Date: Mon, 18 Aug 2014 16:08:07 +0000 (UTC) From: "Cherry G. Mathew" <cherry@FreeBSD.org> To: src-committers@freebsd.org, svn-src-projects@freebsd.org Subject: svn commit: r270138 - projects/amd64_xen_pv/sys/amd64/include/xen Message-ID: <201408181608.s7IG8748054522@svn.freebsd.org>
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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)
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