sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
Files
ad1e45ddb54f4d416ba465ee36b51c88e5c4dfca
system76-edk2/OvmfPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c
Laszlo Ersek 5ef3b66fec OvmfPkg/SmmCpuFeaturesLib: SEV: encrypt+free pages of init. save state map 
Based on the following patch from Brijesh Singh <brijesh.singh@amd.com>:

  [PATCH v2 1/2] OvmfPkg/AmdSevDxe: Clear the C-bit from SMM Saved State
  http://mid.mail-archive.com/20180228161415.28723-2-brijesh.singh@amd.com
  https://lists.01.org/pipermail/edk2-devel/2018-February/022016.html

Once PiSmmCpuDxeSmm relocates SMBASE for all VCPUs, the pages of the
initial SMRAM save state map can be re-encrypted (including zeroing them
out after setting the C-bit on them), and they can be released to DXE for
general use (undoing the allocation that we did in PlatformPei's
AmdSevInitialize() function).

The decryption of the same pages (which will occur chronologically
earlier) is implemented in the next patch; hence the "re-encryption" part
of this patch is currently a no-op. The series is structured like this in
order to be bisection-friendly. If the decryption patch preceded this
patch, then an info leak would be created while standing between the
patches.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
2018-03-06 13:30:35 +01:00

1245 lines
43 KiB
C
Raw Blame History

/** @file
The CPU specific programming for PiSmmCpuDxeSmm module.
Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemEncryptSevLib.h>
#include <Library/SmmCpuFeaturesLib.h>
#include <Library/SmmServicesTableLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <PiSmm.h>
#include <Register/QemuSmramSaveStateMap.h>
//
// EFER register LMA bit
//
#define LMA BIT10
/**
The constructor function
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
**/
EFI_STATUS
EFIAPI
SmmCpuFeaturesLibConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
//
// No need to program SMRRs on our virtual platform.
//
return EFI_SUCCESS;
}
/**
Called during the very first SMI into System Management Mode to initialize
CPU features, including SMBASE, for the currently executing CPU. Since this
is the first SMI, the SMRAM Save State Map is at the default address of
SMM_DEFAULT_SMBASE + SMRAM_SAVE_STATE_MAP_OFFSET. The currently executing
CPU is specified by CpuIndex and CpuIndex can be used to access information
about the currently executing CPU in the ProcessorInfo array and the
HotPlugCpuData data structure.
@param[in] CpuIndex The index of the CPU to initialize. The value
must be between 0 and the NumberOfCpus field in
the System Management System Table (SMST).
@param[in] IsMonarch TRUE if the CpuIndex is the index of the CPU that
was elected as monarch during System Management
Mode initialization.
FALSE if the CpuIndex is not the index of the CPU
that was elected as monarch during System
Management Mode initialization.
@param[in] ProcessorInfo Pointer to an array of EFI_PROCESSOR_INFORMATION
structures. ProcessorInfo[CpuIndex] contains the
information for the currently executing CPU.
@param[in] CpuHotPlugData Pointer to the CPU_HOT_PLUG_DATA structure that
contains the ApidId and SmBase arrays.
**/
VOID
EFIAPI
SmmCpuFeaturesInitializeProcessor (
IN UINTN CpuIndex,
IN BOOLEAN IsMonarch,
IN EFI_PROCESSOR_INFORMATION *ProcessorInfo,
IN CPU_HOT_PLUG_DATA *CpuHotPlugData
)
{
QEMU_SMRAM_SAVE_STATE_MAP *CpuState;
//
// Configure SMBASE.
//
CpuState = (QEMU_SMRAM_SAVE_STATE_MAP *)(UINTN)(
SMM_DEFAULT_SMBASE +
SMRAM_SAVE_STATE_MAP_OFFSET
);
if ((CpuState->x86.SMMRevId & 0xFFFF) == 0) {
CpuState->x86.SMBASE = (UINT32)CpuHotPlugData->SmBase[CpuIndex];
} else {
CpuState->x64.SMBASE = (UINT32)CpuHotPlugData->SmBase[CpuIndex];
}
//
// No need to program SMRRs on our virtual platform.
//
}
/**
This function updates the SMRAM save state on the currently executing CPU
to resume execution at a specific address after an RSM instruction. This
function must evaluate the SMRAM save state to determine the execution mode
the RSM instruction resumes and update the resume execution address with
either NewInstructionPointer32 or NewInstructionPoint. The auto HALT restart
flag in the SMRAM save state must always be cleared. This function returns
the value of the instruction pointer from the SMRAM save state that was
replaced. If this function returns 0, then the SMRAM save state was not
modified.
