From d8825597e923d22c8f901c63a51ffd8253eb427d Mon Sep 17 00:00:00 2001
From: sunway_fw <sunway_fw@wxiat.com>
Date: Tue, 18 Feb 2025 14:50:17 +0800
Subject: [PATCH 1/5] sw64: Add early startup code

On entry, we need to save the system table pointer as well as our image
handle. Add an early startup file that saves them and then brings us
into our main function.

Signed-off-by: sunway_fw <sunway_fw@wxiat.com>
---
 grub-core/kern/sw64/efi/startup.S | 35 +++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 grub-core/kern/sw64/efi/startup.S

diff --git a/grub-core/kern/sw64/efi/startup.S b/grub-core/kern/sw64/efi/startup.S
new file mode 100644
index 0000000..8143f75
--- /dev/null
+++ b/grub-core/kern/sw64/efi/startup.S
@@ -0,0 +1,35 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2018  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+#include <grub/sw64/regdef.h>
+
+       .file   "startup.S"
+       .text
+FUNCTION(_start)
+       /*
+        *  EFI_SYSTEM_TABLE and EFI_HANDLE are passed in a1/a0.
+        */
+       ldih    $29,0($27) !gpdisp!1
+       ldi     $29,0($29) !gpdisp!1
+       ldi     $20, EXT_C(grub_efi_image_handle)
+       stl     a0, 0($20)
+       ldi     $20, EXT_C(grub_efi_system_table)
+       stl     a1,  0($20)
+       call    $31, grub_main
+       ret
-- 
2.33.0

