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| Rev | Author | Line No. | Line |
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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 | |||
| 37 | #ifndef __sparc64_MMU_TRAP_H__ |
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| 38 | #define __sparc64_MMU_TRAP_H__ |
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| 39 | |||
| 883 | jermar | 40 | #include <arch/stack.h> |
| 1851 | jermar | 41 | #include <arch/mm/tlb.h> |
| 42 | #include <arch/mm/mmu.h> |
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| 43 | #include <arch/mm/tte.h> |
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| 883 | jermar | 44 | |
| 864 | jermar | 45 | #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64 |
| 46 | #define TT_FAST_DATA_ACCESS_MMU_MISS 0x68 |
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| 47 | #define TT_FAST_DATA_ACCESS_PROTECTION 0x6c |
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| 48 | |||
| 49 | #define FAST_MMU_HANDLER_SIZE 128 |
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| 50 | |||
| 867 | jermar | 51 | #ifdef __ASM__ |
| 864 | jermar | 52 | .macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER |
| 883 | jermar | 53 | save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
| 864 | jermar | 54 | call fast_instruction_access_mmu_miss |
| 55 | nop |
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| 883 | jermar | 56 | restore |
| 864 | jermar | 57 | retry |
| 58 | .endm |
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| 59 | |||
| 60 | .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER |
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| 1851 | jermar | 61 | /* |
| 62 | * First, test if it is the portion of the kernel address space |
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| 63 | * which is faulting. If that is the case, immediately create |
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| 64 | * identity mapping for that page in DTLB. VPN 0 is excluded from |
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| 65 | * this treatment. |
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| 66 | * |
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| 67 | * Note that branch-delay slots are used in order to save space. |
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| 68 | */ |
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| 69 | mov VA_DMMU_TAG_ACCESS, %g1 |
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| 70 | ldxa [%g1] ASI_DMMU, %g1 ! read the faulting Context and VPN |
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| 71 | set TLB_TAG_ACCESS_CONTEXT_MASK, %g2 |
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| 72 | andcc %g1, %g2, %g3 ! get Context |
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| 73 | bnz 0f ! Context is non-zero |
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| 74 | andncc %g1, %g2, %g3 ! get page address into %g3 |
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| 75 | bz 0f ! page address is zero |
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| 76 | |||
| 77 | /* |
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| 78 | * Create and insert the identity-mapped entry for |
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| 79 | * the faulting kernel page. |
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| 80 | */ |
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| 81 | |||
| 82 | or %g3, (TTE_CP|TTE_P|TTE_W), %g2 ! 8K pages are the default (encoded as 0) |
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| 83 | set 1, %g3 |
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| 84 | sllx %g3, TTE_V_SHIFT, %g3 |
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| 85 | or %g2, %g3, %g2 |
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| 86 | stxa %g2, [%g0] ASI_DTLB_DATA_IN_REG ! identity map the kernel page |
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| 864 | jermar | 87 | retry |
| 1851 | jermar | 88 | |
| 89 | 0: |
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| 90 | save %sp, -PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE, %sp |
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| 91 | PREEMPTIBLE_HANDLER fast_data_access_mmu_miss |
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| 864 | jermar | 92 | .endm |
| 93 | |||
| 94 | .macro FAST_DATA_ACCESS_PROTECTION_HANDLER |
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| 883 | jermar | 95 | save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
| 864 | jermar | 96 | call fast_data_access_protection |
| 97 | nop |
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| 883 | jermar | 98 | restore |
| 864 | jermar | 99 | retry |
| 100 | .endm |
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| 867 | jermar | 101 | #endif /* __ASM__ */ |
| 864 | jermar | 102 | |
| 103 | #endif |
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| 1702 | cejka | 104 | |
| 1703 | jermar | 105 | /** @} |
| 1702 | cejka | 106 | */ |