generic: Add new file generic/io.h and move read/writeb() to it

Move the definitions of the readb() style functions to a new header
generic/io.h.  This eliminates the dependency of stdint.h on
compiler.h.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/generic/io.h b/src/generic/io.h
new file mode 100644
index 00000000..2a16cf20
--- /dev/null
+++ b/src/generic/io.h
@@ -0,0 +1,25 @@
+#ifndef __GENERIC_IO_H
+#define __GENERIC_IO_H
+
+#include <stdint.h> // uint32_t
+
+static inline void writel(void *addr, uint32_t val) {
+    *(volatile uint32_t *)addr = val;
+}
+static inline void writew(void *addr, uint16_t val) {
+    *(volatile uint16_t *)addr = val;
+}
+static inline void writeb(void *addr, uint8_t val) {
+    *(volatile uint8_t *)addr = val;
+}
+static inline uint32_t readl(const void *addr) {
+    return *(volatile const uint32_t *)addr;
+}
+static inline uint16_t readw(const void *addr) {
+    return *(volatile const uint16_t *)addr;
+}
+static inline uint8_t readb(const void *addr) {
+    return *(volatile const uint8_t *)addr;
+}
+
+#endif // io.h