2 * Copyright (c) 2002 Jake Burkholder.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <machine/asm.h>
28 __FBSDID("$FreeBSD$");
30 #include <machine/asi.h>
31 #include <machine/asmacros.h>
32 #include <machine/intr_machdep.h>
33 #include <machine/ktr.h>
34 #include <machine/pstate.h>
35 #include <machine/ver.h>
40 * Handle a vectored interrupt.
42 * This is either a data bearing mondo vector interrupt, or a cross trap
43 * request from another cpu. In either case the hardware supplies an
44 * interrupt packet, in the form of 3 data words which are read from internal
45 * registers. A data bearing mondo vector packet consists of an interrupt
46 * number in the first data word, and zero in 2nd and 3rd. We use the
47 * interrupt number to find the function, argument and priority from the
48 * intr_vector table, allocate and fill in an intr_request from the per-cpu
49 * free list, link it onto the per-cpu active list and finally post a softint
50 * at the desired priority. Cross trap requests come in 2 forms, direct
51 * and queued. Direct requests are distinguished by the first data word
52 * being zero. The 2nd data word carries a function to call and the 3rd
53 * an argument to pass. The function is jumped to directly. It executes
54 * in nucleus context on interrupt globals and with all interrupts disabled,
55 * therefore it must be fast, and the things that it can do are limited.
56 * Queued cross trap requests are handled much like mondo vectors, except
57 * that the function, argument and priority are contained in the interrupt
58 * packet itself. They are distinguished by the upper 4 bits of the data
59 * word being non-zero, which specifies the priority of the softint to
63 * %g1 - pointer to intr_request
64 * %g2 - pointer to intr_vector, temp once required data is loaded
65 * %g3 - interrupt number for mondo vectors, unused otherwise
66 * %g4 - function, from the interrupt packet for cross traps, or
67 * loaded from the interrupt registers for mondo vecors
68 * %g5 - argument, as above for %g4
69 * %g6 - softint priority
73 * Load the interrupt packet from the hardware.
75 wr %g0, ASI_SDB_INTR_R, %asi
76 ldxa [%g0 + AA_SDB_INTR_D0] %asi, %g3
77 ldxa [%g0 + AA_SDB_INTR_D1] %asi, %g4
78 ldxa [%g0 + AA_SDB_INTR_D2] %asi, %g5
79 stxa %g0, [%g0] ASI_INTR_RECEIVE
83 * If the first data word is zero this is a direct cross trap request.
84 * The 2nd word points to code to execute and the 3rd is an argument
85 * to pass. Jump to it.
89 * NB: Zeus CPUs set some undocumented bits in the first data word.
91 and %g3, IV_MAX - 1, %g3
97 * If the high 4 bits of the 1st data word are non-zero, this is a
98 * queued cross trap request to be delivered as a softint. The high
99 * 4 bits of the 1st data word specify a priority, and the 2nd and
100 * 3rd a function and argument.
107 * Find the function, argument and desired priority from the
110 SET(intr_vectors, %g4, %g2)
111 sllx %g3, IV_SHIFT, %g4
114 ldx [%g2 + IV_FUNC], %g4
115 ldx [%g2 + IV_ARG], %g5
116 lduw [%g2 + IV_PRI], %g6
119 * Get an intr_request from the free list. There should always be one
120 * unless we are getting an interrupt storm from stray interrupts, in
121 * which case the we will deference a NULL pointer and panic.
123 2: ldx [PCPU(IRFREE)], %g1
124 ldx [%g1 + IR_NEXT], %g2
125 stx %g2, [PCPU(IRFREE)]
128 * Store the vector number, function, argument and priority.
130 stw %g3, [%g1 + IR_VEC]
131 stx %g4, [%g1 + IR_FUNC]
132 stx %g5, [%g1 + IR_ARG]
133 stw %g6, [%g1 + IR_PRI]
136 * Link it onto the end of the active list.
138 stx %g0, [%g1 + IR_NEXT]
139 ldx [PCPU(IRTAIL)], %g4
141 add %g1, IR_NEXT, %g1
142 stx %g1, [PCPU(IRTAIL)]
145 * Trigger a softint at the level indicated by the priority.
149 wr %g1, 0, %set_softint
152 * Done, retry the instruction.
157 ENTRY(intr_vector_stray)
159 * SPARC64-VI trigger stray vector interrupts in order to indicate
160 * uncorrectable errors in interrupt packets, which still need to be
161 * acknowledged though.
162 * US-IV occasionally trigger stray vector interrupts for reasons
163 * unknown accompanied by a state in which they even fault on locked
164 * TLB entries so we can't even log these here. Just retrying the
165 * instruction in that case gets the CPU back on track.
168 srlx %g1, VER_IMPL_SHIFT, %g1
169 sll %g1, VER_IMPL_SIZE, %g1
170 srl %g1, VER_IMPL_SIZE, %g1
171 cmp %g1, CPU_IMPL_SPARC64VI
174 stxa %g0, [%g0] ASI_INTR_RECEIVE
178 END(intr_vector_stray)
181 save %sp, -CCFSZ, %sp
184 * Disable interrupts while we fiddle with the interrupt request lists
185 * as interrupts at levels higher than what got us here aren't blocked.
187 1: wrpr %g0, PSTATE_NORMAL, %pstate
189 ldx [PCPU(IRHEAD)], %l0
193 wrpr %g0, PSTATE_KERNEL, %pstate
198 2: ldx [%l0 + IR_NEXT], %l1
200 stx %l1, [PCPU(IRHEAD)]
201 PCPU_ADDR(IRHEAD, %l1)
202 stx %l1, [PCPU(IRTAIL)]
204 3: ldx [%l0 + IR_FUNC], %o0
205 ldx [%l0 + IR_ARG], %o1
206 lduw [%l0 + IR_VEC], %l2
208 ldx [PCPU(IRFREE)], %l1
209 stx %l1, [%l0 + IR_NEXT]
210 stx %l0, [PCPU(IRFREE)]
212 wrpr %g0, PSTATE_KERNEL, %pstate
214 KASSERT(%o0, "intr_fast: ir_func null")
218 /* intrcnt[intr_countp[%l2]]++ */
219 SET(intrcnt, %l7, %l3) /* %l3 = intrcnt */
220 prefetcha [%l3] ASI_N, 1
221 SET(intr_countp, %l7, %l4) /* %l4 = intr_countp */
222 sllx %l2, 1, %l2 /* %l2 = vec << 1 */
223 lduh [%l4 + %l2], %l4 /* %l4 = intr_countp[%l2] */
224 sllx %l4, 3, %l4 /* %l4 = intr_countp[%l2] << 3 */
225 add %l4, %l3, %l4 /* %l4 = intrcnt[intr_countp[%l2]] */