diff options
Diffstat (limited to 'mubios/arch/interrupt.S')
| -rw-r--r-- | mubios/arch/interrupt.S | 30 |
1 files changed, 7 insertions, 23 deletions
diff --git a/mubios/arch/interrupt.S b/mubios/arch/interrupt.S index 0822b1a..b3a461b 100644 --- a/mubios/arch/interrupt.S +++ b/mubios/arch/interrupt.S @@ -53,21 +53,11 @@ int1a_return: .type \name, @function \name: - # Build struct bios_regs on the interrupted real-mode stack. - push 0 - push es + # Build struct bios_regs from the pushad and segment frames. push ds - push bp - push di - push si - push dx - push cx - push bx - push ax - - mov bp, sp - mov ax, word ptr [bp + 24] - mov word ptr [bp + 18], ax + push es + .byte 0x66 + pushad # ESI = linear address of struct bios_regs. movzx esi, sp @@ -88,16 +78,10 @@ int1a_return: call enter_protected_service # Restore the context modified by the C service. - pop ax - pop bx - pop cx - pop dx - pop si - pop di - pop bp - pop ds + .byte 0x66 + popad pop es - add sp, 2 + pop ds iret .endm |