1 files changed, 106 insertions, 0 deletions

diff --git a/include/asm-cris/arch-v10/mmu.h b/include/asm-cris/arch-v10/mmu.h
new file mode 100644
index 000000000000..d18aa00e50bc
--- /dev/null
+++ b/include/asm-cris/arch-v10/mmu.h
@@ -0,0 +1,106 @@
+/*
+ * CRIS MMU constants and PTE layout
+ */
+
+#ifndef _CRIS_ARCH_MMU_H
+#define _CRIS_ARCH_MMU_H
+
+/* type used in struct mm to couple an MMU context to an active mm */
+
+typedef unsigned int 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
+
+/* CRIS PTE bits (see R_TLB_LO in the register description)
+ *
+ *   Bit:  31-13 12-------4    3        2       1       0  
+ *         ________________________________________________
+ *        | pfn | reserved | global | valid | kernel | we  |
+ *        |_____|__________|________|_______|________|_____|
+ *
+ * (pfn = physical frame number)
+ */
+
+/* Real HW-based PTE bits. We use some synonym names so that
+ * things become less confusing in combination with the SW-based
+ * bits further below.
+ *
+ */
+
+#define _PAGE_WE           (1<<0) /* page is write-enabled */
+#define _PAGE_SILENT_WRITE (1<<0) /* synonym */
+#define _PAGE_KERNEL       (1<<1) /* page is kernel only */
+#define _PAGE_VALID        (1<<2) /* page is valid */
+#define _PAGE_SILENT_READ  (1<<2) /* synonym */
+#define _PAGE_GLOBAL       (1<<3) /* global page - context is ignored */
+
+/* Bits the HW doesn't care about but the kernel uses them in SW */
+
+#define _PAGE_PRESENT   (1<<4)  /* page present in memory */
+#define _PAGE_FILE      (1<<5)  /* set: pagecache, unset: swap (when !PRESENT) */
+#define _PAGE_ACCESSED  (1<<5)  /* simulated in software using valid bit */
+#define _PAGE_MODIFIED  (1<<6)  /* simulated in software using we bit */
+#define _PAGE_READ      (1<<7)  /* read-enabled */
+#define _PAGE_WRITE     (1<<8)  /* 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_COPY       __pgprot(_PAGE_PRESENT | __READABLE)  // | _PAGE_COW
+#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | __READABLE)
+#define PAGE_KERNEL     __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \
+                                 _PAGE_PRESENT | __READABLE | __WRITEABLE)
+#define _KERNPG_TABLE   (_PAGE_TABLE | _PAGE_KERNEL)
+
+/*
+ * CRIS can't do page protection for execute, and considers read the same.
+ * Also, write permissions imply read permissions. This is the closest we can
+ * get..
+ */
+
+#define __P000  PAGE_NONE
+#define __P001  PAGE_READONLY
+#define __P010  PAGE_COPY
+#define __P011  PAGE_COPY
+#define __P100  PAGE_READONLY
+#define __P101  PAGE_READONLY
+#define __P110  PAGE_COPY
+#define __P111  PAGE_COPY
+
+#define __S000  PAGE_NONE
+#define __S001  PAGE_READONLY
+#define __S010  PAGE_SHARED
+#define __S011  PAGE_SHARED
+#define __S100  PAGE_READONLY
+#define __S101  PAGE_READONLY
+#define __S110  PAGE_SHARED
+#define __S111  PAGE_SHARED
+
+#define PTE_FILE_MAX_BITS       26
+
+#endif