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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-01-18 21:50:14 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-01-18 21:50:14 +0100 |
| commit | e2f73d1e52a5b3c53f11861f31d726168ca92ce6 (patch) | |
| tree | 43be202c12b0f6c03b076d0dfb68e71c3a8ec185 /arch | |
| parent | Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/ke... (diff) | |
| parent | x86/efistub: Disable paging at mixed mode entry (diff) | |
| download | linux-e2f73d1e52a5b3c53f11861f31d726168ca92ce6.tar.xz linux-e2f73d1e52a5b3c53f11861f31d726168ca92ce6.zip | |
Merge branch 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull EFI fixes from Ingo Molnar:
"Three EFI fixes:
- Fix a slow-boot-scrolling regression but making sure we use WC for
EFI earlycon framebuffer mappings on x86
- Fix a mixed EFI mode boot crash
- Disable paging explicitly before entering startup_32() in mixed
mode bootup"
* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/efistub: Disable paging at mixed mode entry
efi/libstub/random: Initialize pointer variables to zero for mixed mode
efi/earlycon: Fix write-combine mapping on x86
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/boot/compressed/head_64.S | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index 58a512e33d8d..ee60b81944a7 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -244,6 +244,11 @@ SYM_FUNC_START(efi32_stub_entry) leal efi32_config(%ebp), %eax movl %eax, efi_config(%ebp) + /* Disable paging */ + movl %cr0, %eax + btrl $X86_CR0_PG_BIT, %eax + movl %eax, %cr0 + jmp startup_32 SYM_FUNC_END(efi32_stub_entry) #endif |