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loongarch: Add early startup code

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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: Zhou Yang <zhouyang@loongson.cn>
Signed-off-by: Xiaotian Wu <wuxiaotian@loongson.cn>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>
This commit is contained in:
Wentao Guan 2024-08-25 15:45:25 +08:00
parent fd9d0b6daa
commit e2359cc68f
1 changed files with 34 additions and 0 deletions
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34
GRUB2/MOD_SRC/grub-2.04/grub-core/kern/loongarch64/efi/startup.S Normal file
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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2023 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>
.file "startup.S"
.text
FUNCTION(_start)
/*
* EFI_SYSTEM_TABLE and EFI_HANDLE are passed in $a1/$a0.
*/
la $a2, EXT_C(grub_efi_image_handle)
st.d $a0, $a2, 0
la $a2, EXT_C(grub_efi_system_table)
st.d $a1, $a2, 0
b EXT_C(grub_main)