From 95b658897aa2f9039398bde46649dc3cd5ade4e3 Mon Sep 17 00:00:00 2001
From: Virgil Dupras <hsoft@hardcoded.net>
Date: Mon, 17 Jun 2019 14:17:47 -0400
Subject: [PATCH] recipes/rc2014/zasm: add instructions to assemble kernel

---
 recipes/rc2014/zasm/Makefile  | 14 ++++-------
 recipes/rc2014/zasm/README.md | 44 +++++++++++++++++++++++++++++++++--
 2 files changed, 46 insertions(+), 12 deletions(-)

diff --git a/recipes/rc2014/zasm/Makefile b/recipes/rc2014/zasm/Makefile
index 93b06b6..f5f1942 100644
--- a/recipes/rc2014/zasm/Makefile
+++ b/recipes/rc2014/zasm/Makefile
@@ -1,9 +1,4 @@
-# source files required to build os.bin. We copy them in cfsin so that we can
-# build the same kernel from within the RC2014.
-KERNEL_SRCS = err.h acia.asm blockdev.asm blockdev_cmds.asm core.asm fs.asm \
-	fs_cmds.asm mmap.asm parse.asm pgm.asm sdc.asm shell.asm stdio.asm
-
-CFSTARGETS = $(addprefix cfsin/, zasm sdct at28w user.h $(KERNEL_SRCS))
+CFSTARGETS = $(addprefix cfsin/, zasm sdct memt at28w user.h)
 BASE = ../../..
 TOOLS = $(BASE)/tools
 ZASM = $(TOOLS)/zasm.sh
@@ -29,15 +24,14 @@ cfsin/zasm: $(ZASMBIN)
 cfsin/sdct: $(ZASMBIN)
 	$(ZASM) $(APPS) user.h < $(APPS)/sdct/glue.asm > $@
 
+cfsin/memt: $(ZASMBIN)
+	$(ZASM) $(APPS) user.h < $(APPS)/memt/glue.asm > $@
+
 cfsin/at28w: $(ZASMBIN)
 	$(ZASM) $(APPS) $(KERNEL) user.h < $(APPS)/at28w/glue.asm > $@
 
 cfsin/user.h: user.h
 	cp $< $@
-cfsin/err.h: $(KERNEL)/err.h
-	cp $< $@
-cfsin/%.asm: $(KERNEL)/%.asm
-	cp $< $@
 
 .PHONY: clean
 clean:
diff --git a/recipes/rc2014/zasm/README.md b/recipes/rc2014/zasm/README.md
index 8b22717..205ac2b 100644
--- a/recipes/rc2014/zasm/README.md
+++ b/recipes/rc2014/zasm/README.md
@@ -8,8 +8,6 @@ assembly to binary.
 Have a RC2014 assemble a Collapse OS kernel with its source living on a CFS on
 a SD card.
 
-**Work in progress: for now, we compile a simple hello.asm source file.**
-
 ## Gathering parts
 
 * Same parts as the [SD card recipe](../sdcard).
@@ -59,3 +57,45 @@ Compiling and running `hello.asm` is done very much like in
     >
 
 That RC2014 is starting to feel powerful now, right?
+
+## Test your hardware
+
+Now that you have a fully functional filesystem that can load programs and run
+them easily, you'll see that this recipe's CFS include a couple of programs
+besides `zasm`. Among them, there's `sdct` that stress tests reading and
+writing on the SD card and `memt` that stress tests RAM. You might be
+interested in running them. Look at their description in `apps/`. All you need
+to to do run them is to type their name.
+
+## Assembling the kernel
+
+Now let's go for something a little more fun! Jiu-jitsu? No, you're not going to
+learn jiu-jitsu! You're going to assemble the kernel from within your RC2014!
+
+The makefile doesn't prepare a CFS blob for this, let's learn to build that blob
+yourself. First of all, we'll need to have what we already had in `sdcard.cfs`
+because it has `zasm` and `user.h`. But we're going to add the contents of
+the `/kernel/` directory to it.
+
+    $ cp ../../../kernel/*.{h,asm} cfsin
+
+You'll also need your glue file (at this time, the RC2014 can't assemble the
+kernel of this very recipe, I'm not sure why. It can, however, assemble the
+simpler kernel of the base RC2014 recipe. We'll use this one):
+
+    $ cp ../glue.asm cfsin
+
+You're now ready to re-make your CFS:
+
+    $ rm sdcard.cfs && make
+
+Now you can write this into your card and boot Collapse OS:
+
+    Collapse OS
+    > sdci
+    > fson
+    > fopn 0 glue.asm
+    > fnew 10 dest
+    > fopn 1 dest
+    > zasm 1 2          # This takes a while. About 3 minutes.
+    > sdcf              # success! sdcf flushes SD card buffers to the card.