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Diffstat (limited to 'include/asm-s390/bitops.h')
-rw-r--r--include/asm-s390/bitops.h884
1 files changed, 0 insertions, 884 deletions
diff --git a/include/asm-s390/bitops.h b/include/asm-s390/bitops.h
deleted file mode 100644
index b4eb24ab5af9..000000000000
--- a/include/asm-s390/bitops.h
+++ /dev/null
@@ -1,884 +0,0 @@
-#ifndef _S390_BITOPS_H
-#define _S390_BITOPS_H
-
-/*
- * include/asm-s390/bitops.h
- *
- * S390 version
- * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
- *
- * Derived from "include/asm-i386/bitops.h"
- * Copyright (C) 1992, Linus Torvalds
- *
- */
-
-#ifdef __KERNEL__
-
-#ifndef _LINUX_BITOPS_H
-#error only <linux/bitops.h> can be included directly
-#endif
-
-#include <linux/compiler.h>
-
-/*
- * 32 bit bitops format:
- * bit 0 is the LSB of *addr; bit 31 is the MSB of *addr;
- * bit 32 is the LSB of *(addr+4). That combined with the
- * big endian byte order on S390 give the following bit
- * order in memory:
- * 1f 1e 1d 1c 1b 1a 19 18 17 16 15 14 13 12 11 10 \
- * 0f 0e 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00
- * after that follows the next long with bit numbers
- * 3f 3e 3d 3c 3b 3a 39 38 37 36 35 34 33 32 31 30
- * 2f 2e 2d 2c 2b 2a 29 28 27 26 25 24 23 22 21 20
- * The reason for this bit ordering is the fact that
- * in the architecture independent code bits operations
- * of the form "flags |= (1 << bitnr)" are used INTERMIXED
- * with operation of the form "set_bit(bitnr, flags)".
- *
- * 64 bit bitops format:
- * bit 0 is the LSB of *addr; bit 63 is the MSB of *addr;
- * bit 64 is the LSB of *(addr+8). That combined with the
- * big endian byte order on S390 give the following bit
- * order in memory:
- * 3f 3e 3d 3c 3b 3a 39 38 37 36 35 34 33 32 31 30
- * 2f 2e 2d 2c 2b 2a 29 28 27 26 25 24 23 22 21 20
- * 1f 1e 1d 1c 1b 1a 19 18 17 16 15 14 13 12 11 10
- * 0f 0e 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00
- * after that follows the next long with bit numbers
- * 7f 7e 7d 7c 7b 7a 79 78 77 76 75 74 73 72 71 70
- * 6f 6e 6d 6c 6b 6a 69 68 67 66 65 64 63 62 61 60
- * 5f 5e 5d 5c 5b 5a 59 58 57 56 55 54 53 52 51 50
- * 4f 4e 4d 4c 4b 4a 49 48 47 46 45 44 43 42 41 40
- * The reason for this bit ordering is the fact that
- * in the architecture independent code bits operations
- * of the form "flags |= (1 << bitnr)" are used INTERMIXED
- * with operation of the form "set_bit(bitnr, flags)".
