Use the HSM SBI extension to halt CPUs

Differential Revision:	https://reviews.freebsd.org/D24498

This commit is contained in:

Mitchell Horne

2020-05-01 21:59:47 +00:00

parent c74959537c

commit 4d7e9134bb

1 changed files with 7 additions and 0 deletions

									
										sys/riscv/riscv/machdep.c
									
		+7
		
												View File
												
					@@ -473,9 +473,16 @@ void

					cpu_halt(void)

					cpu_halt(void)

					{

					{

						/*

						 * Try to power down using the HSM SBI extension and fall back to a

						 * simple wfi loop.

						 */

						intr_disable();

						intr_disable();

						if (sbi_probe_extension(SBI_EXT_ID_HSM) != 0)

							sbi_hsm_hart_stop();

						for (;;)

						for (;;)

							__asm __volatile("wfi");

							__asm __volatile("wfi");

						/* NOTREACHED */

					}

					}

					/*

					/*