[net-next-2.6.git] / arch / ia64 / mm / contig.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1998-2003 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 *	Stephane Eranian <eranian@hpl.hp.com>
 * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
 *
 * Routines used by ia64 machines with contiguous (or virtually contiguous)
 * memory.
 */
#include <linux/config.h>
#include <linux/bootmem.h>
#include <linux/efi.h>
#include <linux/mm.h>
#include <linux/swap.h>

#include <asm/meminit.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/sections.h>
#include <asm/mca.h>

#ifdef CONFIG_VIRTUAL_MEM_MAP
static unsigned long num_dma_physpages;
#endif

/**
 * show_mem - display a memory statistics summary
 *
 * Just walks the pages in the system and describes where they're allocated.
 */
void
show_mem (void)
{
	int i, total = 0, reserved = 0;
	int shared = 0, cached = 0;

	printk("Mem-info:\n");
	show_free_areas();

	printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
	i = max_mapnr;
	while (i-- > 0) {
		if (!pfn_valid(i))
			continue;
		total++;
		if (PageReserved(mem_map+i))
			reserved++;
		else if (PageSwapCache(mem_map+i))
			cached++;
		else if (page_count(mem_map + i))
			shared += page_count(mem_map + i) - 1;
	}
	printk("%d pages of RAM\n", total);
	printk("%d reserved pages\n", reserved);
	printk("%d pages shared\n", shared);
	printk("%d pages swap cached\n", cached);
	printk("%ld pages in page table cache\n",
		pgtable_quicklist_total_size());
}

/* physical address where the bootmem map is located */
unsigned long bootmap_start;

/**
 * find_max_pfn - adjust the maximum page number callback
 * @start: start of range
 * @end: end of range
 * @arg: address of pointer to global max_pfn variable
 *
 * Passed as a callback function to efi_memmap_walk() to determine the highest
 * available page frame number in the system.
 */
int
find_max_pfn (unsigned long start, unsigned long end, void *arg)
{
	unsigned long *max_pfnp = arg, pfn;

	pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT;
	if (pfn > *max_pfnp)
		*max_pfnp = pfn;
	return 0;
}

/**
 * find_bootmap_location - callback to find a memory area for the bootmap
 * @start: start of region
 * @end: end of region
 * @arg: unused callback data
 *
 * Find a place to put the bootmap and return its starting address in
 * bootmap_start.  This address must be page-aligned.
 */
int
find_bootmap_location (unsigned long start, unsigned long end, void *arg)
{
	unsigned long needed = *(unsigned long *)arg;
	unsigned long range_start, range_end, free_start;
	int i;

#if IGNORE_PFN0
	if (start == PAGE_OFFSET) {
		start += PAGE_SIZE;
		if (start >= end)
			return 0;
	}
#endif

	free_start = PAGE_OFFSET;

	for (i = 0; i < num_rsvd_regions; i++) {
		range_start = max(start, free_start);
		range_end   = min(end, rsvd_region[i].start & PAGE_MASK);

		free_start = PAGE_ALIGN(rsvd_region[i].end);

		if (range_end <= range_start)
			continue; /* skip over empty range */

		if (range_end - range_start >= needed) {
			bootmap_start = __pa(range_start);
			return -1;	/* done */
		}

		/* nothing more available in this segment */
		if (range_end == end)
			return 0;
	}
	return 0;
}

/**
 * find_memory - setup memory map
 *
 * Walk the EFI memory map and find usable memory for the system, taking
 * into account reserved areas.
 */
void
find_memory (void)
{
	unsigned long bootmap_size;

	reserve_memory();

	/* first find highest page frame number */
	max_pfn = 0;
	efi_memmap_walk(find_max_pfn, &max_pfn);

	/* how many bytes to cover all the pages */
	bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;

	/* look for a location to hold the bootmap */
	bootmap_start = ~0UL;
	efi_memmap_walk(find_bootmap_location, &bootmap_size);
	if (bootmap_start == ~0UL)
		panic("Cannot find %ld bytes for bootmap\n", bootmap_size);

	bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn);