- */
-
-/* bitmap tables from arch/S390/kernel/bitmap.S */
-extern const char _oi_bitmap[];
-extern const char _ni_bitmap[];
-extern const char _zb_findmap[];
-extern const char _sb_findmap[];
-
-#ifndef __s390x__
-
-#define __BITOPS_ALIGN 3
-#define __BITOPS_WORDSIZE 32
-#define __BITOPS_OR "or"
-#define __BITOPS_AND "nr"
-#define __BITOPS_XOR "xr"
-
-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
-
-#define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
- asm volatile( \
- " l %0,%2\n" \
- "0: lr %1,%0\n" \
- __op_string " %1,%3\n" \
- " cs %0,%1,%2\n" \
- " jl 0b" \
- : "=&d" (__old), "=&d" (__new), \
- "=Q" (*(unsigned long *) __addr) \
- : "d" (__val), "Q" (*(unsigned long *) __addr) \
- : "cc");
-
-#else /* __GNUC__ */
-
-#define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
- asm volatile( \
- " l %0,0(%4)\n" \
- "0: lr %1,%0\n" \
- __op_string " %1,%3\n" \
- " cs %0,%1,0(%4)\n" \
- " jl 0b" \
- : "=&d" (__old), "=&d" (__new), \
- "=m" (*(unsigned long *) __addr) \
- : "d" (__val), "a" (__addr), \
- "m" (*(unsigned long *) __addr) : "cc");
-
-#endif /* __GNUC__ */
-
-#else /* __s390x__ */
-
-#define __BITOPS_ALIGN 7
-#define __BITOPS_WORDSIZE 64
-#define __BITOPS_OR "ogr"
-#define __BITOPS_AND "ngr"
-#define __BITOPS_XOR "xgr"
-
-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
-
-#define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
- asm volatile( \
- " lg %0,%2\n" \
- "0: lgr %1,%0\n" \
- __op_string " %1,%3\n" \
- " csg %0,%1,%2\n" \
- " jl 0b" \
- : "=&d" (__old), "=&d" (__new), \
- "=Q" (*(unsigned long *) __addr) \
- : "d" (__val), "Q" (*(unsigned long *) __addr) \
- : "cc");
-
-#else /* __GNUC__ */
-
-#define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
- asm volatile( \
- " lg %0,0(%4)\n" \
- "0: lgr %1,%0\n" \
- __op_string " %1,%3\n" \
- " csg %0,%1,0(%4)\n" \
- " jl 0b" \
- : "=&d" (__old), "=&d" (__new), \
- "=m" (*(unsigned long *) __addr) \
- : "d" (__val), "a" (__addr), \
- "m" (*(unsigned long *) __addr) : "cc");
-
-
-#endif /* __GNUC__ */
-
-#endif /* __s390x__ */
-
-#define __BITOPS_WORDS(bits) (((bits)+__BITOPS_WORDSIZE-1)/__BITOPS_WORDSIZE)
-#define __BITOPS_BARRIER() asm volatile("" : : : "memory")
-
-#ifdef CONFIG_SMP
-/*
- * SMP safe set_bit routine based on compare and swap (CS)
- */
-static inline void set_bit_cs(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr, old, new, mask;
-
- addr = (unsigned long) ptr;
- /* calculate address for CS */
- addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
- /* make OR mask */
- mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
- /* Do the atomic update. */
- __BITOPS_LOOP(old, new, addr, mask, __BITOPS_OR);
-}
-
-/*
- * SMP safe clear_bit routine based on compare and swap (CS)
- */
-static inline void clear_bit_cs(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr, old, new, mask;
-
- addr = (unsigned long) ptr;
- /* calculate address for CS */
- addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
- /* make AND mask */
- mask = ~(1UL << (nr & (__BITOPS_WORDSIZE - 1)));
- /* Do the atomic update. */
- __BITOPS_LOOP(old, new, addr, mask, __BITOPS_AND);
-}
-
-/*
- * SMP safe change_bit routine based on compare and swap (CS)
- */
-static inline void change_bit_cs(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr, old, new, mask;
-
- addr = (unsigned long) ptr;
- /* calculate address for CS */
- addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
- /* make XOR mask */
- mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
- /* Do the atomic update. */
- __BITOPS_LOOP(old, new, addr, mask, __BITOPS_XOR);
-}
-
-/*
