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aa5f60ae41
There are cases that the operands of an expression are all with rank less
than UINT64/INT64 and the result of the expression is explicitly cast to
UINT64/INT64 to fit the target size.
An example will be:
UINT32 a,b;
// a and b can be any unsigned int type with rank less than UINT64, like
// UINT8, UINT16, etc.
UINT64 c;
c = (UINT64) (a + b);
Some static code checkers may warn that the expression result might
overflow within the rank of "int" (integer promotions) and the result is
then cast to a bigger size.
The commit refines codes by the following rules:
1). When the expression is possible to overflow the range of unsigned int/
int:
c = (UINT64)a + b;
2). When the expression will not overflow within the rank of "int", remove
the explicit type casts:
c = a + b;
3). When the expression will be cast to pointer of possible greater size:
UINT32 a,b;
VOID *c;
c = (VOID *)(UINTN)(a + b); --> c = (VOID *)((UINTN)a + b);
4). When one side of a comparison expression contains only operands with
rank less than UINT32:
UINT8 a;
UINT16 b;
UINTN c;
if ((UINTN)(a + b) > c) {...} --> if (((UINT32)a + b) > c) {...}
For rule 4), if we remove the 'UINTN' type cast like:
if (a + b > c) {...}
The VS compiler will complain with warning C4018 (signed/unsigned
mismatch, level 3 warning) due to promoting 'a + b' to type 'int'.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>
589 lines
22 KiB
C
589 lines
22 KiB
C
/** @file
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Uses the services of the I/O Library to produce the CPU I/O Protocol
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Copyright (c) 2004 - 2017, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
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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 "CpuIo.h"
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//
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// Handle for the CPU I/O Protocol
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//
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EFI_HANDLE mHandle = NULL;
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//
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// CPU I/O Protocol inatance
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//
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EFI_CPU_IO_PROTOCOL mCpuIo = {
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{
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CpuMemoryServiceRead,
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CpuMemoryServiceWrite
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},
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{
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CpuIoServiceRead,
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CpuIoServiceWrite
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}
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};
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//
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// Lookup table for increment values based on transfer widths
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//
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UINT8 mInStride[] = {
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1, // EfiCpuIoWidthUint8
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2, // EfiCpuIoWidthUint16
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4, // EfiCpuIoWidthUint32
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8, // EfiCpuIoWidthUint64
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0, // EfiCpuIoWidthFifoUint8
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0, // EfiCpuIoWidthFifoUint16
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0, // EfiCpuIoWidthFifoUint32
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0, // EfiCpuIoWidthFifoUint64
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1, // EfiCpuIoWidthFillUint8
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2, // EfiCpuIoWidthFillUint16
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4, // EfiCpuIoWidthFillUint32
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8 // EfiCpuIoWidthFillUint64
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};
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//
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// Lookup table for increment values based on transfer widths
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//
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UINT8 mOutStride[] = {
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1, // EfiCpuIoWidthUint8
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2, // EfiCpuIoWidthUint16
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4, // EfiCpuIoWidthUint32
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8, // EfiCpuIoWidthUint64
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1, // EfiCpuIoWidthFifoUint8
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2, // EfiCpuIoWidthFifoUint16
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4, // EfiCpuIoWidthFifoUint32
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8, // EfiCpuIoWidthFifoUint64
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0, // EfiCpuIoWidthFillUint8
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0, // EfiCpuIoWidthFillUint16
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0, // EfiCpuIoWidthFillUint32
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0 // EfiCpuIoWidthFillUint64
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};
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/**
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Check parameters to a CPU I/O Protocol service request.
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The I/O operations are carried out exactly as requested. The caller is responsible
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for satisfying any alignment and I/O width restrictions that a PI System on a
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platform might require. For example on some platforms, width requests of
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EfiCpuIoWidthUint64 do not work. Misaligned buffers, on the other hand, will
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be handled by the driver.
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@param[in] MmioOperation TRUE for an MMIO operation, FALSE for I/O Port operation.
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@param[in] Width Signifies the width of the I/O or Memory operation.
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@param[in] Address The base address of the I/O operation.
