Couple of small changes

* Commented out the map page function call to handle page not present
* Mapped the ACPI_RECLAIMABLE_MEMORY
* Set VBE to false when VBE is not initialized by the bootloader

.gdbinit

@@ -0,0 +1,7 @@
+target remote localhost:1234
+
+file root/boot/myos.bin
+symbol-file kernel.sym
+
+break prekernel/prekernel.cpp:18
+continue

.gitignore

@@ -11,3 +11,5 @@ root/
 *.a
 
 
+/CoreLib/warnings.log
+/kernel/warnings.log

CoreLib/Makefile

@@ -15,8 +15,6 @@ $(OUTPUTFILE): $(OFILES)
 	pwd
 	ar -rc $(OUTPUTFILE) $(OFILES)
 
-
-
 $(OBJ_FOLDER)/ctype.o: ctype.cpp
 	$(CPP) -c ctype.cpp -o $(OBJ_FOLDER)/ctype.o $(CFLAGS)
 

CoreLib/Memory.cpp

@@ -16,16 +16,14 @@ void* memset (void* ptr, int value, size_t num)
 
 int memcmp( const void* ptr1, const void* ptr2, size_t num)
 {
-    const unsigned char * cs = (const unsigned char*) ptr1;
+    auto* cs = (const unsigned char*) ptr1;
-    const unsigned char * ct = (const unsigned char*) ptr2;
+    auto* ct = (const unsigned char*) ptr2;
 
 
     for (int i = 0 ; i < num ; i++, cs++, ct++ ){
-        if( *cs < *ct){
+        if( *cs != *ct)
-            return -1;
+            return *cs - *ct;
-        } else if( *cs > *ct){
+
-            return 1;
-        }
     }
 
     return 0;

CoreLib/ctype.cpp

@@ -108,7 +108,7 @@ int isprint (int ch){
         return 1;
     if(isspace(ch))
         return 1;
-
+    return 0;
 }
 
 

kernel/Makefile

@@ -39,7 +39,7 @@ OFILES = $(OBJ_DIR)/boot.o	\
 OBJ_LINK_LIST = $(CRTI_OBJ) $(CRTBEGIN_OBJ) $(OFILES) $(CRTEND_OBJ) $(CRTN_OBJ)  
 INTERNAL_OBJS = $(CRTI_OBJ) $(OFILES) $(CRTN_OBJ)
 
-all:  build
+all: clean build
 
 clean:
 	rm $(OBJ_DIR)/* -r
@@ -49,7 +49,7 @@ build: $(OBJ_LINK_LIST)
 	$(CPP) -T linker.ld -o $(BUILD_DIR)/myos.bin -ffreestanding -ggdb -Og -nostdlib $(OBJ_LINK_LIST) -lgcc -L ../build/CoreLib -lCoreLib
 
 # C++ definition -> Object files
-$(OBJ_DIR)/kernel.o:
+$(OBJ_DIR)/kernel.o: kernel.cpp
 	$(CPP) -c kernel.cpp -o $(OBJ_DIR)/kernel.o $(CFLAGS) -fno-exceptions -fno-rtti
 
 $(OBJ_DIR)/kterm.o:

kernel/acpi/acpi.cpp

@@ -1,26 +1,67 @@
 #include "acpi.h"
+#include "../../CoreLib/Memory.h"
+#include "../memory/VirtualMemoryManager.h"
+
 RSDPDescriptor* ACPI::rsd_ptr;
+RSCPDescriptor20* ACPI::rsd2_ptr;
 RSDT* ACPI::rsd_table;
 
-
+const int KERNEL_OFFSET = 0xC0000000;
 
 void ACPI::initialize(){
-
     // Find the Root System Description Pointer
     ACPI::rsd_ptr = FindRSD();
+    printf("RSD address: 0x%x\n", ACPI::rsd_ptr);
+    printRSD(rsd_ptr);
 
-    // is it valid
+
-    int sum = 0;
+    if( rsd_ptr->Revision == 0 ){
-    for (int i =0; i < 20 ; i++) {
+        // Using version 1.0 of the ACPI specification
-        sum += ((char*)rsd_ptr)[i];
+        int sum = rsd_ptr->Checksum;
+        for (int i =0; i < sizeof(RSDPDescriptor) ; i++) {
+            sum += ((char*)rsd_ptr)[i];
+        }
+
+        printf(" 0x%x sum\n", sum);
+        if(sum & 0xfff0)
+            printf("valid rsd!\n");
+        else
+            printf("invalid rsd\n");
+
+        printf("rsdp: 0x%x\n", rsd_ptr);
+
+        printf("0x%x address\n", (rsd_ptr->RsdtAddress));
+        Immediate_Map(rsd_ptr->RsdtAddress + KERNEL_OFFSET, rsd_ptr->RsdtAddress);
+
+        RSDT* rootSystemDescriptionTable = (RSDT*)(rsd_ptr->RsdtAddress + KERNEL_OFFSET);
+        //printf("0x%x Root System Descriptor address\n", rootSystemDescriptionTable);
+        // checksum it, but we'll ignore it for now
+        printf("signature ");
+        for (int i = 0; i < 4; i++) {
+            kterm_put( rootSystemDescriptionTable->h.Signature[i]);
+        }
+        kterm_put('\n');
+
+
+        int entries = (rootSystemDescriptionTable->h.Length - sizeof (rootSystemDescriptionTable->h)) /4;
+        printf("%d num entries\n", entries);
+        for( int i = 0; i < entries; i++){
+            ACPISDTHeader* h = (ACPISDTHeader*) rootSystemDescriptionTable->PointerToSDT + i ;
+            if(strncmp(h->Signature, "FACP", 4)){
+                printf("Found FACP Entry!\n");
+            }
+        }
+
+
+    } else{
+        // parse it as of version2.0
+        printf("rsd2_ptr\n");
+        ACPI::rsd2_ptr = (RSCPDescriptor20*)rsd_ptr;
     }
 
