From 7d60c5904f45d979643c1b9f6cdde42f62ef3c32 Mon Sep 17 00:00:00 2001
From: Andrew Waterman <andrew@sifive.com>
Date: Tue, 21 Mar 2017 16:56:52 -0700
Subject: Allow PK access to user memory

---
 machine/encoding.h | 15 +++++++++++++--
 pk/pk.c            |  1 +
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/machine/encoding.h b/machine/encoding.h
index 1b9883e..4f0d0a4 100644
--- a/machine/encoding.h
+++ b/machine/encoding.h
@@ -17,7 +17,7 @@
 #define MSTATUS_FS          0x00006000
 #define MSTATUS_XS          0x00018000
 #define MSTATUS_MPRV        0x00020000
-#define MSTATUS_PUM         0x00040000
+#define MSTATUS_SUM         0x00040000
 #define MSTATUS_MXR         0x00080000
 #define MSTATUS_TVM         0x00100000
 #define MSTATUS_TW          0x00200000
@@ -32,7 +32,8 @@
 #define SSTATUS_SPP         0x00000100
 #define SSTATUS_FS          0x00006000
 #define SSTATUS_XS          0x00018000
-#define SSTATUS_PUM         0x00040000
+#define SSTATUS_SUM         0x00040000
+#define SSTATUS_MXR         0x00080000
 #define SSTATUS32_SD        0x80000000
 #define SSTATUS64_SD        0x8000000000000000
 
@@ -123,6 +124,16 @@
 #define SPTBR_MODE_SV57 10
 #define SPTBR_MODE_SV64 11
 
+#define PMP_R     0x01
+#define PMP_W     0x02
+#define PMP_X     0x04
+#define PMP_M     0x08
+#define PMP_NAPOT 0x10
+#define PMP_TOR   0x20
+#define PMP_EN    0x40
+#define PMP_LOCK  0x80
+#define PMP_SHIFT 2
+
 #define IRQ_S_SOFT   1
 #define IRQ_H_SOFT   2
 #define IRQ_M_SOFT   3
diff --git a/pk/pk.c b/pk/pk.c
index 8132f8d..c0b6407 100644
--- a/pk/pk.c
+++ b/pk/pk.c
@@ -160,6 +160,7 @@ void boot_loader()
   write_csr(stvec, &trap_entry);
   write_csr(sscratch, 0);
   write_csr(sie, 0);
+  set_csr(sstatus, SSTATUS_SUM);
 
   file_init();
   enter_supervisor_mode(rest_of_boot_loader, pk_vm_init(), 0);
-- 
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