132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/*
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*
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* (C) COPYRIGHT 2014-2015 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU licence.
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*
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* A copy of the licence is included with the program, and can also be obtained
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* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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/**
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* Kernel-wide include for common macros and types.
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*/
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#ifndef _MALISW_H_
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#define _MALISW_H_
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#include <linux/version.h>
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#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0)
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#define U8_MAX ((u8)~0U)
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#define S8_MAX ((s8)(U8_MAX>>1))
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#define S8_MIN ((s8)(-S8_MAX - 1))
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#define U16_MAX ((u16)~0U)
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#define S16_MAX ((s16)(U16_MAX>>1))
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#define S16_MIN ((s16)(-S16_MAX - 1))
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#define U32_MAX ((u32)~0U)
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#define S32_MAX ((s32)(U32_MAX>>1))
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#define S32_MIN ((s32)(-S32_MAX - 1))
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#define U64_MAX ((u64)~0ULL)
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#define S64_MAX ((s64)(U64_MAX>>1))
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#define S64_MIN ((s64)(-S64_MAX - 1))
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#endif /* LINUX_VERSION_CODE */
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#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 5, 0)
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#define SIZE_MAX (~(size_t)0)
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#endif /* LINUX_VERSION_CODE */
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/**
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* MIN - Return the lesser of two values.
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*
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* As a macro it may evaluate its arguments more than once.
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* Refer to MAX macro for more details
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*/
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
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/**
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* MAX - Return the greater of two values.
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*
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* As a macro it may evaluate its arguments more than once.
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* If called on the same two arguments as MIN it is guaranteed to return
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* the one that MIN didn't return. This is significant for types where not
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* all values are comparable e.g. NaNs in floating-point types. But if you want
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* to retrieve the min and max of two values, consider using a conditional swap
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* instead.
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*/
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#define MAX(x, y) ((x) < (y) ? (y) : (x))
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/**
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* @hideinitializer
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* Function-like macro for suppressing unused variable warnings. Where possible
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* such variables should be removed; this macro is present for cases where we
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* much support API backwards compatibility.
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*/
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#define CSTD_UNUSED(x) ((void)(x))
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/**
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* @hideinitializer
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* Function-like macro for use where "no behavior" is desired. This is useful
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* when compile time macros turn a function-like macro in to a no-op, but
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* where having no statement is otherwise invalid.
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*/
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#define CSTD_NOP(...) ((void)#__VA_ARGS__)
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/**
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* Function-like macro for converting a pointer in to a u64 for storing into
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* an external data structure. This is commonly used when pairing a 32-bit
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* CPU with a 64-bit peripheral, such as a Midgard GPU. C's type promotion
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* is complex and a straight cast does not work reliably as pointers are
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* often considered as signed.
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*/
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#define PTR_TO_U64(x) ((uint64_t)((uintptr_t)(x)))
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/**
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* @hideinitializer
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* Function-like macro for stringizing a single level macro.
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* @code
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* #define MY_MACRO 32
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* CSTD_STR1( MY_MACRO )
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* > "MY_MACRO"
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* @endcode
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*/
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#define CSTD_STR1(x) #x
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/**
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* @hideinitializer
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* Function-like macro for stringizing a macro's value. This should not be used
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* if the macro is defined in a way which may have no value; use the
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* alternative @c CSTD_STR2N macro should be used instead.
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* @code
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* #define MY_MACRO 32
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* CSTD_STR2( MY_MACRO )
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* > "32"
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* @endcode
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*/
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#define CSTD_STR2(x) CSTD_STR1(x)
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/**
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* Specify an assertion value which is evaluated at compile time. Recommended
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* usage is specification of a @c static @c INLINE function containing all of
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* the assertions thus:
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*
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* @code
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* static INLINE [module]_compile_time_assertions( void )
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* {
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* COMPILE_TIME_ASSERT( sizeof(uintptr_t) == sizeof(intptr_t) );
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* }
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* @endcode
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*
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* @note Use @c static not @c STATIC. We never want to turn off this @c static
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* specification for testing purposes.
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*/
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#define CSTD_COMPILE_TIME_ASSERT(expr) \
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do { switch (0) { case 0: case (expr):; } } while (false)
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#endif /* _MALISW_H_ */
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