-    printf(" 0x%x sum\n", sum);
-    return;
 
-    //  Get the Root System Description Table
-    RSDT* rootSystemDescriptionTable =  getRSDT((RSDPDescriptor *) rsd_ptr);
 
+/*
     auto tableHeader = &rootSystemDescriptionTable->h;
 
     // do checksum
@@ -31,5 +72,5 @@ void ACPI::initialize(){
     }
 
     if( sum != 0)
-        printf("Table invalid!");
+        printf("Table invalid!");*/
 }

kernel/acpi/acpi.h

@@ -6,8 +6,9 @@ class ACPI {
         
         // In the future ACPI might start
         // doing more systems initialization
-        
+
+    static RSDPDescriptor* rsd_ptr;
+    static RSCPDescriptor20* rsd2_ptr;
+    static RSDT* rsd_table;
     private:
-       static RSDPDescriptor* rsd_ptr;
-       static RSDT* rsd_table;
 };

kernel/acpi/rsdp.cpp

@@ -1,5 +1,6 @@
 #include "rsdp.h"
 #include "../memory/VirtualMemoryManager.h"
+#include "../../CoreLib/Memory.h"
 
 
 void printRSD(RSDPDescriptor* rsd){
@@ -16,25 +17,28 @@ void printRSD(RSDPDescriptor* rsd){
     kterm_put('\n');
 
     printf("Revision: %d\n", rsd->Revision);
-    printf("RSDT Address: 0x%x\n", rsd->RsdtAddress );
 }
 
 RSDPDescriptor* FindRSD(){
     char* memory_byte = (char*) 0x000f2e14;
     const void* string = "RSD PTR ";
 
-    for( ; (uint32_t) memory_byte < 0x00100000; memory_byte+=10){
+
+    for( ; (uint32_t) memory_byte < 0x0100000; memory_byte+=10){
         if( memcmp(memory_byte , string , 8 ) ==  0 ) {
         printf("RSD PTR found at 0x%x !\n", memory_byte);
+        return (RSDPDescriptor*) memory_byte;
         break;
         }
     }
-    return (RSDPDescriptor*) memory_byte;
+
+    memory_byte = (char*) 0x000E0000;
+    for ( ;(uint32_t) memory_byte < 0x000FFFFF; memory_byte += 1)
+    {
+        if( memcmp(memory_byte , string , 8 ) ==  0 ) {
+            printf("RSD PTR found at 0x%x !\n", memory_byte);
+            return (RSDPDescriptor*) memory_byte;
+            break;
+        }
+    }
 }
-
-
-RSDT* getRSDT(RSDPDescriptor* rsd){
-    printf("rsdt Address: 0x%x\n", rsd->RsdtAddress);
-    return (RSDT*)rsd->RsdtAddress ;
-
-}

kernel/acpi/rsdp.h

@@ -3,13 +3,6 @@
 #include <CoreLib/Memory.h>
 #include <stdint-gcc.h>
 
-struct RSDPDescriptor {
-    char signature[8];
-    uint8_t Checksum ;
-    char OEMID [6];
-    uint8_t Revision;
-    uint32_t RsdtAddress;
-}__attribute__((packed));
 
 struct ACPISDTHeader{
     char Signature[4];
@@ -23,11 +16,28 @@ struct ACPISDTHeader{
     uint32_t CreatorRevision;
 };
 
-
 struct RSDT{
     struct ACPISDTHeader h;
-    uint32_t PointerToSDT[]; // Length of array : (header.Length - sizeof(header))/ 4
+    uint32_t *PointerToSDT; // Length of array : (header.Length - sizeof(header))/ 4
 }__attribute__((packed));
+
+
+struct RSDPDescriptor {
+    char signature[8];
+    uint8_t Checksum ;
+    char OEMID [6];
+    uint8_t Revision;
+    uint32_t RsdtAddress;
+}__attribute__((packed));
+
+struct RSCPDescriptor20{
+   RSDPDescriptor base;
+   uint32_t Length;
+   uint64_t XsdtAddress;
+   uint8_t ExtendedChecksum;
+   uint8_t reserved[3];
+}__attribute__((packed));
+
 RSDPDescriptor* FindRSD();
 
 void printRSD(RSDPDescriptor* rsd);

kernel/interrupts/idt.cpp

@@ -3,6 +3,9 @@
 #include "../drivers/ps-2/keyboard.h"
 #include "../i386/processor.h"
 #include "../memory/VirtualMemoryManager.h"
+#include "../syscalls.h"
+
+
 IDT_entry idt_table[256];
 IDT_ptr idt_ptr;
 
