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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163/* * 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) 1994-1997, 99, 2000, 06, 07 Ralf Baechle (ralf@linux-mips.org) * Copyright (c) 1999, 2000 Silicon Graphics, Inc. */#include <linux/bitops.h>#include <linux/bits.h>#include <linux/irqflags.h>#include <linux/export.h>
/** * __mips_set_bit - Atomically set a bit in memory. This is called by * set_bit() if it cannot find a faster solution. * @nr: the bit to set * @addr: the address to start counting from */void __mips_set_bit(unsigned long nr, volatile unsigned long *addr){ volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags;
mask = 1UL << bit; raw_local_irq_save(flags); *a |= mask; raw_local_irq_restore(flags);}EXPORT_SYMBOL(__mips_set_bit);
/** * __mips_clear_bit - Clears a bit in memory. This is called by clear_bit() if * it cannot find a faster solution. * @nr: Bit to clear * @addr: Address to start counting from */void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr){ volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags;
mask = 1UL << bit; raw_local_irq_save(flags); *a &= ~mask; raw_local_irq_restore(flags);}EXPORT_SYMBOL(__mips_clear_bit);
/** * __mips_change_bit - Toggle a bit in memory. This is called by change_bit() * if it cannot find a faster solution. * @nr: Bit to change * @addr: Address to start counting from */void __mips_change_bit(unsigned long nr, volatile unsigned long *addr){ volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags;
mask = 1UL << bit; raw_local_irq_save(flags); *a ^= mask; raw_local_irq_restore(flags);}EXPORT_SYMBOL(__mips_change_bit);
/** * __mips_test_and_set_bit_lock - Set a bit and return its old value. This is * called by test_and_set_bit_lock() if it cannot find a faster solution. * @nr: Bit to set * @addr: Address to count from */int __mips_test_and_set_bit_lock(unsigned long nr, volatile unsigned long *addr){ volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags; int res;
mask = 1UL << bit; raw_local_irq_save(flags); res = (mask & *a) != 0; *a |= mask; raw_local_irq_restore(flags); return res;}EXPORT_SYMBOL(__mips_test_and_set_bit_lock);
/** * __mips_test_and_clear_bit - Clear a bit and return its old value. This is * called by test_and_clear_bit() if it cannot find a faster solution. * @nr: Bit to clear * @addr: Address to count from */int __mips_test_and_clear_bit(unsigned long nr, volatile unsigned long *addr){ volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags; int res;
mask = 1UL << bit; raw_local_irq_save(flags); res = (mask & *a) != 0; *a &= ~mask; raw_local_irq_restore(flags); return res;}EXPORT_SYMBOL(__mips_test_and_clear_bit);
/** * __mips_test_and_change_bit - Change a bit and return its old value. This is * called by test_and_change_bit() if it cannot find a faster solution. * @nr: Bit to change * @addr: Address to count from */int __mips_test_and_change_bit(unsigned long nr, volatile unsigned long *addr){ volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags; int res;
mask = 1UL << bit; raw_local_irq_save(flags); res = (mask & *a) != 0; *a ^= mask; raw_local_irq_restore(flags); return res;}EXPORT_SYMBOL(__mips_test_and_change_bit);
bool __mips_xor_is_negative_byte(unsigned long mask, volatile unsigned long *addr){ unsigned long flags; unsigned long data;
raw_local_irq_save(flags); data = *addr; *addr = data ^ mask; raw_local_irq_restore(flags);
return (data & BIT(7)) != 0;}