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/* MN10300 spinlock support
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#ifndef _ASM_SPINLOCK_H
#define _ASM_SPINLOCK_H

#include <linux/atomic.h>
#include <asm/barrier.h>
#include <asm/processor.h>
#include <asm/rwlock.h>
#include <asm/page.h>

/*
 * 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.
 */

#define arch_spin_is_locked(x)	(*(volatile signed char *)(&(x)->slock) != 0)

static inline void arch_spin_unlock(arch_spinlock_t *lock)
{
	asm volatile(
		"	bclr	1,(0,%0)	\n"
		:
		: "a"(&lock->slock)
		: "memory", "cc");
}

static inline int arch_spin_trylock(arch_spinlock_t *lock)
{
	int ret;

	asm volatile(
		"	mov	1,%0		\n"
		"	bset	%0,(%1)		\n"
		"	bne	1f		\n"
		"	clr	%0		\n"
		"1:	xor	1,%0		\n"
		: "=d"(ret)
		: "a"(&lock->slock)
		: "memory", "cc");

	return ret;
}

static inline void arch_spin_lock(arch_spinlock_t *lock)
{
	asm volatile(
		"1:	bset	1,(0,%0)	\n"
		"	bne	1b		\n"
		:
		: "a"(&lock->slock)
		: "memory", "cc");
}

static inline void arch_spin_lock_flags(arch_spinlock_t *lock,
					 unsigned long flags)
{
	int temp;

	asm volatile(
		"1:	bset	1,(0,%2)	\n"
		"	beq	3f		\n"
		"	mov	%1,epsw		\n"
		"2:	mov	(0,%2),%0	\n"
		"	or	%0,%0		\n"
		"	bne	2b		\n"
		"	mov	%3,%0		\n"
		"	mov	%0,epsw		\n"
		"	nop			\n"
		"	nop			\n"
		"	bra	1b\n"
		"3:				\n"
		: "=&d" (temp)
		: "d" (flags), "a"(&lock->slock), "i"(EPSW_IE | MN10300_CLI_LEVEL)
		: "memory", "cc");
}
#define arch_spin_lock_flags	arch_spin_lock_flags

#ifdef __KERNEL__

/*
 * 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.
 */

/*
 * On mn10300, we implement read-write locks as a 32-bit counter
 * with the high bit (sign) being the "contended" bit.
 */
static inline void arch_read_lock(arch_rwlock_t *rw)
{
#if 0 //def CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
	__build_read_lock(rw, "__read_lock_failed");
#else
	{
		atomic_t *count = (atomic_t *)rw;
		while (atomic_dec_return(count) < 0)
			atomic_inc(count);
	}
#endif
}

static inline void arch_write_lock(arch_rwlock_t *rw)
{
#if 0 //def CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
	__build_write_lock(rw, "__write_lock_failed");
#else
	{
		atomic_t *count = (atomic_t *)rw;
		while (!atomic_sub_and_test(RW_LOCK_BIAS, count))
			atomic_add(RW_LOCK_BIAS, count);
	}
#endif
}

static inline void arch_read_unlock(arch_rwlock_t *rw)
{
#if 0 //def CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
	__build_read_unlock(rw);
#else
	{
		atomic_t *count = (atomic_t *)rw;
		atomic_inc(count);
	}
#endif
}

static inline void arch_write_unlock(arch_rwlock_t *rw)
{
#if 0 //def CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
	__build_write_unlock(rw);
#else
	{
		atomic_t *count = (atomic_t *)rw;
		atomic_add(RW_LOCK_BIAS, count);
	}
#endif
}

static inline int arch_read_trylock(arch_rwlock_t *lock)
{
	atomic_t *count = (atomic_t *)lock;
	atomic_dec(count);
	if (atomic_read(count) >= 0)
		return 1;
	atomic_inc(count);
	return 0;
}

static inline int arch_write_trylock(arch_rwlock_t *lock)
{
	atomic_t *count = (atomic_t *)lock;
	if (atomic_sub_and_test(RW_LOCK_BIAS, count))
		return 1;
	atomic_add(RW_LOCK_BIAS, count);
	return 0;
}

