Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #ifndef __ASM_SH_CMPXCHG_XCHG_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #define __ASM_SH_CMPXCHG_XCHG_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Copyright (C) 2016 Red Hat, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Author: Michael S. Tsirkin <mst@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/bits.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/byteorder.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * Portable implementations of 1 and 2 byte xchg using a 4 byte cmpxchg.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * Note: this header isn't self-contained: before including it, __cmpxchg_u32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * must be defined first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static inline u32 __xchg_cmpxchg(volatile void *ptr, u32 x, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	int off = (unsigned long)ptr % sizeof(u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	volatile u32 *p = ptr - off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #ifdef __BIG_ENDIAN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	int bitoff = (sizeof(u32) - size - off) * BITS_PER_BYTE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	int bitoff = off * BITS_PER_BYTE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	u32 bitmask = ((0x1 << size * BITS_PER_BYTE) - 1) << bitoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	u32 oldv, newv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	u32 ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		oldv = READ_ONCE(*p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		ret = (oldv & bitmask) >> bitoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		newv = (oldv & ~bitmask) | (x << bitoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	} while (__cmpxchg_u32(p, oldv, newv) != oldv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static inline unsigned long xchg_u16(volatile u16 *m, unsigned long val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	return __xchg_cmpxchg(m, val, sizeof *m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	return __xchg_cmpxchg(m, val, sizeof *m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #endif /* __ASM_SH_CMPXCHG_XCHG_H */