[mirror_ubuntu-artful-kernel.git] / arch / mips / mm / init.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) 1994 - 2000 Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/pagemap.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/proc_fs.h>
#include <linux/pfn.h>

#include <asm/bootinfo.h>
#include <asm/cachectl.h>
#include <asm/cpu.h>
#include <asm/dma.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

unsigned long highstart_pfn, highend_pfn;

/*
 * We have up to 8 empty zeroed pages so we can map one of the right colour
 * when needed.  This is necessary only on R4000 / R4400 SC and MC versions
 * where we have to avoid VCED / VECI exceptions for good performance at
 * any price.  Since page is never written to after the initialization we
 * don't have to care about aliases on other CPUs.
 */
unsigned long empty_zero_page, zero_page_mask;

/*
 * Not static inline because used by IP27 special magic initialization code
 */
unsigned long setup_zero_pages(void)
{
	unsigned int order;
	unsigned long size;
	struct page *page;

	if (cpu_has_vce)
		order = 3;
	else
		order = 0;

	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
	if (!empty_zero_page)
		panic("Oh boy, that early out of memory?");

	page = virt_to_page(empty_zero_page);
	split_page(page, order);
	while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) {
		SetPageReserved(page);
		page++;
	}

	size = PAGE_SIZE << order;
	zero_page_mask = (size - 1) & PAGE_MASK;

	return 1UL << order;
}

#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
pgprot_t kmap_prot;

#define kmap_get_fixmap_pte(vaddr)					\
	pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))

static void __init kmap_init(void)
{
	unsigned long kmap_vstart;

	/* cache the first kmap pte */
	kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
	kmap_pte = kmap_get_fixmap_pte(kmap_vstart);

	kmap_prot = PAGE_KERNEL;
}

#ifdef CONFIG_32BIT
void __init fixrange_init(unsigned long start, unsigned long end,
	pgd_t *pgd_base)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;
	int i, j, k;
	unsigned long vaddr;

	vaddr = start;
	i = __pgd_offset(vaddr);
	j = __pud_offset(vaddr);
	k = __pmd_offset(vaddr);
	pgd = pgd_base + i;

	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
		pud = (pud_t *)pgd;
		for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
			pmd = (pmd_t *)pud;
			for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
				if (pmd_none(*pmd)) {
					pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
					set_pmd(pmd, __pmd(pte));
					if (pte != pte_offset_kernel(pmd, 0))
						BUG();
				}
				vaddr += PMD_SIZE;
			}
			k = 0;
		}
		j = 0;
	}
}
#endif /* CONFIG_32BIT */
#endif /* CONFIG_HIGHMEM */

#ifndef CONFIG_NEED_MULTIPLE_NODES
extern void pagetable_init(void);

void __init paging_init(void)
{
	unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
	unsigned long max_dma, high, low;

	pagetable_init();

#ifdef CONFIG_HIGHMEM
	kmap_init();
#endif

	max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	low = max_low_pfn;
	high = highend_pfn;

#ifdef CONFIG_ISA
	if (low < max_dma)
		zones_size[ZONE_DMA] = low;
	else {
		zones_size[ZONE_DMA] = max_dma;
		zones_size[ZONE_NORMAL] = low - max_dma;
	}
#else
	zones_size[ZONE_DMA] = low;
#endif
#ifdef CONFIG_HIGHMEM
	if (cpu_has_dc_aliases) {
		printk(KERN_WARNING "This processor doesn't support highmem.");
		if (high - low)
			printk(" %ldk highmem ignored", high - low);
		printk("\n");
	} else
		zones_size[ZONE_HIGHMEM] = high - low;
#endif

	free_area_init(zones_size);
}

static inline int page_is_ram(unsigned long pagenr)
{
	int i;

	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long addr, end;

		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
			/* not usable memory */
			continue;

		addr = PFN_UP(boot_mem_map.map[i].addr);
		end = PFN_DOWN(boot_mem_map.map[i].addr +
			       boot_mem_map.map[i].size);

		if (pagenr >= addr && pagenr < end)
			return 1;
	}

	return 0;
}

static struct kcore_list kcore_mem, kcore_vmalloc;
#ifdef CONFIG_64BIT
static struct kcore_list kcore_kseg0;
#endif

void __init mem_init(void)
{
	unsigned long codesize, reservedpages, datasize, initsize;
	unsigned long tmp, ram;

#ifdef CONFIG_HIGHMEM
#ifdef CONFIG_DISCONTIGMEM
#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
#endif
	max_mapnr = num_physpages = highend_pfn;
#else
	max_mapnr = num_physpages = max_low_pfn;
#endif
	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);

	totalram_pages += free_all_bootmem();
	totalram_pages -= setup_zero_pages();	/* Setup zeroed pages.  */

	reservedpages = ram = 0;
	for (tmp = 0; tmp < max_low_pfn; tmp++)
		if (page_is_ram(tmp)) {
			ram++;
			if (PageReserved(pfn_to_page(tmp)))
				reservedpages++;
		}

