diff --git a/ahcid/src/main.rs b/ahcid/src/main.rs
index fcd3c0920d..166214934c 100644
--- a/ahcid/src/main.rs
+++ b/ahcid/src/main.rs
@@ -82,22 +82,16 @@ fn daemon(daemon: redox_daemon::Daemon) -> ! {
     let mut name = pci_config.func.name();
     name.push_str("_ahci");
 
-    let (bar, bar_size) = pci_config.func.bars[5].expect_mem();
+    let bar = &pci_config.func.bars[5];
+    let (bar_ptr, bar_size) = bar.expect_mem();
 
     let irq = pci_config.func.legacy_interrupt_line.expect("ahcid: no legacy interrupts supported");
 
     let _logger_ref = setup_logging(&name);
 
-    info!(" + AHCI {} on: {} size: {} IRQ: {}", name, bar, bar_size, irq);
+    info!(" + AHCI {} on: {} size: {} IRQ: {}", name, bar_ptr, bar_size, irq);
 
-    let address = unsafe {
-        common::physmap(
-            bar,
-            bar_size,
-            common::Prot { read: true, write: true },
-            common::MemoryType::Uncacheable,
-        ).expect("ahcid: failed to map address")
-    };
+    let address = unsafe { bar.physmap_mem("ahcid") };
     {
         let scheme_name = format!("disk.{}", name);
         let socket_fd = syscall::open(
diff --git a/e1000d/src/main.rs b/e1000d/src/main.rs
index 094ec47b03..d77c3f82f0 100644
--- a/e1000d/src/main.rs
+++ b/e1000d/src/main.rs
@@ -68,11 +68,12 @@ fn main() {
     let mut name = pci_config.func.name();
     name.push_str("_e1000");
 
-    let (bar, bar_size) = pci_config.func.bars[0].expect_mem();
+    let bar = &pci_config.func.bars[0];
+    let (bar_ptr, bar_size) = bar.expect_mem();
 
     let irq = pci_config.func.legacy_interrupt_line.expect("e1000d: no legacy interrupts supported");
 
-    eprintln!(" + E1000 {} on: {:X} size: {} IRQ: {}", name, bar, bar_size, irq);
+    eprintln!(" + E1000 {} on: {:X} size: {} IRQ: {}", name, bar_ptr, bar_size, irq);
 
     redox_daemon::Daemon::new(move |daemon| {
         let socket_fd = syscall::open(
@@ -86,10 +87,7 @@ fn main() {
 
         let mut irq_file = irq.irq_handle("e1000d");
 
-        let address = unsafe {
-            common::physmap(bar, bar_size, common::Prot::RW, common::MemoryType::Uncacheable)
-                .expect("e1000d: failed to map address")
-        } as usize;
+        let address = unsafe { bar.physmap_mem("e1000d") } as usize;
         {
             let device = Arc::new(RefCell::new(unsafe {
                 device::Intel8254x::new(address).expect("e1000d: failed to allocate device")
diff --git a/ihdad/src/main.rs b/ihdad/src/main.rs
index f447df8566..f603197608 100755
--- a/ihdad/src/main.rs
+++ b/ihdad/src/main.rs
@@ -155,14 +155,12 @@ fn daemon(daemon: redox_daemon::Daemon) -> ! {
     let mut name = pci_config.func.name();
     name.push_str("_ihda");
 
-    let (bar_ptr, bar_size) = pci_config.func.bars[0].expect_mem();
+    let bar = &pci_config.func.bars[0];
+    let (bar_ptr, bar_size) = bar.expect_mem();
 
     log::info!(" + IHDA {} on: {:#X} size: {}", name, bar_ptr, bar_size);
 
-	let address = unsafe {
-		common::physmap(bar_ptr, bar_size, common::Prot::RW, common::MemoryType::Uncacheable)
-			.expect("ihdad: failed to map address") as usize
-	};
+	let address = unsafe { bar.physmap_mem("ihdad") } as usize;
 
     //TODO: MSI-X
     let mut irq_file = get_int_method(&mut pcid_handle);
diff --git a/nvmed/src/main.rs b/nvmed/src/main.rs
index 6aeceeb7f8..8e57eb4db0 100644
--- a/nvmed/src/main.rs
+++ b/nvmed/src/main.rs
@@ -48,7 +48,12 @@ impl Bar {
 
 impl Drop for Bar {
     fn drop(&mut self) {
-        let _ = unsafe { syscall::funmap(self.physical, self.bar_size.next_multiple_of(PAGE_SIZE)) };
+        let _ = unsafe {
+            syscall::funmap(
+                self.ptr.as_ptr() as usize,
+                self.bar_size.next_multiple_of(PAGE_SIZE),
+            )
+        };
     }
 }
 
