FreeCalypso > hg > freecalypso-citrine

annotate bsp/irq_twiddle.S @ 26:51e1a3b213a3

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started re-adding documentation
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Jun 2016 07:01:34 +0000
parents 75a11d740a02
children
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1 /*
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2 * TI's L1 code (and possibly other parts of the software suite) calls
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3 * functions named INT_DisableIRQ() and INT_EnableIRQ(); in the Leonardo
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4 * fw they are implemented (in a very ugly manner, as usual) in the
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5 * int.s entry point assembly module. Here we implement the same
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6 * functions in a cleaner way.
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7 */
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9 #include "../nucleus/asm_defs.h"
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11 .code 32
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12 .text
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14 .globl INT_DisableIRQ
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15 INT_DisableIRQ:
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16 mrs r0, CPSR
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17 orr r0, r0, #LOCKOUT
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18 msr CPSR, r0
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19 bx lr
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21 .globl INT_EnableIRQ
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22 INT_EnableIRQ:
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23 mrs r0, CPSR
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24 bic r0, r0, #LOCKOUT
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25 msr CPSR, r0
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26 bx lr