OvmfPkg/QemuFwCfgLib: extend lib class header with more definitions

[mirror_edk2.git] / OvmfPkg / Include / Library / QemuFwCfgLib.h

diff --git a/OvmfPkg/Include/Library/QemuFwCfgLib.h b/OvmfPkg/Include/Library/QemuFwCfgLib.h
index 40a07456c5308ebc699cf9eddad8485ea0919368..3e017d53a97eacb05db39dae6cf9d73752688831 100644 (file)
--- a/OvmfPkg/Include/Library/QemuFwCfgLib.h
+++ b/OvmfPkg/Include/Library/QemuFwCfgLib.h
@@ -23,6 +23,13 @@
 //\r
 #define QEMU_FW_CFG_FNAME_SIZE 56\r
 \r
+//\r
+// If the following bit is set in the UINT32 fw_cfg revision / feature bitmap\r
+// -- read from key 0x0001 with the basic IO Port or MMIO method --, then the\r
+// DMA interface is available.\r
+//\r
+#define FW_CFG_F_DMA BIT1\r
+\r
 //\r
 // Macros for the FW_CFG_DMA_ACCESS.Control bitmap (in native encoding).\r
 //\r
@@ -30,6 +37,7 @@
 #define FW_CFG_DMA_CTL_READ   BIT1\r
 #define FW_CFG_DMA_CTL_SKIP   BIT2\r
 #define FW_CFG_DMA_CTL_SELECT BIT3\r
+#define FW_CFG_DMA_CTL_WRITE  BIT4\r
 \r
 typedef enum {\r
   QemuFwCfgItemSignature            = 0x0000,\r