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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | /* bitops.S: Low level assembler bit operations. * * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) */ #include <linux/config.h> #include <asm/cprefix.h> #include <asm/ptrace.h> #include <asm/psr.h> .text .align 4 .globl __bitops_begin __bitops_begin: /* Take bits in %g2 and set them in word at %g1, * return whether bits were set in original value * in %g2. %g4 holds value to restore into %o7 * in delay slot of jmpl return, %g3 + %g5 + %g7 can be * used as temporaries and thus is considered clobbered * by all callers. */ .globl ___set_bit ___set_bit: rd %psr, %g3 nop; nop; nop; or %g3, PSR_PIL, %g5 wr %g5, 0x0, %psr nop; nop; nop #ifdef CONFIG_SMP set C_LABEL(bitops_spinlock), %g5 2: ldstub [%g5], %g7 ! Spin on the byte lock for SMP. orcc %g7, 0x0, %g0 ! Did we get it? bne 2b ! Nope... #endif ld [%g1], %g7 or %g7, %g2, %g5 and %g7, %g2, %g2 #ifdef CONFIG_SMP st %g5, [%g1] set C_LABEL(bitops_spinlock), %g5 stb %g0, [%g5] #else st %g5, [%g1] #endif wr %g3, 0x0, %psr nop; nop; nop jmpl %o7, %g0 mov %g4, %o7 /* Same as above, but clears the bits from %g2 instead. */ .globl ___clear_bit ___clear_bit: rd %psr, %g3 nop; nop; nop or %g3, PSR_PIL, %g5 wr %g5, 0x0, %psr nop; nop; nop #ifdef CONFIG_SMP set C_LABEL(bitops_spinlock), %g5 2: ldstub [%g5], %g7 ! Spin on the byte lock for SMP. orcc %g7, 0x0, %g0 ! Did we get it? bne 2b ! Nope... #endif ld [%g1], %g7 andn %g7, %g2, %g5 and %g7, %g2, %g2 #ifdef CONFIG_SMP st %g5, [%g1] set C_LABEL(bitops_spinlock), %g5 stb %g0, [%g5] #else st %g5, [%g1] #endif wr %g3, 0x0, %psr nop; nop; nop jmpl %o7, %g0 mov %g4, %o7 /* Same thing again, but this time toggles the bits from %g2. */ .globl ___change_bit ___change_bit: rd %psr, %g3 nop; nop; nop or %g3, PSR_PIL, %g5 wr %g5, 0x0, %psr nop; nop; nop #ifdef CONFIG_SMP set C_LABEL(bitops_spinlock), %g5 2: ldstub [%g5], %g7 ! Spin on the byte lock for SMP. orcc %g7, 0x0, %g0 ! Did we get it? bne 2b ! Nope... #endif ld [%g1], %g7 xor %g7, %g2, %g5 and %g7, %g2, %g2 #ifdef CONFIG_SMP st %g5, [%g1] set C_LABEL(bitops_spinlock), %g5 stb %g0, [%g5] #else st %g5, [%g1] #endif wr %g3, 0x0, %psr nop; nop; nop jmpl %o7, %g0 mov %g4, %o7 .globl __bitops_end __bitops_end: |