143 lines
6.2 KiB
C
143 lines
6.2 KiB
C
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/* SPDX-License-Identifier: MIT */
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/*
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* Copyright (c) 2016, Citrix Systems, Inc.
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*/
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#ifndef __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__
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#define __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__
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/*
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* Start of day structure passed to PVH guests and to HVM guests in %ebx.
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*
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* NOTE: nothing will be loaded at physical address 0, so a 0 value in any
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* of the address fields should be treated as not present.
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*
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* 0 +----------------+
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* | magic | Contains the magic value XEN_HVM_START_MAGIC_VALUE
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* | | ("xEn3" with the 0x80 bit of the "E" set).
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* 4 +----------------+
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* | version | Version of this structure. Current version is 1. New
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* | | versions are guaranteed to be backwards-compatible.
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* 8 +----------------+
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* | flags | SIF_xxx flags.
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* 12 +----------------+
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* | nr_modules | Number of modules passed to the kernel.
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* 16 +----------------+
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* | modlist_paddr | Physical address of an array of modules
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* | | (layout of the structure below).
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* 24 +----------------+
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* | cmdline_paddr | Physical address of the command line,
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* | | a zero-terminated ASCII string.
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* 32 +----------------+
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* | rsdp_paddr | Physical address of the RSDP ACPI data structure.
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* 40 +----------------+
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* | memmap_paddr | Physical address of the (optional) memory map. Only
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* | | present in version 1 and newer of the structure.
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* 48 +----------------+
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* | memmap_entries | Number of entries in the memory map table. Zero
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* | | if there is no memory map being provided. Only
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* | | present in version 1 and newer of the structure.
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* 52 +----------------+
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* | reserved | Version 1 and newer only.
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* 56 +----------------+
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*
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* The layout of each entry in the module structure is the following:
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*
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* 0 +----------------+
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* | paddr | Physical address of the module.
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* 8 +----------------+
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* | size | Size of the module in bytes.
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* 16 +----------------+
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* | cmdline_paddr | Physical address of the command line,
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* | | a zero-terminated ASCII string.
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* 24 +----------------+
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* | reserved |
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* 32 +----------------+
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*
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* The layout of each entry in the memory map table is as follows:
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*
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* 0 +----------------+
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* | addr | Base address
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* 8 +----------------+
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* | size | Size of mapping in bytes
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* 16 +----------------+
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* | type | Type of mapping as defined between the hypervisor
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* | | and guest. See XEN_HVM_MEMMAP_TYPE_* values below.
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* 20 +----------------|
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* | reserved |
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* 24 +----------------+
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*
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* The address and sizes are always a 64bit little endian unsigned integer.
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*
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* NB: Xen on x86 will always try to place all the data below the 4GiB
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* boundary.
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*
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* Version numbers of the hvm_start_info structure have evolved like this:
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*
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* Version 0: Initial implementation.
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*
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* Version 1: Added the memmap_paddr/memmap_entries fields (plus 4 bytes of
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* padding) to the end of the hvm_start_info struct. These new
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* fields can be used to pass a memory map to the guest. The
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* memory map is optional and so guests that understand version 1
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* of the structure must check that memmap_entries is non-zero
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* before trying to read the memory map.
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*/
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#define XEN_HVM_START_MAGIC_VALUE 0x336ec578
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/*
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* The values used in the type field of the memory map table entries are
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* defined below and match the Address Range Types as defined in the "System
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* Address Map Interfaces" section of the ACPI Specification. Please refer to
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* section 15 in version 6.2 of the ACPI spec: http://uefi.org/specifications
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*/
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#define XEN_HVM_MEMMAP_TYPE_RAM 1
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#define XEN_HVM_MEMMAP_TYPE_RESERVED 2
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#define XEN_HVM_MEMMAP_TYPE_ACPI 3
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#define XEN_HVM_MEMMAP_TYPE_NVS 4
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#define XEN_HVM_MEMMAP_TYPE_UNUSABLE 5
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#define XEN_HVM_MEMMAP_TYPE_DISABLED 6
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#define XEN_HVM_MEMMAP_TYPE_PMEM 7
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/*
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* C representation of the x86/HVM start info layout.
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*
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* The canonical definition of this layout is above, this is just a way to
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* represent the layout described there using C types.
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*/
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struct hvm_start_info {
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uint32_t magic; /* Contains the magic value 0x336ec578 */
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/* ("xEn3" with the 0x80 bit of the "E" set).*/
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uint32_t version; /* Version of this structure. */
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uint32_t flags; /* SIF_xxx flags. */
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uint32_t nr_modules; /* Number of modules passed to the kernel. */
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uint64_t modlist_paddr; /* Physical address of an array of */
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/* hvm_modlist_entry. */
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uint64_t cmdline_paddr; /* Physical address of the command line. */
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uint64_t rsdp_paddr; /* Physical address of the RSDP ACPI data */
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/* structure. */
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/* All following fields only present in version 1 and newer */
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uint64_t memmap_paddr; /* Physical address of an array of */
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/* hvm_memmap_table_entry. */
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uint32_t memmap_entries; /* Number of entries in the memmap table. */
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/* Value will be zero if there is no memory */
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/* map being provided. */
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uint32_t reserved; /* Must be zero. */
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};
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struct hvm_modlist_entry {
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uint64_t paddr; /* Physical address of the module. */
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uint64_t size; /* Size of the module in bytes. */
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uint64_t cmdline_paddr; /* Physical address of the command line. */
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uint64_t reserved;
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};
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struct hvm_memmap_table_entry {
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uint64_t addr; /* Base address of the memory region */
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uint64_t size; /* Size of the memory region in bytes */
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uint32_t type; /* Mapping type */
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uint32_t reserved; /* Must be zero for Version 1. */
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};
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#endif /* __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__ */
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