How do I change my Windows XP x64 Pro to use AHCI Mode instead of IDE so I can dual boot with Windows 8?

I have a dual booting system set up in which there are two operating systems on two different drives.

1. Disk 1 (HDD) - Windows XP x64 Professional (Uses IDE)
2. Disk 2 (SSD) - Windows 8 x64 Professional (Uses AHCI)

Now I can use Windows 8 if I change my BIOS to AHCI and not Windows XP. While I can use Windows XP if I change to IDE. How can I set up either of the OS so I can use whichever I want without having to change BIOS Settings again and again?