Steve Karg
fdd49f1791
* Added pretty-apps and pretty-ports make targets * pretty-fied apps folder C files * Pretty-fied ports folder C and H files Co-authored-by: Steve Karg <skarg@users.sourceforge.net>
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/* **********************************************************************************************
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*/
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/* */
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/* File Name : isr.c */
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/* Title : interrupt enable/disable functions */
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/* */
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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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/* Note from Jim Lynch: */
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/* This module was developed by Bill Knight, RO Software and used with his
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* permission. */
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/* Taken from the Yahoo LPC2000 User's Group - Files Section 'UT050418A.ZIP' */
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/* Specifically, the module armVIC.c with the include file references removed
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*/
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/* **********************************************************************************************
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*/
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#include "at91sam7s256.h"
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#include "isr.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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