rom: Switch to TARGET=iop

The EE side of the code has been moved to a library at rom/ee.

The rom/ tree now simply builds the rom entrypoint, and will link to
both libraries, allowing them to be seperate and manages.

The buildsystem has now been greatly refactored, and IOP support kind of
exists now? Only kind of, I haven't really tested if it works yet

Makefile

@@ -1,4 +1,4 @@
-.PHONY: all clean
+.PHONY: all copy clean
 
 TOP=$(shell pwd)
 
@@ -8,7 +8,16 @@ CONFIG=release
 endif
 
 all:
+	make -C rom/ee TOP=$(TOP) CONFIG=$(CONFIG)
 	make -C rom TOP=$(TOP) CONFIG=$(CONFIG)
 
 clean:
+	make -C rom/ee TOP=$(TOP) CONFIG=$(CONFIG) clean
 	make -C rom TOP=$(TOP) CONFIG=$(CONFIG) clean
+
+# copy to PCSX2 BIOS root
+# NOTE: You will have to manually edit the PCSX2 ini file,
+# since our ROM file does not have anything resembling a
+# ROMDIR (and the BIOS selection menu only shows ROMs with a ROMDIR)
+copy:
+	cp bin/ps2rom_$(CONFIG).rom ~/.config/PCSX2/bios

README.md

@@ -0,0 +1,13 @@
+# ps2rom
+
+A bare-metal "template"? for the PS2. This essentially builds a replacement BIOS for both the EE and IOP.
+
+No EE kernel, or IOP RTOS is loaded in this state. It's up to you to write the code to initalize either side of the system.
+
+# Building
+
+PS2SDK should be enough. (in theory, only ps2toolchain is actually needed, but I don't think there's a really good way to get that on its own)
+
+`make CONFIG=[release|debug]` builds each flavor of the ROM.
+
+There are some linker warnings currently, but they are fine to ignore.

build/core.mk

@@ -23,14 +23,14 @@ BINDIR = $(TOP)/bin
 OBJDIR = obj/$(CONFIG)
 
 
-# include target-specific recipies specifying how to 
-# build for the target.
-include $(TOP)/build/$(TARGET)-common.mk
-#include $(TOP)/build/$(TARGET)-$(KIND).mk
-
 FINALNAME=$(NAME)_$(CONFIG)
 
 OBJECTS := $(patsubst %.c,obj/$(CONFIG)/%.o,$(filter %.c,$(SRCS)))
 OBJECTS += $(patsubst %.cpp,obj/$(CONFIG)/%.o,$(filter %.cpp,$(SRCS)))
 OBJECTS += $(patsubst %.s,obj/$(CONFIG)/%.o,$(filter %.s,$(SRCS)))
 
+# include target-specific recipies specifying how to 
+# build for the target.
+include $(TOP)/build/targets/$(TARGET).mk
+
+

build/ee-bin.mk

@@ -1,12 +0,0 @@
-FINALNAME=$(NAME)_$(CONFIG)
-
-OBJECTS := $(patsubst %.c,obj/$(CONFIG)/%.o,$(filter %.c,$(SRCS)))
-OBJECTS += $(patsubst %.cpp,obj/$(CONFIG)/%.o,$(filter %.cpp,$(SRCS)))
-OBJECTS += $(patsubst %.s,obj/$(CONFIG)/%.o,$(filter %.s,$(SRCS)))
-
-$(BINDIR)/$(FINALNAME).elf: $(OBJDIR)/ $(BINDIR)/ $(OBJECTS)
-	$(LD)  $(LDFLAGS) $(LIBS) $(OBJECTS)   -o $@
-
-clean-products:
-	-rm $(BINDIR)/$(FINALNAME).elf
-	-rm -rf obj

