HevCompiler: Init.

src/misc/hev-compiler.h

@@ -0,0 +1,106 @@
+/*
+ ============================================================================
+ Name : hev-compiler.h
+ Author : Heiher <[email protected]>
+ Copyright : Copyright (c) 2019 everyone.
+ Description : Compiler
+ ============================================================================
+ */
+
+#ifndef __HEV_COMPILER_H__
+#define __HEV_COMPILER_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define ALIGN_UP(addr, align) \
+ ((addr + (typeof (addr))align - 1) & ~((typeof (addr))align - 1))
+
+#define ALIGN_DOWN(addr, align) ((addr) & ~((typeof (addr))align - 1))
+
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(x) (sizeof (x) / sizeof (x[0]))
+#endif
+
+#ifndef EXPORT_SYMBOL
+#define EXPORT_SYMBOL __attribute__ ((visibility ("default")))
+#endif
+
+#define barrier() __asm__ __volatile__("" : : : "memory")
+
+static inline void
+__read_once_size (void *dst, const volatile void *src, int size)
+{
+ switch (size) {
+ case sizeof (char):
+ *(char *)dst = *(volatile char *)src;
+ break;
+ case sizeof (short):
+ *(short *)dst = *(volatile short *)src;
+ break;
+ case sizeof (int):
+ *(int *)dst = *(volatile int *)src;
+ break;
+ default:
+ barrier ();
+ __builtin_memcpy ((void *)dst, (const void *)src, size);
+ barrier ();
+ }
+}
+
+static inline void
+__write_once_size (volatile void *dst, const void *src, int size)
+{
+ switch (size) {
+ case sizeof (char):
+ *(volatile char *)dst = *(char *)src;
+ break;
+ case sizeof (short):
+ *(volatile short *)dst = *(short *)src;
+ break;
+ case sizeof (int):
+ *(volatile int *)dst = *(int *)src;
+ break;
+ default:
+ barrier ();
+ __builtin_memcpy ((void *)dst, (const void *)src, size);
+ barrier ();
+ }
+}
+
+#define READ_ONCE(x) \
+ ({ \
+ union \
+ { \
+ typeof (x) __val; \
+ char __c[1]; \
+ } __u; \
+ __read_once_size (__u.__c, &(x), sizeof (x)); \
+ __u.__val; \
+ })
+
+#define WRITE_ONCE(x, val) \
+ ({ \
+ union \
+ { \
+ typeof (x) __val; \
+ char __c[1]; \
+ } __u = { .__val = (typeof (x)) (val) }; \
+ __write_once_size (&(x), __u.__c, sizeof (x)); \
+ __u.__val; \
+ })
+
+#ifndef container_of
+#define container_of(ptr, type, member) \
+ ({ \
+ void *__mptr = (void *)(ptr); \
+ ((type *)(__mptr - offsetof (type, member))); \
+ })
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __HEV_COMPILER_H__ */