@@ -18,7 +21,7 @@ void set_id_entry (uint8_t num , uint32_t base, uint16_t sel,  uint8_t flags){
 
 void irs_handler (registers* regs) {
      uint32_t FaultingAddress;
-        //printf("(IRS) Interrupt number: %d \r", regs.int_no);
+        printf("(IRS) Interrupt number: %d \n EAX: ", regs->int_no, regs->eax);
         switch (regs->int_no)
         {
         case 0:
@@ -188,7 +191,7 @@ void irs_handler (registers* regs) {
                 printf("* Page protection violation!\n");
             } else{
                 printf("* Page not-present!\n");
-                Immediate_Map(FaultingAddress, FaultingAddress - 0xC0000000);
+                //Immediate_Map(FaultingAddress, FaultingAddress);
              
             }
 
@@ -259,6 +262,29 @@ void irs_handler (registers* regs) {
             printf("EBP: 0x%x\n", regs->ebp); 
         break;
 
+        case 50:
+            printf("SYSTEMCALL\n");
+            printf("EAX 0x%x\n", regs->eax);
+
+                switch (regs->eax) {
+                    case 0x0:
+                        printf("test!\n");
+                        break;
+                    case 0x5:
+                        sys_open();
+                        break;
+                    case 0x10:
+                        sys_read((FILE*)regs->ebx, (char*)regs->ecx);
+                        break;
+                    case 0x20:
+                        sys_write((FILE*)regs->ebx, (const char*)regs->ecx, regs->edx);
+                        break;
+                    case 0x666:
+                        sys_version();
+                        break;
+
+                };
+        break;
         default:
             // PANIC!!!
             break;
@@ -269,9 +295,6 @@ void irs_handler (registers* regs) {
 }
 
 void irq_handler (registers regs) {
-
-    
-
     switch (regs.int_no) {
     case 0:
             pit_tick++;
@@ -328,7 +351,7 @@ void irq_handler (registers regs) {
 }
 
 void initidt(){
-    // Initialise the IDT pointer
+    // Initialize the IDT pointer
     idt_ptr.length = sizeof(IDT_entry) * 255;
     idt_ptr.base = (uint32_t)&idt_table;
 
@@ -371,7 +394,7 @@ void initidt(){
     set_id_entry(30, (uint32_t) irs30 , 0x08, 0x8E);
     set_id_entry(31, (uint32_t) irs31 , 0x08, 0x8E);
 
-
+    set_id_entry(0x50, (uint32_t) irs50, 0x08, 0x8E);
     //print_serial("Remapping PIC\n");
     PIC_remap(0x20, 0x28);
 

kernel/interrupts/idt.h

@@ -70,6 +70,7 @@ extern "C" {
     extern void irs29 ();
     extern void irs30 ();
     extern void irs31 ();
+    extern void irs50();
 
 
 

kernel/irq_table.s

@@ -1,115 +1,32 @@
 .globl irq0
-irq0:
-	cli 
-	push $0
-	push $0
-	jmp irq_common
 
-.globl irq1
+.macro IRQ NAME, VECTOR
-irq1:
+    .globl irq\NAME
-	cli 
+    irq\NAME:
-	push $0
+        cli
-	push $1
+        push $0
-	jmp irq_common
+        push \VECTOR
+        jmp irq_common
+.endm
 
-.globl irq2
+IRQ 0 $0
-irq2:
+IRQ 1 $1
-	cli 
+IRQ 2 $2
-	push $0
+IRQ 3 $3
-	push $2
+IRQ 4 $4
-	jmp irq_common
+IRQ 5 $5
-
+IRQ 6 $6
-.globl irq3
+IRQ 7 $7
-irq3:
+IRQ 8 $8
-	cli 
+IRQ 9 $9
-	push $0
+IRQ 10 $10
-	push $3
+IRQ 11 $11
-	jmp irq_common
+IRQ 12 $12
-
+IRQ 13 $13
-.globl irq4
+IRQ 14 $14
-irq4:
+IRQ 15 $15
-	cli 
-	push $0
-	push $4
-	jmp irq_common
-
-.globl irq5
-irq5:
-	cli 
-	push $0
-	push $5
-	jmp irq_common
-
-.globl irq6
-irq6:
-	cli 
-	push $0
-	push $6
-	jmp irq_common
-
-.globl irq7
-irq7:
-	cli 
-	push $0
-	push $7
-	jmp irq_common
-
-.globl irq8
-irq8:
-	cli 
-	push $0
-	push $8
-	jmp irq_common
-
-.globl irq9
-irq9:
-	cli 
-	push $0
-	push $9
-	jmp irq_common
-
-.globl irq10
-irq10:
-	cli 
-	push $0
-	push $10
-	jmp irq_common
-
-.globl irq11
-irq11:
-	cli 
-	push $0
-	push $11
-	jmp irq_common
 
