Changeset 4765 in vbox

Timestamp:

Sep 13, 2007 10:09:04 AM (18 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

24450

Message:

Added SUPPageFreeLocked & SUPPageAllocLocked

Location:

trunk

Files:

• include/VBox/sup.h (modified) (1 diff)
• src/VBox/HostDrivers/Support/SUPLib.cpp (modified) (1 diff)

trunk/include/VBox/sup.h

@@ -369 +369 @@
 
 /**
+ * Allocate zero-filled locked pages.
+ *
+ * Use this to allocate a number of pages rather than using RTMem*() and mess with
+ * alignment. The returned address is of course page aligned. Call SUPPageFreeLocked()
+ * to free the pages once done with them.
+ *
+ * @returns VBox status.
+ * @param   cPages      Number of pages to allocate.
+ * @param   ppvPages    Where to store the base pointer to the allocated pages.
+ */
+SUPR3DECL(int) SUPPageAllocLocked(size_t cPages, void **ppvPages);
+
+/**
+ * Frees locked pages allocated with SUPPageAllocLocked().
+ *
+ * @returns VBox status.
+ * @param   pvPages     Pointer returned by SUPPageAlloc().
+ * @param   cPages      Number of pages that was allocated.
+ */
+SUPR3DECL(int) SUPPageFreeLocked(void *pvPages, size_t cPages);
+
+/**
  * Locks down the physical memory backing a virtual memory
  * range in the current process.

trunk/src/VBox/HostDrivers/Support/SUPLib.cpp

@@ -784 +784 @@
     return suplibOsPageFree(pvPages, cPages);
 #endif
+}
+
+SUPR3DECL(int) SUPPageAllocLocked(size_t cPages, void **ppvPages)
+{
+    /*
+     * Validate.
+     */
+    if (cPages == 0)
+    {
+        AssertMsgFailed(("Invalid param cPages=0, must be > 0\n"));
+        return VERR_INVALID_PARAMETER;
+    }
+    AssertPtr(ppvPages);
+    if (!ppvPages)
+        return VERR_INVALID_PARAMETER;
+    *ppvPages = NULL;
+
+    SUPALLOCPAGE_IN  In;
+    SUPALLOCPAGE_OUT Out;
+
+    In.u32Cookie        = g_u32Cookie;
+    In.u32SessionCookie = g_u32SessionCookie;
+    In.cPages           = cPages;
+    Out.u32Cookie       = g_u32Cookie;
+    int rc = suplibOsIOCtl(SUP_IOCTL_PAGE_ALLOC, &In, sizeof(In), &Out, sizeof(Out));
+    if (VBOX_SUCCESS(rc))
+        *ppvPages = Out.pvR3;
+
+    return rc;
+}
+
+SUPR3DECL(int) SUPPageFreeLocked(void *pvPages, size_t cPages)
+{
+    /*
+     * Validate.
+     */
+    AssertPtr(pvPages);
+    if (!pvPages)
+        return VINF_SUCCESS;
+
+    SUPFREEPAGE_IN  In;
+
+    In.u32Cookie        = g_u32Cookie;
+    In.u32SessionCookie = g_u32SessionCookie;
+    In.pvR3             = pvPages;
+    return suplibOsIOCtl(SUP_IOCTL_PAGE_FREE, &In, sizeof(In), NULL, 0);
 }