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1 | #ifndef _SPARC64_TSB_H |
2 | #define _SPARC64_TSB_H | |
3 | ||
4 | /* The sparc64 TSB is similar to the powerpc hashtables. It's a | |
5 | * power-of-2 sized table of TAG/PTE pairs. The cpu precomputes | |
6 | * pointers into this table for 8K and 64K page sizes, and also a | |
7 | * comparison TAG based upon the virtual address and context which | |
8 | * faults. | |
9 | * | |
10 | * TLB miss trap handler software does the actual lookup via something | |
11 | * of the form: | |
12 | * | |
13 | * ldxa [%g0] ASI_{D,I}MMU_TSB_8KB_PTR, %g1 | |
14 | * ldxa [%g0] ASI_{D,I}MMU, %g6 | |
15 | * sllx %g6, 22, %g6 | |
16 | * srlx %g6, 22, %g6 | |
17 | * ldda [%g1] ASI_NUCLEUS_QUAD_LDD, %g4 | |
18 | * cmp %g4, %g6 | |
19 | * bne,pn %xcc, tsb_miss_{d,i}tlb | |
20 | * mov FAULT_CODE_{D,I}TLB, %g3 | |
21 | * stxa %g5, [%g0] ASI_{D,I}TLB_DATA_IN | |
22 | * retry | |
23 | * | |
24 | * | |
25 | * Each 16-byte slot of the TSB is the 8-byte tag and then the 8-byte | |
26 | * PTE. The TAG is of the same layout as the TLB TAG TARGET mmu | |
27 | * register which is: | |
28 | * | |
29 | * ------------------------------------------------- | |
30 | * | - | CONTEXT | - | VADDR bits 63:22 | | |
31 | * ------------------------------------------------- | |
32 | * 63 61 60 48 47 42 41 0 | |
33 | * | |
34 | * But actually, since we use per-mm TSB's, we zero out the CONTEXT | |
35 | * field. | |
36 | * | |
37 | * Like the powerpc hashtables we need to use locking in order to | |
38 | * synchronize while we update the entries. PTE updates need locking | |
39 | * as well. | |
40 | * | |
41 | * We need to carefully choose a lock bits for the TSB entry. We | |
42 | * choose to use bit 47 in the tag. Also, since we never map anything | |
43 | * at page zero in context zero, we use zero as an invalid tag entry. | |
44 | * When the lock bit is set, this forces a tag comparison failure. | |
45 | */ | |
46 | ||
47 | #define TSB_TAG_LOCK_BIT 47 | |
48 | #define TSB_TAG_LOCK_HIGH (1 << (TSB_TAG_LOCK_BIT - 32)) | |
49 | ||
50 | #define TSB_TAG_INVALID_BIT 46 | |
51 | #define TSB_TAG_INVALID_HIGH (1 << (TSB_TAG_INVALID_BIT - 32)) | |
52 | ||
a00736e9 SR |
53 | /* Some cpus support physical address quad loads. We want to use |
54 | * those if possible so we don't need to hard-lock the TSB mapping | |
55 | * into the TLB. We encode some instruction patching in order to | |
56 | * support this. | |
57 | * | |
58 | * The kernel TSB is locked into the TLB by virtue of being in the | |
59 | * kernel image, so we don't play these games for swapper_tsb access. | |
60 | */ | |
61 | #ifndef __ASSEMBLY__ | |
62 | struct tsb_ldquad_phys_patch_entry { | |
63 | unsigned int addr; | |