#ifdef CONFIG_HIGHMEM
	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
		struct page *page = mem_map + tmp;

		if (!page_is_ram(tmp)) {
			SetPageReserved(page);
			continue;
		}
		ClearPageReserved(page);
#ifdef CONFIG_LIMITED_DMA
		set_page_address(page, lowmem_page_address(page));
#endif
		init_page_count(page);
		__free_page(page);
		totalhigh_pages++;
	}
	totalram_pages += totalhigh_pages;
#endif

	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;

#ifdef CONFIG_64BIT
	if ((unsigned long) &_text > (unsigned long) CKSEG0)
		/* The -4 is a hack so that user tools don't have to handle
		   the overflow.  */
		kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
#endif
	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
		   VMALLOC_END-VMALLOC_START);

	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
	       "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
	       (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
	       ram << (PAGE_SHIFT-10),
	       codesize >> 10,
	       reservedpages << (PAGE_SHIFT-10),
	       datasize >> 10,
	       initsize >> 10,
	       (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
}
#endif /* !CONFIG_NEED_MULTIPLE_NODES */

void free_init_pages(char *what, unsigned long begin, unsigned long end)
{
	unsigned long addr;

	for (addr = begin; addr < end; addr += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(addr));
		init_page_count(virt_to_page(addr));
		memset((void *)addr, 0xcc, PAGE_SIZE);
		free_page(addr);
		totalram_pages++;
	}
	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
#ifdef CONFIG_64BIT
	/* Switch from KSEG0 to XKPHYS addresses */
	start = (unsigned long)phys_to_virt(CPHYSADDR(start));
	end = (unsigned long)phys_to_virt(CPHYSADDR(end));
#endif
	free_init_pages("initrd memory", start, end);
}
#endif

extern unsigned long prom_free_prom_memory(void);

void free_initmem(void)
{
	unsigned long start, end, freed;

	freed = prom_free_prom_memory();
	if (freed)
		printk(KERN_INFO "Freeing firmware memory: %ldk freed\n",freed);

