| 1 | /*
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| 2 | * Copyright (C) 2003-2004 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef __mips32_TLB_H__
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| 30 | #define __mips32_TLB_H__
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| 31 |
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| 32 | #include <arch/exception.h>
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| 33 |
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| 34 | #define TLB_SIZE 48
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| 35 |
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| 36 | #define TLB_WIRED 1
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| 37 | #define TLB_KSTACK_WIRED_INDEX 0
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| 38 |
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| 39 | #define TLB_PAGE_MASK_16K (0x3<<13)
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| 40 |
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| 41 | #define PAGE_UNCACHED 2
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| 42 | #define PAGE_CACHEABLE_EXC_WRITE 5
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| 43 |
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| 44 | union entry_lo {
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| 45 | struct {
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| 46 | unsigned g : 1; /* global bit */
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| 47 | unsigned v : 1; /* valid bit */
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| 48 | unsigned d : 1; /* dirty/write-protect bit */
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| 49 | unsigned c : 3; /* cache coherency attribute */
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| 50 | unsigned pfn : 24; /* frame number */
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| 51 | unsigned zero: 2; /* zero */
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| 52 | } __attribute__ ((packed));
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| 53 | __u32 value;
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| 54 | };
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| 55 |
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| 56 | struct pte {
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| 57 | unsigned g : 1; /* global bit */
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| 58 | unsigned v : 1; /* valid bit */
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| 59 | unsigned d : 1; /* dirty/write-protect bit */
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| 60 | unsigned c : 3; /* cache coherency attribute */
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| 61 | unsigned pfn : 24; /* frame number */
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| 62 | unsigned w : 1; /* writable */
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| 63 | unsigned a : 1; /* accessed */
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| 64 | } __attribute__ ((packed));
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| 65 |
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| 66 | union entry_hi {
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| 67 | struct {
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| 68 | unsigned asid : 8;
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| 69 | unsigned : 5;
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| 70 | unsigned vpn2 : 19;
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| 71 | } __attribute__ ((packed));
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| 72 | __u32 value;
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| 73 | };
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| 74 |
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| 75 | union page_mask {
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| 76 | struct {
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| 77 | unsigned : 13;
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| 78 | unsigned mask : 12;
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| 79 | unsigned : 7;
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| 80 | } __attribute__ ((packed));
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| 81 | __u32 value;
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| 82 | };
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| 83 |
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| 84 | union index {
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| 85 | struct {
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| 86 | unsigned index : 4;
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| 87 | unsigned : 27;
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| 88 | unsigned p : 1;
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| 89 | } __attribute__ ((packed));
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| 90 | __u32 value;
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| 91 | };
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| 92 |
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| 93 | typedef union entry_lo entry_lo_t;
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| 94 | typedef union entry_hi entry_hi_t;
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| 95 | typedef union page_mask page_mask_t;
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| 96 | typedef union index tlb_index_t;
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| 97 |
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| 98 | /** Probe TLB for Matching Entry
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| 99 | *
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| 100 | * Probe TLB for Matching Entry.
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| 101 | */
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| 102 | static inline void tlbp(void)
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| 103 | {
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| 104 | __asm__ volatile ("tlbp\n\t");
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| 105 | }
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| 106 |
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| 107 |
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| 108 | /** Read Indexed TLB Entry
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| 109 | *
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| 110 | * Read Indexed TLB Entry.
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| 111 | */
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| 112 | static inline void tlbr(void)
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| 113 | {
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| 114 | __asm__ volatile ("tlbr\n\t");
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| 115 | }
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| 116 |
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| 117 | /** Write Indexed TLB Entry
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| 118 | *
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| 119 | * Write Indexed TLB Entry.
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| 120 | */
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| 121 | static inline void tlbwi(void)
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| 122 | {
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| 123 | __asm__ volatile ("tlbwi\n\t");
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| 124 | }
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| 125 |
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| 126 | /** Write Random TLB Entry
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| 127 | *
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| 128 | * Write Random TLB Entry.
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| 129 | */
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| 130 | static inline void tlbwr(void)
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| 131 | {
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| 132 | __asm__ volatile ("tlbwr\n\t");
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| 133 | }
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| 134 |
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| 135 | extern void tlb_invalid(struct exception_regdump *pstate);
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| 136 | extern void tlb_refill(struct exception_regdump *pstate);
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| 137 | extern void tlb_modified(struct exception_regdump *pstate);
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| 138 |
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| 139 | #endif
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