From 5ff1344f895b2188a15806a9198470566e2a0fc9 Mon Sep 17 00:00:00 2001
From: Michael Zhang <mail@mzhang.io>
Date: Tue, 5 Dec 2023 23:56:23 -0600
Subject: [PATCH] wip

---
 .gitignore    |  2 ++
 Makefile      | 11 +++++++++++
 build.zig     | 29 +++++++++++++++++++++++++++++
 src/entry.zig |  3 +++
 src/kernel.ld |  5 +++++
 src/main.zig  |  1 +
 6 files changed, 51 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 build.zig
 create mode 100644 src/entry.zig
 create mode 100644 src/kernel.ld
 create mode 100644 src/main.zig

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..44dbeed
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+zig-cache
+zig-out
\ No newline at end of file
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a84f8c1
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+ifndef CPUS
+CPUS := 3
+endif
+
+qemu:
+	qemu-system-aarch64 \
+		-machine virt \
+		-kernel zig-out/bin/kernel \
+		-m 128M \
+		-smp $(CPUS) \
+		-nographic
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..e9f0659
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,29 @@
+const std = @import("std");
+const Builder = @import("std").build.Builder;
+const LazyPath = @import("std").build.LazyPath;
+const Target = @import("std").Target;
+const CrossTarget = @import("std").zig.CrossTarget;
+const Feature = @import("std").Target.Cpu.Feature;
+
+pub fn build(b: *Builder) void {
+    const arch = Target.Cpu.Arch.aarch64;
+    const tag = Target.Os.Tag.freestanding;
+    const target = CrossTarget.fromTarget(.{
+        .cpu = .{
+            .arch = arch,
+            .model = Target.Cpu.Model.generic(arch),
+            .features = Feature.Set.empty,
+        },
+        .os = .{ .tag = tag, .version_range = Target.Os.VersionRange.default(tag, arch) },
+        .ofmt = Target.ObjectFormat.raw,
+        .abi = Target.Abi.none,
+    });
+
+    const result = b.addExecutable(.{
+        .name = "kernel.elf",
+        .root_source_file = .{ .path = "src/entry.zig" },
+        .target = target,
+    });
+    result.setLinkerScript(.{ .path = "src/kernel.ld" });
+    b.installArtifact(result);
+}
diff --git a/src/entry.zig b/src/entry.zig
new file mode 100644
index 0000000..8af254b
--- /dev/null
+++ b/src/entry.zig
@@ -0,0 +1,3 @@
+export fn _entry() noreturn {
+    while (true) {}
+}
diff --git a/src/kernel.ld b/src/kernel.ld
new file mode 100644
index 0000000..440d820
--- /dev/null
+++ b/src/kernel.ld
@@ -0,0 +1,5 @@
+ENTRY(_entry)
+
+SECTIONS
+{
+}
diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000..2a4bf5a
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1 @@
+pub fn main() noreturn {}