From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yk0-x22a.google.com (mail-yk0-x22a.google.com [IPv6:2607:f8b0:4002:c07::22a]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id D17BE1A05A6 for ; Wed, 28 May 2014 10:27:52 +1000 (EST) Received: by mail-yk0-f170.google.com with SMTP id 10so7734407ykt.15 for ; Tue, 27 May 2014 17:27:49 -0700 (PDT) From: Cody P Schafer To: LKML , Linux PPC , Cody P Schafer Subject: [PATCH 11/16] byteorder: provide a linux/byteorder.h with {be, le}_to_cpu() and cpu_to_{be, le}() macros Date: Tue, 27 May 2014 17:22:06 -0700 Message-Id: <1401236684-10579-12-git-send-email-dev@codyps.com> In-Reply-To: <1401236684-10579-1-git-send-email-dev@codyps.com> References: <1401236684-10579-1-git-send-email-dev@codyps.com> Cc: Sukadev Bhattiprolu List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Rather manually specifying the size of the integer to be converted, key off of the type size. Reduces duplicate size info and the occurance of certain types of bugs (using the wrong sized conversion). CC: Sukadev Bhattiprolu Signed-off-by: Cody P Schafer --- include/linux/byteorder.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 include/linux/byteorder.h diff --git a/include/linux/byteorder.h b/include/linux/byteorder.h new file mode 100644 index 0000000..c7ab8da --- /dev/null +++ b/include/linux/byteorder.h @@ -0,0 +1,34 @@ +#ifndef LINUX_BYTEORDER_H_ +#define LINUX_BYTEORDER_H_ + +#include + +#define be_to_cpu(v) \ + __builtin_choose_expr(sizeof(v) == sizeof(uint8_t) , v, \ + __builtin_choose_expr(sizeof(v) == sizeof(uint16_t), be16_to_cpu(v), \ + __builtin_choose_expr(sizeof(v) == sizeof(uint32_t), be32_to_cpu(v), \ + __builtin_choose_expr(sizeof(v) == sizeof(uint64_t), be64_to_cpu(v), \ + (void)0)))) + +#define le_to_cpu(v) \ + __builtin_choose_expr(sizeof(v) == sizeof(uint8_t) , v, \ + __builtin_choose_expr(sizeof(v) == sizeof(uint16_t), le16_to_cpu(v), \ + __builtin_choose_expr(sizeof(v) == sizeof(uint32_t), le32_to_cpu(v), \ + __builtin_choose_expr(sizeof(v) == sizeof(uint64_t), le64_to_cpu(v), \ + (void)0)))) + +#define cpu_to_le(v) \ + __builtin_choose_expr(sizeof(v) == sizeof(uint8_t) , v, \ + __builtin_choose_expr(sizeof(v) == sizeof(uint16_t), cpu_to_le16(v), \ + __builtin_choose_expr(sizeof(v) == sizeof(uint32_t), cpu_to_le32(v), \ + __builtin_choose_expr(sizeof(v) == sizeof(uint64_t), cpu_to_le64(v), \ + (void)0)))) + +#define cpu_to_be(v) \ + __builtin_choose_expr(sizeof(v) == sizeof(uint8_t) , v, \ + __builtin_choose_expr(sizeof(v) == sizeof(uint16_t), cpu_to_be16(v), \ + __builtin_choose_expr(sizeof(v) == sizeof(uint32_t), cpu_to_be32(v), \ + __builtin_choose_expr(sizeof(v) == sizeof(uint64_t), cpu_to_be64(v), \ + (void)0)))) + +#endif -- 1.9.3