Add separate panic display

kernel/Cargo.toml

@@ -18,5 +18,6 @@ log = "0.4.22"
 [lints.clippy]
 missing_safety_doc = "allow"
 needless_range_loop = "allow"
+too_many_arguments = "allow"
 type_complexity = "allow"
 upper_case_acronyms = "allow"

kernel/src/main.rs

@@ -23,7 +23,7 @@ use kernel_common::{
     paging::{KERNEL_HEAP_INITIAL_SIZE, KERNEL_HEAP_START},
 };
 use log::{error, info};
-use misc::display::{setup_display, DISPLAY};
+use misc::display::{setup_display, PANIC_DISPLAY};
 use sys::{
     acpica_osl::AE_OK,
     early_acpi::EarlyACPIHandler,
@@ -115,8 +115,9 @@ fn panic(info: &PanicInfo) -> ! {
         }
         error!("{}", info);
         let str = format!("{}", info);
-        let mut display = DISPLAY.lock();
+        let mut display = PANIC_DISPLAY.lock();
         if let Some(display) = display.as_mut() {
+            display.clear();
             display.print(&str);
         }
     }

kernel/src/misc/display.rs

@@ -18,7 +18,9 @@ pub struct Display {
     current_y: usize,
 }
 
+//TODO: Change to mutex
 pub static DISPLAY: Spinlock<Option<Display>> = Spinlock::new(None);
+pub static PANIC_DISPLAY: Spinlock<Option<Display>> = Spinlock::new(None);
 
 impl Display {
     fn write_char(&mut self, x: usize, y: usize, c: char) {
@@ -28,6 +30,12 @@ impl Display {
         let text = Text::new(&str, pos, style);
         text.draw(&mut self.framebuffer).unwrap();
     }
+    pub fn clear(&mut self) {
+        self.framebuffer.clear(Bgr888::BLACK).unwrap();
+        self.current_x = 0;
+        self.current_y = 0;
+        self.copy_to_fb();
+    }
     fn scroll(&mut self) {
         let line_size = self.framebuffer.stride * 20 * 4;
         self.framebuffer.framebuffer.copy_within(line_size..line_size * self.height, 0);
@@ -78,5 +86,20 @@ pub fn setup_display(info: FramebufferInfo) {
         current_x: 0,
         current_y: 0,
     };
+    *PANIC_DISPLAY.lock() = Some(display);
+    let fb = vec![0; info.height as usize * info.stride as usize * 4];
+    let display = Display {
+        framebuffer: FramebufferTarget {
+            framebuffer: fb,
+            width: info.width as usize,
+            height: info.height as usize,
+            stride: info.stride as usize,
+        },
+        framebuffer_addr: addr,
+        width: info.width as usize / 10 - 1,
+        height: info.height as usize / 20 - 1,
+        current_x: 0,
+        current_y: 0,
+    };
     *DISPLAY.lock() = Some(display);
 }

kernel/src/sys/locks.rs

@@ -15,11 +15,9 @@ unsafe impl RawMutex for RawSpinlock {
     fn lock(&self) {
         self.raw_lock();
     }
-
     fn try_lock(&self) -> bool {
         unimplemented!();
     }
-
     unsafe fn unlock(&self) {
         self.raw_unlock();
     }