911 lines
22 KiB
C
911 lines
22 KiB
C
#ifndef _S390_BITOPS_H
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#define _S390_BITOPS_H
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/*
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* include/asm-s390/bitops.h
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Derived from "include/asm-i386/bitops.h"
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* Copyright (C) 1992, Linus Torvalds
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*
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*/
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#ifdef __KERNEL__
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#include <linux/compiler.h>
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/*
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* 32 bit bitops format:
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* bit 0 is the LSB of *addr; bit 31 is the MSB of *addr;
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* bit 32 is the LSB of *(addr+4). That combined with the
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* big endian byte order on S390 give the following bit
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* order in memory:
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* 1f 1e 1d 1c 1b 1a 19 18 17 16 15 14 13 12 11 10 \
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* 0f 0e 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00
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* after that follows the next long with bit numbers
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* 3f 3e 3d 3c 3b 3a 39 38 37 36 35 34 33 32 31 30
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* 2f 2e 2d 2c 2b 2a 29 28 27 26 25 24 23 22 21 20
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* The reason for this bit ordering is the fact that
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* in the architecture independent code bits operations
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* of the form "flags |= (1 << bitnr)" are used INTERMIXED
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* with operation of the form "set_bit(bitnr, flags)".
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*
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* 64 bit bitops format:
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* bit 0 is the LSB of *addr; bit 63 is the MSB of *addr;
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* bit 64 is the LSB of *(addr+8). That combined with the
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* big endian byte order on S390 give the following bit
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* order in memory:
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* 3f 3e 3d 3c 3b 3a 39 38 37 36 35 34 33 32 31 30
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* 2f 2e 2d 2c 2b 2a 29 28 27 26 25 24 23 22 21 20
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* 1f 1e 1d 1c 1b 1a 19 18 17 16 15 14 13 12 11 10
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* 0f 0e 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00
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* after that follows the next long with bit numbers
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* 7f 7e 7d 7c 7b 7a 79 78 77 76 75 74 73 72 71 70
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* 6f 6e 6d 6c 6b 6a 69 68 67 66 65 64 63 62 61 60
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* 5f 5e 5d 5c 5b 5a 59 58 57 56 55 54 53 52 51 50
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* 4f 4e 4d 4c 4b 4a 49 48 47 46 45 44 43 42 41 40
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* The reason for this bit ordering is the fact that
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* in the architecture independent code bits operations
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* of the form "flags |= (1 << bitnr)" are used INTERMIXED
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* with operation of the form "set_bit(bitnr, flags)".
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*/
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/* bitmap tables from arch/S390/kernel/bitmap.S */
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extern const char _oi_bitmap[];
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extern const char _ni_bitmap[];
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extern const char _zb_findmap[];
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extern const char _sb_findmap[];
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#ifndef __s390x__
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#define __BITOPS_ALIGN 3
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#define __BITOPS_WORDSIZE 32
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#define __BITOPS_OR "or"
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#define __BITOPS_AND "nr"
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#define __BITOPS_XOR "xr"
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#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
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#define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
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asm volatile( \
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" l %0,%2\n" \
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"0: lr %1,%0\n" \
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__op_string " %1,%3\n" \
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" cs %0,%1,%2\n" \
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" jl 0b" \
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: "=&d" (__old), "=&d" (__new), \
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"=Q" (*(unsigned long *) __addr) \
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: "d" (__val), "Q" (*(unsigned long *) __addr) \
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: "cc");
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#else /* __GNUC__ */
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#define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
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asm volatile( \
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" l %0,0(%4)\n" \
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"0: lr %1,%0\n" \
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__op_string " %1,%3\n" \
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" cs %0,%1,0(%4)\n" \
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" jl 0b" \
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: "=&d" (__old), "=&d" (__new), \
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"=m" (*(unsigned long *) __addr) \
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: "d" (__val), "a" (__addr), \
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"m" (*(unsigned long *) __addr) : "cc");
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#endif /* __GNUC__ */
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#else /* __s390x__ */
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#define __BITOPS_ALIGN 7
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#define __BITOPS_WORDSIZE 64
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#define __BITOPS_OR "ogr"
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#define __BITOPS_AND "ngr"
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#define __BITOPS_XOR "xgr"
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#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
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#define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
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asm volatile( \
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" lg %0,%2\n" \
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"0: lgr %1,%0\n" \
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__op_string " %1,%3\n" \
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" csg %0,%1,%2\n" \
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" jl 0b" \
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: "=&d" (__old), "=&d" (__new), \
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"=Q" (*(unsigned long *) __addr) \
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: "d" (__val), "Q" (*(unsigned long *) __addr) \
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: "cc");
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#else /* __GNUC__ */
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#define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
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asm volatile( \
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" lg %0,0(%4)\n" \
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"0: lgr %1,%0\n" \
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__op_string " %1,%3\n" \
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" csg %0,%1,0(%4)\n" \
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" jl 0b" \
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: "=&d" (__old), "=&d" (__new), \
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"=m" (*(unsigned long *) __addr) \
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: "d" (__val), "a" (__addr), \
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"m" (*(unsigned long *) __addr) : "cc");
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#endif /* __GNUC__ */
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#endif /* __s390x__ */
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#define __BITOPS_WORDS(bits) (((bits)+__BITOPS_WORDSIZE-1)/__BITOPS_WORDSIZE)
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#define __BITOPS_BARRIER() asm volatile("" : : : "memory")
