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arch: arc: do not use sleep instruction for nsim smp

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It's found that in nsim_hs_smp, sometimes the cpu
doesn't response inter-core interrupt after executing sleep
instruction.

It may be a bug of nsim, but needs more time to
investigate the root of this issue.

This commit is a workround for this, as nsim is just an
instruction simulator, no direct impact.

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
This commit is contained in:
Wayne Ren 2019-10-14 22:16:35 +08:00 committed by Andrew Boie
parent 63d3828fa3
commit d56a12d955
1 changed files with 12 additions and 0 deletions
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12
arch/arc/core/cpu_idle.S
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@ -43,7 +43,19 @@ SECTION_FUNC(TEXT, arch_cpu_idle)
ld r1, [z_arc_cpu_sleep_mode]
or r1, r1, (1 << 4) /* set IRQ-enabled bit */
/*
* It's found that (in nsim_hs_smp), when cpu
* is sleeping, no response to inter-processor interrupt
* although it's pending and interrupts are enabled.
* here is a workround
*/
#if !defined(CONFIG_SOC_NSIM) && !defined(CONFIG_SMP)
sleep r1
#else
seti r1
_z_arc_idle_loop:
b _z_arc_idle_loop
#endif
j_s [blink]
nop