.nr H1 8
.nr H2 0
.ds CF \*(DY
.ds RH "Magic numbers
.bp
.LG
.B
.ce
8. KERNEL MAGIC NUMBERS
.sp 2
.R
.NL
.PP
This sections contains a collection of magic numbers for use in patching
core or an executable unix binary.  Some of them have also been mentioned
earlier in this paper.  
With the exception of the \fIxp_type[i]\fP variables (which hold bytes)
and \fIswplo\fP (which is a long) all locations given contain short integers.
N.B.:  in the case of paired interrupt vectors (for DHs and DZs) the address
of the second vector of the pair is four more than
the address of the first vector.
.PP
.sp 1i
.TS
center;
c s s s s
c c c c c
l l n n n.
Interrupt Vectors
.sp .5
Vector	Handler	Contents	Block device	Character device
0160	rlio	01202	8	18
0210	hkio	01142	4	19
0220	rkio	01172	0	9
0224	tmio	01222	3	12
0224	htio	01152	7	15
0224	tsio	01232	9	20
0254	xpio	01242	6	14
0260	rpio	01212	1	11
\(dg	dzin	01132	-	21
\(dg	dzdma	02202	-	21
\(dg	dhin	01112	-	4
\(dg	dhou	01122	-	4
\(dg	lpio	01162	-	2
.TE
.FS
\u\(dg\d Set by \fIautoconfig\fP\|(8).
.FE
.bp
.TS
center;
c s s
c c c
l n n.
Other Variables
.sp .5
Name	Address	Contents
xp_addr	061464	0176700
xp_type[0]	061472	\(dd
xp_type[1]	061506	\(dd
xp_type[2]	061522	\(dd
xp_type[3]	061536	\(dd
HKADDR	061006	0177440
HTADDR	0114226	\(dg
RKADDR	061152	0177400
RLADDR	061154	0174400
RPADDR	061236	0176710
TMADDR	0113320	\(dg
TSADDR	0113612	\(dg
dz_addr	0113314	\(dg
dh_addr	0114136	\(dg
lp_addr	0113452	\(dg
rootdev	060772	*
pipedev	060776	*
swapdev	060774	*
swplo	061000	*
nswap	061004	*
.TE
.FS
\(dg Set by \fIautoconfig\fP\|(8).
.br
\(dd Set by reading the corresponding drive type register.
.br
* System dependent.
.FE