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#ifdef CONFIG_SMP
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/*
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* SMP safe set_bit routine based on compare and swap (CS)
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*/
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static inline void set_bit_cs(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr, old, new, mask;
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addr = (unsigned long) ptr;
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/* calculate address for CS */
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addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
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/* make OR mask */
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mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
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/* Do the atomic update. */
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__BITOPS_LOOP(old, new, addr, mask, __BITOPS_OR);
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}
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/*
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* SMP safe clear_bit routine based on compare and swap (CS)
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*/
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static inline void clear_bit_cs(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr, old, new, mask;
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addr = (unsigned long) ptr;
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/* calculate address for CS */
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addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
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/* make AND mask */
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mask = ~(1UL << (nr & (__BITOPS_WORDSIZE - 1)));
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/* Do the atomic update. */
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__BITOPS_LOOP(old, new, addr, mask, __BITOPS_AND);
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}
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/*
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* SMP safe change_bit routine based on compare and swap (CS)
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*/
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static inline void change_bit_cs(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr, old, new, mask;
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addr = (unsigned long) ptr;
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/* calculate address for CS */
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addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
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/* make XOR mask */
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mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
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/* Do the atomic update. */
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__BITOPS_LOOP(old, new, addr, mask, __BITOPS_XOR);
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}
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/*
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* SMP safe test_and_set_bit routine based on compare and swap (CS)
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*/
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static inline int
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test_and_set_bit_cs(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr, old, new, mask;
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addr = (unsigned long) ptr;
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/* calculate address for CS */
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addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
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/* make OR/test mask */
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mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
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/* Do the atomic update. */
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__BITOPS_LOOP(old, new, addr, mask, __BITOPS_OR);
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__BITOPS_BARRIER();
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return (old & mask) != 0;
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}
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/*
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* SMP safe test_and_clear_bit routine based on compare and swap (CS)
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*/
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static inline int
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test_and_clear_bit_cs(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr, old, new, mask;
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addr = (unsigned long) ptr;
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/* calculate address for CS */
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addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
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/* make AND/test mask */
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mask = ~(1UL << (nr & (__BITOPS_WORDSIZE - 1)));
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/* Do the atomic update. */
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__BITOPS_LOOP(old, new, addr, mask, __BITOPS_AND);
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__BITOPS_BARRIER();
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return (old ^ new) != 0;
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}
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/*
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* SMP safe test_and_change_bit routine based on compare and swap (CS)
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*/
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static inline int
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test_and_change_bit_cs(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr, old, new, mask;
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addr = (unsigned long) ptr;
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/* calculate address for CS */
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addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
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/* make XOR/test mask */
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mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
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/* Do the atomic update. */
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__BITOPS_LOOP(old, new, addr, mask, __BITOPS_XOR);
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__BITOPS_BARRIER();
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return (old & mask) != 0;
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}
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#endif /* CONFIG_SMP */
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/*
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* fast, non-SMP set_bit routine
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*/
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static inline void __set_bit(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr;
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addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
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asm volatile(
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" oc 0(1,%1),0(%2)"
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: "=m" (*(char *) addr) : "a" (addr),
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"a" (_oi_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc" );
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}
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static inline void
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__constant_set_bit(const unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr;
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addr = ((unsigned long) ptr) + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
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*(unsigned char *) addr |= 1 << (nr & 7);
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}
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#define set_bit_simple(nr,addr) \
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(__builtin_constant_p((nr)) ? \
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__constant_set_bit((nr),(addr)) : \
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__set_bit((nr),(addr)) )
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/*
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* fast, non-SMP clear_bit routine
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*/
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static inline void
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__clear_bit(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr;
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addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
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asm volatile(
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" nc 0(1,%1),0(%2)"
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: "=m" (*(char *) addr) : "a" (addr),
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"a" (_ni_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc");
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}
