[mirror_ubuntu-zesty-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/config.h>
#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(mem_map+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 */

#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
	if (start < end)
		printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
		       (end - start) >> 10);

	for (; start < end; start += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(start));
		init_page_count(virt_to_page(start));
		free_page(start);
		totalram_pages++;
	}
}
#endif

extern unsigned long prom_free_prom_memory(void);

void free_initmem(void)
{
	unsigned long addr, page, freed;

	freed = prom_free_prom_memory();

	addr = (unsigned long) &__init_begin;
	while (addr < (unsigned long) &__init_end) {
#ifdef CONFIG_64BIT
		page = PAGE_OFFSET | CPHYSADDR(addr);
#else
		page = addr;
#endif
		ClearPageReserved(virt_to_page(page));
		init_page_count(virt_to_page(page));
		free_page(page);
		totalram_pages++;
		freed += PAGE_SIZE;
		addr += PAGE_SIZE;
	}
	printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
	       freed >> 10);
}
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	*/
	11	#include <linux/config.h>
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/signal.h>
	15	#include <linux/sched.h>
	16	#include <linux/kernel.h>
	17	#include <linux/errno.h>
	18	#include <linux/string.h>
	19	#include <linux/types.h>
	20	#include <linux/pagemap.h>
	21	#include <linux/ptrace.h>
	22	#include <linux/mman.h>
	23	#include <linux/mm.h>
	24	#include <linux/bootmem.h>
	25	#include <linux/highmem.h>
	26	#include <linux/swap.h>
3d503753	27	#include <linux/proc_fs.h>
22a9835c	28	#include <linux/pfn.h>
1da177e4 LT	29
	30	#include <asm/bootinfo.h>
	31	#include <asm/cachectl.h>
	32	#include <asm/cpu.h>
	33	#include <asm/dma.h>
	34	#include <asm/mmu_context.h>
	35	#include <asm/sections.h>
	36	#include <asm/pgtable.h>
	37	#include <asm/pgalloc.h>
	38	#include <asm/tlb.h>
	39
	40	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	41
	42	unsigned long highstart_pfn, highend_pfn;
	43
	44	/*
	45	* We have up to 8 empty zeroed pages so we can map one of the right colour
	46	* when needed. This is necessary only on R4000 / R4400 SC and MC versions
	47	* where we have to avoid VCED / VECI exceptions for good performance at
	48	* any price. Since page is never written to after the initialization we
	49	* don't have to care about aliases on other CPUs.
	50	*/
	51	unsigned long empty_zero_page, zero_page_mask;
	52
	53	/*
	54	* Not static inline because used by IP27 special magic initialization code
	55	*/
	56	unsigned long setup_zero_pages(void)
	57	{
8dfcc9ba NP	58	unsigned int order;
8dfcc9ba NP	59	unsigned long size;
1da177e4 LT	60	struct page *page;
	61
	62	if (cpu_has_vce)
	63	order = 3;
	64	else
	65	order = 0;
	66
	67	empty_zero_page = __get_free_pages(GFP_KERNEL \| __GFP_ZERO, order);
	68	if (!empty_zero_page)
	69	panic("Oh boy, that early out of memory?");
	70
	71	page = virt_to_page(empty_zero_page);
8dfcc9ba	72	split_page(page, order);
1da177e4	73	while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) {
68352e6e	74	SetPageReserved(page);
1da177e4 LT	75	page++;
	76	}
	77
	78	size = PAGE_SIZE << order;
	79	zero_page_mask = (size - 1) & PAGE_MASK;
	80
	81	return 1UL << order;
	82	}
	83
	84	#ifdef CONFIG_HIGHMEM
	85	pte_t *kmap_pte;
	86	pgprot_t kmap_prot;
	87
	88	#define kmap_get_fixmap_pte(vaddr) \
