BarinkOS/src/kernel/kernel.cpp

#include "kernel.h"
#define GB2 262144

 extern "C" void kernel_main (void);
  
    extern "C" void early_main(unsigned long magic, unsigned long addr){
        /** initialize terminal interface */ 
        kterm_init();
        
        if (magic != MULTIBOOT_BOOTLOADER_MAGIC){
            printf("Invalid magic number: 0x%x\n",  magic);
            return;
        }

        CheckMBT(  (multiboot_info_t *) addr);

        multiboot_info_t* mbt = (multiboot_info_t*) addr;

        /* Are mmap_* valid? */
        if (CHECK_FLAG(mbt->flags, 6)){
            PhysicalMemoryManager_initialise( mbt->mmap_addr,  GB2/* Seriously dangerous hardcoded memory value*/);
            PhysicalMemoryManager_initialise_available_regions(mbt->mmap_addr, mbt->mmap_addr + mbt->mmap_length);
            PhysicalMemoryManager_deinitialise_kernel();
            extern uint8_t* kernel_begin;
            extern uint8_t* kernel_end;

            printf("Kernel MemoryMap:\n");
            printf("kernel: 0x%x - 0x%x\n", &kernel_begin , &kernel_end);         
        }

        initGDT();
        init_idt();
        // Enable interrupts
        asm volatile("STI");
        

        kernel_main();
       
    }

    extern "C" void kernel_main (void) {

   
        init_serial();



        pit_initialise();
      


        while (true){
            //Read time indefinetely 
            read_rtc();
            printf( "UTC time: %02d-%02d-%02d %02d:%02d:%02d (Ticks: %06d)  [ Formatted as YY-MM-DD h:mm:ss]\r" ,year, month, day, hour, minute, second, pit_tick);
            delay(1000);
        }
            

        
       
    }