- * SMP safe test_and_set_bit routine based on compare and swap (CS)
- */
-static inline int
-test_and_set_bit_cs(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr, old, new, mask;
-
- addr = (unsigned long) ptr;
- /* calculate address for CS */
- addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
- /* make OR/test mask */
- mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
- /* Do the atomic update. */
- __BITOPS_LOOP(old, new, addr, mask, __BITOPS_OR);
- __BITOPS_BARRIER();
- return (old & mask) != 0;
-}
-
-/*
- * SMP safe test_and_clear_bit routine based on compare and swap (CS)
- */
-static inline int
-test_and_clear_bit_cs(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr, old, new, mask;
-
- addr = (unsigned long) ptr;
- /* calculate address for CS */
- addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
- /* make AND/test mask */
- mask = ~(1UL << (nr & (__BITOPS_WORDSIZE - 1)));
- /* Do the atomic update. */
- __BITOPS_LOOP(old, new, addr, mask, __BITOPS_AND);
- __BITOPS_BARRIER();
- return (old ^ new) != 0;
-}
-
-/*
- * SMP safe test_and_change_bit routine based on compare and swap (CS)
- */
-static inline int
-test_and_change_bit_cs(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr, old, new, mask;
-
- addr = (unsigned long) ptr;
- /* calculate address for CS */
- addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
- /* make XOR/test mask */
- mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
- /* Do the atomic update. */
- __BITOPS_LOOP(old, new, addr, mask, __BITOPS_XOR);
- __BITOPS_BARRIER();
- return (old & mask) != 0;
-}
-#endif /* CONFIG_SMP */
-
-/*
- * fast, non-SMP set_bit routine
- */
-static inline void __set_bit(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr;
-
- addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
- asm volatile(
- " oc 0(1,%1),0(%2)"
- : "=m" (*(char *) addr) : "a" (addr),
- "a" (_oi_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc" );
-}
-
-static inline void
-__constant_set_bit(const unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr;
-
- addr = ((unsigned long) ptr) + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
- *(unsigned char *) addr |= 1 << (nr & 7);
-}
-
-#define set_bit_simple(nr,addr) \
-(__builtin_constant_p((nr)) ? \
- __constant_set_bit((nr),(addr)) : \
- __set_bit((nr),(addr)) )
-
-/*
- * fast, non-SMP clear_bit routine
- */
-static inline void
-__clear_bit(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr;
-
- addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
- asm volatile(
- " nc 0(1,%1),0(%2)"
- : "=m" (*(char *) addr) : "a" (addr),
- "a" (_ni_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc");
-}
-
-static inline void
-__constant_clear_bit(const unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr;
-
- addr = ((unsigned long) ptr) + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
- *(unsigned char *) addr &= ~(1 << (nr & 7));
-}
-
-#define clear_bit_simple(nr,addr) \
-(__builtin_constant_p((nr)) ? \
- __constant_clear_bit((nr),(addr)) : \
- __clear_bit((nr),(addr)) )
-
-/*
- * fast, non-SMP change_bit routine
- */
-static inline void __change_bit(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr;
-
- addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
- asm volatile(
- " xc 0(1,%1),0(%2)"
- : "=m" (*(char *) addr) : "a" (addr),
- "a" (_oi_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc" );
-}
-
-static inline void
-__constant_change_bit(const unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr;
-
- addr = ((unsigned long) ptr) + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
