Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 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 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 14 | #ifdef __KERNEL__ |
| 15 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 16 | #include <linux/stringify.h> |
Chris Zankel | 173d668 | 2006-12-10 02:18:48 -0800 | [diff] [blame] | 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__ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 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 | |
| 45 | /* This is calld in munmap when we have freed up some page-table pages. |
| 46 | * We don't need to do anything here, there's nothing special about our |
| 47 | * page-table pages. |
| 48 | */ |
| 49 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 50 | static inline void flush_tlb_pgtables(struct mm_struct *mm, |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 51 | unsigned long start, unsigned long end) |
| 52 | { |
| 53 | } |
| 54 | |
| 55 | /* TLB operations. */ |
| 56 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 57 | static inline unsigned long itlb_probe(unsigned long addr) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 58 | { |
| 59 | unsigned long tmp; |
| 60 | __asm__ __volatile__("pitlb %0, %1\n\t" : "=a" (tmp) : "a" (addr)); |
| 61 | return tmp; |
| 62 | } |
| 63 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 64 | static inline unsigned long dtlb_probe(unsigned long addr) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 65 | { |
| 66 | unsigned long tmp; |
| 67 | __asm__ __volatile__("pdtlb %0, %1\n\t" : "=a" (tmp) : "a" (addr)); |
| 68 | return tmp; |
| 69 | } |
| 70 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 71 | static inline void invalidate_itlb_entry (unsigned long probe) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 72 | { |
| 73 | __asm__ __volatile__("iitlb %0; isync\n\t" : : "a" (probe)); |
| 74 | } |
| 75 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 76 | static inline void invalidate_dtlb_entry (unsigned long probe) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 77 | { |
| 78 | __asm__ __volatile__("idtlb %0; dsync\n\t" : : "a" (probe)); |
| 79 | } |
| 80 | |
| 81 | /* Use the .._no_isync functions with caution. Generally, these are |
| 82 | * handy for bulk invalidates followed by a single 'isync'. The |
| 83 | * caller must follow up with an 'isync', which can be relatively |
| 84 | * expensive on some Xtensa implementations. |
| 85 | */ |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 86 | static inline void invalidate_itlb_entry_no_isync (unsigned entry) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 87 | { |
| 88 | /* Caller must follow up with 'isync'. */ |
| 89 | __asm__ __volatile__ ("iitlb %0\n" : : "a" (entry) ); |
| 90 | } |
| 91 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 92 | static inline void invalidate_dtlb_entry_no_isync (unsigned entry) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 93 | { |
| 94 | /* Caller must follow up with 'isync'. */ |
| 95 | __asm__ __volatile__ ("idtlb %0\n" : : "a" (entry) ); |
| 96 | } |
| 97 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 98 | static inline void set_itlbcfg_register (unsigned long val) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 99 | { |
| 100 | __asm__ __volatile__("wsr %0, "__stringify(ITLBCFG)"\n\t" "isync\n\t" |
| 101 | : : "a" (val)); |
| 102 | } |
| 103 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 104 | static inline void set_dtlbcfg_register (unsigned long val) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 105 | { |
| 106 | __asm__ __volatile__("wsr %0, "__stringify(DTLBCFG)"; dsync\n\t" |
| 107 | : : "a" (val)); |
| 108 | } |
| 109 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 110 | static inline void set_ptevaddr_register (unsigned long val) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 111 | { |
| 112 | __asm__ __volatile__(" wsr %0, "__stringify(PTEVADDR)"; isync\n" |
| 113 | : : "a" (val)); |
| 114 | } |
| 115 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 116 | static inline unsigned long read_ptevaddr_register (void) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 117 | { |
| 118 | unsigned long tmp; |
| 119 | __asm__ __volatile__("rsr %0, "__stringify(PTEVADDR)"\n\t" : "=a" (tmp)); |
| 120 | return tmp; |
