kernel/arch/sparc64/include/mm/tsb.h

   1 /*
   2  * Copyright (c) 2006 Jakub Jermar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup sparc64mm
  30  * @{
  31  */
  32 /** @file
  33  */
  34
  35 #ifndef KERN_sparc64_TSB_H_
  36 #define KERN_sparc64_TSB_H_
  37
  38 /*
  39  * ITSB abd DTSB will claim 64K of memory, which
  40  * is a nice number considered that it is one of
  41  * the page sizes supported by hardware, which,
  42  * again, is nice because TSBs need to be locked
  43  * in TLBs - only one TLB entry will do.
  44  */
  45 #define TSB_SIZE                        2       /* when changing this, change
  46                                                  * as.c as well */
  47 #define ITSB_ENTRY_COUNT                (512 * (1 << TSB_SIZE))
  48 #define DTSB_ENTRY_COUNT                (512 * (1 << TSB_SIZE))
  49
  50 #define TSB_TAG_TARGET_CONTEXT_SHIFT    48
  51
  52 #ifndef __ASM__
  53
  54 #include <arch/mm/tte.h>
  55 #include <arch/mm/mmu.h>
  56 #include <arch/types.h>
  57
  58 /** TSB Base register. */
  59 typedef union tsb_base_reg {
  60         uint64_t value;
  61         struct {
  62                 uint64_t base : 51;     /**< TSB base address, bits 63:13. */
  63                 unsigned split : 1;     /**< Split vs. common TSB for 8K and 64K
  64                                          * pages. HelenOS uses only 8K pages
  65                                          * for user mappings, so we always set
  66                                          * this to 0.
  67                                          */
  68                 unsigned : 9;
  69                 unsigned size : 3;      /**< TSB size. Number of entries is
  70                                          * 512 * 2^size. */
  71         } __attribute__ ((packed));
  72 } tsb_base_reg_t;
  73
  74 /** Read ITSB Base register.
  75  *
  76  * @return Content of the ITSB Base register.
  77  */
  78 static inline uint64_t itsb_base_read(void)
  79 {
  80         return asi_u64_read(ASI_IMMU, VA_IMMU_TSB_BASE);
  81 }
  82
  83 /** Read DTSB Base register.
  84  *
  85  * @return Content of the DTSB Base register.
  86  */
  87 static inline uint64_t dtsb_base_read(void)
  88 {
  89         return asi_u64_read(ASI_DMMU, VA_DMMU_TSB_BASE);
  90 }
  91
  92 /** Write ITSB Base register.
  93  *
  94  * @param v New content of the ITSB Base register.
  95  */
  96 static inline void itsb_base_write(uint64_t v)
  97 {
  98         asi_u64_write(ASI_IMMU, VA_IMMU_TSB_BASE, v);
  99 }
 100
 101 /** Write DTSB Base register.
 102  *
 103  * @param v New content of the DTSB Base register.
 104  */
 105 static inline void dtsb_base_write(uint64_t v)
 106 {
 107         asi_u64_write(ASI_DMMU, VA_DMMU_TSB_BASE, v);
 108 }
 109
 110 /* Forward declarations. */
 111 struct as;
 112 struct pte;
 113
 114 extern void tsb_invalidate(struct as *as, uintptr_t page, count_t pages);
 115 extern void itsb_pte_copy(struct pte *t);
 116 extern void dtsb_pte_copy(struct pte *t, bool ro);
 117
 118 #endif /* !def __ASM__ */
 119
 120 #endif
 121
 122 /** @}
 123  */