#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)) ) /* * ffz = Find First Zero in word. Undefined if no zero exists, * so code should check against ~0UL first.. */ static inline unsigned long ffz(unsigned long word) { unsigned long bit = 0; #ifdef __s390x__ if (likely((word & 0xffffffff) == 0xffffffff)) { word >>= 32; bit += 32; } #endif if (likely((word & 0xffff) == 0xffff)) { word >>= 16; bit += 16; } if (likely((word & 0xff) == 0xff)) { word >>= 8; bit += 8; } return bit + _zb_findmap[word & 0xff]; } /* * __ffs = find first bit in word. Undefined if no bit exists, * so code should check against 0UL first.. */ static inline unsigned long __ffs (unsigned long word) { unsigned long bit = 0; #ifdef __s390x__ if (likely((word & 0xffffffff) == 0)) { word >>= 32; bit += 32; } #endif if (likely((word & 0xffff) == 0)) { word >>= 16; bit += 16; } if (likely((word & 0xff) == 0)) { word >>= 8; bit += 8; } return bit + _sb_findmap[word & 0xff]; } /* * Find-bit routines.. */ #ifndef __s390x__ static inline int find_first_zero_bit(const unsigned long * addr, unsigned long size) { typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype; unsigned long cmp, count; unsigned int res; if (!size) return 0; asm volatile( " lhi %1,-1\n" " lr %2,%3\n" " slr %0,%0\n" " ahi %2,31\n" " srl %2,5\n" "0: c %1,0(%0,%4)\n" " jne 1f\n" " la %0,4(%0)\n" " brct %2,0b\n" " lr %0,%3\n" " j 4f\n" "1: l %2,0(%0,%4)\n" " sll %0,3\n" " lhi %1,0xff\n" " tml %2,0xffff\n" " jno 2f\n" " ahi %0,16\n" " srl %2,16\n" "2: tml %2,0x00ff\n" " jno 3f\n" " ahi %0,8\n" " srl %2,8\n" "3: nr %2,%1\n" " ic %2,0(%2,%5)\n" " alr %0,%2\n" "4:" : "=&a" (res), "=&d" (cmp), "=&a" (count) : "a" (size), "a" (addr), "a" (&_zb_findmap), "m" (*(addrtype *) addr) : "cc"); return (res < size) ? res : size; } static inline int find_first_bit(const unsigned long * addr, unsigned long size) { typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype; unsigned long cmp, count; unsigned int res; if (!size) return 0; asm volatile( " slr %1,%1\n" " lr %2,%3\n" " slr %0,%0\n" " ahi %2,31\n" " srl %2,5\n" "0: c %1,0(%0,%4)\n" " jne 1f\n" " la %0,4(%0)\n" " brct %2,0b\n" " lr %0,%3\n" " j 4f\n" "1: l %2,0(%0,%4)\n" " sll %0,3\n" " lhi %1,0xff\n" " tml %2,0xffff\n" " jnz 2f\n" " ahi %0,16\n" " srl %2,16\n" "2: tml %2,0x00ff\n" " jnz 3f\n" " ahi %0,8\n" " srl %2,8\n" "3: nr %2,%1\n" " ic %2,0(%2,%5)\n" " alr %0,%2\n" "4:" : "=&a" (res), "=&d" (cmp), "=&a" (count) : "a" (size), "a" (addr), "a" (&_sb_findmap), "m" (*(addrtype *) addr) : "cc"); return (res < size) ? res : size; } #else /* __s390x__ */ static inline unsigned long find_first_zero_bit(const unsigned long * addr, unsigned long size) { typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype; unsigned long res, cmp, count; if (!size) return 0; asm volatile( " lghi %1,-1\n" " lgr %2,%3\n" " slgr %0,%0\n" " aghi %2,63\n" " srlg %2,%2,6\n" "0: cg %1,0(%0,%4)\n" " jne 1f\n" " la %0,8(%0)\n" " brct %2,0b\n" " lgr %0,%3\n" " j 5f\n" "1: lg %2,0(%0,%4)\n" " sllg %0,%0,3\n" " clr %2,%1\n" " jne 2f\n" " aghi %0,32\n" " srlg %2,%2,32\n" "2: lghi %1,0xff\n" " tmll %2,0xffff\n" " jno 3f\n" " aghi %0,16\n" " srl %2,16\n" "3: tmll %2,0x00ff\n" " jno 4f\n" " aghi %0,8\n" " srl %2,8\n" "4: ngr %2,%1\n" " ic %2,0(%2,%5)\n" " algr %0,%2\n" "5:" : "=&a" (res), "=&d" (cmp), "=&a" (count) : "a" (size), "a" (addr), "a" (&_zb_findmap), "m" (*(addrtype *) addr) : "cc"); return (res < size) ? res : size; } static inline unsigned long find_first_bit(const unsigned long * addr, unsigned long size) { typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype; unsigned long res, cmp, count; if (!size) return 0; asm volatile( " slgr %1,%1\n" " lgr %2,%3\n" " slgr %0,%0\n" " aghi %2,63\n" " srlg %2,%2,6\n" "0: cg %1,0(%0,%4)\n" " jne 1f\n" " aghi %0,8\n" " brct %2,0b\n" " lgr %0,%3\n" " j 5f\n" "1: lg %2,0(%0,%4)\n" " sllg %0,%0,3\n" " clr %2,%1\n" " jne 2f\n" " aghi %0,32\n" " srlg %2,%2,32\n" "2: lghi %1,0xff\n" " tmll %2,0xffff\n" " jnz 3f\n" " aghi %0,16\n" " srl %2,16\n" "3: tmll %2,0x00ff\n" " jnz 4f\n" " aghi %0,8\n" " srl %2,8\n" "4: ngr %2,%1\n" " ic %2,0(%2,%5)\n" " algr %0,%2\n" "5:" : "=&a" (res), "=&d" (cmp), "=&a" (count) : "a" (size), "a" (addr), "a" (&_sb_findmap), "m" (*(addrtype *) addr) : "cc"); return (res < size) ? res : size; } #endif /* __s390x__ */ 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) { /* * s390 version of ffz returns __BITOPS_WORDSIZE * if no zero bit is present in the word. */ set = ffz(*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); } 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) { /* * s390 version of __ffs returns __BITOPS_WORDSIZE * if no one bit is present in the word. */ set = __ffs(*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/ffs.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) #ifndef __s390x__ static inline int ext2_find_first_zero_bit(void *vaddr, unsigned int size) { typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype; unsigned long cmp, count; unsigned int res; if (!size) return 0; asm volatile( " lhi %1,-1\n" " lr %2,%3\n" " ahi %2,31\n" " srl %2,5\n" " slr %0,%0\n" "0: cl %1,0(%0,%4)\n" " jne 1f\n" " ahi %0,4\n" " brct %2,0b\n" " lr %0,%3\n" " j 4f\n" "1: l %2,0(%0,%4)\n" " sll %0,3\n" " ahi %0,24\n" " lhi %1,0xff\n" " tmh %2,0xffff\n" " jo 2f\n" " ahi %0,-16\n" " srl %2,16\n" "2: tml %2,0xff00\n" " jo 3f\n" " ahi %0,-8\n" " srl %2,8\n" "3: nr %2,%1\n" " ic %2,0(%2,%5)\n" " alr %0,%2\n" "4:" : "=&a" (res), "=&d" (cmp), "=&a" (count) : "a" (size), "a" (vaddr), "a" (&_zb_findmap), "m" (*(addrtype *) vaddr) : "cc"); return (res < size) ? res : size; } #else /* __s390x__ */ static inline unsigned long ext2_find_first_zero_bit(void *vaddr, unsigned long size) { typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype; unsigned long res, cmp, count; if (!size) return 0; asm volatile( " lghi %1,-1\n" " lgr %2,%3\n" " aghi %2,63\n" " srlg %2,%2,6\n" " slgr %0,%0\n" "0: clg %1,0(%0,%4)\n" " jne 1f\n" " aghi %0,8\n" " brct %2,0b\n" " lgr %0,%3\n" " j 5f\n" "1: cl %1,0(%0,%4)\n" " jne 2f\n" " aghi %0,4\n" "2: l %2,0(%0,%4)\n" " sllg %0,%0,3\n" " aghi %0,24\n" " lghi %1,0xff\n" " tmlh %2,0xffff\n" " jo 3f\n" " aghi %0,-16\n" " srl %2,16\n" "3: tmll %2,0xff00\n" " jo 4f\n" " aghi %0,-8\n" " srl %2,8\n" "4: ngr %2,%1\n" " ic %2,0(%2,%5)\n" " algr %0,%2\n" "5:" : "=&a" (res), "=&d" (cmp), "=&a" (count) : "a" (size), "a" (vaddr), "a" (&_zb_findmap), "m" (*(addrtype *) vaddr) : "cc"); return (res < size) ? res : size; } #endif /* __s390x__ */ static inline int ext2_find_next_zero_bit(void *vaddr, unsigned long size, unsigned long offset) { unsigned long *addr = vaddr, *p; unsigned long word, bit, set; if (offset >= size) return size; bit = offset & (__BITOPS_WORDSIZE - 1); offset -= bit; size -= offset; p = addr + offset / __BITOPS_WORDSIZE; if (bit) { #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)" : "=&a" (word) : "a" (p), "m" (*p) : "cc"); #else asm volatile( " lrvg %0,%1" : "=a" (word) : "m" (*p) ); #endif /* * s390 version of ffz returns __BITOPS_WORDSIZE * if no zero bit is present in the word. */ set = ffz(word >> 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); } #include <asm-generic/bitops/minix.h> #endif /* __KERNEL__ */ #endif /* _S390_BITOPS_H */