 
-.globl irq12
-irq12:
-	cli 
-	push $0
-	push $12
-	jmp irq_common
-
-.globl irq13
-irq13:
-	cli 
-	push $0
-	push $13
-	jmp irq_common
-
-.globl irq14
-irq14:
-	cli 
-	push $0
-	push $14
-	jmp irq_common
-
-.globl irq15
-irq15:
-	cli 
-	push $0
-	push $15
-	jmp irq_common
 
 irq_common:
 	pusha

kernel/irs_table.s

@@ -53,7 +53,7 @@ ISR_NOERRORCODE 28 $28
 ISR_NOERRORCODE 29 $29
 ISR_NOERRORCODE 30 $30
 ISR_NOERRORCODE 31 $31
-
+ISR_NOERRORCODE 50 $50
 
 irs_common:
 	pusha 				# Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
@@ -74,7 +74,7 @@ irs_common:
 
 	call irs_handler
 	
-	pop %eax
+	pop %eax        // pop stack pointer
 	pop %ebx		// reload ther orignal data segment descriptor
 	mov %bx, %ds
 	mov %bx, %es
@@ -82,6 +82,6 @@ irs_common:
 	mov %bx, %gs
 
 	popa
-	add  $12, %esp  # cleans push error and irs code
+	add  $8, %esp  # cleans push error and irs code
 
 	iret # pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP

kernel/kernel.cpp

@@ -9,43 +9,21 @@
 #include "drivers/vga/VBE.h"
 #include "pci/pci.h"
 #include "drivers/pit/pit.h"
-#include "acpi/acpi.h"
 #include "i386/processor.h"
 #include "terminal/kterm.h"
 #include "interrupts/idt.h"
 #include "serial.h"
 #include "storage/vfs/vfs.h"
 #include "storage/filesystems/FAT/FAT.h"
-#include "../CoreLib/Memory.h"
+#include "acpi/acpi.h"
+#include "memory/VirtualMemoryManager.h"
 
 
+extern BootInfoBlock* BIB;
 extern "C"  void LoadGlobalDescriptorTable();
 extern "C" void jump_usermode();
-extern BootInfoBlock* BIB;
 
-extern "C" void kernel ()
+void initBootDrive(){
-{
-
-    init_serial();
-    kterm_init();
-
-    setup_tss();
-    initGDT();
-    initidt();
-    LoadGlobalDescriptorTable();
-    flush_tss();
-    printf("Memory setup complete!\n");
-
-    // Enable interrupts
-    asm volatile("STI");
-
-    initHeap();
-    pit_initialise();
-    ACPI::initialize();
-
-    PCI::Scan();
-    processor::initialize();
-    processor::enable_protectedMode();
     printf("Boot device: 0x%x\n", BIB->bootDeviceID);
     unsigned int part3 = BIB->bootDeviceID & 0xFF;
     unsigned int part2 = (BIB->bootDeviceID & 0xFF00) >> 8;
@@ -58,32 +36,47 @@ extern "C" void kernel ()
 
     printf("Part1: %d, Part2: %d, Part3: %d\n", part1, part2 , part3);
     ATAPIO::Identify(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER);
+}
 
+extern "C" void kernel ()
+{
+    init_serial();
+    kterm_init();
+    print_serial("kterm initialized...\n");
+    setup_tss();
+    initGDT();
+    initidt();
+    LoadGlobalDescriptorTable();
+    flush_tss();
+    printf("Memory setup complete!\n");
+    print_serial("Memory initialized....\n");
+    // Enable interrupts
+    asm volatile("STI");
+    initHeap();
+    print_serial("Heap initialized...\n");
+    //pit_initialise();
+
+
+    //ACPI::initialize();
+    //PCI::Scan();
+    processor::initialize();
+    processor::enable_protectedMode();
+    initBootDrive();
     VirtualFileSystem::initialize();
 
-    printf("Lets open hello.txt\n");
+    print_serial("Run test!");
-    auto fontFile = VirtualFileSystem::open("/HELLO   TXT", 0);
+#define VFS_EXAMPLE
-    if(fontFile->flags == 0){
+#ifdef VFS_EXAMPLE
-        uint16_t* contents = (uint16_t*) malloc(sizeof(uint16_t) * 256);
+    auto fontFile = VirtualFileSystem::open("/FONT    PSF", 0);
-        fontFile->read(fontFile, contents, 512);
+    printf("Size of font file: %d bytes", fontFile->root->size); // COOL This Works like a charm
-
+#endif
-       for(int i =0 ; i < fontFile->root->size; i++ ){
-            kterm_put(contents[i] & 0x00ff);
-            kterm_put(contents[i] >> 8);
-        }
-        kterm_put('\n');
-        free((void*)contents);
-    }else{
-        printf("Could not find file\n");
-    }
-
-
 
