From 58096a11ea200d4caf656bac712cde24daa8a697 Mon Sep 17 00:00:00 2001
From: Xander <xander@biltopia.org>
Date: Fri, 21 Jul 2023 22:38:43 +0200
Subject: Working frame allocator but VERY ugly code

---
 kernel/memory/frame.dats | 23 +++++++++++------------
 kernel/memory/frame.sats |  2 +-
 2 files changed, 12 insertions(+), 13 deletions(-)

(limited to 'kernel/memory')

diff --git a/kernel/memory/frame.dats b/kernel/memory/frame.dats
index 8578e8f..b1d86af 100644
--- a/kernel/memory/frame.dats
+++ b/kernel/memory/frame.dats
@@ -2,18 +2,12 @@
 
 #define ATS_DYNLOADFLAG 0
 
-macdef invalid_area = @{
-  base_addr = the_null_ptr,
-  length = 1,
-  type = 0u,
-  reserved = 0
-}
-
 staload "./frame.sats"
 staload "kernel/bootinfo/multiboot.sats"
 
 staload UN = "prelude/SATS/unsafe.sats"
 
+
 implement containing_address(address) : frame_t = 
   @{ 
     counter = $UN.cast{size_t}(address) / i2sz(PAGE_SIZE)
@@ -55,15 +49,20 @@ var frame_allocator : frame_allocator_t
 
 in
 
-  implement frame_allocator_init() : allocptr = let
+  implement frame_allocator_init(kernel_start, kernel_end, multiboot_start, multiboot_end, b) : allocptr = let
     extern praxi __assert{l:addr} (ptr: ptr (l)): vtakeout0 (frame_allocator_t@l) // takeout proof  UNSAFE:
     prval (pf, fpf) = __assert (addr@frame_allocator) 
     val allocator = @{ 
       next_free_frame = containing_address(the_null_ptr),
-      current_area = invalid_area
+      current_area = invalid_area,
+      kernel_start = containing_address(kernel_start),
+      kernel_end = containing_address(kernel_end),
+      multiboot_start = containing_address(multiboot_start),
+      multiboot_end = containing_address(multiboot_end)
     }
   in
-
+    frame_allocator := allocator;
+    choose_next_area(pf,b.0 | addr@frame_allocator, b.2);
     (pf, fpf | addr@frame_allocator)
   end
 
@@ -81,11 +80,11 @@ implement allocate_frame(pf , bf | p,b) : frame_t =
         // all frames of current area are used, switch to next area
         choose_next_area(pf, bf | p,b);
         allocate_frame(pf,bf | p,b)
-      ) else if (frame.num > p->kernel_start.num && frame.num <= p->kernel_end.num) then (
+      ) else if (frame.num >= p->kernel_start.num && frame.num <= p->kernel_end.num) then (
         // frame is used by kernel
         p->next_free_frame := @{num = p->kernel_end.num + 1};
         allocate_frame(pf,bf | p,b)
-      ) else if (frame.num > p->multiboot_start.num && frame.num <= p->multiboot_end.num) then (
+      ) else if (frame.num >= p->multiboot_start.num && frame.num <= p->multiboot_end.num) then (
         // frame is used by multiboot info structure
         p->next_free_frame := @{num = p->multiboot_end.num + 1};
         allocate_frame(pf,bf | p,b)
diff --git a/kernel/memory/frame.sats b/kernel/memory/frame.sats
index 0d29298..d965567 100644
--- a/kernel/memory/frame.sats
+++ b/kernel/memory/frame.sats
@@ -20,4 +20,4 @@ vtypedef allocptr  = [l : agz] (frame_allocator_t@l , frame_allocator_t@l -<lin,
 fn containing_address {l : addr} (address : ptr l) : frame_t
 fn allocate_frame {l : agz}{k : agz} (pf : !frame_allocator_t @ l >> frame_allocator_t @ l, bf : !boot_info_t @ k | p : ptr l, b : ptr k) : frame_t
 fn deallocate_frame (p : !allocptr) : void
-fn frame_allocator_init() : allocptr
+fn frame_allocator_init(kernel_start: Ptr, kernel_end: Ptr, multiboot_start:Ptr, multiboot_end: Ptr, b : !bootptr) : allocptr
-- 
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