1 files changed, 32 insertions, 2 deletions

diff --git a/mem/phys.c b/mem/phys.c
index 00f3531..bf56b77 100644
--- a/mem/phys.c
+++ b/mem/phys.c
@@ -1,9 +1,39 @@
 #include "memory.h"
 #include "zone.h"
+#include "lib/jove.h"
+
+void
+mem_phys_reserve(physptr_t start, physptr_t end)
+{
+    size_t zone = mem_zone_for(start);
+    size_t limit = mem_zone_bound_upper(zone);
+
+    if(end > limit) {
+        mem_phys_reserve(limit, end);
+        end = limit;
+    }
+    mem_zone_resv(MEM_ZONE_STANDARD, start, end);
+}
+
+void 
+mem_phys_release(physptr_t start, physptr_t end)
+{
+    size_t zone = mem_zone_for(start);
+    size_t limit = mem_zone_bound_upper(zone);
+
+    if(end > limit) {
+        mem_phys_release(limit, end);
+        end = limit;
+    }
+    mem_zone_free(MEM_ZONE_STANDARD, start, end);
+}
 
 physptr_t
 mem_phys_alloc(size_t pages)
 {
-    physptr_t ptr = mem_zone_alloc(MEM_ZONE_STANDARD, pages);
-    return ptr;
+    if(mem_zone_pages_free(MEM_ZONE_HIGHER) >= pages)
+        return mem_zone_alloc(MEM_ZONE_HIGHER, pages);
+    if(mem_zone_pages_free(MEM_ZONE_STANDARD) >= pages)
+        return mem_zone_alloc(MEM_ZONE_STANDARD, pages);
+    kpanic("Kernel ran out of physical memory!\n");
 }