 #ifdef USERMODE_RELEASE
     // Lets jump into user mode
     jump_usermode();
 #else
     startSuperVisorTerminal();
+
 #endif
 
 }

kernel/memory/VirtualMemoryManager.cpp

@@ -1,4 +1,6 @@
 #include "VirtualMemoryManager.h"
+#include "../../CoreLib/Memory.h"
+
 #define ALIGN(addr, align) (((addr) & ~((align) - 1 )) + (align))
 
 extern uint32_t boot_page_directory[1024] ; // points to the wrong location
@@ -14,7 +16,7 @@ void flush_cr3(){
 
 void AllocatePage(uint32_t vaddr)
 {
-    uint32_t page_aligned_address = ALIGN(vaddr, 4096);
+    //uint32_t page_aligned_address = ALIGN(vaddr, 4096);
 
     // allocate a page at  virtual address
     int PageDirectoryEntryIndex = vaddr >> 22;
@@ -54,16 +56,16 @@ void AllocatePage(uint32_t vaddr)
 
 void FreePage(uint32_t vaddr )
 {
-    uint32_t page_aligned_address = ALIGN(vaddr, 4096);
+    // uint32_t page_aligned_address = ALIGN(vaddr, 4096);
 
     // allocate a page at  virtual address
     int PageDirectoryEntryIndex = vaddr >> 22;
     int PageTableEntryIndex = (vaddr >> 12) & 0x1FFF;
 
-    uint32_t* pageTable = (uint32_t*)(boot_page_directory[PageDirectoryEntryIndex] & 0xFFFFE000 + 0xC0000000);
+    uint32_t* pageTable = (uint32_t*)(boot_page_directory[PageDirectoryEntryIndex] & (0xFFFFE000 + 0xC0000000));
 
 
-    void* physicalAddressToFree = (void*)(pageTable[PageTableEntryIndex] & 0xFFFFE000 + 0xC0000000);
+    void* physicalAddressToFree = (void*)(pageTable[PageTableEntryIndex] & (0xFFFFE000 + 0xC0000000));
     free_block(physicalAddressToFree);
 
     pageTable[PageTableEntryIndex] = 0x0;
@@ -80,9 +82,9 @@ void Immediate_Map (  uint32_t vaddr, uint32_t paddr)
     int PageTableEntryIndex = (vaddr >> 12) & 0x1FFF;
 
     printf("Map address at PDE 0x%x PTE  0x%x\n", PageDirectoryEntryIndex, PageTableEntryIndex);
-
+    printf("boot pagedirectoy address: 0x%x\n", &boot_page_directory);
-     if ((boot_page_directory - 0xC0000000)[PageDirectoryEntryIndex] & 0x1 ) 
+    printf("PDE : 0x%x\n", boot_page_directory[PageTableEntryIndex]);
-    {
+     if (boot_page_directory[PageDirectoryEntryIndex] & 0x1 ) {
         printf("Directory entry is marked as present\n");
 
     } else {
@@ -90,37 +92,39 @@ void Immediate_Map (  uint32_t vaddr, uint32_t paddr)
         // mark the page table as present and allocate a physical block for it
 
         void* new_page_dir = allocate_block();
-        printf("New page directory address 0x%x\n", new_page_dir);
+         memset(new_page_dir, 0 , 1024 * sizeof (uint32_t));
+        printf("New page directory address 0x%x\n", &new_page_dir);
         boot_page_directory[PageDirectoryEntryIndex] = (uint32_t)new_page_dir | 0x3;
-        
     }
 
     printf("PDE found at : 0x%x\n", (uint32_t) &boot_page_directory[PageDirectoryEntryIndex]);
-        uint32_t* page_table = (uint32_t*)(boot_page_directory[PageDirectoryEntryIndex] & 0xFFFFE000) ;
+    uint32_t* page_table = (uint32_t*)(boot_page_directory[PageDirectoryEntryIndex] & 0xFFFFE000) ;
-        //page_table = (uint32_t*) ((uint32_t)page_table - 0xC0000000); // remove kernel offset
+    printf("Page table address: 0x%x\n", (uint32_t)page_table);
-        printf("Page table address: 0x%x\n", (uint32_t)page_table);
 
-          // check if the page table entry is marked as present 
+      // check if the page table entry is marked as present
-        if ( page_table[PageTableEntryIndex] & 0x1 )
+    if ( page_table[PageTableEntryIndex] & 0x1 )
-        {   
+    {
-            printf("page already present!\n");
+        printf("page already present!\n");
-            printf("Entry found at addr: 0x%x\n", &(page_table[PageTableEntryIndex]));
+        printf("Entry found at addr: 0x%x\n", &(page_table[PageTableEntryIndex]));
-        } else{
+    } else{
-            printf("Mapping a physical page.\n");
+        printf("Mapping a physical page.\n");
-            // Map the entry to a physical page
+        // Map the entry to a physical page
-            page_table[PageTableEntryIndex] = (uint32_t)(paddr | 0x3);
+        page_table[PageTableEntryIndex] = (uint32_t)(paddr | 0x3);
-        }
+    }
 
