From 552d9de72478bd29827694b8f636d1683d408c55 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Sat, 15 Nov 2025 22:37:13 -0500 Subject: kern: dev: Add video RAM driver Signed-off-by: Ian Moffett --- sys/dev/video/vram.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 sys/dev/video/vram.c (limited to 'sys/dev/video/vram.c') diff --git a/sys/dev/video/vram.c b/sys/dev/video/vram.c new file mode 100644 index 0000000..bc85f32 --- /dev/null +++ b/sys/dev/video/vram.c @@ -0,0 +1,55 @@ +/* + * Copyright (c) 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 +#include +#include +#include + +#define FRAMEBUFFER \ + framebuffer_req.response->framebuffers[0] + +static volatile struct limine_framebuffer_request framebuffer_req = { + .id = LIMINE_FRAMEBUFFER_REQUEST, + .revision = 0 +}; + +int +vram_getdev(struct vram_dev *result) +{ + if (result == NULL) { + return -EINVAL; + } + + result->io = FRAMEBUFFER->address; + result->width = FRAMEBUFFER->width; + result->height = FRAMEBUFFER->height; + result->pitch = FRAMEBUFFER->pitch; + return 0; +} -- cgit v1.2.3