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

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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>
This commit is contained in:
Anup Patel 2019-04-05 13:17:42 +05:30 • committed by Anup Patel
parent 1ed9eb255d
commit 0089897d41
1 changed files with 8 additions and 0 deletions
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8
lib/sbi/sbi_hart.c
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@ -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);