271 lines
6.3 KiB
C
271 lines
6.3 KiB
C
/*
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* =====================================================================================
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*
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* Filename: support.h
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*
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* Description: misc utilities definition.
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*
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* Version: 2.0
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* Create: 2017-11-03 11:34:34
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* Revision: none
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* Compiler: gcc version 6.3.0 (crosstool-NG crosstool-ng-1.23.0)
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*
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* Author: caozilong@allwinnertech.com
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* Organization: BU1-PSW
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* Last Modified: 2020-03-25 12:20:13
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*
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* =====================================================================================
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*/
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#ifndef __SUPPORT_H__
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#define __SUPPORT_H__
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#include <typedef.h>
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#include <kapi.h>
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/*
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* Generic macro to convert pointers to values for comparison purposes.
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*/
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#ifndef p2n
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#define p2n(p) ((ptrdiff_t)((ptrdiff_t*)(p)))
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#endif
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/*
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* min()/max() 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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#ifndef min
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#define min(x,y) ({ \
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typeof(x) _x = (x); \
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typeof(y) _y = (y); \
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(void) (&_x == &_y); \
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_x < _y ? _x : _y; })
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#endif
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#ifndef max
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#define max(x,y) ({ \
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typeof(x) _x = (x); \
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typeof(y) _y = (y); \
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(void) (&_x == &_y); \
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_x > _y ? _x : _y; })
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#endif
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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 at all, of course.
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*/
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#define min_t(type,x,y) \
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({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
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#define max_t(type,x,y) \
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({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
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//#define BITS_PER_LONG 32
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//#define BITS_PER_LONG_LONG 64
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#ifndef ALIGN
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#define ALIGN(val,align) (((val) + ((align) - 1)) & ~((align) - 1))
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#endif
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#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
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#ifndef INT_MAX
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#define INT_MAX ((int)(~0U>>1))
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#endif
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#ifndef INT_MIN
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#define INT_MIN (-INT_MAX - 1)
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#endif
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#ifndef UINT_MAX
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#define UINT_MAX (~0U)
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#endif
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#ifndef LONG_MAX
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#define LONG_MAX ((long)(~0UL>>1))
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#endif
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#ifndef LONG_MIN
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#define LONG_MIN (-LONG_MAX - 1)
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#endif
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#ifndef ULONG_MAX
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#define ULONG_MAX (~0UL)
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#endif
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#ifndef LLONG_MAX
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#define LLONG_MAX ((long long)(~0ULL>>1))
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#endif
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#ifndef LLONG_MIN
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#define LLONG_MIN (-LLONG_MAX - 1)
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#endif
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#ifndef ULLONG_MAX
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#define ULLONG_MAX (~0ULL)
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#endif
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#ifndef DATA_TYPE_X_BOOL
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#define DATA_TYPE_X_BOOL
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typedef enum
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{
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#ifndef FALSE
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FALSE = 0,
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#endif
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#ifndef NO
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NO = 0,
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#endif
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#ifndef ZERO
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ZERO = 0,
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#endif
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#ifndef TRUE
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TRUE = 1,
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#endif
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#ifndef YES
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YES = 1,
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#endif
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#ifndef ONE
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ONE = 1,
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#endif
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#ifndef OK
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OK = 0,
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#endif
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#ifndef FAIL
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FAIL = -1,
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#endif
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} BOOL;
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#endif
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/*
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* Check at compile time that something is of a particular type.
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* Always evaluates to 1 so you may use it easily in comparisons.
