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Remove the requirement that phys_avail be sorted in ascending order 

by explicitly finding the lowest and highest addresses when calculating
the size of the vm_pages array

Reviewed by :alc
This commit is contained in:
Kip Macy 2006-12-08 08:44:47 +00:00
parent 8abbcd2910
commit 35d10226b7
1 changed files with 10 additions and 2 deletions
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12
sys/vm/vm_page.c
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@ -212,6 +212,7 @@ vm_page_startup(vm_offset_t vaddr)
/* the biggest memory array is the second group of pages */
vm_paddr_t end;
vm_paddr_t biggestsize;
vm_paddr_t low_water, high_water;
int biggestone;
vm_paddr_t total;
@ -227,6 +228,9 @@ vm_page_startup(vm_offset_t vaddr)
phys_avail[i + 1] = trunc_page(phys_avail[i + 1]);
}
low_water = phys_avail[0];
high_water = phys_avail[1];
for (i = 0; phys_avail[i + 1]; i += 2) {
vm_paddr_t size = phys_avail[i + 1] - phys_avail[i];
@ -234,6 +238,10 @@ vm_page_startup(vm_offset_t vaddr)
biggestone = i;
biggestsize = size;
}
if (phys_avail[i] < low_water)
low_water = phys_avail[i];
if (phys_avail[i + 1] > high_water)
high_water = phys_avail[i + 1];
++nblocks;
total += size;
}
@ -289,8 +297,8 @@ vm_page_startup(vm_offset_t vaddr)
* use (taking into account the overhead of a page structure per
* page).
*/
first_page = phys_avail[0] / PAGE_SIZE;
page_range = phys_avail[(nblocks - 1) * 2 + 1] / PAGE_SIZE - first_page;
first_page = low_water / PAGE_SIZE;
page_range = high_water / PAGE_SIZE - first_page;
npages = (total - (page_range * sizeof(struct vm_page)) -
(end - new_end)) / PAGE_SIZE;
end = new_end;