feat: don't truncate reserved bits in CommandRegister

Signed-off-by: Martin Kröning <martin.kroening@eonerc.rwth-aachen.de>

Author: mkroening

src/lib.rs

@@ -162,15 +162,15 @@ impl PciHeader {
 
     pub fn command(&self, access: &impl ConfigRegionAccess) -> CommandRegister {
         let data = unsafe { access.read(self.0, 0x4).get_bits(0..16) };
-        CommandRegister::from_bits_truncate(data as u16)
+        CommandRegister::from_bits_retain(data as u16)
     }
 
     pub fn update_command<F>(&self, access: &impl ConfigRegionAccess, f: F)
     where
         F: FnOnce(CommandRegister) -> CommandRegister,
     {
         let mut data = unsafe { access.read(self.0, 0x4) };
-        let new_command = f(CommandRegister::from_bits_truncate(data.get_bits(0..16) as u16));
+        let new_command = f(CommandRegister::from_bits_retain(data.get_bits(0..16) as u16));
         data.set_bits(0..16, new_command.bits() as u32);
         unsafe {
             access.write(self.0, 0x4, data);

src/register.rs

@@ -139,5 +139,6 @@ bitflags::bitflags! {
         const SERR_ENABLE = 1 << 8;
         const FAST_BACK_TO_BACK_ENABLE = 1 << 9;
         const INTERRUPT_DISABLE = 1 << 10;
+        const _ = !0;
     }
 }