64 | unsigned int sun4u_insn; | |
65 | unsigned int sun4v_insn; | |
66 | }; | |
67 | extern struct tsb_ldquad_phys_patch_entry __tsb_ldquad_phys_patch, | |
68 | __tsb_ldquad_phys_patch_end; | |
69 | ||
70 | struct tsb_phys_patch_entry { | |
71 | unsigned int addr; | |
72 | unsigned int insn; | |
73 | }; | |
74 | extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end; | |
75 | #endif | |
76 | #define TSB_LOAD_QUAD(TSB, REG) \ | |
77 | 661: ldda [TSB] ASI_NUCLEUS_QUAD_LDD, REG; \ | |
78 | .section .tsb_ldquad_phys_patch, "ax"; \ | |
79 | .word 661b; \ | |
80 | ldda [TSB] ASI_QUAD_LDD_PHYS, REG; \ | |
81 | ldda [TSB] ASI_QUAD_LDD_PHYS_4V, REG; \ | |
82 | .previous | |
83 | ||
84 | #define TSB_LOAD_TAG_HIGH(TSB, REG) \ | |
85 | 661: lduwa [TSB] ASI_N, REG; \ | |
86 | .section .tsb_phys_patch, "ax"; \ | |
87 | .word 661b; \ | |
88 | lduwa [TSB] ASI_PHYS_USE_EC, REG; \ | |
89 | .previous | |
90 | ||
91 | #define TSB_LOAD_TAG(TSB, REG) \ | |
92 | 661: ldxa [TSB] ASI_N, REG; \ | |
93 | .section .tsb_phys_patch, "ax"; \ | |
94 | .word 661b; \ | |
95 | ldxa [TSB] ASI_PHYS_USE_EC, REG; \ | |
96 | .previous | |
97 | ||
98 | #define TSB_CAS_TAG_HIGH(TSB, REG1, REG2) \ | |
99 | 661: casa [TSB] ASI_N, REG1, REG2; \ | |
100 | .section .tsb_phys_patch, "ax"; \ | |
101 | .word 661b; \ | |
102 | casa [TSB] ASI_PHYS_USE_EC, REG1, REG2; \ | |
103 | .previous | |
104 | ||
105 | #define TSB_CAS_TAG(TSB, REG1, REG2) \ | |
106 | 661: casxa [TSB] ASI_N, REG1, REG2; \ | |
107 | .section .tsb_phys_patch, "ax"; \ | |
108 | .word 661b; \ | |
109 | casxa [TSB] ASI_PHYS_USE_EC, REG1, REG2; \ | |
110 | .previous | |
111 | ||
112 | #define TSB_STORE(ADDR, VAL) \ | |
113 | 661: stxa VAL, [ADDR] ASI_N; \ | |
114 | .section .tsb_phys_patch, "ax"; \ | |
115 | .word 661b; \ | |
116 | stxa VAL, [ADDR] ASI_PHYS_USE_EC; \ | |
117 | .previous | |
118 | ||
119 | #define TSB_LOCK_TAG(TSB, REG1, REG2) \ | |
120 | 99: TSB_LOAD_TAG_HIGH(TSB, REG1); \ | |
121 | sethi %hi(TSB_TAG_LOCK_HIGH), REG2;\ | |
122 | andcc REG1, REG2, %g0; \ | |
123 | bne,pn %icc, 99b; \ | |
124 | nop; \ | |
125 | TSB_CAS_TAG_HIGH(TSB, REG1, REG2); \ | |
126 | cmp REG1, REG2; \ | |
127 | bne,pn %icc, 99b; \ | |
128 | nop; \ | |
a00736e9 SR |
129 | |
130 | #define TSB_WRITE(TSB, TTE, TAG) \ | |
131 | add TSB, 0x8, TSB; \ | |
132 | TSB_STORE(TSB, TTE); \ | |
133 | sub TSB, 0x8, TSB; \ | |
a00736e9 SR |
134 | TSB_STORE(TSB, TAG); |
135 | ||
136 | #define KTSB_LOAD_QUAD(TSB, REG) \ | |
137 | ldda [TSB] ASI_NUCLEUS_QUAD_LDD, REG; | |
138 | ||
139 | #define KTSB_STORE(ADDR, VAL) \ | |
140 | stxa VAL, [ADDR] ASI_N; | |
141 | ||
142 | #define KTSB_LOCK_TAG(TSB, REG1, REG2) \ | |
143 | 99: lduwa [TSB] ASI_N, REG1; \ | |
144 | sethi %hi(TSB_TAG_LOCK_HIGH), REG2;\ | |
145 | andcc REG1, REG2, %g0; \ | |
