[deliverable/linux.git] / arch / arm / mm / dump.c

/*
 * Debug helper to dump the current kernel pagetables of the system
 * so that we can see what the various memory ranges are set to.
 *
 * Derived from x86 implementation:
 * (C) Copyright 2008 Intel Corporation
 *
 * Author: Arjan van de Ven <arjan@linux.intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License.
 */
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/seq_file.h>

#include <asm/fixmap.h>
#include <asm/pgtable.h>

struct addr_marker {
	unsigned long start_address;
	const char *name;
};

static struct addr_marker address_markers[] = {
	{ MODULES_VADDR,	"Modules" },
	{ PAGE_OFFSET,		"Kernel Mapping" },
	{ 0,			"vmalloc() Area" },
	{ VMALLOC_END,		"vmalloc() End" },
	{ FIXADDR_START,	"Fixmap Area" },
	{ CONFIG_VECTORS_BASE,	"Vectors" },
	{ CONFIG_VECTORS_BASE + PAGE_SIZE * 2, "Vectors End" },
	{ -1,			NULL },
};

struct pg_state {
	struct seq_file *seq;
	const struct addr_marker *marker;
	unsigned long start_address;
	unsigned level;
	u64 current_prot;
};

struct prot_bits {
	u64		mask;
	u64		val;
	const char	*set;
	const char	*clear;
};

static const struct prot_bits pte_bits[] = {
	{
		.mask	= L_PTE_USER,
		.val	= L_PTE_USER,
		.set	= "USR",
		.clear	= "   ",
	}, {
		.mask	= L_PTE_RDONLY,
		.val	= L_PTE_RDONLY,
		.set	= "ro",
		.clear	= "RW",
	}, {
		.mask	= L_PTE_XN,
		.val	= L_PTE_XN,
		.set	= "NX",
		.clear	= "x ",
	}, {
		.mask	= L_PTE_SHARED,
		.val	= L_PTE_SHARED,
		.set	= "SHD",
		.clear	= "   ",
	}, {
		.mask	= L_PTE_MT_MASK,
		.val	= L_PTE_MT_UNCACHED,
		.set	= "SO/UNCACHED",
	}, {
		.mask	= L_PTE_MT_MASK,
		.val	= L_PTE_MT_BUFFERABLE,
		.set	= "MEM/BUFFERABLE/WC",
	}, {
		.mask	= L_PTE_MT_MASK,
		.val	= L_PTE_MT_WRITETHROUGH,
		.set	= "MEM/CACHED/WT",
	}, {
		.mask	= L_PTE_MT_MASK,
		.val	= L_PTE_MT_WRITEBACK,
		.set	= "MEM/CACHED/WBRA",
#ifndef CONFIG_ARM_LPAE
	}, {
		.mask	= L_PTE_MT_MASK,
		.val	= L_PTE_MT_MINICACHE,
		.set	= "MEM/MINICACHE",
#endif
	}, {
		.mask	= L_PTE_MT_MASK,
		.val	= L_PTE_MT_WRITEALLOC,
		.set	= "MEM/CACHED/WBWA",
	}, {
		.mask	= L_PTE_MT_MASK,
		.val	= L_PTE_MT_DEV_SHARED,
		.set	= "DEV/SHARED",
#ifndef CONFIG_ARM_LPAE
	}, {
		.mask	= L_PTE_MT_MASK,
		.val	= L_PTE_MT_DEV_NONSHARED,
		.set	= "DEV/NONSHARED",
#endif
	}, {
		.mask	= L_PTE_MT_MASK,
		.val	= L_PTE_MT_DEV_WC,
		.set	= "DEV/WC",
	}, {
		.mask	= L_PTE_MT_MASK,
		.val	= L_PTE_MT_DEV_CACHED,
		.set	= "DEV/CACHED",
	},
};

