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// Copyright © 2015 Jeff Epler <jepler@unpythonic.net>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// 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 RTAPI_BITOPS_H
#define RTAPI_BITOPS_H
#if defined(__KERNEL__)
#include <asm/bitops.h>
#else
#include <limits.h>
#define RTAPI_LONG_BIT (CHAR_BIT * sizeof(unsigned long))
static __inline__ void set_bit(int nr, volatile void *addr) {
size_t loff = nr / RTAPI_LONG_BIT;
size_t boff = nr % RTAPI_LONG_BIT;
unsigned long *laddr = (unsigned long*)addr;
__sync_fetch_and_or(laddr + loff, 1lu << boff);
}
static __inline__ int test_bit(int nr, const volatile void *addr) {
size_t loff = nr / RTAPI_LONG_BIT;
size_t boff = nr % RTAPI_LONG_BIT;
unsigned long *laddr = (unsigned long*)addr;
return (laddr[loff] & (1lu << boff)) != 0;
}
static __inline__ void clear_bit(int nr, volatile void *addr) {
size_t loff = nr / RTAPI_LONG_BIT;
size_t boff = nr % RTAPI_LONG_BIT;
unsigned long *laddr = (unsigned long*)addr;
__sync_fetch_and_and(laddr + loff, ~(1lu << boff));
}
static __inline__ long test_and_set_bit(int nr, volatile void *addr) {
size_t loff = nr / RTAPI_LONG_BIT;
size_t boff = nr % RTAPI_LONG_BIT;
unsigned long *laddr = (unsigned long*)addr;
unsigned long oldval = __sync_fetch_and_or(laddr + loff, 1lu << boff);
return (oldval & (1lu << boff)) != 0;
}
static __inline__ long test_and_clear_bit(int nr, volatile void *addr) {
size_t loff = nr / RTAPI_LONG_BIT;
size_t boff = nr % RTAPI_LONG_BIT;
unsigned long *laddr = (unsigned long*)addr;
unsigned long oldval = __sync_fetch_and_and(laddr + loff, ~(1lu << boff));
return (oldval & (1lu << boff)) != 0;
}
#endif
#endif
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