/** @file\r
\r
- Copyright (c) 2011 - 2012, Intel Corporation. All rights reserved.<BR>\r
+ Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>\r
+ Copyright (C) 2013, Red Hat, Inc.\r
\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
#include <Library/MemoryAllocationLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
\r
-STATIC BOOLEAN mQemuFwCfgSupported = FALSE;\r
-\r
\r
/**\r
Reads an 8-bit I/O port fifo into a block of memory.\r
OUT VOID *Buffer\r
);\r
\r
-\r
/**\r
- Returns a boolean indicating if the firmware configuration interface\r
- is available or not.\r
+ Writes an 8-bit I/O port fifo from a block of memory.\r
+\r
+ Writes the 8-bit I/O fifo port specified by Port.\r
+\r
+ The port is written Count times, and the data are obtained\r
+ from the provided Buffer.\r
\r
- @retval TRUE The interface is available\r
- @retval FALSE The interface is not available\r
+ This function must guarantee that all I/O read and write operations are\r
+ serialized.\r
+\r
+ If 8-bit I/O port operations are not supported, then ASSERT().\r
+\r
+ @param Port The I/O port to read.\r
+ @param Count The number of times to read I/O port.\r
+ @param Buffer The buffer to store the read data into.\r
\r
**/\r
-BOOLEAN\r
+VOID\r
EFIAPI\r
-QemuFwCfgIsAvailable (\r
- VOID\r
- )\r
-{\r
- return mQemuFwCfgSupported;\r
-}\r
+IoWriteFifo8 (\r
+ IN UINTN Port,\r
+ IN UINTN Count,\r
+ OUT VOID *Buffer\r
+ );\r
\r
\r
/**\r
IN VOID *Buffer\r
)\r
{\r
- if (mQemuFwCfgSupported) {\r
+ if (InternalQemuFwCfgIsAvailable ()) {\r
InternalQemuFwCfgReadBytes (Size, Buffer);\r
} else {\r
ZeroMem (Buffer, Size);\r
}\r
}\r
\r
+/**\r
+ Write firmware configuration bytes from a buffer\r
+\r
+ If called multiple times, then the data written will\r
+ continue at the offset of the firmware configuration\r
+ item where the previous write ended.\r
+\r
+ @param[in] Size - Size in bytes to write\r
+ @param[in] Buffer - Buffer to read data from\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+QemuFwCfgWriteBytes (\r
+ IN UINTN Size,\r
+ IN VOID *Buffer\r
+ )\r
+{\r
+ if (InternalQemuFwCfgIsAvailable ()) {\r
+ IoWriteFifo8 (0x511, Size, Buffer);\r
+ }\r
+}\r
+\r
\r
/**\r
Reads a UINT8 firmware configuration value\r
}\r
\r
\r
+/**\r
+ Find the configuration item corresponding to the firmware configuration file.\r
+\r
+ @param[in] Name - Name of file to look up.\r
+ @param[out] Item - Configuration item corresponding to the file, to be passed\r
+ to QemuFwCfgSelectItem ().\r
+ @param[out] Size - Number of bytes in the file.\r
+\r
+ @return RETURN_SUCCESS If file is found.\r
+ RETURN_NOT_FOUND If file is not found.\r
+ RETURN_UNSUPPORTED If firmware configuration is unavailable.\r
+\r
+**/\r
RETURN_STATUS\r
EFIAPI\r
-QemuFwCfgInitialize (\r
- VOID\r
+QemuFwCfgFindFile (\r
+ IN CONST CHAR8 *Name,\r
+ OUT FIRMWARE_CONFIG_ITEM *Item,\r
+ OUT UINTN *Size\r
)\r
{\r
- UINT32 Signature;\r
- UINT32 Revision;\r
-\r
- //\r
- // Enable the access routines while probing to see if it is supported.\r
- //\r
- mQemuFwCfgSupported = TRUE;\r
-\r
- QemuFwCfgSelectItem (QemuFwCfgItemSignature);\r
- Signature = QemuFwCfgRead32 ();\r
- DEBUG ((EFI_D_INFO, "FW CFG Signature: 0x%x\n", Signature));\r
- QemuFwCfgSelectItem (QemuFwCfgItemInterfaceVersion);\r
- Revision = QemuFwCfgRead32 ();\r
- DEBUG ((EFI_D_INFO, "FW CFG Revision: 0x%x\n", Revision));\r
- if ((Signature != SIGNATURE_32 ('Q', 'E', 'M', 'U')) ||\r
- (Revision < 1)\r
- ) {\r
- DEBUG ((EFI_D_INFO, "QemuFwCfg interface not supported.\n"));\r
- mQemuFwCfgSupported = FALSE;\r
- return RETURN_SUCCESS;\r
+ UINT32 Count;\r
+ UINT32 Idx;\r
+\r
+ if (!InternalQemuFwCfgIsAvailable ()) {\r
+ return RETURN_UNSUPPORTED;\r
}\r
\r
- DEBUG ((EFI_D_INFO, "QemuFwCfg interface is supported.\n"));\r
- return RETURN_SUCCESS;\r
+ QemuFwCfgSelectItem (QemuFwCfgItemFileDir);\r
+ Count = SwapBytes32 (QemuFwCfgRead32 ());\r
+\r
+ for (Idx = 0; Idx < Count; ++Idx) {\r
+ UINT32 FileSize;\r
+ UINT16 FileSelect;\r
+ UINT16 FileReserved;\r
+ CHAR8 FName[QEMU_FW_CFG_FNAME_SIZE];\r
+\r
+ FileSize = QemuFwCfgRead32 ();\r
+ FileSelect = QemuFwCfgRead16 ();\r
+ FileReserved = QemuFwCfgRead16 ();\r
+ InternalQemuFwCfgReadBytes (sizeof (FName), FName);\r
+\r
+ if (AsciiStrCmp (Name, FName) == 0) {\r
+ *Item = SwapBytes16 (FileSelect);\r
+ *Size = SwapBytes32 (FileSize);\r
+ return RETURN_SUCCESS;\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
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