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@param[in] Count The number of I/O operations to perform. The number of
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bytes moved is Width size * Count, starting at Address.
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@param[in] Buffer For read operations, the destination buffer to store the results.
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For write operations, the source buffer from which to write data.
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@retval EFI_SUCCESS The parameters for this request pass the checks.
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@retval EFI_INVALID_PARAMETER Width is invalid for this PI system.
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@retval EFI_INVALID_PARAMETER Buffer is NULL.
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@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
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@retval EFI_UNSUPPORTED The address range specified by Address, Width,
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and Count is not valid for this PI system.
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**/
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EFI_STATUS
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CpuIoCheckParameter (
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IN BOOLEAN MmioOperation,
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IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
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IN UINT64 Address,
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IN UINTN Count,
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IN VOID *Buffer
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)
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{
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UINT64 MaxCount;
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UINT64 Limit;
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//
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// Check to see if Buffer is NULL
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//
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if (Buffer == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Check to see if Width is in the valid range
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//
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if ((UINT32)Width >= EfiCpuIoWidthMaximum) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// For FIFO type, the target address won't increase during the access,
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// so treat Count as 1
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//
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if (Width >= EfiCpuIoWidthFifoUint8 && Width <= EfiCpuIoWidthFifoUint64) {
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Count = 1;
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}
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//
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// Check to see if Width is in the valid range for I/O Port operations
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//
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Width = (EFI_CPU_IO_PROTOCOL_WIDTH) (Width & 0x03);
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if (!MmioOperation && (Width == EfiCpuIoWidthUint64)) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Check to see if Address is aligned
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//
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if ((Address & ((UINT64)mInStride[Width] - 1)) != 0) {
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return EFI_UNSUPPORTED;
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}
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//
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// Check to see if any address associated with this transfer exceeds the maximum
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// allowed address. The maximum address implied by the parameters passed in is
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// Address + Size * Count. If the following condition is met, then the transfer
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// is not supported.
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//
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// Address + Size * Count > (MmioOperation ? MAX_ADDRESS : MAX_IO_PORT_ADDRESS) + 1
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//
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// Since MAX_ADDRESS can be the maximum integer value supported by the CPU and Count
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// can also be the maximum integer value supported by the CPU, this range
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// check must be adjusted to avoid all overflow conditions.
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//
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// The following form of the range check is equivalent but assumes that
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// MAX_ADDRESS and MAX_IO_PORT_ADDRESS are of the form (2^n - 1).
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//
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Limit = (MmioOperation ? MAX_ADDRESS : MAX_IO_PORT_ADDRESS);
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if (Count == 0) {
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if (Address > Limit) {
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return EFI_UNSUPPORTED;
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}
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} else {
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MaxCount = RShiftU64 (Limit, Width);
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if (MaxCount < (Count - 1)) {
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return EFI_UNSUPPORTED;
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}
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if (Address > LShiftU64 (MaxCount - Count + 1, Width)) {
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return EFI_UNSUPPORTED;
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}
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}
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//
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// Check to see if Buffer is aligned
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// (IA-32 allows UINT64 and INT64 data types to be 32-bit aligned.)
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//
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if (((UINTN)Buffer & ((MIN (sizeof (UINTN), mInStride[Width]) - 1))) != 0) {
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return EFI_UNSUPPORTED;
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}
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return EFI_SUCCESS;
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}
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/**
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Reads memory-mapped registers.
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The I/O operations are carried out exactly as requested. The caller is responsible
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for satisfying any alignment and I/O width restrictions that a PI System on a
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platform might require. For example on some platforms, width requests of
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EfiCpuIoWidthUint64 do not work. Misaligned buffers, on the other hand, will
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be handled by the driver.
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If Width is EfiCpuIoWidthUint8, EfiCpuIoWidthUint16, EfiCpuIoWidthUint32,
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or EfiCpuIoWidthUint64, then both Address and Buffer are incremented for
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each of the Count operations that is performed.
