From c51dca994968dc54ae59ac68347cbc3c287b3659 Mon Sep 17 00:00:00 2001
From: Nero <41307858+nero@users.noreply.github.com>
Date: Wed, 25 Mar 2020 20:56:00 +0000
Subject: [PATCH] add kernel stub to distfiles

this way i can test if the bootloader works as intended
---
 Makefile   | 14 +++++---------
 rdos86.asm | 14 ++++++++++++++
 2 files changed, 19 insertions(+), 9 deletions(-)
 create mode 100644 rdos86.asm

diff --git a/Makefile b/Makefile
index d7a2852..43c79e6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 FLOPPY = 360
 
 PROGRAMS = hello.com
-DISTFILES = $(PROGRAMS)
+DISTFILES = $(PROGRAMS) rdos86.bs
 ROMS =
 
 QEMU_ARCH = $(shell uname -m)
@@ -47,12 +47,6 @@ vga11.com: cp437.bin
 # Bootloaders, first sector on partition
 %.bs: %.asm
 	$(NASM) $(NASM_ARGS) -DBASE=0x7C00 -DBOOT -o $@ $<
-	: check boot signature
-	test "$$(echo $$(xxd -p -l 2 -s 510 $@))" == 55aa
-
-# Network bootstrap protocol as used for PXE
-%.0: %.asm
-	$(NASM) $(NASM_ARGS) -DBASE=0x7C00 -DNBP -o $@ $<
 
 # BIOS option roms
 %.rom: rom/%.asm utils/fix-rom
@@ -65,9 +59,11 @@ fdimage.img: fat.bs $(DISTFILES)
 hdimage.img: mbr.bs fdimage.img
 	cat mbr.bs fdimage.img >$@
 
-part.img: fat32.bs
+part.img: fat32.bs $(DISTFILES)
 	dd if=/dev/zero bs=1024 count=33k of=$@
-	mformat -F -i part.img -B fat32.bs ::
+	mformat -i $@ -F -B fat32.bs ::
+	mmd -i $@ ::rdos
+	mcopy -i $@ $(DISTFILES) ::rdos
 
 clean:
 	rm -f *.com *.bs *.0 *.lst *.img *.bin *.rom
diff --git a/rdos86.asm b/rdos86.asm
new file mode 100644
index 0000000..06488fa
--- /dev/null
+++ b/rdos86.asm
@@ -0,0 +1,14 @@
+org 0x7C00
+
+main:	mov si, msg
+	mov ah, 0x0e
+	xor bx, bx
+loop:	lodsb
+	test al, al
+	jz end
+	int 0x10
+	jmp loop
+end:	hlt
+	jmp end
+
+msg:	db "rdos kernel stub", 0x0A, 0x0D, 0