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static inline void
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__constant_clear_bit(const unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr;
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addr = ((unsigned long) ptr) + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
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*(unsigned char *) addr &= ~(1 << (nr & 7));
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}
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#define clear_bit_simple(nr,addr) \
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(__builtin_constant_p((nr)) ? \
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__constant_clear_bit((nr),(addr)) : \
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__clear_bit((nr),(addr)) )
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/*
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* fast, non-SMP change_bit routine
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*/
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static inline void __change_bit(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr;
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addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
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asm volatile(
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" xc 0(1,%1),0(%2)"
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: "=m" (*(char *) addr) : "a" (addr),
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"a" (_oi_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc" );
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}
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static inline void
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__constant_change_bit(const unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr;
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addr = ((unsigned long) ptr) + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
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*(unsigned char *) addr ^= 1 << (nr & 7);
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}
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#define change_bit_simple(nr,addr) \
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(__builtin_constant_p((nr)) ? \
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__constant_change_bit((nr),(addr)) : \
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__change_bit((nr),(addr)) )
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/*
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* fast, non-SMP test_and_set_bit routine
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*/
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static inline int
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test_and_set_bit_simple(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr;
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unsigned char ch;
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addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
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ch = *(unsigned char *) addr;
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asm volatile(
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" oc 0(1,%1),0(%2)"
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: "=m" (*(char *) addr)
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: "a" (addr), "a" (_oi_bitmap + (nr & 7)),
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"m" (*(char *) addr) : "cc", "memory");
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return (ch >> (nr & 7)) & 1;
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}
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#define __test_and_set_bit(X,Y) test_and_set_bit_simple(X,Y)
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/*
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* fast, non-SMP test_and_clear_bit routine
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*/
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static inline int
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test_and_clear_bit_simple(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr;
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unsigned char ch;
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addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
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ch = *(unsigned char *) addr;
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asm volatile(
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" nc 0(1,%1),0(%2)"
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: "=m" (*(char *) addr)
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: "a" (addr), "a" (_ni_bitmap + (nr & 7)),
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"m" (*(char *) addr) : "cc", "memory");
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return (ch >> (nr & 7)) & 1;
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}
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#define __test_and_clear_bit(X,Y) test_and_clear_bit_simple(X,Y)
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/*
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* fast, non-SMP test_and_change_bit routine
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*/
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static inline int
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test_and_change_bit_simple(unsigned long nr, volatile unsigned long *ptr)
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{
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unsigned long addr;
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unsigned char ch;
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addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
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ch = *(unsigned char *) addr;
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asm volatile(
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" xc 0(1,%1),0(%2)"
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: "=m" (*(char *) addr)
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: "a" (addr), "a" (_oi_bitmap + (nr & 7)),
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"m" (*(char *) addr) : "cc", "memory");
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return (ch >> (nr & 7)) & 1;
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}
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#define __test_and_change_bit(X,Y) test_and_change_bit_simple(X,Y)
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#ifdef CONFIG_SMP
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#define set_bit set_bit_cs
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#define clear_bit clear_bit_cs
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#define change_bit change_bit_cs
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#define test_and_set_bit test_and_set_bit_cs
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#define test_and_clear_bit test_and_clear_bit_cs
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#define test_and_change_bit test_and_change_bit_cs
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#else
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#define set_bit set_bit_simple
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#define clear_bit clear_bit_simple
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#define change_bit change_bit_simple
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#define test_and_set_bit test_and_set_bit_simple
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#define test_and_clear_bit test_and_clear_bit_simple
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#define test_and_change_bit test_and_change_bit_simple
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#endif
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/*
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* This routine doesn't need to be atomic.
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*/
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static inline int __test_bit(unsigned long nr, const volatile unsigned long *ptr)
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{
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unsigned long addr;
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unsigned char ch;
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addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
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ch = *(volatile unsigned char *) addr;
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return (ch >> (nr & 7)) & 1;
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}
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static inline int
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__constant_test_bit(unsigned long nr, const volatile unsigned long *addr) {
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return (((volatile char *) addr)
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[(nr^(__BITOPS_WORDSIZE-8))>>3] & (1<<(nr&7))) != 0;
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}
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#define test_bit(nr,addr) \
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(__builtin_constant_p((nr)) ? \
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__constant_test_bit((nr),(addr)) : \
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__test_bit((nr),(addr)) )
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/*
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* ffz = Find First Zero in word. Undefined if no zero exists,
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* so code should check against ~0UL first..