static const struct prot_bits section_bits[] = {
#ifdef CONFIG_ARM_LPAE
	{
		.mask	= PMD_SECT_USER,
		.val	= PMD_SECT_USER,
		.set	= "USR",
	}, {
		.mask	= L_PMD_SECT_RDONLY,
		.val	= L_PMD_SECT_RDONLY,
		.set	= "ro",
		.clear	= "RW",
#elif __LINUX_ARM_ARCH__ >= 6
	{
		.mask	= PMD_SECT_APX | PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
		.val	= PMD_SECT_APX | PMD_SECT_AP_WRITE,
		.set	= "    ro",
	}, {
		.mask	= PMD_SECT_APX | PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
		.val	= PMD_SECT_AP_WRITE,
		.set	= "    RW",
	}, {
		.mask	= PMD_SECT_APX | PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
		.val	= PMD_SECT_AP_READ,
		.set	= "USR ro",
	}, {
		.mask	= PMD_SECT_APX | PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
		.val	= PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
		.set	= "USR RW",
#else /* ARMv4/ARMv5  */
	/* These are approximate */
	{
		.mask   = PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
		.val    = 0,
		.set    = "    ro",
	}, {
		.mask   = PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
		.val    = PMD_SECT_AP_WRITE,
		.set    = "    RW",
	}, {
		.mask   = PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
		.val    = PMD_SECT_AP_READ,
		.set    = "USR ro",
	}, {
		.mask   = PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
		.val    = PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
		.set    = "USR RW",
#endif
	}, {
		.mask	= PMD_SECT_XN,
		.val	= PMD_SECT_XN,
		.set	= "NX",
		.clear	= "x ",
	}, {
		.mask	= PMD_SECT_S,
		.val	= PMD_SECT_S,
		.set	= "SHD",
		.clear	= "   ",
	},
};

struct pg_level {
	const struct prot_bits *bits;
	size_t num;
	u64 mask;
};

static struct pg_level pg_level[] = {
	{
	}, { /* pgd */
	}, { /* pud */
	}, { /* pmd */
		.bits	= section_bits,
		.num	= ARRAY_SIZE(section_bits),
	}, { /* pte */
		.bits	= pte_bits,
		.num	= ARRAY_SIZE(pte_bits),
	},
};

static void dump_prot(struct pg_state *st, const struct prot_bits *bits, size_t num)
{
	unsigned i;

	for (i = 0; i < num; i++, bits++) {
		const char *s;

		if ((st->current_prot & bits->mask) == bits->val)
			s = bits->set;
		else
			s = bits->clear;

		if (s)
			seq_printf(st->seq, " %s", s);
	}
}

static void note_page(struct pg_state *st, unsigned long addr, unsigned level, u64 val)
{
	static const char units[] = "KMGTPE";
	u64 prot = val & pg_level[level].mask;

	if (addr < USER_PGTABLES_CEILING)
		return;

	if (!st->level) {
		st->level = level;
		st->current_prot = prot;
		seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	} else if (prot != st->current_prot || level != st->level ||
		   addr >= st->marker[1].start_address) {
		const char *unit = units;
		unsigned long delta;

		if (st->current_prot) {
			seq_printf(st->seq, "0x%08lx-0x%08lx   ",
				   st->start_address, addr);

			delta = (addr - st->start_address) >> 10;
			while (!(delta & 1023) && unit[1]) {
				delta >>= 10;
				unit++;
			}
			seq_printf(st->seq, "%9lu%c", delta, *unit);
			if (pg_level[st->level].bits)
				dump_prot(st, pg_level[st->level].bits, pg_level[st->level].num);
			seq_printf(st->seq, "\n");
		}

		if (addr >= st->marker[1].start_address) {
			st->marker++;
			seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
		}
		st->start_address = addr;
		st->current_prot = prot;
		st->level = level;
	}
}

static void walk_pte(struct pg_state *st, pmd_t *pmd, unsigned long start)
{
	pte_t *pte = pte_offset_kernel(pmd, 0);
	unsigned long addr;
	unsigned i;

	for (i = 0; i < PTRS_PER_PTE; i++, pte++) {
		addr = start + i * PAGE_SIZE;
		note_page(st, addr, 4, pte_val(*pte));
	}
}

