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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/firmware/efi/libstub/arm64-stub.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/firmware/efi/libstub/arm64-stub.c')
-rw-r--r--drivers/firmware/efi/libstub/arm64-stub.c70
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);
+}