mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-24 21:54:01 +00:00
b5f045e12f
The find_closest() macro can be used to find an element in a sorted array that is closest to an input value. Bring in this macro from Linux v6.3-rc1-2-g8ca09d5fa354. Signed-off-by: Chris Packham <judge.packham@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
311 lines
8.6 KiB
C
311 lines
8.6 KiB
C
#ifndef _LINUX_KERNEL_H
|
|
#define _LINUX_KERNEL_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/printk.h> /* for printf/pr_* utilities */
|
|
|
|
#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)
|
|
#ifndef SIZE_MAX
|
|
#define SIZE_MAX (~(size_t)0)
|
|
#endif
|
|
#ifndef SSIZE_MAX
|
|
#define SSIZE_MAX ((ssize_t)(SIZE_MAX >> 1))
|
|
#endif
|
|
|
|
#define U8_MAX ((u8)~0U)
|
|
#define S8_MAX ((s8)(U8_MAX>>1))
|
|
#define S8_MIN ((s8)(-S8_MAX - 1))
|
|
#define U16_MAX ((u16)~0U)
|
|
#define S16_MAX ((s16)(U16_MAX>>1))
|
|
#define S16_MIN ((s16)(-S16_MAX - 1))
|
|
#define U32_MAX ((u32)~0U)
|
|
#define S32_MAX ((s32)(U32_MAX>>1))
|
|
#define S32_MIN ((s32)(-S32_MAX - 1))
|
|
#define U64_MAX ((u64)~0ULL)
|
|
#define S64_MAX ((s64)(U64_MAX>>1))
|
|
#define S64_MIN ((s64)(-S64_MAX - 1))
|
|
|
|
/* Aliases defined by stdint.h */
|
|
#define UINT32_MAX U32_MAX
|
|
#define UINT64_MAX U64_MAX
|
|
|
|
#define INT32_MAX S32_MAX
|
|
|
|
#define STACK_MAGIC 0xdeadbeef
|
|
|
|
#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
|
|
|
|
#define ALIGN(x,a) __ALIGN_MASK((x),(typeof(x))(a)-1)
|
|
#define ALIGN_DOWN(x, a) ALIGN((x) - ((a) - 1), (a))
|
|
#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
|
|
#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
|
|
#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
|
|
|
|
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
#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))
|
|
|
|
#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
|
|
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
|
|
|
|
#define DIV_ROUND_DOWN_ULL(ll, d) \
|
|
({ unsigned long long _tmp = (ll); do_div(_tmp, d); _tmp; })
|
|
|
|
#define DIV_ROUND_UP_ULL(ll, d) DIV_ROUND_DOWN_ULL((ll) + (d) - 1, (d))
|
|
|
|
#define ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1))
|
|
|
|
#if BITS_PER_LONG == 32
|
|
# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
|
|
#else
|
|
# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
|
|
#endif
|
|
|
|
/* 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)); \
|
|
} \
|
|
)
|
|
|
|
/*
|
|
* Divide positive or negative dividend by positive divisor and round
|
|
* to closest integer. Result is undefined for negative divisors and
|
|
* for negative dividends if the divisor variable type is unsigned.
|
|
*/
|
|
#define DIV_ROUND_CLOSEST(x, divisor)( \
|
|
{ \
|
|
typeof(x) __x = x; \
|
|
typeof(divisor) __d = divisor; \
|
|
(((typeof(x))-1) > 0 || \
|
|
((typeof(divisor))-1) > 0 || (__x) > 0) ? \
|
|
(((__x) + ((__d) / 2)) / (__d)) : \
|
|
(((__x) - ((__d) / 2)) / (__d)); \
|
|
} \
|
|
)
|
|
/*
|
|
* Same as above but for u64 dividends. divisor must be a 32-bit
|
|
* number.
|
|
*/
|
|
#define DIV_ROUND_CLOSEST_ULL(x, divisor)( \
|
|
{ \
|
|
typeof(divisor) __d = divisor; \
|
|
unsigned long long _tmp = (x) + (__d) / 2; \
|
|
do_div(_tmp, __d); \
|
|
_tmp; \
|
|
} \
|
|
)
|
|
|
|
/*
|
|
* 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)); \
|
|
} \
|
|
)
|
|
|
|
/**
|
|
* upper_32_bits - return bits 32-63 of a number
|
|
* @n: the number we're accessing
|
|
*
|
|
* A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
|
|
* the "right shift count >= width of type" warning when that quantity is
|
|
* 32-bits.