c6e8b587	89	pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
1da177e4 LT	90
	91	static void __init kmap_init(void)
	92	{
	93	unsigned long kmap_vstart;
	94
	95	/* cache the first kmap pte */
	96	kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
	97	kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
	98
	99	kmap_prot = PAGE_KERNEL;
	100	}
	101
84fd089a RB	102	#ifdef CONFIG_32BIT
84fd089a RB	103	void __init fixrange_init(unsigned long start, unsigned long end,
1da177e4 LT	104	pgd_t *pgd_base)
	105	{
	106	pgd_t *pgd;
c6e8b587	107	pud_t *pud;
1da177e4 LT	108	pmd_t *pmd;
1da177e4 LT	109	pte_t *pte;
c6e8b587	110	int i, j, k;
1da177e4 LT	111	unsigned long vaddr;
	112
	113	vaddr = start;
	114	i = __pgd_offset(vaddr);
c6e8b587 RB	115	j = __pud_offset(vaddr);
c6e8b587 RB	116	k = __pmd_offset(vaddr);
1da177e4 LT	117	pgd = pgd_base + i;
	118
	119	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
c6e8b587 RB	120	pud = (pud_t *)pgd;
	121	for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
	122	pmd = (pmd_t *)pud;
	123	for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
	124	if (pmd_none(*pmd)) {
	125	pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
	126	set_pmd(pmd, __pmd(pte));
	127	if (pte != pte_offset_kernel(pmd, 0))
	128	BUG();
	129	}
	130	vaddr += PMD_SIZE;
1da177e4	131	}
c6e8b587	132	k = 0;
1da177e4 LT	133	}
	134	j = 0;
	135	}
	136	}
dbc57169	137	#endif /* CONFIG_32BIT */
1da177e4 LT	138	#endif /* CONFIG_HIGHMEM */
1da177e4 LT	139
b4819b59	140	#ifndef CONFIG_NEED_MULTIPLE_NODES
1da177e4 LT	141	extern void pagetable_init(void);
	142
	143	void __init paging_init(void)
	144	{
	145	unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
	146	unsigned long max_dma, high, low;
	147
	148	pagetable_init();
	149
	150	#ifdef CONFIG_HIGHMEM
	151	kmap_init();
	152	#endif
	153
	154	max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	155	low = max_low_pfn;
	156	high = highend_pfn;
	157
	158	#ifdef CONFIG_ISA
	159	if (low < max_dma)
	160	zones_size[ZONE_DMA] = low;
	161	else {
	162	zones_size[ZONE_DMA] = max_dma;
	163	zones_size[ZONE_NORMAL] = low - max_dma;
	164	}
	165	#else
	166	zones_size[ZONE_DMA] = low;
	167	#endif
	168	#ifdef CONFIG_HIGHMEM
	169	if (cpu_has_dc_aliases) {
	170	printk(KERN_WARNING "This processor doesn't support highmem.");
	171	if (high - low)
	172	printk(" %ldk highmem ignored", high - low);
	173	printk("\n");
	174	} else
	175	zones_size[ZONE_HIGHMEM] = high - low;
	176	#endif
	177
	178	free_area_init(zones_size);
	179	}
	180
1da177e4 LT	181	static inline int page_is_ram(unsigned long pagenr)
	182	{
	183	int i;
	184
	185	for (i = 0; i < boot_mem_map.nr_map; i++) {
	186	unsigned long addr, end;
	187
	188	if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
	189	/* not usable memory */
	190	continue;
	191
	192	addr = PFN_UP(boot_mem_map.map[i].addr);
	193	end = PFN_DOWN(boot_mem_map.map[i].addr +
	194	boot_mem_map.map[i].size);
	195
	196	if (pagenr >= addr && pagenr < end)
	197	return 1;
	198	}
	199
	200	return 0;
	201	}
	202
3d503753 DJ	203	static struct kcore_list kcore_mem, kcore_vmalloc;
	204	#ifdef CONFIG_64BIT
	205	static struct kcore_list kcore_kseg0;
	206	#endif
	207
1da177e4 LT	208	void __init mem_init(void)
	209	{
	210	unsigned long codesize, reservedpages, datasize, initsize;
	211	unsigned long tmp, ram;
	212
	213	#ifdef CONFIG_HIGHMEM
	214	#ifdef CONFIG_DISCONTIGMEM
	215	#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
