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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/limine.h>
#include <sys/device.h>
#include <sys/driver.h>
#include <dev/video/fbdev.h>
#include <fs/devfs.h>
#include <vm/vm.h>
#define FRAMEBUFFER \
framebuffer_req.response->framebuffers[0]
static struct cdevsw fb_cdevsw;
static volatile struct limine_framebuffer_request framebuffer_req = {
.id = LIMINE_FRAMEBUFFER_REQUEST,
.revision = 0
};
static paddr_t
fbdev_mmap(dev_t dev, off_t off, int flags)
{
size_t max_bounds;
max_bounds = FRAMEBUFFER->pitch * FRAMEBUFFER->height;
max_bounds /= 4;
if (off > max_bounds) {
return 0;
}
return VIRT_TO_PHYS(FRAMEBUFFER->address);
}
struct fbdev
fbdev_get(void)
{
struct fbdev ret;
ret.mem = FRAMEBUFFER->address;
ret.width = FRAMEBUFFER->width;
ret.height = FRAMEBUFFER->height;
ret.pitch = FRAMEBUFFER->pitch;
ret.bpp = FRAMEBUFFER->bpp;
return ret;
}
static int
fbdev_init(void)
{
char devname[] = "fb0";
devmajor_t major;
dev_t dev;
/* Register the device here */
major = dev_alloc_major();
dev = dev_alloc(major);
dev_register(major, dev, &fb_cdevsw);
devfs_create_entry(devname, major, dev, 0444);
return 0;
}
static struct cdevsw fb_cdevsw = {
.read = noread,
.write = nowrite,
.mmap = fbdev_mmap
};
DRIVER_EXPORT(fbdev_init);
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