Revision ab8131af
| b/hw/ppc/ppc_booke.c | ||
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| 131 | 131 |
struct QEMUTimer *timer) |
| 132 | 132 |
{
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ppc_tb_t *tb_env = env->tb_env; |
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uint64_t lapse;
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uint64_t delta_tick, ticks = 0;
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uint64_t tb; |
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uint64_t period = 1 << (target_bit + 1);
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uint64_t period; |
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uint64_t now; |
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now = qemu_get_clock_ns(vm_clock); |
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tb = cpu_ppc_get_tb(tb_env, now, tb_env->tb_offset); |
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period = 1ULL << target_bit; |
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delta_tick = period - (tb & (period - 1)); |
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| 141 | 143 |
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lapse = period - ((tb - (1 << target_bit)) & (period - 1)); |
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/* the timer triggers only when the selected bit toggles from 0 to 1 */ |
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if (tb & period) {
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ticks = period; |
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} |
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| 143 | 148 |
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*next = now + muldiv64(lapse, get_ticks_per_sec(), tb_env->tb_freq); |
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if (ticks + delta_tick < ticks) {
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/* Overflow, so assume the biggest number we can express. */ |
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ticks = UINT64_MAX; |
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} else {
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ticks += delta_tick; |
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} |
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*next = now + muldiv64(ticks, get_ticks_per_sec(), tb_env->tb_freq); |
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if ((*next < now) || (*next > INT64_MAX)) {
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/* Overflow, so assume the biggest number the qemu timer supports. */ |
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*next = INT64_MAX; |
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} |
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| 145 | 161 |
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| 146 | 162 |
/* XXX: If expire time is now. We can't run the callback because we don't |
| 147 | 163 |
* have access to it. So we just set the timer one nanosecond later. |
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