# zx_pci_add_subtract_io_range

## SUMMARY

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This function is obsolete and should not be used.

## DECLARATION

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```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This function is obsolete and should not be used.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

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*handle* must have resource kind **ZX_RSRC_KIND_ROOT**.

## RETURN VALUE

TODO(fxbug.dev/32938)

## ERRORS

TODO(fxbug.dev/32938)

## SEE ALSO


TODO(fxbug.dev/32938)