RT-Thread · Tm-C-mT · Oct 28, 2025 · Oct 28, 2025 · Oct 28, 2025 · Oct 28, 2025
diff --git a/bsp/qemu-virt64-riscv/SConstruct b/bsp/qemu-virt64-riscv/SConstruct
@@ -38,5 +38,25 @@ if GetDepend('__STACKSIZE__'): stack_size = GetDepend('__STACKSIZE__')
 stack_lds.write('__STACKSIZE__ = %d;\n' % stack_size)
 stack_lds.close()
 
+# Obtain the number of harts from rtconfig.h and write 
+# it into link_cpus.lds for the linker script
+try:
+    with open('rtconfig.h', 'r') as f:
+        rtconfig_content = f.readlines()
+except FileNotFoundError:
+    cpus_nr = 1
+else:
+    cpus_nr = 1  # default value
+    for line in rtconfig_content:
+        line = line.strip()
+        if line.startswith('#define') and 'RT_CPUS_NR' in line:
+            parts = line.split()
+            if len(parts) >= 3 and parts[2].isdigit():
+                cpus_nr = int(parts[2])
+                break 
+
+with open('link_cpus.lds', 'w') as cpus_lds:
+    cpus_lds.write(f'RT_CPUS_NR = {cpus_nr};\n')
+
 # make a building
 DoBuilding(TARGET, objs)
diff --git a/bsp/qemu-virt64-riscv/driver/board.c b/bsp/qemu-virt64-riscv/driver/board.c
@@ -24,6 +24,10 @@
 #include "plic.h"
 #include "stack.h"
 
+#ifdef RT_USING_SMP
+#include "interrupt.h"
+#endif /* RT_USING_SMP */
+
 #ifdef RT_USING_SMART
 #include "riscv_mmu.h"
 #include "mmu.h"
@@ -89,6 +93,11 @@ void rt_hw_board_init(void)
 
     rt_hw_tick_init();
 
+#ifdef RT_USING_SMP
+    /* ipi init */
+    rt_hw_ipi_init();
+#endif /* RT_USING_SMP */
+
 #ifdef RT_USING_COMPONENTS_INIT
     rt_components_board_init();
 #endif

diff --git a/bsp/qemu-virt64-riscv/driver/board.h b/bsp/qemu-virt64-riscv/driver/board.h
@@ -25,7 +25,7 @@ extern unsigned int __bss_end;
 #define RT_HW_HEAP_BEGIN ((void *)&__bss_end)
 #define RT_HW_HEAP_END   ((void *)(RT_HW_HEAP_BEGIN + 64 * 1024 * 1024))
 #define RT_HW_PAGE_START RT_HW_HEAP_END
-#define RT_HW_PAGE_END   ((void *)(KERNEL_VADDR_START + (256 * 1024 * 1024 - VIRT64_SBI_MEMSZ)))
+#define RT_HW_PAGE_END   ((void *)(KERNEL_VADDR_START + (128 * 1024 * 1024 - VIRT64_SBI_MEMSZ)))
 
 void rt_hw_board_init(void);
 void rt_init_user_mem(struct rt_thread *thread, const char *name,

diff --git a/bsp/qemu-virt64-riscv/link.lds b/bsp/qemu-virt64-riscv/link.lds
@@ -9,6 +9,7 @@
  */
 
 INCLUDE "link_stacksize.lds"
+INCLUDE "link_cpus.lds"
 
 OUTPUT_ARCH( "riscv" )
 
@@ -121,12 +122,9 @@ SECTIONS
     {
         . = ALIGN(64);
         __stack_start__ = .;
-
-        . += __STACKSIZE__;
-        __stack_cpu0 = .;
-
-        . += __STACKSIZE__;
-        __stack_cpu1 = .;
+        /* Dynamically allocate stack areas according to RT_CPUS_NR */
+        . += (__STACKSIZE__ * RT_CPUS_NR);
+        __stack_end__ = .;
     } > SRAM
 
     .sbss :
@@ -138,6 +136,24 @@ SECTIONS
         *(.scommon)
     } > SRAM
 
+    .percpu (NOLOAD) :
+    {
+        /* 2MB Align for MMU early map */
+        . = ALIGN(0x200000);
+        PROVIDE(__percpu_start = .);
+
+        *(.percpu)
+
+        /* 2MB Align for MMU early map */
+        . = ALIGN(0x200000);
+
+        PROVIDE(__percpu_end = .);
+
+        /* Clone the area */
+        . = __percpu_end + (__percpu_end - __percpu_start) * (RT_CPUS_NR - 1);
+        PROVIDE(__percpu_real_end = .);
+    } > SRAM
+
     .bss :
     {
         *(.bss)

diff --git a/bsp/qemu-virt64-riscv/link_cpus.lds b/bsp/qemu-virt64-riscv/link_cpus.lds
@@ -0,0 +1 @@
+RT_CPUS_NR = 8;
diff --git a/bsp/qemu-virt64-riscv/link_smart.lds b/bsp/qemu-virt64-riscv/link_smart.lds
@@ -9,6 +9,7 @@
  */
 
