Create a VM object referring to a specific contiguous range of physical memory.
#include <zircon/syscalls.h> zx_status_t zx_vmo_create_physical(zx_handle_t resource, zx_paddr_t paddr, size_t size, zx_handle_t* out);
zx_vmo_create_physical() creates a new virtual memory
object (VMO), which represents the
size bytes of physical memory beginning at physical address paddr.
The content size of the VMO will be initialized to the given (unrounded) size.
zx_object_get_property() with ZX_PROP_VMO_CONTENT_SIZE to read the
content size of the VMO. Use
ZX_PROP_VMO_CONTENT_SIZE to set the content size of the VMO without
actually resizing the VMO.
One handle is returned on success, representing an object with the requested size.
The following rights will be set on the handle by default:
ZX_RIGHT_DUPLICATE - The handle may be duplicated.
ZX_RIGHT_TRANSFER - The handle may be transferred to another process.
ZX_RIGHT_READ - May be read from or mapped with read permissions.
ZX_RIGHT_WRITE - May be written to or mapped with write permissions.
ZX_RIGHT_EXECUTE - May be mapped with execute permissions.
ZX_RIGHT_MAP - May be mapped.
ZX_RIGHT_GET_PROPERTY - May get its properties using
ZX_RIGHT_SET_PROPERTY - May set its properties using
The ZX_VMO_ZERO_CHILDREN signal is active on a newly created VMO. It becomes inactive whenever a child of the VMO is created and becomes active again when all children have been destroyed and no mappings of those children into address spaces exist.
The VMOs created by this syscall are not usable with
resource must have resource kind ZX_RSRC_KIND_MMIO.
zx_vmo_create_physical() returns ZX_OK on success. In the event
of failure, a negative error value is returned.
ZER_ERR_WRONG_TYPE resource is not a handle to a Resource object.
ZER_ERR_ACCESS_DENIED resource does not grant access to the requested range of memory.
ZX_ERR_INVALID_ARGS out is an invalid pointer or NULL, or paddr or size are not page-aligned.
ZX_ERR_NO_MEMORY Failure due to lack of memory. There is no good way for userspace to handle this (unlikely) error. In a future build this error will no longer occur.
ZX_ERR_OUT_OF_RANGE Requested size is too large.