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*/
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#define typecheck(type,x) \
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({ type __dummy; \
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typeof(x) __dummy2; \
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(void)(&__dummy == &__dummy2); \
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1; \
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})
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static inline int is_power_of_2(unsigned long n)
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{
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return (n != 0 && ((n & (n - 1)) == 0));
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}
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/* round "x" up/down to next multiple of "align" (which must be a power of 2) */
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#define ROUND_UP(x, align) \
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(((unsigned long)(x) + ((unsigned long)(align) - 1)) & \
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~((unsigned long)(align) - 1))
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#define ROUND_DOWN(x, align) \
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((unsigned long)(x) & ~((unsigned long)(align) - 1))
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//#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
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/**
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* test_bit - Determine whether a bit is set
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* @nr: bit number to test
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* @addr: Address to start counting from
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*/
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static inline int test_bit(int nr, long *addr)
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{
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int mask;
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addr += nr >> 5;
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mask = 1 << (nr & 0x1f);
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return ((mask & *addr) != 0);
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}
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/*
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* These functions are the basis of our bit ops.
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*
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* First, the atomic bitops. These use native endian.
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*/
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static inline void set_bit(unsigned int bit, volatile unsigned long *p)
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{
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unsigned long flags;
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unsigned long mask = 1UL << (bit & 31);
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p += bit >> 5;
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ENTER_CRITICAL(flags);
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*p |= mask;
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EXIT_CRITICAL(flags);
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}
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static inline void clear_bit(unsigned int bit, volatile unsigned long *p)
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{
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unsigned long flags;
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unsigned long mask = 1UL << (bit & 31);
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p += bit >> 5;
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ENTER_CRITICAL(flags);
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*p &= ~mask;
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EXIT_CRITICAL(flags);
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}
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static inline void change_bit(unsigned int bit, volatile unsigned long *p)
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{
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unsigned long flags;
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unsigned long mask = 1UL << (bit & 31);
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p += bit >> 5;
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ENTER_CRITICAL(flags);
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*p ^= mask;
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EXIT_CRITICAL(flags);
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}
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static inline int test_and_set_bit(unsigned int bit, volatile unsigned long *p)
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{
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unsigned long flags;
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unsigned int res;
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unsigned long mask = 1UL << (bit & 31);
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p += bit >> 5;
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ENTER_CRITICAL(flags);
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res = *p;
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*p = res | mask;
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EXIT_CRITICAL(flags);
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return res & mask;
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}
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static inline int test_and_clear_bit(unsigned int bit, volatile unsigned long *p)
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{
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unsigned long flags;
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unsigned int res;
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unsigned long mask = 1UL << (bit & 31);
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p += bit >> 5;
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ENTER_CRITICAL(flags);
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res = *p;
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*p = res & ~mask;
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EXIT_CRITICAL(flags);
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return res & mask;
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}
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static inline int test_and_change_bit(unsigned int bit, volatile unsigned long *p)
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{
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unsigned long flags;
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unsigned int res;
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unsigned long mask = 1UL << (bit & 31);
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p += bit >> 5;
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ENTER_CRITICAL(flags);
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res = *p;
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*p = res ^ mask;
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EXIT_CRITICAL(flags);
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return res & mask;
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}
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/* -------------------------------- jiffies -----------------------------*/
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#define HZ 100
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#define jiffies ((unsigned long)rt_tick_get())
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/*
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* These inlines deal with timer wrapping correctly. You are
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* strongly encouraged to use them
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* 1. Because people otherwise forget
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* 2. Because if the timer wrap changes in future you won't have to
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* alter your driver code.
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*
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* time_after(a,b) returns true if the time a is after time b.
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*
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* Do this with "<0" and ">=0" to only test the sign of the result. A
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* good compiler would generate better code (and a really good compiler
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* wouldn't care). Gcc is currently neither.
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*/
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#define time_after(a,b) \
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(typecheck(unsigned long, a) && \
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typecheck(unsigned long, b) && \
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((int)(b) - (int)(a) < 0))
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#define time_before(a,b) time_after(b,a)
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#define time_after_eq(a,b) \
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(typecheck(unsigned long, a) && \
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typecheck(unsigned long, b) && \
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((int)(a) - (int)(b) >= 0))
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#define time_before_eq(a,b) time_after_eq(b,a)
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#endif /* __SUPPORT_H__ */
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