From 23e0ccf7b5a0ccea545f231d35dbecc00011a9de Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Thu, 24 Apr 2025 00:21:02 +0200
Subject: multiboot: add multiboot example kernel

---
 x86-bare-metal/multiboot/Makefile | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 x86-bare-metal/multiboot/Makefile

(limited to 'x86-bare-metal/multiboot/Makefile')

diff --git a/x86-bare-metal/multiboot/Makefile b/x86-bare-metal/multiboot/Makefile
new file mode 100644
index 0000000..88772f5
--- /dev/null
+++ b/x86-bare-metal/multiboot/Makefile
@@ -0,0 +1,25 @@
+O := BUILD
+
+$(O)/disk.img: $(O)/kern grub
+	mkdir -p $(O)/iso/boot
+	rsync -rav $^ $(O)/iso/boot
+	grub-mkrescue -o '$@' $(O)/iso
+
+# When building the kernel we explicitly let the zig compiler emit code for a
+# very old cpu.  This way we ensure it does not emit any sse instructions, which
+# first need to be enabled before the can be used (setting up ctrl registers and
+# sse state).
+$(O)/kern: kern.ld kern.zig
+	mkdir -p $(O)
+	zig build-exe -fno-unwind-tables -femit-bin=$@ -target x86-freestanding-none -mcpu i386 -O Debug -fno-strip --script $^
+	xxd -d -e -c4 $@ | awk -f scripts/check_mbhdr.awk
+	objdump -d $@ | awk -f scripts/check_sse.awk
+
+clean:
+	$(RM) -r $(O)
+
+run: $(O)/kern
+	qemu-system-i386 -kernel $< -append mode=raw-elf
+
+run-img: $(O)/disk.img
+	qemu-system-i386 -hda $<
-- 
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