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864 | jermar | 1 | /* |
2 | * Copyright (C) 2006 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 | |||
1703 | jermar | 29 | /** @addtogroup sparc64interrupt |
1702 | cejka | 30 | * @{ |
31 | */ |
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864 | jermar | 32 | /** |
1703 | jermar | 33 | * @file |
34 | * @brief This file contains fast MMU trap handlers. |
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864 | jermar | 35 | */ |
36 | |||
1859 | jermar | 37 | #ifndef KERN_sparc64_MMU_TRAP_H_ |
38 | #define KERN_sparc64_MMU_TRAP_H_ |
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864 | jermar | 39 | |
883 | jermar | 40 | #include <arch/stack.h> |
1852 | jermar | 41 | #include <arch/regdef.h> |
1851 | jermar | 42 | #include <arch/mm/tlb.h> |
43 | #include <arch/mm/mmu.h> |
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44 | #include <arch/mm/tte.h> |
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883 | jermar | 45 | |
864 | jermar | 46 | #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64 |
47 | #define TT_FAST_DATA_ACCESS_MMU_MISS 0x68 |
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48 | #define TT_FAST_DATA_ACCESS_PROTECTION 0x6c |
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49 | |||
50 | #define FAST_MMU_HANDLER_SIZE 128 |
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51 | |||
867 | jermar | 52 | #ifdef __ASM__ |
864 | jermar | 53 | .macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER |
1859 | jermar | 54 | /* |
55 | * First, try to refill TLB from TSB. |
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56 | */ |
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57 | ! TODO |
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58 | |||
59 | wrpr %g0, PSTATE_PRIV_BIT | PSTATE_AG_BIT, %pstate |
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60 | PREEMPTIBLE_HANDLER fast_instruction_access_mmu_miss |
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864 | jermar | 61 | .endm |
62 | |||
63 | .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER |
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1851 | jermar | 64 | /* |
1852 | jermar | 65 | * First, try to refill TLB from TSB. |
66 | */ |
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67 | ! TODO |
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68 | |||
69 | /* |
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70 | * Second, test if it is the portion of the kernel address space |
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1851 | jermar | 71 | * which is faulting. If that is the case, immediately create |
72 | * identity mapping for that page in DTLB. VPN 0 is excluded from |
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73 | * this treatment. |
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74 | * |
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75 | * Note that branch-delay slots are used in order to save space. |
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76 | */ |
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1852 | jermar | 77 | 0: |
1851 | jermar | 78 | mov VA_DMMU_TAG_ACCESS, %g1 |
79 | ldxa [%g1] ASI_DMMU, %g1 ! read the faulting Context and VPN |
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80 | set TLB_TAG_ACCESS_CONTEXT_MASK, %g2 |
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81 | andcc %g1, %g2, %g3 ! get Context |
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82 | bnz 0f ! Context is non-zero |
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83 | andncc %g1, %g2, %g3 ! get page address into %g3 |
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84 | bz 0f ! page address is zero |
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85 | |||
86 | or %g3, (TTE_CP|TTE_P|TTE_W), %g2 ! 8K pages are the default (encoded as 0) |
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87 | set 1, %g3 |
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88 | sllx %g3, TTE_V_SHIFT, %g3 |
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89 | or %g2, %g3, %g2 |
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90 | stxa %g2, [%g0] ASI_DTLB_DATA_IN_REG ! identity map the kernel page |
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864 | jermar | 91 | retry |
1851 | jermar | 92 | |
1852 | jermar | 93 | /* |
94 | * Third, catch and handle special cases when the trap is caused by |
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95 | * some register window trap handler. |
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96 | */ |
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1851 | jermar | 97 | 0: |
1852 | jermar | 98 | ! TODO |
99 | |||
100 | 0: |
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101 | wrpr %g0, PSTATE_PRIV_BIT | PSTATE_AG_BIT, %pstate |
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1851 | jermar | 102 | PREEMPTIBLE_HANDLER fast_data_access_mmu_miss |
864 | jermar | 103 | .endm |
104 | |||
105 | .macro FAST_DATA_ACCESS_PROTECTION_HANDLER |
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1859 | jermar | 106 | wrpr %g0, PSTATE_PRIV_BIT | PSTATE_AG_BIT, %pstate |
107 | PREEMPTIBLE_HANDLER fast_data_access_protection |
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864 | jermar | 108 | .endm |
867 | jermar | 109 | #endif /* __ASM__ */ |
864 | jermar | 110 | |
111 | #endif |
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1702 | cejka | 112 | |
1703 | jermar | 113 | /** @} |
1702 | cejka | 114 | */ |