xapic: Use non-static lifetime

The use of 'static lifetime for the MMIO access is unecessary and prevents
normal use of the XAPIC object in a variety of situtations, such as those with
a limited-lifetime virtual memory mapping.

Using a non-static lifetime for MMIO access allows greater flexibilty.

src/apic/xapic.rs

@@ -192,14 +192,14 @@ enum ApicRegister {
 
 /// State for the XAPIC driver.
 #[allow(clippy::clippy::upper_case_acronyms)]
-pub struct XAPIC {
+pub struct XAPIC<'a> {
  /// Reference to the xAPCI region
- mmio_region: &'static mut [u32],
+ mmio_region: &'a mut [u32],
  /// Initial APIC Base register value.
  base: u64,
 }
 
-impl fmt::Debug for XAPIC {
+impl fmt::Debug for XAPIC<'_> {
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  f.debug_struct("XAPIC")
  .field("XAPIC_ID", &self.read(ApicRegister::XAPIC_ID))
@@ -262,12 +262,12 @@ impl fmt::Debug for XAPIC {
  }
 }
 
-impl XAPIC {
+impl XAPIC<'_> {
  /// Create a new xAPIC object for the local CPU.
  ///
  /// Pass the xAPCI region which is at XXX unless you have
  /// relocated the region.
- pub fn new(apic_region: &'static mut [u32]) -> XAPIC {
+ pub fn new<'a>(apic_region: &'a mut [u32]) -> XAPIC {
  unsafe {
  XAPIC {
  mmio_region: apic_region,
@@ -315,7 +315,7 @@ impl XAPIC {
  }
 }
 
-impl ApicControl for XAPIC {
+impl ApicControl for XAPIC<'_> {
  /// Is this the bootstrap core?
  fn bsp(&self) -> bool {
  (self.base & (1 << 8)) > 0