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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-ppc/] [bitops.h] - Blame information for rev 1765

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#ifndef _ASM_PPC_BITOPS_H_
#define _ASM_PPC_BITOPS_H_
 
/*
 * For the benefit of those who are trying to port Linux to another
 * architecture, here are some C-language equivalents.  You should
 * recode these in the native assembly language, if at all possible.
 * To guarantee atomicity, these routines call cli() and sti() to
 * disable interrupts while they operate.  (You have to provide inline
 * routines to cli() and sti().)
 *
 * Also note, these routines assume that you have 32 bit integers.
 * You will have to change this if you are trying to port Linux to the
 * Alpha architecture or to a Cray.  :-)
 *
 * C language equivalents written by Theodore Ts'o, 9/26/92
 */
 
#include "asm/system.h"  /* For cli/sti declaration */
 
#define BIT(n) 1<<(n&0x1F)
typedef unsigned long BITFIELD;
 
extern __inline__ int set_bit(int nr, void * add)
{
       int      mask, oldbit;
  BITFIELD *addr = add;
 
        int s = _disable_interrupts();
        addr += nr >> 5;
        mask = BIT(nr);
        oldbit = (mask & *addr) != 0;
        *addr |= mask;
        _enable_interrupts(s);
 
 
        return oldbit;
}
 
extern __inline__ int change_bit(int nr, void *add)
{
        BITFIELD *addr = add;
        int     mask, retval;
        int s = _disable_interrupts();
        addr += nr >> 5;
        mask = BIT(nr);
        retval = (mask & *addr) != 0;
        *addr ^= mask;
        _enable_interrupts(s);
        return retval;
}
 
extern __inline__ int clear_bit(int nr, void *add)
{
        BITFIELD *addr = add;
        int     mask, retval;
        int s = _disable_interrupts();
        addr += nr >> 5;
        mask = BIT(nr);
        retval = (mask & *addr) != 0;
        *addr &= ~mask;
        _enable_interrupts(s);
        return retval;
}
 
extern __inline__ int test_bit(int nr, void *add)
{
        int     mask;
        BITFIELD *addr = add;
 
        addr += nr >> 5;
        mask = BIT(nr);
        return ((mask & *addr) != 0);
}
#if 0
extern __inline__ int find_first_zero_bit(void *add, int len)
{
        int     mask, nr, i;
        BITFIELD *addr = add;
        nr = 0;
        while (len)
        {
                if (~*addr != 0)
                { /* Contains at least one zero */
                        for (i = 0;  i < 32;  i++, nr++)
                        {
                                mask = BIT(nr);
                                if ((mask & *addr) == 0)
                                {
                                        return (nr);
                                }
                        }
                }
                len -= 32;
                addr++;
                nr += 32;
        }
        return (0);  /* Shouldn't happen */
}
 
extern __inline__ int find_next_zero_bit(void *add, int len, int nr)
{
        int     mask, i;
        BITFIELD *addr = add;
        addr += nr >> 5;
        len -= nr;
        while (len)
        {
                if (*addr != 0xFFFFFFFF)
                { /* Contains at least one zero */
                        for (i = 0;  i < 32;  i++, nr++)
                        {
                                mask = BIT(nr);
                                if ((mask & *addr) == 0)
                                {
printk("Bit: %d(%d), Pat: %x\n", nr, nr&0x1F, *addr);
                                        return (nr);
                                }
                        }
                }
                len -= 32;
                addr++;
                nr += 32;
        }
        return (0);  /* Shouldn't happen */
}
#endif
#endif /* _ASM_PPC_BITOPS_H */
 
 