This function is called during the very first SMI on each CPU after
SmmCpuFeaturesInitializeProcessor() to set a flag in normal execution mode
to signal that the SMBASE of each CPU has been updated before the default
SMBASE address is used for the first SMI to the next CPU.
@param[in] CpuIndex The index of the CPU to hook. The value
must be between 0 and the NumberOfCpus
field in the System Management System
Table (SMST).
@param[in] CpuState Pointer to SMRAM Save State Map for the
currently executing CPU.
@param[in] NewInstructionPointer32 Instruction pointer to use if resuming to
32-bit execution mode from 64-bit SMM.
@param[in] NewInstructionPointer Instruction pointer to use if resuming to
same execution mode as SMM.
@retval 0 This function did modify the SMRAM save state.
@retval > 0 The original instruction pointer value from the SMRAM save state
before it was replaced.
**/
UINT64
EFIAPI
SmmCpuFeaturesHookReturnFromSmm (
IN UINTN CpuIndex,
IN SMRAM_SAVE_STATE_MAP *CpuState,
IN UINT64 NewInstructionPointer32,
IN UINT64 NewInstructionPointer
)
{
UINT64 OriginalInstructionPointer;
QEMU_SMRAM_SAVE_STATE_MAP *CpuSaveState;
CpuSaveState = (QEMU_SMRAM_SAVE_STATE_MAP *)CpuState;
if ((CpuSaveState->x86.SMMRevId & 0xFFFF) == 0) {
OriginalInstructionPointer = (UINT64)CpuSaveState->x86._EIP;
CpuSaveState->x86._EIP = (UINT32)NewInstructionPointer;
//
// Clear the auto HALT restart flag so the RSM instruction returns
// program control to the instruction following the HLT instruction.
//
if ((CpuSaveState->x86.AutoHALTRestart & BIT0) != 0) {
CpuSaveState->x86.AutoHALTRestart &= ~BIT0;
}
} else {
OriginalInstructionPointer = CpuSaveState->x64._RIP;
if ((CpuSaveState->x64.IA32_EFER & LMA) == 0) {
CpuSaveState->x64._RIP = (UINT32)NewInstructionPointer32;
} else {
CpuSaveState->x64._RIP = (UINT32)NewInstructionPointer;
}
//
// Clear the auto HALT restart flag so the RSM instruction returns
// program control to the instruction following the HLT instruction.
//
if ((CpuSaveState->x64.AutoHALTRestart & BIT0) != 0) {
CpuSaveState->x64.AutoHALTRestart &= ~BIT0;
}
}
return OriginalInstructionPointer;
}
/**
Hook point in normal execution mode that allows the one CPU that was elected
as monarch during System Management Mode initialization to perform additional
initialization actions immediately after all of the CPUs have processed their
first SMI and called SmmCpuFeaturesInitializeProcessor() relocating SMBASE
into a buffer in SMRAM and called SmmCpuFeaturesHookReturnFromSmm().
**/
VOID
EFIAPI
SmmCpuFeaturesSmmRelocationComplete (
VOID
)
{
EFI_STATUS Status;
UINTN MapPagesBase;
UINTN MapPagesCount;
if (!MemEncryptSevIsEnabled ()) {
return;
}
//
// Now that SMBASE relocation is complete, re-encrypt the original SMRAM save
// state map's container pages, and release the pages to DXE. (The pages were
// allocated in PlatformPei.)
//
Status = MemEncryptSevLocateInitialSmramSaveStateMapPages (
&MapPagesBase,
&MapPagesCount
);
ASSERT_EFI_ERROR (Status);
Status = MemEncryptSevSetPageEncMask (
0, // Cr3BaseAddress -- use current CR3
MapPagesBase, // BaseAddress
MapPagesCount, // NumPages
TRUE // Flush
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: MemEncryptSevSetPageEncMask(): %r\n",
__FUNCTION__, Status));
ASSERT (FALSE);
CpuDeadLoop ();
}
ZeroMem ((VOID *)MapPagesBase, EFI_PAGES_TO_SIZE (MapPagesCount));
Status = gBS->FreePages (MapPagesBase, MapPagesCount);
ASSERT_EFI_ERROR (Status);
}
/**
Return the size, in bytes, of a custom SMI Handler in bytes. If 0 is
returned, then a custom SMI handler is not provided by this library,
and the default SMI handler must be used.
