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CloverBootloader/OvmfPkg/Library/QemuFwCfgS3Lib/QemuFwCfgS3Dxe.c

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/** @file
Full functionality QemuFwCfgS3Lib instance, for DXE phase modules.
Copyright (C) 2017, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/QemuFwCfgLib.h>
#include <Library/QemuFwCfgS3Lib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/S3SaveState.h>
//
// Event to signal when the S3SaveState protocol interface is installed.
//
STATIC EFI_EVENT mS3SaveStateInstalledEvent;
//
// Reference to the S3SaveState protocol interface, after it is installed.
//
STATIC EFI_S3_SAVE_STATE_PROTOCOL *mS3SaveState;
//
// The control structure is allocated in reserved memory, aligned at 8 bytes.
// The client-requested ScratchBuffer will be allocated adjacently, also
// aligned at 8 bytes.
//
#define RESERVED_MEM_ALIGNMENT 8
STATIC FW_CFG_DMA_ACCESS *mDmaAccess;
STATIC VOID *mScratchBuffer;
STATIC UINTN mScratchBufferSize;
//
// Callback provided by the client, for appending ACPI S3 Boot Script opcodes.
// To be called from S3SaveStateInstalledNotify().
//
STATIC FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION *mCallback;
/**
Event notification function for mS3SaveStateInstalledEvent.
**/
STATIC
VOID
EFIAPI
S3SaveStateInstalledNotify (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
ASSERT (Event == mS3SaveStateInstalledEvent);
Status = gBS->LocateProtocol (
&gEfiS3SaveStateProtocolGuid,
NULL /* Registration */,
(VOID **)&mS3SaveState
);
if (EFI_ERROR (Status)) {
return;
}
ASSERT (mCallback != NULL);
DEBUG ((
DEBUG_INFO,
"%a: %a: DmaAccess@0x%Lx ScratchBuffer@[0x%Lx+0x%Lx]\n",
gEfiCallerBaseName,
__func__,
(UINT64)(UINTN)mDmaAccess,
(UINT64)(UINTN)mScratchBuffer,
(UINT64)mScratchBufferSize
));
mCallback (Context, mScratchBuffer);
gBS->CloseEvent (mS3SaveStateInstalledEvent);
mS3SaveStateInstalledEvent = NULL;
}
/**
Install the client module's FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION callback for
when the production of ACPI S3 Boot Script opcodes becomes possible.
Take ownership of the client-provided Context, and pass it to the callback
function, when the latter is invoked.
Allocate scratch space for those ACPI S3 Boot Script opcodes to work upon
that the client will produce in the callback function.
@param[in] Callback FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION to invoke
when the production of ACPI S3 Boot Script
opcodes becomes possible. Callback() may be
called immediately from
QemuFwCfgS3CallWhenBootScriptReady().
@param[in,out] Context Client-provided data structure for the
Callback() callback function to consume.
If Context points to dynamically allocated
memory, then Callback() must release it.
If Context points to dynamically allocated
memory, and
QemuFwCfgS3CallWhenBootScriptReady() returns
successfully, then the caller of
QemuFwCfgS3CallWhenBootScriptReady() must
neither dereference nor even evaluate Context
any longer, as ownership of the referenced area
has been transferred to Callback().
@param[in] ScratchBufferSize The size of the scratch buffer that will hold,
in reserved memory, all client data read,
written, and checked by the ACPI S3 Boot Script
opcodes produced by Callback().
@retval RETURN_UNSUPPORTED The library instance does not support this
function.
@retval RETURN_NOT_FOUND The fw_cfg DMA interface to QEMU is
unavailable.
@retval RETURN_BAD_BUFFER_SIZE ScratchBufferSize is too large.
@retval RETURN_OUT_OF_RESOURCES Memory allocation failed.
@retval RETURN_SUCCESS Callback() has been installed, and the
ownership of Context has been transferred.
Reserved memory has been allocated for the
scratch buffer.
