POC serial driver for arm

Does not work for x86 yet

repbuild/src/main.rs

@@ -149,6 +149,7 @@ fn get_fs() -> Result<FileSystem<impl ReadWriteSeek>, io::Error> {
         "target/test-programs/failure.hbf",
         "target/test-programs/ecall.hbf",
         "target/test-programs/main.hbf",
+        "target/test-programs/serial_driver.hbf",
         "target/test-programs/vfs_test.hbf",
         "target/test-programs/limine_framebuffer_driver.hbf",
     ] {

sysdata/limine.cfg

@@ -32,3 +32,6 @@ TERM_BACKDROP=008080
 
     MODULE_PATH=boot:///limine_framebuffer_driver.hbf
     MODULE_CMDLINE="height=10 width=10 arch=${ARCH}"
+
+    MODULE_PATH=boot:///serial_driver.hbf
+    MODULE_CMDLINE="arch=${ARCH}"

sysdata/test-programs/limine_framebuffer_driver.rhai

@@ -90,6 +90,14 @@ fn main(){
     li64(r2, 1);
     
     eca();
+    // Zero out all used registers
+    li64(r1, 0);
+    li64(r2, 0);
+    li64(r3, 0);
+    li64(r4, 0);
+    li64(r5, 0);
+    li64(r6, 0);
+    li64(r7, 0);
   }
   std::Info("Starting the limine framebuffer driver.");
 // un();

sysdata/test-programs/serial_driver.rhai

@@ -0,0 +1,27 @@
+import "sysdata/test-programs/hblib/std" as std;
+
+
+
+fn main(){
+    let ADDR = 0;
+    // FIXME: Actually check the arch argument
+    let architecture = "ARM";
+    if architecture == "ARM" {
+        std::Info("Arm Serial Driver");
+        ADDR = 0x09000000;
+    }
+
+
+    lra(r3, r0, ADDR);
+
+    li64(r1, 0);
+    li8(r1, 65);
+    st(r1, r0, ADDR, 1);
+        
+    // New Line
+    li8(r1, 12);st(r1, r0, ADDR, 1);
+
+    tx();
+}
+
+main();