diff --git a/kernel/src/drivers/bus/pci.rs b/kernel/src/drivers/bus/pci.rs
index 766f27b..8761d34 100644
--- a/kernel/src/drivers/bus/pci.rs
+++ b/kernel/src/drivers/bus/pci.rs
@@ -251,3 +251,27 @@ pub fn init() {
         }
     }
 }
+
+pub fn find_device(vendor: u32, product: u32) -> Option<PciTag> {
+    for bus in 0..256 {
+        for dev in 0..32 {
+            let tag = PciTag::new(bus, dev, 0);
+            if let Some((vid, did, next)) = tag.probe() {
+                if vid == vendor && did == product {
+                    return Some(tag);
+                }
+                if next {
+                    for func in 1..8 {
+                        let tag = PciTag::new(bus, dev, func);
+                        if let Some((vid, did, _)) = tag.probe() {
+                            if vid == vendor && did == product {
+                                return Some(tag);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    None
+}
\ No newline at end of file
diff --git a/kernel/src/syscall/custom.rs b/kernel/src/syscall/custom.rs
new file mode 100644
index 0000000..bf10b22
--- /dev/null
+++ b/kernel/src/syscall/custom.rs
@@ -0,0 +1,32 @@
+//! Custom nonstandard syscalls
+use rcore_memory::memory_set::handler::Linear;
+use rcore_memory::memory_set::MemoryAttr;
+use super::*;
+use crate::drivers::bus::pci;
+
+pub fn sys_map_pci_device(vendor: usize, product: usize) -> SysResult {
+    info!(
+        "map_pci_device: vendor: {}, product: {}",
+        vendor, product
+    );
+    if let Some(tag) = pci::find_device(vendor as u32, product as u32) {
+        // Get BAR0 memory
+        if let Some((base, len)) = unsafe { tag.get_bar_mem(0) } {
+            let mut proc = process();
+            let virt_addr = proc.memory_set.find_free_area(0, len);
+            let attr = MemoryAttr::default().user();
+            proc.memory_set.push(
+                virt_addr,
+                virt_addr + len,
+                attr,
+                Linear::new(base as isize - virt_addr as isize),
+                "pci",
+            );
+            Ok(virt_addr)
+        } else {
+            Err(SysError::ENOENT)
+        }
+    } else {
+        Err(SysError::ENOENT)
+    }
+}
\ No newline at end of file
diff --git a/kernel/src/syscall/mod.rs b/kernel/src/syscall/mod.rs
index 43e4ba5..bad01f1 100644
--- a/kernel/src/syscall/mod.rs
+++ b/kernel/src/syscall/mod.rs
@@ -21,6 +21,7 @@ use self::proc::*;
 use self::time::*;
 use self::net::*;
 use self::misc::*;
+use self::custom::*;
 
 mod fs;
 mod mem;
@@ -28,6 +29,7 @@ mod proc;
 mod time;
 mod net;
 mod misc;
+mod custom;
 
 /// System call dispatcher
 pub fn syscall(id: usize, args: [usize; 6], tf: &mut TrapFrame) -> isize {
@@ -124,6 +126,8 @@ pub fn syscall(id: usize, args: [usize; 6], tf: &mut TrapFrame) -> isize {
         228 => sys_clock_gettime(args[0], args[1] as *mut TimeSpec),
         231 => sys_exit_group(args[0]),
         288 => sys_accept(args[0], args[1] as *mut SockAddr, args[2] as *mut u32), // use accept for accept4
+        // custom temporary syscall
+        999 => sys_map_pci_device(args[0], args[1]),
 //        293 => sys_pipe(),
 
         // for musl: empty impl
@@ -151,6 +155,10 @@ pub fn syscall(id: usize, args: [usize; 6], tf: &mut TrapFrame) -> isize {
             warn!("sys_alarm is unimplemented");
             Ok(0)
         }
+        038 => {
+            warn!("sys_setitimer is unimplemented");
+            Ok(0)
+        }
         072 => {
             warn!("sys_fcntl is unimplemented");
             Ok(0)