Initializes vm_page_alloc (#1280)

kernel/src/main.rs

@@ -27,6 +27,7 @@ mod signal;
 mod subsystem;
 mod trap;
 mod uma;
+mod vm;
 
 extern crate alloc;
 

kernel/src/uma/aarch64.rs

@@ -0,0 +1,3 @@
+pub fn small_alloc() {
+    todo!()
+}

kernel/src/uma/keg.rs

@@ -1,3 +1,4 @@
+use super::arch::small_alloc;
 use super::slab::{Free, RcFree, Slab};
 use super::{Alloc, Uma, UmaFlags, UmaZone};
 use crate::config::{PAGE_MASK, PAGE_SHIFT, PAGE_SIZE};
@@ -9,6 +10,7 @@ use core::num::NonZero;
 pub struct UmaKeg {
     size: NonZero<usize>, // uk_size
     ipers: usize,         // uk_ipers
+    alloc: fn(),          // uk_allocf
     max_pages: u32,       // uk_maxpages
     pages: u32,           // uk_pages
     free: u32,            // uk_free
@@ -132,9 +134,13 @@ impl UmaKeg {
             }
         }
 
-        if ppera == 1 {
-            // TODO: Set uk_allocf and uk_freef.
-        }
+        // Get allocator.
+        let alloc = if ppera == 1 {
+            // TODO: Get uk_freef.
+            small_alloc
+        } else {
+            Self::page_alloc
+        };
 
         if flags.has(UmaFlags::MtxClass) {
             todo!()
@@ -159,6 +165,7 @@ impl UmaKeg {
         Self {
             size,
             ipers,
+            alloc,
             max_pages: 0,
             pages: 0,
             free: 0,
@@ -220,7 +227,18 @@ impl UmaKeg {
         if self.flags.has(UmaFlags::Offpage) {
             todo!()
         } else {
+            (self.alloc)();
             todo!()
         }
     }
+
+    /// See `page_alloc` on the Orbis for a reference.
+    ///
+    /// # Reference offsets
+    /// | Version | Offset |
+    /// |---------|--------|
+    /// |PS4 11.00|0x1402F0|
+    fn page_alloc() {
+        todo!()
+    }
 }

kernel/src/uma/mod.rs

@@ -12,6 +12,9 @@ use core::num::NonZero;
 use core::sync::atomic::AtomicBool;
 use macros::bitflag;
 
+#[cfg_attr(target_arch = "aarch64", path = "aarch64.rs")]
+#[cfg_attr(target_arch = "x86_64", path = "x86_64.rs")]
+mod arch;
 mod boxed;
 mod bucket;
 mod keg;

kernel/src/uma/x86_64.rs

@@ -0,0 +1,14 @@
+use crate::vm::alloc_page;
+
+/// See `uma_small_alloc` on the Orbis for a reference.
+///
+/// # Reference offsets
+/// | Version | Offset |
+/// |---------|--------|
+/// |PS4 11.00|0x22FD70|
+pub fn small_alloc() {
+    // TODO: There are an increment on an unknown variable on the Orbis.
+    alloc_page();
+
+    todo!()
+}

kernel/src/vm/mod.rs

@@ -0,0 +1,9 @@
+/// See `vm_page_alloc` on the Orbis for a reference.
+///
+/// # Reference offsets
+/// | Version | Offset |
+/// |---------|--------|
+/// |PS4 11.00|0x02B030|
+pub fn alloc_page() {
+    todo!()
+}