Improve build transparency (documentation and inline version number)

Makefile

@@ -2,12 +2,13 @@ PROGRAMS = hello.com
 DISTFILES = $(PROGRAMS)
 ROMS =
 
-QEMU_ARCH = $(shell uname -m)
+QEMU = qemu-system-i386
-QEMU = qemu-system-$(QEMU_ARCH)
 QEMU_ARGS = $(addprefix --option-rom ,$(ROMS))
 
+VERSION = $(shell git log -1 --format=%cd --date=format:%Y%m%d)
+
 NASM = nasm
-NASM_ARGS = -s -Ilib
+NASM_ARGS = -s -Ilib -DVERSION=$(VERSION)
 
 KVM = $(shell test -w /dev/kvm && echo 1)
 

README.md

@@ -11,3 +11,20 @@
 - Boot linux
 - Editor (nano or ed-like)
 - Self-hosting assembler
+
+## Building
+
+You can generate a 3.5" floppy image with `make fd1440.img`, a 5.25" floppy with `make fd160.img`.
+
+Build requirements:
+
+- make
+- nasm
+- mtools >=4.0.20 (Debian buster or up)
+
+Useful for testing:
+
+- C compiler
+- qemu-system-i386
+
+The Makefile has other potentially interesting targets.

boot/kernel.asm

@@ -9,7 +9,10 @@
 
 		jmp near init
 
-		db "LOVELAIN"
+%defstr		STRVER VERSION
+%define		INTVER 0x %+ VERSION
+
+		db STRVER
 
 		; mformat writes stuff until 0x3E
 params:		times ( 0x3E - ($-$$) ) nop
@@ -44,6 +47,8 @@ hlt:		hlt
 
 		db "rdos kernel"
 
+		dd INTVER
+
 end:		align 512
 
 section .bss