[linux-2.6-block.git] / arch / x86 / kernel / cpu / mtrr / if.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/capability.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/proc_fs.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/init.h>

#define LINE_SIZE 80

#include <asm/mtrr.h>

#include "mtrr.h"

#define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private)

static const char *const mtrr_strings[MTRR_NUM_TYPES] =
{
	"uncachable",		/* 0 */
	"write-combining",	/* 1 */
	"?",			/* 2 */
	"?",			/* 3 */
	"write-through",	/* 4 */
	"write-protect",	/* 5 */
	"write-back",		/* 6 */
};

const char *mtrr_attrib_to_str(int x)
{
	return (x <= 6) ? mtrr_strings[x] : "?";
}

#ifdef CONFIG_PROC_FS

static int
mtrr_file_add(unsigned long base, unsigned long size,
	      unsigned int type, bool increment, struct file *file, int page)
{
	unsigned int *fcount = FILE_FCOUNT(file);
	int reg, max;

	max = num_var_ranges;
	if (fcount == NULL) {
		fcount = kcalloc(max, sizeof(*fcount), GFP_KERNEL);
		if (!fcount)
			return -ENOMEM;
		FILE_FCOUNT(file) = fcount;
	}
	if (!page) {
		if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
			return -EINVAL;
		base >>= PAGE_SHIFT;
		size >>= PAGE_SHIFT;
	}
	reg = mtrr_add_page(base, size, type, true);
	if (reg >= 0)
		++fcount[reg];
	return reg;
}

static int
mtrr_file_del(unsigned long base, unsigned long size,
	      struct file *file, int page)
{
	unsigned int *fcount = FILE_FCOUNT(file);
	int reg;

	if (!page) {
		if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
			return -EINVAL;
		base >>= PAGE_SHIFT;
		size >>= PAGE_SHIFT;
	}
	reg = mtrr_del_page(-1, base, size);
	if (reg < 0)
		return reg;
	if (fcount == NULL)
		return reg;
	if (fcount[reg] < 1)
		return -EINVAL;
	--fcount[reg];
	return reg;
}

/*
 * seq_file can seek but we ignore it.
 *
 * Format of control line:
 *    "base=%Lx size=%Lx type=%s" or "disable=%d"
 */
static ssize_t
mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
{
	int i, err;
	unsigned long reg;
	unsigned long long base, size;
	char *ptr;
	char line[LINE_SIZE];
	int length;

	memset(line, 0, LINE_SIZE);

	len = min_t(size_t, len, LINE_SIZE - 1);
	length = strncpy_from_user(line, buf, len);
	if (length < 0)
		return length;

	ptr = line + length - 1;
	if (length && *ptr == '\n')
		*ptr = '\0';

	if (!strncmp(line, "disable=", 8)) {
		reg = simple_strtoul(line + 8, &ptr, 0);
		err = mtrr_del_page(reg, 0, 0);
		if (err < 0)
			return err;
		return len;
	}

	if (strncmp(line, "base=", 5))
		return -EINVAL;

	base = simple_strtoull(line + 5, &ptr, 0);
	ptr = skip_spaces(ptr);

	if (strncmp(ptr, "size=", 5))
		return -EINVAL;

	size = simple_strtoull(ptr + 5, &ptr, 0);
	if ((base & 0xfff) || (size & 0xfff))
		return -EINVAL;
	ptr = skip_spaces(ptr);

	if (strncmp(ptr, "type=", 5))
		return -EINVAL;
	ptr = skip_spaces(ptr + 5);

	i = match_string(mtrr_strings, MTRR_NUM_TYPES, ptr);
	if (i < 0)
		return i;

	base >>= PAGE_SHIFT;
	size >>= PAGE_SHIFT;
	err = mtrr_add_page((unsigned long)base, (unsigned long)size, i, true);
	if (err < 0)
		return err;
	return len;
}

static long
mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
{
	int err = 0;
	mtrr_type type;
	unsigned long base;
	unsigned long size;
	struct mtrr_sentry sentry;
	struct mtrr_gentry gentry;
	void __user *arg = (void __user *) __arg;

