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1 /*-
2  * Copyright (c) 2001 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 <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include "opt_pmap.h"
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/ktr.h>
35 #include <sys/linker_set.h>
36 #include <sys/pcpu.h>
37 #include <sys/lock.h>
38 #include <sys/mutex.h>
39 #include <sys/smp.h>
40 #include <sys/sysctl.h>
41
42 #include <vm/vm.h>
43 #include <vm/pmap.h>
44
45 #include <machine/pmap.h>
46 #include <machine/smp.h>
47 #include <machine/tlb.h>
48
49 PMAP_STATS_VAR(tlb_ncontext_demap);
50 PMAP_STATS_VAR(tlb_npage_demap);
51 PMAP_STATS_VAR(tlb_nrange_demap);
52
53 tlb_flush_nonlocked_t *tlb_flush_nonlocked;
54 tlb_flush_user_t *tlb_flush_user;
55
56 /*
57  * Some tlb operations must be atomic, so no interrupt or trap can be allowed
58  * while they are in progress. Traps should not happen, but interrupts need to
59  * be explicitely disabled. critical_enter() cannot be used here, since it only
60  * disables soft interrupts.
61  */
62
63 void
64 tlb_context_demap(struct pmap *pm)
65 {
66         void *cookie;
67         u_long s;
68
69         /*
70          * It is important that we are not interrupted or preempted while
71          * doing the IPIs. The interrupted CPU may hold locks, and since
72          * it will wait for the CPU that sent the IPI, this can lead
73          * to a deadlock when an interrupt comes in on that CPU and it's
74          * handler tries to grab one of that locks. This will only happen for
75          * spin locks, but these IPI types are delivered even if normal
76          * interrupts are disabled, so the lock critical section will not
77          * protect the target processor from entering the IPI handler with
78          * the lock held.
79          */
80         PMAP_STATS_INC(tlb_ncontext_demap);
81         cookie = ipi_tlb_context_demap(pm);
82         if (pm->pm_active & PCPU_GET(cpumask)) {
83                 KASSERT(pm->pm_context[PCPU_GET(cpuid)] != -1,
84                     ("tlb_context_demap: inactive pmap?"));
85                 s = intr_disable();
86                 stxa(TLB_DEMAP_PRIMARY | TLB_DEMAP_CONTEXT, ASI_DMMU_DEMAP, 0);
87                 stxa(TLB_DEMAP_PRIMARY | TLB_DEMAP_CONTEXT, ASI_IMMU_DEMAP, 0);
88                 membar(Sync);
89                 intr_restore(s);
90         }
91         ipi_wait(cookie);
92 }
93
94 void
95 tlb_page_demap(struct pmap *pm, vm_offset_t va)
96 {
97         u_long flags;
98         void *cookie;
99         u_long s;
100
101         PMAP_STATS_INC(tlb_npage_demap);
102         cookie = ipi_tlb_page_demap(pm, va);
103         if (pm->pm_active & PCPU_GET(cpumask)) {
104                 KASSERT(pm->pm_context[PCPU_GET(cpuid)] != -1,
105                     ("tlb_page_demap: inactive pmap?"));
106                 if (pm == kernel_pmap)
107                         flags = TLB_DEMAP_NUCLEUS | TLB_DEMAP_PAGE;
108                 else
109                         flags = TLB_DEMAP_PRIMARY | TLB_DEMAP_PAGE;
110
111                 s = intr_disable();
112                 stxa(TLB_DEMAP_VA(va) | flags, ASI_DMMU_DEMAP, 0);
113                 stxa(TLB_DEMAP_VA(va) | flags, ASI_IMMU_DEMAP, 0);
114                 membar(Sync);
115                 intr_restore(s);
116         }
117         ipi_wait(cookie);
118 }
119
120 void
121 tlb_range_demap(struct pmap *pm, vm_offset_t start, vm_offset_t end)
122 {
123         vm_offset_t va;
124         void *cookie;
125         u_long flags;
126         u_long s;
127
128         PMAP_STATS_INC(tlb_nrange_demap);
129         cookie = ipi_tlb_range_demap(pm, start, end);
130         if (pm->pm_active & PCPU_GET(cpumask)) {
131                 KASSERT(pm->pm_context[PCPU_GET(cpuid)] != -1,
132                     ("tlb_range_demap: inactive pmap?"));
133                 if (pm == kernel_pmap)
134                         flags = TLB_DEMAP_NUCLEUS | TLB_DEMAP_PAGE;
135                 else
136                         flags = TLB_DEMAP_PRIMARY | TLB_DEMAP_PAGE;
137
138                 s = intr_disable();
139                 for (va = start; va < end; va += PAGE_SIZE) {
140                         stxa(TLB_DEMAP_VA(va) | flags, ASI_DMMU_DEMAP, 0);
141                         stxa(TLB_DEMAP_VA(va) | flags, ASI_IMMU_DEMAP, 0);
142                         membar(Sync);
143                 }
144                 intr_restore(s);
145         }
146         ipi_wait(cookie);
147 }