diff options
Diffstat (limited to 'ArmVirtPkg')
| -rw-r--r-- | ArmVirtPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c | 42 |
1 files changed, 36 insertions, 6 deletions
diff --git a/ArmVirtPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c b/ArmVirtPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c index 1b19893709..bd0f34720e 100644 --- a/ArmVirtPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c +++ b/ArmVirtPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c @@ -250,26 +250,41 @@ MmioReadBytes ( /**
- Fast READ_BYTES_FUNCTION.
+ Transfer an array of bytes, or skip a number of bytes, using the DMA
+ interface.
+
+ @param[in] Size Size in bytes to transfer or skip.
+
+ @param[in,out] Buffer Buffer to read data into or write data from. Ignored,
+ and may be NULL, if Size is zero, or Control is
+ FW_CFG_DMA_CTL_SKIP.
+
+ @param[in] Control One of the following:
+ FW_CFG_DMA_CTL_WRITE - write to fw_cfg from Buffer.
+ FW_CFG_DMA_CTL_READ - read from fw_cfg into Buffer.
+ FW_CFG_DMA_CTL_SKIP - skip bytes in fw_cfg.
**/
STATIC
VOID
-EFIAPI
-DmaReadBytes (
- IN UINTN Size,
- IN VOID *Buffer OPTIONAL
+DmaTransferBytes (
+ IN UINTN Size,
+ IN OUT VOID *Buffer OPTIONAL,
+ IN UINT32 Control
)
{
volatile FW_CFG_DMA_ACCESS Access;
UINT32 Status;
+ ASSERT (Control == FW_CFG_DMA_CTL_WRITE || Control == FW_CFG_DMA_CTL_READ ||
+ Control == FW_CFG_DMA_CTL_SKIP);
+
if (Size == 0) {
return;
}
ASSERT (Size <= MAX_UINT32);
- Access.Control = SwapBytes32 (FW_CFG_DMA_CTL_READ);
+ Access.Control = SwapBytes32 (Control);
Access.Length = SwapBytes32 ((UINT32)Size);
Access.Address = SwapBytes64 ((UINT64)(UINTN)Buffer);
@@ -305,6 +320,21 @@ DmaReadBytes ( /**
+ Fast READ_BYTES_FUNCTION.
+**/
+STATIC
+VOID
+EFIAPI
+DmaReadBytes (
+ IN UINTN Size,
+ IN VOID *Buffer OPTIONAL
+ )
+{
+ DmaTransferBytes (Size, Buffer, FW_CFG_DMA_CTL_READ);
+}
+
+
+/**
Reads firmware configuration bytes into a buffer
If called multiple times, then the data read will continue at the offset of
|