init

kernel/src/main.rs

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+#![no_std]
+#![no_main]
+
+use core::arch::asm;
+use core::fmt::{self, Write};
+use limine::BaseRevision;
+use limine::request::{FramebufferRequest, RequestsEndMarker, RequestsStartMarker};
+
+use embedded_graphics::{
+    mono_font::{ascii::FONT_6X10, MonoTextStyle},
+    pixelcolor::Rgb888,
+    prelude::*,
+    text::Text,
+    Drawable,
+};
+
+// Отрисовка пикселей
+struct FramebufferDisplay<'a> {
+    framebuffer: &'a limine::framebuffer::Framebuffer<'a>,
+}
+
+impl DrawTarget for FramebufferDisplay<'_> {
+    type Color = Rgb888;
+    type Error = core::convert::Infallible;
+
+    fn draw_iter<I>(&mut self, pixels: I) -> Result<(), Self::Error>
+    where I: IntoIterator<Item = Pixel<Self::Color>> {
+        for Pixel(coord, color) in pixels {
+            if coord.x >= 0 && coord.x < self.framebuffer.width() as i32 &&
+               coord.y >= 0 && coord.y < self.framebuffer.height() as i32 {
+                
+                let offset = (coord.y as usize * self.framebuffer.pitch() as usize) + (coord.x as usize * 4);
+                
+                unsafe {
+                    self.framebuffer.addr().add(offset).cast::<u32>().write(color.into_storage());
+                }
+            }
+        }
+        Ok(())
+    }
+}
+
+impl OriginDimensions for FramebufferDisplay<'_> {
+    fn size(&self) -> Size {
+        Size::new(self.framebuffer.width() as u32, self.framebuffer.height() as u32)
+    }
+}
+
+// Терминальный вывод. Следит за положением курсора и умеет двигать текст
+struct Console<'a> {
+    display: FramebufferDisplay<'a>,
+    x: i32,
+    y: i32,
+}
+
+impl<'a> Console<'a> {
+    pub fn new(display: FramebufferDisplay<'a>) -> Self {
+        Self { display, x: 10, y: 20 } // Начальный отступ
+    }
+
+    // Метод для очистки экрана
+    pub fn clear(&mut self) {
+        let size = self.display.size();
+        let fb = self.display.framebuffer;
+        unsafe {
+            // Быстрая очистка через заполнение памяти нулями
+            core::ptr::write_bytes(fb.addr(), 0, fb.pitch() as usize * fb.height() as usize);
+        }
+        self.x = 10;
+        self.y = 20;
+    }
+
+    // Логика скроллинга. копирует пиксели снизу вверх
+    fn scroll(&mut self) {
+        let fb = self.display.framebuffer;
+        let pitch = fb.pitch() as usize;
+        let height = fb.height() as usize;
+        let font_height = 10; // Высота FONT_6X10
+        let shift = font_height * pitch;
+
+        unsafe {
+            let addr = fb.addr();
+            // Копируем всё содержимое экрана на одну строку вверх
+            core::ptr::copy(
+                addr.add(shift),
+                addr,
+                pitch * (height - font_height)
+            );
+            // Очищаем последнюю строку
+            core::ptr::write_bytes(
+                addr.add(pitch * (height - font_height)),
+                0,
+                shift
+            );
+        }
+        self.y -= font_height as i32;
+    }
+}
+
+// Вывод текста. write!(console, "Hello {}", name)
+impl fmt::Write for Console<'_> {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        let style = MonoTextStyle::new(&FONT_6X10, Rgb888::WHITE);
+        
+        for c in s.chars() {
+            if c == '\n' {
+                self.x = 10;
+                self.y += 10;
+            } else {
+                // Если текст выходит за границы экрана — перенос строки
+                if self.x + 6 > self.display.framebuffer.width() as i32 {
+                    self.x = 10;
+                    self.y += 10;
+                }
+
+                // Рисуем символ (превращаем char в временную строку &str)
+                let mut buf = [0u8; 4];
+                let s_char = c.encode_utf8(&mut buf);
+                let _ = Text::new(s_char, Point::new(self.x, self.y), style).draw(&mut self.display);
+                
+                self.x += 6; // Ширина FONT_6X10
+            }
+
+            // Если достигли низа экрана, то скроллим
+            if self.y > self.display.framebuffer.height() as i32 - 10 {
+                self.scroll();
+            }
+        }
+        Ok(())
+    }
+}
+
+// boot
+#[used]
+#[unsafe(link_section = ".requests")]
+static BASE_REVISION: BaseRevision = BaseRevision::new();
+
+#[used]
+#[unsafe(link_section = ".requests")]
+static FRAMEBUFFER_REQUEST: FramebufferRequest = FramebufferRequest::new();
+
+#[used]
+#[unsafe(link_section = ".requests_start_marker")]
+static _START_MARKER: RequestsStartMarker = RequestsStartMarker::new();
+#[used]
+#[unsafe(link_section = ".requests_end_marker")]
+static _END_MARKER: RequestsEndMarker = RequestsEndMarker::new();
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn kmain() -> ! {
+    assert!(BASE_REVISION.is_supported());
+
+    if let Some(framebuffer_response) = FRAMEBUFFER_REQUEST.get_response() {
+        if let Some(fb) = framebuffer_response.framebuffers().next() {
+            
+            // Инициализируем консоль
+            let mut console = Console::new(FramebufferDisplay { framebuffer: &fb });
+            console.clear();
+
+            let _ = writeln!(console, "RINA Kernel");
+            let _ = writeln!(console, "-----------------------");
+            let _ = writeln!(console, "Framebuffer: {}x{}", fb.width(), fb.height());
+            let _ = writeln!(console, "Memory mapping... OK");
+            let _ = writeln!(console, "Hello, Arina! Terminal mode active :3");
+            
+            // Тест скроллинга: выведем много строк
+            for i in 0..5 {
+                let _ = writeln!(console, "System log entry #{}", i);
+            }
+        }
+    }
+
+    hcf();
+}
+
+#[panic_handler]
+fn rust_panic(_info: &core::panic::PanicInfo) -> ! {
+    // В будущем тут будет выводиться текст ошибки
+    hcf();
+}
+
+fn hcf() -> ! {
+    loop {
+        unsafe {
+            #[cfg(target_arch = "x86_64")]
+            asm!("hlt");
+            #[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
+            asm!("wfi");
+            #[cfg(target_arch = "loongarch64")]
+            asm!("idle 0");
+        }
+    }
+}