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*/
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static inline unsigned long ffz(unsigned long word)
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{
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unsigned long bit = 0;
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#ifdef __s390x__
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if (likely((word & 0xffffffff) == 0xffffffff)) {
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word >>= 32;
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bit += 32;
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}
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#endif
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if (likely((word & 0xffff) == 0xffff)) {
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word >>= 16;
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bit += 16;
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}
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if (likely((word & 0xff) == 0xff)) {
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word >>= 8;
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bit += 8;
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}
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return bit + _zb_findmap[word & 0xff];
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}
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/*
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* __ffs = find first bit in word. Undefined if no bit exists,
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* so code should check against 0UL first..
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*/
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static inline unsigned long __ffs (unsigned long word)
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{
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unsigned long bit = 0;
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#ifdef __s390x__
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if (likely((word & 0xffffffff) == 0)) {
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word >>= 32;
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bit += 32;
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}
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#endif
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if (likely((word & 0xffff) == 0)) {
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word >>= 16;
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bit += 16;
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}
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if (likely((word & 0xff) == 0)) {
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word >>= 8;
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bit += 8;
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}
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return bit + _sb_findmap[word & 0xff];
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}
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/*
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* Find-bit routines..
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*/
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#ifndef __s390x__
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|
|
|
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;
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asm volatile(
|
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" 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"
|
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" tml %2,0xffff\n"
|
|
" jno 2f\n"
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" ahi %0,16\n"
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" srl %2,16\n"
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"2: tml %2,0x00ff\n"
|
|
" jno 3f\n"
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|
" ahi %0,8\n"
|
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" srl %2,8\n"
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"3: nr %2,%1\n"
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" ic %2,0(%2,%5)\n"
|
|
" alr %0,%2\n"
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"4:"
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: "=&a" (res), "=&d" (cmp), "=&a" (count)
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: "a" (size), "a" (addr), "a" (&_zb_findmap),
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"m" (*(addrtype *) addr) : "cc");
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return (res < size) ? res : size;
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}
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static inline int
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find_first_bit(const unsigned long * addr, unsigned long size)
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{
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typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
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unsigned long cmp, count;
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unsigned int res;
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if (!size)
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return 0;
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asm volatile(
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" slr %1,%1\n"
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" lr %2,%3\n"
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" slr %0,%0\n"
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" ahi %2,31\n"
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" srl %2,5\n"
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"0: c %1,0(%0,%4)\n"
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" jne 1f\n"
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" la %0,4(%0)\n"
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" brct %2,0b\n"
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" lr %0,%3\n"
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" j 4f\n"
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"1: l %2,0(%0,%4)\n"
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" sll %0,3\n"
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" lhi %1,0xff\n"
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" tml %2,0xffff\n"
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" jnz 2f\n"
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" ahi %0,16\n"
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" srl %2,16\n"
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"2: tml %2,0x00ff\n"
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" jnz 3f\n"
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" ahi %0,8\n"
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" srl %2,8\n"
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"3: nr %2,%1\n"
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" ic %2,0(%2,%5)\n"
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" alr %0,%2\n"
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"4:"
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: "=&a" (res), "=&d" (cmp), "=&a" (count)
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: "a" (size), "a" (addr), "a" (&_sb_findmap),
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"m" (*(addrtype *) addr) : "cc");
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return (res < size) ? res : size;
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}
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#else /* __s390x__ */
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static inline unsigned long
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find_first_zero_bit(const unsigned long * addr, unsigned long size)
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{
|
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typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
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unsigned long res, cmp, count;
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|
|
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if (!size)
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return 0;
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asm volatile(
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" lghi %1,-1\n"
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" lgr %2,%3\n"
|
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" slgr %0,%0\n"
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" aghi %2,63\n"
|
|
" srlg %2,%2,6\n"
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"0: cg %1,0(%0,%4)\n"
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" jne 1f\n"
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" la %0,8(%0)\n"
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|
" brct %2,0b\n"
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" lgr %0,%3\n"
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|
" j 5f\n"
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"1: lg %2,0(%0,%4)\n"
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" sllg %0,%0,3\n"
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" clr %2,%1\n"
