/** @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
+ Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\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
-\r
- Reads the 8-bit I/O fifo port specified by Port.\r
-\r
- The port is read Count times, and the read data is\r
- stored in the provided Buffer.\r
-\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
-VOID\r
-EFIAPI\r
-IoReadFifo8 (\r
- IN UINTN Port,\r
- IN UINTN Count,\r
- OUT VOID *Buffer\r
- );\r
-\r
-\r
-/**\r
- Returns a boolean indicating if the firmware configuration interface\r
- is available or not.\r
-\r
- @retval TRUE The interface is available\r
- @retval FALSE The interface is not available\r
-\r
-**/\r
-BOOLEAN\r
-EFIAPI\r
-QemuFwCfgIsAvailable (\r
- VOID\r
- )\r
-{\r
- return mQemuFwCfgSupported;\r
-}\r
+#include "QemuFwCfgLibInternal.h"\r
\r
\r
/**\r
}\r
\r
\r
+/**\r
+ Transfer an array of bytes using the DMA 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
+**/\r
+VOID\r
+InternalQemuFwCfgDmaBytes (\r
+ IN UINT32 Size,\r
+ IN OUT VOID *Buffer OPTIONAL,\r
+ IN BOOLEAN Write\r
+ )\r
+{\r
+ volatile FW_CFG_DMA_ACCESS Access;\r
+ UINT32 AccessHigh, AccessLow;\r
+ UINT32 Status;\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
+ //\r
+ // Delimit the transfer from (a) modifications to Access, (b) in case of a\r
+ // write, from writes to Buffer by the caller.\r
+ //\r
+ MemoryFence ();\r
+\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
+\r
+ //\r
+ // Don't look at Access.Control before starting the transfer.\r
+ //\r
+ MemoryFence ();\r
+\r
+ //\r
+ // Wait for the transfer to complete.\r
+ //\r
+ do {\r
+ Status = SwapBytes32 (Access.Control);\r
+ ASSERT ((Status & FW_CFG_DMA_CTL_ERROR) == 0);\r
+ } while (Status != 0);\r
+\r
+ //\r
+ // After a read, the caller will want to use Buffer.\r
+ //\r
+ MemoryFence ();\r
+}\r
+\r
+\r
/**\r
Reads firmware configuration bytes into a buffer\r
\r
IN VOID *Buffer OPTIONAL\r
)\r
{\r
+ if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {\r
+ InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, FALSE);\r
+ return;\r
+ }\r
IoReadFifo8 (0x511, Size, Buffer);\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
+ if (InternalQemuFwCfgDmaIsAvailable () && Size <= MAX_UINT32) {\r
+ InternalQemuFwCfgDmaBytes ((UINT32)Size, Buffer, TRUE);\r
+ return;\r
+ }\r
+ IoWriteFifo8 (0x511, Size, Buffer);\r
+ }\r
+}\r
+\r
\r
/**\r
Reads a UINT8 firmware configuration value\r
}\r
\r
\r
-RETURN_STATUS\r
-EFIAPI\r
-QemuFwCfgInitialize (\r
- VOID\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
- }\r
-\r
- DEBUG ((EFI_D_INFO, "QemuFwCfg interface is supported.\n"));\r
- return RETURN_SUCCESS;\r
-}\r
-\r
-\r
/**\r
Find the configuration item corresponding to the firmware configuration file.\r
\r
UINT32 Count;\r
UINT32 Idx;\r
\r
- if (!mQemuFwCfgSupported) {\r
+ if (!InternalQemuFwCfgIsAvailable ()) {\r
return RETURN_UNSUPPORTED;\r
}\r
\r
UINT32 FileSize;\r
UINT16 FileSelect;\r
UINT16 FileReserved;\r
- CHAR8 FName[56];\r
+ CHAR8 FName[QEMU_FW_CFG_FNAME_SIZE];\r
\r
FileSize = QemuFwCfgRead32 ();\r
FileSelect = QemuFwCfgRead16 ();\r
FileReserved = QemuFwCfgRead16 ();\r
+ (VOID) FileReserved; /* Force a do-nothing reference. */\r
InternalQemuFwCfgReadBytes (sizeof (FName), FName);\r
\r
if (AsciiStrCmp (Name, FName) == 0) {\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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