refactor: move directories around a bit

build.zig

@@ -72,7 +72,21 @@ pub fn build(b: *std.Build) void {
 
     base_module.addImport("base", base_module);
 
-    const kernel_nosym = addKernel(b, plat, optimize, config_module, empty_ksyms_module, rtl_module, base_module);
+    const arch = if (plat.os == .freestanding) switch (plat.arch) {
+        .x86_64 => "amd64",
+        else => @tagName(plat.arch),
+    } else "um";
+
+    const arch_module = b.createModule(.{
+        .root_source_file = b.path(b.fmt("src/arch/{s}/root.zig", .{arch})),
+        .optimize = optimize,
+        .imports = &.{
+            .{ .name = "config", .module = config_module },
+            .{ .name = "rtl", .module = rtl_module },
+        },
+    });
+
+    const kernel_nosym = addKernel(b, plat, optimize, config_module, empty_ksyms_module, rtl_module, base_module, arch_module);
 
     b.step("kernel-nosym", "Build nosym kernel").dependOn(&kernel_nosym.step);
 
@@ -89,7 +103,7 @@ pub fn build(b: *std.Build) void {
     });
 
     // second pass
-    const kernel = addKernel(b, plat, optimize, config_module, ksyms_module, rtl_module, base_module);
+    const kernel = addKernel(b, plat, optimize, config_module, ksyms_module, rtl_module, base_module, arch_module);
 
     b.default_step.dependOn(&b.addInstallArtifact(kernel, .{}).step);
 
@@ -167,7 +181,7 @@ fn targetQueryForPlatform(plat: config.Platform) std.Target.Query {
     return q;
 }
 
-fn addKernel(b: *std.Build, plat: config.Platform, optimize: std.builtin.OptimizeMode, config_module: *std.Build.Module, ksyms_module: *std.Build.Module, rtl: *std.Build.Module, base: *std.Build.Module) *std.Build.Step.Compile {
+fn addKernel(b: *std.Build, plat: config.Platform, optimize: std.builtin.OptimizeMode, config_module: *std.Build.Module, ksyms_module: *std.Build.Module, rtl: *std.Build.Module, base: *std.Build.Module, arch: *std.Build.Module) *std.Build.Step.Compile {
     const target = b.resolveTargetQuery(targetQueryForPlatform(plat));
 
     const name = b.fmt("kernel-{s}", .{@tagName(plat.arch)});
@@ -176,9 +190,11 @@ fn addKernel(b: *std.Build, plat: config.Platform, optimize: std.builtin.Optimiz
         switch (bl) {
             .Limine => "boot/limine",
         }
-    else if (plat.os == .linux) "um" else @tagName(plat.arch);
+    else if (plat.os == .linux) "platform/um" else @tagName(plat.arch);
 
-    const root_source_file = b.fmt("src/platform/{s}/entry.zig", .{platform_name});
+    base.addImport("arch", arch);
+
+    const root_source_file = b.fmt("src/{s}/entry.zig", .{platform_name});
 
     const kernel = b.addExecutable(.{
         .name = name,

src/arch/amd64/root.zig

@@ -0,0 +1,2 @@
+pub const cpu = @import("cpu.zig");
+pub const name = "amd64";

src/arch/um/root.zig

@@ -0,0 +1 @@
+pub const name = "um";

src/kern/amd64/impl.zig

@@ -1,7 +1,7 @@
 const b = @import("base");
 const ke = b.ke;
 const pl = b.pl;
-const amd64 = pl.impl;
+const amd64 = b.arch;
 
 const std = @import("std");
 

src/kern/init.zig

@@ -2,6 +2,7 @@ const std = @import("std");
 const b = @import("base");
 const pl = b.pl;
 const ke = b.ke;
+const arch = b.arch;
 const ki = ke.private;
 const ex = b.ex;
 
@@ -17,7 +18,7 @@ pub fn init(boot_info: *pl.BootInfo) linksection(b.init) void {
     thread0.priority = 0;
     thread0.priority_class = .Idle;
 
-    std.log.info("Zag for {s}, cmdline is \"{?s}\"", .{ pl.name, boot_info.cmdline });
+    std.log.info("Zag for {s} ({s}), cmdline is \"{?s}\"", .{ pl.name, arch.name, boot_info.cmdline });
 
     ex.private.init(boot_info);
 }

src/platform/pc/impl.zig

@@ -1,9 +1,11 @@
 const b = @import("base");
-pub const cpu = @import("cpu.zig");
-const ki = b.ke.private;
+const amd64 = b.arch;
 const std = @import("std");
 
-pub const name = "amd64";
+const ki = b.ke.private;
+const cpu = amd64.cpu;
+
+pub const name = "PC";
 
 const com1 = 0x3F8;
 

src/platform/root.zig

@@ -4,7 +4,7 @@
 const config = @import("config");
 
 pub const impl = if (@hasDecl(config, "CONFIG_ARCH_AMD64"))
-    @import("amd64/impl.zig")
+    @import("pc/impl.zig")
 else if (@hasDecl(config, "CONFIG_ARCH_UM"))
     @import("um/impl.zig")
 else

src/root.zig

@@ -4,6 +4,7 @@ pub const ex = @import("ex/root.zig");
 pub const pl = @import("platform/root.zig");
 pub const rtl = @import("rtl");
 pub const ksyms = @import("ksyms");
+pub const arch = @import("arch");
 
 pub const init = ".text.init";
 pub const percpu_init = ".percpu_init_array";