diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2018-03-08 11:00:13 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-03-09 10:58:22 +0300 |
| commit | 7e611e7dbb235938fca1dd359bad5e5f86ceabcb (patch) | |
| tree | 9ae6a27e4b8c8e5d4b3832cb9d5fad3405623917 /arch/arm64/include/asm/efi.h | |
| parent | 1832e64162ffbbbdf7230401298550f2b624351b (diff) | |
| download | linux-7e611e7dbb235938fca1dd359bad5e5f86ceabcb.tar.xz | |
efi/arm64: Check whether x18 is preserved by runtime services calls
Whether or not we will ever decide to start using x18 as a platform
register in Linux is uncertain, but by that time, we will need to
ensure that UEFI runtime services calls don't corrupt it.
So let's start issuing warnings now for this, and increase the
likelihood that these firmware images have all been replaced by that time.
This has been fixed on the EDK2 side in commit:
6d73863b5464 ("BaseTools/tools_def AARCH64: mark register x18 as reserved")
dated July 13, 2017.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20180308080020.22828-6-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm/efi.h')
| -rw-r--r-- | arch/arm64/include/asm/efi.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h index 8389050328bb..192d791f1103 100644 --- a/arch/arm64/include/asm/efi.h +++ b/arch/arm64/include/asm/efi.h @@ -31,7 +31,7 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md); ({ \ efi_##f##_t *__f; \ __f = p->f; \ - __f(args); \ + __efi_rt_asm_wrapper(__f, #f, args); \ }) #define arch_efi_call_virt_teardown() \ @@ -40,6 +40,8 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md); efi_virtmap_unload(); \ }) +efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...); + #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT) /* arch specific definitions used by the stub code */ |