build: add initial Bootloader implementation

Signed-off-by: EnderIce2 <enderice2@protonmail.com>

Bootloader/firmware/aarch64/raspi4/init.c

@@ -0,0 +1,32 @@
+/*
+	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();
+}