262 lines
7.4 KiB
C
262 lines
7.4 KiB
C
#ifndef _LINUX_KERNEL_H
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#define _LINUX_KERNEL_H
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#include <linux/compiler.h>
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#include <linux/bug.h>
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#include <linux/barebox-wrapper.h>
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#define USHRT_MAX ((u16)(~0U))
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#define SHRT_MAX ((s16)(USHRT_MAX>>1))
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#define SHRT_MIN ((s16)(-SHRT_MAX - 1))
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#define INT_MAX ((int)(~0U>>1))
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#define INT_MIN (-INT_MAX - 1)
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#define UINT_MAX (~0U)
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#define LONG_MAX ((long)(~0UL>>1))
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#define LONG_MIN (-LONG_MAX - 1)
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#define ULONG_MAX (~0UL)
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#define LLONG_MAX ((long long)(~0ULL>>1))
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#define LLONG_MIN (-LLONG_MAX - 1)
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#define ULLONG_MAX (~0ULL)
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#define SIZE_MAX (~(size_t)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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#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a) - 1)
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#define __ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask))
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#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
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#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
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/*
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* This looks more complex than it should be. But we need to
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* get the type for the ~ right in round_down (it needs to be
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* as wide as the result!), and we want to evaluate the macro
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* arguments just once each.
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*
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* NOTE these functions only round to power-of-2 arguments. Use
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* roundup/rounddown for non power-of-2-arguments.
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*/
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#define __round_mask(x, y) ((__typeof__(x))((y)-1))
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#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
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#define round_down(x, y) ((x) & ~__round_mask(x, y))
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#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
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#define DIV_ROUND_CLOSEST(x, divisor)( \
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{ \
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typeof(divisor) __divisor = divisor; \
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(((x) + ((__divisor) / 2)) / (__divisor)); \
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} \
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)
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/**
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* upper_32_bits - return bits 32-63 of a number
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* @n: the number we're accessing
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*
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* A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
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* the "right shift count >= width of type" warning when that quantity is
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* 32-bits.
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*/
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#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
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/**
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* lower_32_bits - return bits 0-31 of a number
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* @n: the number we're accessing
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*/
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#define lower_32_bits(n) ((u32)(n))
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#define abs(x) ({ \
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long __x = (x); \
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(__x < 0) ? -__x : __x; \
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})
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#define abs64(x) ({ \
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s64 __x = (x); \
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(__x < 0) ? -__x : __x; \
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})
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void __noreturn panic(const char *fmt, ...);
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extern unsigned long simple_strtoul(const char *,char **,unsigned int);
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extern long simple_strtol(const char *,char **,unsigned int);
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extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
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/*
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* min()/max()/clamp() macros that also do
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* strict type-checking.. See the
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* "unnecessary" pointer comparison.
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*/
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#define min(x, y) ({ \
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typeof(x) _min1 = (x); \
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typeof(y) _min2 = (y); \
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(void) (&_min1 == &_min2); \
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_min1 < _min2 ? _min1 : _min2; })
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#define max(x, y) ({ \
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typeof(x) _max1 = (x); \
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typeof(y) _max2 = (y); \
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(void) (&_max1 == &_max2); \
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_max1 > _max2 ? _max1 : _max2; })
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#define min3(x, y, z) ({ \
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typeof(x) _min1 = (x); \
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typeof(y) _min2 = (y); \
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typeof(z) _min3 = (z); \
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(void) (&_min1 == &_min2); \
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(void) (&_min1 == &_min3); \
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_min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \
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(_min2 < _min3 ? _min2 : _min3); })
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#define max3(x, y, z) ({ \
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typeof(x) _max1 = (x); \
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typeof(y) _max2 = (y); \
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typeof(z) _max3 = (z); \
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(void) (&_max1 == &_max2); \
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(void) (&_max1 == &_max3); \
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_max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
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(_max2 > _max3 ? _max2 : _max3); })
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/**
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* clamp - return a value clamped to a given range with strict typechecking
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* @val: current value
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* @min: minimum allowable value
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* @max: maximum allowable value
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*
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* This macro does strict typechecking of min/max to make sure they are of the
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* same type as val. See the unnecessary pointer comparisons.
