src/arch/x86/wp.cpp

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/***********************************************************
*PANALIX 0.06, (c) Adrian Panasiuk 2002-4                  *
*adek336[at]o2.pl, panalix.prv.pl                          *
*under GPLv3 license                                       *
*                                                          *
*panalix - small osdev project                             *
************************************************************
*       wp.cpp, version 1.0                                *
************************************************************
*                                                          *
*enable the WriteProtect bit in cr0                        *
*                                                          *
*23'08'04- first revision (1.0)                            *
*                                                          *
***********************************************************/

#include "src/common/shared.hpp"
#include "src/memory/memset.hpp"
#include "src/memory/align.hpp"
#include "src/memory/heap.hpp"
#include "src/arch/x86/cpuid.hpp"
#include "src/arch/x86/wp.hpp"

namespace Arch {
namespace x86 {
namespace WProtect {

/*setup the cr0.wp bit*/
void init()
 {
        if (cpuid_success!=1)
                sysfail("WProtect::init()- cpuid not invoked earlier");

        asm volatile(" mov %cr0, %eax\norl $0x10000,%eax\nmov %eax, %cr0 ");    //cr0.wp=1 a.k.a enable write protect
 }


   };   /*namespace WProtect*/
  };    /*namespace x86*/
 };     /*namespace Arch*/


/***********************************************************
*                                                          *
*panalix 0.06 (c) Adrian Panasiuk 2002-4                   *
*adek336[at]o2.pl, panalix.prv.pl                          *
*                                                          *
***********************************************************/

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