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/nmi.h>
21 #include <linux/swap.h>
23 #include <asm/meminit.h>
24 #include <asm/pgalloc.h>
25 #include <asm/pgtable.h>
26 #include <asm/sections.h>
29 #ifdef CONFIG_VIRTUAL_MEM_MAP
30 static unsigned long max_gap
;
34 * show_mem - give short summary of memory stats
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.
41 int i
, total_reserved
= 0;
42 int total_shared
= 0, total_cached
= 0;
43 unsigned long total_present
= 0;
46 printk(KERN_INFO
"Mem-info:\n");
48 printk(KERN_INFO
"Node memory in pages:\n");
49 for_each_online_pgdat(pgdat
) {
50 unsigned long present
;
52 int shared
= 0, cached
= 0, reserved
= 0;
54 pgdat_resize_lock(pgdat
, &flags
);
55 present
= pgdat
->node_present_pages
;
56 for(i
= 0; i
< pgdat
->node_spanned_pages
; i
++) {
58 if (unlikely(i
% MAX_ORDER_NR_PAGES
== 0))
60 if (pfn_valid(pgdat
->node_start_pfn
+ i
))
61 page
= pfn_to_page(pgdat
->node_start_pfn
+ i
);
63 #ifdef CONFIG_VIRTUAL_MEM_MAP
64 if (max_gap
< LARGE_GAP
)
67 i
= vmemmap_find_next_valid_pfn(pgdat
->node_id
,
71 if (PageReserved(page
))
73 else if (PageSwapCache(page
))
75 else if (page_count(page
))
76 shared
+= page_count(page
)-1;
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
);
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",
92 quicklist_total_size());
93 printk(KERN_INFO
"%d free buffer pages\n", nr_free_buffer_pages());
97 /* physical address where the bootmem map is located */
98 unsigned long bootmap_start
;
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
106 * Find a place to put the bootmap and return its starting address in
107 * bootmap_start. This address must be page-aligned.
110 find_bootmap_location (unsigned long start
, unsigned long end
, void *arg
)
112 unsigned long needed
= *(unsigned long *)arg
;
113 unsigned long range_start
, range_end
, free_start
;
117 if (start
== PAGE_OFFSET
) {
124 free_start
= PAGE_OFFSET
;
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
);
130 free_start
= PAGE_ALIGN(rsvd_region
[i
].end
);
132 if (range_end
<= range_start
)
133 continue; /* skip over empty range */
135 if (range_end
- range_start
>= needed
) {
136 bootmap_start
= __pa(range_start
);
137 return -1; /* done */
140 /* nothing more available in this segment */
141 if (range_end
== end
)
148 static void *cpu_data
;
150 * per_cpu_init - setup per-cpu variables
152 * Allocate and setup per-cpu data areas.
158 static int first_time
=1;
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
166 void *cpu0_data
= __phys_per_cpu_start
- PERCPU_PAGE_SIZE
;
170 __per_cpu_offset
[0] = (char *) cpu0_data
- __per_cpu_start
;
171 per_cpu(local_per_cpu_offset
, 0) = __per_cpu_offset
[0];
173 for (cpu
= 1; cpu
< NR_CPUS
; cpu
++) {
174 memcpy(cpu_data
, __phys_per_cpu_start
, __per_cpu_end
- __per_cpu_start
);
175 __per_cpu_offset
[cpu
] = (char *) cpu_data
- __per_cpu_start
;
176 cpu_data
+= PERCPU_PAGE_SIZE
;
177 per_cpu(local_per_cpu_offset
, cpu
) = __per_cpu_offset
[cpu
];
180 return __per_cpu_start
+ __per_cpu_offset
[smp_processor_id()];
184 alloc_per_cpu_data(void)
186 cpu_data
= __alloc_bootmem(PERCPU_PAGE_SIZE
* NR_CPUS
-1,
187 PERCPU_PAGE_SIZE
, __pa(MAX_DMA_ADDRESS
));
190 #define alloc_per_cpu_data() do { } while (0)
191 #endif /* CONFIG_SMP */
194 * find_memory - setup memory map
196 * Walk the EFI memory map and find usable memory for the system, taking
197 * into account reserved areas.
202 unsigned long bootmap_size
;
206 /* first find highest page frame number */
209 efi_memmap_walk(find_max_min_low_pfn
, NULL
);
210 max_pfn
= max_low_pfn
;
211 /* how many bytes to cover all the pages */
212 bootmap_size
= bootmem_bootmap_pages(max_pfn
) << PAGE_SHIFT
;
214 /* look for a location to hold the bootmap */
215 bootmap_start
= ~0UL;
216 efi_memmap_walk(find_bootmap_location
, &bootmap_size
);
217 if (bootmap_start
== ~0UL)
218 panic("Cannot find %ld bytes for bootmap\n", bootmap_size
);
220 bootmap_size
= init_bootmem_node(NODE_DATA(0),
221 (bootmap_start
>> PAGE_SHIFT
), 0, max_pfn
);
223 /* Free all available memory, then mark bootmem-map as being in use. */
224 efi_memmap_walk(filter_rsvd_memory
, free_bootmem
);
225 reserve_bootmem(bootmap_start
, bootmap_size
, BOOTMEM_DEFAULT
);
229 alloc_per_cpu_data();
233 count_pages (u64 start
, u64 end
, void *arg
)
235 unsigned long *count
= arg
;
237 *count
+= (end
- start
) >> PAGE_SHIFT
;
242 * Set up the page tables.
248 unsigned long max_dma
;
249 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
252 efi_memmap_walk(count_pages
, &num_physpages
);
254 memset(max_zone_pfns
, 0, sizeof(max_zone_pfns
));
255 #ifdef CONFIG_ZONE_DMA
256 max_dma
= virt_to_phys((void *) MAX_DMA_ADDRESS
) >> PAGE_SHIFT
;
257 max_zone_pfns
[ZONE_DMA
] = max_dma
;
259 max_zone_pfns
[ZONE_NORMAL
] = max_low_pfn
;
261 #ifdef CONFIG_VIRTUAL_MEM_MAP
262 efi_memmap_walk(filter_memory
, register_active_ranges
);
263 efi_memmap_walk(find_largest_hole
, (u64
*)&max_gap
);
264 if (max_gap
< LARGE_GAP
) {
265 vmem_map
= (struct page
*) 0;
266 free_area_init_nodes(max_zone_pfns
);
268 unsigned long map_size
;
270 /* allocate virtual_mem_map */
272 map_size
= PAGE_ALIGN(ALIGN(max_low_pfn
, MAX_ORDER_NR_PAGES
) *
273 sizeof(struct page
));
274 vmalloc_end
-= map_size
;
275 vmem_map
= (struct page
*) vmalloc_end
;
276 efi_memmap_walk(create_mem_map_page_table
, NULL
);
279 * alloc_node_mem_map makes an adjustment for mem_map
280 * which isn't compatible with vmem_map.
282 NODE_DATA(0)->node_mem_map
= vmem_map
+
283 find_min_pfn_with_active_regions();
284 free_area_init_nodes(max_zone_pfns
);
286 printk("Virtual mem_map starts at 0x%p\n", mem_map
);
288 #else /* !CONFIG_VIRTUAL_MEM_MAP */
289 add_active_range(0, 0, max_low_pfn
);
290 free_area_init_nodes(max_zone_pfns
);
291 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
292 zero_page_memmap_ptr
= virt_to_page(ia64_imva(empty_zero_page
));