	memset(&gentry, 0, sizeof(gentry));

	switch (cmd) {
	case MTRRIOC_ADD_ENTRY:
	case MTRRIOC_SET_ENTRY:
	case MTRRIOC_DEL_ENTRY:
	case MTRRIOC_KILL_ENTRY:
	case MTRRIOC_ADD_PAGE_ENTRY:
	case MTRRIOC_SET_PAGE_ENTRY:
	case MTRRIOC_DEL_PAGE_ENTRY:
	case MTRRIOC_KILL_PAGE_ENTRY:
		if (copy_from_user(&sentry, arg, sizeof(sentry)))
			return -EFAULT;
		break;
	case MTRRIOC_GET_ENTRY:
	case MTRRIOC_GET_PAGE_ENTRY:
		if (copy_from_user(&gentry, arg, sizeof(gentry)))
			return -EFAULT;
		break;
#ifdef CONFIG_COMPAT
	case MTRRIOC32_ADD_ENTRY:
	case MTRRIOC32_SET_ENTRY:
	case MTRRIOC32_DEL_ENTRY:
	case MTRRIOC32_KILL_ENTRY:
	case MTRRIOC32_ADD_PAGE_ENTRY:
	case MTRRIOC32_SET_PAGE_ENTRY:
	case MTRRIOC32_DEL_PAGE_ENTRY:
	case MTRRIOC32_KILL_PAGE_ENTRY: {
		struct mtrr_sentry32 __user *s32;

		s32 = (struct mtrr_sentry32 __user *)__arg;
		err = get_user(sentry.base, &s32->base);
		err |= get_user(sentry.size, &s32->size);
		err |= get_user(sentry.type, &s32->type);
		if (err)
			return err;
		break;
	}
	case MTRRIOC32_GET_ENTRY:
	case MTRRIOC32_GET_PAGE_ENTRY: {
		struct mtrr_gentry32 __user *g32;

		g32 = (struct mtrr_gentry32 __user *)__arg;
		err = get_user(gentry.regnum, &g32->regnum);
		err |= get_user(gentry.base, &g32->base);
		err |= get_user(gentry.size, &g32->size);
		err |= get_user(gentry.type, &g32->type);
		if (err)
			return err;
		break;
	}
#endif
	}

	switch (cmd) {
	default:
		return -ENOTTY;
	case MTRRIOC_ADD_ENTRY:
#ifdef CONFIG_COMPAT
	case MTRRIOC32_ADD_ENTRY:
#endif
		err =
		    mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
				  file, 0);
		break;
	case MTRRIOC_SET_ENTRY:
#ifdef CONFIG_COMPAT
	case MTRRIOC32_SET_ENTRY:
#endif
		err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
		break;
	case MTRRIOC_DEL_ENTRY:
#ifdef CONFIG_COMPAT
	case MTRRIOC32_DEL_ENTRY:
#endif
		err = mtrr_file_del(sentry.base, sentry.size, file, 0);
		break;
	case MTRRIOC_KILL_ENTRY:
#ifdef CONFIG_COMPAT
	case MTRRIOC32_KILL_ENTRY:
#endif
		err = mtrr_del(-1, sentry.base, sentry.size);
		break;
	case MTRRIOC_GET_ENTRY:
#ifdef CONFIG_COMPAT
	case MTRRIOC32_GET_ENTRY:
#endif
		if (gentry.regnum >= num_var_ranges)
			return -EINVAL;
		mtrr_if->get(gentry.regnum, &base, &size, &type);

