arm64/efi: isolate EFI stub from the kernel proper

[deliverable/linux.git] / arch / arm64 / kernel / image.h

diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h
index 8fae0756e1759bad77406b0e3c76cad64b998ae0..e083af0dd54661a5ea3ec9cf161e74894a3c74e2 100644 (file)
--- a/arch/arm64/kernel/image.h
+++ b/arch/arm64/kernel/image.h
@@ -59,4 +59,31 @@
        _kernel_offset_le       = DATA_LE64(TEXT_OFFSET);       \
        _kernel_flags_le        = DATA_LE64(__HEAD_FLAGS);
 
+#ifdef CONFIG_EFI
+
+/*
+ * The EFI stub has its own symbol namespace prefixed by __efistub_, to
+ * isolate it from the kernel proper. The following symbols are legally
+ * accessed by the stub, so provide some aliases to make them accessible.
+ * Only include data symbols here, or text symbols of functions that are
+ * guaranteed to be safe when executed at another offset than they were
+ * linked at. The routines below are all implemented in assembler in a
+ * position independent manner
+ */
+__efistub_memcmp               = __pi_memcmp;
+__efistub_memchr               = __pi_memchr;
+__efistub_memcpy               = __pi_memcpy;
+__efistub_memmove              = __pi_memmove;
+__efistub_memset               = __pi_memset;
+__efistub_strlen               = __pi_strlen;
+__efistub_strcmp               = __pi_strcmp;
+__efistub_strncmp              = __pi_strncmp;
+__efistub___flush_dcache_area  = __pi___flush_dcache_area;
+
+__efistub__text                        = _text;
+__efistub__end                 = _end;
+__efistub__edata               = _edata;
+
+#endif
+
 #endif /* __ASM_IMAGE_H */