all: use root boot info pointer

src/kern/init.zig

@@ -11,12 +11,11 @@ var stack: [r.kib(16)]u8 align(16) = undefined;
 
 pub fn init(boot_info: *r.BootInfo) linksection(r.init) void {
     r.boot_info = boot_info;
-
     ke.ncpus = 1;
     ki.impl.early_init();
-    ki.tunable.init(boot_info);
+    ki.tunable.init();
     std.log.info("Welcome to the machine", .{});
-    pl.early_init(boot_info);
+    pl.early_init();
     ki.log.init();
     ki.cpu.init_cpu(0);
     ki.turnstile.init_turnstiles();

src/kern/tunable.zig

@@ -42,8 +42,8 @@ pub fn Tunable(comptime T: type, comptime default: T, comptime name: []const u8)
     };
 }
 
-pub fn init(boot_info: *r.BootInfo) void {
-    const cmdline = boot_info.cmdline orelse return;
+pub fn init() void {
+    const cmdline = r.boot_info.cmdline orelse return;
 
     const elems = set.elems();