diff --git a/src/acpi/rsdp.rs b/src/acpi/rsdp.rs
index f10c5ac9..f3cf3175 100644
--- a/src/acpi/rsdp.rs
+++ b/src/acpi/rsdp.rs
@@ -17,9 +17,33 @@ pub struct Rsdp {
 
 impl Rsdp {
     pub unsafe fn get_rsdp(already_supplied_rsdp: Option<*const u8>) -> Option<Rsdp> {
-        already_supplied_rsdp.map(|rsdp_ptr| {
-            // TODO: Validate
-            unsafe { *(rsdp_ptr as *const Rsdp) }
+        already_supplied_rsdp.and_then(|rsdp_ptr| {
+            let rsdp = unsafe { *(rsdp_ptr as *const Rsdp) };
+
+            // Validate signature "RSD PTR "
+            if &rsdp.signature != b"RSD PTR " {
+                return None;
+            }
+
+            // ACPI 1.0 checksum: sum of first 20 bytes must be zero
+            let bytes_v1 = unsafe { core::slice::from_raw_parts(rsdp_ptr, 20) };
+            if bytes_v1.iter().fold(0u8, |sum, &b| sum.wrapping_add(b)) != 0 {
+                return None;
+            }
+
+            // ACPI 2.0+ extended checksum: sum of entire table (length bytes) must be zero
+            if rsdp.revision >= 2 {
+                let full_len = rsdp._length as usize;
+                if full_len < 36 || full_len > 256 {
+                    return None;
+                }
+                let bytes_full = unsafe { core::slice::from_raw_parts(rsdp_ptr, full_len) };
+                if bytes_full.iter().fold(0u8, |sum, &b| sum.wrapping_add(b)) != 0 {
+                    return None;
+                }
+            }
+
+            Some(rsdp)
         })
     }