		/* Hide entries that go above 4GB */
		if (base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
		    || size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)))
			gentry.base = gentry.size = gentry.type = 0;
		else {
			gentry.base = base << PAGE_SHIFT;
			gentry.size = size << PAGE_SHIFT;
			gentry.type = type;
		}

		break;
	case MTRRIOC_ADD_PAGE_ENTRY:
#ifdef CONFIG_COMPAT
	case MTRRIOC32_ADD_PAGE_ENTRY:
#endif
		err =
		    mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
				  file, 1);
		break;
	case MTRRIOC_SET_PAGE_ENTRY:
#ifdef CONFIG_COMPAT
	case MTRRIOC32_SET_PAGE_ENTRY:
#endif
		err =
		    mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
		break;
	case MTRRIOC_DEL_PAGE_ENTRY:
#ifdef CONFIG_COMPAT
	case MTRRIOC32_DEL_PAGE_ENTRY:
#endif
		err = mtrr_file_del(sentry.base, sentry.size, file, 1);
		break;
	case MTRRIOC_KILL_PAGE_ENTRY:
#ifdef CONFIG_COMPAT
	case MTRRIOC32_KILL_PAGE_ENTRY:
#endif
		err = mtrr_del_page(-1, sentry.base, sentry.size);
		break;
	case MTRRIOC_GET_PAGE_ENTRY:
#ifdef CONFIG_COMPAT
	case MTRRIOC32_GET_PAGE_ENTRY:
#endif
		if (gentry.regnum >= num_var_ranges)
			return -EINVAL;
		mtrr_if->get(gentry.regnum, &base, &size, &type);
		/* Hide entries that would overflow */
		if (size != (__typeof__(gentry.size))size)
			gentry.base = gentry.size = gentry.type = 0;
		else {
			gentry.base = base;
			gentry.size = size;
			gentry.type = type;
		}
		break;
	}

	if (err)
		return err;

	switch (cmd) {
	case MTRRIOC_GET_ENTRY:
	case MTRRIOC_GET_PAGE_ENTRY:
		if (copy_to_user(arg, &gentry, sizeof(gentry)))
			err = -EFAULT;
		break;
#ifdef CONFIG_COMPAT
	case MTRRIOC32_GET_ENTRY:
	case MTRRIOC32_GET_PAGE_ENTRY: {
		struct mtrr_gentry32 __user *g32;

		g32 = (struct mtrr_gentry32 __user *)__arg;
		err = put_user(gentry.base, &g32->base);
		err |= put_user(gentry.size, &g32->size);
		err |= put_user(gentry.regnum, &g32->regnum);
		err |= put_user(gentry.type, &g32->type);
		break;
	}
#endif
	}
	return err;
}

static int mtrr_close(struct inode *ino, struct file *file)
{
	unsigned int *fcount = FILE_FCOUNT(file);
	int i, max;

	if (fcount != NULL) {
		max = num_var_ranges;
		for (i = 0; i < max; ++i) {
			while (fcount[i] > 0) {
				mtrr_del(i, 0, 0);
				--fcount[i];
			}
		}
		kfree(fcount);
		FILE_FCOUNT(file) = NULL;
	}
	return single_release(ino, file);
}

static int mtrr_seq_show(struct seq_file *seq, void *offset)
{
	char factor;
	int i, max;
	mtrr_type type;
	unsigned long base, size;

	max = num_var_ranges;
	for (i = 0; i < max; i++) {
		mtrr_if->get(i, &base, &size, &type);
		if (size == 0) {
			mtrr_usage_table[i] = 0;
			continue;
		}
		if (size < (0x100000 >> PAGE_SHIFT)) {
			/* less than 1MB */
			factor = 'K';
			size <<= PAGE_SHIFT - 10;
		} else {
			factor = 'M';
			size >>= 20 - PAGE_SHIFT;
		}
		/* Base can be > 32bit */
		seq_printf(seq, "reg%02i: base=0x%06lx000 (%5luMB), size=%5lu%cB, count=%d: %s\n",
			   i, base, base >> (20 - PAGE_SHIFT),
			   size, factor,
			   mtrr_usage_table[i], mtrr_attrib_to_str(type));
	}
	return 0;
}

static int mtrr_open(struct inode *inode, struct file *file)
{
	if (!mtrr_if)
		return -EIO;
	if (!mtrr_if->get)
		return -ENXIO;
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	return single_open(file, mtrr_seq_show, NULL);
}

static const struct proc_ops mtrr_proc_ops = {
	.proc_open		= mtrr_open,
	.proc_read		= seq_read,
	.proc_lseek		= seq_lseek,
	.proc_write		= mtrr_write,
	.proc_ioctl		= mtrr_ioctl,
#ifdef CONFIG_COMPAT
	.proc_compat_ioctl	= mtrr_ioctl,
#endif
	.proc_release		= mtrr_close,
};

