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x86 timeout test: consider instable tsc (quickfix)

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This is a quickfix to avoid testing microseconds precise time on older x86
machines that have no invariant TSC as interpolation source.

Ref #2400
This commit is contained in:
Martin Stein 2017-08-25 18:05:32 +02:00 committed by Christian Helmuth
parent fd344eb273
commit 12eb7a44d0
2 changed files with 36 additions and 1 deletions
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6
repos/os/run/timeout.run
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@ -32,6 +32,12 @@ proc precise_time { } {
# time instead.
#
if {[expr [have_spec arm] && ![have_spec hw]]} { return false }
#
# Older x86 machines do not have an invariant timestamp
#
if {[have_spec x86] && ![have_spec hw]} { return dynamic }
return true
}

31
repos/os/src/test/timeout/main.cc
View File

@ -22,6 +22,35 @@
using namespace Genode;
/**
* FIXME
* This function and its use are a quickfix that avoid refactorization of the
* timeout framework respectively the timeout test for now. It should be
* replaced in the near future by a solution that is part of the base lib and
* thus can be implemented the clean way in platform specific files.
*/
static bool precise_time(Xml_node config)
{
String<32> attr = config.attribute_value("precise_time", String<32>("false"));
if (attr == "true") { return true; }
if (attr == "false") { return false; }
if (attr == "dynamic") {
#ifdef __x86_64__
unsigned long cpuid = 0x80000007, edx = 0;
asm volatile ("cpuid" : "+a" (cpuid), "=d" (edx) : : "rbx", "rcx");
return edx & 0x100;
#elif __i386__
unsigned long cpuid = 0x80000007, edx = 0;
asm volatile ("push %%ebx \n"
"cpuid \n"
"pop %%ebx" : "+a" (cpuid), "=d" (edx) : : "ecx");
return edx & 0x100;
#endif
}
return false;
}
struct Test
{
Env &env;
@ -553,7 +582,7 @@ struct Fast_polling : Test
main_ep(env, STACK_SIZE, "fast_polling_ep"),
main_handler(main_ep, *this, &Fast_polling::main)
{
if (config.xml().attribute_value("precise_time", true)) {
if (precise_time(config.xml())) {
Signal_transmitter(main_handler).submit();
} else {
log("... skip test, requires the platform to support precise time");