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s390/bitops: use generic find bit functions / reimplement _left variant
Just like all other architectures we should use out-of-line find bit operations, since the inline variant bloat the size of the kernel image. And also like all other architecures we should only supply optimized variants of the __ffs, ffs, etc. primitives. Therefore this patch removes the inlined s390 find bit functions and uses the generic out-of-line variants instead. The optimization of the primitives follows with the next patch. With this patch also the functions find_first_bit_left() and find_next_bit_left() have been reimplemented, since logically, they are nothing else but a find_first_bit()/find_next_bit() implementation that use an inverted __fls() instead of __ffs(). Also the restriction that these functions only work on machines which support the "flogr" instruction is gone now. This reduces the size of the kernel image (defconfig, -march=z9-109) by 144,482 bytes. Alone the size of the function build_sched_domains() gets reduced from 7 KB to 3,5 KB. We also git rid of unused functions like find_first_bit_le()... Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
Martin Schwidefsky
parent
8e6a828566
commit
746479cdcb
@ -99,6 +99,7 @@ config S390
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select CLONE_BACKWARDS2
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select GENERIC_CLOCKEVENTS
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select GENERIC_CPU_DEVICES if !SMP
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select GENERIC_FIND_FIRST_BIT
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select GENERIC_SMP_IDLE_THREAD
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select GENERIC_TIME_VSYSCALL_OLD
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select HAVE_ALIGNED_STRUCT_PAGE if SLUB
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@ -1,10 +1,40 @@
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/*
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* S390 version
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* Copyright IBM Corp. 1999
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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* Copyright IBM Corp. 1999,2013
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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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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
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*
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* The description below was taken in large parts from the powerpc
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* bitops header file:
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* Within a word, bits are numbered LSB first. Lot's of places make
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* this assumption by directly testing bits with (val & (1<<nr)).
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* This can cause confusion for large (> 1 word) bitmaps on a
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* big-endian system because, unlike little endian, the number of each
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* bit depends on the word size.
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*
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* The bitop functions are defined to work on unsigned longs, so for an
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* s390x system the bits end up numbered:
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* |63..............0|127............64|191...........128|255...........196|
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* and on s390:
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* |31.....0|63....31|95....64|127...96|159..128|191..160|223..192|255..224|
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*
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* There are a few little-endian macros used mostly for filesystem
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* bitmaps, these work on similar bit arrays layouts, but
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* byte-oriented:
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* |7...0|15...8|23...16|31...24|39...32|47...40|55...48|63...56|
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*
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* The main difference is that bit 3-5 (64b) or 3-4 (32b) in the bit
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* number field needs to be reversed compared to the big-endian bit
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* fields. This can be achieved by XOR with 0x38 (64b) or 0x18 (32b).
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*
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* We also have special functions which work with an MSB0 encoding:
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* on an s390x system the bits are numbered:
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* |0..............63|64............127|128...........191|192...........255|
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* and on s390:
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* |0.....31|31....63|64....95|96...127|128..159|160..191|192..223|224..255|
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*
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* The main difference is that bit 0-63 (64b) or 0-31 (32b) in the bit
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* number field needs to be reversed compared to the LSB0 encoded bit
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* fields. This can be achieved by XOR with 0x3f (64b) or 0x1f (32b).
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*
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*/
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@ -18,46 +48,6 @@
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#include <linux/typecheck.h>
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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.c */
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extern const char _zb_findmap[];
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extern const char _sb_findmap[];
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#ifndef CONFIG_64BIT
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#define __BITOPS_OR "or"
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@ -310,522 +300,24 @@ static inline int test_bit(unsigned long nr, const volatile unsigned long *ptr)
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}
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/*
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* Optimized find bit helper functions.
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* ATTENTION:
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* find_first_bit_left() and find_next_bit_left() use MSB0 encoding.