static int __init mtrr_if_init(void)
{
	struct cpuinfo_x86 *c = &boot_cpu_data;

	if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
	    (!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
	    (!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
	    (!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
		return -ENODEV;

	proc_create("mtrr", S_IWUSR | S_IRUGO, NULL, &mtrr_proc_ops);
	return 0;
}
arch_initcall(mtrr_if_init);
#endif			/*  CONFIG_PROC_FS  */
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/capability.h>
	3	#include <linux/seq_file.h>
	4	#include <linux/uaccess.h>
	5	#include <linux/proc_fs.h>
	6	#include <linux/ctype.h>
	7	#include <linux/string.h>
	8	#include <linux/slab.h>
	9	#include <linux/init.h>
	10
	11	#define LINE_SIZE 80
	12
	13	#include <asm/mtrr.h>
	14
	15	#include "mtrr.h"
	16
	17	#define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private)
	18
	19	static const char *const mtrr_strings[MTRR_NUM_TYPES] =
	20	{
	21	"uncachable", /* 0 */
	22	"write-combining", /* 1 */
	23	"?", /* 2 */
	24	"?", /* 3 */
	25	"write-through", /* 4 */
	26	"write-protect", /* 5 */
	27	"write-back", /* 6 */
	28	};
	29
	30	const char *mtrr_attrib_to_str(int x)
	31	{
	32	return (x <= 6) ? mtrr_strings[x] : "?";
	33	}
	34
	35	#ifdef CONFIG_PROC_FS
	36
	37	static int
	38	mtrr_file_add(unsigned long base, unsigned long size,
	39	unsigned int type, bool increment, struct file *file, int page)
	40	{
	41	unsigned int *fcount = FILE_FCOUNT(file);
	42	int reg, max;
	43
	44	max = num_var_ranges;
	45	if (fcount == NULL) {
	46	fcount = kcalloc(max, sizeof(*fcount), GFP_KERNEL);
	47	if (!fcount)
	48	return -ENOMEM;
	49	FILE_FCOUNT(file) = fcount;
	50	}
	51	if (!page) {
	52	if ((base & (PAGE_SIZE - 1)) \|\| (size & (PAGE_SIZE - 1)))
	53	return -EINVAL;
	54	base >>= PAGE_SHIFT;
	55	size >>= PAGE_SHIFT;
	56	}
	57	reg = mtrr_add_page(base, size, type, true);
	58	if (reg >= 0)
	59	++fcount[reg];
	60	return reg;
	61	}
	62
	63	static int
	64	mtrr_file_del(unsigned long base, unsigned long size,
	65	struct file *file, int page)
	66	{
	67	unsigned int *fcount = FILE_FCOUNT(file);
	68	int reg;
	69
	70	if (!page) {
	71	if ((base & (PAGE_SIZE - 1)) \|\| (size & (PAGE_SIZE - 1)))
	72	return -EINVAL;
	73	base >>= PAGE_SHIFT;
	74	size >>= PAGE_SHIFT;
	75	}
	76	reg = mtrr_del_page(-1, base, size);
	77	if (reg < 0)
	78	return reg;
	79	if (fcount == NULL)
	80	return reg;
	81	if (fcount[reg] < 1)
	82	return -EINVAL;
	83	--fcount[reg];
	84	return reg;
	85	}
	86
	87	/*
	88	* seq_file can seek but we ignore it.
	89	*
	90	* Format of control line:
	91	* "base=%Lx size=%Lx type=%s" or "disable=%d"
	92	*/
	93	static ssize_t
	94	mtrr_write(struct file file, const char __user buf, size_t len, loff_t * ppos)
	95	{
	96	int i, err;
	97	unsigned long reg;
	98	unsigned long long base, size;
	99	char *ptr;
	100	char line[LINE_SIZE];
	101	int length;
