187 lines
5.1 KiB
C
187 lines
5.1 KiB
C
#ifndef _LINUX_KERNEL_H
|
|
#define _LINUX_KERNEL_H
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/barebox-wrapper.h>
|
|
|
|
#define USHRT_MAX ((u16)(~0U))
|
|
#define SHRT_MAX ((s16)(USHRT_MAX>>1))
|
|
#define SHRT_MIN ((s16)(-SHRT_MAX - 1))
|
|
#define INT_MAX ((int)(~0U>>1))
|
|
#define INT_MIN (-INT_MAX - 1)
|
|
#define UINT_MAX (~0U)
|
|
#define LONG_MAX ((long)(~0UL>>1))
|
|
#define LONG_MIN (-LONG_MAX - 1)
|
|
#define ULONG_MAX (~0UL)
|
|
#define LLONG_MAX ((long long)(~0ULL>>1))
|
|
#define LLONG_MIN (-LLONG_MAX - 1)
|
|
#define ULLONG_MAX (~0ULL)
|
|
|
|
/*
|
|
* This looks more complex than it should be. But we need to
|
|
* get the type for the ~ right in round_down (it needs to be
|
|
* as wide as the result!), and we want to evaluate the macro
|
|
* arguments just once each.
|
|
*
|
|
* NOTE these functions only round to power-of-2 arguments. Use
|
|
* roundup/rounddown for non power-of-2-arguments.
|
|
*/
|
|
#define __round_mask(x, y) ((__typeof__(x))((y)-1))
|
|
#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
|
|
#define round_down(x, y) ((x) & ~__round_mask(x, y))
|
|
|
|
/*
|
|
* min()/max()/clamp() macros that also do
|
|
* strict type-checking.. See the
|
|
* "unnecessary" pointer comparison.
|
|
*/
|
|
#define min(x, y) ({ \
|
|
typeof(x) _min1 = (x); \
|
|
typeof(y) _min2 = (y); \
|
|
(void) (&_min1 == &_min2); \
|
|
_min1 < _min2 ? _min1 : _min2; })
|
|
|
|
#define max(x, y) ({ \
|
|
typeof(x) _max1 = (x); \
|
|
typeof(y) _max2 = (y); \
|
|
(void) (&_max1 == &_max2); \
|
|
_max1 > _max2 ? _max1 : _max2; })
|
|
|
|
#define min3(x, y, z) ({ \
|
|
typeof(x) _min1 = (x); \
|
|
typeof(y) _min2 = (y); \
|
|
typeof(z) _min3 = (z); \
|
|
(void) (&_min1 == &_min2); \
|
|
(void) (&_min1 == &_min3); \
|
|
_min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \
|
|
(_min2 < _min3 ? _min2 : _min3); })
|
|
|
|
#define max3(x, y, z) ({ \
|
|
typeof(x) _max1 = (x); \
|
|
typeof(y) _max2 = (y); \
|
|
typeof(z) _max3 = (z); \
|
|
(void) (&_max1 == &_max2); \
|
|
(void) (&_max1 == &_max3); \
|
|
_max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
|
|
(_max2 > _max3 ? _max2 : _max3); })
|
|
|
|
/**
|
|
* clamp - return a value clamped to a given range with strict typechecking
|
|
* @val: current value
|
|
* @min: minimum allowable value
|
|
* @max: maximum allowable value
|
|
*
|
|
* This macro does strict typechecking of min/max to make sure they are of the
|
|
* same type as val. See the unnecessary pointer comparisons.
|
|
*/
|
|
#define clamp(val, min, max) ({ \
|
|
typeof(val) __val = (val); \
|
|
typeof(min) __min = (min); \
|
|
typeof(max) __max = (max); \
|
|
(void) (&__val == &__min); \
|
|
(void) (&__val == &__max); \
|
|
__val = __val < __min ? __min: __val; \
|
|
__val > __max ? __max: __val; })
|
|
|
|
/*
|
|
* ..and if you can't take the strict
|
|
* types, you can specify one yourself.