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If Width is EfiCpuIoWidthFifoUint8, EfiCpuIoWidthFifoUint16,
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EfiCpuIoWidthFifoUint32, or EfiCpuIoWidthFifoUint64, then only Buffer is
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incremented for each of the Count operations that is performed. The read or
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write operation is performed Count times on the same Address.
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If Width is EfiCpuIoWidthFillUint8, EfiCpuIoWidthFillUint16,
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EfiCpuIoWidthFillUint32, or EfiCpuIoWidthFillUint64, then only Address is
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incremented for each of the Count operations that is performed. The read or
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write operation is performed Count times from the first element of Buffer.
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@param[in] This A pointer to the EFI_CPU_IO_PROTOCOL instance.
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@param[in] Width Signifies the width of the I/O or Memory operation.
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@param[in] Address The base address of the I/O operation.
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@param[in] Count The number of I/O operations to perform. The number of
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bytes moved is Width size * Count, starting at Address.
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@param[out] Buffer For read operations, the destination buffer to store the results.
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For write operations, the source buffer from which to write data.
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@retval EFI_SUCCESS The data was read from or written to the PI system.
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@retval EFI_INVALID_PARAMETER Width is invalid for this PI system.
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@retval EFI_INVALID_PARAMETER Buffer is NULL.
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@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
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@retval EFI_UNSUPPORTED The address range specified by Address, Width,
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and Count is not valid for this PI system.
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**/
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EFI_STATUS
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EFIAPI
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CpuMemoryServiceRead (
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IN EFI_CPU_IO_PROTOCOL *This,
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IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
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IN UINT64 Address,
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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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EFI_STATUS Status;
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UINT8 InStride;
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UINT8 OutStride;
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EFI_CPU_IO_PROTOCOL_WIDTH OperationWidth;
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UINT8 *Uint8Buffer;
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Status = CpuIoCheckParameter (TRUE, Width, Address, Count, Buffer);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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//
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// Select loop based on the width of the transfer
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//
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InStride = mInStride[Width];
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OutStride = mOutStride[Width];
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OperationWidth = (EFI_CPU_IO_PROTOCOL_WIDTH) (Width & 0x03);
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for (Uint8Buffer = Buffer; Count > 0; Address += InStride, Uint8Buffer += OutStride, Count--) {
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if (OperationWidth == EfiCpuIoWidthUint8) {
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*Uint8Buffer = MmioRead8 ((UINTN)Address);
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} else if (OperationWidth == EfiCpuIoWidthUint16) {
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*((UINT16 *)Uint8Buffer) = MmioRead16 ((UINTN)Address);
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} else if (OperationWidth == EfiCpuIoWidthUint32) {
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*((UINT32 *)Uint8Buffer) = MmioRead32 ((UINTN)Address);
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} else if (OperationWidth == EfiCpuIoWidthUint64) {
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*((UINT64 *)Uint8Buffer) = MmioRead64 ((UINTN)Address);
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}
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}
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return EFI_SUCCESS;
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}
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/**
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Writes memory-mapped registers.
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The I/O operations are carried out exactly as requested. The caller is responsible
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for satisfying any alignment and I/O width restrictions that a PI System on a
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platform might require. For example on some platforms, width requests of
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EfiCpuIoWidthUint64 do not work. Misaligned buffers, on the other hand, will
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be handled by the driver.
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If Width is EfiCpuIoWidthUint8, EfiCpuIoWidthUint16, EfiCpuIoWidthUint32,
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or EfiCpuIoWidthUint64, then both Address and Buffer are incremented for
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each of the Count operations that is performed.
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If Width is EfiCpuIoWidthFifoUint8, EfiCpuIoWidthFifoUint16,
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EfiCpuIoWidthFifoUint32, or EfiCpuIoWidthFifoUint64, then only Buffer is
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incremented for each of the Count operations that is performed. The read or
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write operation is performed Count times on the same Address.
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If Width is EfiCpuIoWidthFillUint8, EfiCpuIoWidthFillUint16,
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EfiCpuIoWidthFillUint32, or EfiCpuIoWidthFillUint64, then only Address is
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incremented for each of the Count operations that is performed. The read or
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write operation is performed Count times from the first element of Buffer.
