Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_WORD_AT_A_TIME_H
|
|
#define _ASM_WORD_AT_A_TIME_H
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/wordpart.h>
|
|
#include <asm/asm-extable.h>
|
|
#include <asm/bitsperlong.h>
|
|
|
|
struct word_at_a_time {
|
|
const unsigned long bits;
|
|
};
|
|
|
|
#define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x7f) }
|
|
|
|
static inline unsigned long prep_zero_mask(unsigned long val, unsigned long data, const struct word_at_a_time *c)
|
|
{
|
|
return data;
|
|
}
|
|
|
|
static inline unsigned long create_zero_mask(unsigned long data)
|
|
{
|
|
return __fls(data);
|
|
}
|
|
|
|
static inline unsigned long find_zero(unsigned long data)
|
|
{
|
|
return (data ^ (BITS_PER_LONG - 1)) >> 3;
|
|
}
|
|
|
|
static inline unsigned long has_zero(unsigned long val, unsigned long *data, const struct word_at_a_time *c)
|
|
{
|
|
unsigned long mask = (val & c->bits) + c->bits;
|
|
|
|
*data = ~(mask | val | c->bits);
|
|
return *data;
|
|
}
|
|
|
|
static inline unsigned long zero_bytemask(unsigned long data)
|
|
{
|
|
return ~1UL << data;
|
|
}
|
|
|
|
/*
|
|
* Load an unaligned word from kernel space.
|
|
*
|
|
* In the (very unlikely) case of the word being a page-crosser
|
|
* and the next page not being mapped, take the exception and
|
|
* return zeroes in the non-existing part.
|
|
*/
|
|
static inline unsigned long load_unaligned_zeropad(const void *addr)
|
|
{
|
|
unsigned long data;
|
|
|
|
asm_inline volatile(
|
|
"0: lg %[data],0(%[addr])\n"
|
|
"1: nopr %%r7\n"
|
|
EX_TABLE_ZEROPAD(0b, 1b, %[data], %[addr])
|
|
EX_TABLE_ZEROPAD(1b, 1b, %[data], %[addr])
|
|
: [data] "=d" (data)
|
|
: [addr] "a" (addr), "m" (*(unsigned long *)addr));
|
|
return data;
|
|
}
|
|
|
|
#endif /* _ASM_WORD_AT_A_TIME_H */
|