1 files changed, 41 insertions, 0 deletions
diff --git a/util/alevt/cache.h b/util/alevt/cache.h
new file mode 100644
index 0000000..934ef9a
--- /dev/null
+++ b/util/alevt/cache.h
@@ -0,0 +1,41 @@
+#ifndef CACHE_H
+#define CACHE_H
+
+#include "vt.h"
+#include "misc.h"
+#include "dllist.h"
+
+#define HASH_SIZE 113
+
+
+struct cache
+{
+    struct dl_head hash[HASH_SIZE];
+    int erc; // error reduction circuit on
+    int npages;
+    u16 hi_subno[0x9ff + 1]; // 0:pg not in cache, 1-3f80:highest subno + 1
+    struct cache_ops *op;
+};
+
+
+struct cache_page
+{
+    struct dl_node node[1];
+    struct vt_page page[1];
+};
+
+
+struct cache_ops
+{
+    void (*close)(struct cache *ca);
+    struct vt_page *(*get)(struct cache *ca, int pgno, int subno);
+    struct vt_page *(*put)(struct cache *ca, struct vt_page *vtp);
+    void (*reset)(struct cache *ca);
+    struct vt_page *(*foreach_pg)(struct cache *ca, int pgno, int subno, int dir,
+    int (*func)(), void *data);
+    int (*mode)(struct cache *ca, int mode, int arg);
+};
+
+struct cache *cache_open(void);
+#define CACHE_MODE_ERC 1
+#endif