@@ -288,24 +293,16 @@ fn daemon(daemon: redox_daemon::Daemon) -> ! {
 
     let _logger_ref = setup_logging(&scheme_name);
 
-    let (bar, bar_size) = pci_config.func.bars[0].expect_mem();
-    let irq = pci_config.func.legacy_interrupt_line;
+    let bar = &pci_config.func.bars[0];
+    let (bar_ptr, bar_size) = bar.expect_mem();
 
     log::debug!("NVME PCI CONFIG: {:?}", pci_config);
 
     let allocated_bars = AllocatedBars::default();
 
-    let address = unsafe {
-        common::physmap(
-            bar,
-            bar_size,
-            common::Prot { read: true, write: true },
-            common::MemoryType::Uncacheable,
-        )
-        .expect("nvmed: failed to map address")
-    } as usize;
+    let address = unsafe { bar.physmap_mem("nvmed") } as usize;
     *allocated_bars.0[0].lock().unwrap() = Some(Bar {
-        physical: bar,
+        physical: bar_ptr,
         bar_size,
         ptr: NonNull::new(address as *mut u8).expect("Physmapping BAR gave nullptr"),
     });
diff --git a/pcid/src/pci/bar.rs b/pcid/src/pci/bar.rs
index 4ee887d91f..fa497d755b 100644
--- a/pcid/src/pci/bar.rs
+++ b/pcid/src/pci/bar.rs
@@ -41,4 +41,18 @@ impl PciBar {
             PciBar::None => panic!("expected BAR to exist"),
         }
     }
+
+    pub unsafe fn physmap_mem(&self, driver: &str) -> *mut () {
+        let (bar, bar_size) = self.expect_mem();
+        unsafe {
+            common::physmap(
+                bar,
+                bar_size,
+                common::Prot::RW,
+                // FIXME once the kernel supports this use write-through for prefetchable BAR
+                common::MemoryType::Uncacheable,
+            )
+        }
+        .unwrap_or_else(|err| panic!("{driver}: failed to map BAR at {bar:016X}: {err}"))
+    }
 }
diff --git a/rtl8139d/src/main.rs b/rtl8139d/src/main.rs
index 703fc55f1b..771683010a 100644
--- a/rtl8139d/src/main.rs
+++ b/rtl8139d/src/main.rs
@@ -169,12 +169,10 @@ fn get_int_method(pcid_handle: &mut PcidServerHandle) -> File {
         let pba_base = capability.pba_base_pointer(pci_config.func.bars);
 
         let bir = capability.table_bir() as usize;
-        let (bar_ptr, bar_size) = pci_config.func.bars[bir].expect_mem();
+        let bar = &pci_config.func.bars[bir];
+        let (bar_ptr, bar_size) = bar.expect_mem();
 
-        let address = unsafe {
-            common::physmap(bar_ptr, bar_size, common::Prot::RW, common::MemoryType::Uncacheable)
-                .expect("rtl8139d: failed to map address") as usize
-        };
+        let address = unsafe { bar.physmap_mem("rtl8139d") } as usize;
 
         if !(bar_ptr as u64..bar_ptr as u64 + bar_size as u64).contains(&(table_base as u64 + table_min_length as u64)) {
             panic!("Table {:#x}{:#x} outside of BAR {:#x}:{:#x}", table_base, table_base + table_min_length as usize, bar_ptr, bar_ptr + bar_size);
diff --git a/rtl8168d/src/main.rs b/rtl8168d/src/main.rs
index 19140b6f9a..c38b506d21 100644
--- a/rtl8168d/src/main.rs
+++ b/rtl8168d/src/main.rs
@@ -167,12 +167,10 @@ fn get_int_method(pcid_handle: &mut PcidServerHandle) -> File {
         let pba_base = capability.pba_base_pointer(pci_config.func.bars);
 
         let bir = capability.table_bir() as usize;
-        let (bar_ptr, bar_size) = pci_config.func.bars[bir].expect_mem();
+        let bar = &pci_config.func.bars[bir];
+        let (bar_ptr, bar_size) = bar.expect_mem();
 
