[libcpu-riscv]: [surpport SMP]: Add dynamic startup based on core configuration.

Add dynamic startup based on core configuration.

It should be noted that to pass the SMP Utest, the maximum
priority needs to be configured to 256.

Signed-off-by: Mengchen Teng <teng_mengchen@163.com>

Author: Tm-C-mT

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)

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 :

bsp/qemu-virt64-riscv/link_cpus.lds

@@ -0,0 +1 @@
+RT_CPUS_NR = 8;

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

bsp/qemu-virt64-riscv/run.sh

@@ -24,7 +24,19 @@ if [ ! -f $path_image ]; then
 	exit
 fi
 
-qemu-system-riscv64 -nographic -machine virt -m 256M -kernel rtthread.bin -smp 2 \
+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 | 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=$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