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