	216	#endif
	217	max_mapnr = num_physpages = highend_pfn;
	218	#else
	219	max_mapnr = num_physpages = max_low_pfn;
	220	#endif
	221	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
	222
	223	totalram_pages += free_all_bootmem();
	224	totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
	225
	226	reservedpages = ram = 0;
	227	for (tmp = 0; tmp < max_low_pfn; tmp++)
	228	if (page_is_ram(tmp)) {
	229	ram++;
	230	if (PageReserved(mem_map+tmp))
	231	reservedpages++;
	232	}
	233
	234	#ifdef CONFIG_HIGHMEM
	235	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
	236	struct page *page = mem_map + tmp;
	237
	238	if (!page_is_ram(tmp)) {
	239	SetPageReserved(page);
	240	continue;
	241	}
	242	ClearPageReserved(page);
	243	#ifdef CONFIG_LIMITED_DMA
	244	set_page_address(page, lowmem_page_address(page));
	245	#endif
7835e98b	246	init_page_count(page);
1da177e4 LT	247	__free_page(page);
	248	totalhigh_pages++;
	249	}
	250	totalram_pages += totalhigh_pages;
	251	#endif
	252
	253	codesize = (unsigned long) &_etext - (unsigned long) &_text;
	254	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
	255	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
	256
3d503753 DJ	257	#ifdef CONFIG_64BIT
	258	if ((unsigned long) &_text > (unsigned long) CKSEG0)
	259	/* The -4 is a hack so that user tools don't have to handle
	260	the overflow. */
	261	kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
	262	#endif
	263	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	264	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
	265	VMALLOC_END-VMALLOC_START);
	266
1da177e4 LT	267	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
	268	"%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
	269	(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
	270	ram << (PAGE_SHIFT-10),
	271	codesize >> 10,
	272	reservedpages << (PAGE_SHIFT-10),
	273	datasize >> 10,
	274	initsize >> 10,
	275	(unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
	276	}
b4819b59	277	#endif /* !CONFIG_NEED_MULTIPLE_NODES */
1da177e4 LT	278
	279	#ifdef CONFIG_BLK_DEV_INITRD
	280	void free_initrd_mem(unsigned long start, unsigned long end)
	281	{
875d43e7	282	#ifdef CONFIG_64BIT
1da177e4 LT	283	/* Switch from KSEG0 to XKPHYS addresses */
	284	start = (unsigned long)phys_to_virt(CPHYSADDR(start));
	285	end = (unsigned long)phys_to_virt(CPHYSADDR(end));
	286	#endif
	287	if (start < end)
	288	printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
	289	(end - start) >> 10);
	290
	291	for (; start < end; start += PAGE_SIZE) {
	292	ClearPageReserved(virt_to_page(start));
7835e98b	293	init_page_count(virt_to_page(start));
1da177e4 LT	294	free_page(start);
	295	totalram_pages++;
	296	}
	297	}
	298	#endif
	299
	300	extern unsigned long prom_free_prom_memory(void);
	301
	302	void free_initmem(void)
	303	{
	304	unsigned long addr, page, freed;
	305
	306	freed = prom_free_prom_memory();
	307
	308	addr = (unsigned long) &__init_begin;
	309	while (addr < (unsigned long) &__init_end) {
875d43e7	310	#ifdef CONFIG_64BIT
1da177e4 LT	311	page = PAGE_OFFSET \| CPHYSADDR(addr);
	312	#else
	313	page = addr;
	314	#endif
	315	ClearPageReserved(virt_to_page(page));
7835e98b	316	init_page_count(virt_to_page(page));
1da177e4 LT	317	free_page(page);
	318	totalram_pages++;
	319	freed += PAGE_SIZE;
	320	addr += PAGE_SIZE;
	321	}
	322	printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
	323	freed >> 10);
	324	}