init

asm/Makefile

+build:
+	nasm -f bin boot.asm -o boot.img
+
+run: build
+	qemu-system-x86_64 boot.img
+

asm/x16.asm → asm/boot.asm

 [bits 16]
 [org 0x7c00]
 
-jmp _enter_prot_mode
+jmp _init_prot_mode
 
 gdt_begin:
 
@@ -36,7 +36,7 @@ gdt_desc:
 CODE_SEG_OFFSET equ gdt_entry_1 - gdt_begin
 DATA_SEG_OFFSET equ gdt_entry_2 - gdt_begin
 
-_enter_prot_mode:
+_init_prot_mode:
     cli
     lgdt [gdt_desc]
     mov eax, cr0
@@ -46,6 +46,7 @@ _enter_prot_mode:
     jmp CODE_SEG_OFFSET:_prot_begin
 
 [bits 32]
+%include "./str.32.inc"
 _prot_begin:
     mov ax, DATA_SEG_OFFSET
     mov ds, ax
@@ -56,8 +57,20 @@ _prot_begin:
 
     mov ebp, 0x90000 ; 600KB free space here, until 0x7c00 + 0x200 byte (MBR sector 0)
     mov esp, ebp
+    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 32BIT PROTECTED MODE BEGIN ;;;;;;;;;;;;;;;;;;;;;;;;;;
 
+_dead_loop:
+    mov ebx, _motd_32
+    call println_vga
+    mov ebx, _motd_32p
+    call println_vga
+    jmp _dead_loop
+
+_motd_32:
+    db '----- CPU is in INTEL x86 protected mode now -----', 0x0
+_motd_32p:
+    db '+++++ CPU is in INTEL x86 protected mode now +++++', 0x0
     
-    
+%include "./mbr_end.inc"    
 
 

asm/mbr_end.inc

+times 510-($-$$) db 0
+dw 0xaa55

asm/str.16.inc

+
+println_bios:
+    ; Arg0: addr in register bx
+    ; while true:
+    ;     if [bx] != NULL:
+    ;         print [bx]; ++bx
+    mov ah, 0x0e
+_loop_begin:
+    mov al, [bx]
+    cmp al, 0x0
+    je _loop_exit
+    int 0x10
+    inc bx
+    jmp _loop_begin
+_loop_exit:
+    ret
+

asm/str.32.inc

+
+VGA_BEGIN_ADDR equ 0xb8000
+println_vga:
+    ; Arg0: addr in register ebx
+    pusha
+    mov edx, VGA_BEGIN_ADDR
+    mov ah, 0x0f
+_loop_begin_1:
+    mov al, [ebx]
+    cmp al, 0x0
+    je _loop_exit_1
+    mov [edx], ax
+    inc ebx
+    add edx, 2
+    jmp _loop_begin_1
+_loop_exit_1:
+    popa
+    ret
+
+

asm/test.asm

@@ -3,8 +3,9 @@
 ;
 [org 0x7c00]
 
-mov bx, str
-call println_bios
+mov ebx, str
+call println_vga
+jmp $
 
 println_bios:
     ; Arg0: addr in register bx
@@ -22,13 +23,29 @@ _loop_begin:
 _loop_exit:
     ret
     
+; [bits 32]
+VGA_BEGIN_ADDR equ 0xb8000
 println_vga:
-    ; Arg0: addr in register eax
+    ; Arg0: addr in register ebx
+    pusha
+    mov edx, VGA_BEGIN_ADDR
+    mov ah, 0x0f
+_loop_begin_1:
+    mov al, [ebx]
+    cmp al, 0x0
+    je _loop_exit_1
+    mov [edx], ax
+    inc ebx
+    add edx, 2
+    jmp _loop_begin_1
+_loop_exit_1:
+    popa
+    ret
+    
 
 str:
     db 'This is Recolic!', 0x0
 
-jmp $
 times 510-($-$$) db 0
 dw 0xaa55
 

boot.backup.c

-
-asm ("jmp 0x14");
-
-//void print_char(char to_print) {
-//    asm inline (
-//            "mov $0x0e, %%ah\n\t"
-//            "mov %0, %%al\n\t"
-//            "int $0x10"
-//            : 
-//            : "Ir" (to_print)
-//            : "ax"
-//            );
-//}
-//
-//void println(char *s) {
-//    while(*s != 0) {
-//        print_char(*s);
-//    }
-//}
-    
-
-
-void main() {
-_start_p:
-    asm (
-            "mov $0x0e, %ah\n\t"
-            "mov $0x55, %al\n\t"
-            "int $0x10"
-            );
-    //print_char('X');
-    //println("Hello world!");
-    //println("Recolic Booting OS HERE...");
-}
-
-asm (
-"jmp 0x-2\n\t"
-);
-
-