diff options
Diffstat (limited to 'src/stage2_functions.asm')
| -rw-r--r-- | src/stage2_functions.asm | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/src/stage2_functions.asm b/src/stage2_functions.asm index 018cf6a..d692ed2 100644 --- a/src/stage2_functions.asm +++ b/src/stage2_functions.asm @@ -55,6 +55,34 @@ pm_print_char: call inc_cursor ret +; IN dx: hex value to print +pm_print_hex: + push bx + push si + mov si, HEX_TEMPLATE + mov bx, dx + shr bx, 12 + mov bx, [HEXABET+bx] + mov [HEX_TEMPLATE+2], bl + mov bx, dx + and bx, 0x0FFF + shr bx, 8 + mov bx, [HEXABET+bx] + mov [HEX_TEMPLATE+3], bl + mov bx, dx + and bx, 0x00FF + shr bx, 4 + mov bx, [HEXABET+bx] + mov [HEX_TEMPLATE+4], bl + mov bx, dx + and bx, 0x000F + mov bx, [HEXABET+bx] + mov [HEX_TEMPLATE+5], bl + call pm_print_string + pop si + pop bx + ret + inc_cursor: push eax mov ax, [CURSOR_X] @@ -106,3 +134,26 @@ update_vga_cursor: pop ecx pop ebx ret + +check_magic: + push eax + push ebx + push ecx + push edx + push esi + mov eax, NOF_LOAD_SECTORS ; number of 512-byte sectors + shl eax, 9 ; 512 bytes per sector + mov ecx, 0x7e00 ; offset of stage 2 + add ecx, eax + sub ecx, 11 ; the length of the magic string + mov dx, cx + call pm_print_hex + mov dx, [ecx] + call pm_print_hex + call pm_print_newline + pop esi + pop edx + pop ecx + pop ebx + pop eax + ret |