diff options
Diffstat (limited to 'include/asm-s390/bitops.h')
| -rw-r--r-- | include/asm-s390/bitops.h | 884 |
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 */ |