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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/bootvars.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/fbdev.h>
#include <os/kalloc.h>
#include <os/module.h>
#include <os/ns.h>
#include <io/video/fbdev.h>
#include <vm/map.h>
#include <vm/mmu.h>
#include <string.h>
static struct fb_info info;
/*
* Map the framebuffer, we'll decided how many bytes
* is mapped.
*/
static ssize_t
fbdev_map(struct mac_border *mbp, struct mac_map_args *args)
{
int prot = PROT_READ | PROT_WRITE | PROT_USER;
size_t max_size = 0;
struct bootvars bv;
struct proc *self = proc_self();
struct vm_vas vas;
struct bootvar_fb *fbvar;
struct mmu_map spec;
int error;
/* Grab the bootvars */
error = bootvars_read(&bv, 0);
if (error < 0) {
return error;
}
/* Grab the current VAS for mapping */
error = mmu_this_vas(&vas);
if (error < 0) {
return error;
}
fbvar = &bv.fbvars;
max_size = fbvar->width * fbvar->pitch;
if (args->len > max_size) {
args->len = max_size;
}
spec.pa = VIRT_TO_PHYS(fbvar->io);
spec.va = spec.pa;
error = vm_map(&vas, &spec, args->len, prot);
if (error < 0) {
return error;
}
*args->dp_res = (void *)VIRT_TO_PHYS(fbvar->io);
return args->len;
}
static int
fbdev_getattr(struct mac_border *mbp, void *p, size_t len)
{
len = MIN(len, sizeof(struct fb_info));
memcpy(p, &info, len);
return 0;
}
static int
fbdev_init(struct module *modp)
{
struct bootvar_fb *fbvar;
struct bootvars bv;
struct ns_obj *obj;
int error;
obj = kalloc(sizeof(*obj));
if (obj == NULL) {
return -EINVAL;
}
/* Grab the bootvars */
error = bootvars_read(&bv, 0);
if (error < 0) {
return error;
}
fbvar = &bv.fbvars;
info.width = fbvar->width;
info.height = fbvar->height;
info.pitch = fbvar->pitch;
/* Initialize the object */
if ((error = ns_obj_init(obj)) < 0) {
return error;
}
obj->data = &info;
return ns_obj_enter(0, obj, FBDEV_NSO);
}
static struct mac_ops ops = {
.map = fbdev_map,
.sync = NULL,
.getattr = fbdev_getattr
};
struct mac_border g_fbdev_border = {
.level = MAC_RESTRICTED,
.ops = &ops
};
MODULE_EXPORT("fbdev", MODTYPE_GENERIC, fbdev_init);
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