[Xen-devel] [PATCH v3 09/16] xen/arm: Move LPAE definition in a separate header

[Julien Grall <julien.grall@xxxxxxx>]

page.h is getting bigger. Move out every LPAE definitions in a separate
header. There is no functional changes.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

---

Cc: proskurin@xxxxxxxxxxxxx

    Changes in v2:
        - Move comment after the #endif rather than before
        - Add Stefano's reviewed-by
---
 xen/include/asm-arm/lpae.h | 169 +++++++++++++++++++++++++++++++++++++++++++++
 xen/include/asm-arm/page.h | 152 +---------------------------------------
 2 files changed, 170 insertions(+), 151 deletions(-)
 create mode 100644 xen/include/asm-arm/lpae.h

diff --git a/xen/include/asm-arm/lpae.h b/xen/include/asm-arm/lpae.h
new file mode 100644
index 0000000000..ad8c571ea5
--- /dev/null
+++ b/xen/include/asm-arm/lpae.h
@@ -0,0 +1,169 @@
+#ifndef __ARM_LPAE_H__
+#define __ARM_LPAE_H__
+
+#ifndef __ASSEMBLY__
+
+/* WARNING!  Unlike the Intel pagetable code, where l1 is the lowest
+ * level and l4 is the root of the trie, the ARM pagetables follow ARM's
+ * documentation: the levels are called first, second &c in the order
+ * that the MMU walks them (i.e. "first" is the root of the trie). */
+
+/******************************************************************************
+ * ARMv7-A LPAE pagetables: 3-level trie, mapping 40-bit input to
+ * 40-bit output addresses.  Tables at all levels have 512 64-bit entries
+ * (i.e. are 4Kb long).
+ *
+ * The bit-shuffling that has the permission bits in branch nodes in a
+ * different place from those in leaf nodes seems to be to allow linear
+ * pagetable tricks.  If we're not doing that then the set of permission
+ * bits that's not in use in a given node type can be used as
+ * extra software-defined bits. */
+
+typedef struct __packed {
+    /* These are used in all kinds of entry. */
+    unsigned long valid:1;      /* Valid mapping */
+    unsigned long table:1;      /* == 1 in 4k map entries too */
+
+    /* These ten bits are only used in Block entries and are ignored
+     * in Table entries. */
+    unsigned long ai:3;         /* Attribute Index */
+    unsigned long ns:1;         /* Not-Secure */
+    unsigned long user:1;       /* User-visible */
+    unsigned long ro:1;         /* Read-Only */
+    unsigned long sh:2;         /* Shareability */
+    unsigned long af:1;         /* Access Flag */
+    unsigned long ng:1;         /* Not-Global */
+
+    /* The base address must be appropriately aligned for Block entries */
+    unsigned long long base:36; /* Base address of block or next table */
+    unsigned long sbz:4;        /* Must be zero */
+
+    /* These seven bits are only used in Block entries and are ignored
+     * in Table entries. */
+    unsigned long contig:1;     /* In a block of 16 contiguous entries */
+    unsigned long pxn:1;        /* Privileged-XN */
+    unsigned long xn:1;         /* eXecute-Never */
+    unsigned long avail:4;      /* Ignored by hardware */
+
+    /* These 5 bits are only used in Table entries and are ignored in
+     * Block entries */
+    unsigned long pxnt:1;       /* Privileged-XN */
+    unsigned long xnt:1;        /* eXecute-Never */
+    unsigned long apt:2;        /* Access Permissions */
+    unsigned long nst:1;        /* Not-Secure */
+} lpae_pt_t;
+
+/* The p2m tables have almost the same layout, but some of the permission
+ * and cache-control bits are laid out differently (or missing) */
+typedef struct __packed {
+    /* These are used in all kinds of entry. */
+    unsigned long valid:1;      /* Valid mapping */
+    unsigned long table:1;      /* == 1 in 4k map entries too */
+
+    /* These ten bits are only used in Block entries and are ignored
+     * in Table entries. */
+    unsigned long mattr:4;      /* Memory Attributes */
