New patch to review for coreboot: RISCV: use a different prog_run for the payload.

[Ronald G. Minnich]

Ronald G. Minnich ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/11699

-gerrit

commit 18118044bc5281281e8135de977e9d7d1c6230de
Author: Ronald G. Minnich 
Date:   Tue Sep 22 15:53:32 2015 -0700

RISCV: use a different prog_run for the payload.

Unlike the other stages, the payload requires virtual memory to be set up
    and also a privelege level change.

Change-Id: Ibbe2a55f7719d917f121a53a17c6d90e6b2ab3d1
    Signed-off-by: Ronald G. Minnich 
---
 src/arch/riscv/Makefile.inc  |  2 +-
 src/arch/riscv/bootpayload.c | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/src/arch/riscv/Makefile.inc b/src/arch/riscv/Makefile.inc
index de6eb91..b7f2592 100644
--- a/src/arch/riscv/Makefile.inc
+++ b/src/arch/riscv/Makefile.inc
@@ -91,7 +91,7 @@ ramstage-y += virtual_memory.c
 ramstage-y += rom_media.c
 ramstage-y += stages.c
 ramstage-y += misc.c
-ramstage-y += boot.c
+ramstage-y += bootpayload.c
 ramstage-y += tables.c
 ramstage-y += \
    $(top)/src/lib/memchr.c \
diff --git a/src/arch/riscv/bootpayload.c b/src/arch/riscv/bootpayload.c
new file mode 100644
index 0000000..a6e9767
--- /dev/null
+++ b/src/arch/riscv/bootpayload.c
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+
+#include <program_loading.h>
+#include <vm.h>
+#include <arch/encoding.h>
+
+void arch_prog_run(struct prog *prog)
+{
+	initVirtualMemory();
+	write_csr(mepc, prog_entry(prog));
+    	asm volatile("eret");
+}