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Add some endianess-related functions and macros.

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This commit is contained in:
Olivier Houchard 2004-05-04 22:24:56 +00:00
parent 6e695cec6c
commit 2cbc052a4c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=128938
1 changed files with 60 additions and 1 deletions
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61
sys/arm/include/endian.h
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@ -33,6 +33,65 @@
#ifndef _ENDIAN_H_
#define _ENDIAN_H_
#define BYTE_ORDER _LITTLE_ENDIAN
#include <sys/_types.h>
/*
* Definitions for byte order, according to byte significance from low
* address to high.
*/
#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
#define _BYTE_ORDER _LITTLE_ENDIAN
#if __BSD_VISIBLE
#define LITTLE_ENDIAN _LITTLE_ENDIAN
#define BIG_ENDIAN _BIG_ENDIAN
#define PDP_ENDIAN _PDP_ENDIAN
#define BYTE_ORDER _BYTE_ORDER
#endif
#define _QUAD_HIGHWORD 1
#define _QUAD_LOWWORD 0
#define __ntohl(x) (__bswap32(x))
#define __ntohs(x) (__bswap16(x))
#define __htonl(x) (__bswap16(x))
#define __htons(x) (__bswap32(x))
static __inline __uint64_t
__bswap64(__uint64_t _x)
{
return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
((_x << 24) & ((__uint64_t)0xff << 40)) |
((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
}
static __inline __uint32_t
__bswap32(__uint32_t v)
{
__uint32_t t1;
t1 = v ^ ((v << 16) | (v >> 16));
t1 &= 0xff00ffffU;
v = (v >> 8) | (v << 24);
v ^= (t1 >> 8);
return (v);
}
static __inline __uint16_t
__bswap16(__uint32_t v)
{
__asm __volatile(
"mov %0, %1, ror #8\n"
"orr %0, %0, %0, lsr #16\n"
"bic %0, %0, %0, lsl #16"
: "=r" (v)
: "0" (v));
return (v);
}
#endif /* !_ENDIAN_H_ */