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*/
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unsigned long find_first_bit_left(const unsigned long *addr, unsigned long size);
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unsigned long find_next_bit_left(const unsigned long *addr, unsigned long size,
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unsigned long offset);
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/**
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* __ffz_word_loop - find byte offset of first long != -1UL
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* @addr: pointer to array of unsigned long
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* @size: size of the array in bits
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*/
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static inline unsigned long __ffz_word_loop(const unsigned long *addr,
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unsigned long size)
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{
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typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
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unsigned long bytes = 0;
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asm volatile(
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#ifndef CONFIG_64BIT
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" ahi %1,-1\n"
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" sra %1,5\n"
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" jz 1f\n"
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"0: c %2,0(%0,%3)\n"
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" jne 1f\n"
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" la %0,4(%0)\n"
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" brct %1,0b\n"
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"1:\n"
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#else
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" aghi %1,-1\n"
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" srag %1,%1,6\n"
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" jz 1f\n"
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"0: cg %2,0(%0,%3)\n"
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" jne 1f\n"
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" la %0,8(%0)\n"
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" brct %1,0b\n"
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"1:\n"
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#endif
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: "+&a" (bytes), "+&d" (size)
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: "d" (-1UL), "a" (addr), "m" (*(addrtype *) addr)
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: "cc" );
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return bytes;
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}
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/**
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* __ffs_word_loop - find byte offset of first long != 0UL
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* @addr: pointer to array of unsigned long
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* @size: size of the array in bits
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*/
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static inline unsigned long __ffs_word_loop(const unsigned long *addr,
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unsigned long size)
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{
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typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
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unsigned long bytes = 0;
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asm volatile(
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#ifndef CONFIG_64BIT
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" ahi %1,-1\n"
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" sra %1,5\n"
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" jz 1f\n"
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"0: c %2,0(%0,%3)\n"
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" jne 1f\n"
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" la %0,4(%0)\n"
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" brct %1,0b\n"
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"1:\n"
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#else
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" aghi %1,-1\n"
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" srag %1,%1,6\n"
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" jz 1f\n"
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"0: cg %2,0(%0,%3)\n"
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" jne 1f\n"
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" la %0,8(%0)\n"
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" brct %1,0b\n"
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"1:\n"
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#endif
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: "+&a" (bytes), "+&a" (size)
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: "d" (0UL), "a" (addr), "m" (*(addrtype *) addr)
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: "cc" );
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return bytes;
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}
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/**
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* __ffz_word - add number of the first unset bit
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* @nr: base value the bit number is added to
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* @word: the word that is searched for unset bits
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*/
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static inline unsigned long __ffz_word(unsigned long nr, unsigned long word)
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{
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#ifdef CONFIG_64BIT
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if ((word & 0xffffffff) == 0xffffffff) {
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word >>= 32;
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nr += 32;
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}
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#endif
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if ((word & 0xffff) == 0xffff) {
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word >>= 16;
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nr += 16;
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}
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if ((word & 0xff) == 0xff) {
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word >>= 8;
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nr += 8;
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}
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return nr + _zb_findmap[(unsigned char) word];
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}
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/**
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* __ffs_word - add number of the first set bit
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* @nr: base value the bit number is added to
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* @word: the word that is searched for set bits
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*/
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static inline unsigned long __ffs_word(unsigned long nr, unsigned long word)
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{
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#ifdef CONFIG_64BIT
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if ((word & 0xffffffff) == 0) {
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word >>= 32;
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nr += 32;
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}
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#endif
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if ((word & 0xffff) == 0) {
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word >>= 16;
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nr += 16;
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}
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if ((word & 0xff) == 0) {
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word >>= 8;
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nr += 8;
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}
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return nr + _sb_findmap[(unsigned char) word];
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}
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/**
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* __load_ulong_be - load big endian unsigned long
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* @p: pointer to array of unsigned long
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* @offset: byte offset of source value in the array
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*/
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static inline unsigned long __load_ulong_be(const unsigned long *p,
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unsigned long offset)
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{
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p = (unsigned long *)((unsigned long) p + offset);
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return *p;
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}
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/**
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* __load_ulong_le - load little endian unsigned long
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* @p: pointer to array of unsigned long
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* @offset: byte offset of source value in the array
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*/
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static inline unsigned long __load_ulong_le(const unsigned long *p,
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unsigned long offset)
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{
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unsigned long word;
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p = (unsigned long *)((unsigned long) p + offset);
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#ifndef CONFIG_64BIT
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asm volatile(
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" ic %0,%O1(%R1)\n"
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" icm %0,2,%O1+1(%R1)\n"
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" icm %0,4,%O1+2(%R1)\n"
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" icm %0,8,%O1+3(%R1)"
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: "=&d" (word) : "Q" (*p) : "cc");
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#else
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asm volatile(
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" lrvg %0,%1"
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: "=d" (word) : "m" (*p) );
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#endif
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return word;
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}
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/*
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* The various find bit functions.
