1 /* We need to carefully read the error status, ACK the errors,
2 * prevent recursive traps, and pass the information on to C
5 * We pass the AFAR in as-is, and we encode the status
6 * information as described in asm-sparc64/sfafsr.h
8 .type __spitfire_access_error,#function
9 __spitfire_access_error:
10 /* Disable ESTATE error reporting so that we do not take
11 * recursive traps and RED state the processor.
13 stxa %g0, [%g0] ASI_ESTATE_ERROR_EN
17 ldxa [%g0] ASI_AFSR, %g4 ! Get AFSR
19 /* __spitfire_cee_trap branches here with AFSR in %g4 and
20 * UDBE_CE in %g1. It only clears ESTATE_ERR_CE in the ESTATE
21 * Error Enable register.
23 __spitfire_cee_trap_continue:
24 ldxa [%g0] ASI_AFAR, %g5 ! Get AFAR
27 and %g3, 0x1ff, %g3 ! Paranoia
28 sllx %g3, SFSTAT_TRAP_TYPE_SHIFT, %g3
34 sllx %g3, SFSTAT_TL_GT_ONE_SHIFT, %g3
38 /* Read in the UDB error register state, clearing the sticky
39 * error bits as-needed. We only clear them if the UE bit is
40 * set. Likewise, __spitfire_cee_trap below will only do so
41 * if the CE bit is set.
43 * NOTE: UltraSparc-I/II have high and low UDB error
44 * registers, corresponding to the two UDB units
45 * present on those chips. UltraSparc-IIi only
46 * has a single UDB, called "SDB" in the manual.
47 * For IIi the upper UDB register always reads
48 * as zero so for our purposes things will just
49 * work with the checks below.
51 1: ldxa [%g0] ASI_UDBH_ERROR_R, %g3
52 and %g3, 0x3ff, %g7 ! Paranoia
53 sllx %g7, SFSTAT_UDBH_SHIFT, %g7
55 andcc %g3, %g1, %g3 ! UDBE_UE or UDBE_CE
58 stxa %g3, [%g0] ASI_UDB_ERROR_W
62 ldxa [%g3] ASI_UDBL_ERROR_R, %g3
63 and %g3, 0x3ff, %g7 ! Paranoia
64 sllx %g7, SFSTAT_UDBL_SHIFT, %g7
66 andcc %g3, %g1, %g3 ! UDBE_UE or UDBE_CE
70 stxa %g3, [%g7] ASI_UDB_ERROR_W
73 1: /* Ok, now that we've latched the error state, clear the
74 * sticky bits in the AFSR.
76 stxa %g4, [%g0] ASI_AFSR
91 1: ba,pt %xcc, etrap_irq
95 #ifdef CONFIG_TRACE_IRQFLAGS
96 call trace_hardirqs_off
101 call spitfire_access_error
102 add %sp, PTREGS_OFF, %o0
105 .size __spitfire_access_error,.-__spitfire_access_error
107 /* This is the trap handler entry point for ECC correctable
108 * errors. They are corrected, but we listen for the trap so
109 * that the event can be logged.
111 * Disrupting errors are either:
112 * 1) single-bit ECC errors during UDB reads to system
114 * 2) data parity errors during write-back events
116 * As far as I can make out from the manual, the CEE trap is
117 * only for correctable errors during memory read accesses by
118 * the front-end of the processor.
120 * The code below is only for trap level 1 CEE events, as it
121 * is the only situation where we can safely record and log.
122 * For trap level >1 we just clear the CE bit in the AFSR and
125 * This is just like __spiftire_access_error above, but it
126 * specifically handles correctable errors. If an
127 * uncorrectable error is indicated in the AFSR we will branch
128 * directly above to __spitfire_access_error to handle it
129 * instead. Uncorrectable therefore takes priority over
130 * correctable, and the error logging C code will notice this
131 * case by inspecting the trap type.
133 .type __spitfire_cee_trap,#function
135 ldxa [%g0] ASI_AFSR, %g4 ! Get AFSR
137 sllx %g3, SFAFSR_UE_SHIFT, %g3
138 andcc %g4, %g3, %g0 ! Check for UE
139 bne,pn %xcc, __spitfire_access_error
142 /* Ok, in this case we only have a correctable error.
143 * Indicate we only wish to capture that state in register
144 * %g1, and we only disable CE error reporting unlike UE
145 * handling which disables all errors.
147 ldxa [%g0] ASI_ESTATE_ERROR_EN, %g3
148 andn %g3, ESTATE_ERR_CE, %g3
149 stxa %g3, [%g0] ASI_ESTATE_ERROR_EN
152 /* Preserve AFSR in %g4, indicate UDB state to capture in %g1 */
153 ba,pt %xcc, __spitfire_cee_trap_continue
155 .size __spitfire_cee_trap,.-__spitfire_cee_trap
157 .type __spitfire_data_access_exception_tl1,#function
158 __spitfire_data_access_exception_tl1:
160 wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
163 ldxa [%g3] ASI_DMMU, %g4 ! Get SFSR
164 ldxa [%g5] ASI_DMMU, %g5 ! Get SFAR
165 stxa %g0, [%g3] ASI_DMMU ! Clear SFSR.FaultValid bit
168 cmp %g3, 0x80 ! first win spill/fill trap
170 cmp %g3, 0xff ! last win spill/fill trap
173 ba,pt %xcc, winfix_dax
175 1: sethi %hi(109f), %g7
177 109: or %g7, %lo(109b), %g7
180 call spitfire_data_access_exception_tl1
181 add %sp, PTREGS_OFF, %o0
184 .size __spitfire_data_access_exception_tl1,.-__spitfire_data_access_exception_tl1
186 .type __spitfire_data_access_exception,#function
187 __spitfire_data_access_exception:
189 wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
192 ldxa [%g3] ASI_DMMU, %g4 ! Get SFSR
193 ldxa [%g5] ASI_DMMU, %g5 ! Get SFAR
194 stxa %g0, [%g3] ASI_DMMU ! Clear SFSR.FaultValid bit
198 109: or %g7, %lo(109b), %g7
201 call spitfire_data_access_exception
202 add %sp, PTREGS_OFF, %o0
205 .size __spitfire_data_access_exception,.-__spitfire_data_access_exception
207 .type __spitfire_insn_access_exception_tl1,#function
208 __spitfire_insn_access_exception_tl1:
210 wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
212 ldxa [%g3] ASI_IMMU, %g4 ! Get SFSR
213 rdpr %tpc, %g5 ! IMMU has no SFAR, use TPC
214 stxa %g0, [%g3] ASI_IMMU ! Clear FaultValid bit
218 109: or %g7, %lo(109b), %g7
221 call spitfire_insn_access_exception_tl1
222 add %sp, PTREGS_OFF, %o0
225 .size __spitfire_insn_access_exception_tl1,.-__spitfire_insn_access_exception_tl1
227 .type __spitfire_insn_access_exception,#function
228 __spitfire_insn_access_exception:
230 wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
232 ldxa [%g3] ASI_IMMU, %g4 ! Get SFSR
233 rdpr %tpc, %g5 ! IMMU has no SFAR, use TPC
234 stxa %g0, [%g3] ASI_IMMU ! Clear FaultValid bit
238 109: or %g7, %lo(109b), %g7
241 call spitfire_insn_access_exception
242 add %sp, PTREGS_OFF, %o0
245 .size __spitfire_insn_access_exception,.-__spitfire_insn_access_exception