mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 20:25:09 +07:00
3fc2579e6f
When testing in userspace, UBSAN pointed out that shifting into the sign bit is undefined behaviour. It doesn't really make sense to ask for the highest set bit of a negative value, so just turn the argument type into an unsigned int. Some architectures (eg ppc) already had it declared as an unsigned int, so I don't expect too many problems. Link: http://lkml.kernel.org/r/20181105221117.31828-1-willy@infradead.org Signed-off-by: Matthew Wilcox <willy@infradead.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
423 lines
10 KiB
C
423 lines
10 KiB
C
/* 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 <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, 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 char *
|
|
__bitops_byte(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
return ((unsigned char *)ptr) + ((nr ^ (BITS_PER_LONG - 8)) >> 3);
|
|
}
|
|
|
|
static inline void set_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned long *addr = __bitops_word(nr, ptr);
|
|
unsigned long mask;
|
|
|
|
#ifdef CONFIG_HAVE_MARCH_ZEC12_FEATURES
|
|
if (__builtin_constant_p(nr)) {
|
|
unsigned char *caddr = __bitops_byte(nr, ptr);
|
|
|
|
asm volatile(
|
|
"oi %0,%b1\n"
|
|
: "+Q" (*caddr)
|
|
: "i" (1 << (nr & 7))
|
|
: "cc", "memory");
|
|
return;
|
|
}
|
|
#endif
|
|
mask = 1UL << (nr & (BITS_PER_LONG - 1));
|
|
__atomic64_or(mask, addr);
|
|
}
|
|
|
|
static inline void clear_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned long *addr = __bitops_word(nr, ptr);
|
|
unsigned long mask;
|
|
|
|
#ifdef CONFIG_HAVE_MARCH_ZEC12_FEATURES
|
|
if (__builtin_constant_p(nr)) {
|
|
unsigned char *caddr = __bitops_byte(nr, ptr);
|
|
|
|
asm volatile(
|
|
"ni %0,%b1\n"
|
|
: "+Q" (*caddr)
|
|
: "i" (~(1 << (nr & 7)))
|
|
: "cc", "memory");
|
|
return;
|
|
}
|
|
#endif
|
|
mask = ~(1UL << (nr & (BITS_PER_LONG - 1)));
|
|
__atomic64_and(mask, addr);
|
|
}
|
|
|
|
static inline void change_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned long *addr = __bitops_word(nr, ptr);
|
|
unsigned long mask;
|
|
|
|
#ifdef CONFIG_HAVE_MARCH_ZEC12_FEATURES
|
|
if (__builtin_constant_p(nr)) {
|
|
unsigned char *caddr = __bitops_byte(nr, ptr);
|
|
|
|
asm volatile(
|
|
"xi %0,%b1\n"
|
|
: "+Q" (*caddr)
|
|
: "i" (1 << (nr & 7))
|
|
: "cc", "memory");
|
|
return;
|
|
}
|
|
#endif
|
|
mask = 1UL << (nr & (BITS_PER_LONG - 1));
|
|
__atomic64_xor(mask, addr);
|
|
}
|
|
|
|
static inline int
|
|
test_and_set_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned long *addr = __bitops_word(nr, ptr);
|
|
unsigned long old, mask;
|
|
|
|
mask = 1UL << (nr & (BITS_PER_LONG - 1));
|
|
old = __atomic64_or_barrier(mask, addr);
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
static inline int
|
|
test_and_clear_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned long *addr = __bitops_word(nr, ptr);
|
|
unsigned long old, mask;
|
|
|
|
mask = ~(1UL << (nr & (BITS_PER_LONG - 1)));
|
|
old = __atomic64_and_barrier(mask, addr);
|
|
return (old & ~mask) != 0;
|
|
}
|
|
|
|
static inline int
|
|
test_and_change_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned long *addr = __bitops_word(nr, ptr);
|
|