-        let address = unsafe {
-            common::physmap(bar_ptr, bar_size, common::Prot::RW, common::MemoryType::Uncacheable)
-                .expect("rtl8168d: failed to map address") as usize
-        };
+        let address = unsafe { bar.physmap_mem("rtl8168d") } as usize;
 
         if !(bar_ptr as u64..bar_ptr as u64 + bar_size as u64).contains(&(table_base as u64 + table_min_length as u64)) {
             panic!("Table {:#x}{:#x} outside of BAR {:#x}:{:#x}", table_base, table_base + table_min_length as usize, bar_ptr, bar_ptr + bar_size);
diff --git a/vboxd/src/main.rs b/vboxd/src/main.rs
index 7905f00e7f..17a8c23a2d 100644
--- a/vboxd/src/main.rs
+++ b/vboxd/src/main.rs
@@ -196,11 +196,12 @@ fn main() {
 
     let bar0 = pci_config.func.bars[0].expect_port();
 
-    let (bar1, _) = pci_config.func.bars[1].expect_mem();
+    let bar1 = &pci_config.func.bars[1];
+    let (bar1_ptr, _) = bar1.expect_mem();
 
     let irq = pci_config.func.legacy_interrupt_line.expect("vboxd: no legacy interrupts supported");
 
-    print!("{}", format!(" + VirtualBox {} on: {:X}, {:X}, IRQ {}\n", name, bar0, bar1, irq));
+    print!("{}", format!(" + VirtualBox {} on: {:X}, {:X}, IRQ {}\n", name, bar0, bar1_ptr, irq));
 
     // Daemonize
     redox_daemon::Daemon::new(move |daemon| {
@@ -224,7 +225,7 @@ fn main() {
         let mut irq_file = irq.irq_handle("vboxd");
 
         let mut port = Pio::<u32>::new(bar0 as u16);
-        let address = unsafe { common::physmap(bar1, 4096, common::Prot::RW, common::MemoryType::Uncacheable).expect("vboxd: failed to map address") };
+        let address = unsafe { bar1.physmap_mem("vboxd") };
         {
             let vmmdev = unsafe { &mut *(address as *mut VboxVmmDev) };
 
diff --git a/virtio-core/src/arch/x86_64.rs b/virtio-core/src/arch/x86_64.rs
index 5bccd00c2a..a160f508cd 100644
--- a/virtio-core/src/arch/x86_64.rs
+++ b/virtio-core/src/arch/x86_64.rs
@@ -27,16 +27,10 @@ pub fn enable_msix(pcid_handle: &mut PcidServerHandle) -> Result<File, Error> {
     let pba_base = capability.pba_base_pointer(pci_config.func.bars);
 
     let bir = capability.table_bir() as usize;
-    let (bar_ptr, bar_size) = pci_config.func.bars[bir].expect_mem();
+    let bar = &pci_config.func.bars[bir];
+    let (bar_ptr, bar_size) = bar.expect_mem();
 
-    let address = unsafe {
-        common::physmap(
-            bar_ptr,
-            bar_size,
-            common::Prot::RW,
-            common::MemoryType::Uncacheable,
-        )? as usize
-    };
+    let address = unsafe { bar.physmap_mem("virtio-core") } as usize;
 
     // Ensure that the table and PBA are be within the BAR.
     {
diff --git a/xhcid/src/main.rs b/xhcid/src/main.rs
index 21ea4f9d4e..9f95131be7 100644
--- a/xhcid/src/main.rs
+++ b/xhcid/src/main.rs
@@ -232,12 +232,10 @@ fn daemon(daemon: redox_daemon::Daemon) -> ! {
     let _logger_ref = setup_logging(&name);
 
     log::debug!("XHCI PCI CONFIG: {:?}", pci_config);
-    let (bar_ptr, bar_size) = pci_config.func.bars[0].expect_mem();
+    let bar = &pci_config.func.bars[0];
+    let (bar_ptr, _) = bar.expect_mem();
 
-    let address = unsafe {
-        common::physmap(bar_ptr, bar_size, common::Prot::RW, common::MemoryType::Uncacheable)
-            .expect("xhcid: failed to map address") as usize
-    };
+    let address = unsafe { bar.physmap_mem("xhcid") } as usize;
 
     let (mut irq_file, interrupt_method) = get_int_method(&mut pcid_handle, address);