interrupt.S revision 241740
1/*-
2 * Copyright (c) 2002 Jake Burkholder.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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
24 * SUCH DAMAGE.
25 */
26
27#include <machine/asm.h>
28__FBSDID("$FreeBSD: head/sys/sparc64/sparc64/interrupt.S 241740 2012-10-19 17:12:55Z marius $");
29
30#include <machine/asi.h>
31#include <machine/asmacros.h>
32#include <machine/intr_machdep.h>
33#include <machine/pstate.h>
34#include <machine/ver.h>
35
36#include "assym.s"
37
38/*
39 * Handle a vectored interrupt.
40 *
41 * This is either a data bearing mondo vector interrupt, or a cross trap
42 * request from another cpu.  In either case the hardware supplies an
43 * interrupt packet, in the form of 3 data words which are read from internal
44 * registers.  A data bearing mondo vector packet consists of an interrupt
45 * number in the first data word, and zero in 2nd and 3rd.  We use the
46 * interrupt number to find the function, argument and priority from the
47 * intr_vector table, allocate and fill in an intr_request from the per-cpu
48 * free list, link it onto the per-cpu active list and finally post a softint
49 * at the desired priority.  Cross trap requests come in 2 forms, direct
50 * and queued.  Direct requests are distinguished by the first data word
51 * being zero.  The 2nd data word carries a function to call and the 3rd
52 * an argument to pass.  The function is jumped to directly.  It executes
53 * in nucleus context on interrupt globals and with all interrupts disabled,
54 * therefore it must be fast, and the things that it can do are limited.
55 * Queued cross trap requests are handled much like mondo vectors, except
56 * that the function, argument and priority are contained in the interrupt
57 * packet itself.  They are distinguished by the upper 4 bits of the data
58 * word being non-zero, which specifies the priority of the softint to
59 * deliver.
60 *
61 * Register usage:
62 *	%g1 - pointer to intr_request
63 *	%g2 - pointer to intr_vector, temp once required data is loaded
64 *	%g3 - interrupt number for mondo vectors, unused otherwise
65 *	%g4 - function, from the interrupt packet for cross traps, or
66 *	      loaded from the interrupt registers for mondo vecors
67 *	%g5 - argument, as above for %g4
68 *	%g6 - softint priority
69 */
70ENTRY(intr_vector)
71	/*
72	 * Load the interrupt packet from the hardware.
73	 */
74	wr	%g0, ASI_SDB_INTR_R, %asi
75	ldxa	[%g0 + AA_SDB_INTR_D0] %asi, %g3
76	ldxa	[%g0 + AA_SDB_INTR_D1] %asi, %g4
77	ldxa	[%g0 + AA_SDB_INTR_D2] %asi, %g5
78	stxa	%g0, [%g0] ASI_INTR_RECEIVE
79	membar	#Sync
80
81	/*
82	 * If the first data word is zero this is a direct cross trap request.
83	 * The 2nd word points to code to execute and the 3rd is an argument
84	 * to pass.  Jump to it.
85	 */
86	brnz,a,pt %g3, 1f
87	 srlx	%g3, 60, %g6
88	/*
89	 * NB: Zeus CPUs set some undocumented bits in the first data word.
90	 */
91	jmpl	%g4, %g0
92	 and	%g3, IV_MAX - 1, %g3
93	/* NOTREACHED */
94
95	/*
96	 * If the high 4 bits of the 1st data word are non-zero, this is a
97	 * queued cross trap request to be delivered as a softint.  The high
98	 * 4 bits of the 1st data word specify a priority, and the 2nd and
99	 * 3rd a function and argument.
100	 */
1011:	brnz,a,pn %g6, 2f
102	 clr	%g3
103
104	/*
105	 * Find the function, argument and desired priority from the
106	 * intr_vector table.
107	 */
108	SET(intr_vectors, %g4, %g2)
109	sllx	%g3, IV_SHIFT, %g4
110	add	%g2, %g4, %g2
111
112	ldx	[%g2 + IV_FUNC], %g4
113	ldx	[%g2 + IV_ARG], %g5
114	lduw	[%g2 + IV_PRI], %g6
115
116	/*
117	 * Get an intr_request from the free list.  There should always be one
118	 * unless we are getting an interrupt storm from stray interrupts, in
119	 * which case the we will deference a NULL pointer and panic.
