BarinkOS/source/kernel/kernel.cpp

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#include "kernel.h"
extern "C" void early_main()
{
/*
* Initialize terminal interface
*/
kterm_init();
initGDT();
init_serial();
print_serial("Hello Higher half kernel!\n");
init_idt();
// Enable interrupts
asm volatile("STI");
/*
* Show a little banner for cuteness
*/
printf("|=== BarinkOS ===|\n");
printf("Kernel End Addr: 0x%x\n" , &kernel_end + KERNEL_BASE_ADDR);
uint32_t PageDirectoryEntryIndex = ((uint32_t)&kernel_end + KERNEL_BASE_ADDR ) >> 22 ;
uint32_t PageTableEntryIndex = (((uint32_t)&kernel_end + KERNEL_BASE_ADDR) >> 12) & 0x1FFF;
printf("Kernel End PDE: %d, PTE: %d\n" , PageDirectoryEntryIndex, PageTableEntryIndex);
uint32_t BootInfoStruct = BootInfoBlock_pptr + 0xC0000000;
printf("Addr BootInfostruct: 0x%x\n", BootInfoStruct);
uint32_t PageDirectoryEntryIndex2 = (BootInfoStruct ) >> 2 ;
uint32_t PageTableEntryIndex2 = (BootInfoStruct >> 12) & 0x1FFF;
printf("PDE: 0x%x, PTE: 0x%x\n", PageDirectoryEntryIndex2 , PageTableEntryIndex2 );
BootInfoBlock* BootInfo = (BootInfoBlock*) ( BootInfoBlock_pptr + 0xC0000000 );
printf("Size of BootInfoBlock: %d bytes\n", sizeof(BootInfoBlock));
printf("Bootloader information:\n");
if( BootInfo->ValidELFHeader )
{
printf("- Valid ELF Header is available!\n");
}
if(BootInfo->EnabledVBE)
{
printf("- VBE graphics mode is available!\n");
}
if(BootInfo->ValidSymbolTable)
{
printf("- Valid Symbol Table available at 0x%x.\n Tab Size: %d, str Size: %d\n", BootInfo->SymbolTableAddr, BootInfo->SymbolTabSize, BootInfo->SymbolStrSize);
}
if(BootInfo->PhysicalMemoryMapAvailable)
{
printf("- Physical Memory Map available!\n");
printf("MemoryInfoheap size : %d bytes\n", BootInfo->map_size);
// Print the memory regions
MemoryInfoBlock* currentBlock = (MemoryInfoBlock*) ((uint32_t)BootInfo->MemoryMap + KERNEL_BASE_ADDR) ;
printf( "Starting address: 0x%x\n", currentBlock);
while( (uint32_t)currentBlock->next != 0x0 )
{
if(IS_AVAILABLE_MEM(currentBlock->type)){
//printf("AVAILABLE RAM\n");
}
else if(IS_ACPI_MEM(currentBlock->type)){
//printf("ACPI MEMORY\n");
}
else if(IS_RESERVED_MEM(currentBlock->type)){
// printf("RESERVED MEMORY\n");
}
else if(IS_NVS_MEMORY(currentBlock->type)){
// printf("NVS MEMORY \n");
}
else if(IS_BADRAM_MEMORY(currentBlock->type)){
// printf("BADRAM MEMORY \n");
}
else {
// printf("(TYPE 0x%x )TYPE NOT SPECIFIED\n", currentBlock->type);
}
currentBlock = (MemoryInfoBlock*) ((uint32_t)currentBlock->next + KERNEL_BASE_ADDR );
}
// Setup PhysicalMemoryManagement
SetupPhysicalMemoryManager(BootInfo);
// Small test!
void* block = allocate_block();
void* block2 = allocate_block();
printf("Allocated addresss 1: 0x%x 2: 0x%x\n", (uint32_t)block ,(uint32_t)block2);
free_block(block);
free_block(block2);
void* block3 = allocate_block();
printf("Allocated addresss 3: 0x%x\n", (uint32_t)block3);
free_block(block3);
}
asm volatile("mov %cr0, %eax ");
asm volatile("or $1, %eax");
asm volatile("mov %eax, %cr0"); // re-enable protected mode ?
kernel_main();
}
void map_multiboot_info_structure(unsigned long addr){
// map the multiboot structure into virtual memory
// so we can gather the necessary data from it.
uint32_t pageDirectoryIndex = (addr ) >> 22;
printf("pageDirectoryIndex: %d\n", pageDirectoryIndex);
uint32_t pageTableIndex = (addr >> 12) & 0x1FFF;
printf("PagTableIndex: %d\n", pageTableIndex);
printf("boot_page_directory addr: 0x%x\n", &boot_page_directory);
printf("boot_page_table addr: 0x%x\n", &multiboot_page_table);
uint32_t* current_page_directory = &boot_page_directory;
uint32_t* needed_page_table = &multiboot_page_table - KERNEL_BASE_ADDR;
// set the page tabel reference;
current_page_directory[pageDirectoryIndex] = (uint32_t)&multiboot_page_table - KERNEL_BASE_ADDR + 0x003;
// set the page reference;
needed_page_table[ pageTableIndex ] = addr | 0x003;
// Reload CR3 to force a flush
asm("movl %cr3, %ecx;" "movl %ecx, %cr3" );
}
void PhysicalMemoryAllocatorTest(){
#ifdef UNIT_TESTS
// test alloc_block
uint8_t* memory = (uint8_t*) memAlloc.allocate_block();
printf("Got a new pointer: 0x%x\n", memory);
uint8_t* memory2 = (uint8_t*) memAlloc.allocate_block();
printf("Got a new pointer: 0x%x\n", memory2);
memAlloc.free_block((void*) memory);
uint8_t* newBlockPlse = (uint8_t*) memAlloc.allocate_block();
#endif
}
extern "C" void kernel_main () {
pit_initialise();
// Create a dummy BootInfo object
// TODO: This should be done properly or the dependency should
// be removed from the SuperVisorTerminal.
BootInfo* bootinfo = {};
startSuperVisorTerminal(bootinfo);
}