84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/******************************************************************************
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*
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* $RCSfile: interrupt-utils.c,v $
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* $Revision: 1.1 $
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*
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* This module provides the interface routines for setting up and
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* controlling the various interrupt modes present on the ARM processor.
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* Copyright 2004, R O SoftWare
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* No guarantees, warrantees, or promises, implied or otherwise.
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* May be used for hobby or commercial purposes provided copyright
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* notice remains intact.
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*
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*****************************************************************************/
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#include "interrupt-utils.h"
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#define IRQ_MASK 0x00000080
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#define FIQ_MASK 0x00000040
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#define INT_MASK (IRQ_MASK | FIQ_MASK)
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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 */ );
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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) );
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}
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unsigned disableIRQ(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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unsigned restoreIRQ(unsigned oldCPSR)
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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) | (oldCPSR & IRQ_MASK));
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return _cpsr;
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}
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unsigned enableIRQ(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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unsigned disableFIQ(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 | FIQ_MASK);
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return _cpsr;
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}
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unsigned restoreFIQ(unsigned oldCPSR)
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{
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unsigned _cpsr;
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_cpsr = __get_cpsr();
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__set_cpsr((_cpsr & ~FIQ_MASK) | (oldCPSR & FIQ_MASK));
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return _cpsr;
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}
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unsigned enableFIQ(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 & ~FIQ_MASK);
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return _cpsr;
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}
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