X86: Move the GDT down to where it can be accessed in 32 bit mode.

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Submitter:	Gabe Black
Repository:	gem5
Branch:	default
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Description

Changeset 9029:9fbe1b15283b
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X86: Move the GDT down to where it can be accessed in 32 bit mode.

The GDT can be accessed by user level software running in compatibility mode
by moving segment selectors into segment registers. The GDT needs to be set up
at an address accessible in this mode.

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Seems fine to me. Just for my information, why do we not set GDT for 64 bit processes?

Gabe Black May 27, 2012, 11:59 a.m. (May 27, 2012, 11:59 a.m.)

It's historical. 32 bit processes actually do things with segments like thread local storage, so when I was getting those going they needed the gdt. It's never been necessary to set it up for 64 bit processes.

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Status: Closed (submitted)