4 files changed, 38 insertions, 3 deletions
diff --git a/inc/cpu.h b/inc/cpu.h
index 1a9a989..ca85a2f 100644
--- a/inc/cpu.h
+++ b/inc/cpu.h
@@ -3,8 +3,13 @@
 
 #include <stdint.h>
 
-#define ERR 0
-#define OK 1
+#include <err.h>
+
+struct cpu_interface {
+	void (*reg_names)(const char *names, int n);
+	void (*reg_update)(int reg, uint64_t val);
+	void (*instr_done)(char *instr);
+};
 
 enum registers {
 	RAX,
@@ -50,8 +55,13 @@ enum registers {
 	DIH = DIL + 4
 };
 
+err cpu_next(void);
+err cpu_prev(void);
+
 void *cpu_get_reg(uint8_t reg);
 void cpu_set_reg(uint8_t reg, uint64_t val);
+void cpu_register_interface(struct cpu_interface *cpu);
 void cpu_exec(const char *path);
+void cpu_destroy(void);
 
 #endif
diff --git a/inc/err.h b/inc/err.h
new file mode 100644
index 0000000..c1ae3d9
--- /dev/null
+++ b/inc/err.h
@@ -0,0 +1,6 @@
+#ifndef ERR_H
+#define ERR_H
+
+typedef enum { ERR, OK, END } err;
+
+#endif
diff --git a/inc/gui.h b/inc/gui.h
new file mode 100644
index 0000000..e8a583d
--- /dev/null
+++ b/inc/gui.h
@@ -0,0 +1,19 @@
+#ifndef GUI_H
+#define GUI_H
+
+#include <err.h>
+#include <stdint.h>
+
+struct gui_interface {
+	err (*step_next)(void);
+	err (*step_prev)(void);
+};
+
+void gui_reg_names(const char *names, int n);
+void gui_reg_update(int reg, uint64_t value);
+void gui_instr_done(char *instr);
+
+void gui_register_interface(struct gui_interface *gui);
+void gui_init(void);
+
+#endif
diff --git a/inc/mem.h b/inc/mem.h
index e2d7a18..2485aee 100644
--- a/inc/mem.h
+++ b/inc/mem.h
@@ -8,6 +8,6 @@ typedef uint64_t vaddr;
 
 void *mem_alloc(size_t size, vaddr virt);
 void *mem_phys(vaddr virt);
-void mem_free_all(void);
+void mem_destroy(void);
 
 #endif