146 | bne,pn %icc, 99b; \ | |
147 | nop; \ | |
148 | casa [TSB] ASI_N, REG1, REG2;\ | |
149 | cmp REG1, REG2; \ | |
150 | bne,pn %icc, 99b; \ | |
151 | nop; \ | |
a00736e9 SR |
152 | |
153 | #define KTSB_WRITE(TSB, TTE, TAG) \ | |
154 | add TSB, 0x8, TSB; \ | |
155 | stxa TTE, [TSB] ASI_N; \ | |
156 | sub TSB, 0x8, TSB; \ | |
a00736e9 SR |
157 | stxa TAG, [TSB] ASI_N; |
158 | ||
159 | /* Do a kernel page table walk. Leaves physical PTE pointer in | |
160 | * REG1. Jumps to FAIL_LABEL on early page table walk termination. | |
161 | * VADDR will not be clobbered, but REG2 will. | |
162 | */ | |
163 | #define KERN_PGTABLE_WALK(VADDR, REG1, REG2, FAIL_LABEL) \ | |
164 | sethi %hi(swapper_pg_dir), REG1; \ | |
165 | or REG1, %lo(swapper_pg_dir), REG1; \ | |
166 | sllx VADDR, 64 - (PGDIR_SHIFT + PGDIR_BITS), REG2; \ | |
167 | srlx REG2, 64 - PAGE_SHIFT, REG2; \ | |
168 | andn REG2, 0x3, REG2; \ | |
169 | lduw [REG1 + REG2], REG1; \ | |
170 | brz,pn REG1, FAIL_LABEL; \ | |
171 | sllx VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \ | |
172 | srlx REG2, 64 - PAGE_SHIFT, REG2; \ | |
173 | sllx REG1, 11, REG1; \ | |
174 | andn REG2, 0x3, REG2; \ | |
175 | lduwa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \ | |
176 | brz,pn REG1, FAIL_LABEL; \ | |
177 | sllx VADDR, 64 - PMD_SHIFT, REG2; \ | |
178 | srlx REG2, 64 - PAGE_SHIFT, REG2; \ | |
179 | sllx REG1, 11, REG1; \ | |
180 | andn REG2, 0x7, REG2; \ | |
181 | add REG1, REG2, REG1; | |
182 | ||
183 | /* Do a user page table walk in MMU globals. Leaves physical PTE | |
184 | * pointer in REG1. Jumps to FAIL_LABEL on early page table walk | |
185 | * termination. Physical base of page tables is in PHYS_PGD which | |
186 | * will not be modified. | |
187 | * | |
188 | * VADDR will not be clobbered, but REG1 and REG2 will. | |
189 | */ | |
190 | #define USER_PGTABLE_WALK_TL1(VADDR, PHYS_PGD, REG1, REG2, FAIL_LABEL) \ | |
191 | sllx VADDR, 64 - (PGDIR_SHIFT + PGDIR_BITS), REG2; \ | |
192 | srlx REG2, 64 - PAGE_SHIFT, REG2; \ | |
193 | andn REG2, 0x3, REG2; \ | |
194 | lduwa [PHYS_PGD + REG2] ASI_PHYS_USE_EC, REG1; \ | |
195 | brz,pn REG1, FAIL_LABEL; \ | |
196 | sllx VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \ | |
197 | srlx REG2, 64 - PAGE_SHIFT, REG2; \ | |
198 | sllx REG1, 11, REG1; \ | |
199 | andn REG2, 0x3, REG2; \ | |
200 | lduwa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \ | |
201 | brz,pn REG1, FAIL_LABEL; \ | |
202 | sllx VADDR, 64 - PMD_SHIFT, REG2; \ | |
203 | srlx REG2, 64 - PAGE_SHIFT, REG2; \ | |
204 | sllx REG1, 11, REG1; \ | |
205 | andn REG2, 0x7, REG2; \ | |
206 | add REG1, REG2, REG1; | |
207 | ||
208 | /* Lookup a OBP mapping on VADDR in the prom_trans[] table at TL>0. | |
