1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/start.c b/kernel/start.c
index 1876680..938e837 100644
--- a/kernel/start.c
+++ b/kernel/start.c
@@ -38,6 +38,11 @@ start()
   w_mideleg(0xffff);
   w_sie(r_sie() | SIE_SEIE | SIE_STIE | SIE_SSIE);
 
+  // configure Physical Memory Protection to give supervisor mode
+  // access to all of physical memory.
+  w_pmpaddr0(0x3fffffffffffffull);
+  w_pmpcfg0(0xf);
+
   // ask for clock interrupts.
   timerinit();