From: Anup Patel <anup.patel@wdc.com>
Date: Fri, 5 Apr 2019 07:47:42 +0000 (+0530)
Subject: lib: Delegate supervisor ecall to HS-mode when H extension available
X-Git-Tag: v1.3~986
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0089897d41b5b2382acba1c2c9f9386edad75228;p=platform%2Fkernel%2Fopensbi-spacemit.git

lib: Delegate supervisor ecall to HS-mode when H extension available

When hypervisor extension is available, we only handle hypervisor
ecalls coming from HS-mode and we let hypervisor handle ecalls coming
from VS-mode.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
---

diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
index 018fe85..6dac84b 100644
--- a/lib/sbi/sbi_hart.c
+++ b/lib/sbi/sbi_hart.c
@@ -87,6 +87,14 @@ static int delegate_traps(struct sbi_scratch *scratch, u32 hartid)
 			      (1U << CAUSE_LOAD_PAGE_FAULT) |
 			      (1U << CAUSE_STORE_PAGE_FAULT);
 
+	/*
+	 * If hypervisor extension available then we only handle
+	 * hypervisor calls (i.e. ecalls from HS-mode) and we let
+	 * HS-mode handle supervisor calls (i.e. ecalls from VS-mode)
+	 */
+	if (misa_extension('H'))
+		exceptions |= (1U << CAUSE_SUPERVISOR_ECALL);
+
 	csr_write(CSR_MIDELEG, interrupts);
 	csr_write(CSR_MEDELEG, exceptions);