From: Ricardo Neri Date: Thu, 27 Mar 2014 22:10:43 +0000 (-0700) Subject: x86/efi: Save and restore FPU context around efi_calls (i386) X-Git-Tag: next-20140428~29^2~4^2~5 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b738c6ea49b4e98e6ca0651da82a610f996a16ae;p=karo-tx-linux.git x86/efi: Save and restore FPU context around efi_calls (i386) Do a complete FPU context save/restore around the EFI calls. This required as runtime EFI firmware may potentially use the FPU. This change covers only the i386 configuration. Signed-off-by: Ricardo Neri Cc: Borislav Petkov Signed-off-by: Matt Fleming --- diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h index 0b19187cc882..1eb5f6433ad8 100644 --- a/arch/x86/include/asm/efi.h +++ b/arch/x86/include/asm/efi.h @@ -34,10 +34,23 @@ extern unsigned long asmlinkage efi_call_phys(void *, ...); /* Use this macro if your virtual returns a non-void value */ #define efi_call_virt(f, args...) \ - ((efi_##f##_t __attribute__((regparm(0)))*)efi.systab->runtime->f)(args) +({ \ + efi_status_t __s; \ + kernel_fpu_begin(); \ + __s = ((efi_##f##_t __attribute__((regparm(0)))*) \ + efi.systab->runtime->f)(args); \ + kernel_fpu_end(); \ + __s; \ +}) /* Use this macro if your virtual call does not return any value */ -#define __efi_call_virt(f, args...) efi_call_virt(f, args) +#define __efi_call_virt(f, args...) \ +({ \ + kernel_fpu_begin(); \ + ((efi_##f##_t __attribute__((regparm(0)))*) \ + efi.systab->runtime->f)(args); \ + kernel_fpu_end(); \ +}) #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)