rom: an attempt at IOP stuff

it seems multiple source files for each part break, and I don't quite know why

.clang-format

@@ -0,0 +1,46 @@
+# .clang-format for native code portion
+
+BasedOnStyle: Google
+
+# force T* or T&
+DerivePointerAlignment: false
+PointerAlignment: Left
+
+TabWidth: 4
+IndentWidth: 4
+UseTab: Always
+IndentPPDirectives: BeforeHash
+
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: false
+AllowShortFunctionsOnASingleLine: InlineOnly
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: true
+
+BinPackArguments: true
+BinPackParameters: true
+BreakConstructorInitializers: BeforeColon
+BreakStringLiterals: false
+
+ColumnLimit: 150
+CompactNamespaces: false
+
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ContinuationIndentWidth: 0
+
+# turning this on causes major issues with initializer lists
+Cpp11BracedListStyle: false
+SpaceBeforeCpp11BracedList: true
+
+FixNamespaceComments: true
+
+NamespaceIndentation: All
+ReflowComments: true
+
+SortIncludes: CaseInsensitive
+SortUsingDeclarations: true
+
+SpacesInSquareBrackets: false
+SpaceBeforeParens: Never
+SpacesBeforeTrailingComments: 1

.gitignore

@@ -1,2 +1,4 @@
 bin/
 **/obj
+/.cache
+/compile_commands.json

Makefile

@@ -1,4 +1,4 @@
-.PHONY: all copy clean
+.PHONY: all copy clean bear
 
 TOP=$(shell pwd)
 
@@ -9,10 +9,12 @@ endif
 
 all:
 	make -C rom/ee TOP=$(TOP) CONFIG=$(CONFIG)
+	make -C rom/iop TOP=$(TOP) CONFIG=$(CONFIG)
 	make -C rom TOP=$(TOP) CONFIG=$(CONFIG)
 
 clean:
 	make -C rom/ee TOP=$(TOP) CONFIG=$(CONFIG) clean
+	make -C rom/iop TOP=$(TOP) CONFIG=$(CONFIG) clean
 	make -C rom TOP=$(TOP) CONFIG=$(CONFIG) clean
 
 # copy to PCSX2 BIOS root
@@ -21,3 +23,6 @@ clean:
 # ROMDIR (and the BIOS selection menu only shows ROMs with a ROMDIR)
 copy:
 	cp bin/ps2rom_$(CONFIG).rom ~/.config/PCSX2/bios
+
+bear:
+	bear -- $(MAKE) CONFIG=$(CONFIG)

build/core.mk

@@ -29,6 +29,8 @@ 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)))
 
+CFLAGS := $(CFLAGS) $(INCS)
+
 # include target-specific recipies specifying how to 
 # build for the target.
 include $(TOP)/build/targets/$(TARGET).mk

rom/Makefile

@@ -1,5 +1,5 @@
 NAME=ps2rom
-TARGET=iop
+TARGET=ee
 KIND=bin
 
 SELF=$(shell pwd)
@@ -13,6 +13,8 @@ LDFLAGS = -nostartfiles -nodefaultlibs -Wl,-Map,$(BINDIR)/$(FINALNAME).map -T$(S
 # this will only link to the EE ROM codebase.
 LIBS=-lps2rom_ee_$(CONFIG) 
 
+#-lps2rom_iop_$(CONFIG)
+
 # sources
 SRCS = rom_start.s
 
@@ -30,6 +32,10 @@ $(BINDIR)/:
 $(OBJDIR)/:
 	mkdir -p $@
 
+# make sure to assemble the primary ROM start routine
+# as MIPS-I, so that we don't get into any issues.
+$(OBJDIR)/rom_start.o: AS += -march=r3000
+
 $(BINDIR)/$(FINALNAME).rom: $(BINDIR)/$(FINALNAME).elf
 	$(OBJCOPY) -O binary $< $@
 

rom/ee/Makefile

@@ -9,6 +9,7 @@ CXXFLAGS = -fno-exceptions -fno-rtti
 
 # sources
 SRCS = _ee_start.s \
+	ee_sio.c \
 	ee_start.c
 
 .PHONY: all clean clean-products

rom/ee/ee_sio.c

@@ -0,0 +1,11 @@
+//! EE SIO implementation
+#include <shared/sio.h>
+
+void SIO_putc(char c) {
+	*((char*)0x1000f180) = c;
+}
+
+void SIO_puts(const char* s) {
+	while(*s)
+		SIO_putc(*s++);
+}

rom/ee/ee_start.c

@@ -1,16 +1,8 @@
-
-#define __noreturn __attribute__((noreturn))
-
-static void putc(char c) {
-	*((char*)0x1000f180) = c;
-}
-
-static void puts(const char* s) {
-	while (*s)
-		putc(*s++);
-}
+#include "shared/sio.h"
+#include "shared/attributes.h"
 
