1 files changed, 34 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-qemu-sbsa/boot0.h b/arch/arm/include/asm/arch-qemu-sbsa/boot0.h
new file mode 100644
index 00000000000..4a1a254b923
--- /dev/null
+++ b/arch/arm/include/asm/arch-qemu-sbsa/boot0.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * sbsa-ref starts U-Boot in XIP memory. Need to relocate U-Boot
+ * to DRAM which is already up. Instead of using SPL this simple loader
+ * is being used.
+ */
+relocate_check:
+	/* x0 contains the pointer to FDT provided by ATF */
+	adr	x1, _start		/* x1 <- Runtime value of _start */
+	ldr	x2, _TEXT_BASE		/* x2 <- Linked value of _start */
+	subs	x9, x1, x2		/* x9 <- Run-vs-link offset */
+	beq	reset
+
+	adrp	x1, __image_copy_start		/* x2 <- address bits [31:12] */
+	add	x1, x1, :lo12:__image_copy_start/* x2 <- address bits [11:00] */
+	adrp	x3, __image_copy_end		/* x3 <- address bits [31:12] */
+	add	x3, x3, :lo12:__image_copy_end	/* x3 <- address bits [11:00] */
+	add	x3, x3, #0x100000		/* 1 MiB for the DTB found at _end */
+
+copy_loop:
+	ldp	x10, x11, [x1], #16	/* copy from source address [x1] */
+	stp	x10, x11, [x2], #16	/* copy to   target address [x2] */
+	cmp	x1, x3			/* until source end address [x3] */
+	b.lo	copy_loop
+
+	isb
+	ldr	x2, _TEXT_BASE		/* x2 <- Linked value of _start */
+	br	x2			/* Jump to linked address */
+	/* Never reaches this point */
+1:
+	wfi
+	b 1b
+
+relocate_done:
+\ No newline at end of file