	start = (unsigned long)(&__init_begin);
	end = (unsigned long)(&__init_end);
#ifdef CONFIG_64BIT
	start = PAGE_OFFSET | CPHYSADDR(start);
	end = PAGE_OFFSET | CPHYSADDR(end);
#endif
	free_init_pages("unused kernel memory", start, end);
}
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) 1994 - 2000 Ralf Baechle
	7	* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
	8	* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
	9	* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
	10	*/
1da177e4 LT	11	#include <linux/init.h>
	12	#include <linux/module.h>
	13	#include <linux/signal.h>
	14	#include <linux/sched.h>
	15	#include <linux/kernel.h>
	16	#include <linux/errno.h>
	17	#include <linux/string.h>
	18	#include <linux/types.h>
	19	#include <linux/pagemap.h>
	20	#include <linux/ptrace.h>
	21	#include <linux/mman.h>
	22	#include <linux/mm.h>
	23	#include <linux/bootmem.h>
	24	#include <linux/highmem.h>
	25	#include <linux/swap.h>
3d503753	26	#include <linux/proc_fs.h>
22a9835c	27	#include <linux/pfn.h>
1da177e4 LT	28
	29	#include <asm/bootinfo.h>
	30	#include <asm/cachectl.h>
	31	#include <asm/cpu.h>
	32	#include <asm/dma.h>
	33	#include <asm/mmu_context.h>
	34	#include <asm/sections.h>
	35	#include <asm/pgtable.h>
	36	#include <asm/pgalloc.h>
	37	#include <asm/tlb.h>
	38
	39	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	40
	41	unsigned long highstart_pfn, highend_pfn;
	42
	43	/*
	44	* We have up to 8 empty zeroed pages so we can map one of the right colour
	45	* when needed. This is necessary only on R4000 / R4400 SC and MC versions
	46	* where we have to avoid VCED / VECI exceptions for good performance at
	47	* any price. Since page is never written to after the initialization we
	48	* don't have to care about aliases on other CPUs.
	49	*/
	50	unsigned long empty_zero_page, zero_page_mask;
	51
	52	/*
	53	* Not static inline because used by IP27 special magic initialization code
	54	*/
	55	unsigned long setup_zero_pages(void)
	56	{
8dfcc9ba NP	57	unsigned int order;
8dfcc9ba NP	58	unsigned long size;
1da177e4 LT	59	struct page *page;
	60
	61	if (cpu_has_vce)
	62	order = 3;
	63	else
	64	order = 0;
	65
	66	empty_zero_page = __get_free_pages(GFP_KERNEL \| __GFP_ZERO, order);
	67	if (!empty_zero_page)
	68	panic("Oh boy, that early out of memory?");
	69
	70	page = virt_to_page(empty_zero_page);
8dfcc9ba	71	split_page(page, order);
1da177e4	72	while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) {
68352e6e	73	SetPageReserved(page);
1da177e4 LT	74	page++;
	75	}
	76
	77	size = PAGE_SIZE << order;
	78	zero_page_mask = (size - 1) & PAGE_MASK;
	79
	80	return 1UL << order;
	81	}
	82
	83	#ifdef CONFIG_HIGHMEM
	84	pte_t *kmap_pte;
	85	pgprot_t kmap_prot;
	86
	87	#define kmap_get_fixmap_pte(vaddr) \
c6e8b587	88	pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
1da177e4 LT	89
	90	static void __init kmap_init(void)
	91	{
	92	unsigned long kmap_vstart;
	93
	94	/* cache the first kmap pte */
	95	kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
	96	kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
	97
	98	kmap_prot = PAGE_KERNEL;
	99	}
	100
84fd089a RB	101	#ifdef CONFIG_32BIT
84fd089a RB	102	void __init fixrange_init(unsigned long start, unsigned long end,
1da177e4 LT	103	pgd_t *pgd_base)
	104	{
	105	pgd_t *pgd;
c6e8b587	106	pud_t *pud;
1da177e4 LT	107	pmd_t *pmd;
1da177e4 LT	108	pte_t *pte;
c6e8b587	109	int i, j, k;
1da177e4 LT	110	unsigned long vaddr;
	111
	112	vaddr = start;
	113	i = __pgd_offset(vaddr);
c6e8b587 RB	114	j = __pud_offset(vaddr);
c6e8b587 RB	115	k = __pmd_offset(vaddr);
1da177e4 LT	116	pgd = pgd_base + i;
	117
	118	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
c6e8b587 RB	119	pud = (pud_t *)pgd;
	120	for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
	121	pmd = (pmd_t *)pud;
	122	for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
	123	if (pmd_none(*pmd)) {
	124	pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
	125	set_pmd(pmd, __pmd(pte));
	126	if (pte != pte_offset_kernel(pmd, 0))
	127	BUG();
	128	}
	129	vaddr += PMD_SIZE;
1da177e4	130	}
c6e8b587	131	k = 0;
1da177e4 LT	132	}
	133	j = 0;
	134	}
	135	}
dbc57169	136	#endif /* CONFIG_32BIT */
1da177e4 LT	137	#endif /* CONFIG_HIGHMEM */
1da177e4 LT	138
b4819b59	139	#ifndef CONFIG_NEED_MULTIPLE_NODES
1da177e4 LT	140	extern void pagetable_init(void);
	141
	142	void __init paging_init(void)
	143	{
	144	unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
	145	unsigned long max_dma, high, low;
	146
	147	pagetable_init();
	148
	149	#ifdef CONFIG_HIGHMEM
	150	kmap_init();
	151	#endif
	152
	153	max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	154	low = max_low_pfn;
	155	high = highend_pfn;
	156
	157	#ifdef CONFIG_ISA
	158	if (low < max_dma)
	159	zones_size[ZONE_DMA] = low;
	160	else {
	161	zones_size[ZONE_DMA] = max_dma;
	162	zones_size[ZONE_NORMAL] = low - max_dma;
	163	}
	164	#else
	165	zones_size[ZONE_DMA] = low;
