include/minix/mmio.h

   1 #ifndef __MMIO_H__
   2 #define __MMIO_H__
   3
   4 #define REG(x)(*((volatile uint32_t *)(x)))
   5 #define BIT(x)(0x1 << x)
   6
   7 /* Write a uint32_t value to a memory address. */
   8 static inline void
   9 write32(uint32_t address, uint32_t value)
  10 {
  11         REG(address) = value;
  12 }
  13
  14 /* Read an uint32_t from a memory address */
  15 static inline uint32_t
  16 read32(uint32_t address)
  17 {
  18         return REG(address);
  19 }
  20
  21 /* Set a 32 bits value depending on a mask */
  22 static inline void
  23 set32(uint32_t address, uint32_t mask, uint32_t value)
  24 {
  25         uint32_t val;
  26         val = read32(address);
  27         /* clear the bits */
  28         val &= ~(mask);
  29         /* apply the value using the mask */
  30         val |= (value & mask);
  31         write32(address, val);
  32 }
  33 #endif /* __MMIO_H__ */