From 89bfdd4db183cbe75a3a0c2254ca48a50e37276f Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Tue, 11 Jan 2011 13:27:45 -0500
Subject: multiboot support and memory-only (no disk) kernel

---
 Makefile | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index 95247ff..980543a 100644
--- a/Makefile
+++ b/Makefile
@@ -82,6 +82,11 @@ xv6.img: bootblock kernel fs.img
 	dd if=bootblock of=xv6.img conv=notrunc
 	dd if=kernel of=xv6.img seek=1 conv=notrunc
 
+xv6memfs.img: bootblock kernelmemfs
+	dd if=/dev/zero of=xv6memfs.img count=10000
+	dd if=bootblock of=xv6memfs.img conv=notrunc
+	dd if=kernelmemfs of=xv6memfs.img seek=1 conv=notrunc
+
 bootblock: bootasm.S bootmain.c
 	$(CC) $(CFLAGS) -fno-pic -O -nostdinc -I. -c bootmain.c
 	$(CC) $(CFLAGS) -fno-pic -nostdinc -I. -c bootasm.S
@@ -102,11 +107,23 @@ initcode: initcode.S
 	$(OBJCOPY) -S -O binary initcode.out initcode
 	$(OBJDUMP) -S initcode.o > initcode.asm
 
-kernel: $(OBJS) bootother initcode
-	$(LD) $(LDFLAGS) -Ttext 0x100000 -e main -o kernel $(OBJS) -b binary initcode bootother
+kernel: $(OBJS) multiboot.o bootother initcode
+	$(LD) $(LDFLAGS) -Ttext 0x100000 -e main -o kernel multiboot.o $(OBJS) -b binary initcode bootother fs.img
 	$(OBJDUMP) -S kernel > kernel.asm
 	$(OBJDUMP) -t kernel | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
 
+# kernelmemfs is a copy of kernel that maintains the
+# disk image in memory instead of writing to a disk.
+# This is not so useful for testing persistent storage or
+# exploring disk buffering implementations, but it is
+# great for testing the kernel on real hardware without
+# needing a scratch disk.
+MEMFSOBJS = $(filter-out ide.o,$(OBJS)) memide.o
+kernelmemfs: $(MEMFSOBJS) multiboot.o bootother initcode fs.img
+	$(LD) $(LDFLAGS) -Ttext 0x100000 -e main -o kernelmemfs multiboot.o $(MEMFSOBJS) -b binary initcode bootother fs.img
+	$(OBJDUMP) -S kernelmemfs > kernelmemfs.asm
+	$(OBJDUMP) -t kernelmemfs | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernelmemfs.sym
+
 tags: $(OBJS) bootother.S _init
 	etags *.S *.c
 
@@ -187,6 +204,9 @@ QEMUOPTS = -hdb fs.img xv6.img -smp $(CPUS)
 qemu: fs.img xv6.img
 	$(QEMU) -serial mon:stdio $(QEMUOPTS)
 
+qemu-memfs: xv6memfs.img
+	$(QEMU) xv6memfs.img -smp $(CPUS)
+
 qemu-nox: fs.img xv6.img
 	$(QEMU) -nographic $(QEMUOPTS)
 
-- 
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