diff mbox

[for-4.8,v2,16/23] xen/arm: p2m: Introduce a helper to check if an entry is a superpage

Message ID 1473938919-31976-17-git-send-email-julien.grall@arm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Julien Grall Sept. 15, 2016, 11:28 a.m. UTC 
Use the level and the entry to know whether an entry is a superpage.
A superpage can only happen below level 3.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

---
    Changes in v2:
        - Use bool instead of bool_t
        - Add Stefano's reviewed-by
---
 xen/arch/arm/p2m.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox

Patch

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 9f0f896..3ca2e90 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -57,6 +57,11 @@  static inline bool_t p2m_mapping(lpae_t pte)
     return p2m_valid(pte) && !pte.p2m.table;
 }
 
+static inline bool p2m_is_superpage(lpae_t pte, unsigned int level)
+{
+    return (level < 3) && p2m_mapping(pte);
+}
+
 static inline void p2m_write_lock(struct p2m_domain *p2m)
 {
     write_lock(&p2m->lock);