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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/s390/include/asm/bitops.h | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/s390/include/asm/bitops.h')
-rw-r--r-- | arch/s390/include/asm/bitops.h | 378 |
1 files changed, 378 insertions, 0 deletions
diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h new file mode 100644 index 0000000000..2de74fcd05 --- /dev/null +++ b/arch/s390/include/asm/bitops.h @@ -0,0 +1,378 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 1999,2013 + * + * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>, + * + * The description below was taken in large parts from the powerpc + * bitops header file: + * Within a word, bits are numbered LSB first. Lot's of places make + * this assumption by directly testing bits with (val & (1<<nr)). + * This can cause confusion for large (> 1 word) bitmaps on a + * big-endian system because, unlike little endian, the number of each + * bit depends on the word size. + * + * The bitop functions are defined to work on unsigned longs, so the bits + * end up numbered: + * |63..............0|127............64|191...........128|255...........192| + * + * We also have special functions which work with an MSB0 encoding. + * The bits are numbered: + * |0..............63|64............127|128...........191|192...........255| + * + * The main difference is that bit 0-63 in the bit number field needs to be + * reversed compared to the LSB0 encoded bit fields. This can be achieved by + * XOR with 0x3f. + * + */ + +#ifndef _S390_BITOPS_H +#define _S390_BITOPS_H + +#ifndef _LINUX_BITOPS_H +#error only <linux/bitops.h> can be included directly +#endif + +#include <linux/typecheck.h> +#include <linux/compiler.h> +#include <linux/types.h> +#include <asm/atomic_ops.h> +#include <asm/barrier.h> + +#define __BITOPS_WORDS(bits) (((bits) + BITS_PER_LONG - 1) / BITS_PER_LONG) + +static inline unsigned long * +__bitops_word(unsigned long nr, const volatile unsigned long *ptr) +{ + unsigned long addr; + + addr = (unsigned long)ptr + ((nr ^ (nr & (BITS_PER_LONG - 1))) >> 3); + return (unsigned long *)addr; +} + +static inline unsigned long __bitops_mask(unsigned long nr) +{ + return 1UL << (nr & (BITS_PER_LONG - 1)); +} + +static __always_inline void arch_set_bit(unsigned long nr, volatile unsigned long *ptr) +{ + unsigned long *addr = __bitops_word(nr, ptr); + unsigned long mask = __bitops_mask(nr); + + __atomic64_or(mask, (long *)addr); +} + +static __always_inline void arch_clear_bit(unsigned long nr, volatile unsigned long *ptr) +{ + unsigned long *addr = __bitops_word(nr, ptr); + unsigned long mask = __bitops_mask(nr); + + __atomic64_and(~mask, (long *)addr); +} + +static __always_inline void arch_change_bit(unsigned long nr, + volatile unsigned long *ptr) +{ + unsigned long *addr = __bitops_word(nr, ptr); + unsigned long mask = __bitops_mask(nr); + + __atomic64_xor(mask, (long *)addr); +} + +static inline bool arch_test_and_set_bit(unsigned long nr, + volatile unsigned long *ptr) +{ + unsigned long *addr = __bitops_word(nr, ptr); + unsigned long mask = __bitops_mask(nr); + unsigned long old; + + old = __atomic64_or_barrier(mask, (long *)addr); + return old & mask; +} + +static inline bool arch_test_and_clear_bit(unsigned long nr, + volatile unsigned long *ptr) +{ + unsigned long *addr = __bitops_word(nr, ptr); + unsigned long mask = __bitops_mask(nr); + unsigned long old; + + old = __atomic64_and_barrier(~mask, (long *)addr); + return old & mask; +} + +static inline bool arch_test_and_change_bit(unsigned long nr, + volatile unsigned long *ptr) +{ + unsigned long *addr = __bitops_word(nr, ptr); + unsigned long mask = __bitops_mask(nr); + unsigned long old; + + old = __atomic64_xor_barrier(mask, (long *)addr); + return old & mask; +} + +static __always_inline void +arch___set_bit(unsigned long nr, volatile unsigned long *addr) +{ + unsigned long *p = __bitops_word(nr, addr); + unsigned long mask = __bitops_mask(nr); + + *p |= mask; +} + +static __always_inline void +arch___clear_bit(unsigned long nr, volatile unsigned long *addr) +{ + unsigned long *p = __bitops_word(nr, addr); + unsigned long mask = __bitops_mask(nr); + + *p &= ~mask; +} + +static __always_inline void +arch___change_bit(unsigned long nr, volatile unsigned long *addr) +{ + unsigned long *p = __bitops_word(nr, addr); + unsigned long mask = __bitops_mask(nr); + + *p ^= mask; +} + +static __always_inline bool +arch___test_and_set_bit(unsigned long nr, volatile unsigned long *addr) +{ + unsigned long *p = __bitops_word(nr, addr); + unsigned long mask = __bitops_mask(nr); + unsigned long old; + + old = *p; + *p |= mask; + return old & mask; +} + +static __always_inline bool +arch___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr) +{ + unsigned long *p = __bitops_word(nr, addr); + unsigned long mask = __bitops_mask(nr); + unsigned long old; + + old = *p; + *p &= ~mask; + return old & mask; +} + +static __always_inline bool +arch___test_and_change_bit(unsigned long nr, volatile unsigned long *addr) +{ + unsigned long *p = __bitops_word(nr, addr); + unsigned long mask = __bitops_mask(nr); + unsigned