blob: 41d2653c726613f2b804d426b3c5bee8dbf87dc3 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
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)
|
