userlib now implements embedded_graphics::DrawTarget

abi_sys/src/lib.rs

@@ -0,0 +1,28 @@
+#![no_std]
+
+pub use embedded_graphics::{
+    Pixel,
+    geometry::Point,
+    pixelcolor::{Rgb565, RgbColor},
+};
+use shared::keyboard::{KeyCode, KeyEvent, KeyState, Modifiers};
+
+// Instead of extern, declare a static pointer in a dedicated section
+#[unsafe(no_mangle)]
+#[unsafe(link_section = ".user_reloc")]
+#[allow(non_upper_case_globals)]
+pub static mut call_abi_ptr: usize = 0;
+
+// Helper to call it
+pub unsafe fn call_abi(call: *const Syscall) {
+    let f: extern "C" fn(*const Syscall) = unsafe { core::mem::transmute(call_abi_ptr) };
+    f(call);
+}
+
+#[repr(C)]
+pub enum Syscall {
+    DrawIter {
+        pixels: *const Pixel<Rgb565>,
+        len: usize,
+    },
+}