On Thu, Apr 19, 2001 at 04:50:09 -0000, eeh@netbsd.org wrote:
> 	>  > 8042 at obio0 slot 0 offset 0x300060 not configured
> 	> 
> 	> Huh, PC keyboard controller.  All this time I had assumed that they
> 	> put the PC keyboard on a Zilog SCC.
> 
> Need to get a full dump of the OFW nodes to really know what's
> going on there.

ok dev /
ok ls
f002d248 sbus
f002b4a4 obio
f002816c virtual-memory
f0027e38 memory@0,0
f0017d28 aliases
f0017cec options
f0017c30 openprom
f0017bf4 chosen
f0017bb8 packages
ok .properties
idprom                   01 80 08 00 20 87 b4 c4 00 00 00 00 87 b4 c4 a9 
network-ok               
network-error            
model                    SUNW,501-3141
name                     SUNW,JDM1
banner-name              JavaStation
breakpoint-trap          0000007f 
#size-cells              00000001 
#address-cells           00000002 
ok dev /obio
ok .properties
device_type              hierarchical
ranges                   00000000 00000000 00000000 71000000 01000000 
name                     obio
ok ls
f002bbf0 8042@0,300060
f002b73c su@0,3002f8
f002b6e4 eeprom@0,200000
f002b68c auxio@0,900000
f002b628 counter@0,d00000
f002b5c0 interrupt@0,e00000
ok dev /obio/8042
ok .properties   
#size-cells              00000000 
#address-cells           00000001 
reg                      00000000 00300060 00000008 
                         00000000 00300060 00000008 
device_type              8042
name                     8042
model                    INTC,80c42
ok ls
f002cd60 kdmouse@1
f002c1f4 keyboard@0
ok dev /obio/8042/keyboard
ok .properties            
reg                      00000000 
language                 EN
compatible               pnpPNP,303
port-b-ignore-cd         
port-a-ignore-cd         
keyboard                 
device_type              serial
name                     keyboard
ok dev /obio/8042/kdmouse 
ok .properties           
reg                      00000001 
compatible               pnpPNP,f03
port-b-ignore-cd         
port-a-ignore-cd         
mouse                    
device_type              serial
name                     kdmouse


Don't have OBP2 box handy.


> 1) Put the kernel below F0000000.  This will severly limit both the
> size of the kernel and userspace.

Can you give me a hint why?


> 2) Put the kernel above the PROM, say at F1000000 but start
> userspace at F000000.  This is probably the simplest solution.  For
> this you need change things so either KERNBASE is at F0000000 but
> TRAPBASE is higher, or TRAPBASE and KERNBASE are above the PROM but
> the end of the user stack is below the PROM.

As I wrote, I considered this.  I decided that I want to beat the box
into submission first by going with 1) above and then do the acrobatic
exercises required for this layout.


> 3) Bite the bullet and separate the kernel address space from user
> address spaces.  This is what I did for sparc64.  To do this you
> need to be sure that the MMU can handle this sort of thing.  You
> need to fix copyin(), copyout(), [fs]u{byte,word,long}, and fix
> some drivers that access userspace w/o using copyin()/copyout().

Wow.  Way too risky a change for a very small (even in percents)
potential installation base.

SY, Uwe
-- 
uwe@ptc.spbu.ru                         |       Zu Grunde kommen
http://www.ptc.spbu.ru/~uwe/            |       Ist zu Grunde gehen