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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/errno.h>
#include <fs/ctlfs.h>
#include <vm/physmem.h>
#include <vm/vm.h>
#include <vm/stat.h>
#include <string.h>
#include <sys/syslog.h>
static struct ctlops vm_stat_ctl;
/*
* ctlfs hook to read the virtual memory
* statistics.
*/
static int
vm_stat_read(struct ctlfs_dev *cdp, struct sio_txn *sio)
{
struct vm_stat stat;
int error;
if (sio->len > sizeof(stat)) {
sio->len = sizeof(stat);
}
error = vm_stat_get(&stat);
if (error < 0) {
return error;
}
memcpy(sio->buf, &stat, sio->len);
return sio->len;
}
int
vm_stat_get(struct vm_stat *vmstat)
{
if (vmstat == NULL) {
return -EINVAL;
}
vmstat->mem_avail = vm_mem_free();
vmstat->mem_used = vm_mem_used();
vmstat->mem_total = vm_mem_total();
return 0;
}
void
vm_stat_init(void)
{
char devname[] = "vm";
struct ctlfs_dev ctl;
/* Register a stat control file */
ctl.mode = 0444;
ctlfs_create_node(devname, &ctl);
ctl.devname = devname;
ctl.ops = &vm_stat_ctl;
ctlfs_create_entry("stat", &ctl);
}
static struct ctlops vm_stat_ctl = {
.read = vm_stat_read,
.write = NULL
};
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