bitops: introduce lock ops
[linux-2.6.git] / include / asm-h8300 / bitops.h
1 #ifndef _H8300_BITOPS_H
2 #define _H8300_BITOPS_H
3
4 /*
5  * Copyright 1992, Linus Torvalds.
6  * Copyright 2002, Yoshinori Sato
7  */
8
9 #include <linux/compiler.h>
10 #include <asm/system.h>
11
12 #ifdef __KERNEL__
13 /*
14  * Function prototypes to keep gcc -Wall happy
15  */
16
17 /*
18  * ffz = Find First Zero in word. Undefined if no zero exists,
19  * so code should check against ~0UL first..
20  */
21 static __inline__ unsigned long ffz(unsigned long word)
22 {
23         unsigned long result;
24
25         result = -1;
26         __asm__("1:\n\t"
27                 "shlr.l %2\n\t"
28                 "adds #1,%0\n\t"
29                 "bcs 1b"
30                 : "=r" (result)
31                 : "0"  (result),"r" (word));
32         return result;
33 }
34
35 #define H8300_GEN_BITOP_CONST(OP,BIT)                       \
36         case BIT:                                           \
37         __asm__(OP " #" #BIT ",@%0"::"r"(b_addr):"memory"); \
38         break;
39
40 #define H8300_GEN_BITOP(FNAME,OP)                                     \
41 static __inline__ void FNAME(int nr, volatile unsigned long* addr)    \
42 {                                                                     \
43         volatile unsigned char *b_addr;                               \
44         b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);    \
45         if (__builtin_constant_p(nr)) {                               \
46                 switch(nr & 7) {                                      \
47                         H8300_GEN_BITOP_CONST(OP,0)                   \
48                         H8300_GEN_BITOP_CONST(OP,1)                   \
49                         H8300_GEN_BITOP_CONST(OP,2)                   \
50                         H8300_GEN_BITOP_CONST(OP,3)                   \
51                         H8300_GEN_BITOP_CONST(OP,4)                   \
52                         H8300_GEN_BITOP_CONST(OP,5)                   \
53                         H8300_GEN_BITOP_CONST(OP,6)                   \
54                         H8300_GEN_BITOP_CONST(OP,7)                   \
55                 }                                                     \
56         } else {                                                      \
57                 __asm__(OP " %w0,@%1"::"r"(nr),"r"(b_addr):"memory"); \
58         }                                                             \
59 }
60
61 /*
62  * clear_bit() doesn't provide any barrier for the compiler.
63  */
64 #define smp_mb__before_clear_bit()      barrier()
65 #define smp_mb__after_clear_bit()       barrier()
66
67 H8300_GEN_BITOP(set_bit   ,"bset")
68 H8300_GEN_BITOP(clear_bit ,"bclr")
69 H8300_GEN_BITOP(change_bit,"bnot")
70 #define __set_bit(nr,addr)    set_bit((nr),(addr))
71 #define __clear_bit(nr,addr)  clear_bit((nr),(addr))
72 #define __change_bit(nr,addr) change_bit((nr),(addr))
73
74 #undef H8300_GEN_BITOP
75 #undef H8300_GEN_BITOP_CONST
76
77 static __inline__ int test_bit(int nr, const unsigned long* addr)
78 {
79         return (*((volatile unsigned char *)addr + 
80                ((nr >> 3) ^ 3)) & (1UL << (nr & 7))) != 0;
81 }
82
83 #define __test_bit(nr, addr) test_bit(nr, addr)
84
85 #define H8300_GEN_TEST_BITOP_CONST_INT(OP,BIT)                       \
86         case BIT:                                                    \
87         __asm__("stc ccr,%w1\n\t"                                    \
88                 "orc #0x80,ccr\n\t"                                  \
89                 "bld #" #BIT ",@%4\n\t"                              \
90                 OP " #" #BIT ",@%4\n\t"                              \
91                 "rotxl.l %0\n\t"                                     \
92                 "ldc %w1,ccr"                                        \
93                 : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr)          \
94                 : "0" (retval),"r" (b_addr)                          \
95                 : "memory");                                         \
96         break;
97
98 #define H8300_GEN_TEST_BITOP_CONST(OP,BIT)                           \
99         case BIT:                                                    \
100         __asm__("bld #" #BIT ",@%3\n\t"                              \
101                 OP " #" #BIT ",@%3\n\t"                              \
102                 "rotxl.l %0\n\t"                                     \
103                 : "=r"(retval),"=m"(*b_addr)                         \
104                 : "0" (retval),"r" (b_addr)                          \
105                 : "memory");                                         \
106         break;
107
108 #define H8300_GEN_TEST_BITOP(FNNAME,OP)                              \
109 static __inline__ int FNNAME(int nr, volatile void * addr)           \
110 {                                                                    \
111         int retval = 0;                                              \
112         char ccrsave;                                                \
113         volatile unsigned char *b_addr;                              \
114         b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);   \
