Power Off Question
 

I'm curious if anyone can refer me to a URL or explain how exactly it is that I can achieve a soft power down in assembly code. Like is there a certain interrupt I should call? Some special value I need to place into memory? A particular opcode? Any help is appreciated.

i just did a google search "assembly reboot code"

http://www.faqs.org/faqs/assembly-la...section-5.html

hope that helps

I'm thinking that's not at all what he wants. I would suggest beginning with something like ACPI. Note that not all machines are equipped with this ability. If you're dealing with some relatively common machine, a peep at the BIOS should tell you if APM is available. For something like a desktop PC, you're getting into the driver area, which suggests that you can't just pop some inline assembly into your app.

Ya you're on the money DaWei, but thanks for the help mrynit I actually found those tutorials myself and wrote a brief reboot program. I'm not trying to pop some inline assembly into my prog. I was actually hoping to write a small boot loader like the Hello World! example I posted here in the assembly forum, but that once it's done, rather than keeping the computer in a non-terminating loop it waits for a keyboard input and then powers down. Figuring out how to do it within Windows would likely be more complicated then I could understand. Thanks for that link though DaWei someone on the IRC chat had said something referring to ACPI in MenuetOS but I had no clue what they meant.

Found what I needed, it was the interrupt 0x15. Of course, proper coding as you pointed out DaWei would require that I perform a check that this interrupt is actually existent and functional. Anyhow, here's the FASM code for a power down.