Implement pool quota accounting and stub raise functionality

xtoskrnl/CMakeLists.txt

@@ -81,6 +81,7 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/mm/pfn.cc
     ${XTOSKRNL_SOURCE_DIR}/mm/pool.cc
     ${XTOSKRNL_SOURCE_DIR}/mm/pte.cc
+    ${XTOSKRNL_SOURCE_DIR}/mm/quota.cc
     ${XTOSKRNL_SOURCE_DIR}/po/idle.cc
     ${XTOSKRNL_SOURCE_DIR}/ps/process.cc
     ${XTOSKRNL_SOURCE_DIR}/ps/thread.cc

xtoskrnl/includes/mm.hh

@@ -24,5 +24,6 @@
 #include <mm/pfault.hh>
 #include <mm/pfn.hh>
 #include <mm/pool.hh>
+#include <mm/quota.hh>
 
 #endif /* __XTOSKRNL_MM_HH */

xtoskrnl/includes/mm/quota.hh

@@ -0,0 +1,33 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/includes/mm/quota.hh
+ * DESCRIPTION:     Memory Manager Quota support
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#ifndef __XTOSKRNL_MM_QUOTA_HH
+#define __XTOSKRNL_MM_QUOTA_HH
+
+#include <xtos.hh>
+
+
+/* Memory Manager */
+namespace MM
+{
+    class Quota
+    {
+        private:
+            STATIC SIZE_T PagedPoolQuota;
+            STATIC SIZE_T NonPagedPoolQuota;
+
+        public:
+            STATIC XTAPI BOOLEAN RaisePoolQuota(IN MMPOOL_TYPE PoolType,
+                                                IN SIZE_T CurrentQuotaLimit,
+                                                OUT PSIZE_T NewQuotaLimit);
+            STATIC XTAPI VOID ReturnPoolQuota(IN MMPOOL_TYPE PoolType,
+                                              IN SIZE_T ReturnedQuota);
+    };
+}
+
+#endif /* __XTOSKRNL_MM_QUOTA_HH */

xtoskrnl/mm/quota.cc

@@ -0,0 +1,69 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/mm/quota.cc
+ * DESCRIPTION:     Memory Manager Quota support
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#include <xtos.hh>
+
+
+/**
+ * Attempts to increase the pool quota limit.
+ *
+ * @param PoolType
+ *        Supplies the type of memory pool whose quota limit is being evaluated for an increase.
+ *
+ * @param CurrentQuotaLimit
+ *        Supplies the current quota limit, in bytes, for the requested pool.
+ *
+ * @param NewQuotaLimit
+ *        Receives the newly established quota limit if the increase was successful.
+ *
+ * @return This routine returns TRUE if the quota limit was successfully raised, or FALSE otherwise.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+BOOLEAN
+MM::Quota::RaisePoolQuota(IN MMPOOL_TYPE PoolType,
+                          IN SIZE_T CurrentQuotaLimit,
+                          OUT PSIZE_T NewQuotaLimit
+)
+{
+    UNIMPLEMENTED;
+    return FALSE;
+}
+
+/**
+ * Returns a specified amount of quota back to the global system pool.
+ *
+ * @param PoolType
+ *        Supplies the type of memory pool receiving the returned quota.
+ *
+ * @param ReturnedQuota
+ *        Supplies the amount of quota, in bytes, being returned to the system.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+MM::Quota::ReturnPoolQuota(IN MMPOOL_TYPE PoolType,
+                           IN SIZE_T ReturnedQuota)
+{
+    /* Route the returned quota to the appropriate pool */
+    switch(PoolType)
+    {
+        case PagedPool:
+            /* Return quota to the paged pool */
+            PagedPoolQuota -= ReturnedQuota;
+            break;
+        default:
+            /* Return quota to the non-paged pool */
+            NonPagedPoolQuota -= ReturnedQuota;
+            break;
+    }
+}