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hw: increase timing accuracy of kernel (fix #3081)

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* Introduce 64-bit tick counter
* Let the timer always count when possible, also if it already fired
* Simplify the kernel syscall API to have one current time call,
  which returns the elapsed microseconds since boot
This commit is contained in:
Stefan Kalkowski
2019-02-21 17:23:10 +01:00
committed by Christian Helmuth
parent 2ecf1d887b
commit 80fa23da5e
35 changed files with 316 additions and 439 deletions
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20
repos/base-hw/include/kernel/interface.h
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@ -40,7 +40,6 @@ namespace Kernel
constexpr Call_arg call_id_ack_cap() { return 14; }
constexpr Call_arg call_id_delete_cap() { return 15; }
constexpr Call_arg call_id_timeout() { return 16; }
constexpr Call_arg call_id_timeout_age_us() { return 17; }
constexpr Call_arg call_id_timeout_max_us() { return 18; }
constexpr Call_arg call_id_time() { return 19; }
@ -80,6 +79,8 @@ namespace Kernel
Call_arg arg_4,
Call_arg arg_5);
Call_ret_64 call64(Call_arg arg_0);
/**
* Install timeout for calling thread
@ -90,23 +91,12 @@ namespace Kernel
* This call always overwrites the last timeout installed by the thread
* if any.
*/
inline int timeout(time_t const duration_us, capid_t const sigid)
inline int timeout(timeout_t const duration_us, capid_t const sigid)
{
return call(call_id_timeout(), duration_us, sigid);
}
/**
* Return time in microseconds since the caller installed its last timeout
*
* Must not be called if the installation is older than 'timeout_max_us'.
*/
inline time_t timeout_age_us()
{
return call(call_id_timeout_age_us());
}
/**
* Return value of a free-running, uniform counter
*
@ -115,7 +105,7 @@ namespace Kernel
*/
inline time_t time()
{
return call(call_id_time());
return call64(call_id_time());
}
@ -127,7 +117,7 @@ namespace Kernel
*/
inline time_t timeout_max_us()
{
return call(call_id_timeout_max_us());
return call64(call_id_timeout_max_us());
}