📄 setbit.s
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/* * linux/arch/arm/lib/setbit.S * * Copyright (C) 1995-1996 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */#include <linux/linkage.h>#include <asm/assembler.h> .text/* * Purpose : Function to set a bit * Prototype: int set_bit(int bit, void *addr) */ENTRY(set_bit) and r2, r0, #7 mov r3, #1 mov r3, r3, lsl r2 save_and_disable_irqs ip, r2 ldrb r2, [r1, r0, lsr #3] orr r2, r2, r3 strb r2, [r1, r0, lsr #3] restore_irqs ip RETINSTR(mov,pc,lr)
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