 __noreturn void _ee_start() {
-    puts("EE: Hello World from Lily~\n");
-    while(1);
+	SIO_puts("EE: Hello World from Lily~\n");
+	while(1)
+		;
 }

rom/iop/Makefile

@@ -0,0 +1,29 @@
+NAME=ps2rom_iop
+TARGET=iop
+KIND=lib
+
+INCS = -I$(TOP)/rom
+
+CFLAGS = -ffreestanding -fno-stack-protector
+CXXFLAGS = -fno-exceptions -fno-rtti
+
+# sources
+SRCS = _iop_start.s \
+	iop_sio.c \
+	iop_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/iop/_iop_start.s

@@ -0,0 +1,10 @@
+.set noat
+.globl _iop_start
+.extern iop_start
+
+// __noreturn __naked void _iop_start()
+// This is the primary entrypoint for the IOP code
+_iop_start:
+	li $sp, 0x001fffc0	// temporary stack (2<<20-0x40)
+    move $fp, $sp
+	j iop_start

rom/iop/iop_sio.c

@@ -0,0 +1,11 @@
+//! IOP SIO implementation
+#include <shared/sio.h>
+
+void SIO_putc(char c) {
+	*((char*)0x1f80380c) = c;
+}
+
+void SIO_puts(const char* s) {
+	while(*s)
+		SIO_putc(*s++);
+}

rom/iop/iop_start.c

@@ -0,0 +1,24 @@
+#include "shared/attributes.h"
+#include "shared/sio.h"
+
+__noreturn void _iop_start() {
+	// setup iop
+	*(char*)0xbf802070 = 9;
+
+	// Poke around with the cache control registers
+	//
+	*(int*)0xfffe0130 = 0xcc4;
+	*(int*)0xfffe0130 = 0xcc0;
+
+	// it seems like if bit 8 is set here,
+	// then the cache control is set nearly
+	// exactly like the PS1 kernel did
+	if((*(int*)0xbf801450) & 8)
+		*(int*)0xfffe0130 = 0x1e988;
+	else
+		*(int*)0xfffe0130 = 0x1edd8;
+
+	SIO_puts("IOP: Hello World from Lily~\n");
+	while(1)
+		;
+}

rom/link.ld

@@ -1,14 +1,21 @@
 _stack_size = 0x80000;
 _heap_size = 1024*1024*10;
 
+_text_origin = 0xbfc00000;
+
 ENTRY(_start);
 SECTIONS {
-	.text 0xbfc00000 : {
-        _text_origin = .;
-		*start.o /* Always link reset first */
+	. = 0xbfc00000;
+
+	.text : {
+		*rom_start.o /* Always link reset as the first object */
+
+		*(libps2rom_ee_*.a)
+		*(libps2rom_iop_*.a)
 
 		*(.text)
 		*(.rodata)
+		*(.rodata.*)
 	}
 	_text_size = . - _text_origin;
 

rom/rom_start.s

@@ -10,8 +10,9 @@
 .org 0
 .set noat
 
-// externs
+// externs from each piece of the code
 .extern _ee_start
+.extern _iop_start
 
 .globl _start
 _start:
@@ -21,5 +22,7 @@ _start:
 	nop
 	j _ee_start			// Call EE start routine
 	nop
-__iop:					// for now the iop stalls.
+__iop:
 	j __iop
+	//j _iop_start		// Call IOP start routine
+	//nop

rom/shared/attributes.h

@@ -0,0 +1 @@
+#define __noreturn __attribute__((noreturn))

rom/shared/sio.h

@@ -0,0 +1,16 @@
+#ifndef SIO_H
+#define SIO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void SIO_putc(char c);
+
+void SIO_puts(const char* s);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif