43 lines
762 B
C
43 lines
762 B
C
#include "lpc2220.hh"
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#include "irq.h"
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#define IRQ_MASK 0x00000080
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static inline unsigned asm_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 asm_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 enableIRQ(void)
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{
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unsigned _cpsr;
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_cpsr = asm_get_cpsr();
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asm_set_cpsr(_cpsr & ~IRQ_MASK);
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return _cpsr;
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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 = asm_get_cpsr();
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asm_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 = asm_get_cpsr();
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asm_set_cpsr((_cpsr & ~IRQ_MASK) | (oldCPSR & IRQ_MASK));
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return _cpsr;
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}
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