A successful invocation of
QemuFwCfgS3CallWhenBootScriptReady() cannot
be rolled back.
@return Error codes from underlying functions.
**/
RETURN_STATUS
EFIAPI
QemuFwCfgS3CallWhenBootScriptReady (
IN FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION *Callback,
IN OUT VOID *Context OPTIONAL,
IN UINTN ScratchBufferSize
)
{
EFI_STATUS Status;
VOID *Registration;
//
// Basic fw_cfg is certainly available, as we can only be here after a
// successful call to QemuFwCfgS3Enabled(). Check fw_cfg DMA availability.
//
ASSERT (QemuFwCfgIsAvailable ());
QemuFwCfgSelectItem (QemuFwCfgItemInterfaceVersion);
if ((QemuFwCfgRead32 () & FW_CFG_F_DMA) == 0) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: fw_cfg DMA unavailable\n",
gEfiCallerBaseName,
__func__
));
return RETURN_NOT_FOUND;
}
//
// Allocate a reserved buffer for the DMA access control structure and the
// client data together.
//
if (ScratchBufferSize >
MAX_UINT32 - (RESERVED_MEM_ALIGNMENT - 1) - sizeof *mDmaAccess)
{
DEBUG ((
DEBUG_ERROR,
"%a: %a: ScratchBufferSize too big: %Lu\n",
gEfiCallerBaseName,
__func__,
(UINT64)ScratchBufferSize
));
return RETURN_BAD_BUFFER_SIZE;
}
mDmaAccess = AllocateReservedPool (
(RESERVED_MEM_ALIGNMENT - 1) +
sizeof *mDmaAccess + ScratchBufferSize
);
if (mDmaAccess == NULL) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: AllocateReservedPool(): out of resources\n",
gEfiCallerBaseName,
__func__
));
return RETURN_OUT_OF_RESOURCES;
}
mDmaAccess = ALIGN_POINTER (mDmaAccess, RESERVED_MEM_ALIGNMENT);
//
// Set up a protocol notify for EFI_S3_SAVE_STATE_PROTOCOL. Forward the
// client's Context to the callback.
//
Status = gBS->CreateEvent (
EVT_NOTIFY_SIGNAL,
TPL_CALLBACK,
S3SaveStateInstalledNotify,
Context,
&mS3SaveStateInstalledEvent
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: CreateEvent(): %r\n",
gEfiCallerBaseName,
__func__,
Status
));
goto FreeDmaAccess;
}
Status = gBS->RegisterProtocolNotify (
&gEfiS3SaveStateProtocolGuid,
mS3SaveStateInstalledEvent,
&Registration
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: RegisterProtocolNotify(): %r\n",
gEfiCallerBaseName,
__func__,
Status
));
goto CloseEvent;
}
//
// Set the remaining global variables. For the alignment guarantee on
// mScratchBuffer, we rely on the fact that *mDmaAccess has a size that is an
// integral multiple of RESERVED_MEM_ALIGNMENT.
//
ASSERT (sizeof *mDmaAccess % RESERVED_MEM_ALIGNMENT == 0);
mScratchBuffer = mDmaAccess + 1;
mScratchBufferSize = ScratchBufferSize;
mCallback = Callback;
//
// Kick the event; EFI_S3_SAVE_STATE_PROTOCOL could be available already.
//
Status = gBS->SignalEvent (mS3SaveStateInstalledEvent);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: SignalEvent(): %r\n",
gEfiCallerBaseName,
__func__,
Status
));
goto NullGlobals;
}
return RETURN_SUCCESS;
NullGlobals:
mScratchBuffer = NULL;
mScratchBufferSize = 0;
mCallback = NULL;
CloseEvent:
gBS->CloseEvent (mS3SaveStateInstalledEvent);
mS3SaveStateInstalledEvent = NULL;
FreeDmaAccess:
FreePool (mDmaAccess);
mDmaAccess = NULL;
return (RETURN_STATUS)Status;
}
/**
Produce ACPI S3 Boot Script opcodes that (optionally) select an fw_cfg item,
and transfer data to it.
