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x86: gen_gdt: improve docstring

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Describe what info we're snarfing out of the prebuilt kernel.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
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Andrew Boie 2020-07-17 19:02:30 -07:00 committed by Anas Nashif
parent 38333afe0e
commit 98bcc51b09
1 changed files with 9 additions and 0 deletions
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arch/x86/gen_gdt.py
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@ -16,6 +16,15 @@ This kernel image has been properly padded such that inserting
these data structures will not disturb the memory addresses of
other symbols.
The input kernel ELF binary is used to obtain the following
information:
- Memory addresses of the Main and Double Fault TSS structures
so GDT descriptors can be created for them
- Memory addresses of where the GDT lives in memory, so that this
address can be populated in the GDT pseudo descriptor
- whether userspace or HW stack protection are enabled in Kconfig
The output is a GDT whose contents depend on the kernel
configuration. With no memory protection features enabled,
we generate flat 32-bit code and data segments. If hardware-