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*/
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#define clamp(val, min, max) ({ \
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typeof(val) __val = (val); \
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typeof(min) __min = (min); \
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typeof(max) __max = (max); \
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(void) (&__val == &__min); \
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(void) (&__val == &__max); \
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__val = __val < __min ? __min: __val; \
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__val > __max ? __max: __val; })
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/*
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* ..and if you can't take the strict
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* types, you can specify one yourself.
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*
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* Or not use min/max/clamp at all, of course.
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*/
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#define min_t(type, x, y) ({ \
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type __min1 = (x); \
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type __min2 = (y); \
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__min1 < __min2 ? __min1: __min2; })
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#define max_t(type, x, y) ({ \
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type __max1 = (x); \
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type __max2 = (y); \
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__max1 > __max2 ? __max1: __max2; })
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/**
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* clamp_t - return a value clamped to a given range using a given type
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* @type: the type of variable to use
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* @val: current value
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* @min: minimum allowable value
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* @max: maximum allowable value
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*
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* This macro does no typechecking and uses temporary variables of type
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* 'type' to make all the comparisons.
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*/
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#define clamp_t(type, val, min, max) ({ \
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type __val = (val); \
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type __min = (min); \
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type __max = (max); \
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__val = __val < __min ? __min: __val; \
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__val > __max ? __max: __val; })
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/**
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* clamp_val - return a value clamped to a given range using val's type
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* @val: current value
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* @min: minimum allowable value
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* @max: maximum allowable value
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*
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* This macro does no typechecking and uses temporary variables of whatever
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* type the input argument 'val' is. This is useful when val is an unsigned
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* type and min and max are literals that will otherwise be assigned a signed
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* integer type.
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*/
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#define clamp_val(val, min, max) ({ \
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typeof(val) __val = (val); \
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typeof(val) __min = (min); \
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typeof(val) __max = (max); \
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__val = __val < __min ? __min: __val; \
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__val > __max ? __max: __val; })
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/* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
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#define roundup(x, y) ( \
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{ \
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const typeof(y) __y = y; \
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(((x) + (__y - 1)) / __y) * __y; \
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} \
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)
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#define rounddown(x, y) ( \
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{ \
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typeof(x) __x = (x); \
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__x - (__x % (y)); \
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} \
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)
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/*
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* Multiplies an integer by a fraction, while avoiding unnecessary
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* overflow or loss of precision.
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*/
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#define mult_frac(x, numer, denom)( \
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{ \
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typeof(x) quot = (x) / (denom); \
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typeof(x) rem = (x) % (denom); \
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(quot * (numer)) + ((rem * (numer)) / (denom)); \
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} \
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)
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extern const char hex_asc[];
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#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
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#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
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static inline char *hex_byte_pack(char *buf, u8 byte)
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{
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*buf++ = hex_asc_hi(byte);
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*buf++ = hex_asc_lo(byte);
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return buf;
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}
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extern const char hex_asc_upper[];
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#define hex_asc_upper_lo(x) hex_asc_upper[((x) & 0x0f)]
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#define hex_asc_upper_hi(x) hex_asc_upper[((x) & 0xf0) >> 4]
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static inline char *hex_byte_pack_upper(char *buf, u8 byte)
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{
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*buf++ = hex_asc_upper_hi(byte);
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*buf++ = hex_asc_upper_lo(byte);
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return buf;
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}
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/**
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* container_of - cast a member of a structure out to the containing structure
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* @ptr: the pointer to the member.
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* @type: the type of the container struct this is embedded in.
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* @member: the name of the member within the struct.
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*
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*/
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#define container_of(ptr, type, member) ({ \
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const typeof( ((type *)0)->member ) *__mptr = (ptr); \
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(type *)( (char *)__mptr - offsetof(type,member) );})
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#endif /* _LINUX_KERNEL_H */
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