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Code Issues Releases Wiki Activity

video/fb: add munmap support 

This adds support to user-space munmap() requests in kernel build.

Signed-off-by: Yanfeng Liu <yfliu2008@qq.com>
This commit is contained in:
Yanfeng Liu 2024-05-05 08:04:47 +08:00 committed by Xiang Xiao
parent 339da96469
commit 9d6e2b97fb
1 changed files with 25 additions and 0 deletions
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25
drivers/video/fb.c
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@ -135,6 +135,12 @@ static int fb_sem_wait(FAR struct fb_chardev_s *fb,
static void fb_sem_post(FAR struct fb_chardev_s *fb, int overlay);
#endif
#ifdef CONFIG_BUILD_KERNEL
static int fb_munmap(FAR struct task_group_s *group,
FAR struct mm_map_entry_s *entry,
FAR void *start, size_t length);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
@ -1002,6 +1008,22 @@ static int fb_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
return ret;
}
#ifdef CONFIG_BUILD_KERNEL
static int fb_munmap(FAR struct task_group_s *group,
FAR struct mm_map_entry_s *entry,
FAR void *start, size_t length)
{
if (group && entry)
{
ginfo("%p, len=%zu\n", entry->vaddr, entry->length);
vm_unmap_region(entry->vaddr, entry->length);
mm_map_remove(get_current_mm(), entry);
}
return OK;
}
#endif
static int fb_mmap(FAR struct file *filep, FAR struct mm_map_entry_s *map)
{
FAR struct inode *inode;
@ -1035,6 +1057,9 @@ static int fb_mmap(FAR struct file *filep, FAR struct mm_map_entry_s *map)
#ifdef CONFIG_BUILD_KERNEL
map->vaddr = vm_map_region((uintptr_t)panelinfo.fbmem + map->offset,
panelinfo.fblen);
map->length = panelinfo.fblen;
map->munmap = fb_munmap;
mm_map_add(get_current_mm(), map);
#else
map->vaddr = (FAR char *)panelinfo.fbmem + map->offset;
#endif