summaryrefslogtreecommitdiff
path: root/include/asm-ppc/bitops.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-ppc/bitops.h')
-rw-r--r--include/asm-ppc/bitops.h387
1 files changed, 0 insertions, 387 deletions
diff --git a/include/asm-ppc/bitops.h b/include/asm-ppc/bitops.h
deleted file mode 100644
index adaf091..0000000
--- a/include/asm-ppc/bitops.h
+++ /dev/null
@@ -1,387 +0,0 @@
-/*
- * bitops.h: Bit string operations on the ppc
- */
-
-#ifndef _PPC_BITOPS_H
-#define _PPC_BITOPS_H
-
-#include <linux/config.h>
-#include <asm/byteorder.h>
-
-extern void set_bit(int nr, volatile void *addr);
-extern void clear_bit(int nr, volatile void *addr);
-extern void change_bit(int nr, volatile void *addr);
-extern int test_and_set_bit(int nr, volatile void *addr);
-extern int test_and_clear_bit(int nr, volatile void *addr);
-extern int test_and_change_bit(int nr, volatile void *addr);
-
-/*
- * Arguably these bit operations don't imply any memory barrier or
- * SMP ordering, but in fact a lot of drivers expect them to imply
- * both, since they do on x86 cpus.
- */
-#ifdef CONFIG_SMP
-#define SMP_WMB "eieio\n"
-#define SMP_MB "\nsync"
-#else
-#define SMP_WMB
-#define SMP_MB
-#endif /* CONFIG_SMP */
-
-#define __INLINE_BITOPS 1
-
-#if __INLINE_BITOPS
-/*
- * These used to be if'd out here because using : "cc" as a constraint
- * resulted in errors from egcs. Things may be OK with gcc-2.95.
- */
-extern __inline__ void set_bit(int nr, volatile void * addr)
-{
- unsigned long old;
- unsigned long mask = 1 << (nr & 0x1f);
- unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-
- __asm__ __volatile__(SMP_WMB "\
-1: lwarx %0,0,%3\n\
- or %0,%0,%2\n\
- stwcx. %0,0,%3\n\
- bne 1b"
- SMP_MB
- : "=&r" (old), "=m" (*p)
- : "r" (mask), "r" (p), "m" (*p)
- : "cc" );
-}
-
-extern __inline__ void clear_bit(int nr, volatile void *addr)
-{
- unsigned long old;
- unsigned long mask = 1 << (nr & 0x1f);
- unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-
- __asm__ __volatile__(SMP_WMB "\
-1: lwarx %0,0,%3\n\
- andc %0,%0,%2\n\
- stwcx. %0,0,%3\n\
- bne 1b"
- SMP_MB
- : "=&r" (old), "=m" (*p)
- : "r" (mask), "r" (p), "m" (*p)
- : "cc");
-}
-
-extern __inline__ void change_bit(int nr, volatile void *addr)
-{
- unsigned long old;
- unsigned long mask = 1 << (nr & 0x1f);
- unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-
- __asm__ __volatile__(SMP_WMB "\
-1: lwarx %0,0,%3\n\
- xor %0,%0,%2\n\
- stwcx. %0,0,%3\n\
- bne 1b"
- SMP_MB
- : "=&r" (old), "=m" (*p)
- : "r" (mask), "r" (p), "m" (*p)
- : "cc");
-}
-
-extern __inline__ int test_and_set_bit(int nr, volatile void *addr)
-{
- unsigned int old, t;
- unsigned int mask = 1 << (nr & 0x1f);
- volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
-
- __asm__ __volatile__(SMP_WMB "\
-1: lwarx %0,0,%4\n\
- or %1,%0,%3\n\
- stwcx. %1,0,%4\n\
- bne 1b"
- SMP_MB
- : "=&r" (old), "=&r" (t), "=m" (*p)
- : "r" (mask), "r" (p), "m" (*p)
- : "cc");
-
- return (old & mask) != 0;
-}
-
-extern __inline__ int test_and_clear_bit(int nr, volatile void *addr)
-{
- unsigned int old, t;
- unsigned int mask = 1 << (nr & 0x1f);
- volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
-
- __asm__ __volatile__(SMP_WMB "\
-1: lwarx %0,0,%4\n\
- andc %1,%0,%3\n\
- stwcx. %1,0,%4\n\
- bne 1b"
- SMP_MB
- : "=&r" (old), "=&r" (t), "=m" (*p)
- : "r" (mask), "r" (p), "m" (*p)
- : "cc");
-
- return (old & mask) != 0;
-}
-
-extern __inline__ int test_and_change_bit(int nr, volatile void *addr)
-{
- unsigned int old, t;
- unsigned int mask = 1 << (nr & 0x1f);
- volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
-
- __asm__ __volatile__(SMP_WMB "\
-1: lwarx %0,0,%4\n\
- xor %1,%0,%3\n\
- stwcx. %1,0,%4\n\
- bne 1b"
- SMP_MB
- : "=&r" (old), "=&r" (t), "=m" (*p)
- : "r" (mask), "r" (p), "m" (*p)
- : "cc");
-
- return (old & mask) != 0;
-}
-#endif /* __INLINE_BITOPS */
-
-extern __inline__ int test_bit(int nr, __const__ volatile void *addr)
-{
- __const__ unsigned int *p = (__const__ unsigned int *) addr;
-
- return ((p[nr >> 5] >> (nr & 0x1f)) & 1) != 0;
-}
-
-/* Return the bit position of the most significant 1 bit in a word */
-/* - the result is undefined when x == 0 */
-extern __inline__ int __ilog2(unsigned int x)
-{
- int lz;
-
- asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
- return 31 - lz;
-}
-
-extern __inline__ int ffz(unsigned int x)
-{
- if ((x = ~x) == 0)
- return 32;
- return __ilog2(x & -x);
-}
-
-/*
- * fls: find last (most-significant) bit set.
- * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
- *
- * On powerpc, __ilog2(0) returns -1, but this is not safe in general
- */
-static __inline__ int fls(unsigned int x)
-{
- return __ilog2(x) + 1;
-}
-#define PLATFORM_FLS
-
-/**
- * fls64 - find last set bit in a 64-bit word
- * @x: the word to search
- *
- * This is defined in a similar way as the libc and compiler builtin
- * ffsll, but returns the position of the most significant set bit.
- *
- * fls64(value) returns 0 if value is 0 or the position of the last
- * set bit if value is nonzero. The last (most significant) bit is
- * at position 64.
- */
-#if BITS_PER_LONG == 32
-static inline int fls64(__u64 x)
-{
- __u32 h = x >> 32;
- if (h)
- return fls(h) + 32;
- return fls(x);
-}
-#elif BITS_PER_LONG == 64
-static inline int fls64(__u64 x)
-{
- if (x == 0)
- return 0;
- return __ilog2(x) + 1;
-}
-#else
-#error BITS_PER_LONG not 32 or 64
-#endif
-
-static inline int __ilog2_u64(u64 n)
-{
- return fls64(n) - 1;
-}
-
-static inline int ffs64(u64 x)
-{
- return __ilog2_u64(x & -x) + 1ull;
-}
-
-#ifdef __KERNEL__
-
-/*
- * ffs: find first bit set. This is defined the same way as
- * the libc and compiler builtin ffs routines, therefore
- * differs in spirit from the above ffz (man ffs).
- */
-extern __inline__ int ffs(int x)
-{
- return __ilog2(x & -x) + 1;
-}
-#define PLATFORM_FFS
-
-/*
- * hweightN: returns the hamming weight (i.e. the number
- * of bits set) of a N-bit word
- */
-
-#define hweight32(x) generic_hweight32(x)
-#define hweight16(x) generic_hweight16(x)
-#define hweight8(x) generic_hweight8(x)
-
-#endif /* __KERNEL__ */
-
-/*
- * This implementation of find_{first,next}_zero_bit was stolen from
- * Linus' asm-alpha/bitops.h.
