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stdlib: support AARCH32 in endian head file

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Add the support of AARCH32 in endian head file. The code is also
imported from FreeBSD 11.0. It's based on commit in below.

commit 4e3a5b429989b4ff621682ff1462f801237bd551
Author: mmel <mmel@FreeBSD.org>
Date:   Tue Nov 10 12:02:41 2015 +0000

    ARM: Remove trailing whitespace from sys/arm/include
    No functional changes.

    Approved by:    kib (mentor)

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
This commit is contained in:
Haojian Zhuang 2017-06-02 08:51:17 +08:00
parent b15f31ac38
commit e6a993d427
1 changed files with 46 additions and 0 deletions
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46
include/lib/stdlib/machine/endian.h
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@ -29,6 +29,10 @@
* $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $
* $FreeBSD$
*/
/*
* Portions copyright (c) 2017, ARM Limited and Contributors.
* All rights reserved.
*/
#ifndef _MACHINE_ENDIAN_H_
#define _MACHINE_ENDIAN_H_
@ -59,6 +63,45 @@
#define __htonl(x) (__bswap32(x))
#define __htons(x) (__bswap16(x))
#ifdef AARCH32
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_var(__uint32_t v)
{
__uint32_t t1;
__asm __volatile("eor %1, %0, %0, ror #16\n"
"bic %1, %1, #0x00ff0000\n"
"mov %0, %0, ror #8\n"
"eor %0, %0, %1, lsr #8\n"
: "+r" (v), "=r" (t1));
return (v);
}
static __inline __uint16_t
__bswap16_var(__uint16_t v)
{
__uint32_t ret = v & 0xffff;
__asm __volatile(
"mov %0, %0, ror #8\n"
"orr %0, %0, %0, lsr #16\n"
"bic %0, %0, %0, lsl #16"
: "+r" (ret));
return ((__uint16_t)ret);
}
#elif defined AARCH64
static __inline __uint64_t
__bswap64(__uint64_t x)
{
@ -91,6 +134,9 @@ __bswap16_var(__uint16_t v)
return ((__uint16_t)ret);
}
#else
#error "Only AArch32 or AArch64 supported"
#endif /* AARCH32 */
#ifdef __OPTIMIZE__