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# zx_vmar_op_range
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Perform an operation on VMOs mapped into this VMAR.
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#include <zircon/syscalls.h>
zx_status_t zx_vmar_op_range(zx_handle_t handle,
uint32_t op,
zx_vaddr_t address,
size_t size,
void* buffer,
size_t buffer_size);
`zx_vmo_op_range()` performs operation *op* on VMOs mapped in the range *address* to *address*+*size*.
*address* and *size* must fall entirely within this VMAR, and must meet the alignment requirements specified for *op* by [`zx_vmo_op_range()`].
*buffer* and *buffer_size* are currently unused, and must be empty
The supported operations are:
**ZX_VMO_OP_DECOMMIT** - Deprecated. Use **ZX_VMAR_OP_DECOMMIT** instead.
**ZX_VMAR_OP_DECOMMIT** - Requires the **ZX_RIGHT_WRITE** right, and applies only to writable mappings.
**ZX_VMAR_OP_MAP_RANGE** - Populates entries in the CPU page tables (or architectural equivalent) for committed pages in the given range. Entries for uncommitted pages in the range are not populated. Fails if entries already exist for any page in the range (this may change in the future).
The operation's semantics are otherwise as described by [`zx_vmo_op_range()`].
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If *op* is **ZX_VMO_OP_DECOMMIT**, affected mappings must be writable.
`zx_vmar_op_range()` returns **ZX_OK** on success. In the event of failure, a negative error value is returned.
**ZX_ERR_ACCESS_DENIED** *handle*, or one of the affected VMO mappings, does not have sufficient rights to perform the operation.
**ZX_ERR_BAD_HANDLE** *handle* is not a valid handle.
**ZX_ERR_BAD_STATE** *handle* is not a live VMAR, or the range specified by *address* and *size* spans un-mapped pages.
**ZX_ERR_INVALID_ARGS** *buffer* is non-null, or *buffer_size* is non-zero, *op* is not a valid operation, *size* is zero, or *address* was not page-aligned.
**ZX_ERR_NOT_SUPPORTED** *op* was not **ZX_VMO_OP_DECOMMIT**, or one or more mapped VMOs do not support the requested *op*.
**ZX_ERR_OUT_OF_RANGE** The range specified by *address* and *size* is not wholy within the VM address range specified by *handle*.
**ZX_ERR_WRONG_TYPE** *handle* is not a VMAR handle.
- [`zx_vmar_map()`]
- [`zx_vmar_unmap()`]
- [`zx_vmo_op_range()`]
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