# HG changeset patch
# User gthomas
# Date 1060370903 0
# Node ID e8588368a458d74d698e976e060750935138d2b5
# Parent  71746e7a1cdcf699ef4f195dff798ef0a01fd954
Add CPU/PCI mapping macro

diff --git a/packages/io/pci/current/ChangeLog b/packages/io/pci/current/ChangeLog
--- a/packages/io/pci/current/ChangeLog
+++ b/packages/io/pci/current/ChangeLog
@@ -1,3 +1,8 @@
+2003-08-08  Gary Thomas  <gary@mind.be>
+
+	* include/pci.h: Add CYGARC_PCI_DMA_ADDRESS() macro - used to
+	map CPU addresses to ones usable by PCI masters.
+
 2003-02-24  Jonathan Larmour  <jifl@eCosCentric.com>
 
 	* cdl/io_pci.cdl: Fix doc link.
diff --git a/packages/io/pci/current/include/pci.h b/packages/io/pci/current/include/pci.h
--- a/packages/io/pci/current/include/pci.h
+++ b/packages/io/pci/current/include/pci.h
@@ -68,6 +68,15 @@
 #include <cyg/io/pci_hw.h>
 
 //------------------------------------------------------------------
+// Map a logical (CPU local) address to one used by a PCI master
+// Normally, this is just the physical address of the object, but
+// it may differ if the platform has different address maps from 
+// the CPU side vs. the PCI side
+#ifndef CYGARC_PCI_DMA_ADDRESS
+#define CYGARC_PCI_DMA_ADDRESS(_x_) CYGARC_PHYSICAL_ADDRESS(_x_)
+#endif
+
+//------------------------------------------------------------------
 // The PCI memory space can span 64 bits, IO space only 32 bits
 typedef CYG_WORD64 CYG_PCI_ADDRESS64;
 typedef CYG_WORD32 CYG_PCI_ADDRESS32;