source: trunk/packages/xen-3.1/xen-3.1/xen/arch/powerpc/exceptions.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: 2.9 KB
Line 
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
15 *
16 * Copyright (C) IBM Corp. 2005, 2006
17 *
18 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
19 *          Jimi Xenidis <jimix@watson.ibm.com>
20 */
21
22#include <xen/config.h>
23#include <xen/softirq.h>
24#include <xen/sched.h>
25#include <xen/serial.h>
26#include <xen/gdbstub.h>
27#include <xen/console.h>
28#include <xen/shutdown.h>
29#include <asm/time.h>
30#include <asm/processor.h>
31#include <asm/debugger.h>
32
33#undef DEBUG
34
35extern ulong ppc_do_softirq(ulong orig_msr);
36extern void do_timer(struct cpu_user_regs *regs);
37extern void do_dec(struct cpu_user_regs *regs);
38extern void program_exception(struct cpu_user_regs *regs,
39                              unsigned long cookie);
40extern int reprogram_timer(s_time_t timeout); 
41
42int hdec_sample = 0;
43
44void do_timer(struct cpu_user_regs *regs)
45{
46    /* Set HDEC high so it stops firing and can be reprogrammed by
47     * set_preempt() */
48    /* FIXME! HACK ALERT!
49     *
50     * We have a bug in that if we switch domains in schedule() we
51     * switch right away regardless of whatever else is pending.  This
52     * means that if the timer goes off while in schedule(), the next
53     * domain will be preempted by the interval defined below.  So
54     * until we fix our cotnext_switch(), the follow workaround will
55     * make sure that the domain we switch to does not run for to long
56     * so we can continue to service the other timers in the timer
57     * queue and that the value is long enough to escape this
58     * particular timer event.
59     */
60    reprogram_timer(NOW() + MILLISECS(1));
61
62    raise_softirq(TIMER_SOFTIRQ);
63}
64
65void do_dec(struct cpu_user_regs *regs)
66{
67    if (!(regs->msr & MSR_HV)) {
68        panic("HV dec from domain\n");
69    }
70    printk("DEC_HV: pc: 0x%lx lr: 0x%lx \n", regs->pc, regs->lr);
71    mtdec(INT_MAX);
72}
73
74void program_exception(struct cpu_user_regs *regs, unsigned long cookie)
75{
76    if (cookie == 0x200) {
77        if (cpu_machinecheck(regs))
78            return;
79
80        printk("%s: machine check\n", __func__);
81    } else {
82#ifdef CRASH_DEBUG
83        if (__trap_to_gdb(regs, cookie) == 0)
84            return;
85#endif /* CRASH_DEBUG */
86
87        printk("%s: type: 0x%lx\n", __func__, cookie);
88        show_backtrace_regs(regs);
89    }
90    machine_halt();
91}
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