PiegOS/kernel/main.cpp

//To load GDT
#include "GDT/gdt.hpp"
#include "./Helpers/memPrint.hpp"


//----- PiegOS kernel main -----
int  main(){

    //Test print a char
	/*char* letter=(char*)0xB8A00;
	*letter='H';
	letter++;
	*letter=(GREEN << 4) | BLUE;*/

    memPrint VideoRam;


    VideoRam.print("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
    VideoRam.print("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
    VideoRam.print("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
    VideoRam.print("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
    VideoRam.print("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
    VideoRam.print("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");

    //Infinite loop
	while(1);

    //Exit code
	return 0;
}



//----- PiegOS kernel boot -----
//Mangling the _boot function
extern "C" void _boot(){

    //Create Gdt instance
    Gdt gdt;

    //Load Gdt into memory
    gdt.loadGdt();

    //Init all segments and stack
    __asm__("\
        movw $0x10, %ax; \n \
        movw %ax, %ds; \n \
        movw %ax, %es \n \
        ljmp $0x08, $updateDS;\
        updateDS: \n\
        movw $0x18, %ax \n \
        movw %ax, %ss \n \
        movl $0x00B00000, %esp \n\
    ");

    //Call main function after stack pointer changing (due to C++ optimisation)
    main();
}