efi.h: Do not use config options

Currently efi.h determines a few bits of its environment according to
config options. This falls apart with the efi stub support which may
result in efi.h getting pulled into the stub as well as real U-Boot
code. In that case, one may be 32bit while the other one is 64bit.

This patch changes the conditionals to use compiler provided defines
instead. That way we always adhere to the build environment we're in
and the definitions adjust automatically.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: added some comments to describe the __x86_64__ check]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/include/efi.h b/include/efi.h
index 2448dde3fe7643fe22d0c7c4c0ca1ca62ce56ef3..0fe15e65c06c6737d2c6b5ce1da765b25c5afc80 100644 (file)
--- a/include/efi.h
+++ b/include/efi.h
@@ -19,12 +19,19 @@
 #include <linux/string.h>
 #include <linux/types.h>
 
-#if CONFIG_EFI_STUB_64BIT || (!defined(CONFIG_EFI_STUB) && defined(__x86_64__))
-/* EFI uses the Microsoft ABI which is not the default for GCC */
+/*
+ * EFI on x86_64 uses the Microsoft ABI which is not the default for GCC.
+ *
+ * There are two scenarios for EFI on x86_64: building a 64-bit EFI stub
+ * codes (CONFIG_EFI_STUB_64BIT) and building a 64-bit U-Boot (CONFIG_X86_64).
+ * Either needs to be properly built with the '-m64' compiler flag, and hence
+ * it is enough to only check the compiler provided define __x86_64__ here.
+ */
+#ifdef __x86_64__
 #define EFIAPI __attribute__((ms_abi))
 #else
 #define EFIAPI asmlinkage
-#endif
+#endif /* __x86_64__ */
 
 struct efi_device_path;
 
@@ -32,16 +39,7 @@ typedef struct {
        u8 b[16];
 } efi_guid_t;
 
-#define EFI_BITS_PER_LONG      BITS_PER_LONG
-
-/*
- * With 64-bit EFI stub, EFI_BITS_PER_LONG has to be 64. EFI_STUB is set
- * in lib/efi/Makefile, when building the stub.
- */
-#if defined(CONFIG_EFI_STUB_64BIT) && defined(EFI_STUB)
-#undef EFI_BITS_PER_LONG
-#define EFI_BITS_PER_LONG      64
-#endif
+#define EFI_BITS_PER_LONG      (sizeof(long) * 8)
 
 /* Bit mask for EFI status code with error */
 #define EFI_ERROR_MASK (1UL << (EFI_BITS_PER_LONG - 1))

diff --git a/lib/efi/Makefile b/lib/efi/Makefile
index f1a3929e32bd57fe535db4d0ca3091d06580a0a2..a790d2d554cdf82f78181ce772ac813eacfe2ee6 100644 (file)
--- a/lib/efi/Makefile
+++ b/lib/efi/Makefile
@@ -7,11 +7,11 @@ obj-$(CONFIG_EFI_STUB) += efi_info.o
 
 CFLAGS_REMOVE_efi_stub.o := -mregparm=3 \
        $(if $(CONFIG_EFI_STUB_64BIT),-march=i386 -m32)
-CFLAGS_efi_stub.o := -fpic -fshort-wchar -DEFI_STUB \
+CFLAGS_efi_stub.o := -fpic -fshort-wchar \
        $(if $(CONFIG_EFI_STUB_64BIT),-m64)
 CFLAGS_REMOVE_efi.o := -mregparm=3 \
        $(if $(CONFIG_EFI_STUB_64BIT),-march=i386 -m32)
-CFLAGS_efi.o := -fpic -fshort-wchar -DEFI_STUB \
+CFLAGS_efi.o := -fpic -fshort-wchar \
        $(if $(CONFIG_EFI_STUB_64BIT),-m64)
 
 extra-$(CONFIG_EFI_STUB) += efi_stub.o efi.o