long old; + + old = *p; + *p ^= mask; + return old & mask; +} + +#define arch_test_bit generic_test_bit +#define arch_test_bit_acquire generic_test_bit_acquire + +static inline bool arch_test_and_set_bit_lock(unsigned long nr, + volatile unsigned long *ptr) +{ + if (arch_test_bit(nr, ptr)) + return true; + return arch_test_and_set_bit(nr, ptr); +} + +static inline void arch_clear_bit_unlock(unsigned long nr, + volatile unsigned long *ptr) +{ + smp_mb__before_atomic(); + arch_clear_bit(nr, ptr); +} + +static inline void arch___clear_bit_unlock(unsigned long nr, + volatile unsigned long *ptr) +{ + smp_mb(); + arch___clear_bit(nr, ptr); +} + +#include <asm-generic/bitops/instrumented-atomic.h> +#include <asm-generic/bitops/instrumented-non-atomic.h> +#include <asm-generic/bitops/instrumented-lock.h> + +/* + * Functions which use MSB0 bit numbering. + * The bits are numbered: + * |0..............63|64............127|128...........191|192...........255| + */ +unsigned long find_first_bit_inv(const unsigned long *addr, unsigned long size); +unsigned long find_next_bit_inv(const unsigned long *addr, unsigned long size, + unsigned long offset); + +#define for_each_set_bit_inv(bit, addr, size) \ + for ((bit) = find_first_bit_inv((addr), (size)); \ + (bit) < (size); \ + (bit) = find_next_bit_inv((addr), (size), (bit) + 1)) + +static inline void set_bit_inv(unsigned long nr, volatile unsigned long *ptr) +{ + return set_bit(nr ^ (BITS_PER_LONG - 1), ptr); +} + +static inline void clear_bit_inv(unsigned long nr, volatile unsigned long *ptr) +{ + return clear_bit(nr ^ (BITS_PER_LONG - 1), ptr); +} + +static inline bool test_and_clear_bit_inv(unsigned long nr, + volatile unsigned long *ptr) +{ + return test_and_clear_bit(nr ^ (BITS_PER_LONG - 1), ptr); +} + +static inline void __set_bit_inv(unsigned long nr, volatile unsigned long *ptr) +{ + return __set_bit(nr ^ (BITS_PER_LONG - 1), ptr); +} + +static inline void __clear_bit_inv(unsigned long nr, volatile unsigned long *ptr) +{ + return __clear_bit(nr ^ (BITS_PER_LONG - 1), ptr); +} + +static inline bool test_bit_inv(unsigned long nr, + const volatile unsigned long *ptr) +{ + return test_bit(nr ^ (BITS_PER_LONG - 1), ptr); +} + +/** + * __flogr - find leftmost one + * @word - The word to search + * + * Returns the bit number of the most significant bit set, + * where the most significant bit has bit number 0. + * If no bit is set this function returns 64. + */ +static inline unsigned char __flogr(unsigned long word) +{ + if (__builtin_constant_p(word)) { + unsigned long bit = 0; + + if (!word) + return 64; + if (!(word & 0xffffffff00000000UL)) { + word <<= 32; + bit += 32; + } + if (!(word & 0xffff000000000000UL)) { + word <<= 16; + bit += 16; + } + if (!(word & 0xff00000000000000UL)) { + word <<= 8; + bit += 8; + } + if (!(word & 0xf000000000000000UL)) { + word <<= 4; + bit += 4; + } + if (!(word & 0xc000000000000000UL)) { + word <<= 2; + bit += 2; + } + if (!(word & 0x8000000000000000UL)) { + word <<= 1; + bit += 1; + } + return bit; + } else { + union register_pair rp; + + rp.even = word; + asm volatile( + " flogr %[rp],%[rp]\n" + : [rp] "+d" (rp.pair) : : "cc"); + return rp.even; + } +} + +/** + * __ffs - find first bit in word. + * @word: The word to search + * + * Undefined if no bit exists, so code should check against 0 first. + */ +static inline unsigned long __ffs(unsigned long word) +{ + return __flogr(-word & word) ^ (BITS_PER_LONG - 1); +} + +/** + * ffs - find first bit set + * @word: the word to search + * + * This is defined the same way as the libc and + * compiler builtin ffs routines (man ffs). + */ +static inline int ffs(int word) +{ + unsigned long mask = 2 * BITS_PER_LONG - 1; + unsigned int val = (unsigned int)word; + + return (1 + (__flogr(-val & val) ^ (BITS_PER_LONG - 1))) & mask; +} + +/** + * __fls - find last (most-significant) set bit in a long word + * @word: the word to search + * + * Undefined if no set bit exists, so code should check against 0 first. + */ +static inline unsigned long __fls(unsigned long word) +{ + return __flogr(word) ^ (BITS_PER_LONG - 1); +} + +/** + * fls64 - find last set bit in a 64-bit word + * @word: the word to search + * + * This is defined in a similar way as the libc and compiler builtin + * ffsll, but returns the position of the most significant set bit. + * + * fls64(value) returns 0 if value is 0 or the position of the last + * set bit if value is nonzero. The last (most significant) bit is + * at position 64. + */ +static inline int fls64(unsigned long word) +{ + unsigned long mask = 2 * BITS_PER_LONG - 1; + + return (1 + (__flogr(word) ^ (BITS_PER_LONG - 1))) & mask; +} + +/** + * fls - find last (most-significant) bit set + * @word: the word to search + * + * This is defined the same way as ffs. + * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. + */ +static inline int fls(unsigned int word) +{ + return fls64(word); +} + +#include <asm-generic/bitops/ffz.h> +#include <asm-generic/bitops/hweight.h> +#include <asm-generic/bitops/sched.h> +#include <asm-generic/bitops/le.h> +#include <asm-generic/bitops/ext2-atomic-setbit.h> + +#endif /* _S390_BITOPS_H */ |