[Xen-changelog] [xen master] arm/mem_access: Add short-descriptor pte typedefs and macros

[patchbot@xxxxxxx]

commit 9d520d171c64940ee8a42d894697ce88ca1679b5
Author:     Sergej Proskurin <proskurin@xxxxxxxxxxxxx>
AuthorDate: Wed Aug 16 15:17:35 2017 +0200
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Fri Aug 18 10:27:25 2017 -0700

    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>
    Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/include/asm-arm/short-desc.h | 130 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)

diff --git a/xen/include/asm-arm/short-desc.h b/xen/include/asm-arm/short-desc.h
new file mode 100644
index 0000000..9652a10
--- /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__ */
--
generated by git-patchbot for /home/xen/git/xen.git#master

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxx
https://lists.xenproject.org/xen-changelog