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