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#ifndef _LINUX_KERNEL_H
#define _LINUX_KERNEL_H
/*
* 'kernel.h' contains some often-used function prototypes etc
*/
#include <xen/types.h>
/*
* min()/max() macros that also do
* strict type-checking.. See the
* "unnecessary" pointer comparison.
*/
#define min(x,y) ({ \
const typeof(x) _x = (x); \
const typeof(y) _y = (y); \
(void) (&_x == &_y); \
_x < _y ? _x : _y; })
#define max(x,y) ({ \
const typeof(x) _x = (x); \
const typeof(y) _y = (y); \
(void) (&_x == &_y); \
_x > _y ? _x : _y; })
/*
* ..and if you can't take the strict
* types, you can specify one yourself.
*
* Or not use min/max at all, of course.
*/
#define min_t(type,x,y) \
({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
#define max_t(type,x,y) \
({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
/*
* pre-processor, array size, and bit field width suitable variants;
* please don't use in "normal" expressions.
*/
#define MIN(x,y) ((x) < (y) ? (x) : (y))
#define MAX(x,y) ((x) > (y) ? (x) : (y))
/**
* 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) ({ \
typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
/*
* Check at compile time that something is of a particular type.
* Always evaluates to 1 so you may use it easily in comparisons.
*/
#define typecheck(type,x) \
({ type __dummy; \
typeof(x) __dummy2; \
(void)(&__dummy == &__dummy2); \
1; \
})
extern char _start[], _end[];
#define is_kernel(p) ({ \
char *__p = (char *)(unsigned long)(p); \
(__p >= _start) && (__p < _end); \
})
extern char _stext[], _etext[];
#define is_kernel_text(p) ({ \
char *__p = (char *)(unsigned long)(p); \
(__p >= _stext) && (__p < _etext); \
})
extern const char _srodata[], _erodata[];
#define is_kernel_rodata(p) ({ \
const char *__p = (const char *)(unsigned long)(p); \
(__p >= _srodata) && (__p < _erodata); \
})
extern char _sinittext[], _einittext[];
#define is_kernel_inittext(p) ({ \
char *__p = (char *)(unsigned long)(p); \
(__p >= _sinittext) && (__p < _einittext); \
})
extern enum system_state {
SYS_STATE_early_boot,
SYS_STATE_boot,
SYS_STATE_active,
SYS_STATE_suspend,
SYS_STATE_resume
} system_state;
bool_t is_active_kernel_text(unsigned long addr);
#endif /* _LINUX_KERNEL_H */
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