From a2ce17753fa4a727f082bfb9bd515dc3fde56f02 Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Wed, 25 Dec 2024 02:55:41 +0100
Subject: mbr: zig only real mode 16 bit

---
 x86-bare-metal/mbr-pure-zig/Makefile | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 x86-bare-metal/mbr-pure-zig/Makefile

(limited to 'x86-bare-metal/mbr-pure-zig/Makefile')

diff --git a/x86-bare-metal/mbr-pure-zig/Makefile b/x86-bare-metal/mbr-pure-zig/Makefile
new file mode 100644
index 0000000..41d2653
--- /dev/null
+++ b/x86-bare-metal/mbr-pure-zig/Makefile
@@ -0,0 +1,29 @@
+O := BUILD
+
+COMMON_FLAGS := -fno-unwind-tables -fno-strip -target x86-freestanding-code16 -O ReleaseSmall
+
+$(O)/boot: $(O)/boot.elf | check_ep dump_info
+	objcopy -O binary $< $@
+
+$(O)/boot.elf: mbr.ld mbr.zig | $(O)
+	zig build-exe -femit-bin=$@ $(COMMON_FLAGS) -fno-entry --script $^
+
+clean:
+	$(RM) -r $(O)
+
+$(O):
+	mkdir -p $(O)
+
+# Check entry point is exactly at 0x7c00.
+check_ep: $(O)/boot.elf
+	readelf -h $< | awk '/Entry point address:/ { print $$4 }' | grep 0x7c00 >& /dev/null
+
+# Dump some debug info (disasm, elf load segments, code size).
+dump_info: $(O)/boot.elf
+	objdump -Mintel -m i8086 --disassemble --visualize-jumps=extended-color $<
+	readelf -W -l $<
+	size $<
+	size $< | awk '/$(notdir $<)/ { print "MBR utilization " $$1/512 "%" }'
+
+run: $(O)/boot
+	qemu-system-i386 -hda $< $(QEMU_ARGS)
-- 
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