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Use the HSM SBI extension to halt CPUs
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Differential Revision:	https://reviews.freebsd.org/D24498
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@mhorne
mhorne committed May 1, 2020
1 parent c749595 commit 4d7e913
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7 changes: 7 additions & 0 deletions sys/riscv/riscv/machdep.c
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Original file line number Diff line number Diff line change
Expand Up @@ -473,9 +473,16 @@ void
cpu_halt(void)
{

/*
* Try to power down using the HSM SBI extension and fall back to a
* simple wfi loop.
*/
intr_disable();
if (sbi_probe_extension(SBI_EXT_ID_HSM) != 0)
sbi_hsm_hart_stop();
for (;;)
__asm __volatile("wfi");
/* NOTREACHED */
}

/*
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