	166	#endif
	167	#ifdef CONFIG_HIGHMEM
	168	if (cpu_has_dc_aliases) {
	169	printk(KERN_WARNING "This processor doesn't support highmem.");
	170	if (high - low)
	171	printk(" %ldk highmem ignored", high - low);
	172	printk("\n");
	173	} else
	174	zones_size[ZONE_HIGHMEM] = high - low;
	175	#endif
	176
	177	free_area_init(zones_size);
	178	}
	179
1da177e4 LT	180	static inline int page_is_ram(unsigned long pagenr)
	181	{
	182	int i;
	183
	184	for (i = 0; i < boot_mem_map.nr_map; i++) {
	185	unsigned long addr, end;
	186
	187	if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
	188	/* not usable memory */
	189	continue;
	190
	191	addr = PFN_UP(boot_mem_map.map[i].addr);
	192	end = PFN_DOWN(boot_mem_map.map[i].addr +
	193	boot_mem_map.map[i].size);
	194
	195	if (pagenr >= addr && pagenr < end)
	196	return 1;
	197	}
	198
	199	return 0;
	200	}
	201
3d503753 DJ	202	static struct kcore_list kcore_mem, kcore_vmalloc;
	203	#ifdef CONFIG_64BIT
	204	static struct kcore_list kcore_kseg0;
	205	#endif
	206
1da177e4 LT	207	void __init mem_init(void)
	208	{
	209	unsigned long codesize, reservedpages, datasize, initsize;
	210	unsigned long tmp, ram;
	211
	212	#ifdef CONFIG_HIGHMEM
	213	#ifdef CONFIG_DISCONTIGMEM
	214	#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
	215	#endif
	216	max_mapnr = num_physpages = highend_pfn;
	217	#else
	218	max_mapnr = num_physpages = max_low_pfn;
	219	#endif
	220	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
	221
	222	totalram_pages += free_all_bootmem();
	223	totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
	224
	225	reservedpages = ram = 0;
	226	for (tmp = 0; tmp < max_low_pfn; tmp++)
	227	if (page_is_ram(tmp)) {
	228	ram++;
b1c231f5	229	if (PageReserved(pfn_to_page(tmp)))
1da177e4 LT	230	reservedpages++;
	231	}
	232
	233	#ifdef CONFIG_HIGHMEM
	234	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
	235	struct page *page = mem_map + tmp;
	236
	237	if (!page_is_ram(tmp)) {
	238	SetPageReserved(page);
	239	continue;
	240	}
	241	ClearPageReserved(page);
	242	#ifdef CONFIG_LIMITED_DMA
	243	set_page_address(page, lowmem_page_address(page));
	244	#endif
7835e98b	245	init_page_count(page);
1da177e4 LT	246	__free_page(page);
	247	totalhigh_pages++;
	248	}
	249	totalram_pages += totalhigh_pages;
	250	#endif
	251
	252	codesize = (unsigned long) &_etext - (unsigned long) &_text;
	253	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
	254	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
	255
3d503753 DJ	256	#ifdef CONFIG_64BIT
	257	if ((unsigned long) &_text > (unsigned long) CKSEG0)
	258	/* The -4 is a hack so that user tools don't have to handle
	259	the overflow. */
	260	kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
	261	#endif
	262	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	263	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
	264	VMALLOC_END-VMALLOC_START);
	265
1da177e4 LT	266	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
	267	"%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
	268	(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
	269	ram << (PAGE_SHIFT-10),
	270	codesize >> 10,
	271	reservedpages << (PAGE_SHIFT-10),
	272	datasize >> 10,
	273	initsize >> 10,
	274	(unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
	275	}
b4819b59	276	#endif /* !CONFIG_NEED_MULTIPLE_NODES */
1da177e4	277
6fd11a21 RB	278	void free_init_pages(char *what, unsigned long begin, unsigned long end)
	279	{
	280	unsigned long addr;
	281
	282	for (addr = begin; addr < end; addr += PAGE_SIZE) {
	283	ClearPageReserved(virt_to_page(addr));
	284	init_page_count(virt_to_page(addr));
	285	memset((void *)addr, 0xcc, PAGE_SIZE);
	286	free_page(addr);
	287	totalram_pages++;
	288	}
	289	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	290	}
	291
1da177e4 LT	292	#ifdef CONFIG_BLK_DEV_INITRD
	293	void free_initrd_mem(unsigned long start, unsigned long end)
	294	{
875d43e7	295	#ifdef CONFIG_64BIT
1da177e4 LT	296	/* Switch from KSEG0 to XKPHYS addresses */
	297	start = (unsigned long)phys_to_virt(CPHYSADDR(start));
	298	end = (unsigned long)phys_to_virt(CPHYSADDR(end));
	299	#endif
6fd11a21	300	free_init_pages("initrd memory", start, end);
1da177e4 LT	301	}
	302	#endif
	303
	304	extern unsigned long prom_free_prom_memory(void);
	305
	306	void free_initmem(void)
	307	{
6fd11a21	308	unsigned long start, end, freed;
1da177e4 LT	309
1da177e4 LT	310	freed = prom_free_prom_memory();
6fd11a21 RB	311	if (freed)
6fd11a21 RB	312	printk(KERN_INFO "Freeing firmware memory: %ldk freed\n",freed);
1da177e4	313
6fd11a21 RB	314	start = (unsigned long)(&__init_begin);
6fd11a21 RB	315	end = (unsigned long)(&__init_end);
875d43e7	316	#ifdef CONFIG_64BIT
6fd11a21 RB	317	start = PAGE_OFFSET \| CPHYSADDR(start);
6fd11a21 RB	318	end = PAGE_OFFSET \| CPHYSADDR(end);
1da177e4	319	#endif
6fd11a21	320	free_init_pages("unused kernel memory", start, end);
1da177e4	321	}