unsigned long old, mask;
|
|
|
|
mask = 1UL << (nr & (BITS_PER_LONG - 1));
|
|
old = __atomic64_xor_barrier(mask, addr);
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
static inline void __set_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned char *addr = __bitops_byte(nr, ptr);
|
|
|
|
*addr |= 1 << (nr & 7);
|
|
}
|
|
|
|
static inline void
|
|
__clear_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned char *addr = __bitops_byte(nr, ptr);
|
|
|
|
*addr &= ~(1 << (nr & 7));
|
|
}
|
|
|
|
static inline void __change_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned char *addr = __bitops_byte(nr, ptr);
|
|
|
|
*addr ^= 1 << (nr & 7);
|
|
}
|
|
|
|
static inline int
|
|
__test_and_set_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned char *addr = __bitops_byte(nr, ptr);
|
|
unsigned char ch;
|
|
|
|
ch = *addr;
|
|
*addr |= 1 << (nr & 7);
|
|
return (ch >> (nr & 7)) & 1;
|
|
}
|
|
|
|
static inline int
|
|
__test_and_clear_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned char *addr = __bitops_byte(nr, ptr);
|
|
unsigned char ch;
|
|
|
|
ch = *addr;
|
|
*addr &= ~(1 << (nr & 7));
|
|
return (ch >> (nr & 7)) & 1;
|
|
}
|
|
|
|
static inline int
|
|
__test_and_change_bit(unsigned long nr, volatile unsigned long *ptr)
|
|
{
|
|
unsigned char *addr = __bitops_byte(nr, ptr);
|
|
unsigned char ch;
|
|
|
|
ch = *addr;
|
|
*addr ^= 1 << (nr & 7);
|
|
return (ch >> (nr & 7)) & 1;
|
|
}
|
|
|
|
static inline int test_bit(unsigned long nr, const volatile unsigned long *ptr)
|
|
{
|
|
const volatile unsigned char *addr;
|
|
|
|
addr = ((const volatile unsigned char *)ptr);
|
|
addr += (nr ^ (BITS_PER_LONG - 8)) >> 3;
|
|
return (*addr >> (nr & 7)) & 1;
|
|
}
|
|
|
|
static inline int test_and_set_bit_lock(unsigned long nr,
|
|
volatile unsigned long *ptr)
|
|
{
|
|
if (test_bit(nr, ptr))
|
|
return 1;
|
|
return test_and_set_bit(nr, ptr);
|
|
}
|
|
|
|
static inline void clear_bit_unlock(unsigned long nr,
|
|
volatile unsigned long *ptr)
|
|
{
|
|
smp_mb__before_atomic();
|
|
clear_bit(nr, ptr);
|
|
}
|
|
|
|
static inline void __clear_bit_unlock(unsigned long nr,
|
|
volatile unsigned long *ptr)
|
|
{
|
|
smp_mb();
|
|
__clear_bit(nr, ptr);
|
|
}
|
|
|
|
/*
|
|
* 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 int 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 int test_bit_inv(unsigned long nr,
|
|
const volatile unsigned long *ptr)
|
|
{
|
|
return test_bit(nr ^ (BITS_PER_LONG - 1), ptr);
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
|
|
|
|
/**
|
|
* __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 {
|
|
register unsigned long bit asm("4") = word;
|
|
register unsigned long out asm("5");
|
|
|
|
asm volatile(
|
|
" flogr %[bit],%[bit]\n"
|
|
: [bit] "+d" (bit), [out] "=d" (out) : : "cc");
|
|
return bit;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* __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);
|
|
}
|
|
|
|
#else /* CONFIG_HAVE_MARCH_Z9_109_FEATURES */
|
|
|
|
#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>
|
|
|
|
#endif /* CONFIG_HAVE_MARCH_Z9_109_FEATURES */
|
|
|
|
#include <asm-generic/bitops/ffz.h>
|
|
#include <asm-generic/bitops/find.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 */
|