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/*
 * 1,2 and 4 byte cmpxchg and xchg implementations for OpenRISC.
 *
 * Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
 * Copyright (C) 2017 Stafford Horne <shorne@gmail.com>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2.  This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 *
 * Note:
 * The portable implementations of 1 and 2 byte xchg and cmpxchg using a 4
 * byte cmpxchg is sourced heavily from the sh and mips implementations.
 */

#ifndef __ASM_OPENRISC_CMPXCHG_H
#define __ASM_OPENRISC_CMPXCHG_H

#include  <linux/types.h>
#include  <linux/bitops.h>

#define __HAVE_ARCH_CMPXCHG 1

static inline unsigned long cmpxchg_u32(volatile void *ptr,
		unsigned long old, unsigned long new)
{
	__asm__ __volatile__(
		"1:	l.lwa %0, 0(%1)		\n"
		"	l.sfeq %0, %2		\n"
		"	l.bnf 2f		\n"
		"	 l.nop			\n"
		"	l.swa 0(%1), %3		\n"
		"	l.bnf 1b		\n"
		"	 l.nop			\n"
		"2:				\n"
		: "=&r"(old)
		: "r"(ptr), "r"(old), "r"(new)
		: "cc", "memory");

	return old;
}

static inline unsigned long xchg_u32(volatile void *ptr,
		unsigned long val)
{
	__asm__ __volatile__(
		"1:	l.lwa %0, 0(%1)		\n"
		"	l.swa 0(%1), %2		\n"
		"	l.bnf 1b		\n"
		"	 l.nop			\n"
		: "=&r"(val)
		: "r"(ptr), "r"(val)
		: "cc", "memory");

	return val;
}

static inline u32 cmpxchg_small(volatile void *ptr, u32 old, u32 new,
				int size)
{
	int off = (unsigned long)ptr % sizeof(u32);
	volatile u32 *p = ptr - off;
#ifdef __BIG_ENDIAN
	int bitoff = (sizeof(u32) - size - off) * BITS_PER_BYTE;
#else
	int bitoff = off * BITS_PER_BYTE;
#endif
	u32 bitmask = ((0x1 << size * BITS_PER_BYTE) - 1) << bitoff;
	u32 load32, old32, new32;
	u32 ret;

	load32 = READ_ONCE(*p);

	while (true) {
		ret = (load32 & bitmask) >> bitoff;
		if (old != ret)
			return ret;

		old32 = (load32 & ~bitmask) | (old << bitoff);
		new32 = (load32 & ~bitmask) | (new << bitoff);

		/* Do 32 bit cmpxchg */
		load32 = cmpxchg_u32(p, old32, new32);
		if (load32 == old32)
			return old;
	}
}

/* xchg */

static inline u32 xchg_small(volatile void *ptr, u32 x, int size)
{
	int off = (unsigned long)ptr % sizeof(u32);
	volatile u32 *p = ptr - off;
#ifdef __BIG_ENDIAN
	int bitoff = (sizeof(u32) - size - off) * BITS_PER_BYTE;
#else
	int bitoff = off * BITS_PER_BYTE;
#endif
	u32 bitmask = ((0x1 << size * BITS_PER_BYTE) - 1) << bitoff;
	u32 oldv, newv;
	u32 ret;

	do {
		oldv = READ_ONCE(*p);
		ret = (oldv & bitmask) >> bitoff;
		newv = (oldv & ~bitmask) | (x << bitoff);
	} while (cmpxchg_u32(p, oldv, newv) != oldv);

	return ret;
}

/*
 * This function doesn't exist, so you'll get a linker error
 * if something tries to do an invalid cmpxchg().
 */
extern unsigned long __cmpxchg_called_with_bad_pointer(void)
	__compiletime_error("Bad argument size for cmpxchg");

static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
		unsigned long new, int size)
{
	switch (size) {
	case 1:
	case 2:
		return cmpxchg_small(ptr, old, new, size);
	case 4:
		return cmpxchg_u32(ptr, old, new);
	default:
		return __cmpxchg_called_with_bad_pointer();
	}
}

#define cmpxchg(ptr, o, n)						\
	({								\
		(__typeof__(*(ptr))) __cmpxchg((ptr),			\
					       (unsigned long)(o),	\
					       (unsigned long)(n),	\
					       sizeof(*(ptr)));		\
	})

/*
 * This function doesn't exist, so you'll get a linker error if
 * something tries to do an invalidly-sized xchg().
 */
extern unsigned long __xchg_called_with_bad_pointer(void)
	__compiletime_error("Bad argument size for xchg");

static inline unsigned long __xchg(volatile void *ptr, unsigned long with,
		int size)
{
	switch (size) {
	case 1:
	case 2:
		return xchg_small(ptr, with, size);
	case 4:
		return xchg_u32(ptr, with);
	default:
		return __xchg_called_with_bad_pointer();
	}
}

#define xchg(ptr, with) 						\
	({								\
		(__typeof__(*(ptr))) __xchg((ptr),			\
					    (unsigned long)(with),	\
					    sizeof(*(ptr)));		\
	})

#endif /* __ASM_OPENRISC_CMPXCHG_H */

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Name Type Size Permission Actions
bitops Folder 0755
Kbuild File 997 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 3.02 KB 0644
barrier.h File 203 B 0644
bitops.h File 1.5 KB 0644
cache.h File 888 B 0644
cacheflush.h File 3.37 KB 0644
cmpxchg.h File 3.92 KB 0644
cpuinfo.h File 970 B 0644
delay.h File 670 B 0644
dma-mapping.h File 968 B 0644
elf.h File 2.02 KB 0644
fixmap.h File 2.74 KB 0644
futex.h File 2.24 KB 0644
io.h File 1.31 KB 0644
irq.h File 835 B 0644
irqflags.h File 866 B 0644
linkage.h File 764 B 0644
mmu.h File 728 B 0644
mmu_context.h File 1.3 KB 0644
page.h File 2.54 KB 0644
pgalloc.h File 2.57 KB 0644
pgtable.h File 13.96 KB 0644
processor.h File 2.7 KB 0644
ptrace.h File 3.33 KB 0644
serial.h File 1.11 KB 0644
smp.h File 822 B 0644
spinlock.h File 985 B 0644
spinlock_types.h File 188 B 0644
spr.h File 1.17 KB 0644
spr_defs.h File 22.91 KB 0644
string.h File 324 B 0644
syscall.h File 1.91 KB 0644
syscalls.h File 1.04 KB 0644
thread_info.h File 3.85 KB 0644
time.h File 627 B 0644
timex.h File 914 B 0644
tlb.h File 1.01 KB 0644
tlbflush.h File 2.05 KB 0644
uaccess.h File 7.98 KB 0644
unaligned.h File 1.7 KB 0644
unwinder.h File 557 B 0644