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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2010 by Michael Sevakis
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/***************************************************************************
* void bitmod32(volatile uint32_t *addr, uint32_t bits, uint32_t mask)
*/
.section .text, "ax", %progbits
.align 2
.global bitmod32
.type bitmod32, %function
bitmod32:
mrs r12, cpsr
cpsid if
ldr r3, [r0]
and r1, r1, r2 @ Only allow mod of bits in 'mask'
bic r3, r3, r2 @ Clear mask bits
orr r3, r3, r1 @ Set according to 'bits'
str r3, [r0]
msr cpsr_c, r12
bx lr
.size bitmod32, .-bitmod32
/***************************************************************************
* void bitset32(volatile uint32_t *addr, uint32_t mask)
*/
.section .text, "ax", %progbits
.align 2
.global bitset32
.type bitset32, %function
bitset32:
mrs r12, cpsr
cpsid if
ldr r2, [r0]
orr r2, r2, r1
str r2, [r0]
msr cpsr_c, r12
bx lr
.size bitset32, .-bitset32
/***************************************************************************
* void bitclr32(volatile uint32_t *addr, uint32_t mask)
*/
.section .text, "ax", %progbits
.align 2
.global bitclr32
.type bitclr32, %function
bitclr32:
mrs r12, cpsr
cpsid if
ldr r2, [r0]
bic r2, r2, r1
str r2, [r0]
msr cpsr_c, r12
bx lr
.size bitclr32, .-bitclr32
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