1 files changed, 102 insertions, 2 deletions

diff --git a/arch/microblaze/include/asm/mmu.h b/arch/microblaze/include/asm/mmu.h
index 0e0431d61635..66cad6a99d77 100644
--- a/arch/microblaze/include/asm/mmu.h
+++ b/arch/microblaze/include/asm/mmu.h
@@ -1,4 +1,6 @@
 /*
+ * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2008-2009 PetaLogix
  * Copyright (C) 2006 Atmark Techno, Inc.
  *
  * This file is subject to the terms and conditions of the GNU General Public
@@ -9,11 +11,109 @@
 #ifndef _ASM_MICROBLAZE_MMU_H
 #define _ASM_MICROBLAZE_MMU_H
 
-#ifndef __ASSEMBLY__
+# ifndef CONFIG_MMU
+#  ifndef __ASSEMBLY__
 typedef struct {
         struct vm_list_struct   *vmlist;
         unsigned long           end_brk;
 } mm_context_t;
-#endif /* __ASSEMBLY__ */
+#  endif /* __ASSEMBLY__ */
+# else /* CONFIG_MMU */
+#  ifdef __KERNEL__
+#   ifndef __ASSEMBLY__
 
+/* Default "unsigned long" context */
+typedef unsigned long mm_context_t;
+
+/* Hardware Page Table Entry */
+typedef struct _PTE {
+        unsigned long    v:1;   /* Entry is valid */
+        unsigned long vsid:24;  /* Virtual segment identifier */
+        unsigned long    h:1;   /* Hash algorithm indicator */
+        unsigned long  api:6;   /* Abbreviated page index */
+        unsigned long  rpn:20;  /* Real (physical) page number */
+        unsigned long     :3;   /* Unused */
+        unsigned long    r:1;   /* Referenced */
+        unsigned long    c:1;   /* Changed */
+        unsigned long    w:1;   /* Write-thru cache mode */
+        unsigned long    i:1;   /* Cache inhibited */
+        unsigned long    m:1;   /* Memory coherence */
+        unsigned long    g:1;   /* Guarded */
+        unsigned long     :1;   /* Unused */
+        unsigned long   pp:2;   /* Page protection */
+} PTE;
+
+/* Values for PP (assumes Ks=0, Kp=1) */
+#  define PP_RWXX       0 /* Supervisor read/write, User none */
+#  define PP_RWRX       1 /* Supervisor read/write, User read */
+#  define PP_RWRW       2 /* Supervisor read/write, User read/write */
+#  define PP_RXRX       3 /* Supervisor read,       User read */
+
+/* Segment Register */
+typedef struct _SEGREG {
+        unsigned long    t:1;   /* Normal or I/O  type */
+        unsigned long   ks:1;   /* Supervisor 'key' (normally 0) */
+        unsigned long   kp:1;   /* User 'key' (normally 1) */
+        unsigned long    n:1;   /* No-execute */
+        unsigned long     :4;   /* Unused */
+        unsigned long vsid:24;  /* Virtual Segment Identifier */
+} SEGREG;
+
+extern void _tlbie(unsigned long va);   /* invalidate a TLB entry */
+extern void _tlbia(void);               /* invalidate all TLB entries */
+#   endif /* __ASSEMBLY__ */
+
+/*
+ * The MicroBlaze processor has a TLB architecture identical to PPC-40x. The
+ * instruction and data sides share a unified, 64-entry, semi-associative
+ * TLB which is maintained totally under software control. In addition, the
+ * instruction side has a hardware-managed, 2,4, or 8-entry, fully-associative
+ * TLB which serves as a first level to the shared TLB. These two TLBs are
+ * known as the UTLB and ITLB, respectively.
+ */
+
+#  define MICROBLAZE_TLB_SIZE 64
+
+/*
+ * TLB entries are defined by a "high" tag portion and a "low" data
+ * portion. The data portion is 32-bits.
+ *
+ * TLB entries are managed entirely under software control by reading,
+ * writing, and searching using the MTS and MFS instructions.
+ */
+
+#  define TLB_LO                1
+#  define TLB_HI                0
+#  define TLB_DATA              TLB_LO
+#  define TLB_TAG               TLB_HI
+
+/* Tag portion */
+#  define TLB_EPN_MASK          0xFFFFFC00 /* Effective Page Number */
+#  define TLB_PAGESZ_MASK       0x00000380
+#  define TLB_PAGESZ(x)         (((x) & 0x7) << 7)
+#  define PAGESZ_1K             0
+#  define PAGESZ_4K             1
+#  define PAGESZ_16K            2
+#  define PAGESZ_64K            3
+#  define PAGESZ_256K           4
+#  define PAGESZ_1M             5
+#  define PAGESZ_4M             6
+#  define PAGESZ_16M            7
+#  define TLB_VALID             0x00000040 /* Entry is valid */
+
+/* Data portion */
+#  define TLB_RPN_MASK          0xFFFFFC00 /* Real Page Number */
+#  define TLB_PERM_MASK         0x00000300
+#  define TLB_EX                0x00000200 /* Instruction execution allowed */
+#  define TLB_WR                0x00000100 /* Writes permitted */
+#  define TLB_ZSEL_MASK         0x000000F0
+#  define TLB_ZSEL(x)           (((x) & 0xF) << 4)
+#  define TLB_ATTR_MASK         0x0000000F
+#  define TLB_W                 0x00000008 /* Caching is write-through */
+#  define TLB_I                 0x00000004 /* Caching is inhibited */
+#  define TLB_M                 0x00000002 /* Memory is coherent */
+#  define TLB_G                 0x00000001 /* Memory is guarded from prefetch */
+
+#  endif /* __KERNEL__ */
+# endif /* CONFIG_MMU */
 #endif /* _ASM_MICROBLAZE_MMU_H */