.gitignore

@@ -1 +1,8 @@
 /target
+/BOOT/EFI/BOOT/BOOTX64.EFI
+/BOOT/EFI/BOOT
+/BOOT/EFI
+/BOOT
+/*.fd
+
+

Makefile

@@ -13,23 +13,26 @@ qemu_drive := -drive format=raw,file=fat:rw:$(BOOT_DIR)
 target_debug := target/$(TARGET)/debug/$(PROJECT).efi
 target_release := target/$(TARGET)/release/$(PROJECT).efi
 
-.PHONY: all release debug clean run-debug run
+.PHONY: all release debug clean launch-debug launch configure
 
 all: $(target_debug) $(target_release)
 debug: $(target_debug)
 release: $(target_release)
 
+configure:
+	mkdir $(BOOT_DIR)
+
 clean:
 	rm -rv $(BOOT_DIR)
 	@RUST_TARGET_PATH=$(shell pwd) cargo clean --target $(TARGET)
 
-run-debug: $(target_debug)
+launch-debug: $(target_debug)
 	@RUST_TARGET_PATH=$(shell pwd) cargo +nightly build -Z build-std --target $(TARGET) --verbose
 	mkdir -p $(BOOT_DIR)/EFI/BOOT/
 	cp -v $(target_debug) $(BOOT_DIR)/EFI/BOOT/BOOTX64.EFI
 	@qemu-system-$(ARCH) $(qemu_args) $(qemu_efi) $(qemu_efi_vars) $(qemu_drive)
 
-run: $(target_release)
+launch: $(target_release)
 	@RUST_TARGET_PATH=$(shell pwd) cargo +nightly build -Z build-std --target $(TARGET) --release
 	mkdir -p $(BOOT_DIR)/EFI/BOOT/
 	cp -v $(target_release) $(BOOT_DIR)/EFI/BOOT/BOOTX64.EFI

src/main.rs

@@ -28,6 +28,10 @@ use uefi::{
         AllocateType, BootServices, MemoryType, OpenProtocolAttributes, OpenProtocolParams,
     },
 };
+use uefi_fb::UefiFb;
+
+mod uefi_fb;
+mod sync;
 
 #[uefi_macros::entry]
 pub fn efi_main(_image: Handle, mut st: SystemTable<Boot>) -> Status {
@@ -65,95 +69,16 @@ pub fn efi_main(_image: Handle, mut st: SystemTable<Boot>) -> Status {
         }
     };
 
+    let mut fb = uefi_fb::UefiFb::new();
     
+    // None sets a sane default of 1024x768
+    fb.set_graphics_mode(None);
+    fb.fb_blt_fill(BltPixel::new(100, 149, 237), (0, 0), (1024, 768));
 
-
+    let mi = fb.current_mode_info();
-    let handle = bt.get_handle_for_protocol::<GraphicsOutput>()
-        .expect("missing GraphicsOutput protocol");
-
-    
-    let mut gop = unsafe {
-        let mut gop_proto = st.boot_services().open_protocol::<GraphicsOutput>(
-            OpenProtocolParams {
-                handle,
-                agent: st.boot_services().image_handle(),
-                controller: None,
-            },
-            // For this test, don't open in exclusive mode. That
-            // would break the connection between stdout and the
-            // video console.
-            OpenProtocolAttributes::GetProtocol,
-        )
-        .expect("failed to open Graphics Output Protocol");
-
-        gop_proto
-    };
-    
-    set_graphics_mode(&mut gop);
-    fill_color(&mut gop);
-    draw_fb(&mut gop);
-    info!("GOP Framebuffer test complete");
-    
-    // Return success status
-    Status::SUCCESS
-}
-
-// Set a larger graphics mode.
-fn set_graphics_mode(gop: &mut GraphicsOutput) {
-    // We know for sure QEMU has a 1024x768 mode.
-    let mode = gop
-        .modes()
-        .find(|mode| {
-            let info = mode.info();
-            info.resolution() == (1024, 768)
-        })
-        .unwrap();
-
-    gop.set_mode(&mode).expect("Failed to set graphics mode");
-}
-
-// Fill the screen with color.
-fn fill_color(gop: &mut GraphicsOutput) {
-    let op = BltOp::VideoFill {
-        // Cornflower blue.
-        color: BltPixel::new(100, 149, 237),
-        dest: (0, 0),
-        dims: (1024, 768),
-    };
-
-    gop.blt(op).expect("Failed to fill screen with color");
-}
-
-// Draw directly to the frame buffer.
-fn draw_fb(gop: &mut GraphicsOutput) {
-    // The `virtio-gpu-pci` graphics device we use on aarch64 doesn't
-    // support `PixelFormat::BltOnly`.
-    if cfg!(target_arch = "aarch64") {
-        return;
-    }
-
-    let mi = gop.current_mode_info();
     let stride = mi.stride();
     let (width, height) = mi.resolution();
 