@retval 0 Use the default SMI handler.
@retval > 0 Use the SMI handler installed by
SmmCpuFeaturesInstallSmiHandler(). The caller is required to
allocate enough SMRAM for each CPU to support the size of the
custom SMI handler.
**/
UINTN
EFIAPI
SmmCpuFeaturesGetSmiHandlerSize (
VOID
)
{
return 0;
}
/**
Install a custom SMI handler for the CPU specified by CpuIndex. This
function is only called if SmmCpuFeaturesGetSmiHandlerSize() returns a size
is greater than zero and is called by the CPU that was elected as monarch
during System Management Mode initialization.
@param[in] CpuIndex The index of the CPU to install the custom SMI handler.
The value must be between 0 and the NumberOfCpus field
in the System Management System Table (SMST).
@param[in] SmBase The SMBASE address for the CPU specified by CpuIndex.
@param[in] SmiStack The stack to use when an SMI is processed by the
the CPU specified by CpuIndex.
@param[in] StackSize The size, in bytes, if the stack used when an SMI is
processed by the CPU specified by CpuIndex.
@param[in] GdtBase The base address of the GDT to use when an SMI is
processed by the CPU specified by CpuIndex.
@param[in] GdtSize The size, in bytes, of the GDT used when an SMI is
processed by the CPU specified by CpuIndex.
@param[in] IdtBase The base address of the IDT to use when an SMI is
processed by the CPU specified by CpuIndex.
@param[in] IdtSize The size, in bytes, of the IDT used when an SMI is
processed by the CPU specified by CpuIndex.
@param[in] Cr3 The base address of the page tables to use when an SMI
is processed by the CPU specified by CpuIndex.
**/
VOID
EFIAPI
SmmCpuFeaturesInstallSmiHandler (
IN UINTN CpuIndex,
IN UINT32 SmBase,
IN VOID *SmiStack,
IN UINTN StackSize,
IN UINTN GdtBase,
IN UINTN GdtSize,
IN UINTN IdtBase,
IN UINTN IdtSize,
IN UINT32 Cr3
)
{
}
/**
Determines if MTRR registers must be configured to set SMRAM cache-ability
when executing in System Management Mode.
@retval TRUE MTRR registers must be configured to set SMRAM cache-ability.
@retval FALSE MTRR registers do not need to be configured to set SMRAM
cache-ability.
**/
BOOLEAN
EFIAPI
SmmCpuFeaturesNeedConfigureMtrrs (
VOID
)
{
return FALSE;
}
/**
Disable SMRR register if SMRR is supported and
SmmCpuFeaturesNeedConfigureMtrrs() returns TRUE.
**/
VOID
EFIAPI
SmmCpuFeaturesDisableSmrr (
VOID
)
{
//
// No SMRR support, nothing to do
//
}
/**
Enable SMRR register if SMRR is supported and
SmmCpuFeaturesNeedConfigureMtrrs() returns TRUE.
**/
VOID
EFIAPI
SmmCpuFeaturesReenableSmrr (
VOID
)
{
//
// No SMRR support, nothing to do
//
}
/**
Processor specific hook point each time a CPU enters System Management Mode.
@param[in] CpuIndex The index of the CPU that has entered SMM. The value
must be between 0 and the NumberOfCpus field in the
System Management System Table (SMST).
**/
VOID
EFIAPI
SmmCpuFeaturesRendezvousEntry (
IN UINTN CpuIndex
)
{
//
// No SMRR support, nothing to do
//
}
/**
Processor specific hook point each time a CPU exits System Management Mode.
@param[in] CpuIndex The index of the CPU that is exiting SMM. The value
must be between 0 and the NumberOfCpus field in the
System Management System Table (SMST).
**/
VOID
EFIAPI
SmmCpuFeaturesRendezvousExit (
IN UINTN CpuIndex
)
{
}
/**
Check to see if an SMM register is supported by a specified CPU.
@param[in] CpuIndex The index of the CPU to check for SMM register support.
The value must be between 0 and the NumberOfCpus field
in the System Management System Table (SMST).
@param[in] RegName Identifies the SMM register to check for support.
@retval TRUE The SMM register specified by RegName is supported by the CPU
specified by CpuIndex.
@retval FALSE The SMM register specified by RegName is not supported by the
CPU specified by CpuIndex.
**/
BOOLEAN
EFIAPI
SmmCpuFeaturesIsSmmRegisterSupported (
IN UINTN CpuIndex,
IN SMM_REG_NAME RegName
)
{
ASSERT (RegName == SmmRegFeatureControl);
return FALSE;
}
/**
Returns the current value of the SMM register for the specified CPU.
