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author | Ricardo Neri <ricardo.neri-calderon@linux.intel.com> | 2014-03-27 22:10:41 (GMT) |
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committer | Matt Fleming <matt.fleming@intel.com> | 2014-04-17 12:26:32 (GMT) |
commit | 982e239cd2c73d2c70e14615a42c0c7391415a44 (patch) | |
tree | f0b4798deabb3863523a3cea7a795cfd6b545f4b /arch/x86/include/asm | |
parent | c6b406919288a617815f710175da20f3fca72065 (diff) | |
download | linux-982e239cd2c73d2c70e14615a42c0c7391415a44.tar.xz |
x86/efi: Implement a __efi_call_virt macro
For i386, all the EFI system runtime services functions return efi_status_t
except efi_reset_system_system. Therefore, not all functions can be covered
by the same macro in case the macro needs to do more than calling the function
(i.e., return a value). The purpose of the __efi_call_virt macro is to be used
when no return value is expected.
For x86_64, this macro would not be needed as all the runtime services return
u64. However, the same code is used for both x86_64 and i386. Thus, the macro
__efi_call_virt is also defined to not break compilation.
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>
Diffstat (limited to 'arch/x86/include/asm')
-rw-r--r-- | arch/x86/include/asm/efi.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h index e397559..19292e7 100644 --- a/arch/x86/include/asm/efi.h +++ b/arch/x86/include/asm/efi.h @@ -31,9 +31,13 @@ extern unsigned long asmlinkage efi_call_phys(void *, ...); * Wrap all the virtual calls in a way that forces the parameters on the stack. */ +/* 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) +/* 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_ioremap(addr, size, type, attr) ioremap_cache(addr, size) #else /* !CONFIG_X86_32 */ @@ -55,6 +59,12 @@ extern u64 asmlinkage efi_call(void *fp, ...); __s; \ }) +/* + * All X86_64 virt calls return non-void values. Thus, use non-void call for + * virt calls that would be void on X86_32. + */ +#define __efi_call_virt(f, args...) efi_call_virt(f, args) + extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size, u32 type, u64 attribute); |