    /* SPDX-License-Identifier: MIT */
    /******************************************************************************
     * hvm/hvm_info_table.h
     *
     * HVM parameter and information table, written into guest memory map.
     *
     * Copyright (c) 2006, Keir Fraser
     */

    #ifndef __XEN_PUBLIC_HVM_HVM_INFO_TABLE_H__
    #define __XEN_PUBLIC_HVM_HVM_INFO_TABLE_H__

    #define HVM_INFO_PFN         0x09F
    #define HVM_INFO_OFFSET      0x800
    #define HVM_INFO_PADDR       ((HVM_INFO_PFN << 12) + HVM_INFO_OFFSET)

    /* Maximum we can support with current vLAPIC ID mapping. */
    #define HVM_MAX_VCPUS        128

    /*
     * In some cases SMP HVM guests may require knowledge of Xen's idea of vCPU ids
     * for their vCPUs. For example, HYPERVISOR_vcpu_op and some EVTCHNOP_*
     * hypercalls take vcpu id as a parameter. It is valid for HVM guests to assume
     * that Xen's vCPU id always equals to ACPI (not APIC!) id in MADT table which
     * is always present for SMP guests.
     */

    struct hvm_info_table {
        char        signature[8]; /* "HVM INFO" */
        uint32_t    length;
        uint8_t     checksum;

        /* Should firmware build APIC descriptors (APIC MADT / MP BIOS)? */
        uint8_t     apic_mode;

        /* How many CPUs does this domain have? */
        uint32_t    nr_vcpus;

        /*
         * MEMORY MAP provided by HVM domain builder.
         * Notes:
         *  1. page_to_phys(x) = x << 12
         *  2. If a field is zero, the corresponding range does not exist.
         */
        /*
         *  0x0 to page_to_phys(low_mem_pgend)-1:
         *    RAM below 4GB (except for VGA hole 0xA0000-0xBFFFF)
         */
        uint32_t    low_mem_pgend;
        /*
         *  page_to_phys(reserved_mem_pgstart) to 0xFFFFFFFF:
         *    Reserved for special memory mappings
         */
        uint32_t    reserved_mem_pgstart;
        /*
         *  0x100000000 to page_to_phys(high_mem_pgend)-1:
         *    RAM above 4GB
         */
        uint32_t    high_mem_pgend;

        /* Bitmap of which CPUs are online at boot time. */
        uint8_t     vcpu_online[(HVM_MAX_VCPUS + 7)/8];
    };

    #endif /* __XEN_PUBLIC_HVM_HVM_INFO_TABLE_H__ */