Added kernel-level abstraction over the spi interface.

1 files changed, 11 insertions, 14 deletions

diff --git a/include/kern/common.h b/include/kern/common.h
index c5afe3f..021229b 100644
--- a/include/kern/common.h
+++ b/include/kern/common.h
@@ -1,9 +1,11 @@
 #ifndef COMMON__H
 #define COMMON__H
 
-#include <stdint.h>
-#include <stddef.h>
 #include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+
+typedef enum { ENDIANNESS_LITTLE, ENDIANNESS_BIG } endianness_t;
 
 #define WEAK __attribute__((weak))
 #define NORETURN __attribute__((noreturn))
@@ -28,23 +30,18 @@
 #define PACKED __attribute__((packed))
 #define BIT(n) (1 << (n))
 
-#define RESERVED_CONCAT_IMPL(x, y) x ## y
+#define RESERVED_CONCAT_IMPL(x, y) x##y
 #define RESERVED_MACRO_CONCAT(x, y) RESERVED_CONCAT_IMPL(x, y)
-#define RESERVED(n) \
-  bits_t RESERVED_MACRO_CONCAT(_r, __COUNTER__) :n
-  
-#define RESERVE(type) \
-  __IO type RESERVED_MACRO_CONCAT(_r, __COUNTER__)
+#define RESERVED(n) bits_t RESERVED_MACRO_CONCAT(_r, __COUNTER__) : n
+
+#define RESERVE(type) __IO type RESERVED_MACRO_CONCAT(_r, __COUNTER__)
 
-#define ptr2reg(ptr) \
-  ((uint32_t) (ptrdiff_t) (ptr))
+#define ptr2reg(ptr) ((uint32_t)(ptrdiff_t)(ptr))
 
 typedef __IO uint32_t bits_t;
 
-#define regset(reg, mask, val) \
-  ((reg) = ((reg) & ~mask) | (val << CTZ(mask)))
+#define regset(reg, mask, val) ((reg) = ((reg) & ~mask) | (val << CTZ(mask)))
 
-#define regget(reg, mask) \
-  (((reg) & mask) >> (CTZ(mask)))
+#define regget(reg, mask) (((reg)&mask) >> (CTZ(mask)))
 
 #endif /* COMMON_H */