From 67b8f806d22abfe9c16ec8b29a8d19885298ba1d Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Fri, 7 Dec 2018 11:27:32 +0100 Subject: [PATCH] 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 Reviewed-by: Liming Gao --- MdePkg/Include/AArch64/ProcessorBind.h | 5 +++++ MdePkg/Include/Arm/ProcessorBind.h | 5 +++++ MdePkg/Include/Ebc/ProcessorBind.h | 5 +++++ MdePkg/Include/Ia32/ProcessorBind.h | 5 +++++ MdePkg/Include/X64/ProcessorBind.h | 5 +++++ 5 files changed, 25 insertions(+) diff --git a/MdePkg/Include/AArch64/ProcessorBind.h b/MdePkg/Include/AArch64/ProcessorBind.h index 968c18f915..f4a544b34d 100644 --- a/MdePkg/Include/AArch64/ProcessorBind.h +++ b/MdePkg/Include/AArch64/ProcessorBind.h @@ -142,6 +142,11 @@ typedef INT64 INTN; /// #define MAX_ADDRESS 0xFFFFFFFFFFFFFFFFULL +/// +/// Maximum usable address at boot time (48 bits using 4 KB pages) +/// +#define MAX_ALLOC_ADDRESS 0xFFFFFFFFFFFFULL + /// /// Maximum legal AArch64 INTN and UINTN values. /// 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 @@ -148,6 +148,11 @@ 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. /// diff --git a/MdePkg/Include/Ebc/ProcessorBind.h b/MdePkg/Include/Ebc/ProcessorBind.h index 5217cfd97e..45beb75728 100644 --- a/MdePkg/Include/Ebc/ProcessorBind.h +++ b/MdePkg/Include/Ebc/ProcessorBind.h @@ -103,6 +103,11 @@ typedef unsigned long UINTN; /// #define MAX_ADDRESS ((UINTN)(~0ULL >> (64 - sizeof (INTN) * 8))) +/// +/// Maximum usable address at boot time (48 bits using 4 KB pages) +/// +#define MAX_ALLOC_ADDRESS MAX_ADDRESS + /// /// Maximum legal EBC INTN and UINTN values. /// diff --git a/MdePkg/Include/Ia32/ProcessorBind.h b/MdePkg/Include/Ia32/ProcessorBind.h index 8e4de7029c..71d53e2543 100644 --- a/MdePkg/Include/Ia32/ProcessorBind.h +++ b/MdePkg/Include/Ia32/ProcessorBind.h @@ -246,6 +246,11 @@ typedef INT32 INTN; /// #define MAX_ADDRESS 0xFFFFFFFF +/// +/// Maximum usable address at boot time +/// +#define MAX_ALLOC_ADDRESS MAX_ADDRESS + /// /// Maximum legal IA-32 INTN and UINTN values. /// diff --git a/MdePkg/Include/X64/ProcessorBind.h b/MdePkg/Include/X64/ProcessorBind.h index e425428587..1c04090c7d 100644 --- a/MdePkg/Include/X64/ProcessorBind.h +++ b/MdePkg/Include/X64/ProcessorBind.h @@ -260,6 +260,11 @@ typedef INT64 INTN; /// #define MAX_ADDRESS 0xFFFFFFFFFFFFFFFFULL +/// +/// Maximum usable address at boot time +/// +#define MAX_ALLOC_ADDRESS MAX_ADDRESS + /// /// Maximum legal x64 INTN and UINTN values. /// -- 2.39.2