From owner-svn-src-projects@FreeBSD.ORG Mon Aug 18 16:08:07 2014 Return-Path: Delivered-To: svn-src-projects@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id D9382454; Mon, 18 Aug 2014 16:08:07 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id C501037B6; Mon, 18 Aug 2014 16:08:07 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id s7IG87bR054523; Mon, 18 Aug 2014 16:08:07 GMT (envelope-from cherry@FreeBSD.org) Received: (from cherry@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id s7IG8748054522; Mon, 18 Aug 2014 16:08:07 GMT (envelope-from cherry@FreeBSD.org) Message-Id: <201408181608.s7IG8748054522@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: cherry set sender to cherry@FreeBSD.org using -f From: "Cherry G. Mathew" Date: Mon, 18 Aug 2014 16:08:07 +0000 (UTC) To: src-committers@freebsd.org, svn-src-projects@freebsd.org Subject: svn commit: r270138 - projects/amd64_xen_pv/sys/amd64/include/xen X-SVN-Group: projects MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-projects@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "SVN commit messages for the src " projects" tree" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Aug 2014 16:08:07 -0000 Author: cherry Date: Mon Aug 18 16:08:07 2014 New Revision: 270138 URL: http://svnweb.freebsd.org/changeset/base/270138 Log: Add a "Compare and set" style support function. Approved by: gibbs (implicit) Modified: projects/amd64_xen_pv/sys/amd64/include/xen/xenpmap.h Modified: projects/amd64_xen_pv/sys/amd64/include/xen/xenpmap.h ============================================================================== --- projects/amd64_xen_pv/sys/amd64/include/xen/xenpmap.h Mon Aug 18 16:06:04 2014 (r270137) +++ projects/amd64_xen_pv/sys/amd64/include/xen/xenpmap.h Mon Aug 18 16:08:07 2014 (r270138) @@ -226,10 +226,12 @@ do { \ #define pde_store(pdep, pde) pte_store(pdep, pde) -static inline pt_entry_t pte_load_store(pt_entry_t *ptep, pt_entry_t npte) +static __inline pt_entry_t +pte_load_store(pt_entry_t *ptep, pt_entry_t npte) { pt_entry_t pte; + /* XXX: review for SMP */ pte = *ptep; pte_store(ptep, npte); @@ -245,6 +247,22 @@ static inline pt_entry_t pte_load_store( #define pte_load_clear(ptep) pte_load_store(ptep, 0); +static inline bool +pte_cmp_store(pt_entry_t *ptep, pt_entry_t oldpte, pt_entry_t newpte) +{ + /* XXX: locking for SMP */ + pt_entry_t tpte; + + tpte = *ptep; + + if (*ptep == oldpte) { + pte_store(ptep, newpte); + return true; + } + else { + return false; + } +} static __inline vm_paddr_t xpmap_mtop(vm_paddr_t mpa)