macros.h

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#ifndef X86_MATANEL_MACROS_H
#define X86_MATANEL_MACROS_H
#include <stdint.h>

#ifndef CONTAINING_RECORD
#define CONTAINING_RECORD(ptr, type, member) \
    ((type *)((char *)(ptr) - offsetof(type, member)))
#endif
 
#undef SIZE_T_MAX
#ifndef SIZE_T_MAX
#define SIZE_T_MAX (size_t)-1
#endif
 
#undef UINT64_T_MAX
#ifndef UINT64_T_MAX
#define UINT64_T_MAX (uint64_t)-1
#endif
 
extern uint8_t kernel_start;
#define LK_KERNEL_START &kernel_start
 
extern uint8_t kernel_end;
#define LK_KERNEL_END &kernel_end
 
#define LK_KERNEL_SIZE (LK_KERNEL_END - LK_KERNEL_START)
 
#ifndef _MSC_VER
#define MAX(a, b) ({ \
    __typeof__(a) _a = (a); \
    __typeof__(b) _b = (b); \
    _a > _b ? _a : _b; \
})
 
#define MIN(a, b) ({ \
    __typeof__(a) _a = (a); \
    __typeof__(b) _b = (b); \
    _a > _b ? _b : _a; \
})
#else
#define MAX(a,b) (0)
#define MIN(a,b) (0)
#endif
 
#if defined __GNUC__
#define RETADDR(level) __builtin_return_address(level)
#else
#define RETADDR(level) (void)(level)
#endif
 
// 'likely' hints to the compiler that the condition is expected to be true most of the time.
// It allows the compiler to optimize branch prediction.
#define likely(x)       __builtin_expect(!!(x), 1)
 
// 'unlikely' hints to the compiler that the condition is expected to be false most of the time.
// Useful for error handling or rare cases.
#define unlikely(x)     __builtin_expect(!!(x), 0)
 
#define FREEZE() __cli(); __hlt()
 
#if !defined(__GNUC__)
#define FIELD_OFFSET(t,f)       ((uint32_t)(uint32_t*)&(((t*) 0)->f))
#else
#define FIELD_OFFSET(t,f)       ((uint32_t)__builtin_offsetof(t,f))
#endif
 
#endif