02-21-2008
LInear Addresses
Hi all,
Even after reading many explanation the question still haunting me what's the difference between physical and linear addresses.Can we directly access physical addresses .If not then paging circuitry would have ensure contiguous physical addresses regardless of any linear addresses but this is not the case.
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ln(4) Kernel Interfaces Manual ln(4)
Name
ln - Lance Ethernet interface
Syntax
device ln0 at ibus? vector lnintr
Description
The interface provides access to a 10 Mb/s Ethernet network through the Lance controller.
The host's Internet address is specified at boot time with an SIOCSIFADDR ioctl. The interface employs the address resolution protocol
described in to map dynamically between Internet and Ethernet addresses on the local network.
The interface normally tries to use a trailer encapsulation to minimize copying data on input and output. This can be disabled for an
interface by setting the IFF_NOTRAILERS flag with an SIOCSIFFLAGS ioctl. Trailers are only used for packets destined for Internet hosts.
The SIOCSPHYSADDR ioctl can be used to change the physical address of the Lance. The SIOCRPHYSADDR ioctl can be used to read the physical
address of the Lance.
The SIOCADDMULTI and SIOCDELMULTI ioctls can be used to add or delete multicast addresses. The Lance recognizes a maximum of 12 multicast
addresses.
The SIOCRDCTRS and SIOCRDZCTRS ioctls can be used to read or ``read and clear'' the Ethernet driver counters. The argument to these two
ioctls is a pointer to a counter structure, found in
The SIOCENABLBACK and SIOCDISABLBACK ioctls can be used to enable and disable the interface loopback mode respectively.
Diagnostics
The diagnostic error messages contain relevant information provided by the Lance.
ln%d: can't handle af%d
The interface was handed a message with addresses formated in an unsuitable address family, and the packet was dropped.
ln%d: memory error (MERR)
A memory parity error has occurred.
ln%d: lnalloc: cannot alloc memory ...
The driver was unable to allocate memory for internal data structures.
ln%d: initialization error
The driver was unable to initialize the network interface.
ln%d: SIOCADDMULTI fail, multicast list full
Too many multicast requests have been made.
See Also
arp(4p), inet(4f), intro(4n)
ln(4)