From: Russell King Date: Mon, 18 Apr 2005 21:50:01 +0000 (+0100) Subject: [PATCH] ARM: Add missing new file for bitops patch X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7a55fd0bb31eb369149b89fdf9e0c7bc73486ee1;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [PATCH] ARM: Add missing new file for bitops patch Signed-off-by: Russell King --- diff --git a/arch/arm/lib/bitops.h b/arch/arm/lib/bitops.h new file mode 100644 index 000000000000..4a83ab6cd565 --- /dev/null +++ b/arch/arm/lib/bitops.h @@ -0,0 +1,33 @@ + .macro bitop, instr + and r2, r0, #7 + mov r3, #1 + mov r3, r3, lsl r2 + save_and_disable_irqs ip, r2 + ldrb r2, [r1, r0, lsr #3] + \instr r2, r2, r3 + strb r2, [r1, r0, lsr #3] + restore_irqs ip + mov pc, lr + .endm + +/** + * testop - implement a test_and_xxx_bit operation. + * @instr: operational instruction + * @store: store instruction + * + * Note: we can trivially conditionalise the store instruction + * to avoid dirting the data cache. + */ + .macro testop, instr, store + add r1, r1, r0, lsr #3 + and r3, r0, #7 + mov r0, #1 + save_and_disable_irqs ip, r2 + ldrb r2, [r1] + tst r2, r0, lsl r3 + \instr r2, r2, r0, lsl r3 + \store r2, [r1] + restore_irqs ip + moveq r0, #0 + mov pc, lr + .endm