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1 | /* |
2 | * ========== Copyright Header Begin ========================================== | |
3 | * | |
4 | * OpenSPARC T2 Processor File: daccess_except_handler.s | |
5 | * Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved | |
6 | * 4150 Network Circle, Santa Clara, California 95054, U.S.A. | |
7 | * | |
8 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; version 2 of the License. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | * For the avoidance of doubt, and except that if any non-GPL license | |
24 | * choice is available it will apply instead, Sun elects to use only | |
25 | * the General Public License version 2 (GPLv2) at this time for any | |
26 | * software where a choice of GPL license versions is made | |
27 | * available with the language indicating that GPLv2 or any later version | |
28 | * may be used, or where a choice of which version of the GPL is applied is | |
29 | * otherwise unspecified. | |
30 | * | |
31 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
32 | * CA 95054 USA or visit www.sun.com if you need additional information or | |
33 | * have any questions. | |
34 | * | |
35 | * | |
36 | * ========== Copyright Header End ============================================ | |
37 | */ | |
38 | daccess_except_handler: | |
39 | #ifdef CHECK_SFSR_SFAR | |
40 | mov 0x18, %g7 | |
41 | ldxa [%g7] 0x58, %g2 ! get sfsr | |
42 | mov 0x20, %g7 | |
43 | ldxa [%g7] 0x58, %g3 ! get sfar | |
44 | #endif | |
45 | ||
46 | dacc_ex_ps0: | |
47 | ldxa [%g0] 0x59, %g1 ! dmmu ps0 ptr | |
48 | ldda [%g1] 0x24, %g4 ! load tte from ps0 tsb | |
49 | cmp %g4, -1 ! if all 1's, follow link | |
50 | be,a %xcc, dacc_ex_ptr_chase | |
51 | mov 0, %g7 ! remember ptr chase from ps0 | |
52 | srlx %g5, 63, %g3 ! if not valid, check ps1 | |
53 | brz %g3, dacc_ex_ps1 | |
54 | ||
55 | #ifndef SUN4V | |
56 | sllx %g5, 15, %g3 ! extract size[2] | |
57 | srlx %g3, 61, %g3 | |
58 | sllx %g5, 1, %g1 ! extract size[1:0] | |
59 | srlx %g1, 62, %g1 | |
60 | or %g3, %g1, %g1 ! %g1 = size[2:0] | |
61 | #else | |
62 | sllx %g5, 61, %g1 | |
63 | srlx %g1, 61, %g1 ! %g1 = size[2:0] | |
64 | #endif | |
65 | mulx %g1, 3, %g1 | |
66 | sub %g0, 1, %g3 | |
67 | sllx %g3, 13, %g3 | |
68 | sllx %g3, %g1, %g3 | |
69 | sethi %hi(0x00001fff), %g1 | |
70 | or %g1, 0xfff, %g1 | |
71 | or %g3, %g1, %g3 ! %g3 = va/ctxt mask based on size[2:0] | |
72 | ||
73 | and %g2, %g3, %g3 ! apply mask | |
74 | cmp %g3, %g4 ! check if va/ctxt match | |
75 | be %xcc, dacc_ex_trap_done | |
76 | nop | |
77 | ||
78 | dacc_ex_ps1: | |
79 | ldxa [%g0] 0x5a, %g1 ! dmmu ps1 ptr | |
80 | ldda [%g1] 0x24, %g4 ! load tte from ps1 tsb | |
81 | cmp %g4, -1 ! if all 1's, follow link | |
