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hw/ppc: fix decrementer with BookE timers 

The BookE decrementer stops at 0, meaning that it won't decremented
towards "negative" values. However, the current logic is inverted: decr
is updated solely when the resulting value would be negative.

Signed-off-by: Clément Chigot <chigot@adacore.com>
Fixes: 8e0a5ac878 ("hw/ppc: Avoid decrementer rounding errors")
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Clément Chigot 2024-07-15 10:46:39 +02:00 committed by Nicholas Piggin
parent ddf4dd46e5
commit f10827a845
1 changed files with 3 additions and 1 deletions
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4
hw/ppc/ppc.c
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@ -728,7 +728,9 @@ static inline int64_t __cpu_ppc_load_decr(CPUPPCState *env, int64_t now,
int64_t decr;
n = ns_to_tb(tb_env->decr_freq, now);
if (next > n && tb_env->flags & PPC_TIMER_BOOKE) {
/* BookE timers stop when reaching 0. */
if (next < n && tb_env->flags & PPC_TIMER_BOOKE) {
decr = 0;
} else {
decr = next - n;