lib/librte_eal/common/include/arch/x86/rte_byteorder.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #ifndef _RTE_BYTEORDER_X86_H_
   6 #define _RTE_BYTEORDER_X86_H_
   7
   8 #ifdef __cplusplus
   9 extern "C" {
  10 #endif
  11
  12 #include <stdint.h>
  13 #include <rte_common.h>
  14 #include "generic/rte_byteorder.h"
  15
  16 #ifndef RTE_BYTE_ORDER
  17 #define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
  18 #endif
  19
  20 /*
  21  * An architecture-optimized byte swap for a 16-bit value.
  22  *
  23  * Do not use this function directly. The preferred function is rte_bswap16().
  24  */
  25 static inline uint16_t rte_arch_bswap16(uint16_t _x)
  26 {
  27         register uint16_t x = _x;
  28         asm volatile ("xchgb %b[x1],%h[x2]"
  29                       : [x1] "=Q" (x)
  30                       : [x2] "0" (x)
  31                       );
  32         return x;
  33 }
  34
  35 /*
  36  * An architecture-optimized byte swap for a 32-bit value.
  37  *
  38  * Do not use this function directly. The preferred function is rte_bswap32().
  39  */
  40 static inline uint32_t rte_arch_bswap32(uint32_t _x)
  41 {
  42         register uint32_t x = _x;
  43         asm volatile ("bswap %[x]"
  44                       : [x] "+r" (x)
  45                       );
  46         return x;
  47 }
  48
  49 #ifndef RTE_FORCE_INTRINSICS
  50 #define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ?            \
  51                                    rte_constant_bswap16(x) :            \
  52                                    rte_arch_bswap16(x)))
  53
  54 #define rte_bswap32(x) ((uint32_t)(__builtin_constant_p(x) ?            \
  55                                    rte_constant_bswap32(x) :            \
  56                                    rte_arch_bswap32(x)))
  57
  58 #define rte_bswap64(x) ((uint64_t)(__builtin_constant_p(x) ?            \
  59                                    rte_constant_bswap64(x) :            \
  60                                    rte_arch_bswap64(x)))
  61 #else
  62 /*
  63  * __builtin_bswap16 is only available gcc 4.8 and upwards
  64  */
  65 #if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
  66 #define rte_bswap16(x) ((uint16_t)(__builtin_constant_p(x) ?            \
  67                                    rte_constant_bswap16(x) :            \
  68                                    rte_arch_bswap16(x)))
  69 #endif
  70 #endif
  71
  72 #define rte_cpu_to_le_16(x) (x)
  73 #define rte_cpu_to_le_32(x) (x)
  74 #define rte_cpu_to_le_64(x) (x)
  75
  76 #define rte_cpu_to_be_16(x) rte_bswap16(x)
  77 #define rte_cpu_to_be_32(x) rte_bswap32(x)
  78 #define rte_cpu_to_be_64(x) rte_bswap64(x)
  79
  80 #define rte_le_to_cpu_16(x) (x)
  81 #define rte_le_to_cpu_32(x) (x)
  82 #define rte_le_to_cpu_64(x) (x)
  83
  84 #define rte_be_to_cpu_16(x) rte_bswap16(x)
  85 #define rte_be_to_cpu_32(x) rte_bswap32(x)
  86 #define rte_be_to_cpu_64(x) rte_bswap64(x)
  87
  88 #ifdef RTE_ARCH_I686
  89 #include "rte_byteorder_32.h"
  90 #else
  91 #include "rte_byteorder_64.h"
  92 #endif
  93
  94 #ifdef __cplusplus
  95 }
  96 #endif
  97
  98 #endif /* _RTE_BYTEORDER_X86_H_ */