-    let mut fb = gop.frame_buffer();
-
-    type PixelWriter = unsafe fn(&mut FrameBuffer, usize, [u8; 3]);
-    unsafe fn write_pixel_rgb(fb: &mut FrameBuffer, pixel_base: usize, rgb: [u8; 3]) {
-        fb.write_value(pixel_base, rgb);
-    }
-    unsafe fn write_pixel_bgr(fb: &mut FrameBuffer, pixel_base: usize, rgb: [u8; 3]) {
-        fb.write_value(pixel_base, [rgb[2], rgb[1], rgb[0]]);
-    }
-    let write_pixel: PixelWriter = match mi.pixel_format() {
-        PixelFormat::Rgb => write_pixel_rgb,
-        PixelFormat::Bgr => write_pixel_bgr,
-        _ => {
-            info!("This pixel format is not supported by the drawing demo");
-            return;
-        }
-    };
-
     let mut fill_rectangle = |(x1, y1), (x2, y2), color| {
         assert!((x1 < width) && (x2 < width), "Bad X coordinate");
         assert!((y1 < height) && (y2 < height), "Bad Y coordinate");
@@ -162,7 +87,7 @@ fn draw_fb(gop: &mut GraphicsOutput) {
                 unsafe {
                     let pixel_index = (row * stride) + column;
                     let pixel_base = 4 * pixel_index;
-                    write_pixel(&mut fb, pixel_base, color);
+                    fb.draw_fb(pixel_base, color);
                 }
             }
         }
@@ -170,4 +95,7 @@ fn draw_fb(gop: &mut GraphicsOutput) {
 
     fill_rectangle((50, 30), (150, 600), [250, 128, 64]);
     fill_rectangle((400, 120), (750, 450), [16, 128, 255]);
+
+    info!("GOP Framebuffer test complete");
+    Status::SUCCESS
 }

src/sync/mod.rs

@@ -0,0 +1,57 @@
+use core::arch::asm;
+use core::sync::atomic::{AtomicBool, Ordering};
+use core::cell::UnsafeCell;
+
+pub struct Spinlock<T> {
+    locked: AtomicBool,
+    data: UnsafeCell<T>,
+}
+
+unsafe impl<T: Send> Sync for Spinlock<T> {}
+
+impl<T> Spinlock<T> {
+    pub const fn new(data: T) -> Self {
+        Self {
+            locked: AtomicBool::new(false),
+            data: UnsafeCell::new(data),
+        }
+    }
+
+    pub fn lock(&self) -> SpinlockGuard<T> {
+        while let Err(_) = self.locked.compare_exchange(false, true, Ordering::Acquire, Ordering::Relaxed) {
+            while self.locked.load(Ordering::Relaxed) {
+                // Spin until the lock is released
+                unsafe { asm!("pause") };
+            }
+        }
+    
+        SpinlockGuard {
+            spinlock: &self,
+        }
+    }
+    
+}
+
+pub struct SpinlockGuard<'a, T> {
+    spinlock: &'a Spinlock<T>,
+}
+
+impl<'a, T> core::ops::Deref for SpinlockGuard<'a, T> {
+    type Target = T;
+
+    fn deref(&self) -> &T {
+        unsafe { &*self.spinlock.data.get() }
+    }
+}
+
+impl<'a, T> core::ops::DerefMut for SpinlockGuard<'a, T> {
+    fn deref_mut(&mut self) -> &mut T {
+        unsafe { &mut *self.spinlock.data.get() }
+    }
+}
+
+impl<'a, T> Drop for SpinlockGuard<'a, T> {
+    fn drop(&mut self) {
+        self.spinlock.locked.store(false, Ordering::Release);
+    }
+}