+    unsigned long read:1;       /* Read access */
+    unsigned long write:1;      /* Write access */
+    unsigned long sh:2;         /* Shareability */
+    unsigned long af:1;         /* Access Flag */
+    unsigned long sbz4:1;
+
+    /* The base address must be appropriately aligned for Block entries */
+    unsigned long long base:36; /* Base address of block or next table */
+    unsigned long sbz3:4;
+
+    /* These seven bits are only used in Block entries and are ignored
+     * in Table entries. */
+    unsigned long contig:1;     /* In a block of 16 contiguous entries */
+    unsigned long sbz2:1;
+    unsigned long xn:1;         /* eXecute-Never */
+    unsigned long type:4;       /* Ignore by hardware. Used to store p2m types 
*/
+
+    unsigned long sbz1:5;
+} lpae_p2m_t;
+
+/* Permission mask: xn, write, read */
+#define P2M_PERM_MASK (0x00400000000000C0ULL)
+#define P2M_CLEAR_PERM(pte) ((pte).bits & ~P2M_PERM_MASK)
+
+/*
+ * Walk is the common bits of p2m and pt entries which are needed to
+ * simply walk the table (e.g. for debug).
+ */
+typedef struct __packed {
+    /* These are used in all kinds of entry. */
+    unsigned long valid:1;      /* Valid mapping */
+    unsigned long table:1;      /* == 1 in 4k map entries too */
+
+    unsigned long pad2:10;
+
+    /* The base address must be appropriately aligned for Block entries */
+    unsigned long long base:36; /* Base address of block or next table */
+
+    unsigned long pad1:16;
+} lpae_walk_t;
+
+typedef union {
+    uint64_t bits;
+    lpae_pt_t pt;
+    lpae_p2m_t p2m;
+    lpae_walk_t walk;
+} lpae_t;
+
+#endif /* __ASSEMBLY__ */
+
+/*
+ * These numbers add up to a 48-bit input address space.
+ *
+ * On 32-bit the zeroeth level does not exist, therefore the total is
+ * 39-bits. The ARMv7-A architecture actually specifies a 40-bit input
+ * address space for the p2m, with an 8K (1024-entry) top-level table.
+ * However Xen only supports 16GB of RAM on 32-bit ARM systems and
+ * therefore 39-bits are sufficient.
+ */
+
+#define LPAE_SHIFT      9
+#define LPAE_ENTRIES    (_AC(1,U) << LPAE_SHIFT)
+#define LPAE_ENTRY_MASK (LPAE_ENTRIES - 1)
+
+#define THIRD_SHIFT    (PAGE_SHIFT)
+#define THIRD_ORDER    (THIRD_SHIFT - PAGE_SHIFT)
+#define THIRD_SIZE     ((paddr_t)1 << THIRD_SHIFT)
+#define THIRD_MASK     (~(THIRD_SIZE - 1))
+#define SECOND_SHIFT   (THIRD_SHIFT + LPAE_SHIFT)
+#define SECOND_ORDER   (SECOND_SHIFT - PAGE_SHIFT)
+#define SECOND_SIZE    ((paddr_t)1 << SECOND_SHIFT)
+#define SECOND_MASK    (~(SECOND_SIZE - 1))
+#define FIRST_SHIFT    (SECOND_SHIFT + LPAE_SHIFT)
+#define FIRST_ORDER    (FIRST_SHIFT - PAGE_SHIFT)
+#define FIRST_SIZE     ((paddr_t)1 << FIRST_SHIFT)
+#define FIRST_MASK     (~(FIRST_SIZE - 1))
+#define ZEROETH_SHIFT  (FIRST_SHIFT + LPAE_SHIFT)
+#define ZEROETH_ORDER  (ZEROETH_SHIFT - PAGE_SHIFT)
+#define ZEROETH_SIZE   ((paddr_t)1 << ZEROETH_SHIFT)
+#define ZEROETH_MASK   (~(ZEROETH_SIZE - 1))
+
+/* Calculate the offsets into the pagetables for a given VA */
+#define zeroeth_linear_offset(va) ((va) >> ZEROETH_SHIFT)
+#define first_linear_offset(va) ((va) >> FIRST_SHIFT)
+#define second_linear_offset(va) ((va) >> SECOND_SHIFT)
+#define third_linear_offset(va) ((va) >> THIRD_SHIFT)
+
+#define TABLE_OFFSET(offs) ((unsigned int)(offs) & LPAE_ENTRY_MASK)
+#define first_table_offset(va)  TABLE_OFFSET(first_linear_offset(va))
+#define second_table_offset(va) TABLE_OFFSET(second_linear_offset(va))
+#define third_table_offset(va)  TABLE_OFFSET(third_linear_offset(va))
+#define zeroeth_table_offset(va)  TABLE_OFFSET(zeroeth_linear_offset(va))
+
+#endif /* __ARM_LPAE_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-arm/page.h b/xen/include/asm-arm/page.h
index 3670ab665d..cef2f28914 100644
--- a/xen/include/asm-arm/page.h
+++ b/xen/include/asm-arm/page.h
@@ -3,6 +3,7 @@
 
