contigmem_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, vm_size_t size,
struct vm_object **obj, int nprot)
{
+ uint64_t buffer_index;
+
/*
* The buffer index is encoded in the offset. Divide the offset by
* PAGE_SIZE to get the index of the buffer requested by the user
* app.
*/
- if ((*offset/PAGE_SIZE) >= contigmem_num_buffers)
+ buffer_index = *offset / PAGE_SIZE;
+ if (buffer_index >= contigmem_num_buffers)
return EINVAL;
- *offset = (vm_ooffset_t)vtophys(contigmem_buffers[*offset/PAGE_SIZE]);
+ memset(contigmem_buffers[buffer_index], 0, contigmem_buffer_size);
+ *offset = (vm_ooffset_t)vtophys(contigmem_buffers[buffer_index]);
*obj = vm_pager_allocate(OBJT_DEVICE, cdev, size, nprot, *offset,
curthread->td_ucred);