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write_const_data(9)


NAME

  write_const_data - Modify kernel text or const data that is replicated
  across RADs on a NUMA platform


SYNOPSIS

  #include <sys/systm.h>

  void write_const_data(
	  void *source,
	  const void *address,
	  size_t nbytes );


PARAMETERS

  source
      Points to the starting address of the text to be written.

  address
      Points to the address where modification starts.

  nbytes
      Specifies the number of bytes to be copied.


DESCRIPTION

  The write_const_data() function modifies kernel text or const data that has
  been replicated in memory accessed by different CPUs. This function also
  ensures that the modifications are visible to all CPUs by automatically
  notifying the CPUs of the change so that they can flush stale data from
  their instruction caches.

  Starting with Tru64 UNIX Version 5.1, kernel programs must use
  write_const_data() to modify kernel data structures, such as the system
  call table. This requirement does not affect most kernel applications,
  which typically do not modify replicated kernel text or const data.

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