static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
{
	pmd_t *pmd = pmd_offset(pud, 0);
	unsigned long addr;
	unsigned i;

	for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
		addr = start + i * PMD_SIZE;
		if (pmd_none(*pmd) || pmd_large(*pmd) || !pmd_present(*pmd))
			note_page(st, addr, 3, pmd_val(*pmd));
		else
			walk_pte(st, pmd, addr);

		if (SECTION_SIZE < PMD_SIZE && pmd_large(pmd[1]))
			note_page(st, addr + SECTION_SIZE, 3, pmd_val(pmd[1]));
	}
}

static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
{
	pud_t *pud = pud_offset(pgd, 0);
	unsigned long addr;
	unsigned i;

	for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
		addr = start + i * PUD_SIZE;
		if (!pud_none(*pud)) {
			walk_pmd(st, pud, addr);
		} else {
			note_page(st, addr, 2, pud_val(*pud));
		}
	}
}

static void walk_pgd(struct seq_file *m)
{
	pgd_t *pgd = swapper_pg_dir;
	struct pg_state st;
	unsigned long addr;
	unsigned i, pgdoff = USER_PGTABLES_CEILING / PGDIR_SIZE;

	memset(&st, 0, sizeof(st));
	st.seq = m;
	st.marker = address_markers;

	pgd += pgdoff;

	for (i = pgdoff; i < PTRS_PER_PGD; i++, pgd++) {
		addr = i * PGDIR_SIZE;
		if (!pgd_none(*pgd)) {
			walk_pud(&st, pgd, addr);
		} else {
			note_page(&st, addr, 1, pgd_val(*pgd));
		}
	}

	note_page(&st, 0, 0, 0);
}

static int ptdump_show(struct seq_file *m, void *v)
{
	walk_pgd(m);
	return 0;
}

static int ptdump_open(struct inode *inode, struct file *file)
{
	return single_open(file, ptdump_show, NULL);
}

static const struct file_operations ptdump_fops = {
	.open		= ptdump_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int ptdump_init(void)
{
	struct dentry *pe;
	unsigned i, j;

	for (i = 0; i < ARRAY_SIZE(pg_level); i++)
		if (pg_level[i].bits)
			for (j = 0; j < pg_level[i].num; j++)
				pg_level[i].mask |= pg_level[i].bits[j].mask;

	address_markers[2].start_address = VMALLOC_START;

