MIPS: Introduce plat_get_fdt a platform API to retrieve the FDT

[cascardo/linux.git] / arch / mips / include / asm / bootinfo.h

diff --git a/arch/mips/include/asm/bootinfo.h b/arch/mips/include/asm/bootinfo.h
index b603804..9f67033 100644 (file)
--- a/arch/mips/include/asm/bootinfo.h
+++ b/arch/mips/include/asm/bootinfo.h
@@ -144,4 +144,22 @@ static inline void plat_swiotlb_setup(void) {}
 
 #endif /* CONFIG_SWIOTLB */
 
+#ifdef CONFIG_USE_OF
+/**
+ * plat_get_fdt() - Return a pointer to the platform's device tree blob
+ *
+ * This function provides a platform independent API to get a pointer to the
+ * flattened device tree blob. The interface between bootloader and kernel
+ * is not consistent across platforms so it is necessary to provide this
+ * API such that common startup code can locate the FDT.
+ *
+ * This is used by the KASLR code to get command line arguments and random
+ * seed from the device tree. Any platform wishing to use KASLR should
+ * provide this API and select SYS_SUPPORTS_RELOCATABLE.
+ *
+ * Return: Pointer to the flattened device tree blob.
+ */
+extern void *plat_get_fdt(void);
+#endif /* CONFIG_USE_OF */
+
 #endif /* _ASM_BOOTINFO_H */