source: trunk/packages/xen-3.1/xen-3.1/xen/arch/ia64/xen/flushtlb.c @ 34

Last change on this file since 34 was 34, checked in by hartmans, 18 years ago

Add xen and xen-common

File size: 2.4 KB
Line 
1/******************************************************************************
2 * flushtlb.c
3 * based on x86 flushtlb.c
4 *
5 * Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
6 *                    VA Linux Systems Japan K.K.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21 *
22 */
23
24#include <xen/sched.h>
25#include <xen/softirq.h>
26#include <asm/vcpu.h>
27#include <asm/vhpt.h>
28#include <asm/flushtlb.h>
29
30/* Debug builds: Wrap frequently to stress-test the wrap logic. */
31#ifdef NDEBUG
32#define WRAP_MASK (0xFFFFFFFFU)
33#else
34#define WRAP_MASK (0x000003FFU)
35#endif
36
37volatile u32 tlbflush_clock = 1U; /* 1 greater than tlbflush_time. */
38DEFINE_PER_CPU(volatile u32, tlbflush_time);
39
40u32
41tlbflush_clock_inc_and_return(void)
42{
43    u32 t, t1, t2;
44
45    t = tlbflush_clock;
46    do {
47        t1 = t2 = t;
48        /* Clock wrapped: someone else is leading a global TLB shootdown. */
49        if (unlikely(t1 == 0))
50            return t2;
51        t2 = (t + 1) & WRAP_MASK;
52        t = ia64_cmpxchg(acq, &tlbflush_clock, t1, t2, sizeof(tlbflush_clock));
53    } while (unlikely(t != t1));
54
55    /* Clock wrapped: we will lead a global TLB shootdown. */
56    if (unlikely(t2 == 0))
57        raise_softirq(NEW_TLBFLUSH_CLOCK_PERIOD_SOFTIRQ);
58
59    return t2;
60}
61
62static void
63tlbflush_clock_local_flush(void *unused)
64{
65    local_vhpt_flush();
66    local_flush_tlb_all();
67}
68
69void
70new_tlbflush_clock_period(void)
71{
72    /* flush all vhpt of physical cpu and mTLB */
73    on_each_cpu(tlbflush_clock_local_flush, NULL, 1, 1);
74
75    /*
76     * if global TLB shootdown is finished, increment tlbflush_time
77     * atomic operation isn't necessary because we know that tlbflush_clock
78     * stays 0.
79     */
80    tlbflush_clock++;
81}
82
83/*
84 * Local variables:
85 * mode: C
86 * c-set-style: "BSD"
87 * c-basic-offset: 4
88 * tab-width: 4
89 * indent-tabs-mode: nil
90 * End:
91 */
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