 #include <public/xen.h>
 #include <asm/processor.h>
+#include <asm/lpae.h>
 
 #ifdef CONFIG_ARM_64
 #define PADDR_BITS              48
@@ -97,114 +98,6 @@
 #include <xen/lib.h>
 #include <asm/system.h>
 
-/* WARNING!  Unlike the Intel pagetable code, where l1 is the lowest
- * level and l4 is the root of the trie, the ARM pagetables follow ARM's
- * documentation: the levels are called first, second &c in the order
- * that the MMU walks them (i.e. "first" is the root of the trie). */
-
-/******************************************************************************
- * ARMv7-A LPAE pagetables: 3-level trie, mapping 40-bit input to
- * 40-bit output addresses.  Tables at all levels have 512 64-bit entries
- * (i.e. are 4Kb long).
- *
- * The bit-shuffling that has the permission bits in branch nodes in a
- * different place from those in leaf nodes seems to be to allow linear
- * pagetable tricks.  If we're not doing that then the set of permission
- * bits that's not in use in a given node type can be used as
- * extra software-defined bits. */
-
-typedef struct __packed {
-    /* These are used in all kinds of entry. */
-    unsigned long valid:1;      /* Valid mapping */
-    unsigned long table:1;      /* == 1 in 4k map entries too */
-
-    /* These ten bits are only used in Block entries and are ignored
-     * in Table entries. */
-    unsigned long ai:3;         /* Attribute Index */
-    unsigned long ns:1;         /* Not-Secure */
-    unsigned long user:1;       /* User-visible */
-    unsigned long ro:1;         /* Read-Only */
-    unsigned long sh:2;         /* Shareability */
-    unsigned long af:1;         /* Access Flag */
-    unsigned long ng:1;         /* Not-Global */
-
-    /* The base address must be appropriately aligned for Block entries */
-    unsigned long long base:36; /* Base address of block or next table */
-    unsigned long sbz:4;        /* Must be zero */
-
-    /* These seven bits are only used in Block entries and are ignored
-     * in Table entries. */
-    unsigned long contig:1;     /* In a block of 16 contiguous entries */
-    unsigned long pxn:1;        /* Privileged-XN */
-    unsigned long xn:1;         /* eXecute-Never */
-    unsigned long avail:4;      /* Ignored by hardware */
-
-    /* These 5 bits are only used in Table entries and are ignored in
-     * Block entries */
-    unsigned long pxnt:1;       /* Privileged-XN */
-    unsigned long xnt:1;        /* eXecute-Never */
-    unsigned long apt:2;        /* Access Permissions */
-    unsigned long nst:1;        /* Not-Secure */
-} lpae_pt_t;
-
-/* The p2m tables have almost the same layout, but some of the permission
- * and cache-control bits are laid out differently (or missing) */
-typedef struct __packed {
-    /* These are used in all kinds of entry. */
-    unsigned long valid:1;      /* Valid mapping */
-    unsigned long table:1;      /* == 1 in 4k map entries too */
-
-    /* These ten bits are only used in Block entries and are ignored
-     * in Table entries. */
-    unsigned long mattr:4;      /* Memory Attributes */
-    unsigned long read:1;       /* Read access */
-    unsigned long write:1;      /* Write access */
-    unsigned long sh:2;         /* Shareability */
-    unsigned long af:1;         /* Access Flag */
-    unsigned long sbz4:1;
-
-    /* The base address must be appropriately aligned for Block entries */
-    unsigned long long base:36; /* Base address of block or next table */
-    unsigned long sbz3:4;
-
-    /* These seven bits are only used in Block entries and are ignored
-     * in Table entries. */
-    unsigned long contig:1;     /* In a block of 16 contiguous entries */
-    unsigned long sbz2:1;
-    unsigned long xn:1;         /* eXecute-Never */
-    unsigned long type:4;       /* Ignore by hardware. Used to store p2m types 
*/
-
-    unsigned long sbz1:5;
-} lpae_p2m_t;
-
-/* Permission mask: xn, write, read */
-#define P2M_PERM_MASK (0x00400000000000C0ULL)
-#define P2M_CLEAR_PERM(pte) ((pte).bits & ~P2M_PERM_MASK)
-
-/*
- * Walk is the common bits of p2m and pt entries which are needed to
- * simply walk the table (e.g. for debug).
- */
-typedef struct __packed {
-    /* These are used in all kinds of entry. */
-    unsigned long valid:1;      /* Valid mapping */
-    unsigned long table:1;      /* == 1 in 4k map entries too */
-
-    unsigned long pad2:10;
-
-    /* The base address must be appropriately aligned for Block entries */
-    unsigned long long base:36; /* Base address of block or next table */
-
-    unsigned long pad1:16;
-} lpae_walk_t;
-
-typedef union {
-    uint64_t bits;
-    lpae_pt_t pt;
-    lpae_p2m_t p2m;
-    lpae_walk_t walk;
-} lpae_t;
-
 #if defined(CONFIG_ARM_32)
 # include <asm/arm32/page.h>
 #elif defined(CONFIG_ARM_64)
@@ -390,49 +283,6 @@ static inline int gva_to_ipa(vaddr_t va, paddr_t *paddr, 
unsigned int flags)
 
