Changeset 4413 in vbox for trunk/src/VBox/VMM

Timestamp:

Aug 29, 2007 8:50:19 AM (17 years ago)

Author:

vboxsync

Message:

Added PGMPhysWriteGCPtrSafe & PGMPhysReadGCPtrSafe

File:

• trunk/src/VBox/VMM/VMMAll/PGMAllPhys.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMAll/PGMAllPhys.cpp

@@ -1549 +1549 @@
 }
 
+/**
+ * Read from guest physical memory referenced by GC pointer.
+ *
+ * This function uses the current CR3/CR0/CR4 of the guest and will
+ * respect access handlers and set accessed bits.
+ *
+ * @returns VBox status.
+ * @param   pVM         VM handle.
+ * @param   pvDst       The destination address.
+ * @param   GCPtrSrc    The source address (GC pointer).
+ * @param   cb          The number of bytes to read.
+ */
+PGMDECL(int) PGMPhysReadGCPtrSafe(PVM pVM, void *pvDst, RTGCPTR GCPtrSrc, size_t cb)
+{
+    /*
+     * Anything to do?
+     */
+    if (!cb)
+        return VINF_SUCCESS;
+
+    LogFlow(("PGMPhysReadGCPtrSafe: %VGv %d\n", GCPtrSrc, cb));
+
+    /*
+     * Optimize reads within a single page.
+     */
+    if (((RTGCUINTPTR)GCPtrSrc & PAGE_OFFSET_MASK) + cb <= PAGE_SIZE)
+    {
+        /* mark the guest page as accessed. */
+        int rc = PGMGstModifyPage(pVM, GCPtrSrc, 1, X86_PTE_A, ~(uint64_t)(X86_PTE_A));
+        AssertRC(rc);
+
+        PGMPhysRead(pVM, GCPtrSrc, pvDst, cb);
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * Page by page.
+     */
+    for (;;)
+    {
+        /* mark the guest page as accessed. */
+        int rc = PGMGstModifyPage(pVM, GCPtrSrc, 1, X86_PTE_A, ~(uint64_t)(X86_PTE_A));
+        AssertRC(rc);
+
+        /* copy */
+        size_t cbRead = PAGE_SIZE - ((RTGCUINTPTR)GCPtrSrc & PAGE_OFFSET_MASK);
+        if (cbRead >= cb)
+        {
+            PGMPhysRead(pVM, GCPtrSrc, pvDst, cb);
+            return VINF_SUCCESS;
+        }
+        PGMPhysRead(pVM, GCPtrSrc, pvDst, cbRead);
+
+        /* next */
+        cb         -= cbRead;
+        pvDst       = (uint8_t *)pvDst + cbRead;
+        GCPtrSrc   += cbRead;
+    }
+}
+
+
+/**
+ * Write to guest physical memory referenced by GC pointer.
+ *
+ * This function uses the current CR3/CR0/CR4 of the guest and will
+ * respect access handlers and set dirty and accessed bits.
+ *
+ * @returns VBox status.
+ * @param   pVM         VM handle.
+ * @param   GCPtrDst    The destination address (GC pointer).
+ * @param   pvSrc       The source address.
+ * @param   cb          The number of bytes to write.
+ */
+PGMDECL(int) PGMPhysWriteGCPtrSafe(PVM pVM, RTGCPTR GCPtrDst, const void *pvSrc, size_t cb)
+{
+    /*
+     * Anything to do?
+     */
+    if (!cb)
+        return VINF_SUCCESS;
+
+    LogFlow(("PGMPhysWriteGCPtrSafe: %VGv %d\n", GCPtrDst, cb));
+
+    /*
+     * Optimize writes within a single page.
+     */
+    if (((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK) + cb <= PAGE_SIZE)
+    {
+        /* mark the guest page as accessed and dirty. */
+        int rc = PGMGstModifyPage(pVM, GCPtrDst, 1, X86_PTE_A | X86_PTE_D, ~(uint64_t)(X86_PTE_A | X86_PTE_D));
+        AssertRC(rc);
+
+        PGMPhysWrite(pVM, GCPtrDst, pvSrc, cb);
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * Page by page.
+     */
+    for (;;)
+    {
+        /* mark the guest page as accessed and dirty. */
+        int rc = PGMGstModifyPage(pVM, GCPtrDst, 1, X86_PTE_A | X86_PTE_D, ~(uint64_t)(X86_PTE_A | X86_PTE_D));
+        AssertRC(rc);
+
+        /* copy */
+        size_t cbWrite = PAGE_SIZE - ((RTGCUINTPTR)GCPtrDst & PAGE_OFFSET_MASK);
+        if (cbWrite >= cb)
+        {
+            PGMPhysWrite(pVM, GCPtrDst, pvSrc, cb);
+            return VINF_SUCCESS;
+        }
+        PGMPhysWrite(pVM, GCPtrDst, pvSrc, cbWrite);
+
+        /* next */
+        cb         -= cbWrite;
+        pvSrc       = (uint8_t *)pvSrc + cbWrite;
+        GCPtrDst   += cbWrite;
+    }
+}
 
 /**