summaryrefslogtreecommitdiff
path: root/kern/macros.h
diff options
context:
space:
mode:
Diffstat (limited to 'kern/macros.h')
-rw-r--r--kern/macros.h72
1 files changed, 72 insertions, 0 deletions
diff --git a/kern/macros.h b/kern/macros.h
new file mode 100644
index 0000000..fb8dc5e
--- /dev/null
+++ b/kern/macros.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2009, 2010, 2013 Richard Braun.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * Helper macros.
+ */
+
+#ifndef _KERN_MACROS_H
+#define _KERN_MACROS_H
+
+#define MACRO_BEGIN ({
+#define MACRO_END })
+#define MACRO_RETURN if (1) return
+
+#define __QUOTE(x) #x
+#define QUOTE(x) __QUOTE(x)
+
+#ifdef __ASSEMBLER__
+#define DECL_CONST(x, s) x
+#else /* __ASSEMBLER__ */
+#define __DECL_CONST(x, s) x##s
+#define DECL_CONST(x, s) __DECL_CONST(x, s)
+#endif /* __ASSEMBLER__ */
+
+#define STRLEN(x) (sizeof(x) - 1)
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+
+#define DIV_CEIL(n, d) (((n) + (d) - 1) / (d))
+
+#define P2ALIGNED(x, a) (((x) & ((a) - 1)) == 0)
+#define ISP2(x) P2ALIGNED(x, x)
+#define P2ALIGN(x, a) ((x) & -(a))
+#define P2ROUND(x, a) (-(-(x) & -(a)))
+#define P2END(x, a) (-(~(x) & -(a)))
+
+#define structof(ptr, type, member) \
+ ((type *)((char *)(ptr) - offsetof(type, member)))
+
+#define alignof(x) __alignof__(x)
+
+#define likely(expr) __builtin_expect(!!(expr), 1)
+#define unlikely(expr) __builtin_expect(!!(expr), 0)
+
+#define barrier() asm volatile("" : : : "memory")
+
+#define __noreturn __attribute__((noreturn))
+#define __aligned(x) __attribute__((aligned(x)))
+#define __always_inline inline __attribute__((always_inline))
+#define __section(x) __attribute__((section(x)))
+#define __packed __attribute__((packed))
+#define __alias(x) __attribute__((alias(x)))
+
+#define __format_printf(fmt, args) \
+ __attribute__((format(printf, fmt, args)))
+
+#endif /* _KERN_MACROS_H */