> From:           gwr@jericho.mc.com (Gordon W. Ross)
> Date sent:      Tue, 30 Aug 94 11:23:08 EDT
> To:             tuc@valhalla.stormking.com
> Copies to:      port-sun3@sun-lamp.cs.berkeley.edu
> Subject:        Status of Port (Sun3/50 bwtwo)
> Send reply to:  gwr@mc.com (Gordon W. Ross)

> If someone would like to try it, I think it might be sufficient to
> just permanently allocate 128k of space from the kernel_map at the
> location of the Sun3/50 bwtwo before anything else tries to use it.
> The Sun3/50 bwtwo will end up mapped at 0x0E100000 (in kernel).
> 
> I am not quite sure how to make the vm code do this, but I think
> it might look something like this:
> 
> /* Somewhere before file-system buffer allocation... */
> 
> if (cpu_machine_id == SUN3_MACH_50) {
>     caddr_t bwtwo_beg = 0x0E100000; /* XXX macros... */
>     caddr_t bwtwo_end = 0x0E120000; /* XXX macros... */
>     caddr_t bwtwo_off;
>     int ret;
> 
>     bwtwo_off = bwtwo_kva - VM_MIN_KERNEL_ADDRESS;
                     ^
                     |
I don't quite understand what I should use for `bwtwo_kva'.
I can nowhere find a reference to this variable. Using the values
0x100000 and 0x0E100000 both result in 'can not reserve bwtwo memory'
 
>     vm_map_lock(kernel_map);
>     ret = vm_map_insert(kernel_map, NULL, bwtwo_off,
>             bwtwo_beg, bwtwo_end);

What is vm_map_insert supposed to do?
What are the semantics of the various vm routines?

>     vm_map_unlock(kernel_map);
>     if (ret != KERN_SUCCESS) {
>         printf("can not reserve bwtwo memory\n");
>         /* XXX - Disable bwtwo somehow... */
>     }
> }
> 
> So, does anyone with a 3/50 care to try this out?  You may need to
> study the VM code a bit to figure out how to make this work.  Also,
> if you manage to reserve the frame buffer RAM, you will probably want
> to make it available to a bwtwo driver later...
> 
> Volunteers? 
> 
> Gordon Ross

Kind Regrads,

Harry Schreurs 

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