Initial checkin for supermicro p4dc6

This also includes a bunch of my pending work including
- Updated serial code so we can compile in different serial port speeds
- Updates to the build system so that:
  - Makefile.settings holds all of the settings of the config variables
  - ldoptions and cpuflags are generated automatically with perl scripts
  - src/config/Config holds all of the architecture neutral make file settings
- Initial work on the P4 including how to use cache as ram
- Update to the ioapic code for the P4 because it delivers irqs on the system
  bus instead of an out of band bus
- Updated version of printf that doesn't need an intermediate buffer
  - logbuf_subr now handles the case when we want to use a log buffer
- video_subr handles the preliminary code for writing to a video device.
- Pending changes for the L440GX are merged in as well (hopefully I haven't
  messed then up since they were written).

src/config/Config

@@ -0,0 +1,47 @@
+## This is Architecture independant part of the makefile
+
+makedefine CC:=gcc 
+makedefine CPP:= gcc -x assembler-with-cpp -DASSEMBLY -E
+makedefine LIBGCC_FILE_NAME := $(shell $(CC) -print-libgcc-file-name)
+makedefine GCC_INC_DIR := $(shell $(CC) -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp")
+
+makedefine CPPFLAGS := -I$(TOP)/src/include -I$(TOP)/src/arch/$(ARCH)/include -I$(GCC_INC_DIR) $(CPUFLAGS)
+makedefine CFLAGS := $(CPU_OPT) $(CPPFLAGS) -Os -nostdinc -nostdlib -fno-builtin  -Wall
+
+makerule ldscript.ld : ldoptions $(LDSUBSCRIPTS-1) ; echo "INCLUDE ldoptions" > $@ ; for file in $(LDSUBSCRIPTS-1) ; do echo "INCLUDE $$file" >> $@ ; done
+
+makerule cpuflags : Makefile.settings ; perl -e 'print "CPUFLAGS :=\n"; foreach $$var (split(" ", $$ENV{VARIABLES})) { if (exists($$ENV{$$var})) { print "CPUFLAGS += -D$$var" . (length($$ENV{$$var})?"=\x27$$ENV{$$var}\x27":"") ."\n"} else { print "CPUFLAGS += -U$$var\n"} }' > $@
+
+makerule ldoptions : Makefile.settings ; perl -e 'foreach $$var (split(" ", $$ENV{VARIABLES})) { if ($$ENV{$$var} =~ m/^(0x[0-9a-fA-F]+|0[0-7]+|[0-9]+)$$/) { print "$$var = $$ENV{$$var};\n"; }}' > $@
+
+makerule linuxbios.strip: linuxbios ; objcopy -O binary linuxbios linuxbios.strip
+
+makerule linuxbios.o : crt0.o linuxbios.a $(LIBGCC_FILE_NAME)  ; $(CC) -nostdlib -r -o $@ crt0.o linuxbios.a $(LIBGCC_FILE_NAME)
+
+
+makerule linuxbios: linuxbios.o ldscript.ld ; $(CC) -nostdlib -nostartfiles -static -o $@ -T ldscript.ld linuxbios.o 
+addaction linuxbios nm -n linuxbios > linuxbios.map
+
+makerule linuxbios.a : $(OBJECTS-1) ; rm -f linuxbios.a
+addaction linuxbios.a ar cr linuxbios.a $(OBJECTS-1)
+
+makerule crt0.s: crt0.S ; $(CPP) $(CPPFLAGS) -I$(TOP)/src $< > crt0.s
+
+makerule crt0.o : crt0.s; $(CC) $(CPU_OPT) -c crt0.s
+
+makerule etags: $(SOURCES) ; etags $(SOURCES)
+makerule tags: $(SOURCES) ; ctags $(SOURCES)
+makerule documentation: $(SOURCES) ; doxygen LinuxBIOSDoc.config 
+
+makerule clean : ; rm -f linuxbios.* *~
+addaction clean rm -f linuxbios 
+addaction clean rm -f ldoptions cpuflags ldscript.ld
+addaction clean rm -f a.out *.s *.l *.o
+addaction clean rm -f TAGS tags
+addaction clean rm -f docipl
+
+# do standard config files that the user need not specify
+# for now, this is just 'lib', but it may be more later. 
+dir /src/lib
+dir /src/boot
+dir /src/rom