	/* Free all available memory, then mark bootmem-map as being in use. */
	efi_memmap_walk(filter_rsvd_memory, free_bootmem);
	reserve_bootmem(bootmap_start, bootmap_size);

	find_initrd();
}

#ifdef CONFIG_SMP
/**
 * per_cpu_init - setup per-cpu variables
 *
 * Allocate and setup per-cpu data areas.
 */
void *
per_cpu_init (void)
{
	void *cpu_data;
	int cpu;

	/*
	 * get_free_pages() cannot be used before cpu_init() done.  BSP
	 * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
	 * get_zeroed_page().
	 */
	if (smp_processor_id() == 0) {
		cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
					   PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
		for (cpu = 0; cpu < NR_CPUS; cpu++) {
			memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
			__per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
			cpu_data += PERCPU_PAGE_SIZE;
			per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
		}
	}
	return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
}
#endif /* CONFIG_SMP */

static int
count_pages (u64 start, u64 end, void *arg)
{
	unsigned long *count = arg;

	*count += (end - start) >> PAGE_SHIFT;
	return 0;
}

#ifdef CONFIG_VIRTUAL_MEM_MAP
static int
count_dma_pages (u64 start, u64 end, void *arg)
{
	unsigned long *count = arg;

	if (start < MAX_DMA_ADDRESS)
		*count += (min(end, MAX_DMA_ADDRESS) - start) >> PAGE_SHIFT;
	return 0;
}
#endif

/*
 * Set up the page tables.
 */

void
paging_init (void)
{
	unsigned long max_dma;
	unsigned long zones_size[MAX_NR_ZONES];
#ifdef CONFIG_VIRTUAL_MEM_MAP
	unsigned long zholes_size[MAX_NR_ZONES];
	unsigned long max_gap;
#endif

	/* initialize mem_map[] */

	memset(zones_size, 0, sizeof(zones_size));

	num_physpages = 0;
	efi_memmap_walk(count_pages, &num_physpages);

	max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;

#ifdef CONFIG_VIRTUAL_MEM_MAP
	memset(zholes_size, 0, sizeof(zholes_size));

	num_dma_physpages = 0;
	efi_memmap_walk(count_dma_pages, &num_dma_physpages);

	if (max_low_pfn < max_dma) {
		zones_size[ZONE_DMA] = max_low_pfn;
		zholes_size[ZONE_DMA] = max_low_pfn - num_dma_physpages;
	} else {
		zones_size[ZONE_DMA] = max_dma;
		zholes_size[ZONE_DMA] = max_dma - num_dma_physpages;
		if (num_physpages > num_dma_physpages) {
			zones_size[ZONE_NORMAL] = max_low_pfn - max_dma;
			zholes_size[ZONE_NORMAL] =
				((max_low_pfn - max_dma) -
				 (num_physpages - num_dma_physpages));
		}
	}

	max_gap = 0;
	efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
	if (max_gap < LARGE_GAP) {
		vmem_map = (struct page *) 0;
		free_area_init_node(0, &contig_page_data, zones_size, 0,
				    zholes_size);
	} else {
		unsigned long map_size;

		/* allocate virtual_mem_map */

		map_size = PAGE_ALIGN(max_low_pfn * sizeof(struct page));
		vmalloc_end -= map_size;
		vmem_map = (struct page *) vmalloc_end;
		efi_memmap_walk(create_mem_map_page_table, NULL);

		NODE_DATA(0)->node_mem_map = vmem_map;
		free_area_init_node(0, &contig_page_data, zones_size,
				    0, zholes_size);