The opcodes produced by QemuFwCfgS3ScriptWriteBytes() will first restore
NumberOfBytes bytes in ScratchBuffer in-place, in reserved memory, then write
them to fw_cfg using DMA.
If the operation fails during S3 resume, the boot script will hang.
This function may only be called from the client module's
FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION, which was passed to
QemuFwCfgS3CallWhenBootScriptReady() as Callback.
@param[in] FirmwareConfigItem The UINT16 selector key of the firmware config
item to write, expressed as INT32. If
FirmwareConfigItem is -1, no selection is
made, the write will occur to the currently
selected item, at its currently selected
offset. Otherwise, the specified item will be
selected, and the write will occur at offset
0.
@param[in] NumberOfBytes Size of the data to restore in ScratchBuffer,
and to write from ScratchBuffer, during S3
resume. NumberOfBytes must not exceed
ScratchBufferSize, which was passed to
QemuFwCfgS3CallWhenBootScriptReady().
@retval RETURN_SUCCESS The opcodes were appended to the ACPI S3
Boot Script successfully. There is no way
to undo this action.
@retval RETURN_INVALID_PARAMETER FirmwareConfigItem is invalid.
@retval RETURN_BAD_BUFFER_SIZE NumberOfBytes is larger than
ScratchBufferSize.
@return Error codes from underlying functions.
**/
RETURN_STATUS
EFIAPI
QemuFwCfgS3ScriptWriteBytes (
IN INT32 FirmwareConfigItem,
IN UINTN NumberOfBytes
)
{
UINTN Count;
EFI_STATUS Status;
UINT64 AccessAddress;
UINT32 ControlPollData;
UINT32 ControlPollMask;
ASSERT (mDmaAccess != NULL);
ASSERT (mS3SaveState != NULL);
if ((FirmwareConfigItem < -1) || (FirmwareConfigItem > MAX_UINT16)) {
return RETURN_INVALID_PARAMETER;
}
if (NumberOfBytes > mScratchBufferSize) {
return RETURN_BAD_BUFFER_SIZE;
}
//
// Set up a write[+select] fw_cfg DMA command.
//
mDmaAccess->Control = FW_CFG_DMA_CTL_WRITE;
if (FirmwareConfigItem != -1) {
mDmaAccess->Control |= FW_CFG_DMA_CTL_SELECT;
mDmaAccess->Control |= (UINT32)FirmwareConfigItem << 16;
}
mDmaAccess->Control = SwapBytes32 (mDmaAccess->Control);
//
// We ensured the following constraint via mScratchBufferSize in
// QemuFwCfgS3CallWhenBootScriptReady().
//
ASSERT (NumberOfBytes <= MAX_UINT32);
mDmaAccess->Length = SwapBytes32 ((UINT32)NumberOfBytes);
mDmaAccess->Address = SwapBytes64 ((UINTN)mScratchBuffer);
//
// Copy mDmaAccess and NumberOfBytes bytes from mScratchBuffer into the boot
// script. When executed at S3 resume, this opcode will restore all of them
// in-place.
//
Count = (UINTN)mScratchBuffer + NumberOfBytes - (UINTN)mDmaAccess;
Status = mS3SaveState->Write (
mS3SaveState, // This
EFI_BOOT_SCRIPT_MEM_WRITE_OPCODE, // OpCode
EfiBootScriptWidthUint8, // Width
(UINT64)(UINTN)mDmaAccess, // Address
Count, // Count
(VOID *)mDmaAccess // Buffer
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: EFI_BOOT_SCRIPT_MEM_WRITE_OPCODE: %r\n",
gEfiCallerBaseName,
__func__,
Status
));
return (RETURN_STATUS)Status;
}
//
// Append an opcode that will write the address of the fw_cfg DMA command to
// the fw_cfg DMA address register, which consists of two 32-bit IO ports.
