diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2023-08-07 18:27:13 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-08-07 20:52:32 +0200 |
| commit | cb1c9e02b0c13032c3aec325643453ba48e96e17 (patch) | |
| tree | eb340ba7015e5ebb407b456ba603965883a4244c /drivers/firmware/efi/libstub/efistub.h | |
| parent | 03dda95137d3247564854ad9032c0354273a159d (diff) | |
x86/efistub: Perform 4/5 level paging switch from the stub
In preparation for updating the EFI stub boot flow to avoid the bare
metal decompressor code altogether, implement the support code for
switching between 4 and 5 levels of paging before jumping to the kernel
proper.
Reuse the newly refactored trampoline that the bare metal decompressor
uses, but relies on EFI APIs to allocate 32-bit addressable memory and
remap it with the appropriate permissions. Given that the bare metal
decompressor will no longer call into the trampoline if the number of
paging levels is already set correctly, it is no longer needed to remove
NX restrictions from the memory range where this trampoline may end up.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Link: https://lore.kernel.org/r/20230807162720.545787-17-ardb@kernel.org
Diffstat (limited to 'drivers/firmware/efi/libstub/efistub.h')
| -rw-r--r-- | drivers/firmware/efi/libstub/efistub.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h index 6aa38a1bf126..06b7abc92ced 100644 --- a/drivers/firmware/efi/libstub/efistub.h +++ b/drivers/firmware/efi/libstub/efistub.h @@ -33,6 +33,7 @@ #define EFI_ALLOC_LIMIT ULONG_MAX #endif +extern bool efi_no5lvl; extern bool efi_nochunk; extern bool efi_nokaslr; extern int efi_loglevel; |