bsp: qemu-virt64-riscv: remove config RISCV_S_MODE

RISCV_S_MODE configuration only affects the code in
libcpu/risc-v/virt64, and the only bsp using this
libcpu is qemu-virt64-riscv.

Considering s-mode is the default mode RT-Thread
running on virt64 machine, it seems unnecessary to
make RISCV_S_MODE a Kconfig option.

Solution: Remove RISCV_S_MODE from Kconfig and define
it as a macro in the code in libcpu/risc-v/virt64.

Plus, due to this macro is only related to virt64, rename
RISCV_S_MODE to RISCV_VIRT64_S_MODE.

Update the .config/rtconfig.h in this patch.

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>

bsp/qemu-virt64-riscv/.config

@@ -272,7 +272,6 @@ CONFIG_RT_DFS_ELM_MUTEX_TIMEOUT=3000
 
 CONFIG_RT_USING_DFS_DEVFS=y
 CONFIG_RT_USING_DFS_ROMFS=y
-# CONFIG_RT_USING_DFS_ROMFS_USER_ROOT is not set
 # CONFIG_RT_USING_DFS_CROMFS is not set
 # CONFIG_RT_USING_DFS_TMPFS is not set
 # CONFIG_RT_USING_DFS_MQUEUE is not set
@@ -1434,7 +1433,6 @@ CONFIG_RT_USING_ADT_REF=y
 #
 # RISC-V QEMU virt64 configs
 #
-CONFIG_RISCV_S_MODE=y
 CONFIG_BSP_USING_VIRTIO=y
 CONFIG_BSP_USING_VIRTIO_BLK=y
 CONFIG_BSP_USING_VIRTIO_NET=y

bsp/qemu-virt64-riscv/driver/Kconfig

@@ -1,9 +1,5 @@
 menu "RISC-V QEMU virt64 configs"
 
-config RISCV_S_MODE
-    bool "RT-Thread run in RISC-V S-Mode(supervisor mode)"
-    default y
-
 config BSP_USING_VIRTIO
     bool "Using VirtIO"
     default y

bsp/qemu-virt64-riscv/rtconfig.h

@@ -519,7 +519,6 @@
 
 /* RISC-V QEMU virt64 configs */
 
-#define RISCV_S_MODE
 #define BSP_USING_VIRTIO
 #define BSP_USING_VIRTIO_BLK
 #define BSP_USING_VIRTIO_NET

libcpu/risc-v/common64/README.md

@@ -33,7 +33,7 @@
 
 | 选项            |  默认值 | 说明                                                                                                 |
 | --------------- | --- | ---------------------------------------------------------------------------------------------------- |
-| RISCV_S_MODE    | 打开 | 系统启动后是否运行在S态，关闭时系统将运行在M态；目前系统存在bug尚不可直接运行在M态，故此开关必须打开 |
+| RISCV_VIRT64_S_MODE    | 打开 | 系统启动后是否运行在S态，关闭时系统将运行在M态；目前系统存在bug尚不可直接运行在M态，故此开关必须打开 |
 | RT_USING_SMART  | 关闭 | 是否开启RTThread SMART版本，开启后系统运行在S+U态，且会开启MMU页表(satp);关闭时系统仅运行在S态，MMU关闭(satp为bare translation)    |
 | ARCH_USING_ASID | 关闭 | MMU是否支持asid                                                                     |
 

libcpu/risc-v/virt64/plic.c

@@ -52,7 +52,7 @@ void plic_irq_enable(int irq)
 {
     int hart = __raw_hartid();
     *(uint32_t *)PLIC_ENABLE(hart) = ((*(uint32_t *)PLIC_ENABLE(hart)) | (1 << irq));
-#ifdef RISCV_S_MODE
+#ifdef RISCV_VIRT64_S_MODE
     set_csr(sie, read_csr(sie) | MIP_SEIP);
 #else
     set_csr(mie, read_csr(mie) | MIP_MEIP);

libcpu/risc-v/virt64/plic.h

@@ -30,7 +30,10 @@ extern size_t plic_base;
 #define PLIC_ENABLE_STRIDE              0x80
 #define PLIC_CONTEXT_STRIDE             0x1000
 
-#ifndef RISCV_S_MODE
+/* RT-Thread runs in S-mode on virt64 by default */
+#define RISCV_VIRT64_S_MODE
+
+#ifndef RISCV_VIRT64_S_MODE
 #define PLIC_MENABLE_OFFSET             (0x2000)
 #define PLIC_MTHRESHOLD_OFFSET          (0x200000)
 #define PLIC_MCLAIM_OFFSET              (0x200004)