conf: add irqmax config for qemu.

qemu support 53 plic interrupt default,if device irq num is more than 53, qemu will crash.
qemu will parse config file to fixup irq crash issue.

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

conf/genconf.json

@@ -28,6 +28,7 @@
             "irq": "37"
         },
         "cpu_freq": "50000000",
-        "timer_freq": "32768"
+        "timer_freq": "32768",
+        "irqmax": "1023"
     }
 }

conf/genconf.py

@@ -198,6 +198,44 @@ def parse_size(size_str, output_format='numeric'):
     else:
         raise ValueError("Invalid output_format, must be 'numeric' or 'string'")
 
+def align_to_power_of_two(value):
+    if value == 0:
+        return 1
+    else:
+        return 1 << (value - 1).bit_length()
+
+def find_max_interrupts(dts_content):
+    interrupts_re = re.compile(r'interrupts\s*=\s*<(\d+)>;')
+    max_interrupts = 0
+    for match in interrupts_re.finditer(dts_content):
+        interrupts_value = int(match.group(1))
+        max_interrupts = max(max_interrupts, interrupts_value)
+    return max_interrupts
+
+def modify_plic_node(dts_content, aligned_value):
+    plic_node_re = re.compile(rf'riscv,ndev\s*=\s*<(\d+)>;', re.DOTALL)
+    modified_content = plic_node_re.sub(rf'riscv,ndev = <{aligned_value}>;', dts_content)
+    return modified_content
+
+def update_plic_intr_num(dts_file_path, irqmax=None):
+    with open(dts_file_path, 'r') as f:
+        dts_content = f.read()
+    max_interrupts = find_max_interrupts(dts_content)
+    if max_interrupts > 1024:
+        print("Error: irqmax in %s file is more than 1024." %(args.conf))
+        shutil.rmtree(cust_file)
+        sys.exit(1)
+    aligned_value = align_to_power_of_two(max_interrupts)
+    if irqmax is None:
+        aligned_value = min(aligned_value, 1024)
+    else:
+        aligned_value = min(int(irqmax), aligned_value, 1024)
+    modified_content = modify_plic_node(dts_content, aligned_value)
+
+    print("Update  plic riscv,ndev to %s" %aligned_value)
+    with open(dts_file_path, 'w') as f:
+        f.write(modified_content)
+
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(
         description="Generate configuration files based on a reference SOC."
@@ -256,6 +294,7 @@ def parse_size(size_str, output_format='numeric'):
     board_ampcore_num = None
     board_cpu_freq = None
     board_timer_freq = None
+    board_irqmax = None
 
     try:
         cust_file = args.custsoc
@@ -315,6 +354,8 @@ def parse_size(size_str, output_format='numeric'):
                 general_config['ampfw_size'] = "0x400000"
             if 'amp_core' not in general_config:
                 general_config['amp_core'] = "8"
+            if 'irqmax' in general_config:
+                board_irqmax = general_config['irqmax']
         else:
             print("Warning: json config file maybe empty! use basic default value.")
             ddr_config['base'] = "0x80000000"
@@ -464,6 +505,8 @@ def parse_size(size_str, output_format='numeric'):
                 qspi2_size_hex = hex(0x1000)
                 qspi2_reg_val = f"0x0 0x{qspi2_base_hex.lstrip('0x')} 0x0 0x{qspi2_size_hex.lstrip('0x')}"
                 update_dts_node(dts_file, 'qspi2', qspi2_base_hex.lstrip('0x'), qspi2_reg_val, board_qspi2_irq)
+            update_plic_intr_num(dts_file, board_irqmax)
+
         print("\n>>>Updating uboot.cmd...")
         # update uboot.cmd
         uboot_cmd_file = "%s/uboot.cmd" %(cust_file)