 #endif /* __ASSEMBLY__ */
 
-/*
- * These numbers add up to a 48-bit input address space.
- *
- * On 32-bit the zeroeth level does not exist, therefore the total is
- * 39-bits. The ARMv7-A architecture actually specifies a 40-bit input
- * address space for the p2m, with an 8K (1024-entry) top-level table.
- * However Xen only supports 16GB of RAM on 32-bit ARM systems and
- * therefore 39-bits are sufficient.
- */
-
-#define LPAE_SHIFT      9
-#define LPAE_ENTRIES    (_AC(1,U) << LPAE_SHIFT)
-#define LPAE_ENTRY_MASK (LPAE_ENTRIES - 1)
-
-#define THIRD_SHIFT    (PAGE_SHIFT)
-#define THIRD_ORDER    (THIRD_SHIFT - PAGE_SHIFT)
-#define THIRD_SIZE     ((paddr_t)1 << THIRD_SHIFT)
-#define THIRD_MASK     (~(THIRD_SIZE - 1))
-#define SECOND_SHIFT   (THIRD_SHIFT + LPAE_SHIFT)
-#define SECOND_ORDER   (SECOND_SHIFT - PAGE_SHIFT)
-#define SECOND_SIZE    ((paddr_t)1 << SECOND_SHIFT)
-#define SECOND_MASK    (~(SECOND_SIZE - 1))
-#define FIRST_SHIFT    (SECOND_SHIFT + LPAE_SHIFT)
-#define FIRST_ORDER    (FIRST_SHIFT - PAGE_SHIFT)
-#define FIRST_SIZE     ((paddr_t)1 << FIRST_SHIFT)
-#define FIRST_MASK     (~(FIRST_SIZE - 1))
-#define ZEROETH_SHIFT  (FIRST_SHIFT + LPAE_SHIFT)
-#define ZEROETH_ORDER  (ZEROETH_SHIFT - PAGE_SHIFT)
-#define ZEROETH_SIZE   ((paddr_t)1 << ZEROETH_SHIFT)
-#define ZEROETH_MASK   (~(ZEROETH_SIZE - 1))
-
-/* Calculate the offsets into the pagetables for a given VA */
-#define zeroeth_linear_offset(va) ((va) >> ZEROETH_SHIFT)
-#define first_linear_offset(va) ((va) >> FIRST_SHIFT)
-#define second_linear_offset(va) ((va) >> SECOND_SHIFT)
-#define third_linear_offset(va) ((va) >> THIRD_SHIFT)
-
-#define TABLE_OFFSET(offs) ((unsigned int)(offs) & LPAE_ENTRY_MASK)
-#define first_table_offset(va)  TABLE_OFFSET(first_linear_offset(va))
-#define second_table_offset(va) TABLE_OFFSET(second_linear_offset(va))
-#define third_table_offset(va)  TABLE_OFFSET(third_linear_offset(va))
-#define zeroeth_table_offset(va)  TABLE_OFFSET(zeroeth_linear_offset(va))
-
 #define PAGE_ALIGN(x) (((x) + PAGE_SIZE - 1) & PAGE_MASK)
 
 #endif /* __ARM_PAGE_H__ */
-- 
2.11.0


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