can read character from keyboard now

biosboot/Makefile

@@ -1,18 +1,20 @@
-include ../*.inc
+SDIR ?= ../
+BDIR ?= ./
 
-PROG=biosboot
-SRCS=$(wildcard *.S)
-OBJS=$(SRCS:.S=.o)
+PROG = biosboot
+SRCS = biosboot.S
+OBJS = biosboot.o
 
-CFLAGS+=-c -fno-pie
-LDFLAGS+=-Ttext 0 -T ld.script
-CPPFLAGS+=-nostdinc -DLOADADDR=$(LOADADDR) -DLINKADDR=$(LINKADDR) -DBOOTMAGIC=$(BOOTMAGIC)
-CPPFLAGS+=-I $(IDIR)
+include $(SDIR)/Makefile.inc
+
+CFLAGS += -c -fno-pie
+LDFLAGS += -Ttext 0 -T ld.script
+CPPFLAGS += -DLOADADDR=$(LOADADDR) -DLINKADDR=$(LINKADDR) -DBOOTMAGIC=$(BOOTMAGIC) -DBOOTSEG=$(BOOTSEG)
 
 $(PROG): $(OBJS)
 	$(LD) $(LDFLAGS) -o $(BDIR)/$(PROG) $(OBJS)
 
-$(OBJS): ../def.h
+$(OBJS): $(SDIR)/Makefile.inc
 
 clean:
 	rm -f $(PROG) $(OBJS)