riscv : add riscv qemu virt support and fix fs bit error in mstatus

cmake/riscv64-unknown-elf.cmake

@@ -0,0 +1,29 @@
+# Toolchain settings
+set(CMAKE_C_COMPILER    riscv64-unknown-elf-gcc)
+set(CMAKE_CXX_COMPILER  riscv64-unknown-elf-g++)
+set(AS                  riscv64-unknown-elf-as)
+set(AR                  riscv64-unknown-elf-ar)
+set(OBJCOPY             riscv64-unknown-elf-objcopy)
+set(OBJDUMP             riscv64-unknown-elf-objdump)
+set(SIZE                riscv64-unknown-elf-size)
+
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+
+# this makes the test compiles use static library option so that we don't need to pre-set linker flags and scripts
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
+
+set(CMAKE_C_FLAGS   "${CFLAGS}" CACHE INTERNAL "c compiler flags")
+set(CMAKE_CXX_FLAGS "${CXXFLAGS}" CACHE INTERNAL "cxx compiler flags")
+set(CMAKE_ASM_FLAGS "${ASFLAGS} -D__ASSEMBLER__" CACHE INTERNAL "asm compiler flags")
+set(CMAKE_EXE_LINKER_FLAGS "${LDFLAGS}" CACHE INTERNAL "exe link flags")
+
+SET(CMAKE_C_FLAGS_DEBUG "-Og -g -ggdb3" CACHE INTERNAL "c debug compiler flags")
+SET(CMAKE_CXX_FLAGS_DEBUG "-Og -g -ggdb3" CACHE INTERNAL "cxx debug compiler flags")
+SET(CMAKE_ASM_FLAGS_DEBUG "-g -ggdb3" CACHE INTERNAL "asm debug compiler flags")
+
+SET(CMAKE_C_FLAGS_RELEASE "-O3" CACHE INTERNAL "c release compiler flags")
+SET(CMAKE_CXX_FLAGS_RELEASE "-O3" CACHE INTERNAL "cxx release compiler flags")
+SET(CMAKE_ASM_FLAGS_RELEASE "" CACHE INTERNAL "asm release compiler flags")

cmake/riscv64_gnu.cmake

@@ -0,0 +1,12 @@
+# Name of the target
+set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_SYSTEM_PROCESSOR risc-v64)
+
+set(THREADX_ARCH "risc-v64")
+set(THREADX_TOOLCHAIN "gnu")
+set(ARCH_FLAGS "-g -march=rv64gc -mabi=lp64d -mcmodel=medany")
+set(CFLAGS "${ARCH_FLAGS}")
+set(ASFLAGS "${ARCH_FLAGS}")
+set(LDFLAGS "${ARCH_FLAGS}")
+
+include(${CMAKE_CURRENT_LIST_DIR}/riscv64-unknown-elf.cmake)

ports/risc-v64/gnu/CMakeLists.txt

@@ -0,0 +1,19 @@
+
+target_sources(${PROJECT_NAME}
+    PRIVATE
+    # {{BEGIN_TARGET_SOURCES}}
+	${CMAKE_CURRENT_LIST_DIR}/src/tx_initialize_low_level.S
+	${CMAKE_CURRENT_LIST_DIR}/src/tx_thread_context_restore.S
+	${CMAKE_CURRENT_LIST_DIR}/src/tx_thread_context_save.S
+	${CMAKE_CURRENT_LIST_DIR}/src/tx_thread_interrupt_control.S
+	${CMAKE_CURRENT_LIST_DIR}/src/tx_thread_schedule.S
+	${CMAKE_CURRENT_LIST_DIR}/src/tx_thread_stack_build.S
+	${CMAKE_CURRENT_LIST_DIR}/src/tx_thread_system_return.S
+	${CMAKE_CURRENT_LIST_DIR}/src/tx_timer_interrupt.c
+    # {{END_TARGET_SOURCES}}
+)
+
+target_include_directories(${PROJECT_NAME}
+    PUBLIC
+    ${CMAKE_CURRENT_LIST_DIR}/inc
+)

ports/risc-v64/gnu/example_build/qemu_virt/board.c

@@ -0,0 +1,32 @@
+#include "plic.h"
+#include "hwtimer.h"
+#include "uart.h"
+#include <stdint.h>
+#include <stddef.h>
+
+void *memset(const void *des, int c,size_t n)
+{
+    if((des == NULL) || n <=0)
+            return (void*)des;
+    char* t = (char*)des;
+    int i;
+    for(i=0;i<n;i++)
+        t[i]=c;
+    return t; 
+}
+
+
+int board_init(void)
+{
+	int ret;
+	ret = plic_init();
+	if(ret)
+		return ret;
+	ret = uart_init();
+	if(ret)
+		return ret;
+	ret = hwtimer_init();
+	if(ret)
+		return ret;
+	return 0;
+}

ports/risc-v64/gnu/example_build/qemu_virt/build_libthreadx.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+pushd ../../../../../
+cmake -Bbuild -GNinja -DCMAKE_TOOLCHAIN_FILE=cmake/riscv64_gnu.cmake .
+cmake --build ./build/
+popd