www.pudn.com > HookAPI > Ring0.h

#ifndef RING0_H 
#define RING0_H 
 
#pragma pack(1) 
 
struct GDT_DESCRIPTOR 
{ 
  WORD Limit_0_15; 
  WORD Base_0_15; 
  BYTE Base_16_23; 
  BYTE Type         : 4; 
  BYTE System       : 1; 
  BYTE DPL          : 2; 
  BYTE Present      : 1; 
  BYTE Limit_16_19  : 4; 
  BYTE Available    : 1; 
  BYTE Reserved     : 1; 
  BYTE D_B          : 1; 
  BYTE Granularity  : 1; 
  BYTE Base_24_31; 
}; 
 
struct CALLGATE_DESCRIPTOR 
{ 
  WORD Offset_0_15; 
  WORD Selector; 
  WORD ParamCount   : 5; 
  WORD Unused       : 3; 
  WORD Type         : 4; 
  WORD System       : 1; 
  WORD DPL          : 2; 
  WORD Present      : 1; 
  WORD Offset_16_31; 
}; 
 
struct GDTR 
{ 
  WORD wGDTLimit; 
  DWORD dwGDTBase; 
}; 
 
BOOL SetPageProtection(PVOID pvAddr); 
BOOL RemovePageProtection(PVOID pvAddr); 
 
#pragma pack() 
 
#endif