Date: Fri, 23 Mar 2007 12:56:39 GMT From: Oleksandr Tymoshenko <gonzo@FreeBSD.org> To: Perforce Change Reviews <perforce@FreeBSD.org> Subject: PERFORCE change 116413 for review Message-ID: <200703231256.l2NCudh0063317@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=116413 Change 116413 by gonzo@gonzo_jeeves on 2007/03/23 12:56:32 o Implement pmap_page_protect. Affected files ... .. //depot/projects/mips2/src/sys/mips/mips/pmap.c#24 edit Differences ... ==== //depot/projects/mips2/src/sys/mips/mips/pmap.c#24 (text+ko) ==== @@ -1575,12 +1575,31 @@ void pmap_page_protect(vm_page_t m, vm_prot_t prot) { + pv_entry_t pv, npv; + vm_offset_t va; + pt_entry_t *pte; + /* * Consider only readonly case */ if ((prot & VM_PROT_WRITE) == 0) { if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { - panic("pmap_page_protect unimplemented\n"); + /* + * Loop over all current mappings + * setting/clearing as appropos. + */ + for(pv = TAILQ_FIRST(&m->md.pv_list); pv; pv = npv) { + npv = TAILQ_NEXT(pv, pv_plist); + pte = pmap_pte(pv->pv_pmap, pv->pv_va); + + if ((pte == NULL) || !pte_valid(pte)) + panic("page on pm_pvlist has no pte\n"); + + va = pv->pv_va; + pmap_protect(pv->pv_pmap, va, va + PAGE_SIZE, + prot); + + } } else { pmap_remove_all(m); }
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