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x86: generate RAM-based GDT dynamically

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We will need this for stack memory protection scenarios
where a writable GDT with Task State Segment descriptors
will be used. The addresses of the TSS segments cannot be
put in the GDT via preprocessor magic due to architecture
requirments that the address be split up into different
fields in the segment descriptor.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2017-07-14 15:29:17 -07:00 • committed by Anas Nashif
commit 08c291306e
7 changed files with 160 additions and 42 deletions
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Makefile
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@ -898,6 +898,9 @@ include $(srctree)/arch/x86/Makefile.idt
ifeq ($(CONFIG_X86_MMU),y)
include $(srctree)/arch/x86/Makefile.mmu
endif
ifeq ($(CONFIG_GDT_DYNAMIC),y)
include $(srctree)/arch/x86/Makefile.gdt
endif
endif
ifeq ($(CONFIG_GEN_ISR_TABLES),y)