- *(unsigned char *) addr ^= 1 << (nr & 7);
-}
-
-#define change_bit_simple(nr,addr) \
-(__builtin_constant_p((nr)) ? \
- __constant_change_bit((nr),(addr)) : \
- __change_bit((nr),(addr)) )
-
-/*
- * fast, non-SMP test_and_set_bit routine
- */
-static inline int
-test_and_set_bit_simple(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr;
- unsigned char ch;
-
- addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
- ch = *(unsigned char *) addr;
- asm volatile(
- " oc 0(1,%1),0(%2)"
- : "=m" (*(char *) addr)
- : "a" (addr), "a" (_oi_bitmap + (nr & 7)),
- "m" (*(char *) addr) : "cc", "memory");
- return (ch >> (nr & 7)) & 1;
-}
-#define __test_and_set_bit(X,Y) test_and_set_bit_simple(X,Y)
-
-/*
- * fast, non-SMP test_and_clear_bit routine
- */
-static inline int
-test_and_clear_bit_simple(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr;
- unsigned char ch;
-
- addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
- ch = *(unsigned char *) addr;
- asm volatile(
- " nc 0(1,%1),0(%2)"
- : "=m" (*(char *) addr)
- : "a" (addr), "a" (_ni_bitmap + (nr & 7)),
- "m" (*(char *) addr) : "cc", "memory");
- return (ch >> (nr & 7)) & 1;
-}
-#define __test_and_clear_bit(X,Y) test_and_clear_bit_simple(X,Y)
-
-/*
- * fast, non-SMP test_and_change_bit routine
- */
-static inline int
-test_and_change_bit_simple(unsigned long nr, volatile unsigned long *ptr)
-{
- unsigned long addr;
- unsigned char ch;
-
- addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
- ch = *(unsigned char *) addr;
- asm volatile(
- " xc 0(1,%1),0(%2)"
- : "=m" (*(char *) addr)
- : "a" (addr), "a" (_oi_bitmap + (nr & 7)),
- "m" (*(char *) addr) : "cc", "memory");
- return (ch >> (nr & 7)) & 1;
-}
-#define __test_and_change_bit(X,Y) test_and_change_bit_simple(X,Y)
-
-#ifdef CONFIG_SMP
-#define set_bit set_bit_cs
-#define clear_bit clear_bit_cs
-#define change_bit change_bit_cs
-#define test_and_set_bit test_and_set_bit_cs
-#define test_and_clear_bit test_and_clear_bit_cs
-#define test_and_change_bit test_and_change_bit_cs
-#else
-#define set_bit set_bit_simple
-#define clear_bit clear_bit_simple
-#define change_bit change_bit_simple
-#define test_and_set_bit test_and_set_bit_simple
-#define test_and_clear_bit test_and_clear_bit_simple
-#define test_and_change_bit test_and_change_bit_simple
-#endif
-
-
-/*
- * This routine doesn't need to be atomic.
- */
-
-static inline int __test_bit(unsigned long nr, const volatile unsigned long *ptr)
-{
- unsigned long addr;
- unsigned char ch;
-
- addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
- ch = *(volatile unsigned char *) addr;
- return (ch >> (nr & 7)) & 1;
-}
-
-static inline int
-__constant_test_bit(unsigned long nr, const volatile unsigned long *addr) {
- return (((volatile char *) addr)
- [(nr^(__BITOPS_WORDSIZE-8))>>3] & (1<<(nr&7))) != 0;
-}
-
-#define test_bit(nr,addr) \
-(__builtin_constant_p((nr)) ? \
- __constant_test_bit((nr),(addr)) : \
- __test_bit((nr),(addr)) )
-
-/*
- * Optimized find bit helper functions.
- */
-
-/**
- * __ffz_word_loop - find byte offset of first long != -1UL
- * @addr: pointer to array of unsigned long
- * @size: size of the array in bits
- */
-static inline unsigned long __ffz_word_loop(const unsigned long *addr,
- unsigned long size)
-{
- typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
- unsigned long bytes = 0;
-
- asm volatile(
-#ifndef __s390x__
- " ahi %1,-1\n"
- " sra %1,5\n"
- " jz 1f\n"
- "0: c %2,0(%0,%3)\n"
- " jne 1f\n"
- " la %0,4(%0)\n"
- " brct %1,0b\n"
- "1:\n"
-#else
- " aghi %1,-1\n"
- " srag %1,%1,6\n"
- " jz 1f\n"
- "0: cg %2,0(%0,%3)\n"
- " jne 1f\n"
- " la %0,8(%0)\n"
- " brct %1,0b\n"
- "1:\n"
