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aarch64: Reserve a hole in 32-bit space

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The reserved space is for devices.
Some devices (like TPM) require arbitrary addresses close to 4GiB.

Signed-off-by: Michael Zhao <michael.zhao@arm.com>
This commit is contained in:
Michael Zhao
2022-03-30 10:22:26 +08:00
committed by Xin Wang
parent a3dbc3b415
commit 848d88c122
3 changed files with 54 additions and 16 deletions
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arch/src/aarch64/layout.rs
+15 -1
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@@ -3,7 +3,7 @@
// SPDX-License-Identifier: Apache-2.0
//
// Memory layout of Aarch64 guest:
// Memory layout of AArch64 guest:
//
// Physical +---------------------------------------------------------------+
// address | |
@@ -20,6 +20,13 @@
// | DRAM |
// | |
// | |
// 4GB +---------------------------------------------------------------+
// | 32-bit devices hole |
// 4GB-64M +---------------------------------------------------------------+
// | |
// | |
// | DRAM |
// | |
// | |
// 1GB +---------------------------------------------------------------+
// | |
@@ -88,6 +95,13 @@ pub const PCI_MMIO_CONFIG_SIZE_PER_SEGMENT: u64 = 4096 * 256;
/// Start of RAM.
pub const RAM_START: GuestAddress = GuestAddress(0x4000_0000);
/// 32-bit reserved area: 64MiB before 4GiB
pub const MEM_32BIT_RESERVED_START: GuestAddress = GuestAddress(0xfc00_0000);
pub const MEM_32BIT_RESERVED_SIZE: u64 = 0x0400_0000;
/// Start of 64-bit RAM.
pub const RAM_64BIT_START: GuestAddress = GuestAddress(0x1_0000_0000);
/// Kernel command line maximum size.
/// As per `arch/arm64/include/uapi/asm/setup.h`.
pub const CMDLINE_MAX_SIZE: usize = 2048;