diff options
| author | Mitchell Horne <mhorne@FreeBSD.org> | 2020-05-01 21:59:47 +0000 |
|---|---|---|
| committer | Mitchell Horne <mhorne@FreeBSD.org> | 2020-05-01 21:59:47 +0000 |
| commit | 4d7e9134bb1f9745229a350b5a3014af64650012 (patch) | |
| tree | 9eaecd46683ae3b10b9e2a7212b0e0720e14cfdf | |
| parent | c74959537c4d1d8679dc75ab9a50f97473d0a92b (diff) | |
Use the HSM SBI extension to halt CPUs
Differential Revision: https://reviews.freebsd.org/D24498
Notes
Notes:
svn path=/head/; revision=360554
| -rw-r--r-- | sys/riscv/riscv/machdep.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/riscv/riscv/machdep.c b/sys/riscv/riscv/machdep.c index 109337230db3..9dacd4b9d3a1 100644 --- a/sys/riscv/riscv/machdep.c +++ b/sys/riscv/riscv/machdep.c @@ -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 */ } /* |