mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-28 21:45:01 +08:00
1ff8f739c7
fix the following 'make headers_check' warnings:
usr/include/asm-xtensa/swab.h:14: include of <linux/types.h> is preferred over <asm/types.h>
usr/include/asm-xtensa/swab.h:19: found __[us]{8,16,32,64} type without #include <linux/types.h>
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
/*
|
|
* include/asm-xtensa/swab.h
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2001 - 2005 Tensilica Inc.
|
|
*/
|
|
|
|
#ifndef _XTENSA_SWAB_H
|
|
#define _XTENSA_SWAB_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/compiler.h>
|
|
|
|
#define __SWAB_64_THRU_32__
|
|
|
|
static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
|
|
{
|
|
__u32 res;
|
|
/* instruction sequence from Xtensa ISA release 2/2000 */
|
|
__asm__("ssai 8 \n\t"
|
|
"srli %0, %1, 16 \n\t"
|
|
"src %0, %0, %1 \n\t"
|
|
"src %0, %0, %0 \n\t"
|
|
"src %0, %1, %0 \n"
|
|
: "=&a" (res)
|
|
: "a" (x)
|
|
);
|
|
return res;
|
|
}
|
|
#define __arch_swab32 __arch_swab32
|
|
|
|
static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
|
|
{
|
|
/* Given that 'short' values are signed (i.e., can be negative),
|
|
* we cannot assume that the upper 16-bits of the register are
|
|
* zero. We are careful to mask values after shifting.
|
|
*/
|
|
|
|
/* There exists an anomaly between xt-gcc and xt-xcc. xt-gcc
|
|
* inserts an extui instruction after putting this function inline
|
|
* to ensure that it uses only the least-significant 16 bits of
|
|
* the result. xt-xcc doesn't use an extui, but assumes the
|
|
* __asm__ macro follows convention that the upper 16 bits of an
|
|
* 'unsigned short' result are still zero. This macro doesn't
|
|
* follow convention; indeed, it leaves garbage in the upport 16
|
|
* bits of the register.
|
|
|
|
* Declaring the temporary variables 'res' and 'tmp' to be 32-bit
|
|
* types while the return type of the function is a 16-bit type
|
|
* forces both compilers to insert exactly one extui instruction
|
|
* (or equivalent) to mask off the upper 16 bits. */
|
|
|
|
__u32 res;
|
|
__u32 tmp;
|
|
|
|
__asm__("extui %1, %2, 8, 8\n\t"
|
|
"slli %0, %2, 8 \n\t"
|
|
"or %0, %0, %1 \n"
|
|
: "=&a" (res), "=&a" (tmp)
|
|
: "a" (x)
|
|
);
|
|
|
|
return res;
|
|
}
|
|
#define __arch_swab16 __arch_swab16
|
|
|
|
#endif /* _XTENSA_SWAB_H */
|