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bootloader/bootloader.asm

@@ -0,0 +1,15 @@
+org 0x7c00
+
+
+mov [BOOT_DISK], dl
+mov bp, 0x7c00
+mov sp, bp
+call boot
+
+
+
+
+%include "bootloader/disk.asm"
+
+times (510-($-$$)) db 0
+dw 0xaa55    

bootloader/disk.asm

@@ -0,0 +1,16 @@
+PROGRAM_SPACE equ 0x7e00 
+
+boot:
+    mov ah, 0x02
+    mov dl, [BOOT_DISK]
+    mov bx, PROGRAM_SPACE
+    mov al, 32
+    mov ch, 0x00
+    mov dh, 0x00
+    mov cl, 0x02
+    int 0x13
+    jmp PROGRAM_SPACE
+    
+
+BOOT_DISK: 
+    db 0

bootloader/print.asm

@@ -0,0 +1,24 @@
+[bits 16]
+ClearScreen:
+    mov ah, 00h
+    mov al, 03h
+    int 10h
+
+PrintString:
+    push ax
+    push bx
+
+    mov ah, 0x0e
+    .Loop:
+    cmp [bx], byte 0
+    je .Exit
+        mov al, [bx]
+        int 0x10
+        inc bx
+        jmp .Loop
+    .Exit:
+    pop ax
+    pop bx
+    ret
+    
+    

compile.bat

@@ -0,0 +1,13 @@
+nasm bootloader/bootloader.asm -f bin -o bootloader.bin
+nasm kernel/kernel.asm -f elf64 -o init.o
+wsl $WSLENV/x86_64-elf-gcc -ffreestanding -mno-red-zone -m64 -c "./kernel/kmain.cpp" -o "kernel.o"
+wsl $WSLENV/x86_64-elf-ld -o kernel.tmp -Ttext 0x7e00  init.o kernel.o
+wsl /usr/bin/objcopy -O binary kernel.tmp kernel.bin
+copy /b bootloader.bin+kernel.bin armenianOS-x86_64.flp
+move armenianOS-x86_64.flp ./build/x86_64/
+del kernel.bin
+del bootloader.bin
+del kernel.o 
+del init.o 
+del kernel.tmp
+qemu-system-x86_64.exe build/x86_64/armenianOS-x86_64.flp

kernel/cpuid.asm

@@ -0,0 +1,30 @@
+_detectCpuId:
+    pushfd
+    pop eax
+
+    mov ecx,eax
+
+    xor eax, 1 << 21
+    push eax
+    popfd 
+    pushfd 
+    pop eax
+    push ecx
+    popfd
+    xor eax,ecx
+    jz NoCPUID
+    ret
+
+_detectLongMode:
+    mov eax,0x80000001
+    cpuid 
+    test edx, 1 << 29
+    jz NoLongMode
+    ret
+
+NoLongMode:
+    hlt
+
+NoCPUID:
+    hlt
+

kernel/gdt.asm

@@ -0,0 +1,34 @@
+gdt_nulldesc:
+    dd 0
+    dd 0
+
+gdt_codedesc:
+    dw 0xFFFF
+    dw 0x0000
+    db 0x00
+    db 10011010b
+    db 11001111b
+    db 0x00
+gdt_datasec:
+    dw 0xFFFF
+    dw 0x0000
+    db 0x00
+    db 10010010b
+    db 11001111b
+    db 0x00
+
+gdt_end:
+
+gdt_descriptor:
+    gdt_size:
+        dw gdt_end - gdt_nulldesc - 1
+        dd gdt_nulldesc
+
+codeseg equ gdt_codedesc - gdt_nulldesc
+dataseg equ gdt_datasec - gdt_nulldesc
+
+[bits 32]
+EditGDT:
+    mov [gdt_codedesc+6], byte 11001111b
+    mov [gdt_datasec+6], byte 10101111b
+    ret

kernel/kernel.asm

@@ -0,0 +1,51 @@
+[bits 16]
+[extern _kmain]
+_enterpm:
+    call ClearScreen
+    call EnableA20
+    cli
+    lgdt [gdt_descriptor]
+    mov eax, cr0
+    or eax, 1
+    mov cr0, eax
+    jmp codeseg:_startpmode
+
+EnableA20:
+    in al, 0x92
+    or al, 2
+    out 0x92,  al
+    ret
+    
+
+%include "bootloader/print.asm"
+%include "kernel/gdt.asm"
+%include "kernel/cpuid.asm"
+%include "kernel/paging.asm"
+
+
+
+[bits 32]
+_startpmode:
+    mov ax, dataseg
+    mov ds,ax
+    mov ss,ax
+    mov es,ax
+    mov fs,ax
+    mov gs,ax
+    call _kmain
+    call _detectCpuId
+    call _detectLongMode
+    call _setuppaging
+    call EditGDT
+    jmp codeseg:Start64Bit
+
+    
+[bits 64]
+Start64Bit:
+    call _kmain
+
+
+
+
+
+times (2048-($-$$)) db 0

kernel/kmain.cpp

@@ -0,0 +1,10 @@
+
+
+extern "C" int _kmain(){
+    *(char*)0xB8000 = 'H';
+    *(char*)0xB8002 = 'e';
+    *(char*)0xB8004 = 'l';
+    *(char*)0xB8006 = 'l';
+    *(char*)0xB8008 = 'o';
+    while(true);
+}

kernel/paging.asm

@@ -0,0 +1,32 @@
+PageTableEntry equ 0x1000
+
+_setuppaging:
+    mov edi, PageTableEntry
+    mov cr3, edi
+    mov dword [edi], 0x2003
+    add edi, 0x1000
+    mov dword [edi], 0x3003
+    add edi, 0x4003
+    mov ebx, 0x00000003
+    mov ecx, 512
+
+    .SetEntry:
+        mov dword [edi], ebx
+        add ebx, 0x1000
+        add edi, 8
+        loop .SetEntry
+    
+    mov eax, cr4
+    or eax, 1 << 5
+    mov cr4, eax
+
+
+    mov ecx, 0xC00000000
+    rdmsr
+    or eax, 1 << 8
+    wrmsr
+
+    mov eax, cr0
+    or eax, 1 << 31
+    mov cr0, eax
+    ret