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[edk2,6/6] MdeModulePkg: use 64 KB granularity for runtime allocations on AArch64

Message ID 1423414278-8455-7-git-send-email-ard.biesheuvel@linaro.org
State New
Headers show

Commit Message

Ard Biesheuvel Feb. 8, 2015, 4:51 p.m. UTC 
On AArch64, the OS can choose to run with a page size of 64 KB,
making it cumbersome to deal with UEFI reserved memory regions
whose boundaries are not 64 KB aligned.

So increase the allocation granularity for runtime regions to
64 KB.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 MdeModulePkg/Core/Dxe/Mem/Imem.h | 9 +++++++++
 1 file changed, 9 insertions(+)
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Patch

diff --git a/MdeModulePkg/Core/Dxe/Mem/Imem.h b/MdeModulePkg/Core/Dxe/Mem/Imem.h
index d09ff3c5220f..16077d825deb 100644
--- a/MdeModulePkg/Core/Dxe/Mem/Imem.h
+++ b/MdeModulePkg/Core/Dxe/Mem/Imem.h
@@ -22,6 +22,15 @@  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #define EFI_ACPI_RUNTIME_PAGE_ALLOCATION_ALIGNMENT  (EFI_PAGE_SIZE * 2)
 #define DEFAULT_PAGE_ALLOCATION                     (EFI_PAGE_SIZE * 2)
 
+#elif defined (MDE_CPU_AARCH64)
+///
+/// 64-bit ARM systems allow the OS to execute with 64 KB page size,
+/// so for improved interoperability with the firmware, align the
+/// runtime regions to 64 KB as well
+///
+#define EFI_ACPI_RUNTIME_PAGE_ALLOCATION_ALIGNMENT  (SIZE_64KB)
+#define DEFAULT_PAGE_ALLOCATION                     (EFI_PAGE_SIZE)
+
 #else
 ///
 /// For genric EFI machines make the default allocations 4K aligned