 INCLUDE "link_stacksize.lds"
+INCLUDE "link_cpus.lds"
 
 OUTPUT_ARCH( "riscv" )
 
@@ -122,12 +123,9 @@ SECTIONS
     {
         . = ALIGN(64);
         __stack_start__ = .;
-
-        . += __STACKSIZE__;
-        __stack_cpu0 = .;
-
-        . += __STACKSIZE__;
-        __stack_cpu1 = .;
+        /* Dynamically allocate stack areas according to RT_CPUS_NR */
+        . += (__STACKSIZE__ * RT_CPUS_NR);
+        __stack_end__ = .;
     } > SRAM
 
     .sbss :
@@ -139,6 +137,24 @@ SECTIONS
         *(.scommon)
     } > SRAM
 
+    .percpu (NOLOAD) :
+    {
+        /* 2MB Align for MMU early map */
+        . = ALIGN(0x200000);
+        PROVIDE(__percpu_start = .);
+
+        *(.percpu)
+
+        /* 2MB Align for MMU early map */
+        . = ALIGN(0x200000);
+
+        PROVIDE(__percpu_end = .);
+
+        /* Clone the area */
+        . = __percpu_end + (__percpu_end - __percpu_start) * (RT_CPUS_NR - 1);
+        PROVIDE(__percpu_real_end = .);
+    } > SRAM
+
     .bss :
     {
         *(.bss)

diff --git a/bsp/qemu-virt64-riscv/qemu-dbg.sh b/bsp/qemu-virt64-riscv/qemu-dbg.sh
@@ -1,4 +1,16 @@
-qemu-system-riscv64 -nographic -machine virt -m 256M -kernel rtthread.bin -s -S \
+QEMU_CMD="qemu-system-riscv64 -nographic -machine virt -m 256M -kernel rtthread.bin -s -S"
+
+if grep -q "#define RT_USING_SMP" ./rtconfig.h 2>/dev/null; then
+    hart_num=$(grep "RT_CPUS_NR = [0-9]*;" ./link_cpus.lds | awk -F'[=;]' '{gsub(/ /, "", $2); print $2}')
+    if [ -z "$hart_num" ]; then
+        hart_num=1
+    fi
+    QEMU_CMD="$QEMU_CMD -smp $hart_num"
+fi
+
+QEMU_CMD="$QEMU_CMD \
 -drive if=none,file=sd.bin,format=raw,id=blk0 -device virtio-blk-device,drive=blk0,bus=virtio-mmio-bus.0 \
 -netdev user,id=tap0 -device virtio-net-device,netdev=tap0,bus=virtio-mmio-bus.1 \
--device virtio-serial-device -chardev socket,host=127.0.0.1,port=4321,server=on,wait=off,telnet=on,id=console0 -device virtserialport,chardev=console0
+-device virtio-serial-device -chardev socket,host=127.0.0.1,port=4321,server=on,wait=off,telnet=on,id=console0 -device virtserialport,chardev=console0"
+
+eval $QEMU_CMD
diff --git a/bsp/qemu-virt64-riscv/run.sh b/bsp/qemu-virt64-riscv/run.sh
@@ -24,7 +24,20 @@ if [ ! -f $path_image ]; then
 	exit
 fi
 
-qemu-system-riscv64 -nographic -machine virt -m 256M -kernel rtthread.bin \
+QEMU_CMD="qemu-system-riscv64 -nographic -machine virt -m 256M -kernel rtthread.bin"
+
+if grep -q "#define RT_USING_SMP" ./rtconfig.h 2>/dev/null; then
+    hart_num=$(grep "RT_CPUS_NR = [0-9]*;" ./link_cpus.lds 2>/dev/null | awk -F'[=;]' '{gsub(/ /, "", $2); print $2}')
+    if [ -z "$hart_num" ] || [ "$hart_num" -lt 1 ]; then
+        echo "Warning: Invalid or missing RT_CPUS_NR, defaulting to 1"
+        hart_num=1
+    fi
+    QEMU_CMD="$QEMU_CMD -smp $hart_num"
+fi
+
+QEMU_CMD="$QEMU_CMD \
 -drive if=none,file=$path_image,format=raw,id=blk0 -device virtio-blk-device,drive=blk0,bus=virtio-mmio-bus.0 \
 -netdev user,id=tap0 -device virtio-net-device,netdev=tap0,bus=virtio-mmio-bus.1 \
--device virtio-serial-device -chardev socket,host=127.0.0.1,port=4321,server=on,wait=off,telnet=on,id=console0 -device virtserialport,chardev=console0
+-device virtio-serial-device -chardev socket,host=127.0.0.1,port=4321,server=on,wait=off,telnet=on,id=console0 -device virtserialport,chardev=console0"
+
+eval $QEMU_CMD
diff --git a/libcpu/risc-v/common64/SConscript b/libcpu/risc-v/common64/SConscript
@@ -7,6 +7,8 @@ CPPPATH = [cwd]
 if not GetDepend('ARCH_USING_ASID'):
     SrcRemove(src, ['asid.c'])
 
