ia64/linux-2.6.18-xen.hg

view include/asm-h8300/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 __H8300_UACCESS_H
2 #define __H8300_UACCESS_H
4 /*
5 * User space memory access functions
6 */
7 #include <linux/sched.h>
8 #include <linux/mm.h>
9 #include <linux/string.h>
11 #include <asm/segment.h>
13 #define VERIFY_READ 0
14 #define VERIFY_WRITE 1
16 /* We let the MMU do all checking */
17 #define access_ok(type, addr, size) __access_ok((unsigned long)addr,size)
18 static inline int __access_ok(unsigned long addr, unsigned long size)
19 {
20 #define RANGE_CHECK_OK(addr, size, lower, upper) \
21 (((addr) >= (lower)) && (((addr) + (size)) < (upper)))
23 extern unsigned long _ramend;
24 return(RANGE_CHECK_OK(addr, size, 0L, (unsigned long)&_ramend));
25 }
27 /*
28 * The exception table consists of pairs of addresses: the first is the
29 * address of an instruction that is allowed to fault, and the second is
30 * the address at which the program should continue. No registers are
31 * modified, so it is entirely up to the continuation code to figure out
32 * what to do.
33 *
34 * All the routines below use bits of fixup code that are out of line
35 * with the main instruction path. This means when everything is well,
36 * we don't even have to jump over them. Further, they do not intrude
37 * on our cache or tlb entries.
38 */
40 struct exception_table_entry
41 {
42 unsigned long insn, fixup;
43 };
45 /* Returns 0 if exception not found and fixup otherwise. */
46 extern unsigned long search_exception_table(unsigned long);
49 /*
50 * These are the main single-value transfer routines. They automatically
51 * use the right size if we just have the right pointer type.
52 */
54 #define put_user(x, ptr) \
55 ({ \
56 int __pu_err = 0; \
57 typeof(*(ptr)) __pu_val = (x); \
58 switch (sizeof (*(ptr))) { \
59 case 1: \
60 case 2: \
61 case 4: \
62 *(ptr) = (__pu_val); \
63 break; \
64 case 8: \
65 memcpy(ptr, &__pu_val, sizeof (*(ptr))); \
66 break; \
67 default: \
68 __pu_err = __put_user_bad(); \
69 break; \
70 } \
71 __pu_err; \
72 })
73 #define __put_user(x, ptr) put_user(x, ptr)
75 extern int __put_user_bad(void);
77 /*
78 * Tell gcc we read from memory instead of writing: this is because
79 * we do not write to any memory gcc knows about, so there are no
80 * aliasing issues.
81 */
83 #define __ptr(x) ((unsigned long *)(x))
85 /*
86 * Tell gcc we read from memory instead of writing: this is because
87 * we do not write to any memory gcc knows about, so there are no
88 * aliasing issues.
89 */
91 #define get_user(x, ptr) \
92 ({ \
93 int __gu_err = 0; \
94 typeof(*(ptr)) __gu_val = 0; \
95 switch (sizeof(*(ptr))) { \
96 case 1: \
97 case 2: \
98 case 4: \
99 __gu_val = *(ptr); \
100 break; \
101 case 8: \
102 memcpy(&__gu_val, ptr, sizeof (*(ptr))); \
103 break; \
104 default: \
105 __gu_val = 0; \
106 __gu_err = __get_user_bad(); \
107 break; \
108 } \
109 (x) = __gu_val; \
110 __gu_err; \
111 })
112 #define __get_user(x, ptr) get_user(x, ptr)
114 extern int __get_user_bad(void);
116 #define copy_from_user(to, from, n) (memcpy(to, from, n), 0)
117 #define copy_to_user(to, from, n) (memcpy(to, from, n), 0)
119 #define __copy_from_user(to, from, n) copy_from_user(to, from, n)
120 #define __copy_to_user(to, from, n) copy_to_user(to, from, n)
121 #define __copy_to_user_inatomic __copy_to_user
122 #define __copy_from_user_inatomic __copy_from_user
124 #define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; })
126 #define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; })
128 /*
129 * Copy a null terminated string from userspace.
130 */
132 static inline long
133 strncpy_from_user(char *dst, const char *src, long count)
134 {
135 char *tmp;
136 strncpy(dst, src, count);
137 for (tmp = dst; *tmp && count > 0; tmp++, count--)
138 ;
139 return(tmp - dst); /* DAVIDM should we count a NUL ? check getname */
140 }
142 /*
143 * Return the size of a string (including the ending 0)
144 *
145 * Return 0 on exception, a value greater than N if too long
146 */
147 static inline long strnlen_user(const char *src, long n)
148 {
149 return(strlen(src) + 1); /* DAVIDM make safer */
150 }
152 #define strlen_user(str) strnlen_user(str, 32767)
154 /*
155 * Zero Userspace
156 */
158 static inline unsigned long
159 clear_user(void *to, unsigned long n)
160 {
161 memset(to, 0, n);
162 return 0;
163 }
165 #endif /* _H8300_UACCESS_H */