// The second (highest address, least significant) write will start the
// transfer.
//
AccessAddress = SwapBytes64 ((UINTN)mDmaAccess);
Status = mS3SaveState->Write (
mS3SaveState, // This
EFI_BOOT_SCRIPT_IO_WRITE_OPCODE, // OpCode
EfiBootScriptWidthUint32, // Width
(UINT64)FW_CFG_IO_DMA_ADDRESS, // Address
(UINTN)2, // Count
(VOID *)&AccessAddress // Buffer
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: EFI_BOOT_SCRIPT_IO_WRITE_OPCODE: %r\n",
gEfiCallerBaseName,
__func__,
Status
));
return (RETURN_STATUS)Status;
}
//
// The following opcode will wait until the Control word reads as zero
// (transfer complete). As timeout we use MAX_UINT64 * 100ns, which is
// approximately 58494 years.
//
ControlPollData = 0;
ControlPollMask = MAX_UINT32;
Status = mS3SaveState->Write (
mS3SaveState, // This
EFI_BOOT_SCRIPT_MEM_POLL_OPCODE, // OpCode
EfiBootScriptWidthUint32, // Width
(UINT64)(UINTN)&mDmaAccess->Control, // Address
(VOID *)&ControlPollData, // Data
(VOID *)&ControlPollMask, // DataMask
MAX_UINT64 // Delay
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: EFI_BOOT_SCRIPT_MEM_POLL_OPCODE: %r\n",
gEfiCallerBaseName,
__func__,
Status
));
return (RETURN_STATUS)Status;
}
return RETURN_SUCCESS;
}
/**
Produce ACPI S3 Boot Script opcodes that (optionally) select an fw_cfg item,
and transfer data from it.
The opcodes produced by QemuFwCfgS3ScriptReadBytes() will read NumberOfBytes
bytes from fw_cfg using DMA, storing the result in ScratchBuffer, in reserved
memory.
If the operation fails during S3 resume, the boot script will hang.
This function may only be called from the client module's
FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION, which was passed to
QemuFwCfgS3CallWhenBootScriptReady() as Callback.
@param[in] FirmwareConfigItem The UINT16 selector key of the firmware config
item to read, expressed as INT32. If
FirmwareConfigItem is -1, no selection is
made, the read will occur from the currently
selected item, from its currently selected
offset. Otherwise, the specified item will be
selected, and the read will occur from offset
0.
@param[in] NumberOfBytes Size of the data to read during S3 resume.
NumberOfBytes must not exceed
ScratchBufferSize, which was passed to
QemuFwCfgS3CallWhenBootScriptReady().
@retval RETURN_SUCCESS The opcodes were appended to the ACPI S3
Boot Script successfully. There is no way
to undo this action.
@retval RETURN_INVALID_PARAMETER FirmwareConfigItem is invalid.
@retval RETURN_BAD_BUFFER_SIZE NumberOfBytes is larger than
ScratchBufferSize.
@return Error codes from underlying functions.
**/
RETURN_STATUS
EFIAPI
QemuFwCfgS3ScriptReadBytes (
IN INT32 FirmwareConfigItem,
IN UINTN NumberOfBytes
)
{
EFI_STATUS Status;
UINT64 AccessAddress;
UINT32 ControlPollData;
UINT32 ControlPollMask;
ASSERT (mDmaAccess != NULL);
ASSERT (mS3SaveState != NULL);
if ((FirmwareConfigItem < -1) || (FirmwareConfigItem > MAX_UINT16)) {
return RETURN_INVALID_PARAMETER;
}
if (NumberOfBytes > mScratchBufferSize) {
return RETURN_BAD_BUFFER_SIZE;
}
//
// Set up a read[+select] fw_cfg DMA command.
