diff options
Diffstat (limited to 'OvmfPkg')
| -rw-r--r-- | OvmfPkg/Include/Library/QemuFwCfgLib.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/OvmfPkg/Include/Library/QemuFwCfgLib.h b/OvmfPkg/Include/Library/QemuFwCfgLib.h index 40a0745..3e017d5 100644 --- a/OvmfPkg/Include/Library/QemuFwCfgLib.h +++ b/OvmfPkg/Include/Library/QemuFwCfgLib.h @@ -24,12 +24,20 @@ #define QEMU_FW_CFG_FNAME_SIZE 56
//
+// If the following bit is set in the UINT32 fw_cfg revision / feature bitmap
+// -- read from key 0x0001 with the basic IO Port or MMIO method --, then the
+// DMA interface is available.
+//
+#define FW_CFG_F_DMA BIT1
+
+//
// Macros for the FW_CFG_DMA_ACCESS.Control bitmap (in native encoding).
//
#define FW_CFG_DMA_CTL_ERROR BIT0
#define FW_CFG_DMA_CTL_READ BIT1
#define FW_CFG_DMA_CTL_SKIP BIT2
#define FW_CFG_DMA_CTL_SELECT BIT3
+#define FW_CFG_DMA_CTL_WRITE BIT4
typedef enum {
QemuFwCfgItemSignature = 0x0000,
|