mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
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90 lines
3.0 KiB
Rust
90 lines
3.0 KiB
Rust
// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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//
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// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE-BSD-3-Clause file.
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use vm_memory::{GuestAddress, GuestUsize};
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/*
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Memory layout documentation and constants
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~~~~~~ ~~~~~~ ~~~~~~~~~~~~~ ~~~ ~~~~~~~~~
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Constants are in order and grouped by range. Take care to update all references
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when making changes and keep them in order.
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*/
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// ** Low RAM (start: 0, length: 640KiB) **
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pub const LOW_RAM_START: GuestAddress = GuestAddress(0x0);
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// == Fixed addresses within the "Low RAM" range: ==
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// Initial GDT/IDT needed to boot kernel
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pub const BOOT_GDT_START: GuestAddress = GuestAddress(0x500);
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pub const BOOT_IDT_START: GuestAddress = GuestAddress(0x520);
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/// The 'zero page', a.k.a linux kernel bootparams.
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pub const ZERO_PAGE_START: GuestAddress = GuestAddress(0x7000);
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/// Initial stack for the boot CPU.
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pub const BOOT_STACK_START: GuestAddress = GuestAddress(0x8000);
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pub const BOOT_STACK_POINTER: GuestAddress = GuestAddress(0x8ff0);
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// Initial pagetables.
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pub const PML4_START: GuestAddress = GuestAddress(0x9000);
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pub const PDPTE_START: GuestAddress = GuestAddress(0xa000);
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pub const PDE_START: GuestAddress = GuestAddress(0xb000);
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/// Kernel command line start address.
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pub const CMDLINE_START: GuestAddress = GuestAddress(0x20000);
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/// Kernel command line start address maximum size.
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pub const CMDLINE_MAX_SIZE: usize = 0x10000;
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// MPTABLE, describing VCPUS.
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pub const MPTABLE_START: GuestAddress = GuestAddress(0x9fc00);
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// == End of "Low RAM" range. ==
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// ** EBDA reserved area (start: 640KiB, length: 384KiB) **
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pub const EBDA_START: GuestAddress = GuestAddress(0xa0000);
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// == Fixed constants within the "EBDA" range ==
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// ACPI RSDP table
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pub const RSDP_POINTER: GuestAddress = EBDA_START;
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// == End of "EBDA" range ==
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// ** High RAM (start: 1MiB, length: 3071MiB) **
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pub const HIGH_RAM_START: GuestAddress = GuestAddress(0x100000);
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// == No fixed addresses in the "High RAM" range ==
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// ** 32-bit reserved area (start: 3GiB, length: 1GiB) **
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pub const MEM_32BIT_RESERVED_START: GuestAddress = GuestAddress(0xc000_0000);
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pub const MEM_32BIT_RESERVED_SIZE: GuestUsize = (1024 << 20);
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// == Fixed constants within the "32-bit reserved" range ==
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// Sub range: 32-bit PCI devices (start: 3GiB, length: 768Mib)
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pub const MEM_32BIT_DEVICES_START: GuestAddress = MEM_32BIT_RESERVED_START;
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pub const MEM_32BIT_DEVICES_SIZE: GuestUsize = (768 << 20);
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// IOAPIC
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pub const IOAPIC_START: GuestAddress = GuestAddress(0xfec0_0000);
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pub const IOAPIC_SIZE: GuestUsize = 0x20;
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// APIC
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pub const APIC_START: GuestAddress = GuestAddress(0xfee0_0000);
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/// Address for the TSS setup.
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pub const KVM_TSS_ADDRESS: GuestAddress = GuestAddress(0xfffb_d000);
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// == End of "32-bit reserved" range. ==
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// ** 64-bit RAM start (start: 4GiB, length: varies) **
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pub const RAM_64BIT_START: GuestAddress = GuestAddress(0x1_0000_0000);
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