break dcache code out of remote-bug.c

gdb/dcache.h

@@ -0,0 +1,67 @@
+/* Declarations for caching.  Typically used by remote back ends for
+   caching remote memory.
+
+   Copyright 1992, 1993 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef DCACHE_H
+#define DCACHE_H
+
+#define LINE_SIZE_POWER (4)
+/* eg 1<<3 == 8 */
+#define LINE_SIZE (1 << LINE_SIZE_POWER)
+/* Number of cache blocks */
+#define DCACHE_SIZE (64)
+
+struct dcache_block
+{
+  struct dcache_block *next, *last;
+  unsigned int addr; /* Address for which data is recorded.  */
+  int data[LINE_SIZE / sizeof (int)];
+};
+
+typedef int (*memxferfunc) PARAMS((CORE_ADDR memaddr,
+			     unsigned char *myaddr,
+			     int len));
+
+typedef struct {
+  /* Function to actually read the target memory. */
+  memxferfunc read_memory;
+
+  /* Function to actually write the target memory */
+  memxferfunc write_memory;
+
+  /* free list */
+  struct dcache_block dcache_free;
+
+  /* in use list */
+  struct dcache_block dcache_valid;
+
+  /* The cache itself. */
+  struct dcache_block *the_cache;
+
+} DCACHE;
+
+int dcache_fetch PARAMS((DCACHE *dcache, CORE_ADDR addr));
+void dcache_flush PARAMS((DCACHE *dcache));
+DCACHE *dcache_init PARAMS((memxferfunc reading, memxferfunc writing));
+
+/* Write the word at ADDR both in the data cache and in the remote machine.  */
+void dcache_poke PARAMS((DCACHE *dcache, CORE_ADDR addr, int data));
+
+#endif /* DCACHE_H */