Added Source Code

Makefile

@@ -0,0 +1,68 @@
+ifdef $(GENDEV)
+ROOTDIR = $(GENDEV)
+else
+ROOTDIR = /opt/toolchains/sega
+endif
+
+LDSCRIPTSDIR = $(ROOTDIR)/ldscripts
+
+BOOTBLOCKDIR = $(ROOTDIR)/bootblocks
+#BOOTBLOCK = $(BOOTBLOCKDIR)/US_BOOT.BIN
+BOOTBLOCK = $(BOOTBLOCKDIR)/EU_BOOT.BIN
+#BOOTBLOCK = $(BOOTBLOCKDIR)/JP_BOOT.BIN
+
+LIBPATH = -L$(ROOTDIR)/m68k-elf/lib -L$(ROOTDIR)/m68k-elf/lib/gcc/m68k-elf/4.6.2 -L$(ROOTDIR)/m68k-elf/m68k-elf/lib
+INCPATH = -I. -I../include -I$(ROOTDIR)/m68k-elf/include -I$(ROOTDIR)/m68k-elf/m68k-elf/include
+
+CCFLAGS = -m68000 -Wall -O1 -c -fomit-frame-pointer
+HWFLAGS = -m68000 -Wall -O1 -c -fomit-frame-pointer
+LDFLAGS = -T $(LDSCRIPTSDIR)/cd.ld -Wl,-Map=output.map -nostdlib
+ASFLAGS = -m68000 --register-prefix-optional
+
+PREFIX = $(ROOTDIR)/m68k-elf/bin/m68k-elf-
+CC = $(PREFIX)gcc
+AS = $(PREFIX)as
+LD = $(PREFIX)ld
+OBJC = $(PREFIX)objcopy
+
+ASMZ80 = $(ROOTDIR)/bin/zasm
+FLAGSZ80 = -vb2
+
+DD = dd
+RM = rm -rf
+
+TARGET = CDModPlayer
+LIBS = $(LIBPATH) -lpcm -lc -lgcc -lnosys
+OBJS = crt0.o main.o module.o cdfh.o hw_md.o
+FILES =
+
+all: $(TARGET).bin
+
+$(TARGET).bin: $(TARGET).elf
+	$(OBJC) -O binary $< temp.bin
+	$(DD) if=temp.bin of=$@ bs=2048 conv=sync
+
+$(TARGET).elf: $(OBJS) $(FILES)
+	$(CC) $(LDFLAGS) $(OBJS) $(LIBS) $(FILES) -o $(TARGET).elf
+
+%.o80: %.s80
+	$(ASMZ80) $(FLAGSZ80) -o $@ $<
+
+module.o: module.c
+	$(CC) $(HWFLAGS) -DPROC_PATTERNS $(INCPATH) $< -o $@
+
+%.o: %.c
+	$(CC) $(CCFLAGS) $(INCPATH) $< -o $@
+
+%.o: %.s
+	$(AS) $(ASFLAGS) $(INCPATH) $< -o $@
+
+cd: $(TARGET).bin
+	mkdir -p cd
+	mkdir -p cd/MODs
+	cp $(TARGET).bin cd/APP.BIN
+	cp -r MODs/* cd/MODs/
+	genisoimage -sysid "SEGA SEGACD" -volid "CDMODPLAYER" -generic-boot $(BOOTBLOCK) -full-iso9660-filenames -o $(TARGET).iso cd
+
+clean:
+	$(RM) *.o *.o80 *.bin *.elf *.map *.log *.iso cd