82 | be,a %xcc, dacc_ex_ptr_chase | |
83 | mov 1, %g7 ! remember ptr chase from ps1 | |
84 | srlx %g5, 63, %g3 ! if not valid, bad_trap | |
85 | !brz %g3, bad_trap | |
86 | cmp %g3, 0x0 | |
87 | tz T_BAD_TRAP | |
88 | ||
89 | ||
90 | #ifndef SUN4V | |
91 | sllx %g5, 15, %g3 ! extract size[2] | |
92 | srlx %g3, 61, %g3 | |
93 | sllx %g5, 1, %g1 ! extract size[1:0] | |
94 | srlx %g1, 62, %g1 | |
95 | or %g3, %g1, %g1 ! %g1 = size[2:0] | |
96 | #else | |
97 | sllx %g5, 61, %g1 | |
98 | srlx %g1, 61, %g1 ! %g1 = size[2:0] | |
99 | #endif | |
100 | mulx %g1, 3, %g1 | |
101 | sub %g0, 1, %g3 | |
102 | sllx %g3, 13, %g3 | |
103 | sllx %g3, %g1, %g3 | |
104 | sethi %hi(0x00001fff), %g1 | |
105 | or %g1, 0xfff, %g1 | |
106 | or %g3, %g1, %g3 ! %g3 = va/ctxt mask based on size[2:0] | |
107 | ||
108 | and %g2, %g3, %g3 ! apply mask | |
109 | cmp %g3, %g4 ! check if va/ctxt match | |
110 | be %xcc, dacc_ex_trap_done | |
111 | nop | |
112 | ||
113 | ta T_BAD_TRAP | |
114 | nop | |
115 | ||
116 | dacc_ex_ptr_chase: | |
117 | or %g5, %g0, %g6 ! %g6 is link-reg | |
118 | dacc_ex_ptr_chase_loop: | |
119 | ldda [%g6] 0x24, %g4 ! load tte from tsb | |
120 | ||
121 | #ifndef SUN4V | |
122 | sllx %g5, 15, %g3 ! extract size[2] | |
123 | srlx %g3, 61, %g3 | |
124 | sllx %g5, 1, %g1 ! extract size[1:0] | |
125 | srlx %g1, 62, %g1 | |
126 | or %g3, %g1, %g1 ! %g1 = size[2:0] | |
127 | #else | |
128 | sllx %g5, 61, %g1 | |
129 | srlx %g1, 61, %g1 ! %g1 = size[2:0] | |
130 | #endif | |
131 | mulx %g1, 3, %g1 | |
132 | sub %g0, 1, %g3 | |
133 | sllx %g3, 13, %g3 | |
134 | sllx %g3, %g1, %g3 | |
135 | sethi %hi(0x00001fff), %g1 | |
136 | or %g1, 0xfff, %g1 | |
137 | or %g3, %g1, %g3 ! %g3 = va/ctxt mask based on size[2:0] | |
138 | ||
139 | and %g2, %g3, %g3 ! apply mask | |
140 | cmp %g3, %g4 ! check if va/ctxt match | |
141 | be %xcc, dacc_ex_trap_done | |
142 | ||
143 | ldx [%g6+16], %g6 | |
144 | cmp %g6, -1 | |
145 | bne %xcc, dacc_ex_ptr_chase_loop ! keep chasing pointer | |
146 | nop | |
147 | brz %g7, dacc_ex_ps1 ! finished ps0 pointer chasing, go to ps1 | |
148 | nop | |
149 | ta T_BAD_TRAP ! finished ps1 pointer chasing, go to bad_trap | |
150 | nop | |
151 | ||
152 | dacc_ex_trap_done: | |
153 | ! add partition base to data-in | |
154 | setx partition_base_list, %g1, %g2 ! for partition base | |
155 | mov 0x80, %g1 ! offset (VA) for patrition id | |
156 | ldxa [%g1] 0x58, %g3 ! partition id | |
157 | sllx %g3, 3, %g3 ! offset - partition list | |
158 | ldx [%g2 + %g3], %g1 | |
159 | add %g5, %g1, %g5 | |
160 | mov 0x4, %g1 ! clear P-bit | |
161 | not %g1 | |
162 | and %g1, %g5, %g5 | |
163 | mov 0x30, %g7 | |
164 | mov %g0, %g6 | |
165 | stxa %g4, [ %g7 ] 0x58 ! {tag-access, data-in} | |
166 | stxa %g5, [ %g6 ] 0x5c | |
167 | retry | |
168 |