1 /* sun4v_tlb_miss.S: Sun4v TLB miss handlers.
3 * Copyright (C) 2006 <davem@davemloft.net>
10 /* Load CPU ID into %g3. */
11 mov SCRATCHPAD_CPUID, %g1
12 ldxa [%g1] ASI_SCRATCHPAD, %g3
14 /* Load UTSB reg into %g1. */
15 ldxa [%g1 + %g1] ASI_SCRATCHPAD, %g1
17 /* Load &trap_block[smp_processor_id()] into %g2. */
18 sethi %hi(trap_block), %g2
19 or %g2, %lo(trap_block), %g2
20 sllx %g3, TRAP_BLOCK_SZ_SHIFT, %g3
23 /* Create a TAG TARGET, "(vaddr>>22) | (ctx << 48)", in %g6.
24 * Branch if kernel TLB miss. The kernel TSB and user TSB miss
25 * code wants the missing virtual address in %g4, so that value
26 * cannot be modified through the entirety of this handler.
28 ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_I_ADDR_OFFSET], %g4
29 ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_I_CTX_OFFSET], %g5
33 brz,pn %g5, kvmap_itlb_4v
36 /* Create TSB pointer. This is something like:
38 * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
39 * tsb_base = tsb_reg & ~0x7UL;
47 /* TSB index mask is in %g7, tsb base is in %g1. Compute
48 * the TSB entry pointer into %g1:
50 * tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
51 * tsb_ptr = tsb_base + (tsb_index * 16);
53 srlx %g4, PAGE_SHIFT, %g3
58 /* Load TSB tag/pte into %g2/%g3 and compare the tag. */
59 ldda [%g1] ASI_QUAD_LDD_PHYS, %g2
61 sethi %hi(_PAGE_EXEC), %g7
62 bne,a,pn %xcc, tsb_miss_page_table_walk
63 mov FAULT_CODE_ITLB, %g3
65 be,a,pn %xcc, tsb_do_fault
66 mov FAULT_CODE_ITLB, %g3
68 /* We have a valid entry, make hypervisor call to load
69 * I-TLB and return from trap.
73 * %g6: TAG TARGET (only "CTX << 48" part matters)
76 mov %o0, %g1 ! save %o0
77 mov %o1, %g2 ! save %o1
78 mov %o2, %g5 ! save %o2
79 mov %o3, %g7 ! save %o3
81 srlx %g6, 48, %o1 ! ctx
83 mov HV_MMU_IMMU, %o3 ! flags
84 ta HV_MMU_MAP_ADDR_TRAP
85 mov %g1, %o0 ! restore %o0
86 mov %g2, %o1 ! restore %o1
87 mov %g5, %o2 ! restore %o2
88 mov %g7, %o3 ! restore %o3
93 /* Load CPU ID into %g3. */
94 mov SCRATCHPAD_CPUID, %g1
95 ldxa [%g1] ASI_SCRATCHPAD, %g3
97 /* Load UTSB reg into %g1. */
98 ldxa [%g1 + %g1] ASI_SCRATCHPAD, %g1
100 /* Load &trap_block[smp_processor_id()] into %g2. */
101 sethi %hi(trap_block), %g2
102 or %g2, %lo(trap_block), %g2
103 sllx %g3, TRAP_BLOCK_SZ_SHIFT, %g3
106 /* Create a TAG TARGET, "(vaddr>>22) | (ctx << 48)", in %g6.
107 * Branch if kernel TLB miss. The kernel TSB and user TSB miss
108 * code wants the missing virtual address in %g4, so that value
109 * cannot be modified through the entirety of this handler.
111 ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_ADDR_OFFSET], %g4
112 ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_CTX_OFFSET], %g5
116 brz,pn %g5, kvmap_dtlb_4v
119 /* Create TSB pointer. This is something like:
121 * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
122 * tsb_base = tsb_reg & ~0x7UL;
130 /* TSB index mask is in %g7, tsb base is in %g1. Compute
131 * the TSB entry pointer into %g1:
133 * tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
134 * tsb_ptr = tsb_base + (tsb_index * 16);
136 srlx %g4, PAGE_SHIFT, %g3
141 /* Load TSB tag/pte into %g2/%g3 and compare the tag. */
142 ldda [%g1] ASI_QUAD_LDD_PHYS, %g2
144 bne,a,pn %xcc, tsb_miss_page_table_walk
145 mov FAULT_CODE_ITLB, %g3
147 /* We have a valid entry, make hypervisor call to load
148 * D-TLB and return from trap.
