)\r
{\r
DEBUG ((EFI_D_INFO, "Select Item: 0x%x\n", (UINT16)(UINTN) QemuFwCfgItem));\r
- IoWrite16 (0x510, (UINT16)(UINTN) QemuFwCfgItem);\r
+ IoWrite16 (FW_CFG_IO_SELECTOR, (UINT16)(UINTN) QemuFwCfgItem);\r
}\r
\r
\r
/**\r
- Transfer an array of bytes using the DMA interface.\r
+ Transfer an array of bytes, or skip a number of bytes, using the DMA\r
+ interface.\r
\r
- @param[in] Size Size in bytes to transfer.\r
- @param[in,out] Buffer Buffer to read data into or write data from. May be\r
- NULL if Size is zero.\r
- @param[in] Write TRUE if writing to fw_cfg from Buffer, FALSE if\r
- reading from fw_cfg into Buffer.\r
+ @param[in] Size Size in bytes to transfer or skip.\r
+\r
+ @param[in,out] Buffer Buffer to read data into or write data from. Ignored,\r
+ and may be NULL, if Size is zero, or Control is\r
+ FW_CFG_DMA_CTL_SKIP.\r
+\r
+ @param[in] Control One of the following:\r
+ FW_CFG_DMA_CTL_WRITE - write to fw_cfg from Buffer.\r
+ FW_CFG_DMA_CTL_READ - read from fw_cfg into Buffer.\r
+ FW_CFG_DMA_CTL_SKIP - skip bytes in fw_cfg.\r
**/\r
VOID\r
InternalQemuFwCfgDmaBytes (\r
IN UINT32 Size,\r
IN OUT VOID *Buffer OPTIONAL,\r
- IN BOOLEAN Write\r
+ IN UINT32 Control\r
)\r
{\r
- volatile FW_CFG_DMA_ACCESS Access;\r
+ volatile FW_CFG_DMA_ACCESS LocalAccess;\r
+ volatile FW_CFG_DMA_ACCESS *Access;\r
UINT32 AccessHigh, AccessLow;\r
UINT32 Status;\r
+ UINT32 NumPages;\r
+ VOID *DmaBuffer, *BounceBuffer;\r
+\r
+ ASSERT (Control == FW_CFG_DMA_CTL_WRITE || Control == FW_CFG_DMA_CTL_READ ||\r
+ Control == FW_CFG_DMA_CTL_SKIP);\r
\r
if (Size == 0) {\r
return;\r
}\r
\r
- Access.Control = SwapBytes32 (\r
- Write ? FW_CFG_DMA_CTL_WRITE : FW_CFG_DMA_CTL_READ\r
- );\r
- Access.Length = SwapBytes32 (Size);\r
- Access.Address = SwapBytes64 ((UINTN)Buffer);\r
+ //\r
+ // When SEV is enabled then allocate DMA bounce buffer\r
+ //\r
+ if (InternalQemuFwCfgSevIsEnabled ()) {\r
+ UINTN TotalSize;\r
+\r
+ TotalSize = sizeof (*Access);\r
+ //\r
+ // Skip operation does not need buffer\r
+ //\r
+ if (Control != FW_CFG_DMA_CTL_SKIP) {\r
+ TotalSize += Size;\r
+ }\r
+\r
+ //\r
+ // Allocate SEV DMA buffer\r
+ //\r
+ NumPages = (UINT32)EFI_SIZE_TO_PAGES (TotalSize);\r
+ InternalQemuFwCfgSevDmaAllocateBuffer (&BounceBuffer, NumPages);\r
+\r
+ Access = BounceBuffer;\r
+ DmaBuffer = (UINT8*)BounceBuffer + sizeof (*Access);\r
+\r
+ //\r
+ // Decrypt data from encrypted guest buffer into DMA buffer\r
+ //\r
+ if (Control == FW_CFG_DMA_CTL_WRITE) {\r
+ CopyMem (DmaBuffer, Buffer, Size);\r
+ }\r
+ } else {\r
+ Access = &LocalAccess;\r
+ DmaBuffer = Buffer;\r
+ BounceBuffer = NULL;\r
+ }\r
+\r
+ Access->Control = SwapBytes32 (Control);\r
+ Access->Length = SwapBytes32 (Size);\r
+ Access->Address = SwapBytes64 ((UINTN)DmaBuffer);\r
\r
//\r
// Delimit the transfer from (a) modifications to Access, (b) in case of a\r
//\r
// Start the transfer.\r
//\r
- AccessHigh = (UINT32)RShiftU64 ((UINTN)&Access, 32);\r
- AccessLow = (UINT32)(UINTN)&Access;\r
- IoWrite32 (0x514, SwapBytes32 (AccessHigh));\r
- IoWrite32 (0x518, SwapBytes32 (AccessLow));\r
+ AccessHigh = (UINT32)RShiftU64 ((UINTN)Access, 32);\r
+ AccessLow = (UINT32)(UINTN)Access;\r
+ IoWrite32 (FW_CFG_IO_DMA_ADDRESS, SwapBytes32 (AccessHigh));\r
+ IoWrite32 (FW_CFG_IO_DMA_ADDRESS + 4, SwapBytes32 (AccessLow));\r
\r
//\r
// Don't look at Access.Control before starting the transfer.\r
// Wait for the transfer to complete.\r
//\r
do {\r
- Status = SwapBytes32 (Access.Control);\r
