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/*
 * Bit operations for the Hexagon architecture
 *
 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef _ASM_BITOPS_H
#define _ASM_BITOPS_H

#include <linux/compiler.h>
#include <asm/byteorder.h>
#include <asm/atomic.h>
#include <asm/barrier.h>

#ifdef __KERNEL__

/*
 * The offset calculations for these are based on BITS_PER_LONG == 32
 * (i.e. I get to shift by #5-2 (32 bits per long, 4 bytes per access),
 * mask by 0x0000001F)
 *
 * Typically, R10 is clobbered for address, R11 bit nr, and R12 is temp
 */

/**
 * test_and_clear_bit - clear a bit and return its old value
 * @nr:  bit number to clear
 * @addr:  pointer to memory
 */
static inline int test_and_clear_bit(int nr, volatile void *addr)
{
	int oldval;

	__asm__ __volatile__ (
	"	{R10 = %1; R11 = asr(%2,#5); }\n"
	"	{R10 += asl(R11,#2); R11 = and(%2,#0x1f)}\n"
	"1:	R12 = memw_locked(R10);\n"
	"	{ P0 = tstbit(R12,R11); R12 = clrbit(R12,R11); }\n"
	"	memw_locked(R10,P1) = R12;\n"
	"	{if (!P1) jump 1b; %0 = mux(P0,#1,#0);}\n"
	: "=&r" (oldval)
	: "r" (addr), "r" (nr)
	: "r10", "r11", "r12", "p0", "p1", "memory"
	);

	return oldval;
}

/**
 * test_and_set_bit - set a bit and return its old value
 * @nr:  bit number to set
 * @addr:  pointer to memory
 */
static inline int test_and_set_bit(int nr, volatile void *addr)
{
	int oldval;

	__asm__ __volatile__ (
	"	{R10 = %1; R11 = asr(%2,#5); }\n"
	"	{R10 += asl(R11,#2); R11 = and(%2,#0x1f)}\n"
	"1:	R12 = memw_locked(R10);\n"
	"	{ P0 = tstbit(R12,R11); R12 = setbit(R12,R11); }\n"
	"	memw_locked(R10,P1) = R12;\n"
	"	{if (!P1) jump 1b; %0 = mux(P0,#1,#0);}\n"
	: "=&r" (oldval)
	: "r" (addr), "r" (nr)
	: "r10", "r11", "r12", "p0", "p1", "memory"
	);


	return oldval;

}

/**
 * test_and_change_bit - toggle a bit and return its old value
 * @nr:  bit number to set
 * @addr:  pointer to memory
 */
static inline int test_and_change_bit(int nr, volatile void *addr)
{
	int oldval;

	__asm__ __volatile__ (
	"	{R10 = %1; R11 = asr(%2,#5); }\n"
	"	{R10 += asl(R11,#2); R11 = and(%2,#0x1f)}\n"
	"1:	R12 = memw_locked(R10);\n"
	"	{ P0 = tstbit(R12,R11); R12 = togglebit(R12,R11); }\n"
	"	memw_locked(R10,P1) = R12;\n"
	"	{if (!P1) jump 1b; %0 = mux(P0,#1,#0);}\n"
	: "=&r" (oldval)
	: "r" (addr), "r" (nr)
	: "r10", "r11", "r12", "p0", "p1", "memory"
	);

	return oldval;

}

/*
 * Atomic, but doesn't care about the return value.
 * Rewrite later to save a cycle or two.
 */

static inline void clear_bit(int nr, volatile void *addr)
{
	test_and_clear_bit(nr, addr);
}

static inline void set_bit(int nr, volatile void *addr)
{
	test_and_set_bit(nr, addr);
}

static inline void change_bit(int nr, volatile void *addr)
{
	test_and_change_bit(nr, addr);
}


/*
 * These are allowed to be non-atomic.  In fact the generic flavors are
 * in non-atomic.h.  Would it be better to use intrinsics for this?
 *
 * OK, writes in our architecture do not invalidate LL/SC, so this has to
 * be atomic, particularly for things like slab_lock and slab_unlock.
 *
 */
static inline void __clear_bit(int nr, volatile unsigned long *addr)
{
	test_and_clear_bit(nr, addr);
}

static inline void __set_bit(int nr, volatile unsigned long *addr)
{
	test_and_set_bit(nr, addr);
}

static inline void __change_bit(int nr, volatile unsigned long *addr)
{
	test_and_change_bit(nr, addr);
}

/*  Apparently, at least some of these are allowed to be non-atomic  */
static inline int __test_and_clear_bit(int nr, volatile unsigned long *addr)
{
	return test_and_clear_bit(nr, addr);
}

static inline int __test_and_set_bit(int nr, volatile unsigned long *addr)
{
	return test_and_set_bit(nr, addr);
}

static inline int __test_and_change_bit(int nr, volatile unsigned long *addr)
{
	return test_and_change_bit(nr, addr);
}

static inline int __test_bit(int nr, const volatile unsigned long *addr)
{
	int retval;

	asm volatile(
	"{P0 = tstbit(%1,%2); if (P0.new) %0 = #1; if (!P0.new) %0 = #0;}\n"
	: "=&r" (retval)
	: "r" (addr[BIT_WORD(nr)]), "r" (nr % BITS_PER_LONG)
	: "p0"
	);

	return retval;
}

#define test_bit(nr, addr) __test_bit(nr, addr)

