a6be271e63
Currently there are 3 GDTs (Global Descriptor Tables) being used on x86: - preRAM (gdt_init.S) - SMM (smm_stub.S) - RAM (c_start.S) They have different layouts and thus different offsets for the segments being used in assembly code. Stop using different GDT segments and ensure that for ROM (preRAM + SMM) and RAM (ramstage) the segments match. RAM will have additional entries, not found in pre RAM GDT, but the segments for protected mode and 64-bit mode now match in all stages. This allows to use the same defines in all stages. It also drops the need to know in which stage the code is compiled and it's no longer necessary to switch the code segment between stages. While at it fix the comments in the ramstage GDT and drop unused declarations from header files, always set the accessed bit and drop GDT_CODE_ACPI_SEG. Change-Id: I208496e6e4cc82833636f4f42503b44b0d702b9e Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/87255 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Shuo Liu <shuo.liu@intel.com> Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com> |
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