-#endif
- : "+&a" (bytes), "+&d" (size)
- : "d" (-1UL), "a" (addr), "m" (*(addrtype *) addr)
- : "cc" );
- return bytes;
-}
-
-/**
- * __ffs_word_loop - find byte offset of first long != 0UL
- * @addr: pointer to array of unsigned long
- * @size: size of the array in bits
- */
-static inline unsigned long __ffs_word_loop(const unsigned long *addr,
- unsigned long size)
-{
- typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
- unsigned long bytes = 0;
-
- asm volatile(
-#ifndef __s390x__
- " ahi %1,-1\n"
- " sra %1,5\n"
- " jz 1f\n"
- "0: c %2,0(%0,%3)\n"
- " jne 1f\n"
- " la %0,4(%0)\n"
- " brct %1,0b\n"
- "1:\n"
-#else
- " aghi %1,-1\n"
- " srag %1,%1,6\n"
- " jz 1f\n"
- "0: cg %2,0(%0,%3)\n"
- " jne 1f\n"
- " la %0,8(%0)\n"
- " brct %1,0b\n"
- "1:\n"
-#endif
- : "+&a" (bytes), "+&a" (size)
- : "d" (0UL), "a" (addr), "m" (*(addrtype *) addr)
- : "cc" );
- return bytes;
-}
-
-/**
- * __ffz_word - add number of the first unset bit
- * @nr: base value the bit number is added to
- * @word: the word that is searched for unset bits
- */
-static inline unsigned long __ffz_word(unsigned long nr, unsigned long word)
-{
-#ifdef __s390x__
- if (likely((word & 0xffffffff) == 0xffffffff)) {
- word >>= 32;
- nr += 32;
- }
-#endif
- if (likely((word & 0xffff) == 0xffff)) {
- word >>= 16;
- nr += 16;
- }
- if (likely((word & 0xff) == 0xff)) {
- word >>= 8;
- nr += 8;
- }
- return nr + _zb_findmap[(unsigned char) word];
-}
-
-/**
- * __ffs_word - add number of the first set bit
- * @nr: base value the bit number is added to
- * @word: the word that is searched for set bits
- */
-static inline unsigned long __ffs_word(unsigned long nr, unsigned long word)
-{
-#ifdef __s390x__
- if (likely((word & 0xffffffff) == 0)) {
- word >>= 32;
- nr += 32;
- }
-#endif
- if (likely((word & 0xffff) == 0)) {
- word >>= 16;
- nr += 16;
- }
- if (likely((word & 0xff) == 0)) {
- word >>= 8;
- nr += 8;
- }
- return nr + _sb_findmap[(unsigned char) word];
-}
-
-
-/**
- * __load_ulong_be - load big endian unsigned long
- * @p: pointer to array of unsigned long
- * @offset: byte offset of source value in the array
- */
-static inline unsigned long __load_ulong_be(const unsigned long *p,
- unsigned long offset)
-{
- p = (unsigned long *)((unsigned long) p + offset);
- return *p;
-}
-
-/**
- * __load_ulong_le - load little endian unsigned long
- * @p: pointer to array of unsigned long
- * @offset: byte offset of source value in the array
- */
-static inline unsigned long __load_ulong_le(const unsigned long *p,
- unsigned long offset)
-{
- unsigned long word;
-
- p = (unsigned long *)((unsigned long) p + offset);
-#ifndef __s390x__
- asm volatile(
- " ic %0,0(%1)\n"
- " icm %0,2,1(%1)\n"
- " icm %0,4,2(%1)\n"
- " icm %0,8,3(%1)"
- : "=&d" (word) : "a" (p), "m" (*p) : "cc");
-#else
- asm volatile(
- " lrvg %0,%1"
- : "=d" (word) : "m" (*p) );
-#endif
- return word;
-}
-
-/*
- * The various find bit functions.
- */
-
-/*
- * ffz - find first zero in word.
- * @word: The word to search
- *
- * Undefined if no zero exists, so code should check against ~0UL first.
- */
-static inline unsigned long ffz(unsigned long word)
-{
- return __ffz_word(0, word);
-}
-
-/**
- * __ffs - find first bit in word.
- * @word: The word to search
- *
- * Undefined if no bit exists, so code should check against 0 first.
- */
-static inline unsigned long __ffs (unsigned long word)
-{
- return __ffs_word(0, word);
-}
-
-/**
- * ffs - find first bit set
- * @x: the word to search
- *
- * This is defined the same way as
- * the libc and compiler builtin ffs routines, therefore
- * differs in spirit from the above ffz (man ffs).
