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cpu_session: follow-up fix for scale_priority

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This is a fixup for commit 5a42f40f04981581327639a75298e9e653ef39f5.

ref #961
This commit is contained in:
Stefan Kalkowski 2013-11-21 12:17:11 +01:00 committed by Norman Feske
parent 54667241f7
commit 0c6c70a612
1 changed files with 12 additions and 3 deletions
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15
base/include/cpu_session/cpu_session.h
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@ -199,12 +199,21 @@ namespace Genode {
* be power of 2
* \param prio generic priority value as used by the CPU
* session interface
* \param inverse order of platform priorities, if true
* 'pf_prio_limit' corresponds to the highest
* priority, otherwise it refers to the
* lowest priority.
* \return platform-specific priority value
*/
static unsigned scale_priority(unsigned pf_prio_limit, unsigned prio)
static unsigned scale_priority(unsigned pf_prio_limit, unsigned prio,
bool inverse = true)
{
/* if no priorities are used, use the platform priority limit */
if (prio == 0) return pf_prio_limit;
/*
* Generic priority values are (0 is highest, 'PRIORITY_LIMIT'
* is lowest. On platforms where priority levels are defined
* the other way round, we have to invert the priority value.
*/
prio = inverse ? Cpu_session::PRIORITY_LIMIT - prio : prio;
/* scale value to platform priority range 0..pf_prio_limit */
return (prio*pf_prio_limit)/Cpu_session::PRIORITY_LIMIT;