The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/features.h

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    1 /******************************************************************************
    2  * features.h
    3  * 
    4  * Feature flags, reported by XENVER_get_features.
    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 <keir@xensource.com>
   25  */
   26 
   27 #ifndef __XEN_PUBLIC_FEATURES_H__
   28 #define __XEN_PUBLIC_FEATURES_H__
   29 
   30 /*
   31  * If set, the guest does not need to write-protect its pagetables, and can
   32  * update them via direct writes.
   33  */
   34 #define XENFEAT_writable_page_tables       0
   35 
   36 /*
   37  * If set, the guest does not need to write-protect its segment descriptor
   38  * tables, and can update them via direct writes.
   39  */
   40 #define XENFEAT_writable_descriptor_tables 1
   41 
   42 /*
   43  * If set, translation between the guest's 'pseudo-physical' address space
   44  * and the host's machine address space are handled by the hypervisor. In this
   45  * mode the guest does not need to perform phys-to/from-machine translations
   46  * when performing page table operations.
   47  */
   48 #define XENFEAT_auto_translated_physmap    2
   49 
   50 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
   51 #define XENFEAT_supervisor_mode_kernel     3
   52 
   53 /*
   54  * If set, the guest does not need to allocate x86 PAE page directories
   55  * below 4GB. This flag is usually implied by auto_translated_physmap.
   56  */
   57 #define XENFEAT_pae_pgdir_above_4gb        4
   58 
   59 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */
   60 #define XENFEAT_mmu_pt_update_preserve_ad  5
   61 
   62 /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */
   63 #define XENFEAT_highmem_assist             6
   64 
   65 /*
   66  * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel
   67  * available pte bits.
   68  */
   69 #define XENFEAT_gnttab_map_avail_bits      7
   70 
   71 /* x86: Does this Xen host support the HVM callback vector type? */
   72 #define XENFEAT_hvm_callback_vector        8
   73 
   74 /* x86: pvclock algorithm is safe to use on HVM */
   75 #define XENFEAT_hvm_safe_pvclock           9
   76 
   77 /* x86: pirq can be used by HVM guests */
   78 #define XENFEAT_hvm_pirqs                 10
   79 
   80 /* operation as Dom0 is supported */
   81 #define XENFEAT_dom0                      11
   82 
   83 #define XENFEAT_NR_SUBMAPS 1
   84 
   85 #endif /* __XEN_PUBLIC_FEATURES_H__ */
   86 
   87 /*
   88  * Local variables:
   89  * mode: C
   90  * c-set-style: "BSD"
   91  * c-basic-offset: 4
   92  * tab-width: 4
   93  * indent-tabs-mode: nil
   94  * End:
   95  */

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