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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 | */ |