		printk("Virtual mem_map starts at 0x%p\n", mem_map);
	}
#else /* !CONFIG_VIRTUAL_MEM_MAP */
	if (max_low_pfn < max_dma)
		zones_size[ZONE_DMA] = max_low_pfn;
	else {
		zones_size[ZONE_DMA] = max_dma;
		zones_size[ZONE_NORMAL] = max_low_pfn - max_dma;
	}
	free_area_init(zones_size);
#endif /* !CONFIG_VIRTUAL_MEM_MAP */
	zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
}
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	*/
	17	#include <linux/config.h>
	18	#include <linux/bootmem.h>
	19	#include <linux/efi.h>
	20	#include <linux/mm.h>
	21	#include <linux/swap.h>
	22
	23	#include <asm/meminit.h>
	24	#include <asm/pgalloc.h>
	25	#include <asm/pgtable.h>
	26	#include <asm/sections.h>
	27	#include <asm/mca.h>
	28
	29	#ifdef CONFIG_VIRTUAL_MEM_MAP
	30	static unsigned long num_dma_physpages;
	31	#endif
	32
	33	/**
	34	* show_mem - display a memory statistics summary
	35	*
	36	* Just walks the pages in the system and describes where they're allocated.
	37	*/
	38	void
	39	show_mem (void)
	40	{
	41	int i, total = 0, reserved = 0;
	42	int shared = 0, cached = 0;
	43
	44	printk("Mem-info:\n");
	45	show_free_areas();
	46
	47	printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
	48	i = max_mapnr;
	49	while (i-- > 0) {
	50	if (!pfn_valid(i))
	51	continue;
	52	total++;
	53	if (PageReserved(mem_map+i))
	54	reserved++;
	55	else if (PageSwapCache(mem_map+i))
	56	cached++;
	57	else if (page_count(mem_map + i))
	58	shared += page_count(mem_map + i) - 1;
	59	}
	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);
fde740e4 RH	64	printk("%ld pages in page table cache\n",
fde740e4 RH	65	pgtable_quicklist_total_size());
1da177e4 LT	66	}
	67
	68	/* physical address where the bootmem map is located */
	69	unsigned long bootmap_start;
	70
	71	/**
	72	* find_max_pfn - adjust the maximum page number callback
	73	* @start: start of range
	74	* @end: end of range
	75	* @arg: address of pointer to global max_pfn variable
	76	*
	77	* Passed as a callback function to efi_memmap_walk() to determine the highest
	78	* available page frame number in the system.
	79	*/
	80	int
	81	find_max_pfn (unsigned long start, unsigned long end, void *arg)
	82	{
	83	unsigned long *max_pfnp = arg, pfn;
	84
	85	pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT;
	86	if (pfn > *max_pfnp)
	87	*max_pfnp = pfn;
	88	return 0;
	89	}
	90
	91	/**
	92	* find_bootmap_location - callback to find a memory area for the bootmap
	93	* @start: start of region
	94	* @end: end of region
	95	* @arg: unused callback data
	96	*
	97	* Find a place to put the bootmap and return its starting address in
	98	* bootmap_start. This address must be page-aligned.
	99	*/
	100	int
	101	find_bootmap_location (unsigned long start, unsigned long end, void *arg)
	102	{
	103	unsigned long needed = (unsigned long )arg;
	104	unsigned long range_start, range_end, free_start;
	105	int i;
	106
	107	#if IGNORE_PFN0
	108	if (start == PAGE_OFFSET) {
	109	start += PAGE_SIZE;
	110	if (start >= end)
	111	return 0;
	112	}
	113	#endif
	114
	115	free_start = PAGE_OFFSET;
	116
	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);
	120
	121	free_start = PAGE_ALIGN(rsvd_region[i].end);
	122
	123	if (range_end <= range_start)
	124	continue; /* skip over empty range */
	125
	126	if (range_end - range_start >= needed) {
	127	bootmap_start = __pa(range_start);
	128	return -1; /* done */
	129	}
130
131	/* nothing more available in this segment */
132	if (range_end == end)
133	return 0;
134	}
135	return 0;
136	}
137
138	/**
139	* find_memory - setup memory map
140	*
141	* Walk the EFI memory map and find usable memory for the system, taking
142	* into account reserved areas.
143	*/
144	void
145	find_memory (void)
146	{
147	unsigned long bootmap_size;
148
149	reserve_memory();
150
151	/* first find highest page frame number */
152	max_pfn = 0;
153	efi_memmap_walk(find_max_pfn, &max_pfn);