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@param[in] This A pointer to the EFI_CPU_IO_PROTOCOL instance.
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@param[in] Width Signifies the width of the I/O or Memory operation.
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@param[in] Address The base address of the I/O operation.
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@param[in] Count The number of I/O operations to perform. The number of
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bytes moved is Width size * Count, starting at Address.
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@param[in] Buffer For read operations, the destination buffer to store the results.
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For write operations, the source buffer from which to write data.
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@retval EFI_SUCCESS The data was read from or written to the PI system.
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@retval EFI_INVALID_PARAMETER Width is invalid for this PI system.
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@retval EFI_INVALID_PARAMETER Buffer is NULL.
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@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
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@retval EFI_UNSUPPORTED The address range specified by Address, Width,
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and Count is not valid for this PI system.
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**/
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EFI_STATUS
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EFIAPI
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CpuMemoryServiceWrite (
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IN EFI_CPU_IO_PROTOCOL *This,
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IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
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IN UINT64 Address,
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IN UINTN Count,
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IN VOID *Buffer
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)
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{
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EFI_STATUS Status;
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UINT8 InStride;
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UINT8 OutStride;
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EFI_CPU_IO_PROTOCOL_WIDTH OperationWidth;
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UINT8 *Uint8Buffer;
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Status = CpuIoCheckParameter (TRUE, Width, Address, Count, Buffer);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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//
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// Select loop based on the width of the transfer
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//
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InStride = mInStride[Width];
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OutStride = mOutStride[Width];
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OperationWidth = (EFI_CPU_IO_PROTOCOL_WIDTH) (Width & 0x03);
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for (Uint8Buffer = Buffer; Count > 0; Address += InStride, Uint8Buffer += OutStride, Count--) {
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if (OperationWidth == EfiCpuIoWidthUint8) {
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MmioWrite8 ((UINTN)Address, *Uint8Buffer);
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} else if (OperationWidth == EfiCpuIoWidthUint16) {
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MmioWrite16 ((UINTN)Address, *((UINT16 *)Uint8Buffer));
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} else if (OperationWidth == EfiCpuIoWidthUint32) {
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MmioWrite32 ((UINTN)Address, *((UINT32 *)Uint8Buffer));
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} else if (OperationWidth == EfiCpuIoWidthUint64) {
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MmioWrite64 ((UINTN)Address, *((UINT64 *)Uint8Buffer));
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}
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}
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return EFI_SUCCESS;
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}
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/**
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Reads I/O registers.
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The I/O operations are carried out exactly as requested. The caller is responsible
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for satisfying any alignment and I/O width restrictions that a PI System on a
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platform might require. For example on some platforms, width requests of
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EfiCpuIoWidthUint64 do not work. Misaligned buffers, on the other hand, will
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be handled by the driver.
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If Width is EfiCpuIoWidthUint8, EfiCpuIoWidthUint16, EfiCpuIoWidthUint32,
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or EfiCpuIoWidthUint64, then both Address and Buffer are incremented for
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each of the Count operations that is performed.
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If Width is EfiCpuIoWidthFifoUint8, EfiCpuIoWidthFifoUint16,
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EfiCpuIoWidthFifoUint32, or EfiCpuIoWidthFifoUint64, then only Buffer is
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incremented for each of the Count operations that is performed. The read or
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write operation is performed Count times on the same Address.
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If Width is EfiCpuIoWidthFillUint8, EfiCpuIoWidthFillUint16,
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EfiCpuIoWidthFillUint32, or EfiCpuIoWidthFillUint64, then only Address is
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incremented for each of the Count operations that is performed. The read or
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write operation is performed Count times from the first element of Buffer.
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@param[in] This A pointer to the EFI_CPU_IO_PROTOCOL instance.
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@param[in] Width Signifies the width of the I/O or Memory operation.
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@param[in] Address The base address of the I/O operation.
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@param[in] Count The number of I/O operations to perform. The number of
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bytes moved is Width size * Count, starting at Address.
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@param[out] Buffer For read operations, the destination buffer to store the results.
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For write operations, the source buffer from which to write data.
