linux_dsm_epyc7002/arch/x86/boot
Matt Fleming b1994304fc x86, efi: Add dedicated EFI stub entry point
The method used to work out whether we were booted by EFI firmware or
via a boot loader is broken. Because efi_main() is always executed
when booting from a boot loader we will dereference invalid pointers
either on the stack (CONFIG_X86_32) or contained in %rdx
(CONFIG_X86_64) when searching for an EFI System Table signature.

Instead of dereferencing these invalid system table pointers, add a
new entry point that is only used when booting from EFI firmware, when
we know the pointer arguments will be valid. With this change legacy
boot loaders will no longer execute efi_main(), but will instead skip
EFI stub initialisation completely.

[ hpa: Marking this for urgent/stable since it is a regression when
  the option is enabled; without the option the patch has no effect ]

Signed-off-by: Matt Fleming <matt.hfleming@intel.com>
Link: http://lkml.kernel.org/r/1334584744.26997.14.camel@mfleming-mobl1.ger.corp.intel.com
Reported-by: Jordan Justen <jordan.l.justen@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: <stable@vger.kernel.org> v3.3
2012-04-16 11:41:44 -07:00
..
compressed x86, efi: Add dedicated EFI stub entry point 2012-04-16 11:41:44 -07:00
tools x86, efi: Add dedicated EFI stub entry point 2012-04-16 11:41:44 -07:00
.gitignore x86, boot: add new generated files to the appropriate .gitignore files 2009-06-02 21:13:30 -07:00
a20.c x86, setup: "glove box" BIOS interrupts in the core boot code 2009-04-09 16:08:11 -07:00
apm.c x86, setup: "glove box" BIOS interrupts in the APM code 2009-04-09 16:08:11 -07:00
bioscall.S x86, boot: use .code16gcc instead of .code16 2009-06-16 17:47:32 -07:00
bitops.h
boot.h x86, boot: Fix port argument to inl() function 2012-01-31 12:05:54 -08:00
cmdline.c x86, setup: reorganize the early console setup 2010-08-02 15:51:56 -07:00
code16gcc.h
copy.S x86: copy.S - use GLOBAL,ENDPROC macros 2009-02-19 17:13:00 +01:00
cpu.c
cpucheck.c
ctype.h x86, setup: move isdigit.h to ctype.h, header files on top. 2010-08-02 21:07:20 -07:00
early_serial_console.c x86, setup: Fix earlyprintk=serial,0x3f8,115200 2010-09-21 10:18:33 -07:00
edd.c x86, setup: "glove box" BIOS interrupts in the EDD code 2009-04-09 16:08:11 -07:00
header.S x86, efi: EFI boot stub support 2011-12-12 14:26:10 -08:00
install.sh kbuild: use INSTALLKERNEL to select customized installkernel script 2009-09-20 12:18:14 +02:00
main.c x86, setup: enable early console output from the decompressor 2010-08-02 20:32:20 -07:00
Makefile x86, boot: Correct CFLAGS for hostprogs 2012-03-22 12:42:51 -07:00
mca.c x86, setup: "glove box" BIOS interrupts in the MCA code 2009-04-09 16:08:11 -07:00
memory.c x86, setup: When probing memory with e801, use ax/bx as a pair 2011-04-25 14:52:37 -07:00
mkcpustr.c x86: Remove trailing spaces in messages 2010-02-07 17:47:51 +01:00
mtools.conf.in
pm.c x86: remove zImage support 2009-03-11 11:00:00 -07:00
pmjump.S x86, setup: move 32-bit code to .text32 2009-03-17 15:26:06 -07:00
printf.c x86, setup: reorganize the early console setup 2010-08-02 15:51:56 -07:00
regs.c x86, setup: "glove box" BIOS calls -- infrastructure 2009-04-09 16:08:11 -07:00
setup.ld x86: Document linker script ASSERT() quirk 2009-10-16 07:18:46 +02:00
string.c x86, efi: EFI boot stub support 2011-12-12 14:26:10 -08:00
tty.c x86, setup: reorganize the early console setup 2010-08-02 15:51:56 -07:00
version.c kbuild: move utsrelease.h to include/generated 2009-12-12 13:08:15 +01:00
vesa.h
video-bios.c x86: fix usage of bios intcall() 2009-07-04 12:56:32 -07:00
video-mode.c
video-vesa.c Merge branch 'x86-setup-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-09-14 08:01:47 -07:00
video-vga.c x86, setup: Set ax register in boot vga query 2010-06-10 15:24:29 -07:00
video.c x86, setup: When restoring the screen, update boot_params.screen_info 2010-02-17 18:32:06 -08:00
video.h x86, setup: remove obsolete pre-Kconfig CONFIG_VIDEO_ variables 2009-06-26 11:02:31 -07:00