![]() We map the EFI regions needed for runtime services non-contiguously, with preserved alignment on virtual addresses starting from -4G down for a total max space of 64G. This way, we provide for stable runtime services addresses across kernels so that a kexec'd kernel can still use them. Thus, they're mapped in a separate pagetable so that we don't pollute the kernel namespace. Add an efi= kernel command line parameter for passing miscellaneous options and chicken bits from the command line. While at it, add a chicken bit called "efi=old_map" which can be used as a fallback to the old runtime services mapping method in case there's some b0rkage with a particular EFI implementation (haha, it is hard to hold up the sarcasm here...). Also, add the UEFI RT VA space to Documentation/x86/x86_64/mm.txt. Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Matt Fleming <matt.fleming@intel.com> |
||
---|---|---|
.. | ||
i386 | ||
x86_64 | ||
00-INDEX | ||
boot.txt | ||
early-microcode.txt | ||
earlyprintk.txt | ||
entry_64.txt | ||
exception-tables.txt | ||
mtrr.txt | ||
pat.txt | ||
usb-legacy-support.txt | ||
zero-page.txt |