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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v8 04/13] arm/mem_access: Add short-descriptor pte typedefs and macros
The current implementation does not provide appropriate types for
short-descriptor translation table entries. As such, this commit adds new
types, which simplify managing the respective translation table entries.
Signed-off-by: Sergej Proskurin <proskurin@xxxxxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxx>
---
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
---
v3: Add more short-descriptor related pte typedefs that will be used by
the following commits.
v4: Move short-descriptor pte typedefs out of page.h into short-desc.h.
Change the type unsigned int to bool of every bitfield in
short-descriptor related data-structures that holds only one bit.
Change the typedef names from pte_sd_* to short_desc_*.
v5: Add {L1|L2}DESC_* defines to this commit.
v6: Add Julien Grall's Acked-by.
---
xen/include/asm-arm/short-desc.h | 130 +++++++++++++++++++++++++++++++++++++++
1 file changed, 130 insertions(+)
create mode 100644 xen/include/asm-arm/short-desc.h
diff --git a/xen/include/asm-arm/short-desc.h b/xen/include/asm-arm/short-desc.h
new file mode 100644
index 0000000000..9652a103c4
--- /dev/null
+++ b/xen/include/asm-arm/short-desc.h
@@ -0,0 +1,130 @@
+#ifndef __ARM_SHORT_DESC_H__
+#define __ARM_SHORT_DESC_H__
+
+/*
+ * First level translation table descriptor types used by the AArch32
+ * short-descriptor translation table format.
+ */
+#define L1DESC_INVALID (0)
+#define L1DESC_PAGE_TABLE (1)
+#define L1DESC_SECTION (2)
+#define L1DESC_SECTION_PXN (3)
+
+/* Defines for section and supersection shifts. */
+#define L1DESC_SECTION_SHIFT (20)
+#define L1DESC_SUPERSECTION_SHIFT (24)
+#define L1DESC_SUPERSECTION_EXT_BASE1_SHIFT (32)
+#define L1DESC_SUPERSECTION_EXT_BASE2_SHIFT (36)
+
+/* Second level translation table descriptor types. */
+#define L2DESC_INVALID (0)
+
+/* Defines for small (4K) and large page (64K) shifts. */
+#define L2DESC_SMALL_PAGE_SHIFT (12)
+#define L2DESC_LARGE_PAGE_SHIFT (16)
+
+/*
+ * Comprises bits of the level 1 short-descriptor format representing
+ * a section.
+ */
+typedef struct __packed {
+ bool pxn:1; /* Privileged Execute Never */
+ bool sec:1; /* == 1 if section or supersection */
+ bool b:1; /* Bufferable */
+ bool c:1; /* Cacheable */
+ bool xn:1; /* Execute Never */
+ unsigned int dom:4; /* Domain field */
+ bool impl:1; /* Implementation defined */
+ unsigned int ap:2; /* AP[1:0] */
+ unsigned int tex:3; /* TEX[2:0] */
+ bool ro:1; /* AP[2] */
+ bool s:1; /* Shareable */
+ bool ng:1; /* Non-global */
+ bool supersec:1; /* Must be 0 for sections */
+ bool ns:1; /* Non-secure */
+ unsigned int base:12; /* Section base address */
+} short_desc_l1_sec_t;
+
+/*
+ * Comprises bits of the level 1 short-descriptor format representing
+ * a supersection.
+ */
+typedef struct __packed {
+ bool pxn:1; /* Privileged Execute Never */
+ bool sec:1; /* == 1 if section or supersection */
+ bool b:1; /* Bufferable */
+ bool c:1; /* Cacheable */
+ bool xn:1; /* Execute Never */
+ unsigned int extbase2:4; /* Extended base address, PA[39:36] */
+ bool impl:1; /* Implementation defined */
+ unsigned int ap:2; /* AP[1:0] */
+ unsigned int tex:3; /* TEX[2:0] */
+ bool ro:1; /* AP[2] */
+ bool s:1; /* Shareable */
+ bool ng:1; /* Non-global */
+ bool supersec:1; /* Must be 0 for sections */
+ bool ns:1; /* Non-secure */
+ unsigned int extbase1:4; /* Extended base address, PA[35:32] */
+ unsigned int base:8; /* Supersection base address */
+} short_desc_l1_supersec_t;
+
+/*
+ * Comprises bits of the level 2 short-descriptor format representing
+ * a small page.
+ */
+typedef struct __packed {
+ bool xn:1; /* Execute Never */
+ bool page:1; /* ==1 if small page */
+ bool b:1; /* Bufferable */
+ bool c:1; /* Cacheable */
+ unsigned int ap:2; /* AP[1:0] */
+ unsigned int tex:3; /* TEX[2:0] */
+ bool ro:1; /* AP[2] */
+ bool s:1; /* Shareable */
+ bool ng:1; /* Non-global */
+ unsigned int base:20; /* Small page base address */
+} short_desc_l2_page_t;
+
+/*
+ * Comprises bits of the level 2 short-descriptor format representing
+ * a large page.
+ */
+typedef struct __packed {
+ bool lpage:1; /* ==1 if large page */
+ bool page:1; /* ==0 if large page */
+ bool b:1; /* Bufferable */
+ bool c:1; /* Cacheable */
+ unsigned int ap:2; /* AP[1:0] */
+ unsigned int sbz:3; /* Should be zero */
+ bool ro:1; /* AP[2] */
+ bool s:1; /* Shareable */
+ bool ng:1; /* Non-global */
+ unsigned int tex:3; /* TEX[2:0] */
+ bool xn:1; /* Execute Never */
+ unsigned int base:16; /* Large page base address */
+} short_desc_l2_lpage_t;
+
+/*
+ * Comprises the bits required to walk page tables adhering to the
+ * short-descriptor translation table format.
+ */
+typedef struct __packed {
+ unsigned int dt:2; /* Descriptor type */
+ unsigned int pad1:8;
+ unsigned int base:22; /* Base address of block or next table */
+} short_desc_walk_t;
+
+/*
+ * Represents page table entries adhering to the short-descriptor translation
+ * table format.
+ */
+typedef union {
+ uint32_t bits;
+ short_desc_walk_t walk;
+ short_desc_l1_sec_t sec;
+ short_desc_l1_supersec_t supersec;
+ short_desc_l2_page_t pg;
+ short_desc_l2_lpage_t lpg;
+} short_desc_t;
+
+#endif /* __ARM_SHORT_DESC_H__ */
--
2.13.3
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