build/ee-common.mk

@@ -1,36 +0,0 @@
-# common EE toolchain stuff
-
-# EE toolchain root.
-EE_TRIPLET=mips64r5900el-ps2-elf
-
-CC=$(EE_TRIPLET)-gcc
-AS=$(CC) -mabi=32 -march=r3000 #HACK
-CXX=$(EE_TRIPLET)-g++
-#LD=$(CC)
-LD=mipsel-ps2-irx-gcc # HACK
-AR=$(EE_TRIPLET)-ar
-OBJCOPY=$(EE_TRIPLET)-objcopy
-
-ifeq ($(CONFIG),release)
-CFLAGS := $(CFLAGS) -G0 -O3 -Wall -Wextra -Werror -fno-common -fno-strict-aliasing
-ASFLAGS := -xassembler-with-cpp
-endif
-
-ifeq ($(CONFIG),debug)
-CFLAGS := $(CFLAGS) -G0 -O0 -g3 -Wall -Wextra -fno-common -fno-strict-aliasing
-ASFLAGS := -xassembler-with-cpp -g3
-endif
-
-CXXFLAGS := $(CXXFLAGS) $(CFLAGS)
-
-# compile rules
-$(OBJDIR)/%.o: %.c
-	$(CC) -c $(CFLAGS) $< -o $@
-
-$(OBJDIR)/%.o: %.cpp
-	$(CXX) -c $(CXXFLAGS) $< -o $@
-
-$(OBJDIR)/%.o: %.s
-	$(AS) -c $(ASFLAGS) $< -o $@
-
-

build/ee-lib.mk

@@ -1,12 +0,0 @@
-FINALNAME=$(NAME)_$(CONFIG)
-
-OBJECTS := $(patsubst %.c,obj/$(CONFIG)/%.o,$(filter %.c,$(SRCS)))
-OBJECTS += $(patsubst %.cpp,obj/$(CONFIG)/%.o,$(filter %.cpp,$(SRCS)))
-OBJECTS += $(patsubst %.s,obj/$(CONFIG)/%.o,$(filter %.s,$(SRCS)))
-
-clean-products:
-	-rm $(BINDIR)/lib$(FINALNAME).a
-	-rm -rf obj
-
-$(BINDIR)/lib$(FINALNAME).a: $(OBJDIR)/ $(BINDIR)/ $(OBJECTS)
-	$(AR) rv $@ $(OBJECTS)

build/products/bin.mk

@@ -0,0 +1,7 @@
+$(BINDIR)/$(FINALNAME).elf: $(OBJDIR)/ $(BINDIR)/ $(OBJECTS)
+	$(LD)  $(LDFLAGS) $(OBJECTS) $(LIBS) -o $@
+
+clean-products:
+	-rm $(BINDIR)/$(FINALNAME).elf
+	-rm $(BINDIR)/$(FINALNAME).map
+	-rm -rf obj

build/products/lib.mk

@@ -0,0 +1,8 @@
+
+$(BINDIR)/lib$(FINALNAME).a: $(OBJDIR)/ $(BINDIR)/ $(OBJECTS)
+	$(AR) rv $@ $(OBJECTS)
+
+
+clean-products:
+	-rm $(BINDIR)/lib$(FINALNAME).a
+	-rm -rf obj

