diff options
| -rw-r--r-- | hw/mips/cputimer.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/hw/mips/cputimer.c b/hw/mips/cputimer.c index 1603600118..ba9264b415 100644 --- a/hw/mips/cputimer.c +++ b/hw/mips/cputimer.c @@ -33,13 +33,18 @@ uint32_t cpu_mips_get_random (CPUMIPSState *env) static uint32_t seed = 1; static uint32_t prev_idx = 0; uint32_t idx; + uint32_t nb_rand_tlb = env->tlb->nb_tlb - env->CP0_Wired; + + if (nb_rand_tlb == 1) { + return env->tlb->nb_tlb - 1; + } + /* Don't return same value twice, so get another value */ do { /* Use a simple algorithm of Linear Congruential Generator * from ISO/IEC 9899 standard. */ seed = 1103515245 * seed + 12345; - idx = (seed >> 16) % (env->tlb->nb_tlb - env->CP0_Wired) + - env->CP0_Wired; + idx = (seed >> 16) % nb_rand_tlb + env->CP0_Wired; } while (idx == prev_idx); prev_idx = idx; return idx; |