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bitops.h
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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 
11 #ifdef __KERNEL__
12 
13 #ifndef _LINUX_BITOPS_H
14 #error only <linux/bitops.h> can be included directly
15 #endif
16 
17 /*
18  * Function prototypes to keep gcc -Wall happy
19  */
20 
21 /*
22  * ffz = Find First Zero in word. Undefined if no zero exists,
23  * so code should check against ~0UL first..
24  */
25 static __inline__ unsigned long ffz(unsigned long word)
26 {
27  unsigned long result;
28 
29  result = -1;
30  __asm__("1:\n\t"
31  "shlr.l %2\n\t"
32  "adds #1,%0\n\t"
33  "bcs 1b"
34  : "=r" (result)
35  : "0" (result),"r" (word));
36  return result;
37 }
38 
39 #define H8300_GEN_BITOP_CONST(OP,BIT) \
40  case BIT: \
41  __asm__(OP " #" #BIT ",@%0"::"r"(b_addr):"memory"); \
42  break;
43 
44 #define H8300_GEN_BITOP(FNAME,OP) \
45 static __inline__ void FNAME(int nr, volatile unsigned long* addr) \
46 { \
47  volatile unsigned char *b_addr; \
48  b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
49  if (__builtin_constant_p(nr)) { \
50  switch(nr & 7) { \
51  H8300_GEN_BITOP_CONST(OP,0) \
52  H8300_GEN_BITOP_CONST(OP,1) \
53  H8300_GEN_BITOP_CONST(OP,2) \
54  H8300_GEN_BITOP_CONST(OP,3) \
55  H8300_GEN_BITOP_CONST(OP,4) \
56  H8300_GEN_BITOP_CONST(OP,5) \
57  H8300_GEN_BITOP_CONST(OP,6) \
58  H8300_GEN_BITOP_CONST(OP,7) \
59  } \
60  } else { \
61  __asm__(OP " %w0,@%1"::"r"(nr),"r"(b_addr):"memory"); \
62  } \
63 }
64 
65 /*
66  * clear_bit() doesn't provide any barrier for the compiler.
67  */
68 #define smp_mb__before_clear_bit() barrier()
69 #define smp_mb__after_clear_bit() barrier()
70 
71 H8300_GEN_BITOP(set_bit ,"bset")
72 H8300_GEN_BITOP(clear_bit ,"bclr")
73 H8300_GEN_BITOP(change_bit,"bnot")
74 #define __set_bit(nr,addr) set_bit((nr),(addr))
75 #define __clear_bit(nr,addr) clear_bit((nr),(addr))
76 #define __change_bit(nr,addr) change_bit((nr),(addr))
77 
78 #undef H8300_GEN_BITOP
79 #undef H8300_GEN_BITOP_CONST
80 
81 static __inline__ int test_bit(int nr, const unsigned long* addr)
82 {
83  return (*((volatile unsigned char *)addr +
84  ((nr >> 3) ^ 3)) & (1UL << (nr & 7))) != 0;
85 }
86 
87 #define __test_bit(nr, addr) test_bit(nr, addr)
88 
89 #define H8300_GEN_TEST_BITOP_CONST_INT(OP,BIT) \
90  case BIT: \
91  __asm__("stc ccr,%w1\n\t" \
92  "orc #0x80,ccr\n\t" \
93  "bld #" #BIT ",@%4\n\t" \
94  OP " #" #BIT ",@%4\n\t" \
95  "rotxl.l %0\n\t" \
96  "ldc %w1,ccr" \
97  : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr) \
98  : "0" (retval),"r" (b_addr) \
99  : "memory"); \
100  break;
101 
102 #define H8300_GEN_TEST_BITOP_CONST(OP,BIT) \
103  case BIT: \
104  __asm__("bld #" #BIT ",@%3\n\t" \
105  OP " #" #BIT ",@%3\n\t" \
106  "rotxl.l %0\n\t" \
107  : "=r"(retval),"=m"(*b_addr) \
108  : "0" (retval),"r" (b_addr) \
109  : "memory"); \
110  break;
111 
112 #define H8300_GEN_TEST_BITOP(FNNAME,OP) \