If the SMM register is not supported, then 0 is returned.
@param[in] CpuIndex The index of the CPU to read the SMM register. The
value must be between 0 and the NumberOfCpus field in
the System Management System Table (SMST).
@param[in] RegName Identifies the SMM register to read.
@return The value of the SMM register specified by RegName from the CPU
specified by CpuIndex.
**/
UINT64
EFIAPI
SmmCpuFeaturesGetSmmRegister (
IN UINTN CpuIndex,
IN SMM_REG_NAME RegName
)
{
//
// This is called for SmmRegSmmDelayed, SmmRegSmmBlocked, SmmRegSmmEnable.
// The last of these should actually be SmmRegSmmDisable, so we can just
// return FALSE.
//
return 0;
}
/**
Sets the value of an SMM register on a specified CPU.
If the SMM register is not supported, then no action is performed.
@param[in] CpuIndex The index of the CPU to write the SMM register. The
value must be between 0 and the NumberOfCpus field in
the System Management System Table (SMST).
@param[in] RegName Identifies the SMM register to write.
registers are read-only.
@param[in] Value The value to write to the SMM register.
**/
VOID
EFIAPI
SmmCpuFeaturesSetSmmRegister (
IN UINTN CpuIndex,
IN SMM_REG_NAME RegName,
IN UINT64 Value
)
{
ASSERT (FALSE);
}
///
/// Macro used to simplify the lookup table entries of type
/// CPU_SMM_SAVE_STATE_LOOKUP_ENTRY
///
#define SMM_CPU_OFFSET(Field) OFFSET_OF (QEMU_SMRAM_SAVE_STATE_MAP, Field)
///
/// Macro used to simplify the lookup table entries of type
/// CPU_SMM_SAVE_STATE_REGISTER_RANGE
///
#define SMM_REGISTER_RANGE(Start, End) { Start, End, End - Start + 1 }
///
/// Structure used to describe a range of registers
///
typedef struct {
EFI_SMM_SAVE_STATE_REGISTER Start;
EFI_SMM_SAVE_STATE_REGISTER End;
UINTN Length;
} CPU_SMM_SAVE_STATE_REGISTER_RANGE;
///
/// Structure used to build a lookup table to retrieve the widths and offsets
/// associated with each supported EFI_SMM_SAVE_STATE_REGISTER value
///
#define SMM_SAVE_STATE_REGISTER_FIRST_INDEX 1
typedef struct {
UINT8 Width32;
UINT8 Width64;
UINT16 Offset32;
UINT16 Offset64Lo;
UINT16 Offset64Hi;
BOOLEAN Writeable;
} CPU_SMM_SAVE_STATE_LOOKUP_ENTRY;
///
/// Table used by GetRegisterIndex() to convert an EFI_SMM_SAVE_STATE_REGISTER
/// value to an index into a table of type CPU_SMM_SAVE_STATE_LOOKUP_ENTRY
///
STATIC CONST CPU_SMM_SAVE_STATE_REGISTER_RANGE mSmmCpuRegisterRanges[] = {
SMM_REGISTER_RANGE (
EFI_SMM_SAVE_STATE_REGISTER_GDTBASE,
EFI_SMM_SAVE_STATE_REGISTER_LDTINFO
),
SMM_REGISTER_RANGE (
EFI_SMM_SAVE_STATE_REGISTER_ES,
EFI_SMM_SAVE_STATE_REGISTER_RIP
),
SMM_REGISTER_RANGE (
EFI_SMM_SAVE_STATE_REGISTER_RFLAGS,
EFI_SMM_SAVE_STATE_REGISTER_CR4
),
{ (EFI_SMM_SAVE_STATE_REGISTER)0, (EFI_SMM_SAVE_STATE_REGISTER)0, 0 }
};
///
/// Lookup table used to retrieve the widths and offsets associated with each
/// supported EFI_SMM_SAVE_STATE_REGISTER value
///
STATIC CONST CPU_SMM_SAVE_STATE_LOOKUP_ENTRY mSmmCpuWidthOffset[] = {
{
0, // Width32
0, // Width64
0, // Offset32
0, // Offset64Lo
0, // Offset64Hi
FALSE // Writeable
}, // Reserved
//
// CPU Save State registers defined in PI SMM CPU Protocol.