+src.append('../common/atomic_riscv.c')
+
 group = DefineGroup('CPU', src, depend = [''], CPPPATH = CPPPATH)
 
 Return('group')
diff --git a/libcpu/risc-v/common64/context_gcc.S b/libcpu/risc-v/common64/context_gcc.S
@@ -69,29 +69,47 @@
 .endm
 
 /*
+ * #ifdef RT_USING_SMP
+ * void rt_hw_context_switch_to(rt_ubase_t to, stuct rt_thread *to_thread);
+ * #else
  * void rt_hw_context_switch_to(rt_ubase_t to);
- *
- * a0 --> to SP pointer
+ * #endif
+ * a0 --> to
+ * a1 --> to_thread
  */
 .globl rt_hw_context_switch_to
 rt_hw_context_switch_to:
     LOAD sp, (a0)
 
+#ifdef RT_USING_SMP
+    /* Pass the previous CPU lock status to rt_cpus_lock_status_restore for restoration */
+    mv   a0,   a1
+    call  rt_cpus_lock_status_restore
+#endif
+
     call rt_thread_self
     mv s1, a0
 
+#ifndef RT_USING_SMP
+    //if enable RT_USING_SMP, it will finished by rt_cpus_lock_status_restore.
     #ifdef RT_USING_SMART
-        call lwp_aspace_switch
+      call lwp_aspace_switch
     #endif
+#endif
 
     RESTORE_CONTEXT
     sret
 
 /*
+ * #ifdef RT_USING_SMP
+ * void rt_hw_context_switch(rt_ubase_t from, rt_ubase_t to, struct rt_thread *to_thread);
+ * #else
  * void rt_hw_context_switch(rt_ubase_t from, rt_ubase_t to);
+ * #endif
  *
  * a0 --> from SP pointer
  * a1 --> to SP pointer
+ * a2 --> to_thread
  *
  * It should only be used on local interrupt disable
  */
@@ -103,13 +121,22 @@ rt_hw_context_switch:
     // restore to thread SP
     LOAD sp, (a1)
 
+#ifdef RT_USING_SMP
+    /* Pass the previous CPU lock status to rt_cpus_lock_status_restore for restoration */
+    mv   a0,   a2
+    call  rt_cpus_lock_status_restore
+#endif /*RT_USING_SMP*/
+
     // restore Address Space
     call rt_thread_self
     mv s1, a0
 
+#ifndef RT_USING_SMP
+    // if enable RT_USING_SMP, it will finished by rt_cpus_lock_status_restore.
     #ifdef RT_USING_SMART
-        call lwp_aspace_switch
+       call lwp_aspace_switch
     #endif
+#endif
 
     RESTORE_CONTEXT
     sret
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		RT_CPUS_NR = 8;
Copy link Copilot AI Nov 17, 2025 Choose a reason for hiding this comment The reason will be displayed to describe this comment to others. Learn more. [nitpick] [Best Practices/最佳实践]: Hardcoded maximum CPUs value in linker script. English: The value `RT_CPUS_NR = 8` is hardcoded in the linker script but may not match the actual `RT_CPUS_NR` configured in rtconfig.h. While the SConstruct script generates this file, having a default of 8 could be misleading. 中文：值 `RT_CPUS_NR = 8` 在链接器脚本中硬编码，但可能与 rtconfig.h 中配置的实际 `RT_CPUS_NR` 不匹配。虽然 SConstruct 脚本生成此文件，但默认值为 8 可能会产生误导。 Suggestion/建议: Add a comment explaining that this file is auto-generated: /* Auto-generated by SConstruct - do not edit manually */ RT_CPUS_NR = 8; Or add this to a .gitignore to avoid committing the generated file. Copilot uses AI. Check for mistakes.