Merge https://source.denx.de/u-boot/custodians/u-boot-riscv

- Kautuk's semihosting patch:
  move semihosting library from arm directory to common place and add
  RISC-V support
- Zong's Kconfig patch:
  use "imply" instead of "select" to allow user to decide if
  SPL_SEPARATE_BSS should be selected

1 files changed, 24 insertions, 0 deletions

diff --git a/arch/riscv/lib/semihosting.c b/arch/riscv/lib/semihosting.c
new file mode 100644
index 00000000000..d6593b02a6f
--- /dev/null
+++ b/arch/riscv/lib/semihosting.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2022 Ventana Micro Systems Inc.
+ */
+
+#include <common.h>
+
+long smh_trap(int sysnum, void *addr)
+{
+	register int ret asm ("a0") = sysnum;
+	register void *param0 asm ("a1") = addr;
+
+	asm volatile (".align 4\n"
+		".option push\n"
+		".option norvc\n"
+
+		"slli zero, zero, 0x1f\n"
+		"ebreak\n"
+		"srai zero, zero, 7\n"
+		".option pop\n"
+		: "+r" (ret) : "r" (param0) : "memory");
+
+	return ret;
+}