|
|
*
|
|
* Or not use min/max/clamp at all, of course.
|
|
*/
|
|
#define min_t(type, x, y) ({ \
|
|
type __min1 = (x); \
|
|
type __min2 = (y); \
|
|
__min1 < __min2 ? __min1: __min2; })
|
|
|
|
#define max_t(type, x, y) ({ \
|
|
type __max1 = (x); \
|
|
type __max2 = (y); \
|
|
__max1 > __max2 ? __max1: __max2; })
|
|
|
|
/**
|
|
* clamp_t - return a value clamped to a given range using a given type
|
|
* @type: the type of variable to use
|
|
* @val: current value
|
|
* @min: minimum allowable value
|
|
* @max: maximum allowable value
|
|
*
|
|
* This macro does no typechecking and uses temporary variables of type
|
|
* 'type' to make all the comparisons.
|
|
*/
|
|
#define clamp_t(type, val, min, max) ({ \
|
|
type __val = (val); \
|
|
type __min = (min); \
|
|
type __max = (max); \
|
|
__val = __val < __min ? __min: __val; \
|
|
__val > __max ? __max: __val; })
|
|
|
|
/**
|
|
* clamp_val - return a value clamped to a given range using val's type
|
|
* @val: current value
|
|
* @min: minimum allowable value
|
|
* @max: maximum allowable value
|
|
*
|
|
* This macro does no typechecking and uses temporary variables of whatever
|
|
* type the input argument 'val' is. This is useful when val is an unsigned
|
|
* type and min and max are literals that will otherwise be assigned a signed
|
|
* integer type.
|
|
*/
|
|
#define clamp_val(val, min, max) ({ \
|
|
typeof(val) __val = (val); \
|
|
typeof(val) __min = (min); \
|
|
typeof(val) __max = (max); \
|
|
__val = __val < __min ? __min: __val; \
|
|
__val > __max ? __max: __val; })
|
|
|
|
|
|
/* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
|
|
#define roundup(x, y) ( \
|
|
{ \
|
|
const typeof(y) __y = y; \
|
|
(((x) + (__y - 1)) / __y) * __y; \
|
|
} \
|
|
)
|
|
#define rounddown(x, y) ( \
|
|
{ \
|
|
typeof(x) __x = (x); \
|
|
__x - (__x % (y)); \
|
|
} \
|
|
)
|
|
|
|
/*
|
|
* Multiplies an integer by a fraction, while avoiding unnecessary
|
|
* overflow or loss of precision.
|
|
*/
|
|
#define mult_frac(x, numer, denom)( \
|
|
{ \
|
|
typeof(x) quot = (x) / (denom); \
|
|
typeof(x) rem = (x) % (denom); \
|
|
(quot * (numer)) + ((rem * (numer)) / (denom)); \
|
|
} \
|
|
)
|
|
|
|
extern const char hex_asc[];
|
|
#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
|
|
#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
|
|
|
|
static inline char *hex_byte_pack(char *buf, u8 byte)
|
|
{
|
|
*buf++ = hex_asc_hi(byte);
|
|
*buf++ = hex_asc_lo(byte);
|
|
return buf;
|
|
}
|
|
|
|
extern const char hex_asc_upper[];
|
|
#define hex_asc_upper_lo(x) hex_asc_upper[((x) & 0x0f)]
|
|
#define hex_asc_upper_hi(x) hex_asc_upper[((x) & 0xf0) >> 4]
|
|
|
|
static inline char *hex_byte_pack_upper(char *buf, u8 byte)
|
|
{
|
|
*buf++ = hex_asc_upper_hi(byte);
|
|
*buf++ = hex_asc_upper_lo(byte);
|
|
return buf;
|
|
}
|
|
|
|
#endif /* _LINUX_KERNEL_H */
|