1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2001 - 2013 Tensilica Inc. 7 */ 8 9 #ifndef _XTENSA_TLBFLUSH_H 10 #define _XTENSA_TLBFLUSH_H 11 12 #include <linux/stringify.h> 13 #include <asm/processor.h> 14 15 #define DTLB_WAY_PGD 7 16 17 #define ITLB_ARF_WAYS 4 18 #define DTLB_ARF_WAYS 4 19 20 #define ITLB_HIT_BIT 3 21 #define DTLB_HIT_BIT 4 22 23 #ifndef __ASSEMBLY__ 24 25 /* TLB flushing: 26 * 27 * - flush_tlb_all() flushes all processes TLB entries 28 * - flush_tlb_mm(mm) flushes the specified mm context TLB entries 29 * - flush_tlb_page(mm, vmaddr) flushes a single page 30 * - flush_tlb_range(mm, start, end) flushes a range of pages 31 */ 32 33 void local_flush_tlb_all(void); 34 void local_flush_tlb_mm(struct mm_struct *mm); 35 void local_flush_tlb_page(struct vm_area_struct *vma, 36 unsigned long page); 37 void local_flush_tlb_range(struct vm_area_struct *vma, 38 unsigned long start, unsigned long end); 39 void local_flush_tlb_kernel_range(unsigned long start, unsigned long end); 40 41 #ifdef CONFIG_SMP 42 43 void flush_tlb_all(void); 44 void flush_tlb_mm(struct mm_struct *); 45 void flush_tlb_page(struct vm_area_struct *, unsigned long); 46 void flush_tlb_range(struct vm_area_struct *, unsigned long, 47 unsigned long); 48 void flush_tlb_kernel_range(unsigned long start, unsigned long end); 49 50 #else /* !CONFIG_SMP */ 51 52 #define flush_tlb_all() local_flush_tlb_all() 53 #define flush_tlb_mm(mm) local_flush_tlb_mm(mm) 54 #define flush_tlb_page(vma, page) local_flush_tlb_page(vma, page) 55 #define flush_tlb_range(vma, vmaddr, end) local_flush_tlb_range(vma, vmaddr, \ 56 end) 57 #define flush_tlb_kernel_range(start, end) local_flush_tlb_kernel_range(start, \ 58 end) 59 60 #endif /* CONFIG_SMP */ 61 62 /* TLB operations. */ 63 64 static inline unsigned long itlb_probe(unsigned long addr) 65 { 66 unsigned long tmp; 67 __asm__ __volatile__("pitlb %0, %1\n\t" : "=a" (tmp) : "a" (addr)); 68 return tmp; 69 } 70 71 static inline unsigned long dtlb_probe(unsigned long addr) 72 { 73 unsigned long tmp; 74 __asm__ __volatile__("pdtlb %0, %1\n\t" : "=a" (tmp) : "a" (addr)); 75 return tmp; 76 } 77 78 static inline void invalidate_itlb_entry (unsigned long probe) 79 { 80 __asm__ __volatile__("iitlb %0; isync\n\t" : : "a" (probe)); 81 } 82 83 static inline void invalidate_dtlb_entry (unsigned long probe) 84 { 85 __asm__ __volatile__("idtlb %0; dsync\n\t" : : "a" (probe)); 86 } 87 88 /* Use the .._no_isync functions with caution. Generally, these are 89 * handy for bulk invalidates followed by a single 'isync'. The 90 * caller must follow up with an 'isync', which can be relatively 91 * expensive on some Xtensa implementations. 