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page_size(9v)


NAME

  page_size - Global Variable: Is the virtual page size


SYNOPSIS

  extern vm_size_t page_size;


DESCRIPTION

  The page_size global variable	 is the size of a virtual page on a CPU. A
  device driver can use this global variable to partition I/O transfers so
  that they never cross a virtual page boundary. You should use this global
  variable only when:

    ·  A subsystem cannot use the DMA mapping routines (such as,
       dma_map_alloc, dma_map_load, and so forth)

    ·  There is a one-to-one correspondence between the system memory map and
       the I/O's view of the system memory space


FILES

  /usr/sys/include/mach/vm_param.h

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