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*/
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/*
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* ffz - find first zero in word.
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* @word: The word to search
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*
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* Undefined if no zero exists, 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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return __ffz_word(0, word);
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}
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/**
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* __ffs - find first bit in word.
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* @word: The word to search
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*
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* Undefined if no bit exists, so code should check against 0 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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return __ffs_word(0, word);
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}
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/**
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* ffs - find first bit set
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* @x: the word to search
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*
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* This is defined the same way as
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* the libc and compiler builtin ffs routines, therefore
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* differs in spirit from the above ffz (man ffs).
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*/
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static inline int ffs(int x)
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{
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if (!x)
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return 0;
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return __ffs_word(1, x);
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}
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/**
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* find_first_zero_bit - find the first zero bit in a memory region
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* @addr: The address to start the search at
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* @size: The maximum size to search
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*
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* Returns the bit-number of the first zero bit, not the number of the byte
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* containing a bit.
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*/
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static inline unsigned long find_first_zero_bit(const unsigned long *addr,
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unsigned long size)
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{
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unsigned long bytes, bits;
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if (!size)
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return 0;
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bytes = __ffz_word_loop(addr, size);
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bits = __ffz_word(bytes*8, __load_ulong_be(addr, bytes));
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return (bits < size) ? bits : size;
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}
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#define find_first_zero_bit find_first_zero_bit
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/**
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* find_first_bit - find the first set bit in a memory region
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* @addr: The address to start the search at
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* @size: The maximum size to search
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*
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* Returns the bit-number of the first set bit, not the number of the byte
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* containing a bit.
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*/
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static inline unsigned long find_first_bit(const unsigned long * addr,
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unsigned long size)
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{
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unsigned long bytes, bits;
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if (!size)
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return 0;
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bytes = __ffs_word_loop(addr, size);
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bits = __ffs_word(bytes*8, __load_ulong_be(addr, bytes));
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return (bits < size) ? bits : size;
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}
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#define find_first_bit find_first_bit
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/*
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* Big endian variant whichs starts bit counting from left using
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* the flogr (find leftmost one) instruction.
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*/
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static inline unsigned long __flo_word(unsigned long nr, unsigned long val)
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{
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register unsigned long bit asm("2") = val;
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register unsigned long out asm("3");
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asm volatile (
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" .insn rre,0xb9830000,%[bit],%[bit]\n"
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: [bit] "+d" (bit), [out] "=d" (out) : : "cc");
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return nr + bit;
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}
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/*
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* 64 bit special left bitops format:
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* order in memory:
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* 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
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* 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
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* 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f
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* 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f
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* after that follows the next long with bit numbers
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* 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f
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* 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f
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* 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f
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* 70 71 72 73 74 75 76 77 78 79 7a 7b 7c 7d 7e 7f
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* The reason for this bit ordering is the fact that
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* the hardware sets bits in a bitmap starting at bit 0
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* and we don't want to scan the bitmap from the 'wrong
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* end'.
