diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/include/sys/mmio.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/sys/include/sys/mmio.h b/sys/include/sys/mmio.h index 8e3db52..334b31c 100644 --- a/sys/include/sys/mmio.h +++ b/sys/include/sys/mmio.h @@ -62,6 +62,24 @@ } /* + * mmio_read<n> - Does the same as mmio_write<n> but for reading + * + * @addr: Address to read from. + */ +#define _MMIO_READ_TYPE(TYPE, SUFFIX) \ + static inline TYPE \ + mmio_read##SUFFIX(void *addr, TYPE val) \ + { \ + uintptr_t tmp; \ + \ + tmp = (uintptr_t)addr; \ + if (tmp < VM_HIGHER_HALF) { \ + tmp += VM_HIGHER_HALF; \ + } \ + return *(volatile TYPE *)tmp; \ + } + +/* * To write to an MMIO address of, for example, * 8 bits, use mmio_write8(addr, val) */ @@ -73,4 +91,16 @@ _MMIO_WRITE_TYPE(uint64_t, 64) #endif __extension__ +/* + * To read from an MMIO address of, for example, + * 8 bits, use mmio_read8(addr) + */ +_MMIO_READ_TYPE(uint8_t, 8) +_MMIO_READ_TYPE(uint16_t, 16) +_MMIO_READ_TYPE(uint32_t, 32) +#if __SIZEOF_SIZE_T__ == 8 +_MMIO_READ_TYPE(uint64_t, 64) +#endif +__extension__ + #endif /* !_SYS_MMIO_H_ */ |