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hw/intc: Fix upper/lower mtime write calculation

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When writing the upper mtime, we should keep the original lower mtime
whose value is given by cpu_riscv_read_rtc() instead of
cpu_riscv_read_rtc_raw(). The same logic applies to writes to lower mtime.

Signed-off-by: Jason Chien <jason.chien@sifive.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20230728082502.26439-1-jason.chien@sifive.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Jason Chien 2023-07-28 08:24:38 +00:00 • committed by Alistair Francis
parent eda633a534
commit e0922b73ba
1 changed files with 3 additions and 2 deletions
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5
hw/intc/riscv_aclint.c
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@ -208,11 +208,12 @@ static void riscv_aclint_mtimer_write(void *opaque, hwaddr addr,
return; return;
} else if (addr == mtimer->time_base || addr == mtimer->time_base + 4) { } else if (addr == mtimer->time_base || addr == mtimer->time_base + 4) {
uint64_t rtc_r = cpu_riscv_read_rtc_raw(mtimer->timebase_freq); uint64_t rtc_r = cpu_riscv_read_rtc_raw(mtimer->timebase_freq);
uint64_t rtc = cpu_riscv_read_rtc(mtimer);
if (addr == mtimer->time_base) { if (addr == mtimer->time_base) {
if (size == 4) { if (size == 4) {
/* time_lo for RV32/RV64 */ /* time_lo for RV32/RV64 */
mtimer->time_delta = ((rtc_r & ~0xFFFFFFFFULL) | value) - rtc_r; mtimer->time_delta = ((rtc & ~0xFFFFFFFFULL) | value) - rtc_r;
} else { } else {
/* time for RV64 */ /* time for RV64 */
mtimer->time_delta = value - rtc_r; mtimer->time_delta = value - rtc_r;
@ -220,7 +221,7 @@ static void riscv_aclint_mtimer_write(void *opaque, hwaddr addr,
} else { } else {
if (size == 4) { if (size == 4) {
/* time_hi for RV32/RV64 */ /* time_hi for RV32/RV64 */
mtimer->time_delta = (value << 32 | (rtc_r & 0xFFFFFFFF)) - rtc_r; mtimer->time_delta = (value << 32 | (rtc & 0xFFFFFFFF)) - rtc_r;
} else { } else {
qemu_log_mask(LOG_GUEST_ERROR, qemu_log_mask(LOG_GUEST_ERROR,
"aclint-mtimer: invalid time_hi write: %08x", "aclint-mtimer: invalid time_hi write: %08x",