 
-    asm ("cli; invlpg (%0); sti" :: "r" (vaddr) : "memory" );
+    asm ("invlpg (%0)" :: "r" (vaddr) : "memory" );
 }
 
+
+// NOT IMPLEMENTED
 void Immediate_Unmap(uint32_t vaddr)
 {
     // NOTE: I will implement lazy unmapping for now 
-    uint32_t page_aligned_address = ALIGN(vaddr, 4096);
+    //uint32_t page_aligned_address = ALIGN(vaddr, 4096);
 
     // allocate a page at  virtual address
-    int PageDirectoryEntryIndex = vaddr >> 22;
+    //int PageDirectoryEntryIndex = vaddr >> 22;
-    int PageTableEntryIndex = (vaddr >> 12) & 0x1FFF;
+    //int PageTableEntryIndex = (vaddr >> 12) & 0x1FFF;
+
 }

kernel/prekernel/prekernel.cpp

@@ -2,6 +2,8 @@
 #include <stddef.h>
 #include "multiboot.h"
 #include "../memory/PhysicalMemoryManager.h"
+#include "../memory/VirtualMemoryManager.h"
+#include "../acpi/acpi.h"
 
 #define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
 #define VADDR_TO_PADDR(vaddr) (vaddr - 0xC0000000)
@@ -10,7 +12,6 @@ BootInfoBlock* BIB;
 
 extern "C" void prekernelSetup  ( unsigned long magic, multiboot_info_t* mbi) 
 {
-
         /*
         * Check Multiboot magic number
         */ 
@@ -21,18 +22,13 @@ extern "C" void prekernelSetup  ( unsigned long magic, multiboot_info_t* mbi)
         }
 
         mbi = PADDR_TO_VADDR(mbi);
-
-        // Setup the physical memory manager immmediatly 
-        // Doing so saves the complications of doing it later when 
-        // paging is enabled 
-
         /*
         If we got a memory map from our bootloader we 
         should be parsing it to find out the memory regions available.
         */
         if (CHECK_FLAG(mbi->flags, 6))
-        {  
+        {
-               
+
                 // Calculate total memory size 
                 uint32_t RAM_size = 0;
                 for(
@@ -56,6 +52,8 @@ extern "C" void prekernelSetup  ( unsigned long magic, multiboot_info_t* mbi)
                                 deallocate_region(mmap->addr, mmap->len);
                         if(mmap->type == MULTIBOOT_MEMORY_ACPI_RECLAIMABLE)
                                 allocate_region(mmap->addr, mmap->len);
+                                // memory map
+                                Immediate_Map(mmap->addr , mmap->addr);
                         if(mmap->type == MULTIBOOT_MEMORY_RESERVED)
                                 allocate_region(mmap->addr, mmap->len);
                         if(mmap->type == MULTIBOOT_MEMORY_NVS)
@@ -99,8 +97,6 @@ extern "C" void prekernelSetup  ( unsigned long magic, multiboot_info_t* mbi)
                 uint32_t i;
 
                 BIB->GrubModuleCount = mbi->mods_count;
-
-
                 for(i = 0, mod = (multiboot_module_t *) mbi->mods_addr; i < mbi->mods_count; i++ , mod++){
                         
                 }
@@ -135,6 +131,6 @@ extern "C" void prekernelSetup  ( unsigned long magic, multiboot_info_t* mbi)
 
                    // NOTE: Do something with it.. (Store it , process it etc...)
         } else{
-                BIB->EnabledVBE;
+                BIB->EnabledVBE  = false;
         }
 }

kernel/storage/filesystems/FAT/FAT.cpp

@@ -107,10 +107,10 @@ DirectoryNode* FAT::Lookup (inode* currentDir , DirectoryNode*  dir)
     for(int i = 0; i < sizeof(data) / sizeof (DIR); i++)
     {
         DIR* entry = (DIR*)((uint32_t)directory + (i * sizeof(DIR)));
+
+
         if(
             entry->Name[0] == FAT::FREE_DIR ||
-            entry->Name[0] == FAT::FREE_DIR_2 ||
-            entry->Name[0] == 0xE5 ||
             entry->ATTR & FAT::ATTRIBUTES::ATTR_VOLUME_ID ||
             entry->ATTR & FAT::ATTRIBUTES::ATTR_SYSTEM ||
             entry->ATTR & FAT::ATTRIBUTES::ATTR_HIDDEN
@@ -118,6 +118,20 @@ DirectoryNode* FAT::Lookup (inode* currentDir , DirectoryNode*  dir)
             continue;
         }
 
+
+        if( entry->ATTR & FAT::ATTRIBUTES::ATTR_DIRECTORY){
+            printf("entry in directory\n");
+            for(int i = 0; i < 11 ;i ++)
+                kterm_put(entry->Name[i]);
+            kterm_put('\n');
+        }
+
+
+
+
+        if( entry->Name[0] == FAT::FREE_DIR_2 )
+            break;
+
         auto* dirNode = (DirectoryNode*) malloc(sizeof (DirectoryNode));
 
         char* name = (char*)malloc(sizeof(char[11]));

kernel/storage/partitiontables/mbr/MasterBootRecord.h

@@ -22,22 +22,22 @@ inline MBR* GetPartitions(bool DEBUG = false){
     int S =1;
     uint32_t LBA = (C*HPC+H) * SPT + (S-1);
 
