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/config.h>
18 #include <linux/bootmem.h>
19 #include <linux/efi.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 num_dma_physpages;
34 * show_mem - display a memory statistics summary
36 * Just walks the pages in the system and describes where they're allocated.
41 int i, total = 0, reserved = 0;
42 int shared = 0, cached = 0;
44 printk("Mem-info:\n");
47 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
53 if (PageReserved(mem_map+i))
55 else if (PageSwapCache(mem_map+i))
57 else if (page_count(mem_map + i))
58 shared += page_count(mem_map + i) - 1;
60 printk("%d pages of RAM\n", total);
61 printk("%d reserved pages\n", reserved);
62 printk("%d pages shared\n", shared);
63 printk("%d pages swap cached\n", cached);
64 printk("%ld pages in page table cache\n",
65 pgtable_quicklist_total_size());
68 /* physical address where the bootmem map is located */
69 unsigned long bootmap_start;
72 * find_max_pfn - adjust the maximum page number callback
73 * @start: start of range
75 * @arg: address of pointer to global max_pfn variable
77 * Passed as a callback function to efi_memmap_walk() to determine the highest
78 * available page frame number in the system.
81 find_max_pfn (unsigned long start, unsigned long end, void *arg)
83 unsigned long *max_pfnp = arg, pfn;
85 pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT;
92 * find_bootmap_location - callback to find a memory area for the bootmap
93 * @start: start of region
95 * @arg: unused callback data
97 * Find a place to put the bootmap and return its starting address in
98 * bootmap_start. This address must be page-aligned.
101 find_bootmap_location (unsigned long start, unsigned long end, void *arg)
103 unsigned long needed = *(unsigned long *)arg;
104 unsigned long range_start, range_end, free_start;
108 if (start == PAGE_OFFSET) {
115 free_start = PAGE_OFFSET;
117 for (i = 0; i < num_rsvd_regions; i++) {
118 range_start = max(start, free_start);
119 range_end = min(end, rsvd_region[i].start & PAGE_MASK);
121 free_start = PAGE_ALIGN(rsvd_region[i].end);
123 if (range_end <= range_start)
124 continue; /* skip over empty range */
126 if (range_end - range_start >= needed) {
127 bootmap_start = __pa(range_start);
128 return -1; /* done */
131 /* nothing more available in this segment */
132 if (range_end == end)
139 * find_memory - setup memory map
141 * Walk the EFI memory map and find usable memory for the system, taking
142 * into account reserved areas.
147 unsigned long bootmap_size;
151 /* first find highest page frame number */
153 efi_memmap_walk(find_max_pfn, &max_pfn);
155 /* how many bytes to cover all the pages */
156 bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
158 /* look for a location to hold the bootmap */
159 bootmap_start = ~0UL;
160 efi_memmap_walk(find_bootmap_location, &bootmap_size);
161 if (bootmap_start == ~0UL)
162 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
164 bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn);
166 /* Free all available memory, then mark bootmem-map as being in use. */
167 efi_memmap_walk(filter_rsvd_memory, free_bootmem);
168 reserve_bootmem(bootmap_start, bootmap_size);
175 * per_cpu_init - setup per-cpu variables
177 * Allocate and setup per-cpu data areas.
184 static int first_time=1;
187 * get_free_pages() cannot be used before cpu_init() done. BSP
188 * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
193 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
194 PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
195 for (cpu = 0; cpu < NR_CPUS; cpu++) {
196 memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
197 __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
198 cpu_data += PERCPU_PAGE_SIZE;
199 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
202 return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
204 #endif /* CONFIG_SMP */
207 count_pages (u64 start, u64 end, void *arg)
209 unsigned long *count = arg;
211 *count += (end - start) >> PAGE_SHIFT;
215 #ifdef CONFIG_VIRTUAL_MEM_MAP
217 count_dma_pages (u64 start, u64 end, void *arg)
219 unsigned long *count = arg;
221 if (start < MAX_DMA_ADDRESS)
222 *count += (min(end, MAX_DMA_ADDRESS) - start) >> PAGE_SHIFT;
228 * Set up the page tables.
234 unsigned long max_dma;
235 unsigned long zones_size[MAX_NR_ZONES];
236 #ifdef CONFIG_VIRTUAL_MEM_MAP
237 unsigned long zholes_size[MAX_NR_ZONES];
238 unsigned long max_gap;
241 /* initialize mem_map[] */
243 memset(zones_size, 0, sizeof(zones_size));
246 efi_memmap_walk(count_pages, &num_physpages);
248 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
250 #ifdef CONFIG_VIRTUAL_MEM_MAP
251 memset(zholes_size, 0, sizeof(zholes_size));
253 num_dma_physpages = 0;
254 efi_memmap_walk(count_dma_pages, &num_dma_physpages);
256 if (max_low_pfn < max_dma) {
257 zones_size[ZONE_DMA] = max_low_pfn;
258 zholes_size[ZONE_DMA] = max_low_pfn - num_dma_physpages;
260 zones_size[ZONE_DMA] = max_dma;
261 zholes_size[ZONE_DMA] = max_dma - num_dma_physpages;
262 if (num_physpages > num_dma_physpages) {
263 zones_size[ZONE_NORMAL] = max_low_pfn - max_dma;
264 zholes_size[ZONE_NORMAL] =
265 ((max_low_pfn - max_dma) -
266 (num_physpages - num_dma_physpages));
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_node(0, NODE_DATA(0), zones_size, 0,
277 unsigned long map_size;
279 /* allocate virtual_mem_map */
281 map_size = PAGE_ALIGN(max_low_pfn * 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);
286 NODE_DATA(0)->node_mem_map = vmem_map;
287 free_area_init_node(0, NODE_DATA(0), zones_size,
290 printk("Virtual mem_map starts at 0x%p\n", mem_map);
292 #else /* !CONFIG_VIRTUAL_MEM_MAP */
293 if (max_low_pfn < max_dma)
294 zones_size[ZONE_DMA] = max_low_pfn;
296 zones_size[ZONE_DMA] = max_dma;
297 zones_size[ZONE_NORMAL] = max_low_pfn - max_dma;
299 free_area_init(zones_size);
300 #endif /* !CONFIG_VIRTUAL_MEM_MAP */
301 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));