with contiguous (or virtually contiguous)
17 #include <linux/bootmem.h>
18 #include <linux/efi.h>
20 #include <linux/swap.h>
22 #include <asm/meminit.h>
23 #include <asm/pgalloc.h>
24 #include <asm/pgtable.h>
25 #include <asm/sections.h>
28 #ifdef CONFIG_VIRTUAL_MEM_MAP
29 static unsigned long max_gap
;
33 * show_mem - give short summary of memory stats
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.
40 int i
, total_reserved
= 0;
41 int total_shared
= 0, total_cached
= 0;
42 unsigned long total_present
= 0;
45 printk(KERN_INFO
"Mem-info:\n");
47 printk(KERN_INFO
"Free swap: %6ldkB\n",
48 nr_swap_pages
<<(PAGE_SHIFT
-10));
49 printk(KERN_INFO
"Node memory in pages:\n");
50 for_each_online_pgdat(pgdat
) {
51 unsigned long present
;
53 int shared
= 0, cached
= 0, reserved
= 0;
55 pgdat_resize_lock(pgdat
, &flags
);
56 present
= pgdat
->node_present_pages
;
57 for(i
= 0; i
< pgdat
->node_spanned_pages
; i
++) {
59 if (pfn_valid(pgdat
->node_start_pfn
+ i
))
60 page
= pfn_to_page(pgdat
->node_start_pfn
+ i
);
62 #ifdef CONFIG_VIRTUAL_MEM_MAP
63 if (max_gap
< LARGE_GAP
)
66 i
= vmemmap_find_next_valid_pfn(pgdat
->node_id
,
70 if (PageReserved(page
))
72 else if (PageSwapCache(page
))
74 else if (page_count(page
))
75 shared
+= page_count(page
)-1;
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
);
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",
91 pgtable_quicklist_total_size());
92 printk(KERN_INFO
"%d free buffer pages\n", nr_free_buffer_pages());
96 /* physical address where the bootmem map is located */
97 unsigned long bootmap_start
;
100 * find_max_pfn - adjust the maximum page number callback
101 * @start: start of range
103 * @arg: address of pointer to global max_pfn variable
105 * Passed as a callback function to efi_memmap_walk() to determine the highest
106 * available page frame number in the system.
109 find_max_pfn (unsigned long start
, unsigned long end
, void *arg
)
111 unsigned long *max_pfnp
= arg
, pfn
;
113 pfn
= (PAGE_ALIGN(end
- 1) - PAGE_OFFSET
) >> PAGE_SHIFT
;
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
125 * Find a place to put the bootmap and return its starting address in
126 * bootmap_start. This address must be page-aligned.
129 find_bootmap_location (unsigned long start
, unsigned long end
, void *arg
)
131 unsigned long needed
= *(unsigned long *)arg
;
132 unsigned long range_start
, range_end
, free_start
;
136 if (start
== PAGE_OFFSET
) {
143 free_start
= PAGE_OFFSET
;
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
);
149 free_start
= PAGE_ALIGN(rsvd_region
[i
].end
);
151 if (range_end
<= range_start
)
152 continue; /* skip over empty range */
154 if (range_end
- range_start
>= needed
) {
155 bootmap_start
= __pa(range_start
);
156 return -1; /* done */
159 /* nothing more available in this segment */
160 if (range_end
== end
)
167 * find_memory - setup memory map
169 * Walk the EFI memory map and find usable memory for the system, taking
170 * into account reserved areas.
175 unsigned long bootmap_size
;
179 /* first find highest page frame number */
181 efi_memmap_walk(find_max_pfn
, &max_pfn
);
183 /* how many bytes to cover all the pages */
184 bootmap_size
= bootmem_bootmap_pages(max_pfn
) << PAGE_SHIFT
;
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
);
192 bootmap_size
= init_bootmem(bootmap_start
>> PAGE_SHIFT
, max_pfn
);
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
);
200 #ifdef CONFIG_CRASH_DUMP
201 /* If we are doing a crash dump, we still need to know the real mem
202 * size before original memory map is reset. */
203 saved_max_pfn
= max_pfn
;
209 * per_cpu_init - setup per-cpu variables
211 * Allocate and setup per-cpu data areas.
218 static int first_time
=1;
221 * get_free_pages() cannot be used before cpu_init() done. BSP
222 * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
227 cpu_data
= __alloc_bootmem(PERCPU_PAGE_SIZE
* NR_CPUS
,
228 PERCPU_PAGE_SIZE
, __pa(MAX_DMA_ADDRESS
));
229 for (cpu
= 0; cpu
< NR_CPUS
; cpu
++) {
230 memcpy(cpu_data
, __phys_per_cpu_start
, __per_cpu_end
- __per_cpu_start
);
231 __per_cpu_offset
[cpu
] = (char *) cpu_data
- __per_cpu_start
;
232 cpu_data
+= PERCPU_PAGE_SIZE
;
233 per_cpu(local_per_cpu_offset
, cpu
) = __per_cpu_offset
[cpu
];
236 return __per_cpu_start
+ __per_cpu_offset
[smp_processor_id()];
238 #endif /* CONFIG_SMP */
241 count_pages (u64 start
, u64 end
, void *arg
)
243 unsigned long *count
= arg
;
245 *count
+= (end
- start
) >> PAGE_SHIFT
;
250 * Set up the page tables.
256 unsigned long max_dma
;
257 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
260 efi_memmap_walk(count_pages
, &num_physpages
);
262 memset(max_zone_pfns
, 0, sizeof(max_zone_pfns
));
263 #ifdef CONFIG_ZONE_DMA
264 max_dma
= virt_to_phys((void *) MAX_DMA_ADDRESS
) >> PAGE_SHIFT
;
265 max_zone_pfns
[ZONE_DMA
] = max_dma
;
267 max_zone_pfns
[ZONE_NORMAL
] = max_low_pfn
;
269 #ifdef CONFIG_VIRTUAL_MEM_MAP
270 efi_memmap_walk(register_active_ranges
, NULL
);
271 efi_memmap_walk(find_largest_hole
, (u64
*)&max_gap
);
272 if (max_gap
< LARGE_GAP
) {
273 vmem_map
= (struct page
*) 0;
274 free_area_init_nodes(max_zone_pfns
);
276 unsigned long map_size
;
278 /* allocate virtual_mem_map */
280 map_size
= PAGE_ALIGN(ALIGN(max_low_pfn
, MAX_ORDER_NR_PAGES
) *
281 sizeof(struct page
));
282 vmalloc_end
-= map_size
;
283 vmem_map
= (struct page
*) vmalloc_end
;
284 efi_memmap_walk(create_mem_map_page_table
, NULL
);
287 * alloc_node_mem_map makes an adjustment for mem_map
288 * which isn't compatible with vmem_map.
290 NODE_DATA(0)->node_mem_map
= vmem_map
+
291 find_min_pfn_with_active_regions();
292 free_area_init_nodes(max_zone_pfns
);
294 printk("Virtual mem_map starts at 0x%p\n", mem_map
);
296 #else /* !CONFIG_VIRTUAL_MEM_MAP */
297 add_active_range(0, 0, max_low_pfn
);
298 free_area_init_nodes(max_zone_pfns
);
299 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
300 zero_page_memmap_ptr
= virt_to_page(ia64_imva(empty_zero_page
));