build/targets/ee.mk

@@ -0,0 +1,41 @@
+# common EE toolchain stuff
+
+# EE toolchain root.
+EE_TRIPLET=mips64r5900el-ps2-elf
+
+CC=$(EE_TRIPLET)-gcc
+AS=$(CC)
+CXX=$(EE_TRIPLET)-g++
+
+# we need to use this to link, because
+# we target the 32bit ABI, which the
+# EE linker really doesn't like.
+# It seems like a hack, probably because it is.
+LD=mipsel-ps2-irx-gcc
+AR=$(EE_TRIPLET)-ar
+OBJCOPY=$(EE_TRIPLET)-objcopy
+
+ifeq ($(CONFIG),release)
+CFLAGS := $(CFLAGS) -mabi=32 -G0 -O3 -Wall -Wextra -Werror -fno-common -fno-strict-aliasing
+ASFLAGS := -mabi=32 -xassembler-with-cpp $(ASFLAGS)
+LDFLAGS := -s $(LDFLAGS)
+endif
+
+ifeq ($(CONFIG),debug)
+CFLAGS := $(CFLAGS) -mabi=32 -G0 -O0 -g3 -Wall -Wextra -fno-common -fno-strict-aliasing
+ASFLAGS := -mabi=32 -xassembler-with-cpp -g3 $(ASFLAGS)
+endif
+
+CXXFLAGS := $(CXXFLAGS) $(CFLAGS)
+
+# compile rules
+$(OBJDIR)/%.o: %.c
+	$(CC) -c $(CFLAGS) $< -o $@
+
+$(OBJDIR)/%.o: %.cpp
+	$(CXX) -c $(CXXFLAGS) $< -o $@
+
+$(OBJDIR)/%.o: %.s
+	$(AS) -c $(ASFLAGS) $< -o $@
+
+

build/targets/iop.mk

@@ -0,0 +1,35 @@
+# common IOP toolchain stuff
+
+# EE toolchain root.
+IOP_TRIPLET=mipsel-ps2-irx
+
+CC=$(IOP_TRIPLET)-gcc
+AS=$(CC)
+CXX=$(IOP_TRIPLET)-g++
+LD=$(CC)
+AR=$(IOP_TRIPLET)-ar
+OBJCOPY=$(IOP_TRIPLET)-objcopy
+
+ifeq ($(CONFIG),release)
+CFLAGS := $(CFLAGS) -msoft-float -G0 -O3 -Wall -Wextra -Werror -fno-common -fno-strict-aliasing
+ASFLAGS := -EL -xassembler-with-cpp
+endif
+
+ifeq ($(CONFIG),debug)
+CFLAGS := $(CFLAGS) -msoft-float -G0 -O0 -g3 -Wall -Wextra -fno-common -fno-strict-aliasing
+ASFLAGS := -EL -xassembler-with-cpp -g3
+endif
+
+CXXFLAGS := $(CXXFLAGS) $(CFLAGS)
+
+# compile rules
+$(OBJDIR)/%.o: %.c
+	$(CC) -c $(CFLAGS) $< -o $@
+
+$(OBJDIR)/%.o: %.cpp
+	$(CXX) -c $(CXXFLAGS) $< -o $@
+
+$(OBJDIR)/%.o: %.s
+	$(AS) -c $(ASFLAGS) $< -o $@
+
+

rom/Makefile

@@ -1,44 +1,39 @@
 NAME=ps2rom
-TARGET=ee
+TARGET=iop
 KIND=bin
 
 SELF=$(shell pwd)
-INCS = -I$(TOP)/src
+INCS = -I$(TOP)/rom
 
-CFLAGS = -ffreestanding -fno-stack-protector -mabi=32
+CFLAGS = -ffreestanding -fno-stack-protector
 CXXFLAGS = -fno-exceptions -fno-rtti
-LDFLAGS = -nostartfiles -nodefaultlibs -Wl,-Map,$(BINDIR)/$(FINALNAME).map -T$(SELF)/link.ld
+LDFLAGS = -nostartfiles -nodefaultlibs -Wl,-Map,$(BINDIR)/$(FINALNAME).map -T$(SELF)/link.ld -L$(BINDIR)
+
+# Link to each portion of the ROM codebase. For now,
+# this will only link to the EE ROM codebase.
+LIBS=-lps2rom_ee_$(CONFIG)
 