-    MBR* mbr =(MBR*) malloc(sizeof (MBR));
+    uint16_t* mbr =(uint16_t*) malloc(sizeof (MBR));
 
-    ATAPIO::Read(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER, LBA, (uint16_t*)mbr);
+    ATAPIO::Read(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER, LBA,  mbr );
+    auto bootRecord = (MBR*)(mbr);
 
-
+    printf("MBR (In Memory) Address 0x%x, Size = %d\n", bootRecord, sizeof (MBR));
-    printf("MBR (In Memory) Address 0x%x, Size = %d\n", mbr, sizeof (MBR));
     if(DEBUG){
-        printf("BootSector: 0x%x\n", mbr->ValidBootsector );
+        printf("BootSector: 0x%x\n", bootRecord->ValidBootsector );
         for( int i = 0 ; i < 4 ; i ++){
-            PartitionTableEntry PT = mbr->TableEntries[i];
+            PartitionTableEntry PT = bootRecord->TableEntries[i];
 
             printf("Partition %d [  %d sectors,  PartitionType: 0x%x, 0x%x, \nLBA Start: 0x%x ]\n" ,
-                   i, PT.Number_sectors_inPartition, PT.PartitionType, mbr->uniqueID,  PT.LBA_partition_start );
+                   i, PT.Number_sectors_inPartition, PT.PartitionType, bootRecord->uniqueID,  PT.LBA_partition_start );
         }
 
     }
 
-    return mbr;
+    return bootRecord;
 }

kernel/storage/vfs/vfs.cpp

@@ -80,20 +80,37 @@ FILE* VirtualFileSystem::open(const char* pathname, int flags){
     }
 
     // let's just loop through the folder first
+    printf("looking for: ");
+    for(int i = 0; i < 5; i++)
+        kterm_put(nextdir[i]);
+    kterm_put('\n');
     auto* child = rootentry->children;
     while(child->next != nullptr){
-
         auto* directory = (DirectoryNode*)child->data;
+
+        for(int i = 0; i < 11 ; i++)
+            kterm_put(directory->name[i]);
+        kterm_put('\n');
+
         if( directory->compare(directory, directory->name, nextdir) == 0){
             nextdir = strtok(nullptr, "/", &tokstate);
+            printf("Found dir!\n");
             if(nextdir == NULL){
                 file->root = directory->node;
                 file->flags =0;
                 file->read = FAT::Read;
                 return file;
             }
+            printf("continue searching next directory!\n");
+            if(directory->children == nullptr)
+                directory->node->lookup(directory->node, directory);
+
+
+            child = directory->children;
+
+        }else{
+            child = child->next;
         }
-        child = child->next;
     }
 
 

kernel/supervisorterminal/superVisorTerminal.cpp

@@ -6,6 +6,8 @@
 bool isRunning = true;
 extern "C" void startSuperVisorTerminal()
 {
+
+
     /*
     * Show a little banner for cuteness
     */
@@ -62,7 +64,8 @@ extern "C" void startSuperVisorTerminal()
             {
                 // Show version information 
                 printf("========= Version ========\n");
-                printf("Kernel v%d\n", 0);
+
+                asm volatile ("movl $0x666, %eax; int $0x50");
 
             }
             if(strncmp("CLEAR", command, characterCount) == 0)

kernel/syscalls.h

@@ -0,0 +1,52 @@
+//
+// Created by nigel on 26/02/23.
+//
+#pragma once
+
+
+#include "terminal/kterm.h"
+#include "storage/vfs/vfs_types.h"
+
+
+void sys_version (){
+    printf("KERNEL VERSION v0.4\n");
+}
+
+void sys_open(){
+
+}
+
+void sys_read(FILE* file, char* data){
+    file->read(file, data, 512);
+}
+
+void sys_write(FILE* path, const char* data, size_t size){
+
+}
+
+// NOTE: this should become our standard!
+void syscall_handler(int syscall_no ,  uint32_t* args... ){
+    switch(syscall_no){
+        case 0x0:
+            printf("test!\n");
+            break;
+        case 0x5:
+            // SYS_OPEN
+            // sys_open();
+            break;
+        case 0x10:
+            // SYS_READ
+            // sys_read((FILE*)args[1], (char*) args[2] );
+            break;
+        case 0x20:
+            // SYS_WRITE
+            //sys_write((FILE*)args[1], (const char*) args[2], (size_t)args[3]);
+            break;
+        case 0x666:
+            // SYS_VERSION
+            sys_version();
+            break;
+    }
+}
+
+

kernel/terminal/kterm.cpp

@@ -21,7 +21,14 @@ void kterm_init () {
     kterm_row = 0;
     kterm_column = 0;
     kterm_color = vga_entry_color ( VGA_COLOR_LIGHT_GREY , VGA_COLOR_BLACK);
-    kterm_buffer = (uint16_t*) 0xC03FF000;
+
+    //Physical address
+    // 0xB8000
+    // Virtual address
+    // 0xC03FF000
+
+    //kterm_buffer = ((uint16_t*) 0xB8000);
+    kterm_buffer = ((uint16_t*)  0xC03FF000 );
     
     for (size_t y = 0; y < VGA_HEIGHT; y++ ){
         for( size_t x = 0; x < VGA_WIDTH; x++){
@@ -59,7 +66,6 @@ void disable_cursor()
         outb(0x3D5, 0x20);
 }
 
