RedBear-OS/local/patches/kernel/redox.patch.bak

diff --git a/src/acpi/madt/mod.rs b/src/acpi/madt/mod.rs
index 3159b9c4..c691eb8d 100644
--- a/src/acpi/madt/mod.rs
+++ b/src/acpi/madt/mod.rs
@@ -146,6 +146,52 @@ pub struct MadtGicd {
     _reserved2: [u8; 3],
 }
 
+/// MADT Local x2APIC (entry type 0x9)
+/// Used by modern AMD and Intel platforms with APIC IDs >= 255.
+#[derive(Clone, Copy, Debug)]
+#[repr(C, packed)]
+pub struct MadtLocalX2Apic {
+    _reserved: u16,
+    pub x2apic_id: u32,
+    pub flags: u32,
+    pub processor_uid: u32,
+}
+
+/// MADT Local APIC NMI (entry type 0x4)
+/// Configures NMI routing to a processor's LINT0/LINT1 pin.
+#[derive(Clone, Copy, Debug)]
+#[repr(C, packed)]
+pub struct MadtLocalApicNmi {
+    pub processor: u8,
+    pub flags: u16,
+    pub nmi_pin: u8,
+}
+
+/// MADT Local APIC Address Override (entry type 0x5)
+/// Provides 64-bit override for the 32-bit local APIC address.
+#[derive(Clone, Copy, Debug)]
+#[repr(C, packed)]
+pub struct MadtLapicAddressOverride {
+    _reserved: u16,
+    pub local_apic_address: u64,
+}
+
+/// MADT Local x2APIC NMI (entry type 0xA)
+/// x2APIC equivalent of type 0x4 for APIC IDs >= 255.
+#[derive(Clone, Copy, Debug)]
+#[repr(C, packed)]
+pub struct MadtLocalX2ApicNmi {
+    _reserved: u16,
+    pub processor_uid: u32,
+    pub flags: u16,
+    pub nmi_pin: u8,
+    _reserved2: u8,
+}
+
+const _: () = assert!(size_of::<MadtLocalApicNmi>() == 4);
+const _: () = assert!(size_of::<MadtLapicAddressOverride>() == 10);
+const _: () = assert!(size_of::<MadtLocalX2ApicNmi>() == 10);
+
 /// MADT Entries
 #[derive(Debug)]
 #[allow(dead_code)]
@@ -160,6 +206,14 @@ pub enum MadtEntry {
     InvalidGicc(usize),
     Gicd(&'static MadtGicd),
     InvalidGicd(usize),
+    LocalX2Apic(&'static MadtLocalX2Apic),
+    InvalidLocalX2Apic(usize),
+    LocalApicNmi(&'static MadtLocalApicNmi),
+    InvalidLocalApicNmi(usize),
+    LapicAddressOverride(&'static MadtLapicAddressOverride),
+    InvalidLapicAddressOverride(usize),
+    LocalX2ApicNmi(&'static MadtLocalX2ApicNmi),
+    InvalidLocalX2ApicNmi(usize),
     Unknown(u8),
 }
 
@@ -176,6 +230,10 @@ impl Iterator for MadtIter {
             let entry_len =
                 unsafe { *(self.sdt.data_address() as *const u8).add(self.i + 1) } as usize;
 
+            if entry_len < 2 {
+                return None;
+            }
+
             if self.i + entry_len <= self.sdt.data_len() {
                 let item = match entry_type {
                     0x0 => {
@@ -224,6 +282,44 @@ impl Iterator for MadtIter {
                             MadtEntry::InvalidGicd(entry_len)
                         }
                     }
+                    0x9 => {
+                        if entry_len == size_of::<MadtLocalX2Apic>() + 2 {
+                            MadtEntry::LocalX2Apic(unsafe {
+                                &*((self.sdt.data_address() + self.i + 2) as *const MadtLocalX2Apic)
+                            })
+                        } else {
+                            MadtEntry::InvalidLocalX2Apic(entry_len)
+                        }
+                    }
+                    0x4 => {
+                        if entry_len == size_of::<MadtLocalApicNmi>() + 2 {
+                            MadtEntry::LocalApicNmi(unsafe {
+                                &*((self.sdt.data_address() + self.i + 2) as *const MadtLocalApicNmi)
+                            })
+                        } else {
+                            MadtEntry::InvalidLocalApicNmi(entry_len)
+                        }
+                    }
+                    0x5 => {
+                        if entry_len == size_of::<MadtLapicAddressOverride>() + 2 {
+                            MadtEntry::LapicAddressOverride(unsafe {
+                                &*((self.sdt.data_address() + self.i + 2)
+                                    as *const MadtLapicAddressOverride)
+                            })
+                        } else {
+                            MadtEntry::InvalidLapicAddressOverride(entry_len)
+                        }
+                    }
+                    0xA => {
+                        if entry_len == size_of::<MadtLocalX2ApicNmi>() + 2 {
+                            MadtEntry::LocalX2ApicNmi(unsafe {
+                                &*((self.sdt.data_address() + self.i + 2)
+                                    as *const MadtLocalX2ApicNmi)
+                            })
+                        } else {
+                            MadtEntry::InvalidLocalX2ApicNmi(entry_len)
+                        }
+                    }
                     _ => MadtEntry::Unknown(entry_type),
                 };
 

diff --git a/src/devices/graphical_debug/mod.rs b/src/devices/graphical_debug/mod.rs
index b701c9a8..00cc984d 100644
--- a/src/devices/graphical_debug/mod.rs
+++ b/src/devices/graphical_debug/mod.rs
@@ -59,7 +59,12 @@ pub fn init(env: &[u8]) {
     );
 
     let debug_display = DebugDisplay::new(width, height, stride, virt as *mut u32);
-    *DEBUG_DISPLAY.lock() = Some(debug_display);
+    // FIXME: Writing to the framebuffer during early boot causes a hang on some
+    // QEMU configurations (virtio-vga, ramfb). The bootloader maps the framebuffer
+    // with default caching; the kernel remaps it with write-combining in memory::init().
+    // Early kernel access before that remap appears to stall. Deferring DEBUG_DISPLAY
+    // setup avoids the hang; userspace vesad/fbbootlogd handles graphical output.
+    // *DEBUG_DISPLAY.lock() = Some(debug_display);
 }
 
 #[allow(unused)]