1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
145 lines
2.8 KiB
ArmAsm
145 lines
2.8 KiB
ArmAsm
/* $Id: bitops.S,v 1.3 2001/11/18 00:12:56 davem Exp $
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* bitops.S: Sparc64 atomic bit operations.
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*
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* Copyright (C) 2000 David S. Miller (davem@redhat.com)
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*/
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#include <linux/config.h>
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#include <asm/asi.h>
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/* On SMP we need to use memory barriers to ensure
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* correct memory operation ordering, nop these out
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* for uniprocessor.
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*/
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#ifdef CONFIG_SMP
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#define BITOP_PRE_BARRIER membar #StoreLoad | #LoadLoad
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#define BITOP_POST_BARRIER membar #StoreLoad | #StoreStore
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#else
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#define BITOP_PRE_BARRIER nop
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#define BITOP_POST_BARRIER nop
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#endif
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.text
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.globl test_and_set_bit
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.type test_and_set_bit,#function
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test_and_set_bit: /* %o0=nr, %o1=addr */
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BITOP_PRE_BARRIER
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srlx %o0, 6, %g1
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mov 1, %o2
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sllx %g1, 3, %g3
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and %o0, 63, %g2
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sllx %o2, %g2, %o2
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add %o1, %g3, %o1
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1: ldx [%o1], %g7
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or %g7, %o2, %g1
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casx [%o1], %g7, %g1
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cmp %g7, %g1
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bne,pn %xcc, 1b
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and %g7, %o2, %g2
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BITOP_POST_BARRIER
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clr %o0
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retl
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movrne %g2, 1, %o0
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.size test_and_set_bit, .-test_and_set_bit
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.globl test_and_clear_bit
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.type test_and_clear_bit,#function
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test_and_clear_bit: /* %o0=nr, %o1=addr */
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BITOP_PRE_BARRIER
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srlx %o0, 6, %g1
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mov 1, %o2
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sllx %g1, 3, %g3
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and %o0, 63, %g2
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sllx %o2, %g2, %o2
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add %o1, %g3, %o1
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1: ldx [%o1], %g7
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andn %g7, %o2, %g1
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casx [%o1], %g7, %g1
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cmp %g7, %g1
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bne,pn %xcc, 1b
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and %g7, %o2, %g2
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BITOP_POST_BARRIER
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clr %o0
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retl
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movrne %g2, 1, %o0
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.size test_and_clear_bit, .-test_and_clear_bit
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.globl test_and_change_bit
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.type test_and_change_bit,#function
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test_and_change_bit: /* %o0=nr, %o1=addr */
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BITOP_PRE_BARRIER
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srlx %o0, 6, %g1
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mov 1, %o2
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sllx %g1, 3, %g3
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and %o0, 63, %g2
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sllx %o2, %g2, %o2
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add %o1, %g3, %o1
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1: ldx [%o1], %g7
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xor %g7, %o2, %g1
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casx [%o1], %g7, %g1
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cmp %g7, %g1
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bne,pn %xcc, 1b
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and %g7, %o2, %g2
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BITOP_POST_BARRIER
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clr %o0
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retl
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movrne %g2, 1, %o0
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.size test_and_change_bit, .-test_and_change_bit
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.globl set_bit
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.type set_bit,#function
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set_bit: /* %o0=nr, %o1=addr */
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srlx %o0, 6, %g1
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mov 1, %o2
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sllx %g1, 3, %g3
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and %o0, 63, %g2
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sllx %o2, %g2, %o2
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add %o1, %g3, %o1
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1: ldx [%o1], %g7
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or %g7, %o2, %g1
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casx [%o1], %g7, %g1
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cmp %g7, %g1
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bne,pn %xcc, 1b
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nop
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retl
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nop
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.size set_bit, .-set_bit
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.globl clear_bit
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.type clear_bit,#function
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clear_bit: /* %o0=nr, %o1=addr */
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srlx %o0, 6, %g1
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mov 1, %o2
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sllx %g1, 3, %g3
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and %o0, 63, %g2
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sllx %o2, %g2, %o2
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add %o1, %g3, %o1
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1: ldx [%o1], %g7
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andn %g7, %o2, %g1
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casx [%o1], %g7, %g1
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cmp %g7, %g1
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bne,pn %xcc, 1b
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nop
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retl
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nop
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.size clear_bit, .-clear_bit
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.globl change_bit
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.type change_bit,#function
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change_bit: /* %o0=nr, %o1=addr */
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srlx %o0, 6, %g1
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mov 1, %o2
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sllx %g1, 3, %g3
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and %o0, 63, %g2
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sllx %o2, %g2, %o2
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add %o1, %g3, %o1
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1: ldx [%o1], %g7
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xor %g7, %o2, %g1
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casx [%o1], %g7, %g1
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cmp %g7, %g1
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bne,pn %xcc, 1b
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nop
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retl
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nop
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.size change_bit, .-change_bit
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