115         if (__builtin_constant_p(nr)) {                              \
116                 switch(nr & 7) {                                     \
117                         H8300_GEN_TEST_BITOP_CONST_INT(OP,0)         \
118                         H8300_GEN_TEST_BITOP_CONST_INT(OP,1)         \
119                         H8300_GEN_TEST_BITOP_CONST_INT(OP,2)         \
120                         H8300_GEN_TEST_BITOP_CONST_INT(OP,3)         \
121                         H8300_GEN_TEST_BITOP_CONST_INT(OP,4)         \
122                         H8300_GEN_TEST_BITOP_CONST_INT(OP,5)         \
123                         H8300_GEN_TEST_BITOP_CONST_INT(OP,6)         \
124                         H8300_GEN_TEST_BITOP_CONST_INT(OP,7)         \
125                 }                                                    \
126         } else {                                                     \
127                 __asm__("stc ccr,%w1\n\t"                            \
128                         "orc #0x80,ccr\n\t"                          \
129                         "btst %w5,@%4\n\t"                           \
130                         OP " %w5,@%4\n\t"                            \
131                         "beq 1f\n\t"                                 \
132                         "inc.l #1,%0\n"                              \
133                         "1:\n\t"                                     \
134                         "ldc %w1,ccr"                                \
135                         : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr)  \
136                         : "0" (retval),"r" (b_addr),"r"(nr)          \
137                         : "memory");                                 \
138         }                                                            \
139         return retval;                                               \
140 }                                                                    \
141                                                                      \
142 static __inline__ int __ ## FNNAME(int nr, volatile void * addr)     \
143 {                                                                    \
144         int retval = 0;                                              \
145         volatile unsigned char *b_addr;                              \
146         b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);   \
147         if (__builtin_constant_p(nr)) {                              \
148                 switch(nr & 7) {                                     \
149                         H8300_GEN_TEST_BITOP_CONST(OP,0)             \
150                         H8300_GEN_TEST_BITOP_CONST(OP,1)             \
151                         H8300_GEN_TEST_BITOP_CONST(OP,2)             \
152                         H8300_GEN_TEST_BITOP_CONST(OP,3)             \
153                         H8300_GEN_TEST_BITOP_CONST(OP,4)             \
154                         H8300_GEN_TEST_BITOP_CONST(OP,5)             \
155                         H8300_GEN_TEST_BITOP_CONST(OP,6)             \
156                         H8300_GEN_TEST_BITOP_CONST(OP,7)             \
157                 }                                                    \
158         } else {                                                     \
159                 __asm__("btst %w4,@%3\n\t"                           \
160                         OP " %w4,@%3\n\t"                            \
161                         "beq 1f\n\t"                                 \
162                         "inc.l #1,%0\n"                              \
163                         "1:"                                         \
164                         : "=r"(retval),"=m"(*b_addr)                 \
165                         : "0" (retval),"r" (b_addr),"r"(nr)          \
166                         : "memory");                                 \
167         }                                                            \
168         return retval;                                               \
169 }
170
171 H8300_GEN_TEST_BITOP(test_and_set_bit,   "bset")
172 H8300_GEN_TEST_BITOP(test_and_clear_bit, "bclr")
173 H8300_GEN_TEST_BITOP(test_and_change_bit,"bnot")
174 #undef H8300_GEN_TEST_BITOP_CONST
175 #undef H8300_GEN_TEST_BITOP_CONST_INT
176 #undef H8300_GEN_TEST_BITOP
177
178 #include <asm-generic/bitops/ffs.h>
179
180 static __inline__ unsigned long __ffs(unsigned long word)
181 {
182         unsigned long result;
183
184         result = -1;
185         __asm__("1:\n\t"
186                 "shlr.l %2\n\t"
187                 "adds #1,%0\n\t"
188                 "bcc 1b"
189                 : "=r" (result)
190                 : "0"(result),"r"(word));
191         return result;
192 }
193
194 #include <asm-generic/bitops/find.h>
195 #include <asm-generic/bitops/sched.h>
196 #include <asm-generic/bitops/hweight.h>
197 #include <asm-generic/bitops/lock.h>
198 #include <asm-generic/bitops/ext2-non-atomic.h>
199 #include <asm-generic/bitops/ext2-atomic.h>
200 #include <asm-generic/bitops/minix.h>
201
202 #endif /* __KERNEL__ */
203
204 #include <asm-generic/bitops/fls.h>
205 #include <asm-generic/bitops/fls64.h>
206
207 #endif /* _H8300_BITOPS_H */