| 121 | } |
| 122 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 123 | static inline void write_dtlb_entry (pte_t entry, int way) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 124 | { |
| 125 | __asm__ __volatile__("wdtlb %1, %0; dsync\n\t" |
| 126 | : : "r" (way), "r" (entry) ); |
| 127 | } |
| 128 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 129 | static inline void write_itlb_entry (pte_t entry, int way) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 130 | { |
| 131 | __asm__ __volatile__("witlb %1, %0; isync\n\t" |
| 132 | : : "r" (way), "r" (entry) ); |
| 133 | } |
| 134 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 135 | static inline void invalidate_page_directory (void) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 136 | { |
Chris Zankel | 173d668 | 2006-12-10 02:18:48 -0800 | [diff] [blame] | 137 | invalidate_dtlb_entry (DTLB_WAY_PGD); |
| 138 | invalidate_dtlb_entry (DTLB_WAY_PGD+1); |
| 139 | invalidate_dtlb_entry (DTLB_WAY_PGD+2); |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 140 | } |
| 141 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 142 | static inline void invalidate_itlb_mapping (unsigned address) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 143 | { |
| 144 | unsigned long tlb_entry; |
Chris Zankel | 173d668 | 2006-12-10 02:18:48 -0800 | [diff] [blame] | 145 | if (((tlb_entry = itlb_probe(address)) & (1 << ITLB_HIT_BIT)) != 0) |
| 146 | invalidate_itlb_entry(tlb_entry); |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 147 | } |
| 148 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 149 | static inline void invalidate_dtlb_mapping (unsigned address) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 150 | { |
| 151 | unsigned long tlb_entry; |
Chris Zankel | 173d668 | 2006-12-10 02:18:48 -0800 | [diff] [blame] | 152 | if (((tlb_entry = dtlb_probe(address)) & (1 << DTLB_HIT_BIT)) != 0) |
| 153 | invalidate_dtlb_entry(tlb_entry); |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | #define check_pgt_cache() do { } while (0) |
| 157 | |
| 158 | |
Chris Zankel | 173d668 | 2006-12-10 02:18:48 -0800 | [diff] [blame] | 159 | /* |
| 160 | * DO NOT USE THESE FUNCTIONS. These instructions aren't part of the Xtensa |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 161 | * ISA and exist only for test purposes.. |
| 162 | * You may find it helpful for MMU debugging, however. |
| 163 | * |
| 164 | * 'at' is the unmodified input register |
| 165 | * 'as' is the output register, as follows (specific to the Linux config): |
| 166 | * |
| 167 | * as[31..12] contain the virtual address |
| 168 | * as[11..08] are meaningless |
| 169 | * as[07..00] contain the asid |
| 170 | */ |
| 171 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 172 | static inline unsigned long read_dtlb_virtual (int way) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 173 | { |
| 174 | unsigned long tmp; |
| 175 | __asm__ __volatile__("rdtlb0 %0, %1\n\t" : "=a" (tmp), "+a" (way)); |
| 176 | return tmp; |
| 177 | } |
| 178 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 179 | static inline unsigned long read_dtlb_translation (int way) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 180 | { |
| 181 | unsigned long tmp; |
| 182 | __asm__ __volatile__("rdtlb1 %0, %1\n\t" : "=a" (tmp), "+a" (way)); |
| 183 | return tmp; |
| 184 | } |
| 185 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 186 | static inline unsigned long read_itlb_virtual (int way) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 187 | { |
| 188 | unsigned long tmp; |
| 189 | __asm__ __volatile__("ritlb0 %0, %1\n\t" : "=a" (tmp), "+a" (way)); |
| 190 | return tmp; |
| 191 | } |
| 192 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 193 | static inline unsigned long read_itlb_translation (int way) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 194 | { |
| 195 | unsigned long tmp; |
| 196 | __asm__ __volatile__("ritlb1 %0, %1\n\t" : "=a" (tmp), "+a" (way)); |
| 197 | return tmp; |
| 198 | } |
| 199 | |
Chris Zankel | 173d668 | 2006-12-10 02:18:48 -0800 | [diff] [blame] | 200 | #endif /* __ASSEMBLY__ */ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 201 | #endif /* __KERNEL__ */ |
Chris Zankel | 173d668 | 2006-12-10 02:18:48 -0800 | [diff] [blame] | 202 | #endif /* _XTENSA_TLBFLUSH_H */ |