x86_64: only initialize BSP LAPIC

1 files changed, 23 insertions, 7 deletions

diff --git a/arch/x86_64/src/devices/local_apic.cpp b/arch/x86_64/src/devices/local_apic.cpp
index 91e907a..e24e1d4 100644
--- a/arch/x86_64/src/devices/local_apic.cpp
+++ b/arch/x86_64/src/devices/local_apic.cpp
@@ -20,24 +20,40 @@ namespace arch::devices
   }  // namespace
 
   local_apic::local_apic(std::size_t major, std::size_t minor, std::uint64_t hardware_id,
-                         kapi::memory::physical_address base)
+                         kapi::memory::physical_address base, bool is_bsp)
       : kapi::devices::device{major, minor, "lapic"}
       , m_hardware_id{hardware_id}
       , m_base{base}
+      , m_is_bsp{is_bsp}
   {}
 
   auto local_apic::init() -> bool
   {
-    m_virtual_base = kapi::memory::allocate_mmio_region(1);
-    if (!kapi::memory::map_mmio_region(m_virtual_base, m_base, kapi::memory::page_mapper::flags::writable))
+    auto static shared_virtual_base = kapi::memory::allocate_mmio_region(1);
+    auto static is_mapped = false;
+
+    if (!is_mapped)
     {
-      kstd::println("[x86_64:DEV] LAPIC {} MMIO mapping failed!", m_hardware_id);
-      return false;
+      if (!kapi::memory::map_mmio_region(shared_virtual_base, m_base, kapi::memory::page_mapper::flags::writable))
+      {
+        kstd::println("[x86_64:DEV] LAPIC {} MMIO mapping failed!", m_hardware_id);
+        return false;
+      }
+      is_mapped = true;
     }
 
-    write_register(lapic_sivr_register, lapic_enable_bit | spurious_interrupt_vector);
+    m_virtual_base = shared_virtual_base;
+
+    if (m_is_bsp)
+    {
+      write_register(lapic_sivr_register, lapic_enable_bit | spurious_interrupt_vector);
 
-    kstd::println("[x86_64:DEV] LAPIC {} initialized. {:#018x}@{:#018x}", m_hardware_id, m_base, m_virtual_base);
+      kstd::println("[x86_64:DEV] LAPIC {} initialized. {:#018x}@{:#018x}", m_hardware_id, m_base, m_virtual_base);
+    }
+    else
+    {
+      kstd::println("[x86_64:DEV] LAPIC {} is not on the BSP, deferring intialization.", m_hardware_id);
+    }
 
     return true;
   }