text: #ifndef __IRQ_H
  #define __IRQ_H
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  
  #define CSR_MSTATUS_MIE 0x8
  
  #define CSR_IRQ_MASK 0xBC0
  #define CSR_IRQ_PENDING 0xFC0
  
  #define CSR_DCACHE_INFO 0xCC0
  
  #define csrr(reg) ({ unsigned long __tmp; \
    asm volatile ("csrr %0, " #reg : "=r"(__tmp)); \
    __tmp; })
  
  #define csrw(reg, val) ({ \
    if (__builtin_constant_p(val) && (unsigned long)(val) < 32) \
  	asm volatile ("csrw " #reg ", %0" :: "i"(val)); \
    else \
  	asm volatile ("csrw " #reg ", %0" :: "r"(val)); })
  
  #define csrs(reg, bit) ({ \
    if (__builtin_constant_p(bit) && (unsigned long)(bit) < 32) \
  	asm volatile ("csrrs x0, " #reg ", %0" :: "i"(bit)); \
    else \
  	asm volatile ("csrrs x0, " #reg ", %0" :: "r"(bit)); })
  
  #define csrc(reg, bit) ({ \
    if (__builtin_constant_p(bit) && (unsigned long)(bit) < 32) \
  	asm volatile ("csrrc x0, " #reg ", %0" :: "i"(bit)); \
    else \
  	asm volatile ("csrrc x0, " #reg ", %0" :: "r"(bit)); })
  
  static inline unsigned int irq_getie(void)
  {
  	return (csrr(mstatus) & CSR_MSTATUS_MIE) != 0;
  }
  
  static inline void irq_setie(unsigned int ie)
  {
  	if(ie) csrs(mstatus,CSR_MSTATUS_MIE); else csrc(mstatus,CSR_MSTATUS_MIE);
  }
  
  static inline unsigned int irq_getmask(void)
  {
  	unsigned int mask;
  	asm volatile ("csrr %0, %1" : "=r"(mask) : "i"(CSR_IRQ_MASK));
  	return mask;
  }
  
  static inline void irq_setmask(unsigned int mask)
  {
  	asm volatile ("csrw %0, %1" :: "i"(CSR_IRQ_MASK), "r"(mask));
  }
  
  static inline unsigned int irq_pending(void)
  {
  	unsigned int pending;
  	asm volatile ("csrr %0, %1" : "=r"(pending) : "i"(CSR_IRQ_PENDING));
  	return pending;
  }
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* __IRQ_H */