DUMP(9E) Driver Entry Points DUMP(9E)

NAME

dump - dump memory to device during system failure

SYNOPSIS

#include <sys/types.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>


int dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblk);

INTERFACE LEVEL

illumos specific (illumos DDI). This entry point is required. For drivers
that do not implement dump() routines, nodev(9F) should be used.

ARGUMENTS

dev
Device number.


addr
Address for the beginning of the area to be dumped.


blkno
Block offset to dump memory.


nblk
Number of blocks to dump.

DESCRIPTION

dump() is used to dump a portion of virtual address space directly to a
device in the case of system failure. It can also be used for checking
the state of the kernel during a checkpoint operation. The memory area to
be dumped is specified by addr (base address) and nblk (length). It is
dumped to the device specified by dev starting at offset blkno. Upon
completion dump() returns the status of the transfer.


When the system is panicking, the calls of functions scheduled by
timeout(9F) and ddi_trigger_softintr(9F) will never occur. Neither can
delay(9F) be relied upon, since it is implemented via timeout(). See
ddi_in_panic(9F).


dump() is called at interrupt priority.

RETURN VALUES

dump() returns 0 on success, or the appropriate error number.

SEE ALSO

cpr(4), nodev(9F)


Writing Device Drivers

October 9, 2001 DUMP(9E)