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// MIT License, Copyright (c) 2021 Marvin Borner
#include <assert.h>
#include <def.h>
#include <dev.h>
#include <drivers/cpu.h>
#include <drivers/vbe.h>
#include <errno.h>
#include <fb.h>
#include <mem.h>
#include <mm.h>
#include <multiboot.h>
#include <str.h>
#include <sys.h>
struct vbe_basic {
u8 stuff1[16];
u16 pitch;
u16 width;
u16 height;
u8 stuff2[18];
u8 *fb;
u8 stuff3[212];
};
PROTECTED static struct fb_generic generic = { 0 };
static u32 fb_owner = 0;
static res vbe_control(u32 request, void *arg1, void *arg2, void *arg3)
{
UNUSED(arg3);
switch (request) {
case DEVCTL_FB_GET: {
if (!generic.fb)
return -ENOENT;
u32 size = MIN(sizeof(generic), (u32)arg2);
if (!memory_writable_range(memory_range(arg1, size)))
return -EFAULT;
if (fb_owner != 0 && proc_from_pid(fb_owner))
return -EBUSY;
fb_owner = proc_current()->pid;
u32 fb = fb_map_buffer(proc_current()->page_dir, &generic);
stac();
memcpy(arg1, &generic, size);
((struct fb_generic *)arg1)->fb = (u8 *)fb;
clac();
return EOK;
}
default:
return -EINVAL;
}
}
CLEAR void vbe_install(u32 data)
{
struct vbe_basic *vbe = (void *)data;
generic.bpp = (vbe->pitch / vbe->width) << 3;
generic.pitch = vbe->pitch;
generic.width = vbe->width;
generic.height = vbe->height;
generic.fb = vbe->fb;
fb_protect(&generic);
struct dev_dev *dev = zalloc(sizeof(*dev));
dev->control = vbe_control;
dev_add(DEV_FRAMEBUFFER, dev);
}
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