arch/xtensa/include/asm/tlbflush.h

   1 /*
   2  * include/asm-xtensa/tlbflush.h
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2001 - 2005 Tensilica Inc.
   9  */
  10
  11 #ifndef _XTENSA_TLBFLUSH_H
  12 #define _XTENSA_TLBFLUSH_H
  13
  14 #ifdef __KERNEL__
  15
  16 #include <linux/stringify.h>
  17 #include <asm/processor.h>
  18
  19 #define DTLB_WAY_PGD    7
  20
  21 #define ITLB_ARF_WAYS   4
  22 #define DTLB_ARF_WAYS   4
  23
  24 #define ITLB_HIT_BIT    3
  25 #define DTLB_HIT_BIT    4
  26
  27 #ifndef __ASSEMBLY__
  28
  29 /* TLB flushing:
  30  *
  31  *  - flush_tlb_all() flushes all processes TLB entries
  32  *  - flush_tlb_mm(mm) flushes the specified mm context TLB entries
  33  *  - flush_tlb_page(mm, vmaddr) flushes a single page
  34  *  - flush_tlb_range(mm, start, end) flushes a range of pages
  35  */
  36
  37 extern void flush_tlb_all(void);
  38 extern void flush_tlb_mm(struct mm_struct*);
  39 extern void flush_tlb_page(struct vm_area_struct*,unsigned long);
  40 extern void flush_tlb_range(struct vm_area_struct*,unsigned long,unsigned long);
  41
  42 #define flush_tlb_kernel_range(start,end) flush_tlb_all()
  43
  44 /* TLB operations. */
  45
  46 static inline unsigned long itlb_probe(unsigned long addr)
  47 {
  48         unsigned long tmp;
  49         __asm__ __volatile__("pitlb  %0, %1\n\t" : "=a" (tmp) : "a" (addr));
  50         return tmp;
  51 }
  52
  53 static inline unsigned long dtlb_probe(unsigned long addr)
  54 {
  55         unsigned long tmp;
  56         __asm__ __volatile__("pdtlb  %0, %1\n\t" : "=a" (tmp) : "a" (addr));
  57         return tmp;
  58 }
  59
  60 static inline void invalidate_itlb_entry (unsigned long probe)
  61 {
  62         __asm__ __volatile__("iitlb  %0; isync\n\t" : : "a" (probe));
  63 }
  64
  65 static inline void invalidate_dtlb_entry (unsigned long probe)
  66 {
  67         __asm__ __volatile__("idtlb  %0; dsync\n\t" : : "a" (probe));
  68 }
  69
  70 /* Use the .._no_isync functions with caution.  Generally, these are
  71  * handy for bulk invalidates followed by a single 'isync'.  The
  72  * caller must follow up with an 'isync', which can be relatively
  73  * expensive on some Xtensa implementations.
  74  */
  75 static inline void invalidate_itlb_entry_no_isync (unsigned entry)
  76 {
  77         /* Caller must follow up with 'isync'. */
  78         __asm__ __volatile__ ("iitlb  %0\n" : : "a" (entry) );
  79 }
  80
  81 static inline void invalidate_dtlb_entry_no_isync (unsigned entry)
  82 {
  83         /* Caller must follow up with 'isync'. */
  84         __asm__ __volatile__ ("idtlb  %0\n" : : "a" (entry) );
  85 }
  86
  87 static inline void set_itlbcfg_register (unsigned long val)
  88 {
  89         __asm__ __volatile__("wsr  %0, "__stringify(ITLBCFG)"\n\t" "isync\n\t"
  90                              : : "a" (val));
  91 }
  92
  93 static inline void set_dtlbcfg_register (unsigned long val)
  94 {
  95         __asm__ __volatile__("wsr  %0, "__stringify(DTLBCFG)"; dsync\n\t"
  96                              : : "a" (val));
  97 }
  98
  99 static inline void set_ptevaddr_register (unsigned long val)
 100 {
 101         __asm__ __volatile__(" wsr  %0, "__stringify(PTEVADDR)"; isync\n"
 102                              : : "a" (val));
 103 }
 104
 105 static inline unsigned long read_ptevaddr_register (void)
 106 {
 107         unsigned long tmp;
 108         __asm__ __volatile__("rsr  %0, "__stringify(PTEVADDR)"\n\t" : "=a" (tmp));
 109         return tmp;
 110 }
 111
 112 static inline void write_dtlb_entry (pte_t entry, int way)
 113 {
 114         __asm__ __volatile__("wdtlb  %1, %0; dsync\n\t"
 115                              : : "r" (way), "r" (entry) );
 116 }
 117
 118 static inline void write_itlb_entry (pte_t entry, int way)
 119 {
 120         __asm__ __volatile__("witlb  %1, %0; isync\n\t"
 121                              : : "r" (way), "r" (entry) );
 122 }
 123
 124 static inline void invalidate_page_directory (void)
 125 {
 126         invalidate_dtlb_entry (DTLB_WAY_PGD);
 127         invalidate_dtlb_entry (DTLB_WAY_PGD+1);
 128         invalidate_dtlb_entry (DTLB_WAY_PGD+2);
 129 }
 130
 131 static inline void invalidate_itlb_mapping (unsigned address)
 132 {
 133         unsigned long tlb_entry;
 134         if (((tlb_entry = itlb_probe(address)) & (1 << ITLB_HIT_BIT)) != 0)
 135                 invalidate_itlb_entry(tlb_entry);
 136 }
 137
 138 static inline void invalidate_dtlb_mapping (unsigned address)
 139 {
 140         unsigned long tlb_entry;
 141         if (((tlb_entry = dtlb_probe(address)) & (1 << DTLB_HIT_BIT)) != 0)
 142                 invalidate_dtlb_entry(tlb_entry);
 143 }
 144
 145 #define check_pgt_cache()       do { } while (0)
 146
 147
 148 /*
 149  * DO NOT USE THESE FUNCTIONS.  These instructions aren't part of the Xtensa
 150  * ISA and exist only for test purposes..
 151  * You may find it helpful for MMU debugging, however.
 152  *
 153  * 'at' is the unmodified input register
 154  * 'as' is the output register, as follows (specific to the Linux config):
 155  *
 156  *      as[31..12] contain the virtual address
 157  *      as[11..08] are meaningless
 158  *      as[07..00] contain the asid
 159  */
 160
 161 static inline unsigned long read_dtlb_virtual (int way)
 162 {
 163         unsigned long tmp;
 164         __asm__ __volatile__("rdtlb0  %0, %1\n\t" : "=a" (tmp), "+a" (way));
 165         return tmp;
 166 }
 167
 168 static inline unsigned long read_dtlb_translation (int way)
 169 {
 170         unsigned long tmp;
 171         __asm__ __volatile__("rdtlb1  %0, %1\n\t" : "=a" (tmp), "+a" (way));
 172         return tmp;
 173 }
 174
 175 static inline unsigned long read_itlb_virtual (int way)
 176 {
 177         unsigned long tmp;
 178         __asm__ __volatile__("ritlb0  %0, %1\n\t" : "=a" (tmp), "+a" (way));
 179         return tmp;
 180 }
 181
 182 static inline unsigned long read_itlb_translation (int way)
 183 {
 184         unsigned long tmp;
 185         __asm__ __volatile__("ritlb1  %0, %1\n\t" : "=a" (tmp), "+a" (way));
 186         return tmp;
 187 }
 188
 189 #endif  /* __ASSEMBLY__ */
 190 #endif  /* __KERNEL__ */
 191 #endif  /* _XTENSA_TLBFLUSH_H */