Question

outb outw

Asked by: marvel

Can someone explain outb and outw

I assume the following but do not know for sure:

outw(val, x)

say val = 0x8000

will write:
0x80 to x
and 0x00 to x+1

is this equivalent to
outb(0x80, x)
outb(0x00, x+1) ?

what does the following do?
outw(0x40, x)

what does this do?
outb(0x444, x)

thanx for ya help

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Asked On
1999-01-31 at 17:07:34ID10123540
Tags

outb

Topic

Unix Systems Programming

Participating Experts
2
Points
200
Comments
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Answers

 

by: gurpreetsPosted on 1999-02-01 at 03:01:56ID: 1296440

outw and outb are used to write to an I/O port.

In order to use these functions, you will have to include the header files -
  sys/ddi.h
  sys/sunddi.h

The syntax is -

 void outb (int port, unsigned char value);
 void outw (int port, unsigned short value);

These routines write data of various sizes to the I/O port with the address specified by the port.

outb and outw write 8 bits and 16 bits of data, respectively.




 

by: MoondancerPosted on 2002-02-24 at 19:34:40ID: 6823684

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