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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
2 | * Copyright (C) 2006 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup sparc64interrupt |
29 | /** @addtogroup sparc64interrupt |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** |
32 | /** |
33 | * @file |
33 | * @file |
34 | * @brief This file contains fast MMU trap handlers. |
34 | * @brief This file contains fast MMU trap handlers. |
35 | */ |
35 | */ |
36 | 36 | ||
37 | #ifndef __sparc64_MMU_TRAP_H__ |
37 | #ifndef __sparc64_MMU_TRAP_H__ |
38 | #define __sparc64_MMU_TRAP_H__ |
38 | #define __sparc64_MMU_TRAP_H__ |
39 | 39 | ||
40 | #include <arch/stack.h> |
40 | #include <arch/stack.h> |
- | 41 | #include <arch/mm/tlb.h> |
|
- | 42 | #include <arch/mm/mmu.h> |
|
- | 43 | #include <arch/mm/tte.h> |
|
41 | 44 | ||
42 | #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64 |
45 | #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64 |
43 | #define TT_FAST_DATA_ACCESS_MMU_MISS 0x68 |
46 | #define TT_FAST_DATA_ACCESS_MMU_MISS 0x68 |
44 | #define TT_FAST_DATA_ACCESS_PROTECTION 0x6c |
47 | #define TT_FAST_DATA_ACCESS_PROTECTION 0x6c |
45 | 48 | ||
46 | #define FAST_MMU_HANDLER_SIZE 128 |
49 | #define FAST_MMU_HANDLER_SIZE 128 |
47 | 50 | ||
48 | #ifdef __ASM__ |
51 | #ifdef __ASM__ |
49 | .macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER |
52 | .macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER |
50 | save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
53 | save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
51 | call fast_instruction_access_mmu_miss |
54 | call fast_instruction_access_mmu_miss |
52 | nop |
55 | nop |
53 | restore |
56 | restore |
54 | retry |
57 | retry |
55 | .endm |
58 | .endm |
56 | 59 | ||
57 | .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER |
60 | .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER |
- | 61 | /* |
|
- | 62 | * First, test if it is the portion of the kernel address space |
|
- | 63 | * which is faulting. If that is the case, immediately create |
|
- | 64 | * identity mapping for that page in DTLB. VPN 0 is excluded from |
|
- | 65 | * this treatment. |
|
- | 66 | * |
|
- | 67 | * Note that branch-delay slots are used in order to save space. |
|
- | 68 | */ |
|
- | 69 | mov VA_DMMU_TAG_ACCESS, %g1 |
|
- | 70 | ldxa [%g1] ASI_DMMU, %g1 ! read the faulting Context and VPN |
|
58 | save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
71 | set TLB_TAG_ACCESS_CONTEXT_MASK, %g2 |
- | 72 | andcc %g1, %g2, %g3 ! get Context |
|
- | 73 | bnz 0f ! Context is non-zero |
|
- | 74 | andncc %g1, %g2, %g3 ! get page address into %g3 |
|
59 | call fast_data_access_mmu_miss |
75 | bz 0f ! page address is zero |
- | 76 | ||
60 | nop |
77 | /* |
- | 78 | * Create and insert the identity-mapped entry for |
|
- | 79 | * the faulting kernel page. |
|
61 | restore |
80 | */ |
- | 81 | ||
- | 82 | or %g3, (TTE_CP|TTE_P|TTE_W), %g2 ! 8K pages are the default (encoded as 0) |
|
- | 83 | set 1, %g3 |
|
- | 84 | sllx %g3, TTE_V_SHIFT, %g3 |
|
- | 85 | or %g2, %g3, %g2 |
|
- | 86 | stxa %g2, [%g0] ASI_DTLB_DATA_IN_REG ! identity map the kernel page |
|
62 | retry |
87 | retry |
- | 88 | ||
- | 89 | 0: |
|
- | 90 | save %sp, -PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE, %sp |
|
- | 91 | PREEMPTIBLE_HANDLER fast_data_access_mmu_miss |
|
63 | .endm |
92 | .endm |
64 | 93 | ||
65 | .macro FAST_DATA_ACCESS_PROTECTION_HANDLER |
94 | .macro FAST_DATA_ACCESS_PROTECTION_HANDLER |
66 | save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
95 | save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
67 | call fast_data_access_protection |
96 | call fast_data_access_protection |
68 | nop |
97 | nop |
69 | restore |
98 | restore |
70 | retry |
99 | retry |
71 | .endm |
100 | .endm |
72 | #endif /* __ASM__ */ |
101 | #endif /* __ASM__ */ |
73 | 102 | ||
74 | #endif |
103 | #endif |
75 | 104 | ||
76 | /** @} |
105 | /** @} |
77 | */ |
106 | */ |
78 | 107 |