	102
	103	memset(line, 0, LINE_SIZE);
	104
	105	len = min_t(size_t, len, LINE_SIZE - 1);
	106	length = strncpy_from_user(line, buf, len);
	107	if (length < 0)
	108	return length;
	109
	110	ptr = line + length - 1;
	111	if (length && *ptr == '\n')
	112	*ptr = '\0';
	113
	114	if (!strncmp(line, "disable=", 8)) {
	115	reg = simple_strtoul(line + 8, &ptr, 0);
	116	err = mtrr_del_page(reg, 0, 0);
	117	if (err < 0)
	118	return err;
	119	return len;
	120	}
	121
	122	if (strncmp(line, "base=", 5))
	123	return -EINVAL;
	124
	125	base = simple_strtoull(line + 5, &ptr, 0);
	126	ptr = skip_spaces(ptr);
	127
	128	if (strncmp(ptr, "size=", 5))
	129	return -EINVAL;
	130
	131	size = simple_strtoull(ptr + 5, &ptr, 0);
	132	if ((base & 0xfff) \|\| (size & 0xfff))
	133	return -EINVAL;
	134	ptr = skip_spaces(ptr);
	135
	136	if (strncmp(ptr, "type=", 5))
	137	return -EINVAL;
	138	ptr = skip_spaces(ptr + 5);
	139
	140	i = match_string(mtrr_strings, MTRR_NUM_TYPES, ptr);
	141	if (i < 0)
	142	return i;
	143
	144	base >>= PAGE_SHIFT;
	145	size >>= PAGE_SHIFT;
	146	err = mtrr_add_page((unsigned long)base, (unsigned long)size, i, true);
	147	if (err < 0)
	148	return err;
	149	return len;
	150	}
	151
	152	static long
	153	mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
	154	{
	155	int err = 0;
	156	mtrr_type type;
	157	unsigned long base;
	158	unsigned long size;
	159	struct mtrr_sentry sentry;
	160	struct mtrr_gentry gentry;
	161	void __user arg = (void __user ) __arg;
	162
	163	memset(&gentry, 0, sizeof(gentry));
	164
	165	switch (cmd) {
	166	case MTRRIOC_ADD_ENTRY:
	167	case MTRRIOC_SET_ENTRY:
	168	case MTRRIOC_DEL_ENTRY:
	169	case MTRRIOC_KILL_ENTRY:
	170	case MTRRIOC_ADD_PAGE_ENTRY:
	171	case MTRRIOC_SET_PAGE_ENTRY:
	172	case MTRRIOC_DEL_PAGE_ENTRY:
	173	case MTRRIOC_KILL_PAGE_ENTRY:
	174	if (copy_from_user(&sentry, arg, sizeof(sentry)))
	175	return -EFAULT;
	176	break;
	177	case MTRRIOC_GET_ENTRY:
	178	case MTRRIOC_GET_PAGE_ENTRY:
	179	if (copy_from_user(&gentry, arg, sizeof(gentry)))
	180	return -EFAULT;
	181	break;
	182	#ifdef CONFIG_COMPAT
	183	case MTRRIOC32_ADD_ENTRY:
	184	case MTRRIOC32_SET_ENTRY:
	185	case MTRRIOC32_DEL_ENTRY:
	186	case MTRRIOC32_KILL_ENTRY:
	187	case MTRRIOC32_ADD_PAGE_ENTRY:
	188	case MTRRIOC32_SET_PAGE_ENTRY:
	189	case MTRRIOC32_DEL_PAGE_ENTRY:
	190	case MTRRIOC32_KILL_PAGE_ENTRY: {
	191	struct mtrr_sentry32 __user *s32;
	192
	193	s32 = (struct mtrr_sentry32 __user *)__arg;
	194	err = get_user(sentry.base, &s32->base);
	195	err \|= get_user(sentry.size, &s32->size);
	196	err \|= get_user(sentry.type, &s32->type);
	197	if (err)
	198	return err;
	199	break;
	200	}
	201	case MTRRIOC32_GET_ENTRY:
	202	case MTRRIOC32_GET_PAGE_ENTRY: {
	203	struct mtrr_gentry32 __user *g32;
	204
	205	g32 = (struct mtrr_gentry32 __user *)__arg;
	206	err = get_user(gentry.regnum, &g32->regnum);
	207	err \|= get_user(gentry.base, &g32->base);
