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/*
* Copyright (c) 2023-2024 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 <sys/sio.h>
#include <sys/vfs.h>
#include <sys/cdefs.h>
#include <fs/devfs.h>
#include <vm/obj.h>
#include <vm/vm.h>
#include <vm/pager.h>
static int dv_pager_get(struct vm_object *obj, off_t off, size_t len,
struct vm_page *pg);
static int dv_pager_store(struct vm_object *obj, off_t off, size_t len,
struct vm_page *pg);
static int dv_pager_paddr(struct vm_object *obj, paddr_t *paddr,
vm_prot_t prot);
/* Pager operations */
struct vm_pagerops g_dev_pagerops = {
.get = dv_pager_get,
.store = dv_pager_store,
.get_paddr = dv_pager_paddr
};
/*
* Fetch a device descriptor from a memory
* object.
*
* Returns 0 on success.
*/
static int
dv_get_dev(struct vm_object *obj, struct device **res)
{
struct device *dev;
struct vnode *vp;
int status;
if ((vp = obj->vnode) == NULL)
return -EIO;
/* Now try to fetch the device */
if ((status = devfs_get_dev(vp, &dev)) != 0)
return status;
*res = dev;
return 0;
}
static int
dv_pager_paddr(struct vm_object *obj, paddr_t *paddr, vm_prot_t prot)
{
struct device *dev;
int status;
if (paddr == NULL) {
return -EINVAL;
}
/* Try to fetch the device */
if ((status = dv_get_dev(obj, &dev)) != 0) {
return status;
}
if (dev->mmap == NULL) {
/*
* mmap() is not supported, this is not an object
* we can handle so try switching its operations
* to the vnode pager ops...
*/
obj->pgops = &g_vnode_pagerops;
return -ENOTSUP;
}
*paddr = dev->mmap(dev, 0, prot);
return 0;
}
static int
dv_pager_store(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg)
{
return -1;
}
static int
dv_pager_get(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg)
{
return -1;
}
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