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Commit b738c6ea authored by Ricardo Neri's avatar Ricardo Neri Committed by Matt Fleming
Browse files

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: default avatarRicardo Neri <ricardo.neri-calderon@linux.intel.com>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
parent de05764e

arch/x86/include/asm/efi.h

+15 −2
Original line number Diff line number Diff line
@@ -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)