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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* 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 the project 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/proc.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <io/video/fbdev.h>
#include <os/mac.h>
static struct mac_border *bortab[__BORDER_MAX] = {
[BORDER_NONE] = NULL,
[BORDER_FBDEV] = &g_fbdev_border
};
/*
* Check process creds against border
*/
int
mac_check_creds(struct proc *procp, struct mac_border *mbp)
{
if (procp == NULL || mbp == NULL) {
return -EINVAL;
}
if (procp->level < mbp->level) {
return -EACCES;
}
return 0;
}
/*
* Map a resource into process address space
*/
ssize_t
mac_map(struct mac_border *mbp, off_t off, size_t len, void **res, int flags)
{
struct mac_map_args args;
struct proc *procp = proc_self();
struct mac_ops *ops;
int error;
if (procp == NULL || mbp == NULL) {
return -EINVAL;
}
if (res == NULL) {
return -EINVAL;
}
error = mac_check_creds(procp, mbp);
if (error < 0) {
return error;
}
ops = mbp->ops;
if (ops->map == NULL) {
return -EIO;
}
args.off = off;
args.len = len;
args.flags = flags;
args.dp_res = res;
return ops->map(mbp, &args);
}
/*
* Grab a specific border using an ID
*/
struct mac_border *
mac_get_border(border_id_t id)
{
if (id >= NELEM(bortab)) {
return NULL;
}
return bortab[id];
}
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