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author | Borislav Petkov <bp@suse.de> | 2013-10-31 17:25:08 +0100 |
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committer | Matt Fleming <matt.fleming@intel.com> | 2013-11-02 11:09:36 +0000 |
commit | d2f7cbe7b26a74dbbbf8f325b2a6fd01bc34032c (patch) | |
tree | 69d2c1f92120fa532c77cf8634418b7622d55692 /arch/x86/platform/efi/efi_32.c | |
parent | 82f0712ca0f947170e785300b5c39d9c25e2f6ff (diff) | |
download | op-kernel-dev-d2f7cbe7b26a74dbbbf8f325b2a6fd01bc34032c.zip op-kernel-dev-d2f7cbe7b26a74dbbbf8f325b2a6fd01bc34032c.tar.gz |
x86/efi: Runtime services virtual mapping
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>
Diffstat (limited to 'arch/x86/platform/efi/efi_32.c')
-rw-r--r-- | arch/x86/platform/efi/efi_32.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c index 40e4469..e94557c 100644 --- a/arch/x86/platform/efi/efi_32.c +++ b/arch/x86/platform/efi/efi_32.c @@ -37,9 +37,16 @@ * claim EFI runtime service handler exclusively and to duplicate a memory in * low memory space say 0 - 3G. */ - static unsigned long efi_rt_eflags; +void efi_sync_low_kernel_mappings(void) {} +void efi_setup_page_tables(void) {} + +void __init efi_map_region(efi_memory_desc_t *md) +{ + old_map_region(md); +} + void efi_call_phys_prelog(void) { struct desc_ptr gdt_descr; |