//
mDmaAccess->Control = FW_CFG_DMA_CTL_READ;
if (FirmwareConfigItem != -1) {
mDmaAccess->Control |= FW_CFG_DMA_CTL_SELECT;
mDmaAccess->Control |= (UINT32)FirmwareConfigItem << 16;
}
mDmaAccess->Control = SwapBytes32 (mDmaAccess->Control);
//
// We ensured the following constraint via mScratchBufferSize in
// QemuFwCfgS3CallWhenBootScriptReady().
//
ASSERT (NumberOfBytes <= MAX_UINT32);
mDmaAccess->Length = SwapBytes32 ((UINT32)NumberOfBytes);
mDmaAccess->Address = SwapBytes64 ((UINTN)mScratchBuffer);
//
// Copy mDmaAccess into the boot script. When executed at S3 resume, this
// opcode will restore it in-place.
//
Status = mS3SaveState->Write (
mS3SaveState, // This
EFI_BOOT_SCRIPT_MEM_WRITE_OPCODE, // OpCode
EfiBootScriptWidthUint8, // Width
(UINT64)(UINTN)mDmaAccess, // Address
sizeof *mDmaAccess, // Count
(VOID *)mDmaAccess // Buffer
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: EFI_BOOT_SCRIPT_MEM_WRITE_OPCODE: %r\n",
gEfiCallerBaseName,
__func__,
Status
));
return (RETURN_STATUS)Status;
}
//
// Append an opcode that will write the address of the fw_cfg DMA command to
// the fw_cfg DMA address register, which consists of two 32-bit IO ports.
// The second (highest address, least significant) write will start the
// transfer.
//
AccessAddress = SwapBytes64 ((UINTN)mDmaAccess);
Status = mS3SaveState->Write (
mS3SaveState, // This
EFI_BOOT_SCRIPT_IO_WRITE_OPCODE, // OpCode
EfiBootScriptWidthUint32, // Width
(UINT64)FW_CFG_IO_DMA_ADDRESS, // Address
(UINTN)2, // Count
(VOID *)&AccessAddress // Buffer
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: EFI_BOOT_SCRIPT_IO_WRITE_OPCODE: %r\n",
gEfiCallerBaseName,
__func__,
Status
));
return (RETURN_STATUS)Status;
}
//
// The following opcode will wait until the Control word reads as zero
// (transfer complete). As timeout we use MAX_UINT64 * 100ns, which is
// approximately 58494 years.
//
ControlPollData = 0;
ControlPollMask = MAX_UINT32;
Status = mS3SaveState->Write (
mS3SaveState, // This
EFI_BOOT_SCRIPT_MEM_POLL_OPCODE, // OpCode
EfiBootScriptWidthUint32, // Width
(UINT64)(UINTN)&mDmaAccess->Control, // Address
(VOID *)&ControlPollData, // Data
(VOID *)&ControlPollMask, // DataMask
MAX_UINT64 // Delay
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: EFI_BOOT_SCRIPT_MEM_POLL_OPCODE: %r\n",
gEfiCallerBaseName,
__func__,
Status
));
return (RETURN_STATUS)Status;
}
return RETURN_SUCCESS;
}
/**
Produce ACPI S3 Boot Script opcodes that (optionally) select an fw_cfg item,
and increase its offset.
If the operation fails during S3 resume, the boot script will hang.
This function may only be called from the client module's
FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION, which was passed to
QemuFwCfgS3CallWhenBootScriptReady() as Callback.
@param[in] FirmwareConfigItem The UINT16 selector key of the firmware config
item to advance the offset of, expressed as
INT32. If FirmwareConfigItem is -1, no
selection is made, and the offset for the
currently selected item is increased.
Otherwise, the specified item will be
selected, and the offset increment will occur
from offset 0.
@param[in] NumberOfBytes The number of bytes to skip in the subject
fw_cfg item.
@retval RETURN_SUCCESS The opcodes were appended to the ACPI S3
Boot Script successfully. There is no way
to undo this action.
@retval RETURN_INVALID_PARAMETER FirmwareConfigItem is invalid.
@retval RETURN_BAD_BUFFER_SIZE NumberOfBytes is too large.
