Makefile

@@ -5,7 +5,7 @@ CC = ${HOME}/opt/cross/bin/i686-elf-gcc
 CPP = ${HOME}/opt/cross/bin/i686-elf-g++ 
 CFLAGS =  -ffreestanding -Og -ggdb  -Wall -Wextra
 
-OFILES =$(BUILD_DIR)/boot.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/memory.o  $(BUILD_DIR)/paging.o	$(BUILD_DIR)/pit.o 	$(BUILD_DIR)/time.o	$(BUILD_DIR)/keyboard.o	 $(BUILD_DIR)/io.o 	$(BUILD_DIR)/gdtc.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/sv-terminal.o $(BUILD_DIR)/string.o  
+OFILES =$(BUILD_DIR)/boot.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/memory.o  $(BUILD_DIR)/paging.o	$(BUILD_DIR)/pit.o 	$(BUILD_DIR)/time.o	$(BUILD_DIR)/keyboard.o	 $(BUILD_DIR)/io.o 	$(BUILD_DIR)/gdtc.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/sv-terminal.o $(BUILD_DIR)/string.o  $(BUILD_DIR)/launcher.o 
 
 SRC_DIR = src
 BUILD_DIR = build
@@ -102,4 +102,7 @@ $(BUILD_DIR)/memory.o:
 	$(CPP) -c $(SRC_DIR)/kernel/Memory/memory.cpp  -o $(BUILD_DIR)/memory.o $(CFLAGS) -fno-exceptions -fno-rtti
 
 $(BUILD_DIR)/paging.o:
-	$(CPP) -c $(SRC_DIR)/kernel/Memory/paging.cpp -o $(BUILD_DIR)/paging.o $(CFLAGS) -fno-exceptions -fno-rtti
+	$(CPP) -c $(SRC_DIR)/kernel/Memory/paging.cpp -o $(BUILD_DIR)/paging.o $(CFLAGS) -fno-exceptions -fno-rtti
+
+$(BUILD_DIR)/launcher.o:
+	$(CPP) -c $(SRC_DIR)/kernel/KernelLauncher/launcher.cpp -o $(BUILD_DIR)/launcher.o $(CFLAGS) -fno-exceptions -fno-rtti

src/grub.cfg

@@ -1,8 +1,3 @@
-GRUB_DEFAULT=0
-GRUB_TIMEOUT=-1
-GRUB_HIDDEN_TIMEOUT=0
-GRUB_HIDDEN_TIMEOUT_QUITE=true
-
 menuentry "BarinkOS" {
     multiboot /boot/myos.bin
 }

src/kernel/KernelLauncher/boot.s

@@ -47,12 +47,7 @@ _start:
 	movl $(boot_page_table - 0xC0000000), %edi
 	# Map address 0
 	movl $0, %esi
-	# Map 1023 pages the 1024th being the VGA text buffer
+1:	
-	movl $1023, %ecx
-
-1:	# Map the kernel 
-	cmpl $_kernel_start, %esi
-	jl 2f
 	cmpl $(_kernel_end - 0xC0000000), %esi
 	jge 3f
 
@@ -125,12 +120,8 @@ isPaging:
 
 	call early_main
 
-	mov %cr0, %eax 
-	or $1, %eax
-	mov %eax, %cr0 
 
-	
+
-	//call kernel_main
 
 
 	cli

src/kernel/KernelLauncher/bootcheck.h

@@ -1,7 +1,7 @@
 #pragma once 
 #include "../multiboot.h"
 #define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
-
+#define __VERBOSE__
 #include "../Terminal/kterm.h"
 
 

src/kernel/KernelLauncher/launcher.cpp

@@ -0,0 +1,28 @@
+#include <stdint.h>
+#include <stddef.h>
+
+void put_char(char ch, size_t x, size_t y ){
+    *((uint16_t*)0xb8000+(y * 80 + x)) = ch | ((7 | 0 << 4) << 8);
+}
+
+void write_ln(char* s, size_t length, size_t x , size_t y)
+{
+  // Because read only data is linked at a virtual address we'll need to convert
+  // the string adddres from virtual to phys.
+  s = s - 0xC0000000;
+  size_t column , row;
+  column = x;
+  row = y;
+  for(int i = 0; i < length ; i ++)
+  {
+    
+    put_char(s[i] , column,row );
+    column ++;
+
+  }
+  
+}
+
+extern "C" void testLauncher  () {
+  write_ln("hello", 5 ,0,0);
+}

src/kernel/Memory/KernelHeap.h

@@ -0,0 +1,2 @@
+#pragma once 
+

src/kernel/Memory/PhysicalMemoryManager.cpp

@@ -102,11 +102,13 @@ void PhysicalMemory::deallocate_region(uint32_t  StartAddress , uint32_t size )
 
