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// MIT License, Copyright (c) 2021 Marvin Borner
#include <assert.h>
#include <cpu.h>
#include <def.h>
#include <errno.h>
#include <fb.h>
#include <io.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 vbe_basic *vbe = NULL;
static u32 fb_map_buffer(struct page_dir *dir)
{
assert(vbe);
u32 size = vbe->height * vbe->pitch;
return virtual_alloc(dir, memory_range_around((u32)vbe->fb, size), MEMORY_USER).base;
}
static u32 fb_owner = 0;
static res fb_ioctl(u32 request, void *arg1, void *arg2, void *arg3)
{
UNUSED(arg2);
UNUSED(arg3);
switch (request) {
case IOCTL_FB_GET: {
if (!vbe)
return -ENOENT;
u32 size = MIN(sizeof(*vbe), (u32)arg2);
if (!memory_writable_range(memory_range(arg1, size)))
return -EFAULT;
if (fb_owner != 0 && proc_from_pid(fb_owner))
return -EBUSY;
else
fb_owner = proc_current()->pid;
u32 fb = fb_map_buffer(proc_current()->page_dir);
vbe->fb = (u8 *)fb;
memcpy_user(arg1, vbe, size);
return EOK;
}
default:
return -EINVAL;
}
}
CLEAR void fb_install(void)
{
vbe = (void *)multiboot_vbe();
struct io_dev *dev = zalloc(sizeof(*dev));
dev->control = fb_ioctl;
io_add(IO_FRAMEBUFFER, dev);
// Identity map framebuffer to kernel to prevent unwanted writing
u32 size = vbe->height * vbe->pitch;
memory_map_identity(virtual_kernel_dir(), memory_range_around((u32)vbe->fb, size),
MEMORY_CLEAR);
}
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