ia64/linux-2.6.18-xen.hg

view include/asm-v850/uaccess.h @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 #ifndef __V850_UACCESS_H__
2 #define __V850_UACCESS_H__
4 /*
5 * User space memory access functions
6 */
8 #include <linux/errno.h>
9 #include <linux/string.h>
11 #include <asm/segment.h>
12 #include <asm/machdep.h>
14 #define VERIFY_READ 0
15 #define VERIFY_WRITE 1
17 static inline int access_ok (int type, const void *addr, unsigned long size)
18 {
19 /* XXX I guess we should check against real ram bounds at least, and
20 possibly make sure ADDR is not within the kernel.
21 For now we just check to make sure it's not a small positive
22 or negative value, as that will at least catch some kinds of
23 error. In particular, we make sure that ADDR's not within the
24 interrupt vector area, which we know starts at zero, or within the
25 peripheral-I/O area, which is located just _before_ zero. */
26 unsigned long val = (unsigned long)addr;
27 return val >= (0x80 + NUM_CPU_IRQS*16) && val < 0xFFFFF000;
28 }
30 /*
31 * The exception table consists of pairs of addresses: the first is the
32 * address of an instruction that is allowed to fault, and the second is
33 * the address at which the program should continue. No registers are
34 * modified, so it is entirely up to the continuation code to figure out
35 * what to do.
36 *
37 * All the routines below use bits of fixup code that are out of line
38 * with the main instruction path. This means when everything is well,
39 * we don't even have to jump over them. Further, they do not intrude
40 * on our cache or tlb entries.
41 */
43 struct exception_table_entry
44 {
45 unsigned long insn, fixup;
46 };
48 /* Returns 0 if exception not found and fixup otherwise. */
49 extern unsigned long search_exception_table (unsigned long);
52 /*
53 * These are the main single-value transfer routines. They automatically
54 * use the right size if we just have the right pointer type.
55 */
57 extern int bad_user_access_length (void);
59 #define __get_user(var, ptr) \
60 ({ \
61 int __gu_err = 0; \
62 typeof(*(ptr)) __gu_val = 0; \
63 switch (sizeof (*(ptr))) { \
64 case 1: \
65 case 2: \
66 case 4: \
67 __gu_val = *(ptr); \
68 break; \
69 case 8: \
70 memcpy(&__gu_val, ptr, sizeof(__gu_val)); \
71 break; \
72 default: \
73 __gu_val = 0; \
74 __gu_err = __get_user_bad (); \
75 break; \
76 } \
77 (var) = __gu_val; \
78 __gu_err; \
79 })
80 #define __get_user_bad() (bad_user_access_length (), (-EFAULT))
82 #define __put_user(var, ptr) \
83 ({ \
84 int __pu_err = 0; \
85 switch (sizeof (*(ptr))) { \
86 case 1: \
87 case 2: \
88 case 4: \
89 *(ptr) = (var); \
90 break; \
91 case 8: { \
92 typeof(*(ptr)) __pu_val = 0; \
93 memcpy(ptr, &__pu_val, sizeof(__pu_val)); \
94 } \
95 break; \
96 default: \
97 __pu_err = __put_user_bad (); \
98 break; \
99 } \
100 __pu_err; \
101 })
102 #define __put_user_bad() (bad_user_access_length (), (-EFAULT))
104 #define put_user(x, ptr) __put_user(x, ptr)
105 #define get_user(x, ptr) __get_user(x, ptr)
107 #define __copy_from_user(to, from, n) (memcpy (to, from, n), 0)
108 #define __copy_to_user(to, from, n) (memcpy(to, from, n), 0)
110 #define __copy_to_user_inatomic __copy_to_user
111 #define __copy_from_user_inatomic __copy_from_user
113 #define copy_from_user(to, from, n) __copy_from_user (to, from, n)
114 #define copy_to_user(to, from, n) __copy_to_user(to, from, n)
116 #define copy_to_user_ret(to,from,n,retval) \
117 ({ if (copy_to_user (to,from,n)) return retval; })
119 #define copy_from_user_ret(to,from,n,retval) \
120 ({ if (copy_from_user (to,from,n)) return retval; })
122 /*
123 * Copy a null terminated string from userspace.
124 */
126 static inline long
127 strncpy_from_user (char *dst, const char *src, long count)
128 {
129 char *tmp;
130 strncpy (dst, src, count);
131 for (tmp = dst; *tmp && count > 0; tmp++, count--)
132 ;
133 return tmp - dst;
134 }
136 /*
137 * Return the size of a string (including the ending 0)
138 *
139 * Return 0 on exception, a value greater than N if too long
140 */
141 static inline long strnlen_user (const char *src, long n)
142 {
143 return strlen (src) + 1;
144 }
146 #define strlen_user(str) strnlen_user (str, 32767)
148 /*
149 * Zero Userspace
150 */
152 static inline unsigned long
153 clear_user (void *to, unsigned long n)
154 {
155 memset (to, 0, n);
156 return 0;
157 }
159 #endif /* __V850_UACCESS_H__ */