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target/riscv: Add the checking into stimecmp write function.

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Preparation commit to let aclint timer to use stimecmp write function.
Aclint timer doesn't call sstc() predicate so we need to check inside
the stimecmp write function.

Signed-off-by: Jim Shu <jim.shu@sifive.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250519143518.11086-2-jim.shu@sifive.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Jim Shu
2025-07-04 21:09:48 +10:00
committed by Alistair Francis
parent c77283dd5d
commit 6eba6fe967
1 changed files with 17 additions and 2 deletions
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target/riscv/time_helper.c
+17 -2
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@@ -46,8 +46,23 @@ void riscv_timer_write_timecmp(CPURISCVState *env, QEMUTimer *timer,
{
uint64_t diff, ns_diff, next;
RISCVAclintMTimerState *mtimer = env->rdtime_fn_arg;
uint32_t timebase_freq = mtimer->timebase_freq;
uint64_t rtc_r = env->rdtime_fn(env->rdtime_fn_arg) + delta;
uint32_t timebase_freq;
uint64_t rtc_r;
if (!riscv_cpu_cfg(env)->ext_sstc || !env->rdtime_fn ||
!env->rdtime_fn_arg || !get_field(env->menvcfg, MENVCFG_STCE)) {
/* S/VS Timer IRQ depends on sstc extension, rdtime_fn(), and STCE. */
return;
}
if (timer_irq == MIP_VSTIP &&
(!riscv_has_ext(env, RVH) || !get_field(env->henvcfg, HENVCFG_STCE))) {
/* VS Timer IRQ also depends on RVH and henvcfg.STCE. */
return;
}
timebase_freq = mtimer->timebase_freq;
rtc_r = env->rdtime_fn(env->rdtime_fn_arg) + delta;
if (timecmp <= rtc_r) {
/*