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ArmPlatformPkg/HdLcdArmVExpressLib: use write-combine mapping for VRAM

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Replace the uncached memory mapping of the framebuffer with a write-
combining one. This improves performance, and avoids issues with
unaligned accesses and DC ZVA instructions performed by the accelerated
memcpy/memset routines.

Instead of manipulating the memory attributes directly, use the
SetMemorySpaceAttributes() DXE services, which validates the attributes
against the capabilities of the region before making the actual change.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Ard Biesheuvel 2017-04-06 12:59:38 +01:00
parent 1fe11382db
commit 14fa71247c
2 changed files with 6 additions and 9 deletions
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12
ArmPlatformPkg/ArmVExpressPkg/Library/HdLcdArmVExpressLib/HdLcdArmVExpress.c
View File

@ -18,11 +18,11 @@
#include <Library/IoLib.h>
#include <Library/PcdLib.h>
#include <Library/DebugLib.h>
#include <Library/DxeServicesTableLib.h>
#include <Library/LcdPlatformLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/Cpu.h>
#include <Protocol/EdidDiscovered.h>
#include <Protocol/EdidActive.h>
@ -119,7 +119,6 @@ LcdPlatformGetVram (
)
{
EFI_STATUS Status;
EFI_CPU_ARCH_PROTOCOL *Cpu;
EFI_ALLOCATE_TYPE AllocationType;
// Set the vram size
@ -138,12 +137,9 @@ LcdPlatformGetVram (
return Status;
}
// Ensure the Cpu architectural protocol is already installed
Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&Cpu);
ASSERT_EFI_ERROR(Status);
// Mark the VRAM as un-cacheable. The VRAM is inside the DRAM, which is cacheable.
Status = Cpu->SetMemoryAttributes (Cpu, *VramBaseAddress, *VramSize, EFI_MEMORY_UC);
// Mark the VRAM as write-combining. The VRAM is inside the DRAM, which is cacheable.
Status = gDS->SetMemorySpaceAttributes (*VramBaseAddress, *VramSize,
EFI_MEMORY_WC);
ASSERT_EFI_ERROR(Status);
if (EFI_ERROR(Status)) {
gBS->FreePages (*VramBaseAddress, EFI_SIZE_TO_PAGES (*VramSize));

3
ArmPlatformPkg/ArmVExpressPkg/Library/HdLcdArmVExpressLib/HdLcdArmVExpressLib.inf
View File

@ -32,8 +32,9 @@ HdLcdArmVExpress.c
ArmPlatformPkg/ArmVExpressPkg/ArmVExpressPkg.dec
[LibraryClasses]
BaseLib
ArmPlatformSysConfigLib
BaseLib
DxeServicesTableLib
[Protocols]
gEfiEdidDiscoveredProtocolGuid # Produced