c6910aeda3
The FileReserved variable in QemuFwCfgFindFile() is only used to skip over the reserved field in file headers, which causes newer versions of GCC to flag it with a "variable set but not used" warning (which is normally not visible since as of right now these warnings are supressed). It's true that the value read into FileReserved is never used, but this is intentional. This patch adds a do-nothing reference to silence the warning. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Bill Paul <wpaul@windriver.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17920 6f19259b-4bc3-4df7-8a09-765794883524
326 lines
7.3 KiB
C
326 lines
7.3 KiB
C
/** @file
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Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>
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Copyright (C) 2013, Red Hat, Inc.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "Uefi.h"
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/IoLib.h>
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#include <Library/QemuFwCfgLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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/**
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Reads an 8-bit I/O port fifo into a block of memory.
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Reads the 8-bit I/O fifo port specified by Port.
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The port is read Count times, and the read data is
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stored in the provided Buffer.
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This function must guarantee that all I/O read and write operations are
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serialized.
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If 8-bit I/O port operations are not supported, then ASSERT().
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@param Port The I/O port to read.
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@param Count The number of times to read I/O port.
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@param Buffer The buffer to store the read data into.
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**/
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VOID
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EFIAPI
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IoReadFifo8 (
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IN UINTN Port,
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IN UINTN Count,
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OUT VOID *Buffer
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);
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/**
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Writes an 8-bit I/O port fifo from a block of memory.
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Writes the 8-bit I/O fifo port specified by Port.
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The port is written Count times, and the data are obtained
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from the provided Buffer.
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This function must guarantee that all I/O read and write operations are
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serialized.
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If 8-bit I/O port operations are not supported, then ASSERT().
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@param Port The I/O port to read.
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@param Count The number of times to read I/O port.
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@param Buffer The buffer to store the read data into.
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**/
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VOID
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EFIAPI
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IoWriteFifo8 (
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IN UINTN Port,
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IN UINTN Count,
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OUT VOID *Buffer
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);
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/**
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Selects a firmware configuration item for reading.
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Following this call, any data read from this item will start from
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the beginning of the configuration item's data.
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@param[in] QemuFwCfgItem - Firmware Configuration item to read
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**/
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VOID
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EFIAPI
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QemuFwCfgSelectItem (
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IN FIRMWARE_CONFIG_ITEM QemuFwCfgItem
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)
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{
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DEBUG ((EFI_D_INFO, "Select Item: 0x%x\n", (UINT16)(UINTN) QemuFwCfgItem));
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IoWrite16 (0x510, (UINT16)(UINTN) QemuFwCfgItem);
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}
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/**
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Reads firmware configuration bytes into a buffer
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@param[in] Size - Size in bytes to read
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@param[in] Buffer - Buffer to store data into (OPTIONAL if Size is 0)
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**/
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VOID
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EFIAPI
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InternalQemuFwCfgReadBytes (
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IN UINTN Size,
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IN VOID *Buffer OPTIONAL
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)
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{
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IoReadFifo8 (0x511, Size, Buffer);
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}
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/**
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Reads firmware configuration bytes into a buffer
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If called multiple times, then the data read will
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continue at the offset of the firmware configuration
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item where the previous read ended.
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@param[in] Size - Size in bytes to read
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@param[in] Buffer - Buffer to store data into
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**/
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VOID
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EFIAPI
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QemuFwCfgReadBytes (
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IN UINTN Size,
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IN VOID *Buffer
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)
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{
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if (InternalQemuFwCfgIsAvailable ()) {
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InternalQemuFwCfgReadBytes (Size, Buffer);
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} else {
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ZeroMem (Buffer, Size);
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}
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}
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/**
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Write firmware configuration bytes from a buffer
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If called multiple times, then the data written will
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continue at the offset of the firmware configuration
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item where the previous write ended.
