build.zig

@@ -44,7 +44,7 @@ pub fn build(b: *std.Build) void {
     kernel_bin_copy.step.dependOn(&kernel_bin.step);
 
     const kernel_step_elf = b.step("elf", "Build the kernel ELF");
-    kernel_step_elf.dependOn(&kernel_elf_artifact.step);
+    kernel_step_elf.dependOn(&kernel_elf.step);
 
     const kernel_step_bin = b.step("bin", "Build the kernel BIN (with objcopy)");
     kernel_step_bin.dependOn(&kernel_bin_copy.step);

src/grub.cfg

@@ -1,3 +1,3 @@
 menuentry "Zig Bare Bones" {
-	multiboot /boot/kernel.bin
+	multiboot /boot/kernel.elf
 }

src/linker.ld

@@ -4,15 +4,11 @@ SECTIONS {
     . = 2M;
 
     .blob : ALIGN(4K) {
-        _header_addr = .;
         *(.multiboot)
-        _text_start = .;
         *(.text)
         *(.rodata)
         *(.data)
-        _data_end = .;
         *(COMMON)
         *(.bss)
-        _bss_end = .;
     }
-}
+}

src/main.zig

@@ -1,27 +1,23 @@
 const console = @import("console.zig");
 
-comptime {
-    asm (
-        \\ .set ALIGN, 1<<0
-        \\ .set MEMINFO, 1<<1
-        \\ .set ADDRINFO, 1<<16
-        \\ .set FLAGS, ALIGN | MEMINFO | ADDRINFO
-        \\ .set MAGIC, 0x1BADB002
-        \\ .set CHECKSUM, -(MAGIC + FLAGS)
-        \\ .section .multiboot
-        \\ .align 4
-        \\ .long MAGIC
-        \\ .long FLAGS
-        \\ .long CHECKSUM
-        \\ .long _header_addr
-        \\ .long _text_start
-        \\ .long _data_end
-        \\ .long _bss_end
-        \\ .long _start
-    );
-}
+const ALIGN = 1 << 0;
+const MEMINFO = 1 << 1;
+const MAGIC = 0x1BADB002;
+const FLAGS = ALIGN | MEMINFO;
 
-export var stack_bytes: [32 * 1024]u8 align(16) linksection(".bss") = undefined;
+const MultibootHeader = packed struct {
+    magic: i32 = MAGIC,
+    flags: i32,
+    checksum: i32,
+    padding: u32 = 0,
+};
+
+export var multiboot align(4) linksection(".multiboot") = MultibootHeader{
+    .flags = FLAGS,
+    .checksum = -(MAGIC + FLAGS),
+};
+
+export var stack_bytes: [16 * 1024]u8 align(16) linksection(".bss") = undefined;
 const stack_bytes_slice = stack_bytes[0..];
 
 export fn _start() callconv(.Naked) noreturn {
@@ -38,6 +34,4 @@ export fn _start() callconv(.Naked) noreturn {
 export fn kmain() void {
     console.initialize();
     console.puts("Hello world!");
-    console.puts("Hello world!");
-    console.puts("Hello world!");
 }