From 65b6f52d2e2b20c48f6dc3e37d476a8c2e2bbc73 Mon Sep 17 00:00:00 2001
From: able <abl3theabove@gmail.com>
Date: Tue, 21 Nov 2023 03:56:18 -0600
Subject: [PATCH] POC serial driver for arm

Does not work for x86 yet
---
 repbuild/src/main.rs                          |  1 +
 sysdata/limine.cfg                            |  5 +++-
 .../limine_framebuffer_driver.rhai            |  8 ++++++
 sysdata/test-programs/serial_driver.rhai      | 27 +++++++++++++++++++
 4 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 sysdata/test-programs/serial_driver.rhai

diff --git a/repbuild/src/main.rs b/repbuild/src/main.rs
index f9c06916..e2cc634d 100644
--- a/repbuild/src/main.rs
+++ b/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",
     ] {
diff --git a/sysdata/limine.cfg b/sysdata/limine.cfg
index 8e5699f6..c082f685 100644
--- a/sysdata/limine.cfg
+++ b/sysdata/limine.cfg
@@ -31,4 +31,7 @@ TERM_BACKDROP=008080
     MODULE_CMDLINE=""
 
     MODULE_PATH=boot:///limine_framebuffer_driver.hbf
-    MODULE_CMDLINE="height=10 width=10 arch=${ARCH}"
\ No newline at end of file
+    MODULE_CMDLINE="height=10 width=10 arch=${ARCH}"
+
+    MODULE_PATH=boot:///serial_driver.hbf
+    MODULE_CMDLINE="arch=${ARCH}"
\ No newline at end of file
diff --git a/sysdata/test-programs/limine_framebuffer_driver.rhai b/sysdata/test-programs/limine_framebuffer_driver.rhai
index bfd3969e..7b1a6f57 100644
--- a/sysdata/test-programs/limine_framebuffer_driver.rhai
+++ b/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();
diff --git a/sysdata/test-programs/serial_driver.rhai b/sysdata/test-programs/serial_driver.rhai
new file mode 100644
index 00000000..546b5a54
--- /dev/null
+++ b/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();
\ No newline at end of file