 
 void mapMultibootMemoryMap( MemoryInfo* memInfo , multiboot_info_t *mbt) {
-    printf("mmap_addr = 0x%x, mmap_length = 0x%x\n",
+
-    (unsigned) mbt->mmap_addr, (unsigned) mbt->mmap_length);
+    printf("mmap_addr = 0x%x, mmap_length = 0x%x\n", (unsigned) mbt->mmap_addr , (unsigned) mbt->mmap_length );
+
+
     multiboot_memory_map_t *mmap = (multiboot_memory_map_t*) mbt->mmap_addr;
 
-    for (;  (unsigned long) mmap < mbt->mmap_addr + mbt->mmap_length;  mmap = (multiboot_memory_map_t *) ((unsigned long) mmap + mmap->size + sizeof(mmap->size))){
+    for (;  (unsigned long) mmap <  mbt->mmap_addr + mbt->mmap_length;  mmap = (multiboot_memory_map_t *) ((unsigned long) mmap + mmap->size + sizeof(mmap->size))){
 
             if ( mmap->type == MULTIBOOT_MEMORY_AVAILABLE){
         

src/kernel/Memory/PhysicalMemoryManager.h

@@ -8,8 +8,10 @@
 #include "../Lib/mem.h"
 #include "../bitmap.h"
 
+// Asumming 32 bit x86 for now!
 #define BLOCK_SIZE 4092
-#define BLOCKS_PER_WORD 32 // A word is 16 bit in x86 machines according to my google search results!
+#define WORD_SIZE 2 
+#define BLOCKS_PER_WORD 32 
 
 #define KB_TO_BLOCKS(x) (x  / BLOCK_SIZE)
 #define IS_ALIGNED(addr, align) !((addr) & ~((align) - 1))

src/kernel/Memory/VirtualMemoryManager.cpp

@@ -1,7 +1,6 @@
 #include "paging.h"
-/*PageDirectoryEntry kernel_directory[MAX_DIRECTORY_ENTRIES]__attribute__((aligned(4096)));
+// PageDirectoryEntry kernel_directory[MAX_DIRECTORY_ENTRIES]__attribute__((aligned(4096)));
-
+// PageTableEntry first_page_table[MAX_PAGE_TABLE_ENTRIES]__attribute__((aligned(4096)));
-//PageTableEntry first_page_table[MAX_PAGE_TABLE_ENTRIES]__attribute__((aligned(4096)));
 
 void IdentityMap (){
         printf("\nInit paging\n");
@@ -11,7 +10,7 @@ void IdentityMap (){
     int i = 0;
     while ( i < 1024)
     {
-        kernel_directory[i] = 0x2;
+     //   kernel_directory[i] = 0x2;
         i++;
     }
 
@@ -20,7 +19,7 @@ void IdentityMap (){
     unsigned int j ;
     for( j = 0;  j < 1024; j++ )
     {
-        first_page_table[j] = (j * 0x1000) | 3 ;
+      //  first_page_table[j] = (j * 0x1000) | 3 ;
         
         //Attributes: 
         //Supervisor Level ,
@@ -32,7 +31,7 @@ void IdentityMap (){
 
     // Put the page table in the page directory 
     // attributes: supervisor level, read/write, present;
-    kernel_directory[0] = ((unsigned int)first_page_table) | 3;
+   // kernel_directory[0] = ((unsigned int)first_page_table) | 3;
 
     printf("Init paging DONE\n");
 }
@@ -43,10 +42,10 @@ void InitializePaging()
         Initial kernel page directory
          set all page tables to not present
     */
-   /*
+   
     for (int i = 0; i < MAX_DIRECTORY_ENTRIES; i++)
     {
-        kernel_directory[i] = 0x2;
+    //    kernel_directory[i] = 0x2;
     }
 
     // BIOS Address Identity mapping 
@@ -58,20 +57,20 @@ void InitializePaging()
     uint8_t NUM_PDE = BIOSAddr_Max / (4 * 1024 * 1024);
 
     printf("The first 8MiB require %d Page Directory Entries\n", NUM_PDE);
-    */
+    
-/*
+
     for( int i = 0; i < NUM_PDE; i++)
     {
         // setup a page table 
-        PageTableEntry pagetable[MAX_PAGE_TABLE_ENTRIES] = PhysicalMemory::allocate_block(); // TODO :: Physical memory manager functions should be available here.
+       // PageTableEntry pagetable[MAX_PAGE_TABLE_ENTRIES] = PhysicalMemory::allocate_block(); // TODO :: Physical memory manager functions should be available here.
 
