[libcpu] rv64: support for ARCH_REMAP_KERNEL (#9067)

* [libcpu] support for ARCH_REMAP_KERNEL

These changes introduce support for the ARCH_REMAP_KERNEL configuration,
which isolates kernel space in high virtual address regions. This feature
is necessary to enhance memory protection and management by segregating
user and kernel spaces more effectively.

Changes:
- Updated conditional macros to check for ARCH_REMAP_KERNEL instead of
  ARCH_KERNEL_IN_HIGH_VA in board initialization files to reflect the new
  configuration option.
- Modified qemu-virt64-riscv Kconfig and SConstruct files to include and
  utilize ARCH_REMAP_KERNEL.
- Created a new linker script `link_smart.lds` for smart linking in qemu-virt64-riscv.
- Updated rtconfig.py to use a more flexible execution path setup.
- Enhanced user address space definitions in `lwp_arch.h` to support the
  new virtual address mappings.
- Adjusted kernel memory initialization and mapping logic in `c906/mmu.c`
  and `virt64/mmu.c` to account for high virtual address regions.
- Added Kconfig option to enable ARCH_REMAP_KERNEL for RISCV64 architectures.
- Enhanced memory setup functions to support new mapping scheme, including
  updates to early page table setup and address relocation logic.

These modifications ensure that the system can utilize high memory
addresses for the kernel, improving memory isolation and system stability.

Signed-off-by: Shell <[email protected]>

* fixup: CI run failed

* bsp: default config without using smart

* fixup: static checks

* restore rt_hw_mmu_kernel_map_init for D1

---------

Signed-off-by: Shell <[email protected]>

Author: polarvid

.github/workflows/action_utest.yml

@@ -142,9 +142,9 @@ jobs:
         popd
         pushd UtestRunner
         if [ $TEST_SD_FILE != "None" ]; then
-          python3 qemu_runner.py --system $TEST_QEMU_ARCH --machine $TEST_QEMU_MACHINE --elf ../$TEST_BSP_ROOT/rtthread.elf --sd ../$TEST_BSP_ROOT/$TEST_SD_FILE
+          python3 qemu_runner.py --system $TEST_QEMU_ARCH --machine $TEST_QEMU_MACHINE --elf ../$TEST_BSP_ROOT/rtthread.bin --sd ../$TEST_BSP_ROOT/$TEST_SD_FILE
         else
-          python3 qemu_runner.py --system $TEST_QEMU_ARCH --machine $TEST_QEMU_MACHINE --elf ../$TEST_BSP_ROOT/rtthread.elf
+          python3 qemu_runner.py --system $TEST_QEMU_ARCH --machine $TEST_QEMU_MACHINE --elf ../$TEST_BSP_ROOT/rtthread.bin
         fi
         cat rtt_console.log
         popd

bsp/bouffalo_lab/bl808/d0/board/board.c

@@ -38,7 +38,7 @@ void init_bss(void)
     unsigned int *dst;
 
     dst = &__bss_start;
-    while (dst < &__bss_end)
+    while ((rt_ubase_t)dst < (rt_ubase_t)&__bss_end)
     {
         *dst++ = 0;
     }
@@ -62,7 +62,7 @@ void primary_cpu_entry(void)
 
 #define IOREMAP_SIZE (1ul << 30)
 
-#ifndef ARCH_KERNEL_IN_HIGH_VA
+#ifndef ARCH_REMAP_KERNEL
 #define IOREMAP_VEND USER_VADDR_START
 #else
 #define IOREMAP_VEND 0ul

bsp/cvitek/cv18xx_risc-v/board/board.c

@@ -38,7 +38,7 @@ void init_bss(void)
     unsigned int *dst;
 
     dst = &__bss_start;
-    while (dst < &__bss_end)
+    while ((rt_ubase_t)dst < (rt_ubase_t)&__bss_end)
     {
         *dst++ = 0;
     }
@@ -62,7 +62,7 @@ void primary_cpu_entry(void)
 
 #define IOREMAP_SIZE (1ul << 30)
 
-#ifndef ARCH_KERNEL_IN_HIGH_VA
+#ifndef ARCH_REMAP_KERNEL
 #define IOREMAP_VEND USER_VADDR_START
 #else
 #define IOREMAP_VEND 0ul