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https://github.com/stargieg/bacnet-stack
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98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
/* ********************************************************************************************** */
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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 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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#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(
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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(
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unsigned val)
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{
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asm volatile (
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" msr cpsr, %0": /* no outputs */ :"r" (val));
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}
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unsigned disableIRQ(
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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(
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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(
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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(
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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(
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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(
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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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