[PATCH v3 03/10] include: sbi: Add Smepmp specific access flags for PMP entries

[Himanshu Chauhan]

Smepmp specification defines a truth table based on which the access is allowed to
different modes. This patch adds different flags based on this truth table.

Signed-off-by: Himanshu Chauhan <hchauhan at ventanamicro.com>
Reviewed-by: Anup Patel <anup at brainfault.org>
---
 include/sbi/sbi_domain.h | 84 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 78 insertions(+), 6 deletions(-)

diff --git a/include/sbi/sbi_domain.h b/include/sbi/sbi_domain.h
index b05bcf4..da2a65a 100644
--- a/include/sbi/sbi_domain.h
+++ b/include/sbi/sbi_domain.h
@@ -43,6 +43,84 @@ struct sbi_domain_memregion {
 #define SBI_DOMAIN_MEMREGION_SU_WRITABLE	(1UL << 4)
 #define SBI_DOMAIN_MEMREGION_SU_EXECUTABLE	(1UL << 5)
 
+#define SBI_DOMAIN_MEMREGION_ACCESS_MASK	(0x3fUL)
+#define SBI_DOMAIN_MEMREGION_M_ACCESS_MASK	(0x7UL)
+#define SBI_DOMAIN_MEMREGION_SU_ACCESS_MASK	(0x38UL)
+
+#define SBI_DOMAIN_MEMREGION_SU_ACCESS_SHIFT	(3)
+
+#define SBI_DOMAIN_MEMREGION_SHARED_RDONLY		\
+		(SBI_DOMAIN_MEMREGION_M_READABLE |	\
+		 SBI_DOMAIN_MEMREGION_SU_READABLE)
+
+#define SBI_DOMAIN_MEMREGION_SHARED_SUX_MRX		\
+		(SBI_DOMAIN_MEMREGION_M_READABLE   |	\
+		 SBI_DOMAIN_MEMREGION_M_EXECUTABLE |	\
+		 SBI_DOMAIN_MEMREGION_SU_EXECUTABLE)
+
+#define SBI_DOMAIN_MEMREGION_SHARED_SUX_MX		\
+		(SBI_DOMAIN_MEMREGION_M_EXECUTABLE |	\
+		 SBI_DOMAIN_MEMREGION_SU_EXECUTABLE)
+
+#define SBI_DOMAIN_MEMREGION_SHARED_SURW_MRW		\
+		(SBI_DOMAIN_MEMREGION_M_READABLE |	\
+		 SBI_DOMAIN_MEMREGION_M_WRITABLE |	\
+		 SBI_DOMAIN_MEMREGION_SU_READABLE|	\
+		 SBI_DOMAIN_MEMREGION_SU_WRITABLE)
+
+#define SBI_DOMAIN_MEMREGION_SHARED_SUR_MRW		\
+		(SBI_DOMAIN_MEMREGION_M_READABLE |	\
+		 SBI_DOMAIN_MEMREGION_M_WRITABLE |	\
+		 SBI_DOMAIN_MEMREGION_SU_READABLE)
+
+	/* Shared read-only region between M and SU mode */
+#define SBI_DOMAIN_MEMREGION_IS_SUR_MR(__flags)			\
+		((__flags & SBI_DOMAIN_MEMREGION_M_READABLE) &&	\
+		 (__flags & SBI_DOMAIN_MEMREGION_SU_READABLE))
+
+	/* Shared region: SU execute-only and M read/execute */
+#define SBI_DOMAIN_MEMREGION_IS_SUX_MRX(__flags)			\
+		((__flags & SBI_DOMAIN_MEMREGION_M_READABLE) &&		\
+		 (__flags & SBI_DOMAIN_MEMREGION_M_EXECUTABLE) &&	\
+		 (__flags & SBI_DOMAIN_MEMREGION_SU_EXECUTABLE))
+
+	/* Shared region: SU and M execute-only */
+#define SBI_DOMAIN_MEMREGION_IS_SUX_MX(__flags)				\
+		((__flags & SBI_DOMAIN_MEMREGION_M_EXECUTABLE) &&	\
+		 (__flags & SBI_DOMAIN_MEMREGION_SU_EXECUTABLE))
+
+	/* Shared region: SU and M read/write */
+#define SBI_DOMAIN_MEMREGION_IS_SURW_MRW(__flags)		\
+		((__flags & SBI_DOMAIN_MEMREGION_M_READABLE) &&	\
+		 (__flags & SBI_DOMAIN_MEMREGION_M_WRITABLE) &&	\
+		 (__flags & SBI_DOMAIN_MEMREGION_SU_READABLE) &	\
+		 (__flags & SBI_DOMAIN_MEMREGION_SU_WRITABLE))
+
+	/* Shared region: SU read-only and M read/write */
+#define SBI_DOMAIN_MEMREGION_IS_SUR_MRW(__flags)		\
+		((__flags & SBI_DOMAIN_MEMREGION_M_READABLE) &&	\
+		 (__flags & SBI_DOMAIN_MEMREGION_M_WRITABLE) &&	\
+		 (__flags & SBI_DOMAIN_MEMREGION_SU_READABLE))
+
+	/*
+	 * Check if region flags match with any of the above
+	 * mentioned shared region type
+	 */
+#define SBI_DOMAIN_MEMREGION_IS_SHARED(_flags)			\
+		(SBI_DOMAIN_MEMREGION_IS_SUR_MR(_flags)  ||	\
+		 SBI_DOMAIN_MEMREGION_IS_SUX_MRX(_flags) ||	\
+		 SBI_DOMAIN_MEMREGION_IS_SUX_MX(_flags)  ||	\
+		 SBI_DOMAIN_MEMREGION_IS_SURW_MRW(_flags)||	\
+		 SBI_DOMAIN_MEMREGION_IS_SUR_MRW(_flags))
+
+#define SBI_DOMAIN_MEMREGION_M_ONLY_ACCESS(__flags)			\
+		((__flags & SBI_DOMAIN_MEMREGION_M_ACCESS_MASK) &&	\
+		 !(__flags & SBI_DOMAIN_MEMREGION_SU_ACCESS_MASK))
+
+#define SBI_DOMAIN_MEMREGION_SU_ONLY_ACCESS(__flags)			\
+		((__flags & SBI_DOMAIN_MEMREGION_SU_ACCESS_MASK)  &&	\
+		 !(__flags & SBI_DOMAIN_MEMREGION_M_ACCESS_MASK))
+
 /** Bit to control if permissions are enforced on all modes */
 #define SBI_DOMAIN_MEMREGION_ENF_PERMISSIONS	(1UL << 6)
 
@@ -78,12 +156,6 @@ struct sbi_domain_memregion {
 				(SBI_DOMAIN_MEMREGION_SU_EXECUTABLE | \
 				 SBI_DOMAIN_MEMREGION_M_EXECUTABLE)
 
-#define SBI_DOMAIN_MEMREGION_ACCESS_MASK	(0x3fUL)
-#define SBI_DOMAIN_MEMREGION_M_ACCESS_MASK	(0x7UL)
-#define SBI_DOMAIN_MEMREGION_SU_ACCESS_MASK	(0x38UL)
-
-#define SBI_DOMAIN_MEMREGION_SU_ACCESS_SHIFT	(3)
-
 #define SBI_DOMAIN_MEMREGION_MMIO		(1UL << 31)
 	unsigned long flags;
 };
-- 
2.34.1