-
 void update_cursor(int x, int y){
     uint16_t pos = y * VGA_WIDTH + x;
 
@@ -86,8 +92,6 @@ int get_cursor_y (uint16_t cursor_pos ) {
     return cursor_pos / VGA_WIDTH;
 }
 
-
-
 /**
  *  With the help from:
  * https://whiteheadsoftware.dev/operating-systems-development-for-dummies/
@@ -134,7 +138,6 @@ void kterm_writestring(const char* data ){
     kterm_write(data, strlen(data));
 }
 
-
 static void itoa (char *buf, int base, int d) {
     char *p = buf;
     char *p1, *p2;
@@ -173,28 +176,28 @@ static void itoa (char *buf, int base, int d) {
 
 void printf ( const char *format, ...) {
     
-    char **arg = (char **)&format;
+    auto **arg = (unsigned char **)&format;
     int c;
     char buf[20];
 
     arg++;
     
-    while ((c = *format++) != 0){
+    while ((c = *(const unsigned char*)format++) != 0){
         if( c != '%')
             kterm_put(c);
         else{
-            char *p, *p2;
+            char const *p, *p2;
             int pad0 = 0, pad = 0;
 
-            c = *format++;
+            c = *(const unsigned char*)format++;
             if(c =='0'){
                 pad0 = 1;
-                c = *format++;
+                c = *(const unsigned char*)format++;
             }
 
             if ( c >= '0' && c <= '9'){
                 pad = c - '0';
-                c = *format++;
+                c = *(const unsigned char*)format++;
             }
 
             switch (c)
@@ -210,7 +213,7 @@ void printf ( const char *format, ...) {
                 break;
             
             case 's':
-                p = *arg++;
+                p = (char const *)*arg++;
                 if(!p)
                     p = "(null)";
                 
@@ -224,7 +227,7 @@ void printf ( const char *format, ...) {
 
 
             default:
-                kterm_put(*((int *)arg++));
+                kterm_put(*(int *) arg++); // NOLINT(cppcoreguidelines-narrowing-conversions)
                 break;
             }
         }

run.sh

@@ -3,23 +3,25 @@ PROC=$$
 
 # Build the Corelib static library
 (cd CoreLib
-if ! make; then
+if ! make 2> warnings.log 1> /dev/null ; then
-    echo "Build failed!"
+    echo "Build Corelib failed!"
     kill -10 $PROC
 fi)
 
 # Build the kernel image
 (cd kernel
-make clean
+# make clean
-make
+if ! make 2> warnings.log 1> /dev/null ; then
-if ! make; then
+  echo "Build kernel failed!"
-  echo "Build failed!"
   kill -10 $PROC
 fi)
 
 ./scripts/update_harddrive.sh
+./scripts/create_symbol_lookup.sh
 
-
+args="";
-
+if [[ $1 == "-d" ]]
-./scripts/run_qemu.sh
+then
-
+  args="debug"
+fi
+./scripts/run_qemu.sh $args

scripts/create_symbol_lookup.sh

@@ -1,3 +1,4 @@
 #!/bin/bash
-
+echo "creating symbols file"
-objcopy --only-keep-debug build/kernel/myos.bin kernel.sym
+echo $(pwd)
+objcopy --only-keep-debug root/boot/myos.bin kernel.sym

scripts/run_qemu.sh

@@ -1,7 +1,13 @@
 #!/bin/bash
 
+if [[ $1 == "debug" ]]
+then
+  qemu-system-i386 -s -boot d -drive format=raw,file=disk.img -serial stdio -vga std -display gtk -m 2G -cpu core2duo -d int -no-shutdown -no-reboot
+else
+  qemu-system-i386 -s -boot d -drive format=raw,file=disk.img -serial stdio -vga std -display gtk -m 2G -cpu core2duo
+fi
 # Run from harddisk
-qemu-system-i386 -boot d -drive format=raw,file=disk.img -serial stdio -vga std -display gtk -m 2G -cpu core2duo
+#qemu-system-i386 -boot d -drive format=raw,file=disk.img -serial stdio -vga std -display gtk -m 2G -cpu core2duo -d int -no-shutdown -no-reboot
 
 # Run disk version
 # qemu-system-i386 -cdrom barinkOS.iso -serial stdio -vga std -display gtk -m 2G -cpu core2duo -s -d int -no-shutdown -no-reboot