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Unix is a family of multitasking, portable, multi-user computer operating systems, which do not have time-sharing capability.
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pci_request_region_exclusive(9) [centos man page]

PCI_REQUEST_REGION_E(9) 					Hardware Interfaces					   PCI_REQUEST_REGION_E(9)

NAME
pci_request_region_exclusive - Reserved PCI I/O and memory resource SYNOPSIS
int pci_request_region_exclusive(struct pci_dev * pdev, int bar, const char * res_name); ARGUMENTS
pdev PCI device whose resources are to be reserved bar BAR to be reserved res_name Name to be associated with resource. DESCRIPTION
Mark the PCI region associated with PCI device pdev BR bar as being reserved by owner res_name. Do not access any address inside the PCI regions unless this call returns successfully. Returns 0 on success, or EBUSY on error. A warning message is also printed on failure. The key difference that _exclusive makes it that userspace is explicitly not allowed to map the resource via /dev/mem or sysfs. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 PCI_REQUEST_REGION_E(9)

Check Out this Related Man Page

PCCBB(4)						   BSD Kernel Interfaces Manual 						  PCCBB(4)

NAME
pccbb -- cardbus bridge driver SYNOPSIS
device cbb device pccard device cardbus device exca DESCRIPTION
The pccbb driver implements the Yenta specification for CardBus bridges. The following PCI cardbus and pcmcia bridges are supported: Cirrus Logic PD6832 Cirrus Logic PD6833 Cirrus Logic PD6834 O2micro OZ6812 O2micro OZ6832 O2micro OZ6833 O2micro OZ6836 O2micro OZ6860 O2micro OZ6872 O2micro OZ6912 O2micro OZ6922 O2micro OZ6933 O2micro OZ6972 O2Micro OZ711E1 O2Micro OZ711M1 Ricoh RL4C475 Ricoh RL4C476 Ricoh RL4C477 Ricoh RL4C478 TI PCI-1031 TI PCI-1130 TI PCI-1131 TI PCI-1210 TI PCI-1211 TI PCI-1220 TI PCI-1221 TI PCI-1225 TI PCI-1250 TI PCI-1251 TI PCI-1251B TI PCI-1260 TI PCI-1260B TI PCI-1410 TI PCI-1420 TI PCI-1450 TI PCI-1451 TI PCI-1510 TI PCI-1515 TI PCI-1520 TI PCI-1530 TI PCI-1620 TI PCI-4410 TI PCI-4450 TI PCI-4451 TI PCI-4510 TI PCI-4520 TI PCI-[67]x[12]1 TI PCI-[67]x20 ENE CB710 ENE CB720 ENE CB1211 ENE CB1255 ENE CB1410 ENE CB1420 Toshiba ToPIC95 Toshiba ToPIC95B Toshiba ToPIC97 Toshiba ToPIC100 TUNABLES
The driver supports the following tunable parameters, which may be added to /boot/loader.conf or set via the sysctl(8) command: hw.cbb.debug Non-zero values cause more verbose information to be printed to aid in debugging problems with the bridge chipset. SEE ALSO
cardbus(4), exca(4), pccard(4) BSD
July 21, 2004 BSD

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