Work on fixing multiboot with flat binary kernel

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.step);
+    kernel_step_elf.dependOn(&kernel_elf_artifact.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.elf
+	multiboot /boot/kernel.bin
 }

src/linker.ld

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

src/main.zig

@@ -1,23 +1,27 @@
 const console = @import("console.zig");
 
-const ALIGN = 1 << 0;
-const MEMINFO = 1 << 1;
-const MAGIC = 0x1BADB002;
-const FLAGS = ALIGN | MEMINFO;
+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 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;
+export var stack_bytes: [32 * 1024]u8 align(16) linksection(".bss") = undefined;
 const stack_bytes_slice = stack_bytes[0..];
 
 export fn _start() callconv(.Naked) noreturn {
@@ -34,4 +38,6 @@ export fn _start() callconv(.Naked) noreturn {
 export fn kmain() void {
     console.initialize();
     console.puts("Hello world!");
+    console.puts("Hello world!");
+    console.puts("Hello world!");
 }