--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/backend.h	Mon Feb 24 00:50:15 2014 -0800
@@ -0,0 +1,92 @@
+/*
+ Copyright 2013 Michael Pavone
+ This file is part of BlastEm.
+ BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
+*/
+#ifndef BACKEND_H_
+#define BACKEND_H_
+
+#include <stdint.h>
+#include <stdio.h>
+
+#define INVALID_OFFSET 0xFFFFFFFF
+#define EXTENSION_WORD 0xFFFFFFFE
+
+typedef struct {
+	int32_t disp;
+	uint8_t mode;
+	uint8_t base;
+	uint8_t index;
+	uint8_t cycles;
+} x86_ea;
+
+typedef struct {
+	uint8_t  *base;
+	int32_t  *offsets;
+} native_map_slot;
+
+typedef struct deferred_addr {
+	struct deferred_addr *next;
+	uint8_t              *dest;
+	uint32_t             address;
+} deferred_addr;
+
+typedef enum {
+	READ_16,
+	READ_8,
+	WRITE_16,
+	WRITE_8
+} ftype;
+
+typedef struct {
+	uint32_t flags;
+	native_map_slot *native_code_map;
+	deferred_addr   *deferred;
+	uint8_t         *cur_code;
+	uint8_t         *code_end;
+	uint8_t         **ram_inst_sizes;
+	FILE            *address_log;
+	uint8_t			*save_context;
+	uint8_t			*load_context;
+	uint8_t         *handle_cycle_limit;
+	uint8_t         *handle_cycle_limit_int;
+	uint8_t			context_reg;
+	uint8_t			scratch1;
+	uint8_t			scratch2;
+} cpu_options;
+
+
+#define MMAP_READ      0x01
+#define MMAP_WRITE     0x02
+#define MMAP_CODE      0x04
+#define MMAP_PTR_IDX   0x08
+#define MMAP_ONLY_ODD  0x10
+#define MMAP_ONLY_EVEN 0x20
+#define MMAP_FUNC_NULL 0x40
+
+typedef uint16_t (*read_16_fun)(uint32_t address, void * context);
+typedef uint8_t (*read_8_fun)(uint32_t address, void * context);
+typedef void * (*write_16_fun)(uint32_t address, void * context, uint16_t value);
+typedef void * (*write_8_fun)(uint32_t address, void * context, uint8_t value);
+
+typedef struct {
+	uint32_t     start;
+	uint32_t     end;
+	uint32_t     mask;
+	uint16_t     ptr_index;
+	uint16_t     flags;
+	void *       buffer;
+	read_16_fun  read_16;
+	write_16_fun write_16;
+	read_8_fun   read_8;
+	write_8_fun  write_8;
+} memmap_chunk;
+
+typedef uint8_t * (*native_addr_func)(void * context, uint32_t address);
+
+deferred_addr * defer_address(deferred_addr * old_head, uint32_t address, uint8_t *dest);
+void remove_deferred_until(deferred_addr **head_ptr, deferred_addr * remove_to);
+void process_deferred(deferred_addr ** head_ptr, void * context, native_addr_func get_native);
+
+#endif //BACKEND_H_
+