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/*
 * include/asm-xtensa/spinlock.h
 *
 * 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.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_SPINLOCK_H
#define _XTENSA_SPINLOCK_H

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

/*
 * spinlock
 *
 * There is at most one owner of a spinlock.  There are not different
 * types of spinlock owners like there are for rwlocks (see below).
 *
 * When trying to obtain a spinlock, the function "spins" forever, or busy-
 * waits, until the lock is obtained.  When spinning, presumably some other
 * owner will soon give up the spinlock making it available to others.  Use
 * the trylock functions to avoid spinning forever.
 *
 * possible values:
 *
 *    0         nobody owns the spinlock
 *    1         somebody owns the spinlock
 */

#define arch_spin_is_locked(x) ((x)->slock != 0)

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

	__asm__ __volatile__(
			"       movi    %0, 0\n"
			"       wsr     %0, scompare1\n"
			"1:     movi    %0, 1\n"
			"       s32c1i  %0, %1, 0\n"
			"       bnez    %0, 1b\n"
			: "=&a" (tmp)
			: "a" (&lock->slock)
			: "memory");
}

/* Returns 1 if the lock is obtained, 0 otherwise. */

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

	__asm__ __volatile__(
			"       movi    %0, 0\n"
			"       wsr     %0, scompare1\n"
			"       movi    %0, 1\n"
			"       s32c1i  %0, %1, 0\n"
			: "=&a" (tmp)
			: "a" (&lock->slock)
			: "memory");

	return tmp == 0 ? 1 : 0;
}

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

	__asm__ __volatile__(
			"       movi    %0, 0\n"
			"       s32ri   %0, %1, 0\n"
			: "=&a" (tmp)
			: "a" (&lock->slock)
			: "memory");
}

/*
 * rwlock
 *
 * Read-write locks are really a more flexible spinlock.  They allow
 * multiple readers but only one writer.  Write ownership is exclusive
 * (i.e., all other readers and writers are blocked from ownership while
 * there is a write owner).  These rwlocks are unfair to writers.  Writers
 * can be starved for an indefinite time by readers.
 *
 * possible values:
 *
 *   0          nobody owns the rwlock
 *  >0          one or more readers own the rwlock
 *                (the positive value is the actual number of readers)
 *  0x80000000  one writer owns the rwlock, no other writers, no readers
 */

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

	__asm__ __volatile__(
			"       movi    %0, 0\n"
			"       wsr     %0, scompare1\n"
			"1:     movi    %0, 1\n"
			"       slli    %0, %0, 31\n"
			"       s32c1i  %0, %1, 0\n"
			"       bnez    %0, 1b\n"
			: "=&a" (tmp)
			: "a" (&rw->lock)
			: "memory");
}

/* Returns 1 if the lock is obtained, 0 otherwise. */

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

	__asm__ __volatile__(
			"       movi    %0, 0\n"
			"       wsr     %0, scompare1\n"
			"       movi    %0, 1\n"
			"       slli    %0, %0, 31\n"
			"       s32c1i  %0, %1, 0\n"
			: "=&a" (tmp)
			: "a" (&rw->lock)
			: "memory");

	return tmp == 0 ? 1 : 0;
}

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

	__asm__ __volatile__(
			"       movi    %0, 0\n"
			"       s32ri   %0, %1, 0\n"
			: "=&a" (tmp)
			: "a" (&rw->lock)
			: "memory");
}

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

	__asm__ __volatile__(
			"1:     l32i    %1, %2, 0\n"
			"       bltz    %1, 1b\n"
			"       wsr     %1, scompare1\n"
			"       addi    %0, %1, 1\n"
			"       s32c1i  %0, %2, 0\n"
			"       bne     %0, %1, 1b\n"
			: "=&a" (result), "=&a" (tmp)
			: "a" (&rw->lock)
			: "memory");
}

