FreeBSD/Linux Kernel Cross Reference
sys/x86/include/xen/xen-os.h

     /*****************************************************************************
      * x86/xen/xen-os.h
      *
      * Random collection of macros and definition
      *
      * Copyright (c) 2003, 2004 Keir Fraser (on behalf of the Xen team)
      * All rights reserved.
      *
      * Permission is hereby granted, free of charge, to any person obtaining a copy
     * of this software and associated documentation files (the "Software"), to
     * deal in the Software without restriction, including without limitation the
     * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
     * sell copies of the Software, and to permit persons to whom the Software is
     * furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice shall be included in
     * all copies or substantial portions of the Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     * DEALINGS IN THE SOFTWARE.
     *
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_X86_XEN_XEN_OS_H_
    #define _MACHINE_X86_XEN_XEN_OS_H_
    
    #ifndef _XEN_XEN_OS_H_
    #error "do not #include machine/xen/xen-os.h, #include xen/xen-os.h instead"
    #endif
    
    /* Shared memory needs write-back as its cache attribute for coherency. */
    #define VM_MEMATTR_XEN VM_MEMATTR_WRITE_BACK
    
    /* Everything below this point is not included by assembler (.S) files. */
    #ifndef __ASSEMBLY__
    
    /* If non-zero, the hypervisor has been configured to use a direct vector */
    extern int xen_vector_callback_enabled;
    
    /* tunable for disabling PV disks */
    extern int xen_disable_pv_disks;
    
    /* tunable for disabling PV nics */
    extern int xen_disable_pv_nics;
    
    extern uint32_t xen_cpuid_base;
    
    static inline bool
    xen_has_percpu_evtchn(void)
    {
    
            return (!xen_hvm_domain() || xen_vector_callback_enabled);
    }
    
    static inline bool
    xen_pv_disks_disabled(void)
    {
    
            return (xen_hvm_domain() && xen_disable_pv_disks != 0);
    }
    
    static inline bool
    xen_pv_nics_disabled(void)
    {
    
            return (xen_hvm_domain() && xen_disable_pv_nics != 0);
    }
    
    bool xen_has_iommu_maps(void);
    
    #endif /* !__ASSEMBLY__ */
    
    #endif /* _MACHINE_X86_XEN_XEN_OS_H_ */

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