src/uefi_fb/mod.rs

@@ -0,0 +1,114 @@
+use core::ffi::c_void;
+use core::ptr;
+use uefi::Handle;
+use uefi::proto::ProtocolPointer;
+use uefi::table::boot::ScopedProtocol;
+use uefi::{prelude::*, Identify};
+use uefi::{
+    proto::console::gop::{BltOp, BltPixel, FrameBuffer, GraphicsOutput, PixelFormat},
+    table::boot::{
+        AllocateType, BootServices, MemoryType, OpenProtocolAttributes, OpenProtocolParams,
+    },
+};
+use alloc::sync::Arc;
+use crate::sync;
+use crate::sync::{Spinlock, SpinlockGuard};
+
+pub struct UefiFb<'a> {
+    gop: ScopedProtocol<'a, GraphicsOutput<'a>>
+}
+
+impl<'a> core::ops::Deref for UefiFb<'a> {
+    type Target = ScopedProtocol<'a, GraphicsOutput<'a>>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.gop
+    }
+}
+
+impl<'a> UefiFb<'a> {
+
+    pub fn new() -> UefiFb<'a> {
+        let st_ref = unsafe { uefi_services::system_table().as_ref() };
+        let bt = st_ref.boot_services();
+
+        let handle = bt.get_handle_for_protocol::<GraphicsOutput>()
+        .expect("missing GraphicsOutput protocol");
+
+    
+        let mut gop = unsafe {
+            let mut gop_proto = bt.open_protocol::<GraphicsOutput>(
+                OpenProtocolParams {
+                    handle,
+                    agent: bt.image_handle(),
+                    controller: None,
+                },
+                // For this test, don't open in exclusive mode. That
+                // would break the connection between stdout and the
+                // video console.
+                OpenProtocolAttributes::GetProtocol,
+            )
+            .expect("failed to open Graphics Output Protocol");
+
+            gop_proto
+        };
+        
+        UefiFb { gop }
+        
+        }
+    
+    // Set a larger graphics mode.
+    pub fn set_graphics_mode(&mut self, mode_tuple: Option<(i16,i16,i16)>) {
+        if mode_tuple == None {
+            // We know for sure QEMU has a 1024x768 mode.
+            let mode = self.gop
+            .modes()
+            .find(|mode| {
+                let info = mode.info();
+                info.resolution() == (1024, 768)
+            })
+            .unwrap();
+
+            self.gop.set_mode(&mode).expect("Failed to set graphics mode");
+        } else {
+            unimplemented!()
+        }
+    }
+
+    // Fill the screen with color.
+    pub fn fb_blt_fill(&mut self, color: BltPixel, dest: (usize, usize), dims: (usize, usize)) {
+        let op = BltOp::VideoFill {
+            color,
+            dest,
+            dims
+        };
+
+        self.gop.blt(op).expect("Failed to fill screen with color");
+    }
+
+    // Draw directly to the frame buffer.
+    pub fn draw_fb(&mut self, index: usize, rgb: [u8; 3]) {
+        let mi = self.gop.current_mode_info();
+        let mut fb = self.gop.frame_buffer();
+
+        type PixelWriter = unsafe fn(&mut FrameBuffer, usize, [u8; 3]);
+
+        unsafe fn write_pixel_rgb(fb: &mut FrameBuffer, index: usize, rgb: [u8; 3]) {
+            fb.write_value(index, rgb);
+        }
+        unsafe fn write_pixel_bgr(fb: &mut FrameBuffer, index: usize, rgb: [u8; 3]) {
+            fb.write_value(index, [rgb[2], rgb[1], rgb[0]]);
+        }
+
+        let write_pixel: PixelWriter = match mi.pixel_format() {
+            PixelFormat::Rgb => write_pixel_rgb,
+            PixelFormat::Bgr => write_pixel_bgr,
+            _ => {
+                info!("This pixel format is not supported by the drawing demo");
+                return;
+            }
+        };
+
+        unsafe { write_pixel(&mut fb, index, rgb) };
+    }
+}