Line No.	Rev	Author	Line
1	1633	jcastillo	`#ifndef _ASM_PPC_BITOPS_H_`
2			`#define _ASM_PPC_BITOPS_H_`
3
4			`/*`
5			`* For the benefit of those who are trying to port Linux to another`
6			`* architecture, here are some C-language equivalents. You should`
7			`* recode these in the native assembly language, if at all possible.`
8			`* To guarantee atomicity, these routines call cli() and sti() to`
9			`* disable interrupts while they operate. (You have to provide inline`
10			`* routines to cli() and sti().)`
11			`*`
12			`* Also note, these routines assume that you have 32 bit integers.`
13			`* You will have to change this if you are trying to port Linux to the`
14			`* Alpha architecture or to a Cray. :-)`
15			`*`
16			`* C language equivalents written by Theodore Ts'o, 9/26/92`
17			`*/`
18
19			`#include "asm/system.h" /* For cli/sti declaration */`
20
21			`#define BIT(n) 1<<(n&0x1F)`
22			`typedef unsigned long BITFIELD;`
23
24			`extern __inline__ int set_bit(int nr, void * add)`
25			`{`
26			`int mask, oldbit;`
27			`BITFIELD *addr = add;`
28
29			`int s = _disable_interrupts();`
30			`addr += nr >> 5;`
31			`mask = BIT(nr);`
32			`oldbit = (mask & *addr) != 0;`
33			`*addr \|= mask;`
34			`_enable_interrupts(s);`
35
36
37			`return oldbit;`
38			`}`
39
40			`extern __inline__ int change_bit(int nr, void *add)`
41			`{`
42			`BITFIELD *addr = add;`
43			`int mask, retval;`
44			`int s = _disable_interrupts();`
45			`addr += nr >> 5;`
46			`mask = BIT(nr);`
47			`retval = (mask & *addr) != 0;`
48			`*addr ^= mask;`
49			`_enable_interrupts(s);`
50			`return retval;`
51			`}`
52
53			`extern __inline__ int clear_bit(int nr, void *add)`
54			`{`
55			`BITFIELD *addr = add;`
56			`int mask, retval;`
57			`int s = _disable_interrupts();`
58			`addr += nr >> 5;`
59			`mask = BIT(nr);`
60			`retval = (mask & *addr) != 0;`
61			`*addr &= ~mask;`
62			`_enable_interrupts(s);`
63			`return retval;`
64			`}`
65
66			`extern __inline__ int test_bit(int nr, void *add)`
67			`{`
68			`int mask;`
69			`BITFIELD *addr = add;`
70
71			`addr += nr >> 5;`
72			`mask = BIT(nr);`
73			`return ((mask & *addr) != 0);`
74			`}`
75			`#if 0`
76			`extern __inline__ int find_first_zero_bit(void *add, int len)`
77			`{`
78			`int mask, nr, i;`
79			`BITFIELD *addr = add;`
80			`nr = 0;`
81			`while (len)`
82			`{`
83			`if (~*addr != 0)`
84			`{ /* Contains at least one zero */`
85			`for (i = 0; i < 32; i++, nr++)`
86			`{`
87			`mask = BIT(nr);`
88			`if ((mask & *addr) == 0)`
89			`{`
90			`return (nr);`
91			`}`
92			`}`
93			`}`
94			`len -= 32;`
95			`addr++;`
96			`nr += 32;`
97			`}`
98			`return (0); /* Shouldn't happen */`
99			`}`
100
101			`extern __inline__ int find_next_zero_bit(void *add, int len, int nr)`
102			`{`
103			`int mask, i;`
104			`BITFIELD *addr = add;`
105			`addr += nr >> 5;`
106			`len -= nr;`
107			`while (len)`
108			`{`
109			`if (*addr != 0xFFFFFFFF)`
110			`{ /* Contains at least one zero */`
111			`for (i = 0; i < 32; i++, nr++)`
112			`{`
113			`mask = BIT(nr);`
114			`if ((mask & *addr) == 0)`
115			`{`
116			`printk("Bit: %d(%d), Pat: %x\n", nr, nr&0x1F, *addr);`
117			`return (nr);`
118			`}`
119			`}`
120			`}`
121			`len -= 32;`
122			`addr++;`
123			`nr += 32;`
124			`}`
125			`return (0); /* Shouldn't happen */`
126			`}`
127			`#endif`
128			`#endif /* _ASM_PPC_BITOPS_H */`
129
130

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [asm-ppc/] [bitops.h] - Blame information for rev 1765