fix: capacities single-sourced in types (display MAX_WINDOWS/BUFFER_PAGES, storage MAX_CLIENTS), display + storage budgets derived from them, const asserts on VA layouts; kernel regions 64 -> 256

crates/servers/display-server/src/host.rs

@@ -16,8 +16,11 @@ use crate::windows::MAX_WINDOWS;
 /// a 1280x800 window; high, clear of the GPU's mappings and of the heap,
 /// which grows from the bottom.
 const BUFFERS_VA: usize = 0x1000_0000;
-const BUFFER_SPAN: usize = 0x0040_0000;
 const PAGE: usize = 4096;
+const BUFFER_SPAN: usize = types::display::window::BUFFER_PAGES * PAGE;
+// Every window's buffer fits between here and the themes' reading buffer
+// (0x1800_0000), below the heap's end.
+const _: () = assert!(BUFFERS_VA + MAX_WINDOWS * BUFFER_SPAN <= 0x1800_0000 && 0x1800_0000 < types::layout::HEAP_END);
 
 pub struct KernelHost {
     /// The display's own endpoint, which window capabilities are minted

crates/servers/display-server/src/windows.rs

@@ -7,7 +7,7 @@
 
 use types::display::window::{BADGE, NAME_BYTES};
 
-pub const MAX_WINDOWS: usize = 8;
+pub use types::display::window::MAX_WINDOWS;
 /// Events received and not yet polled by the window in front.
 const QUEUED: usize = 32;
 

crates/servers/storage-server/src/lib.rs

@@ -24,6 +24,8 @@ use types::permission::{Permission, PermissionSet};
 
 /// Client buffers sit high in storage's window, clear of its heap.
 const BUFFERS_VA: VirtualAddress = VirtualAddress::from_raw(0x0100_0000);
+// Every client's buffer fits below the disk driver's mappings (0x01D0_0000).
+const _: () = assert!(0x0100_0000 + types::storage::MAX_CLIENTS * protocol::BUFFER_SIZE <= 0x01D0_0000);
 
 const EP: CapSlot = CapSlot::const_new(0);
 

crates/servers/storage-server/src/server.rs

@@ -9,8 +9,7 @@ use crate::scope::Scope;
 
 mod session;
 
-/// Connections at once: every program reading files, apps among them.
-const MAX_CLIENTS: usize = 16;
+use types::storage::MAX_CLIENTS;
 /// Handles at or past this are never valid (the file systems hand out
 /// fewer), so ownership fits a small table.
 const MAX_HANDLES: usize = 16;