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" jne 2f\n"
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" aghi %0,32\n"
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" srlg %2,%2,32\n"
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"2: lghi %1,0xff\n"
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" tmll %2,0xffff\n"
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" jno 3f\n"
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" aghi %0,16\n"
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" srl %2,16\n"
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"3: tmll %2,0x00ff\n"
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" jno 4f\n"
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" aghi %0,8\n"
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" srl %2,8\n"
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"4: ngr %2,%1\n"
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" ic %2,0(%2,%5)\n"
|
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" algr %0,%2\n"
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"5:"
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: "=&a" (res), "=&d" (cmp), "=&a" (count)
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: "a" (size), "a" (addr), "a" (&_zb_findmap),
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"m" (*(addrtype *) addr) : "cc");
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return (res < size) ? res : size;
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}
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|
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static inline unsigned long
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find_first_bit(const unsigned long * addr, unsigned long size)
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{
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typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
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unsigned long res, cmp, count;
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|
|
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if (!size)
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return 0;
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asm volatile(
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" slgr %1,%1\n"
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" lgr %2,%3\n"
|
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" slgr %0,%0\n"
|
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" aghi %2,63\n"
|
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" srlg %2,%2,6\n"
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"0: cg %1,0(%0,%4)\n"
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" jne 1f\n"
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" aghi %0,8\n"
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" brct %2,0b\n"
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" lgr %0,%3\n"
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" j 5f\n"
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"1: lg %2,0(%0,%4)\n"
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" sllg %0,%0,3\n"
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" clr %2,%1\n"
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" jne 2f\n"
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" aghi %0,32\n"
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" srlg %2,%2,32\n"
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"2: lghi %1,0xff\n"
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" tmll %2,0xffff\n"
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" jnz 3f\n"
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" aghi %0,16\n"
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" srl %2,16\n"
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"3: tmll %2,0x00ff\n"
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" jnz 4f\n"
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" aghi %0,8\n"
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" srl %2,8\n"
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"4: ngr %2,%1\n"
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" ic %2,0(%2,%5)\n"
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" algr %0,%2\n"
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"5:"
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: "=&a" (res), "=&d" (cmp), "=&a" (count)
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: "a" (size), "a" (addr), "a" (&_sb_findmap),
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"m" (*(addrtype *) addr) : "cc");
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return (res < size) ? res : size;
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}
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#endif /* __s390x__ */
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static inline int
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find_next_zero_bit (const unsigned long * addr, unsigned long size,
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unsigned long offset)
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{
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const unsigned long *p;
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unsigned long bit, set;
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if (offset >= size)
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return size;
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bit = offset & (__BITOPS_WORDSIZE - 1);
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offset -= bit;
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size -= offset;
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p = addr + offset / __BITOPS_WORDSIZE;
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if (bit) {
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/*
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* s390 version of ffz returns __BITOPS_WORDSIZE
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* if no zero bit is present in the word.
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*/
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set = ffz(*p >> bit) + bit;
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if (set >= size)
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return size + offset;
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if (set < __BITOPS_WORDSIZE)
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|
return set + offset;
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|
offset += __BITOPS_WORDSIZE;
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|
size -= __BITOPS_WORDSIZE;
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|
p++;
|
|
}
|
|
return offset + find_first_zero_bit(p, size);
|
|
}
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|
|
static inline int
|
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find_next_bit (const unsigned long * addr, unsigned long size,
|
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unsigned long offset)
|
|
{
|
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const unsigned long *p;
|
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unsigned long bit, set;
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|
|
if (offset >= size)
|
|
return size;
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bit = offset & (__BITOPS_WORDSIZE - 1);
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offset -= bit;
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size -= offset;
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p = addr + offset / __BITOPS_WORDSIZE;
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if (bit) {
|
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/*
|
|
* s390 version of __ffs returns __BITOPS_WORDSIZE
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* if no one bit is present in the word.
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*/
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set = __ffs(*p & (~0UL << bit));
|
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if (set >= size)
|
|
return size + offset;
|
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if (set < __BITOPS_WORDSIZE)
|
|
return set + offset;
|
|
offset += __BITOPS_WORDSIZE;
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|
size -= __BITOPS_WORDSIZE;
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p++;
|
|
}
|
|
return offset + find_first_bit(p, size);
|
|
}
|
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|
|
/*
|
|
* 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)
|
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{
|
|
return find_first_bit(b, 140);
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}
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|
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#include <asm-generic/bitops/ffs.h>
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|
|
#include <asm-generic/bitops/fls.h>
|
|
#include <asm-generic/bitops/fls64.h>
|
|
|
|
#include <asm-generic/bitops/hweight.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 \
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|
* 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 */
|