#define _raw_spin_relax(lock)	cpu_relax()
#define _raw_read_relax(lock)	cpu_relax()
#define _raw_write_relax(lock)	cpu_relax()

#endif /* __KERNEL__ */
#endif /* _ASM_SPINLOCK_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 314 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 4.02 KB 0644
bitops.h File 5.42 KB 0644
bug.h File 864 B 0644
bugs.h File 561 B 0644
busctl-regs.h File 7.8 KB 0644
cache.h File 2.06 KB 0644
cacheflush.h File 7.6 KB 0644
checksum.h File 2.09 KB 0644
cmpxchg.h File 2.65 KB 0644
cpu-regs.h File 16.61 KB 0644
current.h File 922 B 0644
debugger.h File 1.2 KB 0644
delay.h File 597 B 0644
div64.h File 3.21 KB 0644
dma-mapping.h File 636 B 0644
dma.h File 3.09 KB 0644
dmactl-regs.h File 532 B 0644
elf.h File 4.49 KB 0644
emergency-restart.h File 43 B 0644
exceptions.h File 4.74 KB 0644
fpu.h File 3.57 KB 0644
frame.inc File 2.37 KB 0644
ftrace.h File 12 B 0644
futex.h File 31 B 0644
gdb-stub.h File 5.42 KB 0644
hardirq.h File 1.68 KB 0644
highmem.h File 3.01 KB 0644
hw_irq.h File 483 B 0644
intctl-regs.h File 2.26 KB 0644
io.h File 7.67 KB 0644
irq.h File 1.11 KB 0644
irq_regs.h File 751 B 0644
irqflags.h File 4.05 KB 0644
kdebug.h File 561 B 0644
kgdb.h File 1.7 KB 0644
kmap_types.h File 160 B 0644
kprobes.h File 1.59 KB 0644
linkage.h File 593 B 0644
local.h File 31 B 0644
local64.h File 33 B 0644
mc146818rtc.h File 26 B 0644
mmu.h File 434 B 0644
mmu_context.h File 4.44 KB 0644
module.h File 677 B 0644
nmi.h File 500 B 0644
page.h File 3.63 KB 0644
page_offset.h File 302 B 0644
pci.h File 2.17 KB 0644
percpu.h File 32 B 0644
pgalloc.h File 1.49 KB 0644
pgtable.h File 15.68 KB 0644
pio-regs.h File 7.53 KB 0644
processor.h File 4.12 KB 0644
ptrace.h File 805 B 0644
reset-regs.h File 1.8 KB 0644
rtc-regs.h File 3.57 KB 0644
rtc.h File 692 B 0644
rwlock.h File 2.98 KB 0644
serial-regs.h File 8.85 KB 0644
serial.h File 1.02 KB 0644
setup.h File 574 B 0644
shmparam.h File 182 B 0644
signal.h File 888 B 0644
smp.h File 3.06 KB 0644
smsc911x.h File 27 B 0644
spinlock.h File 3.84 KB 0644
spinlock_types.h File 445 B 0644
string.h File 1.03 KB 0644
switch_to.h File 1.49 KB 0644
syscall.h File 2.38 KB 0644
termios.h File 387 B 0644
thread_info.h File 4.36 KB 0644
timer-regs.h File 20.72 KB 0644
timex.h File 843 B 0644
tlb.h File 941 B 0644
tlbflush.h File 3.45 KB 0644
topology.h File 34 B 0644
types.h File 620 B 0644
uaccess.h File 7.78 KB 0644
ucontext.h File 673 B 0644
unaligned.h File 678 B 0644
unistd.h File 1.34 KB 0644
user.h File 1.91 KB 0644
vga.h File 471 B 0644
xor.h File 29 B 0644