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84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
/*
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* Copyright (C) 2005, 2006, 2007, 2008 by Thomas Hillebrandt and Heiko Will
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_arm7_common
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* @{
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*
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* @file
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* @brief Implementation of the kernels irq interface
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*
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* @author Heiko Will <hwill@inf.fu-berlin.de>
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*/
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#ifndef IRQ_ARCH_H
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#define IRQ_ARCH_H
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#include "VIC.h"
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define IRQ_MASK 0x00000080
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static inline unsigned __get_cpsr(void)
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{
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unsigned long retval;
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__asm__ volatile(" mrs %0, cpsr" : "=r"(retval) : /* no inputs */ : "memory");
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return retval;
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}
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static inline void __set_cpsr(unsigned val)
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{
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__asm__ volatile(" msr cpsr, %0" : /* no outputs */ : "r"(val) : "memory");
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}
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static inline bool irq_is_in(void)
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{
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int retval;
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__asm__ volatile(" mrs %0, cpsr" : "=r"(retval) : /* no inputs */ : "memory");
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return (retval & INTMode) == 18;
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}
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static inline __attribute__((always_inline)) unsigned irq_disable(void)
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{
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unsigned _cpsr;
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_cpsr = __get_cpsr();
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__set_cpsr(_cpsr | IRQ_MASK);
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return _cpsr;
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}
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static inline __attribute__((always_inline)) void irq_restore(unsigned oldCPSR)
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{
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__set_cpsr(oldCPSR);
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}
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static inline __attribute__((always_inline)) unsigned irq_enable(void)
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{
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unsigned _cpsr;
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_cpsr = __get_cpsr();
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__set_cpsr(_cpsr & ~IRQ_MASK);
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return _cpsr;
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}
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static inline __attribute__((always_inline)) bool irq_is_enabled(void)
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{
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return !(__get_cpsr() & IRQ_MASK);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* IRQ_ARCH_H */
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/** @} */
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