120	 */
1212:	ldx	[PCPU(IRFREE)], %g1
122	ldx	[%g1 + IR_NEXT], %g2
123	stx	%g2, [PCPU(IRFREE)]
124
125	/*
126	 * Store the vector number, function, argument and priority.
127	 */
128	stw	%g3, [%g1 + IR_VEC]
129	stx	%g4, [%g1 + IR_FUNC]
130	stx	%g5, [%g1 + IR_ARG]
131	stw	%g6, [%g1 + IR_PRI]
132
133	/*
134	 * Link it onto the end of the active list.
135	 */
136	stx	%g0, [%g1 + IR_NEXT]
137	ldx	[PCPU(IRTAIL)], %g4
138	stx	%g1, [%g4]
139	add	%g1, IR_NEXT, %g1
140	stx	%g1, [PCPU(IRTAIL)]
141
142	/*
143	 * Trigger a softint at the level indicated by the priority.
144	 */
145	mov	1, %g1
146	sllx	%g1, %g6, %g1
147	wr	%g1, 0, %set_softint
148
149	/*
150	 * Done, retry the instruction.
151	 */
152	retry
153END(intr_vector)
154
155ENTRY(intr_vector_stray)
156	/*
157	 * SPARC64-VI trigger stray vector interrupts in order to indicate
158	 * uncorrectable errors in interrupt packets, which still need to be
159	 * acknowledged though.
160	 * US-IV occasionally trigger stray vector interrupts for reasons
161	 * unknown accompanied by a state in which they even fault on locked
162	 * TLB entries so we can't even log these here.  Just retrying the
163	 * instruction in that case gets the CPU back on track.
164	 */
165	rdpr	%ver, %g1
166	srlx	%g1, VER_IMPL_SHIFT, %g1
167	sll	%g1, VER_IMPL_SIZE, %g1
168	srl	%g1, VER_IMPL_SIZE, %g1
169	cmp	%g1, CPU_IMPL_SPARC64VI
170	bne,a,pn %icc, 1f
171	 nop
172	stxa	%g0, [%g0] ASI_INTR_RECEIVE
173	membar	#Sync
174
1751:	retry
176END(intr_vector_stray)
177
178ENTRY(intr_fast)
179	save	%sp, -CCFSZ, %sp
180
181	/*
182	 * Disable interrupts while we fiddle with the interrupt request lists
183	 * as interrupts at levels higher than what got us here aren't blocked.
184	 */
1851:	wrpr	%g0, PSTATE_NORMAL, %pstate
186
187	ldx	[PCPU(IRHEAD)], %l0
188	brnz,a,pt %l0, 2f
189	 nop
190
191	wrpr	%g0, PSTATE_KERNEL, %pstate
192
193	ret
194	 restore
195
1962:	ldx	[%l0 + IR_NEXT], %l1
197	brnz,pt	%l1, 3f
198	 stx	%l1, [PCPU(IRHEAD)]
199	PCPU_ADDR(IRHEAD, %l1)
200	stx	%l1, [PCPU(IRTAIL)]
201
2023:	ldx	[%l0 + IR_FUNC], %o0
203	ldx	[%l0 + IR_ARG], %o1
204	lduw	[%l0 + IR_VEC], %l2
205
206	ldx	[PCPU(IRFREE)], %l1
207	stx	%l1, [%l0 + IR_NEXT]
208	stx	%l0, [PCPU(IRFREE)]
209
210	wrpr	%g0, PSTATE_KERNEL, %pstate
211
212	KASSERT(%o0, "intr_fast: ir_func null")
213	call	%o0
214	 mov	%o1, %o0
215
216	/* intrcnt[intr_countp[%l2]]++ */
217	SET(intrcnt, %l7, %l3)		/* %l3 = intrcnt */
218	prefetcha [%l3] ASI_N, 1
219	SET(intr_countp, %l7, %l4)	/* %l4 = intr_countp */
220	sllx	%l2, 1, %l2		/* %l2 = vec << 1 */
221	lduh	[%l4 + %l2], %l4	/* %l4 = intr_countp[%l2] */
222	sllx	%l4, 3, %l4		/* %l4 = intr_countp[%l2] << 3 */
223	add	%l4, %l3, %l4		/* %l4 = intrcnt[intr_countp[%l2]] */
224	ldx	[%l4], %l2
225	inc	%l2
226	stx	%l2, [%l4]
227
228	ba,a	%xcc, 1b
229	 nop
230END(intr_fast)
231