92 */ 93 static inline void invalidate_itlb_entry_no_isync (unsigned entry) 94 { 95 /* Caller must follow up with 'isync'. */ 96 __asm__ __volatile__ ("iitlb %0\n" : : "a" (entry) ); 97 } 98 99 static inline void invalidate_dtlb_entry_no_isync (unsigned entry) 100 { 101 /* Caller must follow up with 'isync'. */ 102 __asm__ __volatile__ ("idtlb %0\n" : : "a" (entry) ); 103 } 104 105 static inline void set_itlbcfg_register (unsigned long val) 106 { 107 __asm__ __volatile__("wsr %0, itlbcfg\n\t" "isync\n\t" 108 : : "a" (val)); 109 } 110 111 static inline void set_dtlbcfg_register (unsigned long val) 112 { 113 __asm__ __volatile__("wsr %0, dtlbcfg; dsync\n\t" 114 : : "a" (val)); 115 } 116 117 static inline void set_ptevaddr_register (unsigned long val) 118 { 119 __asm__ __volatile__(" wsr %0, ptevaddr; isync\n" 120 : : "a" (val)); 121 } 122 123 static inline unsigned long read_ptevaddr_register (void) 124 { 125 unsigned long tmp; 126 __asm__ __volatile__("rsr %0, ptevaddr\n\t" : "=a" (tmp)); 127 return tmp; 128 } 129 130 static inline void write_dtlb_entry (pte_t entry, int way) 131 { 132 __asm__ __volatile__("wdtlb %1, %0; dsync\n\t" 133 : : "r" (way), "r" (entry) ); 134 } 135 136 static inline void write_itlb_entry (pte_t entry, int way) 137 { 138 __asm__ __volatile__("witlb %1, %0; isync\n\t" 139 : : "r" (way), "r" (entry) ); 140 } 141 142 static inline void invalidate_page_directory (void) 143 { 144 invalidate_dtlb_entry (DTLB_WAY_PGD); 145 invalidate_dtlb_entry (DTLB_WAY_PGD+1); 146 invalidate_dtlb_entry (DTLB_WAY_PGD+2); 147 } 148 149 static inline void invalidate_itlb_mapping (unsigned address) 150 { 151 unsigned long tlb_entry; 152 if (((tlb_entry = itlb_probe(address)) & (1 << ITLB_HIT_BIT)) != 0) 153 invalidate_itlb_entry(tlb_entry); 154 } 155 156 static inline void invalidate_dtlb_mapping (unsigned address) 157 { 158 unsigned long tlb_entry; 159 if (((tlb_entry = dtlb_probe(address)) & (1 << DTLB_HIT_BIT)) != 0) 160 invalidate_dtlb_entry(tlb_entry); 161 } 162 163 #define check_pgt_cache() do { } while (0) 164 165 166 /* 167 * DO NOT USE THESE FUNCTIONS. These instructions aren't part of the Xtensa 168 * ISA and exist only for test purposes.. 169 * You may find it helpful for MMU debugging, however. 170 * 171 * 'at' is the unmodified input register 172 * 'as' is the output register, as follows (specific to the Linux config): 173 * 174 * as[31..12] contain the virtual address 175 * as[11..08] are meaningless 176 * as[07..00] contain the asid 177 */ 178 179 static inline unsigned long read_dtlb_virtual (int way) 180 { 181 unsigned long tmp; 182 __asm__ __volatile__("rdtlb0 %0, %1\n\t" : "=a" (tmp), "+a" (way)); 183 return tmp; 184 } 185 186 static inline unsigned long read_dtlb_translation (int way) 187 { 188 unsigned long tmp; 189 __asm__ __volatile__("rdtlb1 %0, %1\n\t" : "=a" (tmp), "+a" (way)); 190 return tmp; 191 } 192 193 static inline unsigned long read_itlb_virtual (int way) 194 { 195 unsigned long tmp; 196 __asm__ __volatile__("ritlb0 %0, %1\n\t" : "=a" (tmp), "+a" (way)); 197 return tmp; 198 } 199 200 static inline unsigned long read_itlb_translation (int way) 201 { 202 unsigned long tmp; 203 __asm__ __volatile__("ritlb1 %0, %1\n\t" : "=a" (tmp), "+a" (way)); 204 return tmp; 205 } 206 207 #endif /* __ASSEMBLY__ */ 208 #endif /* _XTENSA_TLBFLUSH_H */ 209