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[7/9] arm/mpu: Introduce MPU memory mapping flags

Message ID 20250228161817.3342443-8-luca.fancellu@arm.com (mailing list archive)
State New
Headers show
Series First chunk for Arm R82 and MPU support | expand

Commit Message

Luca Fancellu Feb. 28, 2025, 4:18 p.m. UTC 
Introduce the MPU memory mapping flags in asm/page.h.

Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
 xen/arch/arm/include/asm/page.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
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Patch

diff --git a/xen/arch/arm/include/asm/page.h b/xen/arch/arm/include/asm/page.h
index 69f817d1e68a..22f7d2c6cb30 100644
--- a/xen/arch/arm/include/asm/page.h
+++ b/xen/arch/arm/include/asm/page.h
@@ -62,6 +62,7 @@ 
 
 #define MAIRVAL (MAIR1VAL << 32 | MAIR0VAL)
 
+#ifdef CONFIG_MMU
 /*
  * Layout of the flags used for updating the hypervisor page tables
  *
@@ -90,6 +91,30 @@ 
 #define _PAGE_CONTIG_BIT    8
 #define _PAGE_CONTIG        (1U << _PAGE_CONTIG_BIT)
 
+#else /* !CONFIG_MMU */
+
+/*
+ * Layout of the flags used for updating MPU memory region attributes
+ * [0:2] Memory attribute Index
+ * [3:4] Execute Never
+ * [5:6] Access Permission
+ * [7]   Region Present
+ */
+#define _PAGE_AI_BIT            0
+#define _PAGE_XN_BIT            3
+#define _PAGE_AP_BIT            5
+#define _PAGE_PRESENT_BIT       7
+#define _PAGE_AI                (7U << _PAGE_AI_BIT)
+#define _PAGE_XN                (2U << _PAGE_XN_BIT)
+#define _PAGE_RO                (2U << _PAGE_AP_BIT)
+#define _PAGE_PRESENT           (1U << _PAGE_PRESENT_BIT)
+#define PAGE_AI_MASK(x)         (((x) >> _PAGE_AI_BIT) & 0x7U)
+#define PAGE_XN_MASK(x)         (((x) >> _PAGE_XN_BIT) & 0x3U)
+#define PAGE_AP_MASK(x)         (((x) >> _PAGE_AP_BIT) & 0x3U)
+#define PAGE_RO_MASK(x)         (((x) >> _PAGE_AP_BIT) & 0x2U)
+
+#endif /* CONFIG_MMU */
+
 /*
  * _PAGE_DEVICE and _PAGE_NORMAL are convenience defines. They are not
  * meant to be used outside of this header.