ABSENT_PAGES_IN_RANG(9) Memory Management in Linux ABSENT_PAGES_IN_RANG(9)NAME
absent_pages_in_range - Return number of page frames in holes within a range
SYNOPSIS
unsigned long absent_pages_in_range(unsigned long start_pfn, unsigned long end_pfn);
ARGUMENTS
start_pfn
The start PFN to start searching for holes
end_pfn
The end PFN to stop searching for holes
DESCRIPTION
It returns the number of pages frames in memory holes within a range.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 ABSENT_PAGES_IN_RANG(9)
Check Out this Related Man Page
PCICONFIG_READ(2) Linux Programmer's Manual PCICONFIG_READ(2)NAME
pciconfig_read, pciconfig_write, pciconfig_iobase - pci device information handling
SYNOPSIS
#include <pci.h>
int pciconfig_read(unsigned long bus, unsigned long dfn,
unsigned long off, unsigned long len, void *buf);
int pciconfig_write(unsigned long bus, unsigned long dfn,
unsigned long off, unsigned long len, void *buf);
int pciconfig_iobase(long which, unsigned long bus,
unsigned long devfn);
DESCRIPTION
Most of the interaction with PCI devices is already handled by the kernel PCI layer, and thus these calls should not normally need to be
accessed from userspace.
pciconfig_read()
Reads to buf from device dev at offset off value.
pciconfig_write()
Writes from buf to device dev at offset off value.
pciconfig_iobase()
You pass it a bus/devfn pair and get a physical address for either the memory offset (for things like prep, this is 0xc0000000), the
IO base for PIO cycles, or the ISA holes if any.
RETURN VALUE
pciconfig_read()
On success zero is returned. On error, -1 is returned and errno is set appropriately.
pciconfig_write()
On success zero is returned. On error, -1 is returned and errno is set appropriately.
pciconfig_iobase()
Returns information on locations of various I/O regions in physical memory according to the which value. Values for which are:
IOBASE_BRIDGE_NUMBER, IOBASE_MEMORY, IOBASE_IO, IOBASE_ISA_IO, IOBASE_ISA_MEM.
ERRORS
EINVAL len value is invalid. This does not apply to pciconfig_iobase().
EIO I/O error.
ENODEV For pciconfig_iobase(), "hose" value is NULL. For the other calls, could not find a slot.
ENOSYS The system has not implemented these calls (CONFIG_PCI not defined).
EOPNOTSUPP
This return value is only valid for pciconfig_iobase(). It is returned if the value for which is invalid.
EPERM User does not have the CAP_SYS_ADMIN capability. This does not apply to pciconfig_iobase().
CONFORMING TO
These calls are Linux-specific, available since Linux 2.0.26/2.1.11.
SEE ALSO capabilities(7)COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2003-07-14 PCICONFIG_READ(2)
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