bitops.h

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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>

#ifdef __KERNEL__

#define smp_mb__before_clear_bit()  barrier()
#define smp_mb__after_clear_bit()   barrier()

/*
 * 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
 */

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;
}

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;

}

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 long 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 long 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