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1 | /* |
1 | /* |
2 | * Copyright (c) 2006 Jakub Jermar |
2 | * Copyright (c) 2006 Jakub Jermar |
3 | * Copyright (c) 2008 Pavel Rimsky |
3 | * Copyright (c) 2008 Pavel Rimsky |
4 | * All rights reserved. |
4 | * All rights reserved. |
5 | * |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without |
6 | * Redistribution and use in source and binary forms, with or without |
7 | * modification, are permitted provided that the following conditions |
7 | * modification, are permitted provided that the following conditions |
8 | * are met: |
8 | * are met: |
9 | * |
9 | * |
10 | * - Redistributions of source code must retain the above copyright |
10 | * - Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * - Redistributions in binary form must reproduce the above copyright |
12 | * - Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
14 | * documentation and/or other materials provided with the distribution. |
15 | * - The name of the author may not be used to endorse or promote products |
15 | * - The name of the author may not be used to endorse or promote products |
16 | * derived from this software without specific prior written permission. |
16 | * derived from this software without specific prior written permission. |
17 | * |
17 | * |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
28 | */ |
28 | */ |
29 | 29 | ||
30 | /** @addtogroup sparc64interrupt |
30 | /** @addtogroup sparc64interrupt |
31 | * @{ |
31 | * @{ |
32 | */ |
32 | */ |
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | * @brief This file contains fast MMU trap handlers. |
35 | * @brief This file contains fast MMU trap handlers. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #ifndef KERN_sparc64_sun4v_MMU_TRAP_H_ |
38 | #ifndef KERN_sparc64_sun4v_MMU_TRAP_H_ |
39 | #define KERN_sparc64_sun4v_MMU_TRAP_H_ |
39 | #define KERN_sparc64_sun4v_MMU_TRAP_H_ |
40 | 40 | ||
41 | #include <arch/stack.h> |
41 | #include <arch/stack.h> |
42 | #include <arch/sun4v/regdef.h> |
42 | #include <arch/regdef.h> |
43 | #include <arch/sun4v/arch.h> |
43 | #include <arch/arch.h> |
44 | #include <arch/sun4v/hypercall.h> |
44 | #include <arch/sun4v/hypercall.h> |
45 | #include <arch/mm/sun4v/tlb.h> |
45 | #include <arch/mm/tlb.h> |
46 | #include <arch/mm/sun4v/mmu.h> |
46 | #include <arch/mm/mmu.h> |
47 | #include <arch/mm/sun4v/tte.h> |
47 | #include <arch/mm/tte.h> |
48 | #include <arch/trap/regwin.h> |
48 | #include <arch/trap/regwin.h> |
49 | 49 | ||
50 | #ifdef CONFIG_TSB |
50 | #ifdef CONFIG_TSB |
51 | #include <arch/mm/tsb.h> |
51 | #include <arch/mm/tsb.h> |
52 | #endif |
52 | #endif |
53 | 53 | ||
54 | #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64 |
54 | #define TT_FAST_INSTRUCTION_ACCESS_MMU_MISS 0x64 |
55 | #define TT_FAST_DATA_ACCESS_MMU_MISS 0x68 |
55 | #define TT_FAST_DATA_ACCESS_MMU_MISS 0x68 |
56 | #define TT_FAST_DATA_ACCESS_PROTECTION 0x6c |
56 | #define TT_FAST_DATA_ACCESS_PROTECTION 0x6c |
57 | 57 | ||
58 | #define FAST_MMU_HANDLER_SIZE 128 |
58 | #define FAST_MMU_HANDLER_SIZE 128 |
59 | 59 | ||
60 | #ifdef __ASM__ |
60 | #ifdef __ASM__ |
61 | 61 | ||
62 | /* MMU fault status area data fault offset */ |
62 | /* MMU fault status area data fault offset */ |
63 | #define FSA_DFA_OFFSET 0x48 |
63 | #define FSA_DFA_OFFSET 0x48 |
64 | 64 | ||
65 | /* MMU fault status area data context */ |
65 | /* MMU fault status area data context */ |
66 | #define FSA_DFC_OFFSET 0x50 |
66 | #define FSA_DFC_OFFSET 0x50 |
