diff options
Diffstat (limited to 'payloads')
| -rw-r--r-- | payloads/libpayload/drivers/timer/img_pistachio.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/payloads/libpayload/drivers/timer/img_pistachio.c b/payloads/libpayload/drivers/timer/img_pistachio.c index ae53a9d0b1..9257bfef4c 100644 --- a/payloads/libpayload/drivers/timer/img_pistachio.c +++ b/payloads/libpayload/drivers/timer/img_pistachio.c @@ -27,5 +27,16 @@ uint64_t timer_hz(void) uint64_t timer_raw_value(void) { - return read_c0_count() * 2; + static uint64_t total_ticks = 0; + uint8_t overflow = 0; + uint32_t current_ticks = read_c0_count() * 2; + + /* It assumes only one overflow happened since the last call */ + if (current_ticks <= (uint32_t)total_ticks) + overflow = 1; + /* The least significant part(32 bits) of total_ticks will always + * become equal to current ticks */ + total_ticks = (((total_ticks >> 32) + overflow) << 32) + + current_ticks; + return total_ticks; } |