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

     /******************************************************************************
      * 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: releng/11.2/sys/xen/xen-os.h 315668 2017-03-21 08:38:12Z royger $
     */
    
    #ifndef _XEN_XEN_OS_H_
    #define _XEN_XEN_OS_H_
    
    #if !defined(__XEN_INTERFACE_VERSION__)  
    #define  __XEN_INTERFACE_VERSION__ 0x00030208
    #endif  
    
    #define GRANT_REF_INVALID   0xffffffff
    
    #ifdef LOCORE
    #define __ASSEMBLY__
    #endif
    
    #include <machine/xen/xen-os.h>
    
    #include <xen/interface/xen.h>
    
    /* Everything below this point is not included by assembler (.S) files. */
    #ifndef __ASSEMBLY__
    
    extern shared_info_t *HYPERVISOR_shared_info;
    extern start_info_t *HYPERVISOR_start_info;
    
    /* XXX: we need to get rid of this and use HYPERVISOR_start_info directly */
    extern char *console_page;
    
    extern int xen_disable_pv_disks;
    extern int xen_disable_pv_nics;
    
    extern bool xen_suspend_cancelled;
    
    enum xen_domain_type {
            XEN_NATIVE,             /* running on bare hardware    */
            XEN_PV_DOMAIN,          /* running in a PV domain      */
            XEN_HVM_DOMAIN,         /* running in a Xen hvm domain */
    };
    
    extern enum xen_domain_type xen_domain_type;
    
    static inline int
    xen_domain(void)
    {
            return (xen_domain_type != XEN_NATIVE);
    }
    
    static inline int
    xen_pv_domain(void)
    {
            return (xen_domain_type == XEN_PV_DOMAIN);
    }
    
    static inline int
    xen_hvm_domain(void)
    {
            return (xen_domain_type == XEN_HVM_DOMAIN);
    }
    
    static inline bool
    xen_initial_domain(void)
    {
            return (xen_domain() && HYPERVISOR_start_info != NULL &&
                (HYPERVISOR_start_info->flags & SIF_INITDOMAIN) != 0);
    }
    
    /*
     * Based on ofed/include/linux/bitops.h
     *
     * Those helpers are prefixed by xen_ because xen-os.h is widely included
     * and we don't want the other drivers using them.
     *
    */
   #define NBPL (NBBY * sizeof(long))
   
   static inline bool
   xen_test_bit(int bit, volatile long *addr)
   {
           unsigned long mask = 1UL << (bit % NBPL);
   
           return !!(atomic_load_acq_long(&addr[bit / NBPL]) & mask);
   }
   
   static inline void
   xen_set_bit(int bit, volatile long *addr)
   {
           atomic_set_long(&addr[bit / NBPL], 1UL << (bit % NBPL));
   }
   
   static inline void
   xen_clear_bit(int bit, volatile long *addr)
   {
           atomic_clear_long(&addr[bit / NBPL], 1UL << (bit % NBPL));
   }
   
   #undef NBPL
   
   /*
    * Functions to allocate/free unused memory in order
    * to map memory from other domains.
    */
   struct resource *xenmem_alloc(device_t dev, int *res_id, size_t size);
   int xenmem_free(device_t dev, int res_id, struct resource *res);
   
   /* Debug/emergency function, prints directly to hypervisor console */
   void xc_printf(const char *, ...) __printflike(1, 2);
   
   #ifndef xen_mb
   #define xen_mb() mb()
   #endif
   #ifndef xen_rmb
   #define xen_rmb() rmb()
   #endif
   #ifndef xen_wmb
   #define xen_wmb() wmb()
   #endif
   
   #endif /* !__ASSEMBLY__ */
   
   #endif /* _XEN_XEN_OS_H_ */

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