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| author | Richard Qin <richard.qin.x@gmail.com> | 2026-11-08 07:00:43 +0800 |
|---|---|---|
| committer | Richard Qin <richard.qin.x@gmail.com> | 2026-11-08 07:00:43 +0800 |
| commit | 4259f8453d6069d5d3c7651b7cf9aae0f4c148ea (patch) | |
| tree | 79eb6d10cff8558ee3ac7a836a7dfc6037ab068f /mubios/arch | |
| parent | a460aa2fd50ba86f39e7d23ff3019aedd2b8600e (diff) | |
| download | rcc-project-4259f8453d6069d5d3c7651b7cf9aae0f4c148ea.tar.gz rcc-project-4259f8453d6069d5d3c7651b7cf9aae0f4c148ea.tar.xz | |
[mubios] Implement INT 13h AH=41h
Signed-off-by: Richard Qin <richard.qin.x@gmail.com>
Diffstat (limited to 'mubios/arch')
| -rw-r--r-- | mubios/arch/interrupt.S | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/mubios/arch/interrupt.S b/mubios/arch/interrupt.S index 6dc05c8..ab068c1 100644 --- a/mubios/arch/interrupt.S +++ b/mubios/arch/interrupt.S @@ -140,3 +140,39 @@ int10_save_cursor: int10_return: iret + + .global int13_entry + .type int13_entry, @function + +int13_entry: + int13_entry: + cmp ah, 0x41 + jne int13_return + + push bp + mov bp, sp + + cmp bx, 0x55AA + jne int13_fail + + mov bx, 0xAA55 + mov cx, 0x0001 + mov ax, 0x3000 + + # Clear CF in the FLAGS saved by INT. + and word ptr [bp + 6], 0xFFFE + + pop bp + iret + +int13_fail: + mov ah, 0x01 + + # Set CF in the FLAGS saved by INT. + or word ptr [bp + 6], 0x0001 + + pop bp + iret + +int13_return: + iret |