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@retval EFI_SUCCESS The data was read from or written to the PI system.
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@retval EFI_INVALID_PARAMETER Width is invalid for this PI system.
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@retval EFI_INVALID_PARAMETER Buffer is NULL.
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@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
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@retval EFI_UNSUPPORTED The address range specified by Address, Width,
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and Count is not valid for this PI system.
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**/
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EFI_STATUS
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EFIAPI
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CpuIoServiceRead (
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IN EFI_CPU_IO_PROTOCOL *This,
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IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
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IN UINT64 Address,
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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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EFI_STATUS Status;
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UINT8 InStride;
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UINT8 OutStride;
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EFI_CPU_IO_PROTOCOL_WIDTH OperationWidth;
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UINT8 *Uint8Buffer;
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Status = CpuIoCheckParameter (FALSE, Width, Address, Count, Buffer);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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//
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// Select loop based on the width of the transfer
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//
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InStride = mInStride[Width];
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OutStride = mOutStride[Width];
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OperationWidth = (EFI_CPU_IO_PROTOCOL_WIDTH) (Width & 0x03);
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//
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// Fifo operations supported for (mInStride[Width] == 0)
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//
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if (InStride == 0) {
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switch (OperationWidth) {
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case EfiCpuIoWidthUint8:
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IoReadFifo8 ((UINTN)Address, Count, Buffer);
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return EFI_SUCCESS;
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case EfiCpuIoWidthUint16:
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IoReadFifo16 ((UINTN)Address, Count, Buffer);
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return EFI_SUCCESS;
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case EfiCpuIoWidthUint32:
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IoReadFifo32 ((UINTN)Address, Count, Buffer);
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return EFI_SUCCESS;
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default:
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//
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// The CpuIoCheckParameter call above will ensure that this
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// path is not taken.
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//
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ASSERT (FALSE);
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break;
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}
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}
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for (Uint8Buffer = Buffer; Count > 0; Address += InStride, Uint8Buffer += OutStride, Count--) {
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if (OperationWidth == EfiCpuIoWidthUint8) {
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*Uint8Buffer = IoRead8 ((UINTN)Address);
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|
} else if (OperationWidth == EfiCpuIoWidthUint16) {
|
|
*((UINT16 *)Uint8Buffer) = IoRead16 ((UINTN)Address);
|
|
} else if (OperationWidth == EfiCpuIoWidthUint32) {
|
|
*((UINT32 *)Uint8Buffer) = IoRead32 ((UINTN)Address);
|
|
}
|
|
}
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
Write I/O registers.
|
|
|
|
The I/O operations are carried out exactly as requested. The caller is responsible
|
|
for satisfying any alignment and I/O width restrictions that a PI System on a
|
|
platform might require. For example on some platforms, width requests of
|
|
EfiCpuIoWidthUint64 do not work. Misaligned buffers, on the other hand, will
|
|
be handled by the driver.
|
|
|
|
If Width is EfiCpuIoWidthUint8, EfiCpuIoWidthUint16, EfiCpuIoWidthUint32,
|
|
or EfiCpuIoWidthUint64, then both Address and Buffer are incremented for
|
|
each of the Count operations that is performed.
|
|
|
|
If Width is EfiCpuIoWidthFifoUint8, EfiCpuIoWidthFifoUint16,
|
|
EfiCpuIoWidthFifoUint32, or EfiCpuIoWidthFifoUint64, then only Buffer is
|
|
incremented for each of the Count operations that is performed. The read or
|
|
write operation is performed Count times on the same Address.
|
|
|
|
If Width is EfiCpuIoWidthFillUint8, EfiCpuIoWidthFillUint16,
|
|
EfiCpuIoWidthFillUint32, or EfiCpuIoWidthFillUint64, then only Address is
|
|
incremented for each of the Count operations that is performed. The read or
|
|
write operation is performed Count times from the first element of Buffer.
|
|
|
|
@param[in] This A pointer to the EFI_CPU_IO_PROTOCOL instance.
|
|
@param[in] Width Signifies the width of the I/O or Memory operation.
