1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <asm/assembler.h> 3 #include <asm/unwind.h> 4 5 #if __LINUX_ARM_ARCH__ >= 6 6 .macro bitop, name, instr 7 ENTRY( \name ) 8 UNWIND( .fnstart ) 9 ands ip, r1, #3 10 strbne r1, [ip] @ assert word-aligned 11 mov r2, #1 12 and r3, r0, #31 @ Get bit offset 13 mov r0, r0, lsr #5 14 add r1, r1, r0, lsl #2 @ Get word offset 15 #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP) 16 .arch_extension mp 17 ALT_SMP(W(pldw) [r1]) 18 ALT_UP(W(nop)) 19 #endif 20 mov r3, r2, lsl r3 21 1: ldrex r2, [r1] 22 \instr r2, r2, r3 23 strex r0, r2, [r1] 24 cmp r0, #0 25 bne 1b 26 bx lr 27 UNWIND( .fnend ) 28 ENDPROC(\name ) 29 .endm 30 31 .macro __testop, name, instr, store, barrier 32 ENTRY( \name ) 33 UNWIND( .fnstart ) 34 ands ip, r1, #3 35 strbne r1, [ip] @ assert word-aligned 36 mov r2, #1 37 and r3, r0, #31 @ Get bit offset 38 mov r0, r0, lsr #5 39 add r1, r1, r0, lsl #2 @ Get word offset 40 mov r3, r2, lsl r3 @ create mask 41 \barrier 42 #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP) 43 .arch_extension mp 44 ALT_SMP(W(pldw) [r1]) 45 ALT_UP(W(nop)) 46 #endif 47 1: ldrex r2, [r1] 48 ands r0, r2, r3 @ save old value of bit 49 \instr r2, r2, r3 @ toggle bit 50 strex ip, r2, [r1] 51 cmp ip, #0 52 bne 1b 53 \barrier 54 cmp r0, #0 55 movne r0, #1 56 2: bx lr 57 UNWIND( .fnend ) 58 ENDPROC(\name ) 59 .endm 60 61 .macro testop, name, instr, store 62 __testop \name, \instr, \store, smp_dmb 63 .endm 64 65 .macro sync_testop, name, instr, store 66 __testop \name, \instr, \store, __smp_dmb 67 .endm 68 #else 69 .macro bitop, name, instr 70 ENTRY( \name ) 71 UNWIND( .fnstart ) 72 ands ip, r1, #3 73 strbne r1, [ip] @ assert word-aligned 74 and r2, r0, #31 75 mov r0, r0, lsr #5 76 mov r3, #1 77 mov r3, r3, lsl r2 78 save_and_disable_irqs ip 79 ldr r2, [r1, r0, lsl #2] 80 \instr r2, r2, r3 81 str r2, [r1, r0, lsl #2] 82 restore_irqs ip 83 ret lr 84 UNWIND( .fnend ) 85 ENDPROC(\name ) 86 .endm 87 88 /** 89 * testop - implement a test_and_xxx_bit operation. 90 * @instr: operational instruction 91 * @store: store instruction 92 * 93 * Note: we can trivially conditionalise the store instruction 94 * to avoid dirtying the data cache. 95 */ 96 .macro testop, name, instr, store 97 ENTRY( \name ) 98 UNWIND( .fnstart ) 99 ands ip, r1, #3 100 strbne r1, [ip] @ assert word-aligned 101 and r3, r0, #31 102 mov r0, r0, lsr #5 103 save_and_disable_irqs ip 104 ldr r2, [r1, r0, lsl #2]! 105 mov r0, #1 106 tst r2, r0, lsl r3 107 \instr r2, r2, r0, lsl r3 108 \store r2, [r1] 109 moveq r0, #0 110 restore_irqs ip 111 ret lr 112 UNWIND( .fnend ) 113 ENDPROC(\name ) 114 .endm 115 #endif 116
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