|
|
*/
|
|
#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
|
|
|
|
/**
|
|
* lower_32_bits - return bits 0-31 of a number
|
|
* @n: the number we're accessing
|
|
*/
|
|
#define lower_32_bits(n) ((u32)(n))
|
|
|
|
/*
|
|
* abs() handles unsigned and signed longs, ints, shorts and chars. For all
|
|
* input types abs() returns a signed long.
|
|
* abs() should not be used for 64-bit types (s64, u64, long long) - use abs64()
|
|
* for those.
|
|
*/
|
|
#define abs(x) ({ \
|
|
long ret; \
|
|
if (sizeof(x) == sizeof(long)) { \
|
|
long __x = (x); \
|
|
ret = (__x < 0) ? -__x : __x; \
|
|
} else { \
|
|
int __x = (x); \
|
|
ret = (__x < 0) ? -__x : __x; \
|
|
} \
|
|
ret; \
|
|
})
|
|
|
|
#define abs64(x) ({ \
|
|
s64 __x = (x); \
|
|
(__x < 0) ? -__x : __x; \
|
|
})
|
|
|
|
/*
|
|
* 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) min((typeof(x))min(x, y), z)
|
|
#define max3(x, y, z) max((typeof(x))max(x, y), z)
|
|
|
|
/**
|
|
* min_not_zero - return the minimum that is _not_ zero, unless both are zero
|
|
* @x: value1
|
|
* @y: value2
|
|
*/
|
|
#define min_not_zero(x, y) ({ \
|
|
typeof(x) __x = (x); \
|
|
typeof(y) __y = (y); \
|
|
__x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
|
|
|
|
/**
|
|
* clamp - return a value clamped to a given range with strict typechecking
|
|
* @val: current value
|
|
* @lo: lowest allowable value
|
|
* @hi: highest allowable value
|
|
*
|
|
* This macro does strict typechecking of lo/hi to make sure they are of the
|
|
* same type as val. See the unnecessary pointer comparisons.
|
|
*/
|
|
#define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi)
|
|
|
|
/*
|
|
* ..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
|
|
* @lo: minimum allowable value
|
|
* @hi: 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, lo, hi) min_t(type, max_t(type, val, lo), hi)
|
|
|
|
/**
|
|
* clamp_val - return a value clamped to a given range using val's type
|
|
* @val: current value
|
|
* @lo: minimum allowable value
|
|
* @hi: 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, lo, hi) clamp_t(typeof(val), val, lo, hi)
|
|
|
|
|
|
/*
|
|
* swap - swap value of @a and @b
|
|
*/
|
|
#define swap(a, b) \
|
|
do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
|
|
|
|
/**
|
|
* container_of - cast a member of a structure out to the containing structure
|
|
* @ptr: the pointer to the member.
|
|
* @type: the type of the container struct this is embedded in.
|
|
* @member: the name of the member within the struct.
|
|
*
|
|
*/
|
|
#define container_of(ptr, type, member) ({ \
|
|
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
|
|
(type *)( (char *)__mptr - offsetof(type,member) );})
|
|
|
|
/*
|
|
* check_member() - Check the offset of a structure member
|
|
*
|
|
* @structure: Name of structure (e.g. global_data)
|
|
* @member: Name of member (e.g. baudrate)
|
|
* @offset: Expected offset in bytes
|
|
*/
|
|
#define check_member(structure, member, offset) _Static_assert( \
|
|
offsetof(struct structure, member) == (offset), \
|
|
"`struct " #structure "` offset for `" #member "` is not " #offset)
|
|
|
|
#define __find_closest(x, a, as, op) \
|
|
({ \
|
|
typeof(as) __fc_i, __fc_as = (as) - 1; \
|
|
typeof(x) __fc_x = (x); \
|
|
typeof(*a) const *__fc_a = (a); \
|
|
for (__fc_i = 0; __fc_i < __fc_as; __fc_i++) { \
|
|
if (__fc_x op DIV_ROUND_CLOSEST(__fc_a[__fc_i] + \
|
|
__fc_a[__fc_i + 1], 2)) \
|
|
break; \
|
|
} \
|
|
(__fc_i); \
|
|
})
|
|
|
|
/**
|
|
* find_closest - locate the closest element in a sorted array
|
|
* @x: The reference value.
|
|
* @a: The array in which to look for the closest element. Must be sorted
|
|
* in ascending order.
|
|
* @as: Size of 'a'.
|
|
*
|
|
* Returns the index of the element closest to 'x'.
|
|
*/
|
|
#define find_closest(x, a, as) __find_closest(x, a, as, <=)
|
|
|
|
#endif
|