@return Error codes from underlying functions.
**/
RETURN_STATUS
EFIAPI
QemuFwCfgS3ScriptSkipBytes (
IN INT32 FirmwareConfigItem,
IN UINTN NumberOfBytes
)
{
EFI_STATUS Status;
UINT64 AccessAddress;
UINT32 ControlPollData;
UINT32 ControlPollMask;
ASSERT (mDmaAccess != NULL);
ASSERT (mS3SaveState != NULL);
if ((FirmwareConfigItem < -1) || (FirmwareConfigItem > MAX_UINT16)) {
return RETURN_INVALID_PARAMETER;
}
if (NumberOfBytes > MAX_UINT32) {
return RETURN_BAD_BUFFER_SIZE;
}
//
// Set up a skip[+select] fw_cfg DMA command.
//
mDmaAccess->Control = FW_CFG_DMA_CTL_SKIP;
if (FirmwareConfigItem != -1) {
mDmaAccess->Control |= FW_CFG_DMA_CTL_SELECT;
mDmaAccess->Control |= (UINT32)FirmwareConfigItem << 16;
}
mDmaAccess->Control = SwapBytes32 (mDmaAccess->Control);
mDmaAccess->Length = SwapBytes32 ((UINT32)NumberOfBytes);
mDmaAccess->Address = 0;
//
// Copy mDmaAccess into the boot script. When executed at S3 resume, this
// opcode will restore it in-place.
//
Status = mS3SaveState->Write (
mS3SaveState, // This
EFI_BOOT_SCRIPT_MEM_WRITE_OPCODE, // OpCode
EfiBootScriptWidthUint8, // Width
(UINT64)(UINTN)mDmaAccess, // Address
sizeof *mDmaAccess, // Count
(VOID *)mDmaAccess // Buffer
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: EFI_BOOT_SCRIPT_MEM_WRITE_OPCODE: %r\n",
gEfiCallerBaseName,
__func__,
Status
));
return (RETURN_STATUS)Status;
}
//
// Append an opcode that will write the address of the fw_cfg DMA command to
// the fw_cfg DMA address register, which consists of two 32-bit IO ports.
// The second (highest address, least significant) write will start the
// transfer.
//
AccessAddress = SwapBytes64 ((UINTN)mDmaAccess);
Status = mS3SaveState->Write (
mS3SaveState, // This
EFI_BOOT_SCRIPT_IO_WRITE_OPCODE, // OpCode
EfiBootScriptWidthUint32, // Width
(UINT64)FW_CFG_IO_DMA_ADDRESS, // Address
(UINTN)2, // Count
(VOID *)&AccessAddress // Buffer
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: EFI_BOOT_SCRIPT_IO_WRITE_OPCODE: %r\n",
gEfiCallerBaseName,
__func__,
Status
));
return (RETURN_STATUS)Status;
}
//
// The following opcode will wait until the Control word reads as zero
// (transfer complete). As timeout we use MAX_UINT64 * 100ns, which is
// approximately 58494 years.
//
ControlPollData = 0;
ControlPollMask = MAX_UINT32;
Status = mS3SaveState->Write (
mS3SaveState, // This
EFI_BOOT_SCRIPT_MEM_POLL_OPCODE, // OpCode
EfiBootScriptWidthUint32, // Width
(UINT64)(UINTN)&mDmaAccess->Control, // Address
(VOID *)&ControlPollData, // Data
(VOID *)&ControlPollMask, // DataMask
MAX_UINT64 // Delay
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: EFI_BOOT_SCRIPT_MEM_POLL_OPCODE: %r\n",
gEfiCallerBaseName,
__func__,
Status
));
return (RETURN_STATUS)Status;
}
return RETURN_SUCCESS;
}
/**
Produce ACPI S3 Boot Script opcodes that check a value in ScratchBuffer.
If the check fails during S3 resume, the boot script will hang.
