1 files changed, 111 insertions, 0 deletions

diff --git a/include/asm-cris/arch-v32/mmu.h b/include/asm-cris/arch-v32/mmu.h
new file mode 100644
index 000000000000..6bcdc3fdf7dc
--- /dev/null
+++ b/include/asm-cris/arch-v32/mmu.h
@@ -0,0 +1,111 @@
+#ifndef _ASM_CRIS_ARCH_MMU_H
+#define _ASM_CRIS_ARCH_MMU_H
+
+/* MMU context type. */
+typedef struct
+{
+  unsigned int page_id;
+} mm_context_t;
+
+/* Kernel memory segments. */
+#define KSEG_F 0xf0000000UL
+#define KSEG_E 0xe0000000UL
+#define KSEG_D 0xd0000000UL
+#define KSEG_C 0xc0000000UL
+#define KSEG_B 0xb0000000UL
+#define KSEG_A 0xa0000000UL
+#define KSEG_9 0x90000000UL
+#define KSEG_8 0x80000000UL
+#define KSEG_7 0x70000000UL
+#define KSEG_6 0x60000000UL
+#define KSEG_5 0x50000000UL
+#define KSEG_4 0x40000000UL
+#define KSEG_3 0x30000000UL
+#define KSEG_2 0x20000000UL
+#define KSEG_1 0x10000000UL
+#define KSEG_0 0x00000000UL
+
+/*
+ * CRISv32 PTE bits:
+ *
+ *  Bit:  31-13  12-5     4        3       2        1        0
+ *       +-----+------+--------+-------+--------+-------+---------+
+ *       | pfn | zero | global | valid | kernel | write | execute |
+ *       +-----+------+--------+-------+--------+-------+---------+
+ */
+
+/*
+ * Defines for accessing the bits. Also define some synonyms for use with
+ * the software-based defined bits below.
+ */
+#define _PAGE_EXECUTE       (1 << 0)    /* Execution bit. */
+#define _PAGE_WE            (1 << 1)    /* Write bit. */
+#define _PAGE_SILENT_WRITE  (1 << 1)    /* Same as above. */
+#define _PAGE_KERNEL        (1 << 2)    /* Kernel mode page. */
+#define _PAGE_VALID         (1 << 3)    /* Page is valid. */
+#define _PAGE_SILENT_READ   (1 << 3)    /* Same as above. */
+#define _PAGE_GLOBAL        (1 << 4)    /* Global page. */
+
+/*
+ * The hardware doesn't care about these bits, but the kernel uses them in
+ * software.
+ */
+#define _PAGE_PRESENT   (1 << 5)   /* Page is present in memory. */
+#define _PAGE_FILE      (1 << 6)   /* 1=pagecache, 0=swap (when !present) */
+#define _PAGE_ACCESSED  (1 << 6)   /* Simulated in software using valid bit. */
+#define _PAGE_MODIFIED  (1 << 7)   /* Simulated in software using we bit. */
+#define _PAGE_READ      (1 << 8)   /* Read enabled. */
+#define _PAGE_WRITE     (1 << 9)   /* Write enabled. */
+
+/* Define some higher level generic page attributes. */
+#define __READABLE      (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED)
+#define __WRITEABLE     (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED)
+
+#define _PAGE_TABLE     (_PAGE_PRESENT | __READABLE | __WRITEABLE)
+#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED)
+
+#define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
+#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
+                                 _PAGE_ACCESSED)
+#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
+                                  _PAGE_ACCESSED | _PAGE_EXECUTE)
+
+#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | __READABLE)
+#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE | _PAGE_ACCESSED)
+
+#define PAGE_COPY       __pgprot(_PAGE_PRESENT | __READABLE)
+#define PAGE_COPY_EXEC  __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE)
+#define PAGE_KERNEL     __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \
+                                 _PAGE_PRESENT | __READABLE | __WRITEABLE)
+#define PAGE_KERNEL_EXEC __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | _PAGE_EXECUTE | \
+                                 _PAGE_PRESENT | __READABLE | __WRITEABLE)
+#define PAGE_SIGNAL_TRAMPOLINE __pgprot(_PAGE_GLOBAL | _PAGE_EXECUTE | \
+                                       _PAGE_PRESENT | __READABLE)
+
+#define _KERNPG_TABLE   (_PAGE_TABLE | _PAGE_KERNEL)
+
+/* CRISv32 can do page protection for execute.
+ * Write permissions imply read permissions.
+ * Note that the numbers are in Execute-Write-Read order!
+ */
+#define __P000  PAGE_NONE
+#define __P001  PAGE_READONLY
+#define __P010  PAGE_COPY
+#define __P011  PAGE_COPY
+#define __P100  PAGE_READONLY_EXEC
+#define __P101  PAGE_READONLY_EXEC
+#define __P110  PAGE_COPY_EXEC
+#define __P111  PAGE_COPY_EXEC
+
+#define __S000  PAGE_NONE
+#define __S001  PAGE_READONLY
+#define __S010  PAGE_SHARED
+#define __S011  PAGE_SHARED
+#define __S100  PAGE_READONLY_EXEC
+#define __S101  PAGE_READONLY_EXEC
+#define __S110  PAGE_SHARED_EXEC
+#define __S111  PAGE_SHARED_EXEC
+
+#define PTE_FILE_MAX_BITS       25
+
+#endif /* _ASM_CRIS_ARCH_MMU_H */