- */
-static inline int ffs(int x)
-{
- if (!x)
- return 0;
- return __ffs_word(1, x);
-}
-
-/**
- * find_first_zero_bit - find the first zero bit in a memory region
- * @addr: The address to start the search at
- * @size: The maximum size to search
- *
- * Returns the bit-number of the first zero bit, not the number of the byte
- * containing a bit.
- */
-static inline unsigned long find_first_zero_bit(const unsigned long *addr,
- unsigned long size)
-{
- unsigned long bytes, bits;
-
- if (!size)
- return 0;
- bytes = __ffz_word_loop(addr, size);
- bits = __ffz_word(bytes*8, __load_ulong_be(addr, bytes));
- return (bits < size) ? bits : size;
-}
-
-/**
- * find_first_bit - find the first set bit in a memory region
- * @addr: The address to start the search at
- * @size: The maximum size to search
- *
- * Returns the bit-number of the first set bit, not the number of the byte
- * containing a bit.
- */
-static inline unsigned long find_first_bit(const unsigned long * addr,
- unsigned long size)
-{
- unsigned long bytes, bits;
-
- if (!size)
- return 0;
- bytes = __ffs_word_loop(addr, size);
- bits = __ffs_word(bytes*8, __load_ulong_be(addr, bytes));
- return (bits < size) ? bits : size;
-}
-
-/**
- * find_next_zero_bit - find the first zero bit in a memory region
- * @addr: The address to base the search on
- * @offset: The bitnumber to start searching at
- * @size: The maximum size to search
- */
-static inline int find_next_zero_bit (const unsigned long * addr,
- unsigned long size,
- unsigned long offset)
-{
- const unsigned long *p;
- unsigned long bit, set;
-
- if (offset >= size)
- return size;
- bit = offset & (__BITOPS_WORDSIZE - 1);
- offset -= bit;
- size -= offset;
- p = addr + offset / __BITOPS_WORDSIZE;
- if (bit) {
- /*
- * __ffz_word returns __BITOPS_WORDSIZE
- * if no zero bit is present in the word.
- */
- set = __ffz_word(0, *p >> bit) + bit;
- if (set >= size)
- return size + offset;
- if (set < __BITOPS_WORDSIZE)
- return set + offset;
- offset += __BITOPS_WORDSIZE;
- size -= __BITOPS_WORDSIZE;
- p++;
- }
- return offset + find_first_zero_bit(p, size);
-}
-
-/**
- * find_next_bit - find the first set bit in a memory region
- * @addr: The address to base the search on
- * @offset: The bitnumber to start searching at
- * @size: The maximum size to search
- */
-static inline int find_next_bit (const unsigned long * addr,
- unsigned long size,
- unsigned long offset)
-{
- const unsigned long *p;
- unsigned long bit, set;
-
- if (offset >= size)
- return size;
- bit = offset & (__BITOPS_WORDSIZE - 1);
- offset -= bit;
- size -= offset;
- p = addr + offset / __BITOPS_WORDSIZE;
- if (bit) {
- /*
- * __ffs_word returns __BITOPS_WORDSIZE
- * if no one bit is present in the word.
- */
- set = __ffs_word(0, *p & (~0UL << bit));
- if (set >= size)
- return size + offset;
- if (set < __BITOPS_WORDSIZE)
- return set + offset;
- offset += __BITOPS_WORDSIZE;
- size -= __BITOPS_WORDSIZE;
- p++;
- }
- return offset + find_first_bit(p, size);
-}
-
-/*
- * Every architecture must define this function. It's the fastest
- * way of searching a 140-bit bitmap where the first 100 bits are
- * unlikely to be set. It's guaranteed that at least one of the 140
- * bits is cleared.
