[PATCH 2/2] efi/arm64: preserve NEON registers on UEFI runtime services calls
From: Ard Biesheuvel <hidden>
Date: 2014-06-23 14:18:15
Also in:
linux-efi
Subsystem:
arm64 port (aarch64 architecture), extensible firmware interface (efi), the rest · Maintainers:
Catalin Marinas, Will Deacon, Ard Biesheuvel, Linus Torvalds
UEFI Runtime Services function calls may clobber the contents of the NEON register file, so we need to make sure that we preserve/restore them when performing such a function call. Signed-off-by: Ard Biesheuvel <redacted> --- arch/arm64/include/asm/efi.h | 21 +++++++++++++++++++++ arch/arm64/kernel/efi.c | 14 +------------- 2 files changed, 22 insertions(+), 13 deletions(-)
diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h
index 5a46c4e7f539..375ba342dca6 100644
--- a/arch/arm64/include/asm/efi.h
+++ b/arch/arm64/include/asm/efi.h@@ -2,6 +2,7 @@ #define _ASM_EFI_H #include <asm/io.h> +#include <asm/neon.h> #ifdef CONFIG_EFI extern void efi_init(void);
@@ -11,4 +12,24 @@ extern void efi_idmap_init(void); #define efi_idmap_init() #endif +#define efi_call_virt(f, ...) \ +({ \ + efi_##f##_t *__f = efi.systab->runtime->f; \ + efi_status_t __s; \ + \ + kernel_neon_begin(); \ + __s = __f(__VA_ARGS__); \ + kernel_neon_end(); \ + __s; \ +}) + +#define __efi_call_virt(f, ...) \ +({ \ + efi_##f##_t *__f = efi.systab->runtime->f; \ + \ + kernel_neon_begin(); \ + __f(__VA_ARGS__); \ + kernel_neon_end(); \ +}) + #endif /* _ASM_EFI_H */
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index 14db1f6e8d7f..56c3327bbf79 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c@@ -449,19 +449,7 @@ static int __init arm64_enter_virtual_mode(void) /* Set up runtime services function pointers */ runtime = efi.systab->runtime; - efi.get_time = runtime->get_time; - efi.set_time = runtime->set_time; - efi.get_wakeup_time = runtime->get_wakeup_time; - efi.set_wakeup_time = runtime->set_wakeup_time; - efi.get_variable = runtime->get_variable; - efi.get_next_variable = runtime->get_next_variable; - efi.set_variable = runtime->set_variable; - efi.query_variable_info = runtime->query_variable_info; - efi.update_capsule = runtime->update_capsule; - efi.query_capsule_caps = runtime->query_capsule_caps; - efi.get_next_high_mono_count = runtime->get_next_high_mono_count; - efi.reset_system = runtime->reset_system; - + efi_native_runtime_setup(); set_bit(EFI_RUNTIME_SERVICES, &efi.flags); return 0;
--
1.8.3.2