feat(init): add init crate with declarative boot manifest, boot sequence, supervisor and shutdown stubs

Also: make types from_raw/raw const fn, add create_process/kill/delegate/revoke to userspace syscall stubs.

crates/init/src/manifest.rs

@@ -0,0 +1,92 @@
+use types::address::PhysicalAddress;
+use types::bounded::{CapSlot, Priority};
+use types::id::IrqId;
+
+#[derive(Debug, Clone, Copy)]
+pub enum HardwareCap {
+    Framebuffer { base: PhysicalAddress, pages: usize },
+    Irq { irq: IrqId },
+    Memory { base: PhysicalAddress, pages: usize },
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum EndpointBinding {
+    Own { name: &'static str },
+    ConnectTo { server: &'static str, endpoint: &'static str },
+}
+
+#[derive(Debug)]
+pub struct ServerEntry {
+    pub name: &'static str,
+    pub priority: Priority,
+    pub memory_pages: usize,
+    pub hardware_caps: &'static [HardwareCap],
+    pub endpoints: &'static [EndpointBinding],
+    pub restartable: bool,
+}
+
+#[derive(Debug)]
+pub struct AppEntry {
+    pub name: &'static str,
+    pub priority: Priority,
+    pub memory_pages: usize,
+    pub connects_to: &'static [(&'static str, &'static str)],
+}
+
+#[derive(Debug)]
+pub struct BootManifest {
+    pub servers: &'static [ServerEntry],
+    pub apps: &'static [AppEntry],
+}
+
+pub static SNAKE_MANIFEST: BootManifest = BootManifest {
+    servers: &[
+        ServerEntry {
+            name: "log",
+            priority: Priority::DEFAULT,
+            memory_pages: 64,
+            hardware_caps: &[],
+            endpoints: &[EndpointBinding::Own { name: "log" }],
+            restartable: true,
+        },
+        ServerEntry {
+            name: "permission",
+            priority: Priority::DEFAULT,
+            memory_pages: 32,
+            hardware_caps: &[],
+            endpoints: &[EndpointBinding::Own { name: "permission" }],
+            restartable: true,
+        },
+        ServerEntry {
+            name: "display",
+            priority: Priority::DEFAULT,
+            memory_pages: 256,
+            hardware_caps: &[
+                HardwareCap::Framebuffer {
+                    base: PhysicalAddress::from_raw(0x10008000),
+                    pages: 75,
+                },
+            ],
+            endpoints: &[EndpointBinding::Own { name: "display" }],
+            restartable: true,
+        },
+        ServerEntry {
+            name: "input",
+            priority: Priority::DEFAULT,
+            memory_pages: 32,
+            hardware_caps: &[
+                HardwareCap::Irq { irq: IrqId::from_raw(10) },
+            ],
+            endpoints: &[EndpointBinding::Own { name: "input" }],
+            restartable: true,
+        },
+    ],
+    apps: &[
+        AppEntry {
+            name: "snake",
+            priority: Priority::DEFAULT,
+            memory_pages: 64,
+            connects_to: &[("display", "display"), ("input", "input")],
+        },
+    ],
+};