//
{
0, // Width32
8, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._GDTRBase), // Offset64Lo
SMM_CPU_OFFSET (x64._GDTRBase) + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_GDTBASE = 4
{
0, // Width32
8, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._IDTRBase), // Offset64Lo
SMM_CPU_OFFSET (x64._IDTRBase) + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_IDTBASE = 5
{
0, // Width32
8, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._LDTRBase), // Offset64Lo
SMM_CPU_OFFSET (x64._LDTRBase) + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_LDTBASE = 6
{
0, // Width32
0, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._GDTRLimit), // Offset64Lo
SMM_CPU_OFFSET (x64._GDTRLimit) + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_GDTLIMIT = 7
{
0, // Width32
0, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._IDTRLimit), // Offset64Lo
SMM_CPU_OFFSET (x64._IDTRLimit) + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_IDTLIMIT = 8
{
0, // Width32
0, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._LDTRLimit), // Offset64Lo
SMM_CPU_OFFSET (x64._LDTRLimit) + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_LDTLIMIT = 9
{
0, // Width32
0, // Width64
0, // Offset32
0, // Offset64Lo
0 + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_LDTINFO = 10
{
4, // Width32
4, // Width64
SMM_CPU_OFFSET (x86._ES), // Offset32
SMM_CPU_OFFSET (x64._ES), // Offset64Lo
0, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_ES = 20
{
4, // Width32
4, // Width64
SMM_CPU_OFFSET (x86._CS), // Offset32
SMM_CPU_OFFSET (x64._CS), // Offset64Lo
0, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_CS = 21
{
4, // Width32
4, // Width64
SMM_CPU_OFFSET (x86._SS), // Offset32
SMM_CPU_OFFSET (x64._SS), // Offset64Lo
0, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_SS = 22
{
4, // Width32
4, // Width64
SMM_CPU_OFFSET (x86._DS), // Offset32
SMM_CPU_OFFSET (x64._DS), // Offset64Lo
0, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_DS = 23
{
4, // Width32
4, // Width64
SMM_CPU_OFFSET (x86._FS), // Offset32
SMM_CPU_OFFSET (x64._FS), // Offset64Lo
0, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_FS = 24
{
4, // Width32
4, // Width64
SMM_CPU_OFFSET (x86._GS), // Offset32
SMM_CPU_OFFSET (x64._GS), // Offset64Lo
0, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_GS = 25
{
0, // Width32
4, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._LDTR), // Offset64Lo
0, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_LDTR_SEL = 26
{
4, // Width32
4, // Width64
SMM_CPU_OFFSET (x86._TR), // Offset32
SMM_CPU_OFFSET (x64._TR), // Offset64Lo
0, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_TR_SEL = 27
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._DR7), // Offset32
SMM_CPU_OFFSET (x64._DR7), // Offset64Lo
SMM_CPU_OFFSET (x64._DR7) + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_DR7 = 28
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._DR6), // Offset32
SMM_CPU_OFFSET (x64._DR6), // Offset64Lo
SMM_CPU_OFFSET (x64._DR6) + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_DR6 = 29
{
0, // Width32
8, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._R8), // Offset64Lo
SMM_CPU_OFFSET (x64._R8) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_R8 = 30
{
0, // Width32
8, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._R9), // Offset64Lo
SMM_CPU_OFFSET (x64._R9) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_R9 = 31
{
0, // Width32
8, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._R10), // Offset64Lo
SMM_CPU_OFFSET (x64._R10) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_R10 = 32
{
0, // Width32
8, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._R11), // Offset64Lo
SMM_CPU_OFFSET (x64._R11) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_R11 = 33
{
0, // Width32
8, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._R12), // Offset64Lo
SMM_CPU_OFFSET (x64._R12) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_R12 = 34
{
0, // Width32
8, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._R13), // Offset64Lo
SMM_CPU_OFFSET (x64._R13) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_R13 = 35
{
0, // Width32
8, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._R14), // Offset64Lo
SMM_CPU_OFFSET (x64._R14) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_R14 = 36
