main/syscalls/pci_add_subtract_io_range.md

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# zx_pci_add_subtract_io_range

## Summary

This function is obsolete and should not be used.

## Declaration

```c
#include <zircon/syscalls.h>

zx_status_t zx_pci_add_subtract_io_range(zx_handle_t handle,
                                         uint32_t mmio,
                                         uint64_t base,
                                         uint64_t len,
                                         uint32_t add);
```

## Description

This function is obsolete and should not be used. Drivers should instead use the PCI protocol
Typically, you obtain this in your `bind()` function through `device_get_protocol()`.

## Rights

*handle* must have resource kind `ZX_RSRC_KIND_MMIO`.

## Return value

TODO(https://fxbug.dev/42108078)

## Errors

TODO(https://fxbug.dev/42108078)

## See also

TODO(https://fxbug.dev/42108078)