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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 KERN_sparc64_MMU_TRAP_H_ |
38 | #define __sparc64_MMU_TRAP_H__ |
38 | #define KERN_sparc64_MMU_TRAP_H_ |
39 | 39 | ||
40 | #include <arch/stack.h> |
40 | #include <arch/stack.h> |
41 | #include <arch/regdef.h> |
41 | #include <arch/regdef.h> |
42 | #include <arch/mm/tlb.h> |
42 | #include <arch/mm/tlb.h> |
43 | #include <arch/mm/mmu.h> |
43 | #include <arch/mm/mmu.h> |
44 | #include <arch/mm/tte.h> |
44 | #include <arch/mm/tte.h> |
45 | 45 | ||
46 | #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64 |
46 | #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64 |
47 | #define TT_FAST_DATA_ACCESS_MMU_MISS 0x68 |
47 | #define TT_FAST_DATA_ACCESS_MMU_MISS 0x68 |
48 | #define TT_FAST_DATA_ACCESS_PROTECTION 0x6c |
48 | #define TT_FAST_DATA_ACCESS_PROTECTION 0x6c |
49 | 49 | ||
50 | #define FAST_MMU_HANDLER_SIZE 128 |
50 | #define FAST_MMU_HANDLER_SIZE 128 |
51 | 51 | ||
52 | #ifdef __ASM__ |
52 | #ifdef __ASM__ |
53 | .macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER |
53 | .macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER |
54 | save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
- | |
- | 54 | /* |
|
55 | call fast_instruction_access_mmu_miss |
55 | * First, try to refill TLB from TSB. |
56 | nop |
56 | */ |
57 | restore |
57 | ! TODO |
58 | retry |
58 | |
- | 59 | wrpr %g0, PSTATE_PRIV_BIT | PSTATE_AG_BIT, %pstate |
|
- | 60 | PREEMPTIBLE_HANDLER fast_instruction_access_mmu_miss |
|
59 | .endm |
61 | .endm |
60 | 62 | ||
61 | .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER |
63 | .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER |
62 | /* |
64 | /* |
63 | * First, try to refill TLB from TSB. |
65 | * First, try to refill TLB from TSB. |
64 | */ |
66 | */ |
65 | ! TODO |
67 | ! TODO |
66 | 68 | ||
67 | /* |
69 | /* |
68 | * Second, test if it is the portion of the kernel address space |
70 | * Second, test if it is the portion of the kernel address space |
69 | * which is faulting. If that is the case, immediately create |
71 | * which is faulting. If that is the case, immediately create |
70 | * identity mapping for that page in DTLB. VPN 0 is excluded from |
72 | * identity mapping for that page in DTLB. VPN 0 is excluded from |
71 | * this treatment. |
73 | * this treatment. |
72 | * |
74 | * |
73 | * Note that branch-delay slots are used in order to save space. |
75 | * Note that branch-delay slots are used in order to save space. |
74 | */ |
76 | */ |
75 | 0: |
77 | 0: |
76 | mov VA_DMMU_TAG_ACCESS, %g1 |
78 | mov VA_DMMU_TAG_ACCESS, %g1 |
77 | ldxa [%g1] ASI_DMMU, %g1 ! read the faulting Context and VPN |
79 | ldxa [%g1] ASI_DMMU, %g1 ! read the faulting Context and VPN |
78 | set TLB_TAG_ACCESS_CONTEXT_MASK, %g2 |
80 | set TLB_TAG_ACCESS_CONTEXT_MASK, %g2 |
79 | andcc %g1, %g2, %g3 ! get Context |
81 | andcc %g1, %g2, %g3 ! get Context |
80 | bnz 0f ! Context is non-zero |
82 | bnz 0f ! Context is non-zero |
81 | andncc %g1, %g2, %g3 ! get page address into %g3 |
83 | andncc %g1, %g2, %g3 ! get page address into %g3 |
82 | bz 0f ! page address is zero |
84 | bz 0f ! page address is zero |
83 | 85 | ||
84 | or %g3, (TTE_CP|TTE_P|TTE_W), %g2 ! 8K pages are the default (encoded as 0) |
86 | or %g3, (TTE_CP|TTE_P|TTE_W), %g2 ! 8K pages are the default (encoded as 0) |
85 | set 1, %g3 |
87 | set 1, %g3 |
86 | sllx %g3, TTE_V_SHIFT, %g3 |
88 | sllx %g3, TTE_V_SHIFT, %g3 |
87 | or %g2, %g3, %g2 |
89 | or %g2, %g3, %g2 |
88 | stxa %g2, [%g0] ASI_DTLB_DATA_IN_REG ! identity map the kernel page |
90 | stxa %g2, [%g0] ASI_DTLB_DATA_IN_REG ! identity map the kernel page |
89 | retry |
91 | retry |
90 | 92 | ||
91 | /* |
93 | /* |
92 | * Third, catch and handle special cases when the trap is caused by |
94 | * Third, catch and handle special cases when the trap is caused by |
93 | * some register window trap handler. |
95 | * some register window trap handler. |
94 | */ |
96 | */ |
95 | 0: |
97 | 0: |
96 | ! TODO |
98 | ! TODO |
97 | 99 | ||
98 | 0: |
100 | 0: |
99 | wrpr %g0, PSTATE_PRIV_BIT | PSTATE_AG_BIT, %pstate |
101 | wrpr %g0, PSTATE_PRIV_BIT | PSTATE_AG_BIT, %pstate |
100 | PREEMPTIBLE_HANDLER fast_data_access_mmu_miss |
102 | PREEMPTIBLE_HANDLER fast_data_access_mmu_miss |
101 | .endm |
103 | .endm |
102 | 104 | ||
103 | .macro FAST_DATA_ACCESS_PROTECTION_HANDLER |
105 | .macro FAST_DATA_ACCESS_PROTECTION_HANDLER |
104 | save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp |
106 | wrpr %g0, PSTATE_PRIV_BIT | PSTATE_AG_BIT, %pstate |
105 | call fast_data_access_protection |
107 | PREEMPTIBLE_HANDLER fast_data_access_protection |
106 | nop |
- | |
107 | restore |
- | |
108 | retry |
- | |
109 | .endm |
108 | .endm |
110 | #endif /* __ASM__ */ |
109 | #endif /* __ASM__ */ |
111 | 110 | ||
112 | #endif |
111 | #endif |
113 | 112 | ||
114 | /** @} |
113 | /** @} |
115 | */ |
114 | */ |
116 | 115 |