/* Returns 1 if the lock is obtained, 0 otherwise. */

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

	__asm__ __volatile__(
			"       l32i    %1, %2, 0\n"
			"       addi    %0, %1, 1\n"
			"       bltz    %0, 1f\n"
			"       wsr     %1, scompare1\n"
			"       s32c1i  %0, %2, 0\n"
			"       sub     %0, %0, %1\n"
			"1:\n"
			: "=&a" (result), "=&a" (tmp)
			: "a" (&rw->lock)
			: "memory");

	return result == 0;
}

static inline void arch_read_unlock(arch_rwlock_t *rw)
{
	unsigned long tmp1, tmp2;

	__asm__ __volatile__(
			"1:     l32i    %1, %2, 0\n"
			"       addi    %0, %1, -1\n"
			"       wsr     %1, scompare1\n"
			"       s32c1i  %0, %2, 0\n"
			"       bne     %0, %1, 1b\n"
			: "=&a" (tmp1), "=&a" (tmp2)
			: "a" (&rw->lock)
			: "memory");
}

#endif	/* _XTENSA_SPINLOCK_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 685 B 0644
asm-offsets.h File 35 B 0644
asm-uaccess.h File 4.11 KB 0644
asmmacro.h File 2.76 KB 0644
atomic.h File 7.38 KB 0644
barrier.h File 542 B 0644
bitops.h File 5.08 KB 0644
bootparam.h File 1.37 KB 0644
bugs.h File 451 B 0644
cache.h File 969 B 0644
cacheasm.h File 3.77 KB 0644
cacheflush.h File 5.76 KB 0644
checksum.h File 6 KB 0644
cmpxchg.h File 3.9 KB 0644
coprocessor.h File 5.05 KB 0644
current.h File 675 B 0644
delay.h File 1.63 KB 0644
dma-mapping.h File 855 B 0644
dma.h File 1.79 KB 0644
elf.h File 5.75 KB 0644
fixmap.h File 2.5 KB 0644
flat.h File 686 B 0644
ftrace.h File 979 B 0644
futex.h File 2.59 KB 0644
highmem.h File 2.33 KB 0644
hw_breakpoint.h File 1.45 KB 0644
hw_irq.h File 320 B 0644
initialize_mmu.h File 4.58 KB 0644
io.h File 2.09 KB 0644
irq.h File 1.46 KB 0644
irqflags.h File 1.99 KB 0644
kmem_layout.h File 2.07 KB 0644
mmu.h File 462 B 0644
mmu_context.h File 3.62 KB 0644
module.h File 525 B 0644
mxregs.h File 1.3 KB 0644
nommu_context.h File 602 B 0644
page.h File 5.69 KB 0644
pci-bridge.h File 2.16 KB 0644
pci.h File 1.37 KB 0644
perf_event.h File 108 B 0644
pgalloc.h File 1.84 KB 0644
pgtable.h File 14.89 KB 0644
platform.h File 1.75 KB 0644
processor.h File 7.44 KB 0644
ptrace.h File 3.74 KB 0644
regs.h File 3.87 KB 0644
segment.h File 376 B 0644
serial.h File 443 B 0644
shmparam.h File 561 B 0644
signal.h File 502 B 0644
smp.h File 967 B 0644
spinlock.h File 4.6 KB 0644
spinlock_types.h File 412 B 0644
stacktrace.h File 1.13 KB 0644
string.h File 2.65 KB 0644
switch_to.h File 601 B 0644
syscall.h File 982 B 0644
sysmem.h File 426 B 0644
thread_info.h File 3.62 KB 0644
timex.h File 1.79 KB 0644
tlb.h File 1.1 KB 0644
tlbflush.h File 5.53 KB 0644
traps.h File 1.87 KB 0644
types.h File 501 B 0644
uaccess.h File 8.67 KB 0644
ucontext.h File 540 B 0644
unaligned.h File 864 B 0644
unistd.h File 639 B 0644
user.h File 507 B 0644
vectors.h File 4.05 KB 0644
vga.h File 434 B 0644