Remove page by given TYPE system call

Change-Id: Iffdd97a75944abbd52dbc72d3aa1394b771fd371
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/333
Tested-by: Jenkins Server
Reviewed-by: MATTHEW S. BARTH <msbarth@us.ibm.com>

3 files changed, 36 insertions, 0 deletions

diff --git a/src/include/kernel/syscalls.H b/src/include/kernel/syscalls.H
index 332273a07..bdffea120 100644
--- a/src/include/kernel/syscalls.H
+++ b/src/include/kernel/syscalls.H
@@ -94,6 +94,8 @@ namespace Systemcalls
 
             /** mm_alloc_block() */
         MM_ALLOC_BLOCK,
+            /** mm_remove_pages() */
+        MM_REMOVE_PAGES,
 
         SYSCALL_MAX
     };
diff --git a/src/include/kernel/vmmmgr.H b/src/include/kernel/vmmmgr.H
index 06533e34e..ff8702f53 100644
--- a/src/include/kernel/vmmmgr.H
+++ b/src/include/kernel/vmmmgr.H
@@ -25,6 +25,7 @@
 
 #include <limits.h>
 #include <sys/mmio.h>
+#include <sys/mm.h>
 #include <kernel/types.h>
 #include <kernel/spinlock.H>
 
@@ -108,6 +109,19 @@ class VmmManager
          */
         static uint64_t findPhysicalAddress(uint64_t i_vaddr);
         
+        /**
+         * @brief Remove pages by a specified operation of the given size
+         * @param[in] i_op - Page removal operation to perform
+         * @param[in] i_vaddr - Virtual address associated to page(s)
+         * @param[in] i_size - Size of memory to perform page removal on
+         * @return int - 0 for successful page removal, non-zero otherwise
+         *
+         * The given virtual address will be 'rounded' down to the nearest page
+         * boundary, along with the given size will be 'rounded' up to the
+         * nearest divisible page size.
+         */
+        static int mmRemovePages(PAGE_REMOVAL_OPS i_op, void* i_vaddr,
+                                 uint64_t i_size);
 
     protected:
         VmmManager();
diff --git a/src/include/sys/mm.h b/src/include/sys/mm.h
index ba9fe9e19..a14e4f83d 100644
--- a/src/include/sys/mm.h
+++ b/src/include/sys/mm.h
@@ -32,6 +32,15 @@ extern "C"
 {
 #endif
 
+/**
+ * Page removal operations
+ */
+enum PAGE_REMOVAL_OPS
+{
+    RELEASE,
+    FLUSH,
+};
+
 /** @fn mm_alloc_block()
  *  @brief System call to allocate virtual memory block in the base segment
  *
@@ -43,6 +52,17 @@ extern "C"
  */
 int mm_alloc_block(msg_q_t mq,void* va,uint64_t size);
 
+/** @fn mm_remove_pages()
+ *  @brief System call to remove pages by a specified operation
+ *
+ *  @param[in] i_op - Page removal operation to perform
+ *  @param[in] i_vaddr - Virtual address associated to page(s)
+ *  @param[in] size - Size of memory to perform page removal on
+ *
+ *  @return int - 0 for successful page removal, non-zero otherwise
+ */
+int mm_remove_pages(PAGE_REMOVAL_OPS i_op, void* i_vaddr, uint64_t i_size);
+
 #ifdef __cplusplus
 }
 #endif