FreeBSD's x86 reboot code

Date: 2011-06-27 12:58 pm (UTC)
From: (Anonymous)
FreeBSD does the following:

- ACPI reset
- Keyboard reset, then wait half a second to see if that worked.
- Two writes to the reset control register (0xcf9), first trying a "soft" reset, then trying a "hard" reset, and then wait half a second to see if that worked.
- Use the Fast A20 and Init register (0x92) if it exists and give it a half-second.
- Triple fault.
- Hang.

The ACPI bits are in the ACPI code, the rest is in cpu_reset_real() in sys/{amd64,i386}/{amd64,i386}/vm_machdep.c:

http://svnweb.freebsd.org/base/head/sys/amd64/amd64/vm_machdep.c?revision=222813&view=markup#l577
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Matthew Garrett

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Power management, mobile and firmware developer on Linux. Security developer at Nebula. Ex-biologist. @mjg59 on Twitter. Content here should not be interpreted as the opinion of my employer.

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