diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2020-01-03 14:39:42 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-01-10 20:55:02 +0300 |
| commit | e5f930fe8dafd2055220c95958926af16ee20713 (patch) | |
| tree | 9f6c51bdecd6b109e2a004ef9213343975018a72 /arch/x86/platform/efi/Makefile | |
| parent | a46d674068b69b3897fc0d659e25f74b7ab52647 (diff) | |
| download | linux-e5f930fe8dafd2055220c95958926af16ee20713.tar.xz | |
efi/x86: Simplify 64-bit EFI firmware call wrapper
The efi_call() wrapper used to invoke EFI runtime services serves
a number of purposes:
- realign the stack to 16 bytes
- preserve FP and CR0 register state
- translate from SysV to MS calling convention.
Preserving CR0.TS is no longer necessary in Linux, and preserving the
FP register state is also redundant in most cases, since efi_call() is
almost always used from within the scope of a pair of kernel_fpu_begin()/
kernel_fpu_end() calls, with the exception of the early call to
SetVirtualAddressMap() and the SGI UV support code.
So let's add a pair of kernel_fpu_begin()/_end() calls there as well,
and remove the unnecessary code from the assembly implementation of
efi_call(), and only keep the pieces that deal with the stack
alignment and the ABI translation.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Matthew Garrett <mjg59@google.com>
Cc: linux-efi@vger.kernel.org
Link: https://lkml.kernel.org/r/20200103113953.9571-10-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/platform/efi/Makefile')
| -rw-r--r-- | arch/x86/platform/efi/Makefile | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/platform/efi/Makefile b/arch/x86/platform/efi/Makefile index fe29f3f5d384..7ec3a8b31f8b 100644 --- a/arch/x86/platform/efi/Makefile +++ b/arch/x86/platform/efi/Makefile @@ -1,6 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 OBJECT_FILES_NON_STANDARD_efi_thunk_$(BITS).o := y -OBJECT_FILES_NON_STANDARD_efi_stub_$(BITS).o := y obj-$(CONFIG_EFI) += quirks.o efi.o efi_$(BITS).o efi_stub_$(BITS).o obj-$(CONFIG_EFI_MIXED) += efi_thunk_$(BITS).o |