	pe = debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
				 &ptdump_fops);
	return pe ? 0 : -ENOMEM;
}
__initcall(ptdump_init);
Commit	Line	Data
1fd15b87 RK	1	/*
	2	* Debug helper to dump the current kernel pagetables of the system
	3	* so that we can see what the various memory ranges are set to.
	4	*
	5	* Derived from x86 implementation:
	6	* (C) Copyright 2008 Intel Corporation
	7	*
	8	* Author: Arjan van de Ven <arjan@linux.intel.com>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; version 2
	13	* of the License.
	14	*/
	15	#include <linux/debugfs.h>
	16	#include <linux/fs.h>
	17	#include <linux/mm.h>
	18	#include <linux/seq_file.h>
	19
	20	#include <asm/fixmap.h>
	21	#include <asm/pgtable.h>
	22
	23	struct addr_marker {
	24	unsigned long start_address;
	25	const char *name;
	26	};
	27
	28	static struct addr_marker address_markers[] = {
	29	{ MODULES_VADDR, "Modules" },
	30	{ PAGE_OFFSET, "Kernel Mapping" },
	31	{ 0, "vmalloc() Area" },
	32	{ VMALLOC_END, "vmalloc() End" },
	33	{ FIXADDR_START, "Fixmap Area" },
	34	{ CONFIG_VECTORS_BASE, "Vectors" },
	35	{ CONFIG_VECTORS_BASE + PAGE_SIZE * 2, "Vectors End" },
	36	{ -1, NULL },
	37	};
	38
	39	struct pg_state {
	40	struct seq_file *seq;
	41	const struct addr_marker *marker;
	42	unsigned long start_address;
	43	unsigned level;
	44	u64 current_prot;
	45	};
	46
	47	struct prot_bits {
	48	u64 mask;
	49	u64 val;
	50	const char *set;
	51	const char *clear;
	52	};
	53
	54	static const struct prot_bits pte_bits[] = {
	55	{
	56	.mask = L_PTE_USER,
	57	.val = L_PTE_USER,
	58	.set = "USR",
	59	.clear = " ",
	60	}, {
	61	.mask = L_PTE_RDONLY,
	62	.val = L_PTE_RDONLY,
	63	.set = "ro",
	64	.clear = "RW",
65	}, {
66	.mask = L_PTE_XN,
67	.val = L_PTE_XN,
68	.set = "NX",
69	.clear = "x ",
70	}, {
71	.mask = L_PTE_SHARED,
72	.val = L_PTE_SHARED,
73	.set = "SHD",
74	.clear = " ",
75	}, {
76	.mask = L_PTE_MT_MASK,
77	.val = L_PTE_MT_UNCACHED,
78	.set = "SO/UNCACHED",
79	}, {
80	.mask = L_PTE_MT_MASK,
81	.val = L_PTE_MT_BUFFERABLE,
82	.set = "MEM/BUFFERABLE/WC",
83	}, {
84	.mask = L_PTE_MT_MASK,
85	.val = L_PTE_MT_WRITETHROUGH,
86	.set = "MEM/CACHED/WT",
87	}, {
88	.mask = L_PTE_MT_MASK,
89	.val = L_PTE_MT_WRITEBACK,
90	.set = "MEM/CACHED/WBRA",
91	#ifndef CONFIG_ARM_LPAE
92	}, {
93	.mask = L_PTE_MT_MASK,
94	.val = L_PTE_MT_MINICACHE,
95	.set = "MEM/MINICACHE",
96	#endif
97	}, {
98	.mask = L_PTE_MT_MASK,
99	.val = L_PTE_MT_WRITEALLOC,
100	.set = "MEM/CACHED/WBWA",
101	}, {
102	.mask = L_PTE_MT_MASK,
103	.val = L_PTE_MT_DEV_SHARED,
104	.set = "DEV/SHARED",
105	#ifndef CONFIG_ARM_LPAE
106	}, {
107	.mask = L_PTE_MT_MASK,
108	.val = L_PTE_MT_DEV_NONSHARED,
109	.set = "DEV/NONSHARED",
110	#endif
111	}, {
112	.mask = L_PTE_MT_MASK,
113	.val = L_PTE_MT_DEV_WC,
114	.set = "DEV/WC",
115	}, {
116	.mask = L_PTE_MT_MASK,
117	.val = L_PTE_MT_DEV_CACHED,
118	.set = "DEV/CACHED",
119	},
120	};
121
122	static const struct prot_bits section_bits[] = {
fff00db8 KC	123	#ifdef CONFIG_ARM_LPAE
	124	{
	125	.mask = PMD_SECT_USER,
	126	.val = PMD_SECT_USER,
	127	.set = "USR",
	128	}, {
ded94779 SC	129	.mask = L_PMD_SECT_RDONLY,
ded94779 SC	130	.val = L_PMD_SECT_RDONLY,
