Booting questions ....

wjw_at_withagen.nl

Date: Thu, 04 Nov 2004 23:47:18 +0100
To: "arch@freebsd.org" <arch@freebsd.org>


----
         /*
          * Display any holes after the first chunk of extended memory.
          */
         if (bootverbose) {
                 int indx;
                 printf("Physical memory chunk(s):\n");
                 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
                         vm_paddr_t size;
                         size = phys_avail[indx + 1] - phys_avail[indx];
                         printf(
                             "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
                             (uintmax_t)phys_avail[indx],
                             (uintmax_t)phys_avail[indx + 1] - 1,
                             (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
                 }
         }
#ifdef MEMTEST
	if (bootmemtest) {
                 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
                         vm_paddr_t size;
                         size = phys_avail[indx + 1] - phys_avail[indx];
			memtest (
                             /* start */ (uintmax_t)phys_avail[indx],
                             /* end */   (uintmax_t)phys_avail[indx + 1] - 1,
                             /*size */   (uintmax_t)size
			);
                 }
	}	
#endif MEMTEST
         vm_ksubmap_init(&kmi);
----
And in memtest I can just linearly iterate over the memory between these 
pointers without getting pagefaults....
Next question is where to watch for already taken memory:
  - code
  - data
  - stack
What modules are already setup by the time we enter the code above???
Or the alternative would be to just exclude for the code and data of the 
memtests routines them selves. But then printf would probably be destroyed as 
well, and there would be no "tracing" of memtest activity.
Thanx,
--WjW
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