cdfh.c

@@ -0,0 +1,199 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "hw_md.h"
+#include "cdfh.h"
+
+//----------------------------------------------------------------------
+// SegaCD File Handler - by Chilly Willy
+//   Inspired by the MikMod READER structure.
+//----------------------------------------------------------------------
+
+static uint8_t cd_Eof(CDFileHandle_t *handle)
+{
+    if (!handle)
+        return 1;
+
+    if (handle->pos >= handle->length)
+        return 1;
+
+    return 0;
+}
+
+static int32_t cd_Read(CDFileHandle_t *handle, void *ptr, int32_t size)
+{
+    int32_t pos, blk, len, read = 0;
+    uint8_t *dst = ptr;
+
+    if (!handle)
+        return 0;
+
+    while (size != 0)
+    {
+        if (handle->Eof(handle))
+            return read;
+
+        pos = handle->pos;
+        blk = (pos >> 11) + handle->offset;
+        if (handle->block != blk)
+        {
+            read_cd(blk, 1, (void *)0x6800);
+            handle->block = blk;
+        }
+
+        len = 0x800 - (pos & 0x7FF);
+        if (len > size)
+            len = size;
+        if (len > (handle->length - pos))
+            len = (handle->length - pos);
+
+        memcpy(dst, (char *)0x6800 + (pos & 0x7FF), len);
+
+        handle->pos += len;
+        dst += len;
+        read += len;
+        size -= len;
+    }
+
+    return read;
+}
+
+static uint8_t cd_Get(CDFileHandle_t *handle)
+{
+    int32_t pos, blk;
+
+    if (handle->Eof(handle))
+        return 0;
+
+    pos = handle->pos;
+    blk = (pos >> 11) + handle->offset;
+    if (handle->block != blk)
+    {
+        read_cd(blk, 1, (void *)0x6800);
+        handle->block = blk;
+    }
+
+    handle->pos++;
+    return ((uint8_t*)0x6800)[pos & 0x7FF];
+}
+
+static int32_t cd_Seek(CDFileHandle_t *handle, int32_t offset, int32_t whence)
+{
+    int32_t pos;
+
+    if (!handle)
+        return -1;
+
+    pos = handle->pos;
+    switch(whence)
+    {
+        case SEEK_CUR:
+            pos += offset;
+            break;
+        case SEEK_SET:
+            pos = offset;
+            break;
+        case SEEK_END:
+            pos = handle->length - offset - 1;
+            break;
+    }
+    if (pos < 0)
+        handle->pos = 0;
+    else if (pos > handle->length)
+        handle->pos = handle->length;
+    else
+        handle->pos = pos;
+
+    return handle->pos;
+}
+
+static int32_t cd_Tell(CDFileHandle_t *handle)
+{
+    return handle ? handle->pos : 0;
+}
+
+
+CDFileHandle_t *cd_handle_from_offset(int32_t offset, int32_t length)
+{
+    CDFileHandle_t *handle = (CDFileHandle_t*)malloc(sizeof(CDFileHandle_t));
+    if (handle)
+    {
+        handle->Eof  = &cd_Eof;
+        handle->Read = &cd_Read;
+        handle->Get  = &cd_Get;
+        handle->Seek = &cd_Seek;
+        handle->Tell = &cd_Tell;
+        handle->offset = offset;
+        handle->length = length;
+        handle->block = -1; // nothing read yet
+        handle->pos = 0;
+    }
+    return handle;
+}
+
+CDFileHandle_t *cd_handle_from_name(char *name)
+{
+    int32_t i;
+    char temp[256];
+
+    CDFileHandle_t *handle = (CDFileHandle_t*)malloc(sizeof(CDFileHandle_t));
+    if (handle)
+    {
+        handle->Eof  = &cd_Eof;
+        handle->Read = &cd_Read;
+        handle->Get  = &cd_Get;
+        handle->Seek = &cd_Seek;
+        handle->Tell = &cd_Tell;
+
+        i = strlen(name);
+        while (i && (name[i] != '/'))
+            i--;
+        if (name[i] == '/')
+        {
+            if (i)
+            {
+                strncpy(temp, name, i);
+                temp[i] = 0;
+            }
+            else
+            {
+                strcpy(temp, "/");
+            }
+            if (set_cwd(temp) < 0)
+            {
+                // error setting working directory
+                free(handle);
+                return NULL;
+            }
+            strncpy(temp, &name[i+1], 255);
+            temp[255] = 0;
+        }
+        else
+        {
+            strncpy(temp, name, 255);
+            temp[255] = 0;
+        }
+
+        if (find_dir_entry(temp) < 0)
+        {
+            // error finding entry
+            free(handle);
+            return NULL;
+        }
+
+        handle->offset = global_vars->DENTRY_OFFSET;
+        handle->length = global_vars->DENTRY_LENGTH;
+        handle->block = -1; // nothing read yet
+        handle->pos = 0;
+    }
+    return handle;
+}
+
+void delete_cd_handle(CDFileHandle_t *handle)
+{
+    if (handle)
+        free(handle);
+}
+

cdfh.h

@@ -0,0 +1,30 @@
+#ifndef _CDFH_H
+#define _CDFH_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct CDFileHandle {
+    int32_t  (*Seek)(struct CDFileHandle *handle, int32_t offset, int32_t whence);
+    int32_t  (*Tell)(struct CDFileHandle *handle);
+    int32_t  (*Read)(struct CDFileHandle *handle, void *ptr, int32_t size);
+    uint8_t  (*Get)(struct CDFileHandle *handle);
+    uint8_t  (*Eof)(struct CDFileHandle *handle);
+    int32_t  offset; // start block of file
+    int32_t  length; // length of file
+    int32_t  block; // current block in buffer
+    int32_t  pos; // current position in file
+} CDFileHandle_t;
+
+extern CDFileHandle_t *cd_handle_from_name(char *name);
+extern CDFileHandle_t *cd_handle_from_offset(int32_t offset, int32_t length);
+extern void delete_cd_handle(CDFileHandle_t *handle);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

crt0.s

@@ -0,0 +1,45 @@
+| SEGA CD support code
+| by Chilly Willy
+
+        .text
+
+| CD startup at 0x8000
+
+        .global _start
+_start:
+        move    #0x2700,sr              /* disable interrupts */
+
+| Clear BSS
+        lea     __bss_start,a0
+        lea     __bss_end,a1
+        moveq   #0,d0
+1:
+        move.l  d0,(a0)+
+        cmpa.l  a0,a1
+        bhi.b   1b
+
+        move.l  sp,__stack_save         /* save BIOS stack pointer */
+        lea     __stack,a0
+        movea.l a0,sp                   /* set stack pointer to top of Program RAM */
+        link.w  a6,#-8                  /* set up initial stack frame */
+
+        jsr     init_hardware           /* initialize the console hardware */
+
+        jsr     __INIT_SECTION__        /* do all program initializers */
+        jsr     main                    /* call program main() */
+        jsr     __FINI_SECTION__        /* do all program finishers */
+
+        movea.l __stack_save,sp         /* restore BIOS stack pointer */
+        moveq   #0,d0
+        rts
+
+
+        .data
+
+        .align  4
+
+__stack_save:
+        .long   0
+
+        .text
+

files.h

@@ -0,0 +1,5 @@
+#define NUM_FILES 5
+
+extern char *fileName[NUM_FILES];
+extern int fileSize[NUM_FILES];
+extern int filePtr[NUM_FILES];

files.s

@@ -0,0 +1,4 @@
+        .text
+
+        .align  4
+