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[v8,03/13] arm/lpae: Introduce lpae_is_page helper

Message ID 20170809082038.3236-4-proskurin@sec.in.tum.de (mailing list archive)
State New, archived
Headers show

Commit Message

Sergej Proskurin Aug. 9, 2017, 8:20 a.m. UTC 
This commit introduces a new helper that checks whether the target PTE
holds a page mapping or not. This helper will be used as part of the
following commits.

Signed-off-by: Sergej Proskurin <proskurin@sec.in.tum.de>
Reviewed-by: Julien Grall <julien.grall@arm.com>
---
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Julien Grall <julien.grall@arm.com>
---
v6: Change the name of the lpae_page helper to lpae_is_page.

    Add Julien Grall's Reviewed-by.
---
 xen/include/asm-arm/lpae.h | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/xen/include/asm-arm/lpae.h b/xen/include/asm-arm/lpae.h
index efec493313..118ee5ae1a 100644
--- a/xen/include/asm-arm/lpae.h
+++ b/xen/include/asm-arm/lpae.h
@@ -153,6 +153,11 @@  static inline bool lpae_is_superpage(lpae_t pte, unsigned int level)
     return (level < 3) && lpae_mapping(pte);
 }
 
+static inline bool lpae_is_page(lpae_t pte, unsigned int level)
+{
+    return (level == 3) && lpae_valid(pte) && pte.walk.table;
+}
+
 /*
  * AArch64 supports pages with different sizes (4K, 16K, and 64K). To enable
  * page table walks for various configurations, the following helpers enable