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kernel/linux-imx6_3.14.28/include/asm-generic/io-64-nonatomic-hi-lo.h 536 Bytes
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  #ifndef _ASM_IO_64_NONATOMIC_HI_LO_H_
  #define _ASM_IO_64_NONATOMIC_HI_LO_H_
  
  #include <linux/io.h>
  #include <asm-generic/int-ll64.h>
  
  #ifndef readq
  static inline __u64 readq(const volatile void __iomem *addr)
  {
  	const volatile u32 __iomem *p = addr;
  	u32 low, high;
  
  	high = readl(p + 1);
  	low = readl(p);
  
  	return low + ((u64)high << 32);
  }
  #endif
  
  #ifndef writeq
  static inline void writeq(__u64 val, volatile void __iomem *addr)
  {
  	writel(val >> 32, addr + 4);
  	writel(val, addr);
  }
  #endif
  
  #endif	/* _ASM_IO_64_NONATOMIC_HI_LO_H_ */