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/*
 * include/asm-sh/spinlock-llsc.h
 *
 * Copyright (C) 2002, 2003 Paul Mundt
 * Copyright (C) 2006, 2007 Akio Idehara
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#ifndef __ASM_SH_SPINLOCK_LLSC_H
#define __ASM_SH_SPINLOCK_LLSC_H

#include <asm/barrier.h>
#include <asm/processor.h>

/*
 * Your basic SMP spinlocks, allowing only a single CPU anywhere
 */

#define arch_spin_is_locked(x)		((x)->lock <= 0)

/*
 * Simple spin lock operations.  There are two variants, one clears IRQ's
 * on the local processor, one does not.
 *
 * We make no fairness assumptions.  They have a cost.
 */
static inline void arch_spin_lock(arch_spinlock_t *lock)
{
	unsigned long tmp;
	unsigned long oldval;

	__asm__ __volatile__ (
		"1:						\n\t"
		"movli.l	@%2, %0	! arch_spin_lock	\n\t"
		"mov		%0, %1				\n\t"
		"mov		#0, %0				\n\t"
		"movco.l	%0, @%2				\n\t"
		"bf		1b				\n\t"
		"cmp/pl		%1				\n\t"
		"bf		1b				\n\t"
		: "=&z" (tmp), "=&r" (oldval)
		: "r" (&lock->lock)
		: "t", "memory"
	);
}

static inline void arch_spin_unlock(arch_spinlock_t *lock)
{
	unsigned long tmp;

	__asm__ __volatile__ (
		"mov		#1, %0 ! arch_spin_unlock	\n\t"
		"mov.l		%0, @%1				\n\t"
		: "=&z" (tmp)
		: "r" (&lock->lock)
		: "t", "memory"
	);
}

static inline int arch_spin_trylock(arch_spinlock_t *lock)
{
	unsigned long tmp, oldval;

	__asm__ __volatile__ (
		"1:						\n\t"
		"movli.l	@%2, %0	! arch_spin_trylock	\n\t"
		"mov		%0, %1				\n\t"
		"mov		#0, %0				\n\t"
		"movco.l	%0, @%2				\n\t"
		"bf		1b				\n\t"
		"synco						\n\t"
		: "=&z" (tmp), "=&r" (oldval)
		: "r" (&lock->lock)
		: "t", "memory"
	);

	return oldval;
}

/*
 * Read-write spinlocks, allowing multiple readers but only one writer.
 *
 * NOTE! it is quite common to have readers in interrupts but no interrupt
 * writers. For those circumstances we can "mix" irq-safe locks - any writer
 * needs to get a irq-safe write-lock, but readers can get non-irqsafe
 * read-locks.
 */

static inline void arch_read_lock(arch_rwlock_t *rw)
{
	unsigned long tmp;

	__asm__ __volatile__ (
		"1:						\n\t"
		"movli.l	@%1, %0	! arch_read_lock	\n\t"
		"cmp/pl		%0				\n\t"
		"bf		1b				\n\t"
		"add		#-1, %0				\n\t"
		"movco.l	%0, @%1				\n\t"
		"bf		1b				\n\t"
		: "=&z" (tmp)
		: "r" (&rw->lock)
		: "t", "memory"
	);
}

static inline void arch_read_unlock(arch_rwlock_t *rw)
{
	unsigned long tmp;

	__asm__ __volatile__ (
		"1:						\n\t"
		"movli.l	@%1, %0	! arch_read_unlock	\n\t"
		"add		#1, %0				\n\t"
		"movco.l	%0, @%1				\n\t"
		"bf		1b				\n\t"
		: "=&z" (tmp)
		: "r" (&rw->lock)
		: "t", "memory"
	);
}

static inline void arch_write_lock(arch_rwlock_t *rw)
{
	unsigned long tmp;

	__asm__ __volatile__ (
		"1:						\n\t"
		"movli.l	@%1, %0	! arch_write_lock	\n\t"
		"cmp/hs		%2, %0				\n\t"
		"bf		1b				\n\t"
		"sub		%2, %0				\n\t"
		"movco.l	%0, @%1				\n\t"
		"bf		1b				\n\t"
		: "=&z" (tmp)
		: "r" (&rw->lock), "r" (RW_LOCK_BIAS)
		: "t", "memory"
	);
}

static inline void arch_write_unlock(arch_rwlock_t *rw)
{
	__asm__ __volatile__ (
		"mov.l		%1, @%0 ! arch_write_unlock	\n\t"
		:
		: "r" (&rw->lock), "r" (RW_LOCK_BIAS)
		: "t", "memory"
	);
}

static inline int arch_read_trylock(arch_rwlock_t *rw)
{
	unsigned long tmp, oldval;

