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      1 /******************************************************************************
      2  * hvm/hvm_info_table.h
      3  *
      4  * HVM parameter and information table, written into guest memory map.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a copy
      7  * of this software and associated documentation files (the "Software"), to
      8  * deal in the Software without restriction, including without limitation the
      9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
     10  * sell copies of the Software, and to permit persons to whom the Software is
     11  * furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     22  * DEALINGS IN THE SOFTWARE.
     23  *
     24  * Copyright (c) 2006, Keir Fraser
     25  */
     26 
     27 #ifndef __XEN_PUBLIC_HVM_HVM_INFO_TABLE_H__
     28 #define __XEN_PUBLIC_HVM_HVM_INFO_TABLE_H__
     29 
     30 #define HVM_INFO_PFN         0x09F
     31 #define HVM_INFO_OFFSET      0x800
     32 #define HVM_INFO_PADDR       ((HVM_INFO_PFN << 12) + HVM_INFO_OFFSET)
     33 
     34 /* Maximum we can support with current vLAPIC ID mapping. */
     35 #define HVM_MAX_VCPUS        128
     36 
     37 /*
     38  * In some cases SMP HVM guests may require knowledge of Xen's idea of vCPU ids
     39  * for their vCPUs. For example, HYPERVISOR_vcpu_op and some EVTCHNOP_*
     40  * hypercalls take vcpu id as a parameter. It is valid for HVM guests to assume
     41  * that Xen's vCPU id always equals to ACPI (not APIC!) id in MADT table which
     42  * is always present for SMP guests.
     43  */
     44 
     45 struct hvm_info_table {
     46     char        signature[8]; /* "HVM INFO" */
     47     uint32_t    length;
     48     uint8_t     checksum;
     49 
     50     /* Should firmware build APIC descriptors (APIC MADT / MP BIOS)? */
     51     uint8_t     apic_mode;
     52 
     53     /* How many CPUs does this domain have? */
     54     uint32_t    nr_vcpus;
     55 
     56     /*
     57      * MEMORY MAP provided by HVM domain builder.
     58      * Notes:
     59      *  1. page_to_phys(x) = x << 12
     60      *  2. If a field is zero, the corresponding range does not exist.
     61      */
     62     /*
     63      *  0x0 to page_to_phys(low_mem_pgend)-1:
     64      *    RAM below 4GB (except for VGA hole 0xA0000-0xBFFFF)
     65      */
     66     uint32_t    low_mem_pgend;
     67     /*
     68      *  page_to_phys(reserved_mem_pgstart) to 0xFFFFFFFF:
     69      *    Reserved for special memory mappings
     70      */
     71     uint32_t    reserved_mem_pgstart;
     72     /*
     73      *  0x100000000 to page_to_phys(high_mem_pgend)-1:
     74      *    RAM above 4GB
     75      */
     76     uint32_t    high_mem_pgend;
     77 
     78     /* Bitmap of which CPUs are online at boot time. */
     79     uint8_t     vcpu_online[(HVM_MAX_VCPUS + 7)/8];
     80 };
     81 
     82 #endif /* __XEN_PUBLIC_HVM_HVM_INFO_TABLE_H__ */
     83