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@param[in] Size - Size in bytes to write
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@param[in] Buffer - Buffer to read data from
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**/
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VOID
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EFIAPI
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QemuFwCfgWriteBytes (
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IN UINTN Size,
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IN VOID *Buffer
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)
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{
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if (InternalQemuFwCfgIsAvailable ()) {
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IoWriteFifo8 (0x511, Size, Buffer);
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}
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}
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/**
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Reads a UINT8 firmware configuration value
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@return Value of Firmware Configuration item read
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**/
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UINT8
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EFIAPI
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QemuFwCfgRead8 (
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VOID
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)
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{
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UINT8 Result;
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QemuFwCfgReadBytes (sizeof (Result), &Result);
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return Result;
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}
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/**
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Reads a UINT16 firmware configuration value
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@return Value of Firmware Configuration item read
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**/
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UINT16
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EFIAPI
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QemuFwCfgRead16 (
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VOID
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)
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{
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UINT16 Result;
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QemuFwCfgReadBytes (sizeof (Result), &Result);
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return Result;
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}
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/**
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Reads a UINT32 firmware configuration value
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@return Value of Firmware Configuration item read
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**/
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UINT32
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EFIAPI
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QemuFwCfgRead32 (
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VOID
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)
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{
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UINT32 Result;
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QemuFwCfgReadBytes (sizeof (Result), &Result);
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return Result;
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}
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/**
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Reads a UINT64 firmware configuration value
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@return Value of Firmware Configuration item read
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**/
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UINT64
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EFIAPI
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QemuFwCfgRead64 (
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VOID
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)
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{
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UINT64 Result;
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QemuFwCfgReadBytes (sizeof (Result), &Result);
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return Result;
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}
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/**
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Find the configuration item corresponding to the firmware configuration file.
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@param[in] Name - Name of file to look up.
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@param[out] Item - Configuration item corresponding to the file, to be passed
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to QemuFwCfgSelectItem ().
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@param[out] Size - Number of bytes in the file.
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@return RETURN_SUCCESS If file is found.
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RETURN_NOT_FOUND If file is not found.
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RETURN_UNSUPPORTED If firmware configuration is unavailable.
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**/
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RETURN_STATUS
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EFIAPI
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QemuFwCfgFindFile (
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IN CONST CHAR8 *Name,
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OUT FIRMWARE_CONFIG_ITEM *Item,
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OUT UINTN *Size
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)
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{
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UINT32 Count;
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UINT32 Idx;
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if (!InternalQemuFwCfgIsAvailable ()) {
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return RETURN_UNSUPPORTED;
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}
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QemuFwCfgSelectItem (QemuFwCfgItemFileDir);
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Count = SwapBytes32 (QemuFwCfgRead32 ());
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for (Idx = 0; Idx < Count; ++Idx) {
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UINT32 FileSize;
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UINT16 FileSelect;
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UINT16 FileReserved;
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CHAR8 FName[QEMU_FW_CFG_FNAME_SIZE];
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FileSize = QemuFwCfgRead32 ();
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FileSelect = QemuFwCfgRead16 ();
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FileReserved = QemuFwCfgRead16 ();
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(VOID) FileReserved; /* Force a do-nothing reference. */
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InternalQemuFwCfgReadBytes (sizeof (FName), FName);
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if (AsciiStrCmp (Name, FName) == 0) {
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*Item = SwapBytes16 (FileSelect);
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*Size = SwapBytes32 (FileSize);
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return RETURN_SUCCESS;
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}
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}
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return RETURN_NOT_FOUND;
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}
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/**
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Determine if S3 support is explicitly enabled.
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@retval TRUE if S3 support is explicitly enabled.
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FALSE otherwise. This includes unavailability of the firmware
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configuration interface.
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**/
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BOOLEAN
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EFIAPI
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QemuFwCfgS3Enabled (
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VOID
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)
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{
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RETURN_STATUS Status;
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FIRMWARE_CONFIG_ITEM FwCfgItem;
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UINTN FwCfgSize;
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UINT8 SystemStates[6];
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Status = QemuFwCfgFindFile ("etc/system-states", &FwCfgItem, &FwCfgSize);
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if (Status != RETURN_SUCCESS || FwCfgSize != sizeof SystemStates) {
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return FALSE;
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}
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QemuFwCfgSelectItem (FwCfgItem);
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QemuFwCfgReadBytes (sizeof SystemStates, SystemStates);
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return (BOOLEAN) (SystemStates[3] & BIT7);
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}
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