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