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