         for(int j = 0; j < MAX_PAGE_TABLE_ENTRIES; j++)
         {
-            pagetable[j] = ( j  *  4096 ) | 3;
+       //     pagetable[j] = ( j  *  4096 ) | 3;
         }
 
         // add page table as page directory entry 
-        kernel_directory[i] =  ( (unsigned int) pagetable ) | 3;
+     //   kernel_directory[i] =  ( (unsigned int) pagetable ) | 3;
     }
 
     //  map the kernel space 
@@ -87,11 +86,11 @@ void InitializePaging()
 
     for(int i = 0; i < NUM_PDE; i++)
     {
-        PageTableEntry pageTable [MAX_PAGE_TABLE_ENTRIES] = PhysicalMemory::allocate_block();
+     //   PageTableEntry pageTable [MAX_PAGE_TABLE_ENTRIES] = PhysicalMemory::allocate_block();
 
         for(int j = 0; j < MAX_PAGE_TABLE_ENTRIES; j++)
         {
-            pageTable[j] = ( j * 4096) | 3; // NOTE: Check if page is actually supposed to be present
+        //    pageTable[j] = ( j * 4096) | 3; // NOTE: Check if page is actually supposed to be present
         }
 
         // TODO: Calculate Page Directory index 
@@ -145,9 +144,9 @@ void Enable()
     CR0 =  GetCR0();
     printf("PG bit = %d \n" , GET_PG_BIT(CR0));
 
-    printf("Load into CR3 address: 0x%x\n", (uint32_t)(&kernel_directory[0]));
+   // printf("Load into CR3 address: 0x%x\n", (uint32_t)(&kernel_directory[0]));
-    loadPageDirectory(&kernel_directory[0]);
+   // loadPageDirectory(&kernel_directory[0]);
-    enablePaging();
+   // enablePaging();
 
     printf("Paging enabled!\n");
 
@@ -170,4 +169,3 @@ void Enable()
     }
 
 }
-*/

src/kernel/Terminal/kterm.h

@@ -1,7 +1,6 @@
 #pragma once 
 #include <stdint.h>
 #include <stddef.h>
-#include <stdint.h>
 #include <stdbool.h>
 
 #include "../Drivers/VGA/colors.h"

src/kernel/kernel.cpp

@@ -7,6 +7,9 @@ extern "C" uint32_t multiboot_page_table;
 
 const uint32_t KERNEL_BASE_ADDR = 0xC0000000;
 extern "C" void early_main(unsigned long magic, unsigned long addr){
+
+    // Convert MBI address to higher quarter kernel space
+    addr += KERNEL_BASE_ADDR;
     /** 
      * Initialize terminal interface 
      * NOTE: This should be done later on , the magic value should be checked first.
@@ -20,7 +23,6 @@ extern "C" void early_main(unsigned long magic, unsigned long addr){
     // Enable interrupts
     asm volatile("STI");
 
-    map_multiboot_info_structure(addr);
    
     printf("DEBUG:\n Magic: 0x%x\n MBT_addr: 0x%x\n", magic, addr);
     /**
@@ -78,7 +80,7 @@ extern "C" void early_main(unsigned long magic, unsigned long addr){
         printf("Kernel Begin Pointer: 0x%x, Kernel end pointer: 0x%x\n", &kernel_begin , &kernel_end );
        
        
-        multiboot_memory_map_t *mmap = (multiboot_memory_map_t*) mbt->mmap_addr;
+        multiboot_memory_map_t *mmap = (multiboot_memory_map_t*) (mbt->mmap_addr + KERNEL_BASE_ADDR) ;
 
         for (;  (unsigned long) mmap < mbt->mmap_addr + mbt->mmap_length;  mmap = (multiboot_memory_map_t *) ((unsigned long) mmap + mmap->size + sizeof(mmap->size))){
 
@@ -120,8 +122,10 @@ extern "C" void early_main(unsigned long magic, unsigned long addr){
         printf("memory flag not set!");
     }
     
-    CheckMBT(  (multiboot_info_t *) addr);
+    CheckMBT( (multiboot_info_t *) addr);
-
+	asm volatile("mov %cr0, %eax ");
+    asm volatile("or $1, %eax");
+    asm volatile("mov %eax, %cr0");
     kernel_main(&bootinfo);
     
 }

src/kernel/linker.ld

@@ -16,6 +16,7 @@ SECTIONS
 
 	.multiboot.text : {
 		*(multiboot.text)
+		*launcher.o(.text)
 	}
 
 	. += 0xC0000000; /* Addresses in the following code need to be above the 3Gb mark */