	__asm__ __volatile__ (
		"1:						\n\t"
		"movli.l	@%2, %0	! arch_read_trylock	\n\t"
		"mov		%0, %1				\n\t"
		"cmp/pl		%0				\n\t"
		"bf		2f				\n\t"
		"add		#-1, %0				\n\t"
		"movco.l	%0, @%2				\n\t"
		"bf		1b				\n\t"
		"2:						\n\t"
		"synco						\n\t"
		: "=&z" (tmp), "=&r" (oldval)
		: "r" (&rw->lock)
		: "t", "memory"
	);

	return (oldval > 0);
}

static inline int arch_write_trylock(arch_rwlock_t *rw)
{
	unsigned long tmp, oldval;

	__asm__ __volatile__ (
		"1:						\n\t"
		"movli.l	@%2, %0	! arch_write_trylock	\n\t"
		"mov		%0, %1				\n\t"
		"cmp/hs		%3, %0				\n\t"
		"bf		2f				\n\t"
		"sub		%3, %0				\n\t"
		"2:						\n\t"
		"movco.l	%0, @%2				\n\t"
		"bf		1b				\n\t"
		"synco						\n\t"
		: "=&z" (tmp), "=&r" (oldval)
		: "r" (&rw->lock), "r" (RW_LOCK_BIAS)
		: "t", "memory"
	);

	return (oldval > (RW_LOCK_BIAS - 1));
}

#endif /* __ASM_SH_SPINLOCK_LLSC_H */

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Name Type Size Permission Actions
Kbuild File 467 B 0644
adc.h File 253 B 0644
addrspace.h File 2.03 KB 0644
alignment.h File 654 B 0644
asm-offsets.h File 35 B 0644
atomic-grb.h File 2.6 KB 0644
atomic-irq.h File 1.63 KB 0644
atomic-llsc.h File 2.12 KB 0644
atomic.h File 1.78 KB 0644
barrier.h File 1.52 KB 0644
bitops-cas.h File 1.73 KB 0644
bitops-grb.h File 6.21 KB 0644
bitops-llsc.h File 2.79 KB 0644
bitops-op32.h File 3.78 KB 0644
bitops.h File 2.38 KB 0644
bl_bit.h File 216 B 0644
bl_bit_32.h File 639 B 0644
bl_bit_64.h File 979 B 0644
bug.h File 2.77 KB 0644
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cacheflush.h File 3.58 KB 0644
checksum.h File 140 B 0644
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clock.h File 436 B 0644
cmpxchg-cas.h File 549 B 0644
cmpxchg-grb.h File 2.8 KB 0644
cmpxchg-irq.h File 1.04 KB 0644
cmpxchg-llsc.h File 1.06 KB 0644
cmpxchg-xchg.h File 1.33 KB 0644
cmpxchg.h File 1.77 KB 0644
device.h File 450 B 0644
dma-mapping.h File 694 B 0644
dma-register.h File 1.8 KB 0644
dma.h File 3.74 KB 0644
dmabrg.h File 536 B 0644
dwarf.h File 9.8 KB 0644
elf.h File 7.28 KB 0644
entry-macros.S File 1.85 KB 0644
extable.h File 227 B 0644
fb.h File 375 B 0644
fixmap.h File 2.92 KB 0644
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fpu.h File 1.77 KB 0644
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ftrace.h File 1.11 KB 0644
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futex-irq.h File 482 B 0644
futex-llsc.h File 870 B 0644
futex.h File 1.5 KB 0644
gpio.h File 1017 B 0644
hardirq.h File 440 B 0644
hd64461.h File 11.79 KB 0644
heartbeat.h File 383 B 0644
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i2c-sh7760.h File 406 B 0644
io.h File 11.33 KB 0644
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irq.h File 1.68 KB 0644
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kmap_types.h File 265 B 0644
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machvec.h File 939 B 0644
mmu.h File 2.18 KB 0644
mmu_context.h File 4.44 KB 0644
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mmzone.h File 1.1 KB 0644
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pci.h File 3.19 KB 0644
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processor.h File 4.41 KB 0644
processor_32.h File 4.67 KB 0644
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ptrace.h File 3.39 KB 0644
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push-switch.h File 755 B 0644
reboot.h File 472 B 0644
romimage-macros.h File 1.1 KB 0644
rtc.h File 383 B 0644
seccomp.h File 280 B 0644
sections.h File 307 B 0644
segment.h File 879 B 0644
setup.h File 725 B 0644
sfp-machine.h File 3.43 KB 0644
sh7760fb.h File 5.61 KB 0644
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spinlock-cas.h File 2.09 KB 0644
spinlock-llsc.h File 4.13 KB 0644
spinlock.h File 578 B 0644
spinlock_types.h File 463 B 0644
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