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/* Copyright (C) 1992-2013 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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "target-dcache.h"
#include "gdbcmd.h"
#include "progspace.h"
/* The target dcache is kept per-address-space. This key lets us
associate the cache with the address space. */
static const struct address_space_data *target_dcache_aspace_key;
/* Clean up dcache, represented by ARG, which is associated with
ASPACE. */
static void
target_dcache_cleanup (struct address_space *aspace, void *arg)
{
dcache_free (arg);
}
/* Target dcache is initialized or not. */
int
target_dcache_init_p (void)
{
DCACHE *dcache = address_space_data (current_program_space->aspace,
target_dcache_aspace_key);
return (dcache != NULL);
}
/* Invalidate the target dcache. */
void
target_dcache_invalidate (void)
{
DCACHE *dcache = address_space_data (current_program_space->aspace,
target_dcache_aspace_key);
if (dcache != NULL)
dcache_invalidate (dcache);
}
/* Return the target dcache. Return NULL if target dcache is not
initialized yet. */
DCACHE *
target_dcache_get (void)
{
DCACHE *dcache = address_space_data (current_program_space->aspace,
target_dcache_aspace_key);
return dcache;
}
/* Return the target dcache. If it is not initialized yet, initialize
it. */
DCACHE *
target_dcache_get_or_init (void)
{
DCACHE *dcache = address_space_data (current_program_space->aspace,
target_dcache_aspace_key);
if (dcache == NULL)
{
dcache = dcache_init ();
set_address_space_data (current_program_space->aspace,
target_dcache_aspace_key, dcache);
}
return dcache;
}
/* The option sets this. */
static int stack_cache_enabled_p_1 = 1;
/* And set_stack_cache_enabled_p updates this.
The reason for the separation is so that we don't flush the cache for
on->on transitions. */
static int stack_cache_enabled_p = 1;
/* This is called *after* the stack-cache has been set.
Flush the cache for off->on and on->off transitions.
There's no real need to flush the cache for on->off transitions,
except cleanliness. */
static void
set_stack_cache_enabled_p (char *args, int from_tty,
struct cmd_list_element *c)
{
if (stack_cache_enabled_p != stack_cache_enabled_p_1)
target_dcache_invalidate ();
stack_cache_enabled_p = stack_cache_enabled_p_1;
}
static void
show_stack_cache_enabled_p (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Cache use for stack accesses is %s.\n"), value);
}
/* Return true if "stack cache" is enabled, otherwise, return false. */
int
stack_cache_enabled (void)
{
return stack_cache_enabled_p;
}
/* -Wmissing-prototypes */
extern initialize_file_ftype _initialize_target_dcache;
void
_initialize_target_dcache (void)
{
add_setshow_boolean_cmd ("stack-cache", class_support,
&stack_cache_enabled_p_1, _("\
Set cache use for stack access."), _("\
Show cache use for stack access."), _("\
When on, use the data cache for all stack access, regardless of any\n\
configured memory regions. This improves remote performance significantly.\n\
By default, caching for stack access is on."),
set_stack_cache_enabled_p,
show_stack_cache_enabled_p,
&setlist, &showlist);
target_dcache_aspace_key
= register_address_space_data_with_cleanup (NULL,
target_dcache_cleanup);
}
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