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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2018-12-07 11:27:32 +0100 |
|---|---|---|
| committer | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2018-12-20 11:01:38 +0100 |
| commit | 67b8f806d22abfe9c16ec8b29a8d19885298ba1d (patch) | |
| tree | 74e3d1fe686a65774dac9075aff25f3171f57257 /MdePkg/Include/Arm | |
| parent | 5c8bc8be9e5e4665ab7e31558db9e3fe9990a13e (diff) | |
| download | edk2-67b8f806d22abfe9c16ec8b29a8d19885298ba1d.tar.gz edk2-67b8f806d22abfe9c16ec8b29a8d19885298ba1d.tar.bz2 edk2-67b8f806d22abfe9c16ec8b29a8d19885298ba1d.zip | |
MdePkg/Base: introduce MAX_ALLOC_ADDRESS
On some architectures, the maximum representable address deviates from
the virtual address range that is accessible by the firmware at boot
time. For instance, on AArch64, UEFI mandates a 4 KB page size, which
limits the address space to 48 bits, while more than that may be
populated on a particular platform, for use by the OS.
So introduce a new macro MAX_ALLOC_ADDRESS, which represent the maximum
address the firmware should take into account when allocating memory
ranges that need to be accessible by the CPU at boot time.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Diffstat (limited to 'MdePkg/Include/Arm')
| -rw-r--r-- | MdePkg/Include/Arm/ProcessorBind.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/MdePkg/Include/Arm/ProcessorBind.h b/MdePkg/Include/Arm/ProcessorBind.h index 8cca0f3bb0..16a61fc7a3 100644 --- a/MdePkg/Include/Arm/ProcessorBind.h +++ b/MdePkg/Include/Arm/ProcessorBind.h @@ -149,6 +149,11 @@ typedef INT32 INTN; #define MAX_ADDRESS 0xFFFFFFFF
///
+/// Maximum usable address at boot time
+///
+#define MAX_ALLOC_ADDRESS MAX_ALLOC_ADDRESS
+
+///
/// Maximum legal ARM INTN and UINTN values.
///
#define MAX_INTN ((INTN)0x7FFFFFFF)
|