riscv: add support for supervisor binary interface (SBI)

SBI is runtime service for OS. For an introduction, please refer to
https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.md

Change-Id: Ib6c1f21d2f085f02208305dc4e3a0f970d400c27
Signed-off-by: Xiang Wang <wxjstz@126.com>
Reviewed-on: https://review.coreboot.org/28096
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

2 files changed, 45 insertions, 0 deletions

diff --git a/src/arch/riscv/include/sbi.h b/src/arch/riscv/include/sbi.h
new file mode 100644
index 0000000000..e9301f630c
--- /dev/null
+++ b/src/arch/riscv/include/sbi.h
@@ -0,0 +1,37 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 HardenedLinux
+ *
+ * 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.
+ */
+
+#ifndef RISCV_SBI_H
+#define RISCV_SBI_H
+
+#define SBI_SET_TIMER              0
+#define SBI_CONSOLE_PUTCHAR        1
+#define SBI_CONSOLE_GETCHAR        2
+#define SBI_CLEAR_IPI              3
+#define SBI_SEND_IPI               4
+#define SBI_REMOTE_FENCE_I         5
+#define SBI_REMOTE_SFENCE_VMA      6
+#define SBI_REMOTE_SFENCE_VMA_ASID 7
+#define SBI_SHUTDOWN               8
+
+#define IPI_SOFT            1
+#define IPI_FENCE_I         2
+#define IPI_SFENCE_VMA      4
+#define IPI_SFENCE_VMA_ASID 8
+#define IPI_SHUTDOWN        16
+
+void handle_sbi(trapframe *tf);
+
+#endif /* RISCV_SBI_H */
diff --git a/src/arch/riscv/include/vm.h b/src/arch/riscv/include/vm.h
index 749c9c86bf..9f6236ea75 100644
--- a/src/arch/riscv/include/vm.h
+++ b/src/arch/riscv/include/vm.h
@@ -102,6 +102,14 @@ DEFINE_MPRV_WRITE(mprv_write_u64, uint64_t, sd)
 DEFINE_MPRV_WRITE(mprv_write_long, long, sd)
 DEFINE_MPRV_WRITE(mprv_write_ulong, unsigned long, sd)
 
+#if __riscv_xlen == 32
+	DEFINE_MPRV_READ(mprv_read_uintptr_t, uintptr_t, lw)
+	DEFINE_MPRV_READ(mprv_write_uintptr_t, uintptr_t, sw)
+#elif __riscv_xlen == 64
+	DEFINE_MPRV_READ(mprv_read_uintptr_t, uintptr_t, ld)
+	DEFINE_MPRV_READ(mprv_write_uintptr_t, uintptr_t, sd)
+#endif
+
 #undef DEFINE_MPRV_READ_FLAGS
 #undef DEFINE_MPRV_READ
 #undef DEFINE_MPRV_READ_MXR