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*/
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static inline unsigned long find_first_bit_left(const unsigned long *addr,
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unsigned long size)
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{
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unsigned long bytes, bits;
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if (!size)
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return 0;
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bytes = __ffs_word_loop(addr, size);
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bits = __flo_word(bytes * 8, __load_ulong_be(addr, bytes));
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return (bits < size) ? bits : size;
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}
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static inline int find_next_bit_left(const unsigned long *addr,
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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 & (BITS_PER_LONG - 1);
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offset -= bit;
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size -= offset;
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p = addr + offset / BITS_PER_LONG;
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if (bit) {
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set = __flo_word(0, *p & (~0UL >> bit));
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if (set >= size)
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return size + offset;
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if (set < BITS_PER_LONG)
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return set + offset;
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offset += BITS_PER_LONG;
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size -= BITS_PER_LONG;
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p++;
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}
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return offset + find_first_bit_left(p, size);
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}
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#define for_each_set_bit_left(bit, addr, size) \
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for ((bit) = find_first_bit_left((addr), (size)); \
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(bit) < (size); \
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(bit) = find_next_bit_left((addr), (size), (bit) + 1))
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/* same as for_each_set_bit() but use bit as value to start with */
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#define for_each_set_bit_left_cont(bit, addr, size) \
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for ((bit) = find_next_bit_left((addr), (size), (bit)); \
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(bit) < (size); \
|
||||
(bit) = find_next_bit_left((addr), (size), (bit) + 1))
|
||||
|
||||
/**
|
||||
* 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 & (BITS_PER_LONG - 1);
|
||||
offset -= bit;
|
||||
size -= offset;
|
||||
p = addr + offset / BITS_PER_LONG;
|
||||
if (bit) {
|
||||
/*
|
||||
* __ffz_word returns BITS_PER_LONG
|
||||
* if no zero bit is present in the word.
|
||||
*/
|
||||
set = __ffz_word(bit, *p >> bit);
|
||||
if (set >= size)
|
||||
return size + offset;
|
||||
if (set < BITS_PER_LONG)
|
||||
return set + offset;
|
||||
offset += BITS_PER_LONG;
|
||||
size -= BITS_PER_LONG;
|
||||
p++;
|
||||
}
|
||||
return offset + find_first_zero_bit(p, size);
|
||||
}
|
||||
#define find_next_zero_bit find_next_zero_bit
|
||||
|
||||
/**
|
||||
* 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 & (BITS_PER_LONG - 1);
|
||||
offset -= bit;
|
||||
size -= offset;
|
||||
p = addr + offset / BITS_PER_LONG;
|
||||
if (bit) {
|
||||
/*
|
||||
* __ffs_word returns BITS_PER_LONG
|
||||
* if no one bit is present in the word.
|
||||
*/
|
||||
set = __ffs_word(0, *p & (~0UL << bit));
|
||||
if (set >= size)
|
||||
return size + offset;
|
||||
if (set < BITS_PER_LONG)
|
||||
return set + offset;
|
||||
offset += BITS_PER_LONG;
|
||||
size -= BITS_PER_LONG;
|
||||
p++;
|
||||
}
|
||||
return offset + find_first_bit(p, size);
|
||||
}
|
||||
#define find_next_bit find_next_bit
|
||||
|
||||
/*
|
||||
* 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/__ffs.h>
|
||||
#include <asm-generic/bitops/ffs.h>
|
||||
#include <asm-generic/bitops/__fls.h>
|
||||
#include <asm-generic/bitops/fls.h>
|
||||
#include <asm-generic/bitops/fls64.h>
|
||||
|
||||
#include <asm-generic/bitops/ffz.h>
|
||||
#include <asm-generic/bitops/find.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
|
||||
*/
|
||||
|
||||
static inline int find_first_zero_bit_le(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;
|
||||
}
|
||||
#define find_first_zero_bit_le find_first_zero_bit_le
|
||||
|
||||
static inline int find_next_zero_bit_le(void *vaddr, unsigned long size,
|
||||
unsigned long offset)
|
||||
{
|
||||
unsigned long *addr = vaddr, *p;
|
||||
unsigned long bit, set;
|
||||
|
||||
if (offset >= size)
|
||||
return size;
|
||||
bit = offset & (BITS_PER_LONG - 1);
|
||||
offset -= bit;
|
||||
size -= offset;
|
||||
p = addr + offset / BITS_PER_LONG;
|
||||
if (bit) {
|
||||
/*
|
||||
* s390 version of ffz returns BITS_PER_LONG
|
||||
* if no zero bit is present in the word.