{
0, // Width32
8, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._R15), // Offset64Lo
SMM_CPU_OFFSET (x64._R15) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_R15 = 37
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._EAX), // Offset32
SMM_CPU_OFFSET (x64._RAX), // Offset64Lo
SMM_CPU_OFFSET (x64._RAX) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_RAX = 38
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._EBX), // Offset32
SMM_CPU_OFFSET (x64._RBX), // Offset64Lo
SMM_CPU_OFFSET (x64._RBX) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_RBX = 39
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._ECX), // Offset32
SMM_CPU_OFFSET (x64._RCX), // Offset64Lo
SMM_CPU_OFFSET (x64._RCX) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_RCX = 40
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._EDX), // Offset32
SMM_CPU_OFFSET (x64._RDX), // Offset64Lo
SMM_CPU_OFFSET (x64._RDX) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_RDX = 41
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._ESP), // Offset32
SMM_CPU_OFFSET (x64._RSP), // Offset64Lo
SMM_CPU_OFFSET (x64._RSP) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_RSP = 42
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._EBP), // Offset32
SMM_CPU_OFFSET (x64._RBP), // Offset64Lo
SMM_CPU_OFFSET (x64._RBP) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_RBP = 43
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._ESI), // Offset32
SMM_CPU_OFFSET (x64._RSI), // Offset64Lo
SMM_CPU_OFFSET (x64._RSI) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_RSI = 44
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._EDI), // Offset32
SMM_CPU_OFFSET (x64._RDI), // Offset64Lo
SMM_CPU_OFFSET (x64._RDI) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_RDI = 45
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._EIP), // Offset32
SMM_CPU_OFFSET (x64._RIP), // Offset64Lo
SMM_CPU_OFFSET (x64._RIP) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_RIP = 46
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._EFLAGS), // Offset32
SMM_CPU_OFFSET (x64._RFLAGS), // Offset64Lo
SMM_CPU_OFFSET (x64._RFLAGS) + 4, // Offset64Hi
TRUE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_RFLAGS = 51
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._CR0), // Offset32
SMM_CPU_OFFSET (x64._CR0), // Offset64Lo
SMM_CPU_OFFSET (x64._CR0) + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_CR0 = 52
{
4, // Width32
8, // Width64
SMM_CPU_OFFSET (x86._CR3), // Offset32
SMM_CPU_OFFSET (x64._CR3), // Offset64Lo
SMM_CPU_OFFSET (x64._CR3) + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_CR3 = 53
{
0, // Width32
4, // Width64
0, // Offset32
SMM_CPU_OFFSET (x64._CR4), // Offset64Lo
SMM_CPU_OFFSET (x64._CR4) + 4, // Offset64Hi
FALSE // Writeable
}, // EFI_SMM_SAVE_STATE_REGISTER_CR4 = 54
};
//
// No support for I/O restart
//
/**
Read information from the CPU save state.
@param Register Specifies the CPU register to read form the save state.
@retval 0 Register is not valid
@retval >0 Index into mSmmCpuWidthOffset[] associated with Register
**/
STATIC
UINTN
GetRegisterIndex (
IN EFI_SMM_SAVE_STATE_REGISTER Register
)
{
UINTN Index;
UINTN Offset;
for (Index = 0, Offset = SMM_SAVE_STATE_REGISTER_FIRST_INDEX;
mSmmCpuRegisterRanges[Index].Length != 0;
Index++) {
if (Register >= mSmmCpuRegisterRanges[Index].Start &&
Register <= mSmmCpuRegisterRanges[Index].End) {
return Register - mSmmCpuRegisterRanges[Index].Start + Offset;
}
Offset += mSmmCpuRegisterRanges[Index].Length;
}
return 0;
}
/**
Read a CPU Save State register on the target processor.
This function abstracts the differences that whether the CPU Save State
register is in the IA32 CPU Save State Map or X64 CPU Save State Map.
This function supports reading a CPU Save State register in SMBase relocation
handler.
@param[in] CpuIndex Specifies the zero-based index of the CPU save
state.
@param[in] RegisterIndex Index into mSmmCpuWidthOffset[] look up table.
@param[in] Width The number of bytes to read from the CPU save
state.
@param[out] Buffer Upon return, this holds the CPU register value
read from the save state.
@retval EFI_SUCCESS The register was read from Save State.
@retval EFI_NOT_FOUND The register is not defined for the Save State
of Processor.
@retval EFI_INVALID_PARAMTER This or Buffer is NULL.
