d2f7cbe7b2
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> |
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| .. | ||
| 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 | ||