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148 lines
3.8 KiB
148 lines
3.8 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (c) 1994-1997, 99, 2000, 06, 07 Ralf Baechle ([email protected]) |
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* Copyright (c) 1999, 2000 Silicon Graphics, Inc. |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/bits.h> |
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#include <linux/irqflags.h> |
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#include <linux/export.h> |
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/** |
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* __mips_set_bit - Atomically set a bit in memory. This is called by |
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* set_bit() if it cannot find a faster solution. |
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* @nr: the bit to set |
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* @addr: the address to start counting from |
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*/ |
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void __mips_set_bit(unsigned long nr, volatile unsigned long *addr) |
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{ |
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volatile unsigned long *a = &addr[BIT_WORD(nr)]; |
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unsigned int bit = nr % BITS_PER_LONG; |
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unsigned long mask; |
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unsigned long flags; |
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mask = 1UL << bit; |
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raw_local_irq_save(flags); |
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*a |= mask; |
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raw_local_irq_restore(flags); |
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} |
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EXPORT_SYMBOL(__mips_set_bit); |
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/** |
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* __mips_clear_bit - Clears a bit in memory. This is called by clear_bit() if |
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* it cannot find a faster solution. |
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* @nr: Bit to clear |
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* @addr: Address to start counting from |
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*/ |
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void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr) |
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{ |
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volatile unsigned long *a = &addr[BIT_WORD(nr)]; |
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unsigned int bit = nr % BITS_PER_LONG; |
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unsigned long mask; |
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unsigned long flags; |
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mask = 1UL << bit; |
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raw_local_irq_save(flags); |
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*a &= ~mask; |
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raw_local_irq_restore(flags); |
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} |
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EXPORT_SYMBOL(__mips_clear_bit); |
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/** |
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* __mips_change_bit - Toggle a bit in memory. This is called by change_bit() |
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* if it cannot find a faster solution. |
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* @nr: Bit to change |
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* @addr: Address to start counting from |
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*/ |
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void __mips_change_bit(unsigned long nr, volatile unsigned long *addr) |
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{ |
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volatile unsigned long *a = &addr[BIT_WORD(nr)]; |
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unsigned int bit = nr % BITS_PER_LONG; |
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unsigned long mask; |
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unsigned long flags; |
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mask = 1UL << bit; |
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raw_local_irq_save(flags); |
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*a ^= mask; |
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raw_local_irq_restore(flags); |
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} |
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EXPORT_SYMBOL(__mips_change_bit); |
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/** |
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* __mips_test_and_set_bit_lock - Set a bit and return its old value. This is |
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* called by test_and_set_bit_lock() if it cannot find a faster solution. |
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* @nr: Bit to set |
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* @addr: Address to count from |
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*/ |
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int __mips_test_and_set_bit_lock(unsigned long nr, |
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volatile unsigned long *addr) |
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{ |
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volatile unsigned long *a = &addr[BIT_WORD(nr)]; |
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unsigned int bit = nr % BITS_PER_LONG; |
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unsigned long mask; |
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unsigned long flags; |
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int res; |
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mask = 1UL << bit; |
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raw_local_irq_save(flags); |
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res = (mask & *a) != 0; |
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*a |= mask; |
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raw_local_irq_restore(flags); |
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return res; |
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} |
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EXPORT_SYMBOL(__mips_test_and_set_bit_lock); |
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/** |
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* __mips_test_and_clear_bit - Clear a bit and return its old value. This is |
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* called by test_and_clear_bit() if it cannot find a faster solution. |
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* @nr: Bit to clear |
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* @addr: Address to count from |
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*/ |
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int __mips_test_and_clear_bit(unsigned long nr, volatile unsigned long *addr) |
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{ |
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volatile unsigned long *a = &addr[BIT_WORD(nr)]; |
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unsigned int bit = nr % BITS_PER_LONG; |
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unsigned long mask; |
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unsigned long flags; |
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int res; |
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mask = 1UL << bit; |
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raw_local_irq_save(flags); |
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res = (mask & *a) != 0; |
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*a &= ~mask; |
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raw_local_irq_restore(flags); |
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return res; |
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} |
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EXPORT_SYMBOL(__mips_test_and_clear_bit); |
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/** |
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* __mips_test_and_change_bit - Change a bit and return its old value. This is |
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* called by test_and_change_bit() if it cannot find a faster solution. |
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* @nr: Bit to change |
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* @addr: Address to count from |
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*/ |
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int __mips_test_and_change_bit(unsigned long nr, volatile unsigned long *addr) |
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{ |
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volatile unsigned long *a = &addr[BIT_WORD(nr)]; |
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unsigned int bit = nr % BITS_PER_LONG; |
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unsigned long mask; |
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unsigned long flags; |
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int res; |
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mask = 1UL << bit; |
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raw_local_irq_save(flags); |
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res = (mask & *a) != 0; |
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*a ^= mask; |
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raw_local_irq_restore(flags); |
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return res; |
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} |
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EXPORT_SYMBOL(__mips_test_and_change_bit);
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