This function may only be called from the client module's
FW_CFG_BOOT_SCRIPT_CALLBACK_FUNCTION, which was passed to
QemuFwCfgS3CallWhenBootScriptReady() as Callback.
@param[in] ScratchData Pointer to the UINT8, UINT16, UINT32 or UINT64 field
in ScratchBuffer that should be checked. The caller
is responsible for populating the field during S3
resume, by calling QemuFwCfgS3ScriptReadBytes() ahead
of QemuFwCfgS3ScriptCheckValue().
ScratchData must point into ScratchBuffer, which was
allocated, and passed to Callback(), by
QemuFwCfgS3CallWhenBootScriptReady().
ScratchData must be aligned at ValueSize bytes.
@param[in] ValueSize One of 1, 2, 4 or 8, specifying the size of the field
to check.
@param[in] ValueMask The value read from ScratchData is binarily AND-ed
with ValueMask, and the result is compared against
Value. If the masked data equals Value, the check
passes, and the boot script can proceed. Otherwise,
the check fails, and the boot script hangs.
@param[in] Value Refer to ValueMask.
@retval RETURN_SUCCESS The opcodes were appended to the ACPI S3
Boot Script successfully. There is no way
to undo this action.
@retval RETURN_INVALID_PARAMETER ValueSize is invalid.
@retval RETURN_INVALID_PARAMETER ValueMask or Value cannot be represented in
ValueSize bytes.
@retval RETURN_INVALID_PARAMETER ScratchData is not aligned at ValueSize
bytes.
@retval RETURN_BAD_BUFFER_SIZE The ValueSize bytes at ScratchData aren't
wholly contained in the ScratchBufferSize
bytes at ScratchBuffer.
@return Error codes from underlying functions.
**/
RETURN_STATUS
EFIAPI
QemuFwCfgS3ScriptCheckValue (
IN VOID *ScratchData,
IN UINT8 ValueSize,
IN UINT64 ValueMask,
IN UINT64 Value
)
{
EFI_BOOT_SCRIPT_WIDTH Width;
EFI_STATUS Status;
ASSERT (mS3SaveState != NULL);
switch (ValueSize) {
case 1:
Width = EfiBootScriptWidthUint8;
break;
case 2:
Width = EfiBootScriptWidthUint16;
break;
case 4:
Width = EfiBootScriptWidthUint32;
break;
case 8:
Width = EfiBootScriptWidthUint64;
break;
default:
return RETURN_INVALID_PARAMETER;
}
if ((ValueSize < 8) &&
((RShiftU64 (ValueMask, ValueSize * 8) > 0) ||
(RShiftU64 (Value, ValueSize * 8) > 0)))
{
return RETURN_INVALID_PARAMETER;
}
if ((UINTN)ScratchData % ValueSize > 0) {
return RETURN_INVALID_PARAMETER;
}
if (((UINTN)ScratchData < (UINTN)mScratchBuffer) ||
((UINTN)ScratchData > MAX_UINTN - ValueSize) ||
((UINTN)ScratchData + ValueSize >
(UINTN)mScratchBuffer + mScratchBufferSize))
{
return RETURN_BAD_BUFFER_SIZE;
}
//
// The following opcode will wait "until" (*ScratchData & ValueMask) reads as
// Value, considering the least significant ValueSize bytes. As timeout we
// use MAX_UINT64 * 100ns, which is approximately 58494 years.
//
Status = mS3SaveState->Write (
mS3SaveState, // This
EFI_BOOT_SCRIPT_MEM_POLL_OPCODE, // OpCode
Width, // Width
(UINT64)(UINTN)ScratchData, // Address
(VOID *)&Value, // Data
(VOID *)&ValueMask, // DataMask
MAX_UINT64 // Delay
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"%a: %a: EFI_BOOT_SCRIPT_MEM_POLL_OPCODE: %r\n",
gEfiCallerBaseName,
__func__,
Status
));
return (RETURN_STATUS)Status;
}
return RETURN_SUCCESS;
}
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