refactored for architectures and added riscv support

kernel/src/arch/x86_64/mod.rs

@@ -0,0 +1,23 @@
+use crate::main;
+
+pub mod framebuffer;
+pub mod gdt;
+pub mod interrupts;
+pub mod qemu;
+
+bootloader_api::entry_point!(_start);
+
+fn _start(boot_info: &'static mut bootloader_api::BootInfo) -> ! {
+    gdt::init();
+    interrupts::init();
+    if let Some(framebuffer) = boot_info.framebuffer.as_mut() {
+        framebuffer::draw_test(framebuffer);
+    }
+    main();
+}
+
+pub fn hlt_loop() -> ! {
+    loop {
+        x86_64::instructions::hlt();
+    }
+}