diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-08-24 20:13:10 +0100 |
|---|---|---|
| committer | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-08-29 17:54:54 +0100 |
| commit | 4b4104d87e28a56a14d89289e960a92618ce5621 (patch) | |
| tree | 236cbec0e91769f006383777bb6998c1f2240199 /ArmPkg | |
| parent | deef290f95e0df80549d2a6cbd7edae104c82709 (diff) | |
| download | edk2-4b4104d87e28a56a14d89289e960a92618ce5621.tar.gz edk2-4b4104d87e28a56a14d89289e960a92618ce5621.tar.bz2 edk2-4b4104d87e28a56a14d89289e960a92618ce5621.zip | |
ArmPkg/ArmDmaLib: implement DmaAllocateAlignedBuffer()
Implement the new DmaLib routine that returns DMA'able buffers
at a specified minimum alignment.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Diffstat (limited to 'ArmPkg')
| -rw-r--r-- | ArmPkg/Library/ArmDmaLib/ArmDmaLib.c | 42 |
1 files changed, 39 insertions, 3 deletions
diff --git a/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c b/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c index e12bda4c2d..2a8cf0fe21 100644 --- a/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c +++ b/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c @@ -285,20 +285,56 @@ DmaAllocateBuffer ( 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
+ )
+{
EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;
VOID *Allocation;
UINT64 MemType;
UNCACHED_ALLOCATION *Alloc;
EFI_STATUS Status;
- if (HostAddress == NULL) {
+ if (Alignment == 0) {
+ Alignment = EFI_PAGE_SIZE;
+ }
+
+ if (HostAddress == NULL ||
+ (Alignment & (Alignment - 1)) != 0) {
return EFI_INVALID_PARAMETER;
}
if (MemoryType == EfiBootServicesData) {
- Allocation = AllocatePages (Pages);
+ Allocation = AllocateAlignedPages (Pages, Alignment);
} else if (MemoryType == EfiRuntimeServicesData) {
- Allocation = AllocateRuntimePages (Pages);
+ Allocation = AllocateAlignedRuntimePages (Pages, Alignment);
} else {
return EFI_INVALID_PARAMETER;
}
|