209 | * If no entry is found, FAIL_LABEL will be branched to. On success | |
210 | * the resulting PTE value will be left in REG1. VADDR is preserved | |
211 | * by this routine. | |
212 | */ | |
213 | #define OBP_TRANS_LOOKUP(VADDR, REG1, REG2, REG3, FAIL_LABEL) \ | |
214 | sethi %hi(prom_trans), REG1; \ | |
215 | or REG1, %lo(prom_trans), REG1; \ | |
216 | 97: ldx [REG1 + 0x00], REG2; \ | |
217 | brz,pn REG2, FAIL_LABEL; \ | |
218 | nop; \ | |
219 | ldx [REG1 + 0x08], REG3; \ | |
220 | add REG2, REG3, REG3; \ | |
221 | cmp REG2, VADDR; \ | |
222 | bgu,pt %xcc, 98f; \ | |
223 | cmp VADDR, REG3; \ | |
224 | bgeu,pt %xcc, 98f; \ | |
225 | ldx [REG1 + 0x10], REG3; \ | |
226 | sub VADDR, REG2, REG2; \ | |
227 | ba,pt %xcc, 99f; \ | |
228 | add REG3, REG2, REG1; \ | |
229 | 98: ba,pt %xcc, 97b; \ | |
230 | add REG1, (3 * 8), REG1; \ | |
231 | 99: | |
232 | ||
233 | /* We use a 32K TSB for the whole kernel, this allows to | |
234 | * handle about 16MB of modules and vmalloc mappings without | |
235 | * incurring many hash conflicts. | |
236 | */ | |
237 | #define KERNEL_TSB_SIZE_BYTES (32 * 1024) | |
238 | #define KERNEL_TSB_NENTRIES \ | |
239 | (KERNEL_TSB_SIZE_BYTES / 16) | |
240 | #define KERNEL_TSB4M_NENTRIES 4096 | |
241 | ||
242 | /* Do a kernel TSB lookup at tl>0 on VADDR+TAG, branch to OK_LABEL | |
243 | * on TSB hit. REG1, REG2, REG3, and REG4 are used as temporaries | |
244 | * and the found TTE will be left in REG1. REG3 and REG4 must | |
245 | * be an even/odd pair of registers. | |
246 | * | |
247 | * VADDR and TAG will be preserved and not clobbered by this macro. | |
248 | */ | |
249 | #define KERN_TSB_LOOKUP_TL1(VADDR, TAG, REG1, REG2, REG3, REG4, OK_LABEL) \ | |
250 | sethi %hi(swapper_tsb), REG1; \ | |
251 | or REG1, %lo(swapper_tsb), REG1; \ | |
252 | srlx VADDR, PAGE_SHIFT, REG2; \ | |
253 | and REG2, (KERNEL_TSB_NENTRIES - 1), REG2; \ | |
254 | sllx REG2, 4, REG2; \ | |
255 | add REG1, REG2, REG2; \ | |
256 | KTSB_LOAD_QUAD(REG2, REG3); \ | |
257 | cmp REG3, TAG; \ | |
258 | be,a,pt %xcc, OK_LABEL; \ | |
259 | mov REG4, REG1; | |
260 | ||
261 | #ifndef CONFIG_DEBUG_PAGEALLOC | |
262 | /* This version uses a trick, the TAG is already (VADDR >> 22) so | |
263 | * we can make use of that for the index computation. | |
264 | */ | |
265 | #define KERN_TSB4M_LOOKUP_TL1(TAG, REG1, REG2, REG3, REG4, OK_LABEL) \ | |
266 | sethi %hi(swapper_4m_tsb), REG1; \ | |
267 | or REG1, %lo(swapper_4m_tsb), REG1; \ | |
268 | and TAG, (KERNEL_TSB4M_NENTRIES - 1), REG2; \ | |
269 | sllx REG2, 4, REG2; \ | |
270 | add REG1, REG2, REG2; \ | |
271 | KTSB_LOAD_QUAD(REG2, REG3); \ | |
272 | cmp REG3, TAG; \ | |
273 | be,a,pt %xcc, OK_LABEL; \ | |
274 | mov REG4, REG1; | |
275 | #endif | |
276 | ||
277 | #endif /* !(_SPARC64_TSB_H) */ |