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 - display a memory statistics summary
35 * Just walks the pages in the system and describes where they're allocated.
40 int i, total = 0, reserved = 0;
41 int shared = 0, cached = 0;
43 printk(KERN_INFO "Mem-info:\n");
46 printk(KERN_INFO "Free swap: %6ldkB\n",
47 nr_swap_pages<<(PAGE_SHIFT-10));
49 for (i = 0; i < max_mapnr; i++) {
51 #ifdef CONFIG_VIRTUAL_MEM_MAP
52 if (max_gap < LARGE_GAP)
54 i = vmemmap_find_next_valid_pfn(0, i) - 1;
59 if (PageReserved(mem_map+i))
61 else if (PageSwapCache(mem_map+i))
63 else if (page_count(mem_map + i))
64 shared += page_count(mem_map + i) - 1;
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());
74 /* physical address where the bootmem map is located */
75 unsigned long bootmap_start;
78 * find_max_pfn - adjust the maximum page number callback
79 * @start: start of range
81 * @arg: address of pointer to global max_pfn variable
83 * Passed as a callback function to efi_memmap_walk() to determine the highest
84 * available page frame number in the system.
87 find_max_pfn (unsigned long start, unsigned long end, void *arg)
89 unsigned long *max_pfnp = arg, pfn;
91 pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT;
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
103 * Find a place to put the bootmap and return its starting address in
104 * bootmap_start. This address must be page-aligned.
107 find_bootmap_location (unsigned long start, unsigned long end, void *arg)
109 unsigned long needed = *(unsigned long *)arg;
110 unsigned long range_start, range_end, free_start;
114 if (start == PAGE_OFFSET) {
121 free_start = PAGE_OFFSET;
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);
127 free_start = PAGE_ALIGN(rsvd_region[i].end);
129 if (range_end <= range_start)
130 continue; /* skip over empty range */
132 if (range_end - range_start >= needed) {
133 bootmap_start = __pa(range_start);
134 return -1; /* done */
137 /* nothing more available in this segment */
138 if (range_end == end)
145 * find_memory - setup memory map
147 * Walk the EFI memory map and find usable memory for the system, taking
148 * into account reserved areas.
153 unsigned long bootmap_size;
157 /* first find highest page frame number */
159 efi_memmap_walk(find_max_pfn, &max_pfn);
161 /* how many bytes to cover all the pages */
162 bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
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);
170 bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn);
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);
181 * per_cpu_init - setup per-cpu variables
183 * Allocate and setup per-cpu data areas.
190 static int first_time=1;
193 * get_free_pages() cannot be used before cpu_init() done. BSP
194 * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
199 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
200 PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
201 for (cpu = 0; cpu < NR_CPUS; cpu++) {
202 memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
203 __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
204 cpu_data += PERCPU_PAGE_SIZE;
205 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
208 return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
210 #endif /* CONFIG_SMP */
213 count_pages (u64 start, u64 end, void *arg)
215 unsigned long *count = arg;
217 *count += (end - start) >> PAGE_SHIFT;
222 * Set up the page tables.
228 unsigned long max_dma;
229 unsigned long nid = 0;
230 unsigned long max_zone_pfns[MAX_NR_ZONES];
233 efi_memmap_walk(count_pages, &num_physpages);
235 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
236 max_zone_pfns[ZONE_DMA] = max_dma;
237 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
239 #ifdef CONFIG_VIRTUAL_MEM_MAP
240 efi_memmap_walk(register_active_ranges, &nid);
241 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
242 if (max_gap < LARGE_GAP) {
243 vmem_map = (struct page *) 0;
244 free_area_init_nodes(max_zone_pfns);
246 unsigned long map_size;
248 /* allocate virtual_mem_map */
250 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
251 sizeof(struct page));
252 vmalloc_end -= map_size;
253 vmem_map = (struct page *) vmalloc_end;
254 efi_memmap_walk(create_mem_map_page_table, NULL);
257 * alloc_node_mem_map makes an adjustment for mem_map
258 * which isn't compatible with vmem_map.
260 NODE_DATA(0)->node_mem_map = vmem_map +
261 find_min_pfn_with_active_regions();
262 free_area_init_nodes(max_zone_pfns);
264 printk("Virtual mem_map starts at 0x%p\n", mem_map);
266 #else /* !CONFIG_VIRTUAL_MEM_MAP */
267 add_active_range(0, 0, max_low_pfn);
268 free_area_init_nodes(max_zone_pfns);
269 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
270 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));