diff options
| -rw-r--r-- | src/entry.asm | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/entry.asm b/src/entry.asm index 4e43916..7f5ed5b 100644 --- a/src/entry.asm +++ b/src/entry.asm @@ -120,6 +120,7 @@ stage_two_msg db "Stage2 loaded", NEWLINE, RETURN, NULL disk_success_msg db "Disk is valid", NEWLINE, RETURN, NULL inode_table_msg db "Found inode table", NEWLINE, RETURN, NULL kernel_found_msg db "Found kernel file", NEWLINE, RETURN, NULL +protected_msg db "Jumping to protected mode", NEWLINE, RETURN, NULL drive db 0 ; Filenames @@ -200,7 +201,25 @@ stage_two: mov si, kernel_found_msg call print ; Show happy message! + ; Load kernel + mov ax, [bx + EXT2_INODE_OFFSET] ; Get inode number + dec ax ; Decrement inode: (inode - 1) + mov cx, EXT2_INODE_SIZE ; Prepare for mul + mul cx ; Multiply inode number (* EXT2_INODE_SIZE) + mov bx, ax ; Move for effective address calculations + mov bx, [bx + EXT2_INODE_TABLE_LOC] ; bx is at the start of the inode + mov ax, [bx + EXT2_TYPE_OFFSET] ; Get filetype + and ax, EXT2_REG ; AND with regular file + cmp ax, EXT2_REG ; Check if it's a regular file + jne disk_error ; Not a regular file! jmp $ + ; Read first block + mov ax, [bx + EXT2_POINTER_OFFSET] ; Address of first block pointer + shl ax, 1 ; Multiply by 2 + mov [lba], ax + mov bx, 0x5000 + mov [dest], bx + call disk_read ; TODO: TEST! mov bx, 0x5000 mov [dest + 2], bx @@ -232,6 +251,8 @@ kernel_load: protected_mode_enter: cli ; Turn off interrupts + mov si, protected_msg + call print ; TODO: Check A20 support? ; TODO: 0x92 method may not work on every device |