113 static __inline__ int FNNAME(int nr, volatile void * addr) \
114 { \
115  int retval = 0; \
116  char ccrsave; \
117  volatile unsigned char *b_addr; \
118  b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
119  if (__builtin_constant_p(nr)) { \
120  switch(nr & 7) { \
121  H8300_GEN_TEST_BITOP_CONST_INT(OP,0) \
122  H8300_GEN_TEST_BITOP_CONST_INT(OP,1) \
123  H8300_GEN_TEST_BITOP_CONST_INT(OP,2) \
124  H8300_GEN_TEST_BITOP_CONST_INT(OP,3) \
125  H8300_GEN_TEST_BITOP_CONST_INT(OP,4) \
126  H8300_GEN_TEST_BITOP_CONST_INT(OP,5) \
127  H8300_GEN_TEST_BITOP_CONST_INT(OP,6) \
128  H8300_GEN_TEST_BITOP_CONST_INT(OP,7) \
129  } \
130  } else { \
131  __asm__("stc ccr,%w1\n\t" \
132  "orc #0x80,ccr\n\t" \
133  "btst %w5,@%4\n\t" \
134  OP " %w5,@%4\n\t" \
135  "beq 1f\n\t" \
136  "inc.l #1,%0\n" \
137  "1:\n\t" \
138  "ldc %w1,ccr" \
139  : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr) \
140  : "0" (retval),"r" (b_addr),"r"(nr) \
141  : "memory"); \
142  } \
143  return retval; \
144 } \
145  \
146 static __inline__ int __ ## FNNAME(int nr, volatile void * addr) \
147 { \
148  int retval = 0; \
149  volatile unsigned char *b_addr; \
150  b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
151  if (__builtin_constant_p(nr)) { \
152  switch(nr & 7) { \
153  H8300_GEN_TEST_BITOP_CONST(OP,0) \
154  H8300_GEN_TEST_BITOP_CONST(OP,1) \
155  H8300_GEN_TEST_BITOP_CONST(OP,2) \
156  H8300_GEN_TEST_BITOP_CONST(OP,3) \
157  H8300_GEN_TEST_BITOP_CONST(OP,4) \
158  H8300_GEN_TEST_BITOP_CONST(OP,5) \
159  H8300_GEN_TEST_BITOP_CONST(OP,6) \
160  H8300_GEN_TEST_BITOP_CONST(OP,7) \
161  } \
162  } else { \
163  __asm__("btst %w4,@%3\n\t" \
164  OP " %w4,@%3\n\t" \
165  "beq 1f\n\t" \
166  "inc.l #1,%0\n" \
167  "1:" \
168  : "=r"(retval),"=m"(*b_addr) \
169  : "0" (retval),"r" (b_addr),"r"(nr) \
170  : "memory"); \
171  } \
172  return retval; \
173 }
174 
175 H8300_GEN_TEST_BITOP(test_and_set_bit, "bset")
176 H8300_GEN_TEST_BITOP(test_and_clear_bit, "bclr")
177 H8300_GEN_TEST_BITOP(test_and_change_bit,"bnot")
178 #undef H8300_GEN_TEST_BITOP_CONST
179 #undef H8300_GEN_TEST_BITOP_CONST_INT
180 #undef H8300_GEN_TEST_BITOP
181 
182 #include <asm-generic/bitops/ffs.h>
183 
184 static __inline__ unsigned long __ffs(unsigned long word)
185 {
186  unsigned long result;
187 
188  result = -1;
189  __asm__("1:\n\t"
190  "shlr.l %2\n\t"
191  "adds #1,%0\n\t"
192  "bcc 1b"
193  : "=r" (result)
194  : "0"(result),"r"(word));
195  return result;
196 }
197 
198 #include <asm-generic/bitops/find.h>
199 #include <asm-generic/bitops/sched.h>
200 #include <asm-generic/bitops/hweight.h>
201 #include <asm-generic/bitops/lock.h>
202 #include <asm-generic/bitops/le.h>
203 #include <asm-generic/bitops/ext2-atomic.h>
204 
205 #endif /* __KERNEL__ */
206 
207 #include <asm-generic/bitops/fls.h>
208 #include <asm-generic/bitops/__fls.h>
209 #include <asm-generic/bitops/fls64.h>
210 
211 #endif /* _H8300_BITOPS_H */
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