From 9bbc0e19a1a30a3554ebbaa29502cc682bdcd081 Mon Sep 17 00:00:00 2001
From: able <abl3theabove@gmail.com>
Date: Fri, 14 Jul 2023 19:38:13 -0500
Subject: [PATCH] ARM: it compiles but does not yet run :V

---
 kernel/lds/aarch64-qemu.ld              | 14 +++++++++++++
 kernel/src/arch/aarch64/mod.rs          | 27 +++++++++++++++++++++++--
 kernel/targets/aarch64-virt-ableos.json |  2 +-
 repbuild/src/main.rs                    |  3 ++-
 4 files changed, 42 insertions(+), 4 deletions(-)
 create mode 100644 kernel/lds/aarch64-qemu.ld

diff --git a/kernel/lds/aarch64-qemu.ld b/kernel/lds/aarch64-qemu.ld
new file mode 100644
index 00000000..e3a62a2e
--- /dev/null
+++ b/kernel/lds/aarch64-qemu.ld
@@ -0,0 +1,14 @@
+ENTRY(_start)
+SECTIONS
+{
+    . = 0x40080000;
+    .text.boot : { *(.text.boot) }
+    .text : { *(.text) }
+    .data : { *(.data) }
+    .rodata : { *(.rodata) }
+    .bss : { *(.bss) }
+
+    . = ALIGN(8);
+    . = . + 0x4000;
+    LD_STACK_PTR = .;
+}
\ No newline at end of file
diff --git a/kernel/src/arch/aarch64/mod.rs b/kernel/src/arch/aarch64/mod.rs
index 68328c12..825d19c6 100644
--- a/kernel/src/arch/aarch64/mod.rs
+++ b/kernel/src/arch/aarch64/mod.rs
@@ -1,4 +1,27 @@
 //!
-
+use core::ptr;
 #[no_mangle]
-unsafe extern "C" fn _kernel_start() -> ! {}
+unsafe extern "C" fn _kernel_start() -> ! {
+    const UART0: *mut u8 = 0x0900_0000 as *mut u8;
+    let out_str = b"AArch64 Bare Metal";
+    for byte in out_str {
+        unsafe {
+            ptr::write_volatile(UART0, *byte);
+        }
+    }
+
+    loop {}
+}
+
+pub fn log(_args: core::fmt::Arguments<'_>) -> core::fmt::Result {
+    panic!()
+}
+
+pub fn sloop() -> ! {
+    loop {}
+}
+pub fn hardware_random_u64() -> u64 {
+    0
+}
+
+pub const PAGE_SIZE: usize = 10;
diff --git a/kernel/targets/aarch64-virt-ableos.json b/kernel/targets/aarch64-virt-ableos.json
index dfb116aa..fcb14d00 100644
--- a/kernel/targets/aarch64-virt-ableos.json
+++ b/kernel/targets/aarch64-virt-ableos.json
@@ -10,7 +10,7 @@
     "linker-is-gnu": true,
     "pre-link-args": {
         "ld.lld": [
-            "-Taarch64-qemu.ld"
+            "-Tkernel/lds/aarch64-qemu.ld"
         ]
     },
     "llvm-target": "aarch64-unknown-none",
diff --git a/repbuild/src/main.rs b/repbuild/src/main.rs
index 0af16595..d7d688ec 100644
--- a/repbuild/src/main.rs
+++ b/repbuild/src/main.rs
@@ -225,7 +225,8 @@ fn run(release: bool, target: Target) -> Result<(), Error> {
     if target == Target::Aarch64 {
         com.args([
             "-M", "virt", "-m", //
-            "128M", "-serial", "stdio",
+            "128M",
+            // "-serial", "stdio",
         ]);
     }