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/** @file
Generic ARM implementation of DmaLib.h
Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi.h>
#include <Library/DebugLib.h>
#include <Library/DmaLib.h>
#include <Library/MemoryAllocationLib.h>
STATIC
PHYSICAL_ADDRESS
HostToDeviceAddress (
IN VOID *Address
)
{
return (PHYSICAL_ADDRESS)(UINTN)Address + PcdGet64 (PcdDmaDeviceOffset);
}
/**
Provides the DMA controller-specific addresses needed to access system memory.
Operation is relative to the DMA bus master.
@param Operation Indicates if the bus master is going to read or write to system memory.
@param HostAddress The system memory address to map to the DMA controller.
@param NumberOfBytes On input the number of bytes to map. On output the number of bytes
that were mapped.
@param DeviceAddress The resulting map address for the bus master controller to use to
access the hosts HostAddress.
@param Mapping A resulting value to pass to Unmap().
@retval EFI_SUCCESS The range was mapped for the returned NumberOfBytes.
@retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common buffer.
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
@retval EFI_DEVICE_ERROR The system hardware could not map the requested address.
**/
EFI_STATUS
EFIAPI
DmaMap (
IN DMA_MAP_OPERATION Operation,
IN VOID *HostAddress,
IN OUT UINTN *NumberOfBytes,
OUT PHYSICAL_ADDRESS *DeviceAddress,
OUT VOID **Mapping
)
{
if ((HostAddress == NULL) ||
(NumberOfBytes == NULL) ||
(DeviceAddress == NULL) ||
(Mapping == NULL))
{
return EFI_INVALID_PARAMETER;
}
*DeviceAddress = HostToDeviceAddress (HostAddress);
*Mapping = NULL;
return EFI_SUCCESS;
}
/**
Completes the DmaMapBusMasterRead(), DmaMapBusMasterWrite(), or DmaMapBusMasterCommonBuffer()
operation and releases any corresponding resources.
@param Mapping The mapping value returned from DmaMap*().
@retval EFI_SUCCESS The range was unmapped.
@retval EFI_DEVICE_ERROR The data was not committed to the target system memory.
**/
EFI_STATUS
EFIAPI
DmaUnmap (
IN VOID *Mapping
)
{
return EFI_SUCCESS;
}
/**
Allocates pages that are suitable for an DmaMap() of type MapOperationBusMasterCommonBuffer.
mapping.
@param MemoryType The type of memory to allocate, EfiBootServicesData or
EfiRuntimeServicesData.
@param Pages The number of pages to allocate.
@param HostAddress A pointer to store the base system memory address of the
allocated range.
@retval EFI_SUCCESS The requested memory pages were allocated.
@retval EFI_UNSUPPORTED Attributes is unsupported. The only legal attribute bits are
MEMORY_WRITE_COMBINE and MEMORY_CACHED.
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
@retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
**/
EFI_STATUS
EFIAPI
DmaAllocateBuffer (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
OUT VOID **HostAddress
)
{
return DmaAllocateAlignedBuffer (MemoryType, Pages, 0, HostAddress);
}
/**
Allocates pages that are suitable for an DmaMap() of type
MapOperationBusMasterCommonBuffer mapping, at the requested alignment.
@param MemoryType The type of memory to allocate, EfiBootServicesData or
EfiRuntimeServicesData.
@param Pages The number of pages to allocate.
@param Alignment Alignment in bytes of the base of the returned
buffer (must be a power of 2)
@param HostAddress A pointer to store the base system memory address of the
allocated range.
@retval EFI_SUCCESS The requested memory pages were allocated.
@retval EFI_UNSUPPORTED Attributes is unsupported. The only legal attribute bits are
MEMORY_WRITE_COMBINE and MEMORY_CACHED.
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
@retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
**/
EFI_STATUS
EFIAPI
DmaAllocateAlignedBuffer (
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
IN UINTN Alignment,
OUT VOID **HostAddress
)
{
if (Alignment == 0) {
Alignment = EFI_PAGE_SIZE;
}
if ((HostAddress == NULL) ||
((Alignment & (Alignment - 1)) != 0))
{
return EFI_INVALID_PARAMETER;
}
//
// The only valid memory types are EfiBootServicesData and EfiRuntimeServicesData
//
if (MemoryType == EfiBootServicesData) {
*HostAddress = AllocateAlignedPages (Pages, Alignment);
} else if (MemoryType == EfiRuntimeServicesData) {
*HostAddress = AllocateAlignedRuntimePages (Pages, Alignment);
} else {
return EFI_INVALID_PARAMETER;
}
if (*HostAddress == NULL) {
return EFI_OUT_OF_RESOURCES;
}
return EFI_SUCCESS;
}
/**
Frees memory that was allocated with DmaAllocateBuffer().
@param Pages The number of pages to free.
@param HostAddress The base system memory address of the allocated range.
@retval EFI_SUCCESS The requested memory pages were freed.
@retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages
was not allocated with DmaAllocateBuffer().
**/
EFI_STATUS
EFIAPI
DmaFreeBuffer (
IN UINTN Pages,
IN VOID *HostAddress
)
{
if (HostAddress == NULL) {
return EFI_INVALID_PARAMETER;
}
FreePages (HostAddress, Pages);
return EFI_SUCCESS;
}
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