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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/limine.h>
#include <sys/device.h>
#include <sys/driver.h>
#include <dev/video/fbdev.h>
#include <vm/vm.h>
#include <fs/devfs.h>
#define FRAMEBUFFER \
framebuffer_req.response->framebuffers[0]
static volatile struct limine_framebuffer_request framebuffer_req = {
.id = LIMINE_FRAMEBUFFER_REQUEST,
.revision = 0
};
static struct device *dev;
static paddr_t
fbdev_mmap(struct device *dev, off_t off, vm_prot_t prot)
{
struct fbdev fbdev = fbdev_get_front();
paddr_t len = fbdev.width * fbdev.pitch;
paddr_t base = VIRT_TO_PHYS(fbdev.mem);
paddr_t max_paddr = base + len;
if (base + off > max_paddr) {
return 0;
}
return base + off;
}
struct fbdev
fbdev_get_front(void)
{
struct fbdev ret;
ret.mem = FRAMEBUFFER->address;
ret.width = FRAMEBUFFER->width;
ret.height = FRAMEBUFFER->height;
ret.pitch = FRAMEBUFFER->pitch;
return ret;
}
static int
fbdev_init(void)
{
dev = DEVICE_ALLOC();
dev->blocksize = 1;
dev->read = NULL;
dev->write = NULL;
dev->mmap = fbdev_mmap;
device_create(dev, device_alloc_major(), 1);
devfs_add_dev("fb", dev);
return 0;
}
DRIVER_EXPORT(fbdev_init);
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