fff00db8 KC	131	.set = "ro",
	132	.clear = "RW",
	133	#elif __LINUX_ARM_ARCH__ >= 6
1fd15b87	134	{
fff00db8 KC	135	.mask = PMD_SECT_APX \| PMD_SECT_AP_READ \| PMD_SECT_AP_WRITE,
fff00db8 KC	136	.val = PMD_SECT_APX \| PMD_SECT_AP_WRITE,
1fd15b87 RK	137	.set = " ro",
1fd15b87 RK	138	}, {
fff00db8	139	.mask = PMD_SECT_APX \| PMD_SECT_AP_READ \| PMD_SECT_AP_WRITE,
1fd15b87 RK	140	.val = PMD_SECT_AP_WRITE,
	141	.set = " RW",
	142	}, {
fff00db8	143	.mask = PMD_SECT_APX \| PMD_SECT_AP_READ \| PMD_SECT_AP_WRITE,
1fd15b87 RK	144	.val = PMD_SECT_AP_READ,
	145	.set = "USR ro",
	146	}, {
fff00db8	147	.mask = PMD_SECT_APX \| PMD_SECT_AP_READ \| PMD_SECT_AP_WRITE,
1fd15b87 RK	148	.val = PMD_SECT_AP_READ \| PMD_SECT_AP_WRITE,
1fd15b87 RK	149	.set = "USR RW",
fff00db8 KC	150	#else /* ARMv4/ARMv5 */
fff00db8 KC	151	/* These are approximate */
1fd15b87	152	{
fff00db8 KC	153	.mask = PMD_SECT_AP_READ \| PMD_SECT_AP_WRITE,
	154	.val = 0,
	155	.set = " ro",
1fd15b87	156	}, {
fff00db8 KC	157	.mask = PMD_SECT_AP_READ \| PMD_SECT_AP_WRITE,
	158	.val = PMD_SECT_AP_WRITE,
	159	.set = " RW",
	160	}, {
	161	.mask = PMD_SECT_AP_READ \| PMD_SECT_AP_WRITE,
	162	.val = PMD_SECT_AP_READ,
	163	.set = "USR ro",
	164	}, {
	165	.mask = PMD_SECT_AP_READ \| PMD_SECT_AP_WRITE,
	166	.val = PMD_SECT_AP_READ \| PMD_SECT_AP_WRITE,
	167	.set = "USR RW",
1fd15b87 RK	168	#endif
	169	}, {
	170	.mask = PMD_SECT_XN,
	171	.val = PMD_SECT_XN,
	172	.set = "NX",
	173	.clear = "x ",
	174	}, {
	175	.mask = PMD_SECT_S,
	176	.val = PMD_SECT_S,
	177	.set = "SHD",
	178	.clear = " ",
	179	},
	180	};
	181
	182	struct pg_level {
	183	const struct prot_bits *bits;
	184	size_t num;
	185	u64 mask;
	186	};
	187
	188	static struct pg_level pg_level[] = {
	189	{
	190	}, { /* pgd */
	191	}, { /* pud */
	192	}, { /* pmd */
	193	.bits = section_bits,
	194	.num = ARRAY_SIZE(section_bits),
	195	}, { /* pte */
	196	.bits = pte_bits,
	197	.num = ARRAY_SIZE(pte_bits),
	198	},
	199	};
	200
	201	static void dump_prot(struct pg_state st, const struct prot_bits bits, size_t num)
	202	{
	203	unsigned i;
	204
	205	for (i = 0; i < num; i++, bits++) {
	206	const char *s;
	207
	208	if ((st->current_prot & bits->mask) == bits->val)
	209	s = bits->set;
	210	else
	211	s = bits->clear;
	212
	213	if (s)
	214	seq_printf(st->seq, " %s", s);
	215	}
	216	}
	217
	218	static void note_page(struct pg_state *st, unsigned long addr, unsigned level, u64 val)
	219	{
	220	static const char units[] = "KMGTPE";
	221	u64 prot = val & pg_level[level].mask;
	222
	223	if (addr < USER_PGTABLES_CEILING)
	224	return;
	225
	226	if (!st->level) {
	227	st->level = level;
	228	st->current_prot = prot;
	229	seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	230	} else if (prot != st->current_prot \|\| level != st->level \|\|
	231	addr >= st->marker[1].start_address) {
232	const char *unit = units;
233	unsigned long delta;
234
235	if (st->current_prot) {
236	seq_printf(st->seq, "0x%08lx-0x%08lx ",
237	st->start_address, addr);
238
239	delta = (addr - st->start_address) >> 10;
240	while (!(delta & 1023) && unit[1]) {
241	delta >>= 10;
242	unit++;
243	}
244	seq_printf(st->seq, "%9lu%c", delta, *unit);
