New upstream version 17.11.5

[deb_dpdk.git] / lib / librte_eal / common / include / rte_common.h

diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index 1afc66e..4485d63 100644 (file)
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -51,6 +51,8 @@ extern "C" {
 #include <errno.h>
 #include <limits.h>
 
+#include <rte_config.h>
+
 #ifndef typeof
 #define typeof __typeof__
 #endif
@@ -108,6 +110,29 @@ typedef uint16_t unaligned_uint16_t;
  */
 #define RTE_SET_USED(x) (void)(x)
 
+/**
+ * Run function before main() with low priority.
+ *
+ * The constructor will be run after prioritized constructors.
+ *
+ * @param func
+ *   Constructor function.
+ */
+#define RTE_INIT(func) \
+static void __attribute__((constructor, used)) func(void)
+
+/**
+ * Run function before main() with high priority.
+ *
+ * @param func
+ *   Constructor function.
+ * @param prio
+ *   Priority number must be above 100.
+ *   Lowest number is the first to run.
+ */
+#define RTE_INIT_PRIO(func, prio) \
+static void __attribute__((constructor(prio), used)) func(void)
+
 /**
  * Force a function to be inlined
  */
@@ -216,16 +241,7 @@ rte_is_aligned(void *ptr, unsigned align)
 /**
  * Triggers an error at compilation time if the condition is true.
  */
-#ifndef __OPTIMIZE__
 #define RTE_BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
-#else
-extern int RTE_BUILD_BUG_ON_detected_error;
-#define RTE_BUILD_BUG_ON(condition) do {             \
-       ((void)sizeof(char[1 - 2*!!(condition)]));   \
-       if (condition)                               \
-               RTE_BUILD_BUG_ON_detected_error = 1; \
-} while(0)
-#endif
 
 /*********** Macros to work with powers of 2 ********/
 
@@ -324,7 +340,7 @@ rte_align64pow2(uint64_t v)
 static inline uint32_t
 rte_bsf32(uint32_t v)
 {
-       return __builtin_ctz(v);
+       return (uint32_t)__builtin_ctz(v);
 }
 
 /**
@@ -344,6 +360,25 @@ rte_log2_u32(uint32_t v)
        return rte_bsf32(v);
 }
 
+
+/**
+ * Return the last (most-significant) bit set.
+ *
+ * @note The last (most significant) bit is at position 32.
+ * @note rte_fls_u32(0) = 0, rte_fls_u32(1) = 1, rte_fls_u32(0x80000000) = 32
+ *
+ * @param x
+ *     The input parameter.
+ * @return
+ *     The last (most-significant) bit set, or 0 if the input is 0.
+ */
+static inline int
+rte_fls_u32(uint32_t x)
+{
+       return (x == 0) ? 0 : 32 - __builtin_clz(x);
+}
+
+
 #ifndef offsetof
 /** Return the offset of a field in a structure. */
 #define offsetof(TYPE, MEMBER)  __builtin_offsetof (TYPE, MEMBER)