[coreboot-gerrit] New patch to review for coreboot: arch/riscv: Delegate exceptions to supervisor mode if appropriate

[Jonathan Neuschäfer (j.neuschaefer@gmx.net)]

Jonathan Neuschäfer (j.neuschaefer at gmx.net) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/16160

-gerrit

commit 12778510949222752f83386a9cb685a781ba3b16
Author: Jonathan Neuschäfer <j.neuschaefer at gmx.net>
Date:   Thu Aug 11 22:49:14 2016 +0200

    arch/riscv: Delegate exceptions to supervisor mode if appropriate
    
    Change-Id: I1c8127412af0f9acc5b5520dc324ac145e59a4bd
    Signed-off-by: Jonathan Neuschäfer <j.neuschaefer at gmx.net>
---
 src/arch/riscv/virtual_memory.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/arch/riscv/virtual_memory.c b/src/arch/riscv/virtual_memory.c
index bbbba7a..caffffb 100644
--- a/src/arch/riscv/virtual_memory.c
+++ b/src/arch/riscv/virtual_memory.c
@@ -139,4 +139,14 @@ void mstatus_init(void)
 
 	clear_csr(mip, MIP_MSIP);
 	set_csr(mie, MIP_MSIP);
+
+	/* Configure which exception causes are delegated to supervisor mode */
+	set_csr(medeleg,  (1 << CAUSE_MISALIGNED_FETCH)
+			| (1 << CAUSE_FAULT_FETCH)
+			| (1 << CAUSE_ILLEGAL_INSTRUCTION)
+			| (1 << CAUSE_BREAKPOINT)
+			| (1 << CAUSE_FAULT_LOAD)
+			| (1 << CAUSE_FAULT_STORE)
+			| (1 << CAUSE_USER_ECALL)
+	);
 }