1ptob(9F)                 Kernel Functions for Drivers                 ptob(9F)
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NAME

6       ptob - convert size in pages to size in bytes
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SYNOPSIS

9       #include <sys/ddi.h>
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13       unsigned long ptob(unsigned long numpages);
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INTERFACE LEVEL

17       Architecture independent level 1 (DDI/DKI).
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PARAMETERS

20       numpages    Size in number of pages to convert to size in bytes.
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DESCRIPTION

24       This  function  returns  the  number of bytes that are contained in the
25       specified number of pages. For example, if the page size is 2048,  then
26       ptob(2) returns 4096. ptob(0) returns 0.
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RETURN VALUES

29       The  return value is always the number of bytes in the specified number
30       of pages. There are no invalid input values, and no  checking  will  be
31       performed  for overflow in the case of a page count whose corresponding
32       byte count cannot be represented  by  an  unsigned  long.  Rather,  the
33       higher order bits will be ignored.
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CONTEXT

36       The  ptob() function can be called from user, interrupt, or kernel con‐
37       text.
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SEE ALSO

40       btop(9F), btopr(9F), ddi_ptob(9F)
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43       Writing Device Drivers
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47SunOS 5.11                        16 Jan 2006                         ptob(9F)