	208	err \|= get_user(gentry.size, &g32->size);
	209	err \|= get_user(gentry.type, &g32->type);
	210	if (err)
	211	return err;
	212	break;
	213	}
	214	#endif
	215	}
	216
	217	switch (cmd) {
	218	default:
	219	return -ENOTTY;
	220	case MTRRIOC_ADD_ENTRY:
	221	#ifdef CONFIG_COMPAT
	222	case MTRRIOC32_ADD_ENTRY:
	223	#endif
	224	err =
	225	mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
	226	file, 0);
	227	break;
	228	case MTRRIOC_SET_ENTRY:
	229	#ifdef CONFIG_COMPAT
	230	case MTRRIOC32_SET_ENTRY:
	231	#endif
	232	err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
	233	break;
	234	case MTRRIOC_DEL_ENTRY:
	235	#ifdef CONFIG_COMPAT
	236	case MTRRIOC32_DEL_ENTRY:
	237	#endif
	238	err = mtrr_file_del(sentry.base, sentry.size, file, 0);
	239	break;
	240	case MTRRIOC_KILL_ENTRY:
	241	#ifdef CONFIG_COMPAT
	242	case MTRRIOC32_KILL_ENTRY:
	243	#endif
	244	err = mtrr_del(-1, sentry.base, sentry.size);
	245	break;
	246	case MTRRIOC_GET_ENTRY:
	247	#ifdef CONFIG_COMPAT
	248	case MTRRIOC32_GET_ENTRY:
	249	#endif
	250	if (gentry.regnum >= num_var_ranges)
	251	return -EINVAL;
	252	mtrr_if->get(gentry.regnum, &base, &size, &type);
	253
	254	/* Hide entries that go above 4GB */
	255	if (base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
	256	\|\| size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)))
	257	gentry.base = gentry.size = gentry.type = 0;
	258	else {
	259	gentry.base = base << PAGE_SHIFT;
	260	gentry.size = size << PAGE_SHIFT;
	261	gentry.type = type;
	262	}
	263
	264	break;
	265	case MTRRIOC_ADD_PAGE_ENTRY:
	266	#ifdef CONFIG_COMPAT
	267	case MTRRIOC32_ADD_PAGE_ENTRY:
	268	#endif
	269	err =
	270	mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
	271	file, 1);
	272	break;
	273	case MTRRIOC_SET_PAGE_ENTRY:
	274	#ifdef CONFIG_COMPAT
	275	case MTRRIOC32_SET_PAGE_ENTRY:
	276	#endif
	277	err =
	278	mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
	279	break;
	280	case MTRRIOC_DEL_PAGE_ENTRY:
	281	#ifdef CONFIG_COMPAT
	282	case MTRRIOC32_DEL_PAGE_ENTRY:
	283	#endif
	284	err = mtrr_file_del(sentry.base, sentry.size, file, 1);
	285	break;
	286	case MTRRIOC_KILL_PAGE_ENTRY:
	287	#ifdef CONFIG_COMPAT
	288	case MTRRIOC32_KILL_PAGE_ENTRY:
	289	#endif
	290	err = mtrr_del_page(-1, sentry.base, sentry.size);
	291	break;
	292	case MTRRIOC_GET_PAGE_ENTRY:
	293	#ifdef CONFIG_COMPAT
	294	case MTRRIOC32_GET_PAGE_ENTRY:
	295	#endif
	296	if (gentry.regnum >= num_var_ranges)
	297	return -EINVAL;
	298	mtrr_if->get(gentry.regnum, &base, &size, &type);
	299	/* Hide entries that would overflow */
	300	if (size != (__typeof__(gentry.size))size)
	301	gentry.base = gentry.size = gentry.type = 0;
	302	else {
	303	gentry.base = base;
	304	gentry.size = size;
	305	gentry.type = type;
	306	}
	307	break;
	308	}
	309
	310	if (err)
	311	return err;
	312
	313	switch (cmd) {
	314	case MTRRIOC_GET_ENTRY:
	315	case MTRRIOC_GET_PAGE_ENTRY:
	316	if (copy_to_user(arg, &gentry, sizeof(gentry)))
	317	err = -EFAULT;
	318	break;
	319	#ifdef CONFIG_COMPAT
	320	case MTRRIOC32_GET_ENTRY:
	321	case MTRRIOC32_GET_PAGE_ENTRY: {
	322	struct mtrr_gentry32 __user *g32;
	323
	324	g32 = (struct mtrr_gentry32 __user *)__arg;
	325	err = put_user(gentry.base, &g32->base);
	326	err \|= put_user(gentry.size, &g32->size);
	327	err \|= put_user(gentry.regnum, &g32->regnum);
	328	err \|= put_user(gentry.type, &g32->type);
	329	break;
	330	}
	331	#endif
	332	}
	333	return err;
	334	}
	335
	336	static int mtrr_close(struct inode ino, struct file file)
	337	{
	338	unsigned int *fcount = FILE_FCOUNT(file);
	339	int i, max;
	340
	341	if (fcount != NULL) {
	342	max = num_var_ranges;
	343	for (i = 0; i < max; ++i) {
	344	while (fcount[i] > 0) {
	345	mtrr_del(i, 0, 0);
	346	--fcount[i];
	347	}
	348	}
	349	kfree(fcount);
	350	FILE_FCOUNT(file) = NULL;
	351	}
	352	return single_release(ino, file);
	353	}
	354
	355	static int mtrr_seq_show(struct seq_file seq, void offset)
	356	{
	357	char factor;
	358	int i, max;
	359	mtrr_type type;
	360	unsigned long base, size;
	361
	362	max = num_var_ranges;
	363	for (i = 0; i < max; i++) {
	364	mtrr_if->get(i, &base, &size, &type);
	365	if (size == 0) {
	366	mtrr_usage_table[i] = 0;
	367	continue;
	368	}
	369	if (size < (0x100000 >> PAGE_SHIFT)) {
	370	/* less than 1MB */
	371	factor = 'K';
	372	size <<= PAGE_SHIFT - 10;
	373	} else {
	374	factor = 'M';
	375	size >>= 20 - PAGE_SHIFT;
	376	}
	377	/* Base can be > 32bit */
	378	seq_printf(seq, "reg%02i: base=0x%06lx000 (%5luMB), size=%5lu%cB, count=%d: %s\n",
	379	i, base, base >> (20 - PAGE_SHIFT),
	380	size, factor,
	381	mtrr_usage_table[i], mtrr_attrib_to_str(type));
	382	}
	383	return 0;
	384	}
	385
	386	static int mtrr_open(struct inode inode, struct file file)
	387	{
	388	if (!mtrr_if)
	389	return -EIO;
	390	if (!mtrr_if->get)
	391	return -ENXIO;
	392	if (!capable(CAP_SYS_ADMIN))
	393	return -EPERM;
	394	return single_open(file, mtrr_seq_show, NULL);
	395	}
	396
	397	static const struct proc_ops mtrr_proc_ops = {
	398	.proc_open = mtrr_open,
	399	.proc_read = seq_read,
	400	.proc_lseek = seq_lseek,
	401	.proc_write = mtrr_write,
	402	.proc_ioctl = mtrr_ioctl,
	403	#ifdef CONFIG_COMPAT
	404	.proc_compat_ioctl = mtrr_ioctl,
	405	#endif
	406	.proc_release = mtrr_close,
	407	};
	408
	409	static int __init mtrr_if_init(void)
	410	{
	411	struct cpuinfo_x86 *c = &boot_cpu_data;
	412
	413	if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
	414	(!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
	415	(!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
	416	(!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
	417	return -ENODEV;
	418
	419	proc_create("mtrr", S_IWUSR \| S_IRUGO, NULL, &mtrr_proc_ops);
	420	return 0;
	421	}
	422	arch_initcall(mtrr_if_init);
	423	#endif /* CONFIG_PROC_FS */