|
|
@param[in] Address The base address of the I/O operation.
|
|
@param[in] Count The number of I/O operations to perform. The number of
|
|
bytes moved is Width size * Count, starting at Address.
|
|
@param[in] Buffer For read operations, the destination buffer to store the results.
|
|
For write operations, the source buffer from which to write data.
|
|
|
|
@retval EFI_SUCCESS The data was read from or written to the PI system.
|
|
@retval EFI_INVALID_PARAMETER Width is invalid for this PI system.
|
|
@retval EFI_INVALID_PARAMETER Buffer is NULL.
|
|
@retval EFI_UNSUPPORTED The Buffer is not aligned for the given Width.
|
|
@retval EFI_UNSUPPORTED The address range specified by Address, Width,
|
|
and Count is not valid for this PI system.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
CpuIoServiceWrite (
|
|
IN EFI_CPU_IO_PROTOCOL *This,
|
|
IN EFI_CPU_IO_PROTOCOL_WIDTH Width,
|
|
IN UINT64 Address,
|
|
IN UINTN Count,
|
|
IN VOID *Buffer
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
UINT8 InStride;
|
|
UINT8 OutStride;
|
|
EFI_CPU_IO_PROTOCOL_WIDTH OperationWidth;
|
|
UINT8 *Uint8Buffer;
|
|
|
|
//
|
|
// Make sure the parameters are valid
|
|
//
|
|
Status = CpuIoCheckParameter (FALSE, Width, Address, Count, Buffer);
|
|
if (EFI_ERROR (Status)) {
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Select loop based on the width of the transfer
|
|
//
|
|
InStride = mInStride[Width];
|
|
OutStride = mOutStride[Width];
|
|
OperationWidth = (EFI_CPU_IO_PROTOCOL_WIDTH) (Width & 0x03);
|
|
|
|
//
|
|
// Fifo operations supported for (mInStride[Width] == 0)
|
|
//
|
|
if (InStride == 0) {
|
|
switch (OperationWidth) {
|
|
case EfiCpuIoWidthUint8:
|
|
IoWriteFifo8 ((UINTN)Address, Count, Buffer);
|
|
return EFI_SUCCESS;
|
|
case EfiCpuIoWidthUint16:
|
|
IoWriteFifo16 ((UINTN)Address, Count, Buffer);
|
|
return EFI_SUCCESS;
|
|
case EfiCpuIoWidthUint32:
|
|
IoWriteFifo32 ((UINTN)Address, Count, Buffer);
|
|
return EFI_SUCCESS;
|
|
default:
|
|
//
|
|
// The CpuIoCheckParameter call above will ensure that this
|
|
// path is not taken.
|
|
//
|
|
ASSERT (FALSE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (Uint8Buffer = (UINT8 *)Buffer; Count > 0; Address += InStride, Uint8Buffer += OutStride, Count--) {
|
|
if (OperationWidth == EfiCpuIoWidthUint8) {
|
|
IoWrite8 ((UINTN)Address, *Uint8Buffer);
|
|
} else if (OperationWidth == EfiCpuIoWidthUint16) {
|
|
IoWrite16 ((UINTN)Address, *((UINT16 *)Uint8Buffer));
|
|
} else if (OperationWidth == EfiCpuIoWidthUint32) {
|
|
IoWrite32 ((UINTN)Address, *((UINT32 *)Uint8Buffer));
|
|
}
|
|
}
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
The user Entry Point for module CpuIo. The user code starts with this 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 entry point is executed successfully.
|
|
@retval other Some error occurs when executing this entry point.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
CpuIoInitialize (
|
|
IN EFI_HANDLE ImageHandle,
|
|
IN EFI_SYSTEM_TABLE *SystemTable
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
|
|
ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiCpuIoProtocolGuid);
|
|
Status = gBS->InstallMultipleProtocolInterfaces (
|
|
&mHandle,
|
|
&gEfiCpuIoProtocolGuid, &mCpuIo,
|
|
NULL
|
|
);
|
|
ASSERT_EFI_ERROR (Status);
|
|
|
|
return Status;
|
|
}
|