- */
-static inline int sched_find_first_bit(unsigned long *b)
-{
- return find_first_bit(b, 140);
-}
-
-#include <asm-generic/bitops/fls.h>
-#include <asm-generic/bitops/__fls.h>
-#include <asm-generic/bitops/fls64.h>
-
-#include <asm-generic/bitops/hweight.h>
-#include <asm-generic/bitops/lock.h>
-
-/*
- * ATTENTION: intel byte ordering convention for ext2 and minix !!
- * bit 0 is the LSB of addr; bit 31 is the MSB of addr;
- * bit 32 is the LSB of (addr+4).
- * That combined with the little endian byte order of Intel gives the
- * following bit order in memory:
- * 07 06 05 04 03 02 01 00 15 14 13 12 11 10 09 08 \
- * 23 22 21 20 19 18 17 16 31 30 29 28 27 26 25 24
- */
-
-#define ext2_set_bit(nr, addr) \
- __test_and_set_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
-#define ext2_set_bit_atomic(lock, nr, addr) \
- test_and_set_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
-#define ext2_clear_bit(nr, addr) \
- __test_and_clear_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
-#define ext2_clear_bit_atomic(lock, nr, addr) \
- test_and_clear_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
-#define ext2_test_bit(nr, addr) \
- test_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
-
-static inline int ext2_find_first_zero_bit(void *vaddr, unsigned int size)
-{
- unsigned long bytes, bits;
-
- if (!size)
- return 0;
- bytes = __ffz_word_loop(vaddr, size);
- bits = __ffz_word(bytes*8, __load_ulong_le(vaddr, bytes));
- return (bits < size) ? bits : size;
-}
-
-static inline int ext2_find_next_zero_bit(void *vaddr, unsigned long size,
- unsigned long offset)
-{
- unsigned long *addr = vaddr, *p;
- unsigned long bit, set;
-
- if (offset >= size)
- return size;
- bit = offset & (__BITOPS_WORDSIZE - 1);
- offset -= bit;
- size -= offset;
- p = addr + offset / __BITOPS_WORDSIZE;
- if (bit) {
- /*
- * s390 version of ffz returns __BITOPS_WORDSIZE
- * if no zero bit is present in the word.
- */
- set = ffz(__load_ulong_le(p, 0) >> bit) + bit;
- if (set >= size)
- return size + offset;
- if (set < __BITOPS_WORDSIZE)
- return set + offset;
- offset += __BITOPS_WORDSIZE;
- size -= __BITOPS_WORDSIZE;
- p++;
- }
- return offset + ext2_find_first_zero_bit(p, size);
-}
-
-static inline unsigned long ext2_find_first_bit(void *vaddr,
- unsigned long size)
-{
- unsigned long bytes, bits;
-
- if (!size)
- return 0;
- bytes = __ffs_word_loop(vaddr, size);
- bits = __ffs_word(bytes*8, __load_ulong_le(vaddr, bytes));
- return (bits < size) ? bits : size;
-}
-
-static inline int ext2_find_next_bit(void *vaddr, unsigned long size,
- unsigned long offset)
-{
- unsigned long *addr = vaddr, *p;
- unsigned long bit, set;
-
- if (offset >= size)
- return size;
- bit = offset & (__BITOPS_WORDSIZE - 1);
- offset -= bit;
- size -= offset;
- p = addr + offset / __BITOPS_WORDSIZE;
- if (bit) {
- /*
- * s390 version of ffz returns __BITOPS_WORDSIZE
- * if no zero bit is present in the word.
- */
- set = ffs(__load_ulong_le(p, 0) >> bit) + bit;
- if (set >= size)
- return size + offset;
- if (set < __BITOPS_WORDSIZE)
- return set + offset;
- offset += __BITOPS_WORDSIZE;
- size -= __BITOPS_WORDSIZE;
- p++;
- }
- return offset + ext2_find_first_bit(p, size);
-}
-
-#include <asm-generic/bitops/minix.h>
-
-#endif /* __KERNEL__ */
-
-#endif /* _S390_BITOPS_H */
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-09 17:32:14 +0000