Boot info memory mapping implementation

1 files changed, 62 insertions, 0 deletions

diff --git a/kernel/multiboot.dats b/kernel/multiboot.dats
new file mode 100644
index 0000000..bc3b552
--- /dev/null
+++ b/kernel/multiboot.dats
@@ -0,0 +1,62 @@
+#include "./prelude/kernel_prelude.hats"
+
+#define ATS_DYNLOADFLAG 0
+
+staload "./multiboot.sats"
+staload UN = "prelude/SATS/unsafe.sats"
+
+local
+
+var boot_info : boot_info_t
+
+in
+
+implement boot_info_init (p : Ptr1) = let
+  extern praxi __assert{l:addr} (ptr: ptr (l)): vtakeout0 (boot_info_t@l) // takeout proof  UNSAFE:
+  prval (pf, fpf) = __assert (addr@boot_info)
+  val total_size = $UN.ptr0_get<uint>(p)
+
+  fun loop {l : agz} (pf : !boot_info_t@l | boot_p : ptr l , p : ptr): void = let
+    val type = $UN.ptr0_get<uint>(p)
+    val size = $UN.ptr0_get<uint>(ptr_succ<uint>(p))
+    val next = (if (size % 8u != 0) then size + 8u - (size % 8u) else size) : uint
+  in 
+    case+ type of 
+      | 6u => (
+               boot_p->memory_map := $UN.ptr0_get<memory_map_t>(p); 
+               boot_p->memory_map.entries := ptr_add<uint>(p,4)
+              )
+      | _ => ();
+
+    if (type != 0u) then
+      loop(pf | boot_p, ptr_add<uint8>(p, next))
+  end
+
+in
+  boot_info.total_size := total_size;
+  loop(pf | addr@boot_info, ptr_add<uint32>(p,2));
+
+  (pf , fpf | addr@boot_info)
+end
+
+end
+
+extern castfn ui2sz (n : uint) : size_t
+
+implement get_memory_mappings_n(p) = let
+  val size = p.2->memory_map.tag.size 
+  val n_entries = (if(size >= 16u) then (size - 16u) / p.2->memory_map.entry_size else 0u) : uint
+in
+  ui2sz n_entries
+end
+
+// TODO: here use optional datatype (fix runtime )
+
+implement get_memory_mapping(p,n) = let
+  val size = p.2->memory_map.tag.size 
+  val n_entries = ui2sz (if(size >= 16u) then (size - 16u) / p.2->memory_map.entry_size else 0u)
+in
+  assertloc(n < n_entries);
+  $UN.ptr0_get<memory_entry_t>(ptr_add<memory_map_t>(p.2->memory_map.entries,n))
+end
+