|
||||
*/
|
||||
set = __ffz_word(bit, __load_ulong_le(p, 0) >> bit);
|
||||
if (set >= size)
|
||||
return size + offset;
|
||||
if (set < BITS_PER_LONG)
|
||||
return set + offset;
|
||||
offset += BITS_PER_LONG;
|
||||
size -= BITS_PER_LONG;
|
||||
p++;
|
||||
}
|
||||
return offset + find_first_zero_bit_le(p, size);
|
||||
}
|
||||
#define find_next_zero_bit_le find_next_zero_bit_le
|
||||
|
||||
static inline unsigned long find_first_bit_le(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;
|
||||
}
|
||||
#define find_first_bit_le find_first_bit_le
|
||||
|
||||
static inline int find_next_bit_le(void *vaddr, unsigned long size,
|
||||
unsigned long offset)
|
||||
{
|
||||
unsigned long *addr = vaddr, *p;
|
||||
unsigned long bit, set;
|
||||
|
||||
if (offset >= size)
|
||||
return size;
|
||||
bit = offset & (BITS_PER_LONG - 1);
|
||||
offset -= bit;
|
||||
size -= offset;
|
||||
p = addr + offset / BITS_PER_LONG;
|
||||
if (bit) {
|
||||
/*
|
||||
* s390 version of ffz returns BITS_PER_LONG
|
||||
* if no zero bit is present in the word.
|
||||
*/
|
||||
set = __ffs_word(0, __load_ulong_le(p, 0) & (~0UL << bit));
|
||||
if (set >= size)
|
||||
return size + offset;
|
||||
if (set < BITS_PER_LONG)
|
||||
return set + offset;
|
||||
offset += BITS_PER_LONG;
|
||||
size -= BITS_PER_LONG;
|
||||
p++;
|
||||
}
|
||||
return offset + find_first_bit_le(p, size);
|
||||
}
|
||||
#define find_next_bit_le find_next_bit_le
|
||||
|
||||
#include <asm-generic/bitops/sched.h>
|
||||
#include <asm-generic/bitops/le.h>
|
||||
|
||||
#include <asm-generic/bitops/ext2-atomic-setbit.h>
|
||||
|
||||
#endif /* _S390_BITOPS_H */
|
||||
|
||||
@ -28,7 +28,7 @@ CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
|
||||
|
||||
CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w
|
||||
|
||||
obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o vtime.o
|
||||
obj-y := traps.o time.o process.o base.o early.o setup.o vtime.o
|
||||
obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
|
||||
obj-y += debug.o irq.o ipl.o dis.o diag.o sclp.o vdso.o
|
||||
obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
|
||||
|
||||
@ -1,48 +0,0 @@
|
||||
/*
|
||||
* Bitmaps for set_bit, clear_bit, test_and_set_bit, ...
|
||||
* See include/asm/{bitops.h|posix_types.h} for details
|
||||
*
|
||||
* Copyright IBM Corp. 1999, 2009
|
||||
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
|
||||
*/
|
||||
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/module.h>
|
||||
|
||||
const char _zb_findmap[] = {
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,5,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,6,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,5,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,7,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,5,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,6,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,5,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,
|
||||
0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,8 };
|
||||
EXPORT_SYMBOL(_zb_findmap);
|
||||
|
||||
const char _sb_findmap[] = {
|
||||
8,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
6,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
7,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
6,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
|
||||
4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0 };
|
||||
EXPORT_SYMBOL(_sb_findmap);
