Commit b47613da authored Sep 06, 2019 by Xiang Wang Committed by Paul Walmsley Sep 20, 2019

arch/riscv: disable excess harts before picking main boot hart



Harts with id greater than or equal to CONFIG_NR_CPUS need to be
disabled.  But the kernel can pick any hart as the main hart.  So,
before picking the main hart, the kernel must disable harts with ids
greater than or equal to CONFIG_NR_CPUS.

Signed-off-by: Xiang Wang <merle@hardenedlinux.org>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
[paul.walmsley@sifive.com: updated to apply; cleaned up patch
 description]
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>

parent 1cec0ce2

arch/riscv/kernel/head.S

+5 −3

Original line number	Diff line number	Diff line
		@@ -63,6 +63,11 @@ _start_kernel:
		li t0, SR_FS
		csrc CSR_SSTATUS, t0

		#ifdef CONFIG_SMP
		li t0, CONFIG_NR_CPUS
		bgeu a0, t0, .Lsecondary_park
		#endif

		/* Pick one hart to run the main boot sequence */
		la a3, hart_lottery
		li a2, 1
		@@ -154,9 +159,6 @@ relocate:

		.Lsecondary_start:
		#ifdef CONFIG_SMP
		li a1, CONFIG_NR_CPUS
		bgeu a0, a1, .Lsecondary_park

		/* Set trap vector to spin forever to help debug */
		la a3, .Lsecondary_park
		csrw CSR_STVEC, a3