1/*
 2 * User address space access functions.
 3 *
 4 *  For licencing details see kernel-base/COPYING
 5 */
 6
 7#include <linux/highmem.h>
 8#include <linux/module.h>
 9
10#include <asm/word-at-a-time.h>
11#include <linux/sched.h>
12
13/*
14 * We rely on the nested NMI work to allow atomic faults from the NMI path; the
15 * nested NMI paths are careful to preserve CR2.
16 */
17unsigned long
18copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
19{
20	unsigned long ret;
21
22	if (__range_not_ok(from, n, TASK_SIZE))
23		return 0;
 
 
 
24
25	/*
26	 * Even though this function is typically called from NMI/IRQ context
27	 * disable pagefaults so that its behaviour is consistent even when
28	 * called form other contexts.
29	 */
30	pagefault_disable();
31	ret = __copy_from_user_inatomic(to, from, n);
32	pagefault_enable();
33
34	return ret;
35}
36EXPORT_SYMBOL_GPL(copy_from_user_nmi);

 1/*
 2 * User address space access functions.
 3 *
 4 *  For licencing details see kernel-base/COPYING
 5 */
 6
 7#include <linux/uaccess.h>
 8#include <linux/export.h>
 9
10#include <asm/tlbflush.h>
 
11
12/*
13 * We rely on the nested NMI work to allow atomic faults from the NMI path; the
14 * nested NMI paths are careful to preserve CR2.
15 */
16unsigned long
17copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
18{
19	unsigned long ret;
20
21	if (__range_not_ok(from, n, TASK_SIZE))
22		return n;
23
24	if (!nmi_uaccess_okay())
25		return n;
26
27	/*
28	 * Even though this function is typically called from NMI/IRQ context
29	 * disable pagefaults so that its behaviour is consistent even when
30	 * called form other contexts.
31	 */
32	pagefault_disable();
33	ret = __copy_from_user_inatomic(to, from, n);
34	pagefault_enable();
35
36	return ret;
37}
38EXPORT_SYMBOL_GPL(copy_from_user_nmi);