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x86/efi: Save and restore FPU context around efi_calls (i386)

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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 <ricardo.neri-calderon@linux.intel.com>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Ricardo Neri 2014-03-27 15:10:43 -07:00 committed by Matt Fleming
parent de05764e0b
commit b738c6ea49
1 changed files with 15 additions and 2 deletions
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17
arch/x86/include/asm/efi.h
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@ -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)