+ Status = SwapBytes32 (Access->Control);\r
ASSERT ((Status & FW_CFG_DMA_CTL_ERROR) == 0);\r
} while (Status != 0);\r
\r
// After a read, the caller will want to use Buffer.\r
//\r
MemoryFence ();\r
+\r
+ //\r
+ // If Bounce buffer was allocated then copy the data into guest buffer and\r
+ // free the bounce buffer\r
+ //\r
+ if (BounceBuffer != NULL) {\r
+ //\r
+ // Encrypt the data from DMA buffer into guest buffer\r
+ //\r
+ if (Control == FW_CFG_DMA_CTL_READ) {\r
+ CopyMem (Buffer, DmaBuffer, Size);\r
+ }\r
+\r
+ InternalQemuFwCfgSevDmaFreeBuffer (BounceBuffer, NumPages);\r
+ }\r
}\r
\r
\r
)\r
{\r
if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {\r
- InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, FALSE);\r
+ InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, FW_CFG_DMA_CTL_READ);\r
return;\r
}\r
- IoReadFifo8 (0x511, Size, Buffer);\r
+ IoReadFifo8 (FW_CFG_IO_DATA, Size, Buffer);\r
}\r
\r
\r
{\r
if (InternalQemuFwCfgIsAvailable ()) {\r
if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {\r
- InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, TRUE);\r
+ InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, FW_CFG_DMA_CTL_WRITE);\r
return;\r
}\r
- IoWriteFifo8 (0x511, Size, Buffer);\r
+ IoWriteFifo8 (FW_CFG_IO_DATA, Size, Buffer);\r
+ }\r
+}\r
+\r
+\r
+/**\r
+ Skip bytes in the firmware configuration item.\r
+\r
+ Increase the offset of the firmware configuration item without transferring\r
+ bytes between the item and a caller-provided buffer. Subsequent read, write\r
+ or skip operations will commence at the increased offset.\r
+\r
+ @param[in] Size Number of bytes to skip.\r
+**/\r
+VOID\r
+EFIAPI\r
+QemuFwCfgSkipBytes (\r
+ IN UINTN Size\r
+ )\r
+{\r
+ UINTN ChunkSize;\r
+ UINT8 SkipBuffer[256];\r
+\r
+ if (!InternalQemuFwCfgIsAvailable ()) {\r
+ return;\r
+ }\r
+\r
+ if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {\r
+ InternalQemuFwCfgDmaBytes ((UINT32)Size, NULL, FW_CFG_DMA_CTL_SKIP);\r
+ return;\r
+ }\r
+\r
+ //\r
+ // Emulate the skip by reading data in chunks, and throwing it away. The\r
+ // implementation below is suitable even for phases where RAM or dynamic\r
+ // allocation is not available or appropriate. It also doesn't affect the\r
+ // static data footprint for client modules. Large skips are not expected,\r
+ // therefore this fallback is not performance critical. The size of\r
+ // SkipBuffer is thought not to exert a large pressure on the stack in any\r
+ // phase.\r
+ //\r
+ while (Size > 0) {\r
+ ChunkSize = MIN (Size, sizeof SkipBuffer);\r
+ IoReadFifo8 (FW_CFG_IO_DATA, ChunkSize, SkipBuffer);\r
+ Size -= ChunkSize;\r
}\r
}\r
\r
\r
return RETURN_NOT_FOUND;\r
}\r
-\r
-\r
-/**\r
- Determine if S3 support is explicitly enabled.\r
-\r
- @retval TRUE if S3 support is explicitly enabled.\r
- FALSE otherwise. This includes unavailability of the firmware\r
- configuration interface.\r
-**/\r
-BOOLEAN\r
-EFIAPI\r
-QemuFwCfgS3Enabled (\r
- VOID\r
- )\r
-{\r
- RETURN_STATUS Status;\r
- FIRMWARE_CONFIG_ITEM FwCfgItem;\r
- UINTN FwCfgSize;\r
- UINT8 SystemStates[6];\r
-\r
- Status = QemuFwCfgFindFile ("etc/system-states", &FwCfgItem, &FwCfgSize);\r
- if (Status != RETURN_SUCCESS || FwCfgSize != sizeof SystemStates) {\r
- return FALSE;\r
- }\r
- QemuFwCfgSelectItem (FwCfgItem);\r
- QemuFwCfgReadBytes (sizeof SystemStates, SystemStates);\r
- return (BOOLEAN) (SystemStates[3] & BIT7);\r
-}\r
projects / mirror_edk2.git / blobdiff