/*
 * ffz - find first zero in word.
 * @word: The word to search
 *
 * Undefined if no zero exists, so code should check against ~0UL first.
 */
static inline long ffz(int x)
{
	int r;

	asm("%0 = ct1(%1);\n"
		: "=&r" (r)
		: "r" (x));
	return r;
}

/*
 * fls - find last (most-significant) bit set
 * @x: the word to search
 *
 * This is defined the same way as ffs.
 * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
 */
static inline int fls(int x)
{
	int r;

	asm("{ %0 = cl0(%1);}\n"
		"%0 = sub(#32,%0);\n"
		: "=&r" (r)
		: "r" (x)
		: "p0");

	return r;
}

/*
 * ffs - find first bit set
 * @x: the word to search
 *
 * This is defined the same way as
 * the libc and compiler builtin ffs routines, therefore
 * differs in spirit from the above ffz (man ffs).
 */
static inline int ffs(int x)
{
	int r;

	asm("{ P0 = cmp.eq(%1,#0); %0 = ct0(%1);}\n"
		"{ if (P0) %0 = #0; if (!P0) %0 = add(%0,#1);}\n"
		: "=&r" (r)
		: "r" (x)
		: "p0");

	return r;
}

/*
 * __ffs - find first bit in word.
 * @word: The word to search
 *
 * Undefined if no bit exists, so code should check against 0 first.
 *
 * bits_per_long assumed to be 32
 * numbering starts at 0 I think (instead of 1 like ffs)
 */
static inline unsigned long __ffs(unsigned long word)
{
	int num;

	asm("%0 = ct0(%1);\n"
		: "=&r" (num)
		: "r" (word));

	return num;
}

/*
 * __fls - find last (most-significant) set bit in a long word
 * @word: the word to search
 *
 * Undefined if no set bit exists, so code should check against 0 first.
 * bits_per_long assumed to be 32
 */
static inline unsigned long __fls(unsigned long word)
{
	int num;

	asm("%0 = cl0(%1);\n"
		"%0 = sub(#31,%0);\n"
		: "=&r" (num)
		: "r" (word));

	return num;
}

#include <asm-generic/bitops/lock.h>
#include <asm-generic/bitops/find.h>

#include <asm-generic/bitops/fls64.h>
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/hweight.h>

#include <asm-generic/bitops/le.h>
#include <asm-generic/bitops/ext2-atomic.h>

#endif /* __KERNEL__ */
#endif

Filemanager

Name Type Size Permission Actions
Kbuild File 886 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 5.27 KB 0644
bitops.h File 6.62 KB 0644
cache.h File 1.16 KB 0644
cacheflush.h File 3.8 KB 0644
checksum.h File 1.61 KB 0644
cmpxchg.h File 2.55 KB 0644
delay.h File 978 B 0644
dma-mapping.h File 1.31 KB 0644
dma.h File 934 B 0644
elf.h File 6.34 KB 0644
exec.h File 1.01 KB 0644
fixmap.h File 1.11 KB 0644
fpu.h File 90 B 0644
futex.h File 2.25 KB 0644
hexagon_vm.h File 6.39 KB 0644
intrinsics.h File 1003 B 0644
io.h File 6.95 KB 0644
irq.h File 1.13 KB 0644
irqflags.h File 1.46 KB 0644
kgdb.h File 1.36 KB 0644
linkage.h File 871 B 0644
mem-layout.h File 3.42 KB 0644
mmu.h File 1.1 KB 0644
mmu_context.h File 2.59 KB 0644
module.h File 910 B 0644
page.h File 4.74 KB 0644
perf_event.h File 841 B 0644
pgalloc.h File 4.08 KB 0644
pgtable.h File 14.15 KB 0644
processor.h File 3.8 KB 0644
smp.h File 1.31 KB 0644
spinlock.h File 3.84 KB 0644
spinlock_types.h File 1.15 KB 0644
string.h File 1.08 KB 0644
suspend.h File 872 B 0644
switch_to.h File 1.09 KB 0644
syscall.h File 1.38 KB 0644
thread_info.h File 4.05 KB 0644
time.h File 980 B 0644
timer-regs.h File 1.23 KB 0644
timex.h File 1.13 KB 0644
tlb.h File 1.21 KB 0644
tlbflush.h File 2.08 KB 0644
traps.h File 1.02 KB 0644
uaccess.h File 3.67 KB 0644
vdso.h File 941 B 0644
vm_fault.h File 993 B 0644
vm_mmu.h File 3.37 KB 0644