diff options
Diffstat (limited to 'sys/uvm/uvm_page.c')
| -rw-r--r-- | sys/uvm/uvm_page.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/sys/uvm/uvm_page.c b/sys/uvm/uvm_page.c index d6f6e5418af..82951d1c99f 100644 --- a/sys/uvm/uvm_page.c +++ b/sys/uvm/uvm_page.c @@ -1,4 +1,4 @@ -/* $OpenBSD: uvm_page.c,v 1.102 2010/08/07 03:50:02 krw Exp $ */ +/* $OpenBSD: uvm_page.c,v 1.103 2011/04/02 12:38:37 ariane Exp $ */ /* $NetBSD: uvm_page.c,v 1.44 2000/11/27 08:40:04 chs Exp $ */ /* @@ -1464,3 +1464,28 @@ uvm_page_lookup_freelist(struct vm_page *pg) return (vm_physmem[lcv].free_list); #endif } + +/* + * uvm_pagecount: count the number of physical pages in the address range. + */ +psize_t +uvm_pagecount(struct uvm_constraint_range* constraint) +{ + int lcv; + psize_t sz; + paddr_t low, high; + paddr_t ps_low, ps_high; + + /* Algorithm uses page numbers. */ + low = atop(constraint->ucr_low); + high = atop(constraint->ucr_high); + + sz = 0; + for (lcv = 0; lcv < vm_nphysseg; lcv++) { + ps_low = MAX(low, vm_physmem[lcv].avail_start); + ps_high = MIN(high, vm_physmem[lcv].avail_end); + if (ps_low < ps_high) + sz += ps_high - ps_low; + } + return sz; +} |