 # sources
-SRCS = start.s \
-       ee_start.c
+SRCS = rom_start.s
 
-
-.PHONY: all clean clean-products
 include $(TOP)/build/core.mk
 
 
-all: $(BINDIR)/$(FINALNAME).rom
+.PHONY: all clean clean-products
 
 
+all: $(BINDIR)/$(FINALNAME).rom
+
 $(BINDIR)/:
 	mkdir -p $@
 
 $(OBJDIR)/:
 	mkdir -p $@
 
-
-clean-products:
-	-rm $(BINDIR)/$(FINALNAME).elf
-	-rm -rf obj
+$(BINDIR)/$(FINALNAME).rom: $(BINDIR)/$(FINALNAME).elf
+	$(OBJCOPY) -O binary $< $@
 
 clean: clean-products
 	-rm $(BINDIR)/$(FINALNAME).rom
 
-
-$(BINDIR)/$(FINALNAME).rom: $(BINDIR)/$(FINALNAME).elf
-	$(OBJCOPY) -O binary $< $@
-
-$(BINDIR)/$(FINALNAME).elf: $(OBJDIR)/ $(BINDIR)/ $(OBJECTS)
-	$(LD) $(LDFLAGS) $(LIBS) $(OBJECTS)   -o $@
-
+include $(TOP)/build/products/$(KIND).mk

rom/ee/Makefile

@@ -0,0 +1,28 @@
+NAME=ps2rom_ee
+TARGET=ee
+KIND=lib
+
+INCS = -I$(TOP)/rom
+
+CFLAGS = -ffreestanding -fno-stack-protector
+CXXFLAGS = -fno-exceptions -fno-rtti
+
+# sources
+SRCS = _ee_start.s \
+	ee_start.c
+
+.PHONY: all clean clean-products
+
+include $(TOP)/build/core.mk
+
+all: $(BINDIR)/lib$(FINALNAME).a
+
+$(BINDIR)/:
+	mkdir -p $@
+
+$(OBJDIR)/:
+	mkdir -p $@
+
+clean: clean-products
+
+include $(TOP)/build/products/$(KIND).mk

rom/ee/_ee_start.s

@@ -0,0 +1,9 @@
+.set noat
+.globl _ee_start
+.extern ee_start
+
+// __noreturn __naked void _ee_start()
+// This is the primary entrypoint for the EE code
+_ee_start:
+	li $sp, 0x80010000	// temporary stack
+	j ee_start

rom/ee/ee_start.c

@@ -6,19 +6,11 @@ static void putc(char c) {
 }
 
 static void puts(const char* s) {
-	while (*s != 0) {
+	while (*s)
 		putc(*s++);
-	}
 }
 
-
 __noreturn void _ee_start() {
-    puts("Hello World from Riri~ (EE)\n");
+    puts("EE: Hello World from Lily~\n");
     while(1);
 }
-
-__asm__ (
-	".global ee_start\n"
-	"ee_start:\n"
-	"li	$sp, 0x80010000\n"
-	"j     _ee_start\n");

rom/rom_start.s

@@ -0,0 +1,25 @@
+// This is the entry point of the ROM.
+// It is limited to 32-bit MIPS-I code,
+// because it runs on both the EE and the IOP.
+//
+// The task of this relatively short bit of code
+// is to start the approiate part of the ROM
+// on the correct processor.
+//
+// It's a bit creative, but also a bit annoying.
+.org 0
+.set noat
+
+// externs
+.extern _ee_start
+
+.globl _start
+_start:
+	mfc0 $at, $15		// load the PRID
+	sltiu $at, 0x59		// Check for EE PRID
+	bne $15, 0, __iop	// Branch if not EE
+	nop
+	j _ee_start			// Call EE start routine
+	nop
+__iop:					// for now the iop stalls.
+	j __iop

rom/start.s

@@ -1,16 +0,0 @@
-.org 0
-.set noat
-
-// externs
-.extern ee_start
-
-.globl _start
-_start:
-    mfc0 $at, $15  // load PRID
-    sltiu $at, 0x59
-    bne $15, 0, __iop
-    nop
-    j ee_start
-    nop
-__iop:             // for now iop stalls.
-    j __iop