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add 8-bit and 16-bit MMIO read/write functions

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Howard Mao
2017-06-27 10:03:42 -07:00
parent 6e3a173c93
commit b9ffcadc20
1 changed files with 24 additions and 0 deletions
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24
tests/mmio.h
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@@ -3,6 +3,30 @@
#include <stdint.h>
static inline void reg_write8(uintptr_t addr, uint8_t data)
{
volatile uint8_t *ptr = (volatile uint8_t *) addr;
*ptr = data;
}
static inline uint8_t reg_read8(uintptr_t addr)
{
volatile uint8_t *ptr = (volatile uint8_t *) addr;
return *ptr;
}
static inline void reg_write16(uintptr_t addr, uint16_t data)
{
volatile uint16_t *ptr = (volatile uint16_t *) addr;
*ptr = data;
}
static inline uint16_t reg_read16(uintptr_t addr)
{
volatile uint16_t *ptr = (volatile uint16_t *) addr;
return *ptr;
}
static inline void reg_write32(uintptr_t addr, uint32_t data)
{
volatile uint32_t *ptr = (volatile uint32_t *) addr;