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build: add initial Bootloader implementation

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Signed-off-by: EnderIce2 <enderice2@protonmail.com>
This commit is contained in:
EnderIce2
2025-01-23 21:43:03 +02:00
parent a4c5ab7ef3
commit a8ff50541a
30 changed files with 1424 additions and 25 deletions
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49
Bootloader/firmware/aarch64/raspi4/boot.S Normal file
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/*
This file is part of Lynx Bootloader.
Lynx Bootloader 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.
Lynx Bootloader 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 Lynx Bootloader. If not, see <https://www.gnu.org/licenses/>.
*/
.section ".text.boot"
.extern __bss_start
.extern __bss_end
.extern __bss_size
.global _start
_start:
/* Keep only the main core */
mrs x1, mpidr_el1
and x1, x1, #3
cbz x1, 2f
/* Halt */
1: wfe
b 1b
/* Initialize the stack */
2: ldr x1, =_start
mov sp, x1
/* Clear the BSS */
ldr x1, =__bss_start
ldr w2, =__bss_size
3: cbz w2, 4f
str xzr, [x1], #8
sub w2, w2, #1
cbnz w2, 3b
/* Start the kernel */
4: bl _aarch64_start
b 1b

32
Bootloader/firmware/aarch64/raspi4/init.c Normal file
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/*
This file is part of Lynx Bootloader.
Lynx Bootloader 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.
Lynx Bootloader 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 Lynx Bootloader. If not, see <https://www.gnu.org/licenses/>.
*/
#include <types.h>
uintptr_t __stack_chk_guard = 0;
__noreturn __no_stack_protector void __stack_chk_fail(void)
{
while (1)
;
}
int main();
__attribute__((section(".bootstrap.text"))) void _aarch64_start(uint64_t dtb_ptr32, uint64_t x1, uint64_t x2, uint64_t x3)
{
main();
}

70
Bootloader/firmware/aarch64/raspi4/linker.ld Normal file
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/*
This file is part of Lynx Bootloader.
Lynx Bootloader 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.
Lynx Bootloader 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 Lynx Bootloader. If not, see <https://www.gnu.org/licenses/>.
*/
OUTPUT_FORMAT("elf64-littleaarch64")
OUTPUT_ARCH(aarch64)
ENTRY(_start)
SECTIONS
{
. = 0x80000;
__start = .;
__text_start = .;
.text :
{
KEEP(*(.text.boot))
*(.text)
}
. = ALIGN(4096);
__text_end = .;
__rodata_start = .;
.rodata :
{
*(.rodata)
}
. = ALIGN(4096);
__rodata_end = .;
__data_start = .;
.data :
{
*(.data)
}
. = ALIGN(4096);
__data_end = .;
__bss_start = .;
.bss :
{
bss = .;
*(.bss)
}
. = ALIGN(4096);
__bss_end = .;
__bss_size = __bss_end - __bss_start; /* SIZEOF(.bss); */
__end = .;
/DISCARD/ :
{
*(.comment*)
*(.gnu*)
*(.note*)
*(.eh_frame*)
}
}