154
155	/* how many bytes to cover all the pages */
156	bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
157
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);
163
164	bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn);
165
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);
169
170	find_initrd();
171	}
172
173	#ifdef CONFIG_SMP
174	/**
175	* per_cpu_init - setup per-cpu variables
176	*
177	* Allocate and setup per-cpu data areas.
178	*/
179	void *
180	per_cpu_init (void)
181	{
182	void *cpu_data;
183	int cpu;
184
185	/*
186	* get_free_pages() cannot be used before cpu_init() done. BSP
187	* allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
188	* get_zeroed_page().
189	*/
190	if (smp_processor_id() == 0) {
191	cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
192	PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
193	for (cpu = 0; cpu < NR_CPUS; cpu++) {
194	memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
195	__per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
196	cpu_data += PERCPU_PAGE_SIZE;
197	per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
198	}
199	}
200	return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
201	}
202	#endif /* CONFIG_SMP */
203
204	static int
205	count_pages (u64 start, u64 end, void *arg)
206	{
207	unsigned long *count = arg;
208
209	*count += (end - start) >> PAGE_SHIFT;
210	return 0;
211	}
212
213	#ifdef CONFIG_VIRTUAL_MEM_MAP
214	static int
215	count_dma_pages (u64 start, u64 end, void *arg)
216	{
217	unsigned long *count = arg;
218
219	if (start < MAX_DMA_ADDRESS)
220	*count += (min(end, MAX_DMA_ADDRESS) - start) >> PAGE_SHIFT;
221	return 0;
222	}
223	#endif
224
225	/*
226	* Set up the page tables.
227	*/
228
229	void
230	paging_init (void)
231	{
232	unsigned long max_dma;
233	unsigned long zones_size[MAX_NR_ZONES];
234	#ifdef CONFIG_VIRTUAL_MEM_MAP
235	unsigned long zholes_size[MAX_NR_ZONES];
236	unsigned long max_gap;
237	#endif
238
239	/* initialize mem_map[] */
240
241	memset(zones_size, 0, sizeof(zones_size));
242
243	num_physpages = 0;
244	efi_memmap_walk(count_pages, &num_physpages);
245
246	max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
247
248	#ifdef CONFIG_VIRTUAL_MEM_MAP
249	memset(zholes_size, 0, sizeof(zholes_size));
250
251	num_dma_physpages = 0;
252	efi_memmap_walk(count_dma_pages, &num_dma_physpages);
253
254	if (max_low_pfn < max_dma) {
255	zones_size[ZONE_DMA] = max_low_pfn;
256	zholes_size[ZONE_DMA] = max_low_pfn - num_dma_physpages;
257	} else {
258	zones_size[ZONE_DMA] = max_dma;
259	zholes_size[ZONE_DMA] = max_dma - num_dma_physpages;
260	if (num_physpages > num_dma_physpages) {
261	zones_size[ZONE_NORMAL] = max_low_pfn - max_dma;
262	zholes_size[ZONE_NORMAL] =
263	((max_low_pfn - max_dma) -
264	(num_physpages - num_dma_physpages));
265	}
266	}
267
268	max_gap = 0;
269	efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
270	if (max_gap < LARGE_GAP) {
271	vmem_map = (struct page *) 0;
272	free_area_init_node(0, &contig_page_data, zones_size, 0,
273	zholes_size);
274	} else {
275	unsigned long map_size;
276
277	/* allocate virtual_mem_map */
278
279	map_size = PAGE_ALIGN(max_low_pfn * sizeof(struct page));
280	vmalloc_end -= map_size;
281	vmem_map = (struct page *) vmalloc_end;
282	efi_memmap_walk(create_mem_map_page_table, NULL);
283
284	NODE_DATA(0)->node_mem_map = vmem_map;
285	free_area_init_node(0, &contig_page_data, zones_size,
286	0, zholes_size);
287
288	printk("Virtual mem_map starts at 0x%p\n", mem_map);
289	}
290	#else /* !CONFIG_VIRTUAL_MEM_MAP */
291	if (max_low_pfn < max_dma)
292	zones_size[ZONE_DMA] = max_low_pfn;
293	else {
294	zones_size[ZONE_DMA] = max_dma;
295	zones_size[ZONE_NORMAL] = max_low_pfn - max_dma;
296	}
297	free_area_init(zones_size);
298	#endif /* !CONFIG_VIRTUAL_MEM_MAP */
299	zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
300	}