245	if (pg_level[st->level].bits)
246	dump_prot(st, pg_level[st->level].bits, pg_level[st->level].num);
247	seq_printf(st->seq, "\n");
248	}
249
250	if (addr >= st->marker[1].start_address) {
251	st->marker++;
252	seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
253	}
254	st->start_address = addr;
255	st->current_prot = prot;
256	st->level = level;
257	}
258	}
259
260	static void walk_pte(struct pg_state st, pmd_t pmd, unsigned long start)
261	{
262	pte_t *pte = pte_offset_kernel(pmd, 0);
263	unsigned long addr;
264	unsigned i;
265
266	for (i = 0; i < PTRS_PER_PTE; i++, pte++) {
267	addr = start + i * PAGE_SIZE;
268	note_page(st, addr, 4, pte_val(*pte));
269	}
270	}
271
272	static void walk_pmd(struct pg_state st, pud_t pud, unsigned long start)
273	{
274	pmd_t *pmd = pmd_offset(pud, 0);
275	unsigned long addr;
276	unsigned i;
277
278	for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
279	addr = start + i * PMD_SIZE;
280	if (pmd_none(pmd) \|\| pmd_large(pmd) \|\| !pmd_present(*pmd))
281	note_page(st, addr, 3, pmd_val(*pmd));
282	else
283	walk_pte(st, pmd, addr);
cd91b2fe KC	284
	285	if (SECTION_SIZE < PMD_SIZE && pmd_large(pmd[1]))
	286	note_page(st, addr + SECTION_SIZE, 3, pmd_val(pmd[1]));
1fd15b87 RK	287	}
	288	}
	289
	290	static void walk_pud(struct pg_state st, pgd_t pgd, unsigned long start)
	291	{
	292	pud_t *pud = pud_offset(pgd, 0);
	293	unsigned long addr;
	294	unsigned i;
	295
	296	for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
	297	addr = start + i * PUD_SIZE;
	298	if (!pud_none(*pud)) {
	299	walk_pmd(st, pud, addr);
	300	} else {
	301	note_page(st, addr, 2, pud_val(*pud));
	302	}
	303	}
	304	}
	305
	306	static void walk_pgd(struct seq_file *m)
	307	{
	308	pgd_t *pgd = swapper_pg_dir;
	309	struct pg_state st;
	310	unsigned long addr;
	311	unsigned i, pgdoff = USER_PGTABLES_CEILING / PGDIR_SIZE;
	312
	313	memset(&st, 0, sizeof(st));
	314	st.seq = m;
	315	st.marker = address_markers;
	316
	317	pgd += pgdoff;
	318
	319	for (i = pgdoff; i < PTRS_PER_PGD; i++, pgd++) {
	320	addr = i * PGDIR_SIZE;
	321	if (!pgd_none(*pgd)) {
	322	walk_pud(&st, pgd, addr);
	323	} else {
	324	note_page(&st, addr, 1, pgd_val(*pgd));
	325	}
	326	}
	327
	328	note_page(&st, 0, 0, 0);
	329	}
	330
	331	static int ptdump_show(struct seq_file m, void v)
	332	{
	333	walk_pgd(m);
	334	return 0;
	335	}
	336
	337	static int ptdump_open(struct inode inode, struct file file)
	338	{
	339	return single_open(file, ptdump_show, NULL);
	340	}
	341
	342	static const struct file_operations ptdump_fops = {
	343	.open = ptdump_open,
	344	.read = seq_read,
	345	.llseek = seq_lseek,
	346	.release = single_release,
	347	};
	348
	349	static int ptdump_init(void)
	350	{
351	struct dentry *pe;
352	unsigned i, j;
353
354	for (i = 0; i < ARRAY_SIZE(pg_level); i++)
355	if (pg_level[i].bits)
356	for (j = 0; j < pg_level[i].num; j++)
357	pg_level[i].mask \|= pg_level[i].bits[j].mask;
358
359	address_markers[2].start_address = VMALLOC_START;
360
361	pe = debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
362	&ptdump_fops);
363	return pe ? 0 : -ENOMEM;
364	}
365	__initcall(ptdump_init);