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Full Discussion: 32bit vs 64bit
Top Forums UNIX for Dummies Questions & Answers 32bit vs 64bit Post 25277 by Marc Rochkind on Friday 26th of July 2002 11:07:26 PM
Old 07-27-2002
All OSes can can process 32-bit and 64-bit numbers (actually, even longer ones). And, if the hardware supports, say, 64-bit integers natively, then it is possible for a compiler to support those instructions on any OS.

But, what one usually means by a "64-bit OS" is that the OS itself exploits the newer features of a 64-bit processor. That is, if native data moves are in 64-bit chunks, then the OS moves data that way. If a huge amount of memory can be addressed, then the OS can use it. If device drivers can be faster because of higher bandwidth, then the OS has such drivers. And so on.

But, even on such an OS, whether applications use the "64-bit features" is entirely up to the design of the program and/or the compiler that's generating the code.
Marc Rochkind
 

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LEARN ABOUT NETBSD

siop

SIOP(4) 						   BSD Kernel Interfaces Manual 						   SIOP(4)

NAME

     siop -- Symbios Logic/NCR 53c8xx SCSI driver

SYNOPSIS

   hp700
     siop* at mainbus? irq 3
     siop* at phatomas? irq 3

   PCI
     siop* at pci? dev ? function ?

     options SIOP_SYMLED
     scsibus* at siop?

DESCRIPTION

     The siop driver provides support for the Symbios Logic/NCR 53x8xx series of SCSI controller chips:

	   -   53c810, 53c810a and 53c815 (Fast SCSI)
	   -   53c820, 53c825 and 53c825a (Fast-Wide SCSI)
	   -   53c860 (Ultra SCSI)
	   -   53c875 and 53c875j (Ultra-Wide SCSI)
	   -   53c876 (Dual Ultra-Wide SCSI)
	   -   53c885 (Ultra-Wide SCSI and Ethernet)
	   -   53c895 (Ultra2-Wide SCSI)
	   -   53c896 (PCI 64bit, dual Ultra2-Wide SCSI)
	   -   53c1010-33 (PCI 64bit, dual Ultra160 SCSI)
	   -   53c1510d (PCI 64bit, dual Ultra2-wide SCSI)
     The SIOP_SYMLED option causes the driver to report SCSI activity on the GPIO pin 1, which is connected to the activity LED on some adapters.
     At this time only the 53c895 based Symbios and Tekram adapters are known to require this.

     If both siop and the esiop(4) drivers are compiled, esiop(4) will take precedence for controllers it supports.

SEE ALSO

     cd(4), ch(4), esiop(4), intro(4), pci(4), scsi(4), sd(4), st(4), uk(4)

HISTORY

     The siop driver first appeared in NetBSD 1.5.

AUTHORS

     The siop driver was written by Manuel Bouyer <Manuel.Bouyer@lip6.fr> for NetBSD.

BUGS

     siop supports the 53c1010-33 in Ultra2-wide mode only.  Use esiop(4) for Ultra160 support.

BSD
								   April 5, 2008							       BSD
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