**/
STATIC
EFI_STATUS
ReadSaveStateRegisterByIndex (
IN UINTN CpuIndex,
IN UINTN RegisterIndex,
IN UINTN Width,
OUT VOID *Buffer
)
{
QEMU_SMRAM_SAVE_STATE_MAP *CpuSaveState;
CpuSaveState = (QEMU_SMRAM_SAVE_STATE_MAP *)gSmst->CpuSaveState[CpuIndex];
if ((CpuSaveState->x86.SMMRevId & 0xFFFF) == 0) {
//
// If 32-bit mode width is zero, then the specified register can not be
// accessed
//
if (mSmmCpuWidthOffset[RegisterIndex].Width32 == 0) {
return EFI_NOT_FOUND;
}
//
// If Width is bigger than the 32-bit mode width, then the specified
// register can not be accessed
//
if (Width > mSmmCpuWidthOffset[RegisterIndex].Width32) {
return EFI_INVALID_PARAMETER;
}
//
// Write return buffer
//
ASSERT(CpuSaveState != NULL);
CopyMem (
Buffer,
(UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset32,
Width
);
} else {
//
// If 64-bit mode width is zero, then the specified register can not be
// accessed
//
if (mSmmCpuWidthOffset[RegisterIndex].Width64 == 0) {
return EFI_NOT_FOUND;
}
//
// If Width is bigger than the 64-bit mode width, then the specified
// register can not be accessed
//
if (Width > mSmmCpuWidthOffset[RegisterIndex].Width64) {
return EFI_INVALID_PARAMETER;
}
//
// Write lower 32-bits of return buffer
//
CopyMem (
Buffer,
(UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset64Lo,
MIN (4, Width)
);
if (Width >= 4) {
//
// Write upper 32-bits of return buffer
//
CopyMem (
(UINT8 *)Buffer + 4,
(UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset64Hi,
Width - 4
);
}
}
return EFI_SUCCESS;
}
/**
Read an SMM Save State register on the target processor. If this function
returns EFI_UNSUPPORTED, then the caller is responsible for reading the
SMM Save Sate register.
@param[in] CpuIndex The index of the CPU to read the SMM Save State. The
value must be between 0 and the NumberOfCpus field in
the System Management System Table (SMST).
@param[in] Register The SMM Save State register to read.
@param[in] Width The number of bytes to read from the CPU save state.
@param[out] Buffer Upon return, this holds the CPU register value read
from the save state.
@retval EFI_SUCCESS The register was read from Save State.
@retval EFI_INVALID_PARAMTER Buffer is NULL.
@retval EFI_UNSUPPORTED This function does not support reading
Register.
**/
EFI_STATUS
EFIAPI
SmmCpuFeaturesReadSaveStateRegister (
IN UINTN CpuIndex,
IN EFI_SMM_SAVE_STATE_REGISTER Register,
IN UINTN Width,
OUT VOID *Buffer
)
{
UINTN RegisterIndex;
QEMU_SMRAM_SAVE_STATE_MAP *CpuSaveState;
//
// Check for special EFI_SMM_SAVE_STATE_REGISTER_LMA
//
if (Register == EFI_SMM_SAVE_STATE_REGISTER_LMA) {
//
// Only byte access is supported for this register
//
if (Width != 1) {
return EFI_INVALID_PARAMETER;
}
CpuSaveState = (QEMU_SMRAM_SAVE_STATE_MAP *)gSmst->CpuSaveState[CpuIndex];
//
// Check CPU mode
//
if ((CpuSaveState->x86.SMMRevId & 0xFFFF) == 0) {
*(UINT8 *)Buffer = 32;
} else {
*(UINT8 *)Buffer = 64;
}
return EFI_SUCCESS;
}
//
// Check for special EFI_SMM_SAVE_STATE_REGISTER_IO
//
if (Register == EFI_SMM_SAVE_STATE_REGISTER_IO) {
return EFI_NOT_FOUND;
}
//
// Convert Register to a register lookup table index. Let
// PiSmmCpuDxeSmm implement other special registers (currently
// there is only EFI_SMM_SAVE_STATE_REGISTER_PROCESSOR_ID).
//
RegisterIndex = GetRegisterIndex (Register);
if (RegisterIndex == 0) {
return (Register < EFI_SMM_SAVE_STATE_REGISTER_IO ?
EFI_NOT_FOUND :
EFI_UNSUPPORTED);
}
return ReadSaveStateRegisterByIndex (CpuIndex, RegisterIndex, Width, Buffer);
}
/**
Writes an SMM Save State register on the target processor. If this function
returns EFI_UNSUPPORTED, then the caller is responsible for writing the
SMM Save Sate register.
@param[in] CpuIndex The index of the CPU to write the SMM Save State. The
value must be between 0 and the NumberOfCpus field in
the System Management System Table (SMST).
@param[in] Register The SMM Save State register to write.
@param[in] Width The number of bytes to write to the CPU save state.
@param[in] Buffer Upon entry, this holds the new CPU register value.
@retval EFI_SUCCESS The register was written to Save State.
@retval EFI_INVALID_PARAMTER Buffer is NULL.
