diff options
| author | Ariane van der Steldt <ariane@cvs.openbsd.org> | 2011-04-02 12:38:38 +0000 |
|---|---|---|
| committer | Ariane van der Steldt <ariane@cvs.openbsd.org> | 2011-04-02 12:38:38 +0000 |
| commit | 73d0ca48f3b21edc654d76563a7e9bcf845c06e3 (patch) | |
| tree | 8b6a72f87e3dc23bfd19cf8bd552f0453d81b6a5 /sys/uvm | |
| parent | 1f78efac1821c14469c471adc993a8948fdd373c (diff) | |
Count the number of physical pages within a memory range.
Bob needs this.
ok art@ bob@ thib@
Diffstat (limited to 'sys/uvm')
| -rw-r--r-- | sys/uvm/uvm_page.c | 27 | ||||
| -rw-r--r-- | sys/uvm/uvm_page.h | 5 |
2 files changed, 30 insertions, 2 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; +} diff --git a/sys/uvm/uvm_page.h b/sys/uvm/uvm_page.h index 8dc67d3f933..816278f8171 100644 --- a/sys/uvm/uvm_page.h +++ b/sys/uvm/uvm_page.h @@ -1,4 +1,4 @@ -/* $OpenBSD: uvm_page.h,v 1.44 2010/06/29 21:25:16 thib Exp $ */ +/* $OpenBSD: uvm_page.h,v 1.45 2011/04/02 12:38:37 ariane Exp $ */ /* $NetBSD: uvm_page.h,v 1.19 2000/12/28 08:24:55 chs Exp $ */ /* @@ -252,6 +252,9 @@ void uvm_pagezero(struct vm_page *); void uvm_pagealloc_pg(struct vm_page *, struct uvm_object *, voff_t, struct vm_anon *); +struct uvm_constraint_range; /* XXX move to uvm_extern.h? */ +psize_t uvm_pagecount(struct uvm_constraint_range*); + int uvm_page_lookup_freelist(struct vm_page *); #if VM_PHYSSEG_MAX == 1 |