1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/firmware/efi/libstub/arm64-stub.c b/drivers/firmware/efi/libstub/arm64-stub.c
new file mode 100644
index 0000000000..452b7ccd33
--- /dev/null
+++ b/drivers/firmware/efi/libstub/arm64-stub.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2013, 2014 Linaro Ltd;  <roy.franz@linaro.org>
+ *
+ * This file implements the EFI boot stub for the arm64 kernel.
+ * Adapted from ARM version by Mark Salter <msalter@redhat.com>
+ */
+
+
+#include <linux/efi.h>
+#include <asm/efi.h>
+#include <asm/memory.h>
+#include <asm/sections.h>
+
+#include "efistub.h"
+
+efi_status_t handle_kernel_image(unsigned long *image_addr,
+				 unsigned long *image_size,
+				 unsigned long *reserve_addr,
+				 unsigned long *reserve_size,
+				 efi_loaded_image_t *image,
+				 efi_handle_t image_handle)
+{
+	efi_status_t status;
+	unsigned long kernel_size, kernel_codesize, kernel_memsize;
+
+	if (image->image_base != _text) {
+		efi_err("FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value\n");
+		image->image_base = _text;
+	}
+
+	if (!IS_ALIGNED((u64)_text, SEGMENT_ALIGN))
+		efi_err("FIRMWARE BUG: kernel image not aligned on %dk boundary\n",
+			SEGMENT_ALIGN >> 10);
+
+	kernel_size = _edata - _text;
+	kernel_codesize = __inittext_end - _text;
+	kernel_memsize = kernel_size + (_end - _edata);
+	*reserve_size = kernel_memsize;
+	*image_addr = (unsigned long)_text;
+
+	status = efi_kaslr_relocate_kernel(image_addr,
+					   reserve_addr, reserve_size,
+					   kernel_size, kernel_codesize,
+					   kernel_memsize,
+					   efi_kaslr_get_phys_seed(image_handle));
+	if (status != EFI_SUCCESS)
+		return status;
+
+	return EFI_SUCCESS;
+}
+
+asmlinkage void primary_entry(void);
+
+unsigned long primary_entry_offset(void)
+{
+	/*
+	 * When built as part of the kernel, the EFI stub cannot branch to the
+	 * kernel proper via the image header, as the PE/COFF header is
+	 * strictly not part of the in-memory presentation of the image, only
+	 * of the file representation. So instead, we need to jump to the
+	 * actual entrypoint in the .text region of the image.
+	 */
+	return (char *)primary_entry - _text;
+}
+
+void efi_icache_sync(unsigned long start, unsigned long end)
+{
+	caches_clean_inval_pou(start, end);
+}