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buildsystem: Determine the endianness only in the buildsystem

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Let the buildsystem (make / meson) handle the endianness determination
and set the __FLASHROM_LITTLE_ENDIAN__ or __FLASHROM_BIG_ENDIAN__ macro
as cflag.

Change-Id: I37093528ae55e712cc30a0267a8ceac332750e7d
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.de>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/58273
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
This commit is contained in:
Thomas Heijligen 2021-10-12 16:47:43 +02:00 committed by Nico Huber
parent ba1c5eb125
commit b583647888
3 changed files with 14 additions and 89 deletions
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7
Makefile
View File

@ -248,6 +248,13 @@ ifneq ($(ARCH)-little, $(filter $(ARCH),x86 mips)-$(ENDIAN))
$(call mark_unsupported,CONFIG_INTERNAL)
endif
ifeq ($(ENDIAN), little)
FEATURE_CFLAGS += -D'__FLASHROM_LITTLE_ENDIAN__=1'
endif
ifeq ($(ENDIAN), big)
FEATURE_CFLAGS += -D'__FLASHROM_BIG_ENDIAN__=1'
endif
# PCI port I/O support is unimplemented on PPC/MIPS/SPARC and unavailable on ARM.
# Right now this means the drivers below only work on x86.
ifneq ($(ARCH), x86)

7
meson.build
View File

@ -29,6 +29,13 @@ add_project_arguments('-D_POSIX_C_SOURCE=200809L', language : 'c') # required fo
add_project_arguments('-D_BSD_SOURCE', language : 'c') # required for glibc < v2.19
add_project_arguments('-DFLASHROM_VERSION="' + meson.project_version() + '"', language : 'c')
if host_machine.endian() == 'little'
add_project_arguments('-D__FLASHROM_LITTLE_ENDIAN__=1', language : 'c')
endif
if host_machine.endian() == 'big'
add_project_arguments('-D__FLASHROM_BIG_ENDIAN__=1', language : 'c')
endif
# get defaults from configure
config_atahpt = get_option('config_atahpt')
config_atapromise = get_option('config_atapromise')

89
platform.h
View File

@ -71,93 +71,4 @@
#error Unknown architecture
#endif
/* The next big hunk tries to guess endianness from various preprocessor macros */
/* First some error checking in case some weird header has defined both.
* NB: OpenBSD always defines _BIG_ENDIAN and _LITTLE_ENDIAN. */
#if defined (__LITTLE_ENDIAN__) && defined (__BIG_ENDIAN__)
#error Conflicting endianness #define
#endif
#if IS_X86
/* All x86 is little-endian. */
#define __FLASHROM_LITTLE_ENDIAN__ 1
#elif IS_MIPS
/* MIPS can be either endian. */
#if defined (__MIPSEL) || defined (__MIPSEL__) || defined (_MIPSEL) || defined (MIPSEL)
#define __FLASHROM_LITTLE_ENDIAN__ 1
#elif defined (__MIPSEB) || defined (__MIPSEB__) || defined (_MIPSEB) || defined (MIPSEB)
#define __FLASHROM_BIG_ENDIAN__ 1
#endif
#elif IS_PPC
/* PowerPC can be either endian. */
#if defined (_BIG_ENDIAN) || defined (__BIG_ENDIAN__)
#define __FLASHROM_BIG_ENDIAN__ 1
#elif defined (_LITTLE_ENDIAN) || defined (__LITTLE_ENDIAN__)
#define __FLASHROM_LITTLE_ENDIAN__ 1
#endif
#elif IS_ARM
/* ARM can be either endian. */
#if defined (__ARMEB__) || defined (__BIG_ENDIAN__)
#define __FLASHROM_BIG_ENDIAN__ 1
#elif defined (__ARMEL__) || defined (__LITTLE_ENDIAN__)
#define __FLASHROM_LITTLE_ENDIAN__ 1
#endif
#elif IS_SPARC
/* SPARC is big endian in general (but allows to access data in little endian too). */
#define __FLASHROM_BIG_ENDIAN__ 1
#elif IS_ARC
#if defined(__BIG_ENDIAN__)
#define __FLASHROM_BIG_ENDIAN__ 1
#else
#define __FLASHROM_LITTLE_ENDIAN__ 1
#endif
#endif /* IS_? */
#if !defined (__FLASHROM_BIG_ENDIAN__) && !defined (__FLASHROM_LITTLE_ENDIAN__)
/* If architecture-specific approaches fail try generic variants. First: BSD (works about everywhere). */
#if !IS_WINDOWS
#include <sys/param.h>
#if defined (__BYTE_ORDER)
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define __FLASHROM_LITTLE_ENDIAN__
#elif __BYTE_ORDER == __BIG_ENDIAN
#define __FLASHROM_BIG_ENDIAN__
#else
#error Unknown byte order!
#endif
#endif /* defined __BYTE_ORDER */
#endif /* !IS_WINDOWS */
#if !defined (__FLASHROM_BIG_ENDIAN__) && !defined (__FLASHROM_LITTLE_ENDIAN__)
/* Nonstandard libc-specific macros for determining endianness. */
/* musl provides an endian.h as well... but it can not be detected from within C. */
#if defined(__GLIBC__)
#include <endian.h>
#if BYTE_ORDER == LITTLE_ENDIAN
#define __FLASHROM_LITTLE_ENDIAN__ 1
#elif BYTE_ORDER == BIG_ENDIAN
#define __FLASHROM_BIG_ENDIAN__ 1
#endif
#endif
#endif
#endif
#if !defined (__FLASHROM_BIG_ENDIAN__) && !defined (__FLASHROM_LITTLE_ENDIAN__)
#error Unable to determine endianness.
#endif
#endif /* !__PLATFORM_H__ */