1 /* $Id: string.h,v 1.35 2000/05/02 01:47:01 davem Exp $
2 * string.h: External definitions for optimized assembly string
3 * routines for the Linux Kernel.
4 *
5 * Copyright (C) 1995,1996 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 */
8
9 #ifndef __SPARC_STRING_H__
10 #define __SPARC_STRING_H__
11
12 #include <asm/page.h>
13
14 /* Really, userland/ksyms should not see any of this stuff. */
15
16 #ifdef __KERNEL__
17
18 extern void __memmove(void *,const void *,__kernel_size_t);
19 extern __kernel_size_t __memcpy(void *,const void *,__kernel_size_t);
20 extern __kernel_size_t __memset(void *,int,__kernel_size_t);
21
22 #ifndef EXPORT_SYMTAB_STROPS
23
24 /* First the mem*() things. */
25 #define __HAVE_ARCH_BCOPY
26 #define __HAVE_ARCH_MEMMOVE
27 #undef memmove
28 #define memmove(_to, _from, _n) \
29 ({ \
30 void *_t = (_to); \
31 __memmove(_t, (_from), (_n)); \
32 _t; \
33 })
34
35 #define __HAVE_ARCH_MEMCPY
36
37 static inline void *__constant_memcpy(void *to, const void *from, __kernel_size_t n)
38 {
39 extern void __copy_1page(void *, const void *);
40
41 if(n <= 32) {
42 __builtin_memcpy(to, from, n);
43 } else {
44 switch(n) {
45 case PAGE_SIZE:
46 __copy_1page(to, from);
47 break;
48 default:
49 __memcpy(to, from, n);
50 break;
51 }
52 }
53 return to;
54 }
55
56 static inline void *__nonconstant_memcpy(void *to, const void *from, __kernel_size_t n)
57 {
58 __memcpy(to, from, n);
59 return to;
60 }
61
62 #undef memcpy
63 #define memcpy(t, f, n) \
64 (__builtin_constant_p(n) ? \
65 __constant_memcpy((t),(f),(n)) : \
66 __nonconstant_memcpy((t),(f),(n)))
67
68 #define __HAVE_ARCH_MEMSET
69
70 static inline void *__constant_c_and_count_memset(void *s, char c, __kernel_size_t count)
71 {
72 extern void bzero_1page(void *);
73 extern __kernel_size_t __bzero(void *, __kernel_size_t);
74
75 if(!c) {
76 if(count == PAGE_SIZE)
77 bzero_1page(s);
78 else
79 __bzero(s, count);
80 } else {
81 __memset(s, c, count);
82 }
83 return s;
84 }
85
86 static inline void *__constant_c_memset(void *s, char c, __kernel_size_t count)
87 {
88 extern __kernel_size_t __bzero(void *, __kernel_size_t);
89
90 if(!c)
91 __bzero(s, count);
92 else
93 __memset(s, c, count);
94 return s;
95 }
96
97 static inline void *__nonconstant_memset(void *s, char c, __kernel_size_t count)
98 {
99 __memset(s, c, count);
100 return s;
101 }
102
103 #undef memset
104 #define memset(s, c, count) \
105 (__builtin_constant_p(c) ? (__builtin_constant_p(count) ? \
106 __constant_c_and_count_memset((s), (c), (count)) : \
107 __constant_c_memset((s), (c), (count))) \
108 : __nonconstant_memset((s), (c), (count)))
109
110 #define __HAVE_ARCH_MEMSCAN
111
112 #undef memscan
113 #define memscan(__arg0, __char, __arg2) \
114 ({ \
115 extern void *__memscan_zero(void *, size_t); \
116 extern void *__memscan_generic(void *, int, size_t); \
117 void *__retval, *__addr = (__arg0); \
118 size_t __size = (__arg2); \
119 \
120 if(__builtin_constant_p(__char) && !(__char)) \
121 __retval = __memscan_zero(__addr, __size); \
122 else \
123 __retval = __memscan_generic(__addr, (__char), __size); \
124 \
125 __retval; \
126 })
127
128 #define __HAVE_ARCH_MEMCMP
129
130 /* Now the str*() stuff... */
131 #define __HAVE_ARCH_STRLEN
132
133 #define __HAVE_ARCH_STRNCMP
134
135 extern int __strncmp(const char *, const char *, __kernel_size_t);
136
137 static inline int __constant_strncmp(const char *src, const char *dest, __kernel_size_t count)
138 {
139 register int retval;
140 switch(count) {
141 case 0: return 0;
142 case 1: return (src[0] - dest[0]);
143 case 2: retval = (src[0] - dest[0]);
144 if(!retval && src[0])
145 retval = (src[1] - dest[1]);
146 return retval;
147 case 3: retval = (src[0] - dest[0]);
148 if(!retval && src[0]) {
149 retval = (src[1] - dest[1]);
150 if(!retval && src[1])
151 retval = (src[2] - dest[2]);
152 }
153 return retval;
154 case 4: retval = (src[0] - dest[0]);
155 if(!retval && src[0]) {
156 retval = (src[1] - dest[1]);
157 if(!retval && src[1]) {
158 retval = (src[2] - dest[2]);
159 if (!retval && src[2])
160 retval = (src[3] - dest[3]);
161 }
162 }
163 return retval;
164 case 5: retval = (src[0] - dest[0]);
165 if(!retval && src[0]) {
166 retval = (src[1] - dest[1]);
167 if(!retval && src[1]) {
168 retval = (src[2] - dest[2]);
169 if (!retval && src[2]) {
170 retval = (src[3] - dest[3]);
171 if (!retval && src[3])
172 retval = (src[4] - dest[4]);
173 }
174 }
175 }
176 return retval;
177 default:
178 retval = (src[0] - dest[0]);
179 if(!retval && src[0]) {
180 retval = (src[1] - dest[1]);
181 if(!retval && src[1]) {
182 retval = (src[2] - dest[2]);
183 if(!retval && src[2])
184 retval = __strncmp(src+3,dest+3,count-3);
185 }
186 }
187 return retval;
188 }
189 }
190
191 #undef strncmp
192 #define strncmp(__arg0, __arg1, __arg2) \
193 (__builtin_constant_p(__arg2) ? \
194 __constant_strncmp(__arg0, __arg1, __arg2) : \
195 __strncmp(__arg0, __arg1, __arg2))
196
197 #endif /* !EXPORT_SYMTAB_STROPS */
198
199 #endif /* __KERNEL__ */
200
201 #endif /* !(__SPARC_STRING_H__) */
202
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