67 | 67 | ||
68 | /* offset of the target address within the TTE Data entry */ |
68 | /* offset of the target address within the TTE Data entry */ |
69 | #define TTE_DATA_TADDR_OFFSET 13 |
69 | #define TTE_DATA_TADDR_OFFSET 13 |
70 | 70 | ||
71 | .macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER |
71 | .macro FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER |
72 | .endm |
72 | .endm |
73 | 73 | ||
74 | /* |
74 | /* |
75 | * Handler of the Fast Data Access MMU Miss trap. If the trap occurred in the kernel |
75 | * Handler of the Fast Data Access MMU Miss trap. If the trap occurred in the kernel |
76 | * (context 0), an identity mapping (with displacement) is installed. Otherwise |
76 | * (context 0), an identity mapping (with displacement) is installed. Otherwise |
77 | * a higher level service routine is called. |
77 | * a higher level service routine is called. |
78 | * |
78 | * |
79 | * TODO implement calling the higher level service routine |
79 | * TODO implement calling the higher level service routine |
80 | */ |
80 | */ |
81 | .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER tl |
81 | .macro FAST_DATA_ACCESS_MMU_MISS_HANDLER tl |
82 | 82 | ||
83 | mov SCRATCHPAD_MMU_FSA, %g1 |
83 | mov SCRATCHPAD_MMU_FSA, %g1 |
84 | ldxa [%g1] ASI_SCRATCHPAD, %g1 ! g1 <= RA of MMU fault status area |
84 | ldxa [%g1] ASI_SCRATCHPAD, %g1 ! g1 <= RA of MMU fault status area |
85 | 85 | ||
86 | /* service by higher-level routine when context != 0 */ |
86 | /* service by higher-level routine when context != 0 */ |
87 | add %g1, FSA_DFC_OFFSET, %g2 ! g2 <= RA of data fault context |
87 | add %g1, FSA_DFC_OFFSET, %g2 ! g2 <= RA of data fault context |
88 | ldxa [%g2] ASI_REAL, %g3 ! read the fault context |
88 | ldxa [%g2] ASI_REAL, %g3 ! read the fault context |
89 | brnz %g3, 0f |
89 | brnz %g3, 0f |
90 | nop |
90 | nop |
91 | 91 | ||
92 | /* read the faulting address */ |
92 | /* read the faulting address */ |
93 | add %g1, FSA_DFA_OFFSET, %g2 ! g2 <= RA of data fault address |
93 | add %g1, FSA_DFA_OFFSET, %g2 ! g2 <= RA of data fault address |
94 | ldxa [%g2] ASI_REAL, %g1 ! read the fault address |
94 | ldxa [%g2] ASI_REAL, %g1 ! read the fault address |
95 | srlx %g1, TTE_DATA_TADDR_OFFSET, %g1 ! truncate it to page boundary |
95 | srlx %g1, TTE_DATA_TADDR_OFFSET, %g1 ! truncate it to page boundary |
96 | sllx %g1, TTE_DATA_TADDR_OFFSET, %g1 |
96 | sllx %g1, TTE_DATA_TADDR_OFFSET, %g1 |
97 | 97 | ||
98 | /* exclude page number 0 from installing the identity mapping */ |
98 | /* exclude page number 0 from installing the identity mapping */ |
99 | brz %g1, 0f |
99 | brz %g1, 0f |
100 | nop |
100 | nop |
101 | 101 | ||
102 | /* installing the identity does not fit into 32 instructions, call a separate routine */ |
102 | /* installing the identity does not fit into 32 instructions, call a separate routine */ |
103 | ba install_identity_mapping |
103 | ba install_identity_mapping |
104 | nop |
104 | nop |
105 | 105 | ||
106 | 0: ! TODO - call higher level service routine |
106 | 0: ! TODO - call higher level service routine |
107 | 107 | ||
108 | .endm |
108 | .endm |
109 | 109 | ||
110 | .macro FAST_DATA_ACCESS_PROTECTION_HANDLER tl |
110 | .macro FAST_DATA_ACCESS_PROTECTION_HANDLER tl |
111 | .endm |
111 | .endm |
112 | 112 | ||
113 | #endif /* __ASM__ */ |
113 | #endif /* __ASM__ */ |
114 | 114 | ||
115 | #endif |
115 | #endif |
116 | 116 | ||
117 | /** @} |
117 | /** @} |
118 | */ |
118 | */ |
119 | 119 |