From 32353337648eeb209e04adab0c8a644e91cd1cda Mon Sep 17 00:00:00 2001
From: Mohit Mishra <mohitmishra786687@gmail.com>
Date: Thu, 9 Jan 2025 00:34:32 +0530
Subject: [PATCH] Submission for Project:  IDL Writer / Verification

---
 submissions/mohit/pmp_check.py          |  95 ++++++++++++++++++
 submissions/mohit/pmp_configuration.txt | 128 ++++++++++++++++++++++++
 2 files changed, 223 insertions(+)
 create mode 100644 submissions/mohit/pmp_check.py
 create mode 100644 submissions/mohit/pmp_configuration.txt

diff --git a/submissions/mohit/pmp_check.py b/submissions/mohit/pmp_check.py
new file mode 100644
index 0000000..c0cdf03
--- /dev/null
+++ b/submissions/mohit/pmp_check.py
@@ -0,0 +1,95 @@
+import sys
+
+def main():
+    # Parse command-line arguments
+    if len(sys.argv) != 5:
+        print("Usage: python3 pmp_check.py pmp_configuration.txt 0xaddress M/W/S R/W/X")
+        sys.exit(1)
+
+    config_file = sys.argv[1]
+    address_str = sys.argv[2]
+    mode = sys.argv[3].upper()
+    operation = sys.argv[4].upper()
+
+    # Validate physical address
+    if not address_str.startswith("0x"):
+        print("Invalid address format. Must start with '0x'.")
+        sys.exit(1)
+    try:
+        address = int(address_str, 16)
+    except ValueError:
+        print("Invalid address format.")
+        sys.exit(1)
+
+    # Validate privilege mode and operation
+    if mode not in ['M', 'S', 'U']:
+        print("Invalid privilege mode. Must be one of 'M', 'S', or 'U'.")
+        sys.exit(1)
+    if operation not in ['R', 'W', 'X']:
+        print("Invalid operation. Must be one of 'R', 'W', or 'X'.")
+        sys.exit(1)
+
+    # Map privilege modes to levels
+    priv_level = {'M': 3, 'S': 1, 'U': 0}[mode]
+
+    try:
+        with open(config_file, 'r') as f:
+            lines = f.read().splitlines()
+            if len(lines) != 128:
+                print("Configuration file must have exactly 128 lines.")
+                sys.exit(1)
+            pmpcfg = [int(line, 16) for line in lines[:64]]
+            pmpaddr = [int(line, 16) for line in lines[64:]]
+    except Exception as e:
+        print(f"Error reading configuration file: {e}")
+        sys.exit(1)
+
+    # Define PMP region class
+    class PMPRegion:
+        def __init__(self, cfg, addr):
+            self.cfg = cfg
+            self.addr = addr
+            self.a = (cfg >> 5) & 0x3  # Address match type
+            self.r = (cfg >> 4) & 0x1  # Read permission
+            self.w = (cfg >> 3) & 0x1  # Write permission
+            self.x = (cfg >> 2) & 0x1  # Execute permission
+            self.priv = (cfg >> 0) & 0x3  # Privilege level (assuming bits 1-0)
+
+        def matches(self, addr):
+            if self.a == 0:  # OFF
+                return False
+            elif self.a == 1:  # TOR
+                return addr < self.addr
+            elif self.a == 2:  # NA4
+                return addr >= self.addr
+            elif self.a == 3:  # NAND
+                return (addr ^ self.addr) < self.addr
+            return False
+
+        def permits(self, op, priv):
+            # Check operation permission
+            if op == 'R' and not self.r:
+                return False
+            if op == 'W' and not self.w:
+                return False
+            if op == 'X' and not self.x:
+                return False
+            if priv >= self.priv:
+                return True
+            return False
+
+    regions = [PMPRegion(pmpcfg[i], pmpaddr[i]) for i in range(64)]
+
+    for region in regions:
+        if region.matches(address):
+            if region.permits(operation, priv_level):
+                print("Access allowed")
+                return
+            else:
+                print("Access fault")
+                return
+
+    print("Access fault")
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file
diff --git a/submissions/mohit/pmp_configuration.txt b/submissions/mohit/pmp_configuration.txt
new file mode 100644
index 0000000..244af7e
--- /dev/null
+++ b/submissions/mohit/pmp_configuration.txt
@@ -0,0 +1,128 @@
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+0xFFFFFFFF
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\ No newline at end of file