Bootloader second stage

bare-bones-bootloader/bootloader.nasm

@@ -55,15 +55,19 @@ start:
     mov ax, 0x0 
     mov es, ax      ;Section to write into
     mov ah, 0x2     ;Read sectors from drive
-    mov al, 0x8    ;Number of sectors to read
+    mov al, 0x08    ;Number of sectors to read
     mov ch, 0x0    ;Low 8 bits of cylinder
-    mov cl, 0x2    ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
+    mov cl, 0x5    ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
     mov dh, 0x0    ;Head number
     mov dl, 0x0    ;Drive number
     mov bx, 0x7e00     ;Offset into section
     int 0x13         ;Low level disk services
     ;mov [0x7000], es ; saving retult of read
 ;   
+    mov si, 500
+    mov cx, 512   
+    call b_dumpmem
+
     jnc notcarry
     mov si, error_str
     call print
@@ -143,10 +147,29 @@ print:
 .done:
     ret
 
-
+b_dumpmem:
+    push ax
+    push dx
+    call printCRLF
+    shr cx, 1
+    xor dx, dx      ; zero dx
+.loop:
+    cmp dx, cx
+    jae .end
+    mov ax, word [esi + 2*edx]
+    call dumpax
+    mov ax, 0xe20
+    int 0x10
+    inc dx
+    jmp .loop
+.end:
+    pop dx
+    pop ax
+    ret
 ; Pad to 510 bytes (boot sector size minus 2) with 0s, and finish with the two-byte standard boot signature
 times 510-($-$$) db 0 
 dw 0xAA55           ; => 0x55 0xAA (little endian byte order)
+times 2048-($-$$) db 0
 
 %include "kernel.nasm"
 

bare-bones-bootloader/kernel.nasm

@@ -1,9 +1,15 @@
 BITS 16 
 ORG 0
 start_sing_os:
-    mov si, welcome ; Put address of the null-terminated string to output into 'si'
+    mov ax, welcome
+    sub ax, 1536
+    mov si, ax ; Put address of the null-terminated string to output into 'si'
     call print_os      ; Call our string-printing routine
-    mov si, command_line
+    
+    mov ax, command_line
+    sub ax, 1536
+    mov si, ax
+
     call print_os
     jmp terminal
 
@@ -105,7 +111,7 @@ wait_for_key_os:
         call stringcompare
         jne .not_dumpmem
         call printCRLF_os
-        lea si, [start_sing_os]
+        mov si, 0x7e0 ;[start_sing_os]
         mov cx, 512
         call dumpmem
     .not_dumpmem:
@@ -155,7 +161,9 @@ wait_for_key_os:
         int 0x10
 
     .no_str:
-        mov si, command_line
+        mov ax, command_line
+        sub ax, 1536
+        mov si, ax
         call print_os
         jmp .return_enter