mainboard/emulation/qemu-aarch64: Add new board for ARMv8

This CL adds a new board, QEMU/AArch64, for ARMv8. The machine supported
is virt which is a QEMU 2.8 ARM virtual machine. The default CPU of
qemu-system-aarch64 is Cortex-a15, so you need to specify a 64-bit cpu
via a flag.

To execute:
$ qemu-system-aarch64 -M virt,secure=on,virtualization=on \
  -cpu cortex-a53 -bios build/coreboot.rom -m 8192M -nographic

Change-Id: Id7c0831b1ecf08785b4ec8139d809bad9b3e1eec
Signed-off-by: Asami Doi <d0iasm.pub@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33387
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/mainboard/emulation/qemu-aarch64/bootblock_custom.S b/src/mainboard/emulation/qemu-aarch64/bootblock_custom.S
new file mode 100644
index 0000000000..f9e85d0efc
--- /dev/null
+++ b/src/mainboard/emulation/qemu-aarch64/bootblock_custom.S
@@ -0,0 +1,36 @@
+/*
+ * Early initialization code for aarch64 (a.k.a. armv8)
+ *
+ * Copyright 2019 Asami Doi <d0iasm.pub@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <arch/asm.h>
+
+ENTRY(_start)
+	/* Setup CPU. */
+	bl      arm64_init_cpu
+
+	/* Get code positions. */
+	ldr	x1, =_flash
+	ldr	x0, =_bootblock
+
+	/* Calculate bootblock size. */
+	ldr     x2, =_ebootblock
+	sub     x2, x2, x0
+
+	/* Call memcpy in arch/arm64/memcpy.S */
+	bl	memcpy
+	dmb     sy
+
+	/* Calculate relocation offset between bootblock in flash and in DRAM. */
+ 	ldr	x0, =_flash
+	ldr	x1, =_bootblock
+	sub	x1, x1, x0
+
+	/* Jump to main() in DRAM. */
+	adr	x0, main
+	add	x0, x0, x1
+	blr	x0
+ENDPROC(_start)