|
||||
@ -2,7 +2,7 @@
|
||||
# Makefile for s390-specific library files..
|
||||
#
|
||||
|
||||
lib-y += delay.o string.o uaccess_std.o uaccess_pt.o
|
||||
lib-y += delay.o string.o uaccess_std.o uaccess_pt.o find.o
|
||||
obj-$(CONFIG_32BIT) += div64.o qrnnd.o ucmpdi2.o mem32.o
|
||||
obj-$(CONFIG_64BIT) += mem64.o
|
||||
lib-$(CONFIG_64BIT) += uaccess_mvcos.o
|
||||
|
||||
77
arch/s390/lib/find.c
Normal file
77
arch/s390/lib/find.c
Normal file
@ -0,0 +1,77 @@
|
||||
/*
|
||||
* MSB0 numbered special bitops handling.
|
||||
*
|
||||
* On s390x the bits are numbered:
|
||||
* |0..............63|64............127|128...........191|192...........255|
|
||||
* and on s390:
|
||||
* |0.....31|31....63|64....95|96...127|128..159|160..191|192..223|224..255|
|
||||
*
|
||||
* The reason for this bit numbering is the fact that the hardware sets bits
|
||||
* in a bitmap starting at bit 0 (MSB) and we don't want to scan the bitmap
|
||||
* from the 'wrong end'.
|
||||
*/
|
||||
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/export.h>
|
||||
|
||||
unsigned long find_first_bit_left(const unsigned long *addr, unsigned long size)
|
||||
{
|
||||
const unsigned long *p = addr;
|
||||
unsigned long result = 0;
|
||||
unsigned long tmp;
|
||||
|
||||
while (size & ~(BITS_PER_LONG - 1)) {
|
||||
if ((tmp = *(p++)))
|
||||
goto found;
|
||||
result += BITS_PER_LONG;
|
||||
size -= BITS_PER_LONG;
|
||||
}
|
||||
if (!size)
|
||||
return result;
|
||||
tmp = (*p) & (~0UL << (BITS_PER_LONG - size));
|
||||
if (!tmp) /* Are any bits set? */
|
||||
return result + size; /* Nope. */
|
||||
found:
|
||||
return result + (__fls(tmp) ^ (BITS_PER_LONG - 1));
|
||||
}
|
||||
EXPORT_SYMBOL(find_first_bit_left);
|
||||
|
||||
unsigned long find_next_bit_left(const unsigned long *addr, unsigned long size,
|
||||
unsigned long offset)
|
||||
{
|
||||
const unsigned long *p = addr + (offset / BITS_PER_LONG);
|
||||
unsigned long result = offset & ~(BITS_PER_LONG - 1);
|
||||
unsigned long tmp;
|
||||
|
||||
if (offset >= size)
|
||||
return size;
|
||||
size -= result;
|
||||
offset %= BITS_PER_LONG;
|
||||
if (offset) {
|
||||
tmp = *(p++);
|
||||
tmp &= (~0UL >> offset);
|
||||
if (size < BITS_PER_LONG)
|
||||
goto found_first;
|
||||
if (tmp)
|
||||
goto found_middle;
|
||||
size -= BITS_PER_LONG;
|
||||
result += BITS_PER_LONG;
|
||||
}
|
||||
while (size & ~(BITS_PER_LONG-1)) {
|
||||
if ((tmp = *(p++)))
|
||||
goto found_middle;
|
||||
result += BITS_PER_LONG;
|
||||
size -= BITS_PER_LONG;
|
||||
}
|
||||
if (!size)
|
||||
return result;
|
||||
tmp = *p;
|
||||
found_first:
|
||||
tmp &= (~0UL << (BITS_PER_LONG - size));
|
||||
if (!tmp) /* Are any bits set? */
|
||||
return result + size; /* Nope. */
|
||||
found_middle:
|
||||
return result + (__fls(tmp) ^ (BITS_PER_LONG - 1));
|
||||
}
|
||||
EXPORT_SYMBOL(find_next_bit_left);
|
||||
Loading…
Reference in New Issue
Block a user