152 * %g6: TAG TARGET (only "CTX << 48" part matters)
155 mov %o0, %g1 ! save %o0
156 mov %o1, %g2 ! save %o1
157 mov %o2, %g5 ! save %o2
158 mov %o3, %g7 ! save %o3
160 srlx %g6, 48, %o1 ! ctx
162 mov HV_MMU_DMMU, %o3 ! flags
163 ta HV_MMU_MAP_ADDR_TRAP
164 mov %g1, %o0 ! restore %o0
165 mov %g2, %o1 ! restore %o1
166 mov %g5, %o2 ! restore %o2
167 mov %g7, %o3 ! restore %o3
172 /* Load CPU ID into %g3. */
173 mov SCRATCHPAD_CPUID, %g1
174 ldxa [%g1] ASI_SCRATCHPAD, %g3
176 /* Load &trap_block[smp_processor_id()] into %g2. */
177 sethi %hi(trap_block), %g2
178 or %g2, %lo(trap_block), %g2
179 sllx %g3, TRAP_BLOCK_SZ_SHIFT, %g3
182 ldx [%g2 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_ADDR_OFFSET], %g5
185 bgu,pn %xcc, winfix_trampoline
187 ba,pt %xcc, sparc64_realfault_common
188 mov FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4
190 /* Called from trap table with &trap_block[smp_processor_id()] in
191 * %g5 and SCRATCHPAD_UTSBREG1 contents in %g1.
194 ldx [%g5 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_I_ADDR_OFFSET], %g4
195 ldx [%g5 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_I_CTX_OFFSET], %g5
200 brz,pn %g5, kvmap_itlb_4v
203 ba,pt %xcc, sun4v_tsb_miss_common
204 mov FAULT_CODE_ITLB, %g3
206 /* Called from trap table with &trap_block[smp_processor_id()] in
207 * %g5 and SCRATCHPAD_UTSBREG1 contents in %g1.
210 ldx [%g5 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_ADDR_OFFSET], %g4
211 ldx [%g5 + TRAP_PER_CPU_FAULT_INFO + HV_FAULT_D_CTX_OFFSET], %g5
216 brz,pn %g5, kvmap_dtlb_4v
219 mov FAULT_CODE_DTLB, %g3
221 /* Create TSB pointer into %g1. This is something like:
223 * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
224 * tsb_base = tsb_reg & ~0x7UL;
225 * tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
226 * tsb_ptr = tsb_base + (tsb_index * 16);
228 sun4v_tsb_miss_common:
234 srlx %g4, PAGE_SHIFT, %g2
237 ba,pt %xcc, tsb_miss_page_table_walk
241 #define BRANCH_ALWAYS 0x10680000
242 #define NOP 0x01000000
243 #define SUN4V_DO_PATCH(OLD, NEW) \
244 sethi %hi(NEW), %g1; \
245 or %g1, %lo(NEW), %g1; \
246 sethi %hi(OLD), %g2; \
247 or %g2, %lo(OLD), %g2; \
249 sethi %hi(BRANCH_ALWAYS), %g3; \
251 or %g3, %lo(BRANCH_ALWAYS), %g3; \
254 sethi %hi(NOP), %g3; \
255 or %g3, %lo(NOP), %g3; \
256 stw %g3, [%g2 + 0x4]; \
259 .globl sun4v_patch_tlb_handlers
260 .type sun4v_patch_tlb_handlers,#function
261 sun4v_patch_tlb_handlers:
262 SUN4V_DO_PATCH(tl0_iamiss, sun4v_itlb_miss)
263 SUN4V_DO_PATCH(tl1_iamiss, sun4v_itlb_miss)
264 SUN4V_DO_PATCH(tl0_damiss, sun4v_dtlb_miss)
265 SUN4V_DO_PATCH(tl1_damiss, sun4v_dtlb_miss)
266 SUN4V_DO_PATCH(tl0_daprot, sun4v_dtlb_prot)
267 SUN4V_DO_PATCH(tl1_daprot, sun4v_dtlb_prot)
270 .size sun4v_patch_tlb_handlers,.-sun4v_patch_tlb_handlers