@retval EFI_UNSUPPORTED This function does not support writing
Register.
**/
EFI_STATUS
EFIAPI
SmmCpuFeaturesWriteSaveStateRegister (
IN UINTN CpuIndex,
IN EFI_SMM_SAVE_STATE_REGISTER Register,
IN UINTN Width,
IN CONST VOID *Buffer
)
{
UINTN RegisterIndex;
QEMU_SMRAM_SAVE_STATE_MAP *CpuSaveState;
//
// Writes to EFI_SMM_SAVE_STATE_REGISTER_LMA are ignored
//
if (Register == EFI_SMM_SAVE_STATE_REGISTER_LMA) {
return EFI_SUCCESS;
}
//
// Writes to EFI_SMM_SAVE_STATE_REGISTER_IO are not supported
//
if (Register == EFI_SMM_SAVE_STATE_REGISTER_IO) {
return EFI_NOT_FOUND;
}
//
// Convert Register to a register lookup table index. Let
// PiSmmCpuDxeSmm implement other special registers (currently
// there is only EFI_SMM_SAVE_STATE_REGISTER_PROCESSOR_ID).
//
RegisterIndex = GetRegisterIndex (Register);
if (RegisterIndex == 0) {
return (Register < EFI_SMM_SAVE_STATE_REGISTER_IO ?
EFI_NOT_FOUND :
EFI_UNSUPPORTED);
}
CpuSaveState = (QEMU_SMRAM_SAVE_STATE_MAP *)gSmst->CpuSaveState[CpuIndex];
//
// Do not write non-writable SaveState, because it will cause exception.
//
if (!mSmmCpuWidthOffset[RegisterIndex].Writeable) {
return EFI_UNSUPPORTED;
}
//
// Check CPU mode
//
if ((CpuSaveState->x86.SMMRevId & 0xFFFF) == 0) {
//
// If 32-bit mode width is zero, then the specified register can not be
// accessed
//
if (mSmmCpuWidthOffset[RegisterIndex].Width32 == 0) {
return EFI_NOT_FOUND;
}
//
// If Width is bigger than the 32-bit mode width, then the specified
// register can not be accessed
//
if (Width > mSmmCpuWidthOffset[RegisterIndex].Width32) {
return EFI_INVALID_PARAMETER;
}
//
// Write SMM State register
//
ASSERT (CpuSaveState != NULL);
CopyMem (
(UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset32,
Buffer,
Width
);
} else {
//
// If 64-bit mode width is zero, then the specified register can not be
// accessed
//
if (mSmmCpuWidthOffset[RegisterIndex].Width64 == 0) {
return EFI_NOT_FOUND;
}
//
// If Width is bigger than the 64-bit mode width, then the specified
// register can not be accessed
//
if (Width > mSmmCpuWidthOffset[RegisterIndex].Width64) {
return EFI_INVALID_PARAMETER;
}
//
// Write lower 32-bits of SMM State register
//
CopyMem (
(UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset64Lo,
Buffer,
MIN (4, Width)
);
if (Width >= 4) {
//
// Write upper 32-bits of SMM State register
//
CopyMem (
(UINT8 *)CpuSaveState + mSmmCpuWidthOffset[RegisterIndex].Offset64Hi,
(UINT8 *)Buffer + 4,
Width - 4
);
}
}
return EFI_SUCCESS;
}
/**
This function is hook point called after the gEfiSmmReadyToLockProtocolGuid
notification is completely processed.
**/
VOID
EFIAPI
SmmCpuFeaturesCompleteSmmReadyToLock (
VOID
)
{
}
/**
This API provides a method for a CPU to allocate a specific region for
storing page tables.
This API can be called more once to allocate memory for page tables.
Allocates the number of 4KB pages of type EfiRuntimeServicesData and returns
a pointer to the allocated buffer. The buffer returned is aligned on a 4KB
boundary. If Pages is 0, then NULL is returned. If there is not enough
memory remaining to satisfy the request, then NULL is returned.
This function can also return NULL if there is no preference on where the
page tables are allocated in SMRAM.
@param Pages The number of 4 KB pages to allocate.
@return A pointer to the allocated buffer for page tables.
@retval NULL Fail to allocate a specific region for storing page tables,
Or there is no preference on where the page tables are
allocated in SMRAM.
**/
VOID *
EFIAPI
SmmCpuFeaturesAllocatePageTableMemory (
IN UINTN Pages
)
{
return NULL;
}
Reference in New Issue View Git Blame Copy Permalink