- */
-#define find_first_zero_bit(addr, size) \
- find_next_zero_bit((addr), (size), 0)
-
-extern __inline__ unsigned long find_next_zero_bit(void * addr,
- unsigned long size, unsigned long offset)
-{
- unsigned int * p = ((unsigned int *) addr) + (offset >> 5);
- unsigned int result = offset & ~31UL;
- unsigned int tmp;
-
- if (offset >= size)
- return size;
- size -= result;
- offset &= 31UL;
- if (offset) {
- tmp = *p++;
- tmp |= ~0UL >> (32-offset);
- if (size < 32)
- goto found_first;
- if (tmp != ~0U)
- goto found_middle;
- size -= 32;
- result += 32;
- }
- while (size >= 32) {
- if ((tmp = *p++) != ~0U)
- goto found_middle;
- result += 32;
- size -= 32;
- }
- if (!size)
- return result;
- tmp = *p;
-found_first:
- tmp |= ~0UL << size;
-found_middle:
- return result + ffz(tmp);
-}
-
-
-#define _EXT2_HAVE_ASM_BITOPS_
-
-#ifdef __KERNEL__
-/*
- * test_and_{set,clear}_bit guarantee atomicity without
- * disabling interrupts.
- */
-#define ext2_set_bit(nr, addr) test_and_set_bit((nr) ^ 0x18, addr)
-#define ext2_clear_bit(nr, addr) test_and_clear_bit((nr) ^ 0x18, addr)
-
-#else
-extern __inline__ int ext2_set_bit(int nr, void * addr)
-{
- int mask;
- unsigned char *ADDR = (unsigned char *) addr;
- int oldbit;
-
- ADDR += nr >> 3;
- mask = 1 << (nr & 0x07);
- oldbit = (*ADDR & mask) ? 1 : 0;
- *ADDR |= mask;
- return oldbit;
-}
-
-extern __inline__ int ext2_clear_bit(int nr, void * addr)
-{
- int mask;
- unsigned char *ADDR = (unsigned char *) addr;
- int oldbit;
-
- ADDR += nr >> 3;
- mask = 1 << (nr & 0x07);
- oldbit = (*ADDR & mask) ? 1 : 0;
- *ADDR = *ADDR & ~mask;
- return oldbit;
-}
-#endif /* __KERNEL__ */
-
-extern __inline__ int ext2_test_bit(int nr, __const__ void * addr)
-{
- __const__ unsigned char *ADDR = (__const__ unsigned char *) addr;
-
- return (ADDR[nr >> 3] >> (nr & 7)) & 1;
-}
-
-/*
- * This implementation of ext2_find_{first,next}_zero_bit was stolen from
- * Linus' asm-alpha/bitops.h and modified for a big-endian machine.
- */
-
-#define ext2_find_first_zero_bit(addr, size) \
- ext2_find_next_zero_bit((addr), (size), 0)
-
-static __inline__ unsigned long ext2_find_next_zero_bit(void *addr,
- unsigned long size, unsigned long offset)
-{
- unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
- unsigned int result = offset & ~31UL;
- unsigned int tmp;
-
- if (offset >= size)
- return size;
- size -= result;
- offset &= 31UL;
- if (offset) {
- tmp = cpu_to_le32p(p++);
- tmp |= ~0UL >> (32-offset);
- if (size < 32)
- goto found_first;
- if (tmp != ~0U)
- goto found_middle;
- size -= 32;
- result += 32;
- }
- while (size >= 32) {
- if ((tmp = cpu_to_le32p(p++)) != ~0U)
- goto found_middle;
- result += 32;
- size -= 32;
- }
- if (!size)
- return result;
- tmp = cpu_to_le32p(p);
-found_first:
- tmp |= ~0U << size;
-found_middle:
- return result + ffz(tmp);
-}
-
-/* Bitmap functions for the minix filesystem. */
-#define minix_test_and_set_bit(nr,addr) ext2_set_bit(nr,addr)
-#define minix_set_bit(nr,addr) ((void)ext2_set_bit(nr,addr))
-#define minix_test_and_clear_bit(nr,addr) ext2_clear_bit(nr,addr)
-#define minix_test_bit(nr,addr) ext2_test_bit(nr,addr)
-#define minix_find_first_zero_bit(addr,size) ext2_find_first_zero_bit(addr,size)
-
-#endif /* _PPC_BITOPS_H */