FreeBSD/Linux Kernel Cross Reference
sys/x86/include/x86_var.h

     /*-
      * Copyright (c) 1995 Bruce D. Evans.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the author nor the names of contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/12.0/sys/x86/include/x86_var.h 335632 2018-06-25 11:01:12Z kib $
     */
    
    #ifndef _X86_X86_VAR_H_
    #define _X86_X86_VAR_H_
    
    /*
     * Miscellaneous machine-dependent declarations.
     */
    
    extern  long    Maxmem;
    extern  u_int   basemem;
    extern  int     busdma_swi_pending;
    extern  u_int   cpu_exthigh;
    extern  u_int   cpu_feature;
    extern  u_int   cpu_feature2;
    extern  u_int   amd_feature;
    extern  u_int   amd_feature2;
    extern  u_int   amd_rascap;
    extern  u_int   amd_pminfo;
    extern  u_int   amd_extended_feature_extensions;
    extern  u_int   via_feature_rng;
    extern  u_int   via_feature_xcrypt;
    extern  u_int   cpu_clflush_line_size;
    extern  u_int   cpu_stdext_feature;
    extern  u_int   cpu_stdext_feature2;
    extern  u_int   cpu_stdext_feature3;
    extern  uint64_t cpu_ia32_arch_caps;
    extern  u_int   cpu_fxsr;
    extern  u_int   cpu_high;
    extern  u_int   cpu_id;
    extern  u_int   cpu_max_ext_state_size;
    extern  u_int   cpu_mxcsr_mask;
    extern  u_int   cpu_procinfo;
    extern  u_int   cpu_procinfo2;
    extern  char    cpu_vendor[];
    extern  u_int   cpu_vendor_id;
    extern  u_int   cpu_mon_mwait_flags;
    extern  u_int   cpu_mon_min_size;
    extern  u_int   cpu_mon_max_size;
    extern  u_int   cpu_maxphyaddr;
    extern  char    ctx_switch_xsave[];
    extern  u_int   hv_high;
    extern  char    hv_vendor[];
    extern  char    kstack[];
    extern  char    sigcode[];
    extern  int     szsigcode;
    extern  int     vm_page_dump_size;
    extern  int     workaround_erratum383;
    extern  int     _udatasel;
    extern  int     _ucodesel;
    extern  int     _ucode32sel;
    extern  int     _ufssel;
    extern  int     _ugssel;
    extern  int     use_xsave;
    extern  uint64_t xsave_mask;
    extern  u_int   max_apic_id;
    extern  int     pti;
    extern  int     hw_ibrs_active;
    extern  int     hw_ssb_active;
    
    struct  pcb;
    struct  thread;
    struct  reg;
    struct  fpreg;
    struct  dbreg;
    struct  dumperinfo;
    struct  trapframe;
    
    /*
     * The interface type of the interrupt handler entry point cannot be
    * expressed in C.  Use simplest non-variadic function type as an
    * approximation.
    */
   typedef void alias_for_inthand_t(void);
   
   /*
    * Returns the maximum physical address that can be used with the
    * current system.
    */
   static __inline vm_paddr_t
   cpu_getmaxphyaddr(void)
   {
   #if defined(__i386__) && !defined(PAE)
           return (0xffffffff);
   #else
           return ((1ULL << cpu_maxphyaddr) - 1);
   #endif
   }
   
   bool    acpi_get_fadt_bootflags(uint16_t *flagsp);
   void    *alloc_fpusave(int flags);
   void    busdma_swi(void);
   bool    cpu_mwait_usable(void);
   void    cpu_probe_amdc1e(void);
   void    cpu_setregs(void);
   bool    disable_wp(void);
   void    restore_wp(bool old_wp);
   void    dump_add_page(vm_paddr_t);
   void    dump_drop_page(vm_paddr_t);
   void    finishidentcpu(void);
   void    identify_cpu1(void);
   void    identify_cpu2(void);
   void    identify_hypervisor(void);
   void    initializecpu(void);
   void    initializecpucache(void);
   bool    fix_cpuid(void);
   void    fillw(int /*u_short*/ pat, void *base, size_t cnt);
   int     is_physical_memory(vm_paddr_t addr);
   int     isa_nmi(int cd);
   void    handle_ibrs_entry(void);
   void    handle_ibrs_exit(void);
   void    hw_ibrs_recalculate(void);
   void    hw_ssb_recalculate(bool all_cpus);
   void    nmi_call_kdb(u_int cpu, u_int type, struct trapframe *frame);
   void    nmi_call_kdb_smp(u_int type, struct trapframe *frame);
   void    nmi_handle_intr(u_int type, struct trapframe *frame);
   void    pagecopy(void *from, void *to);
   void    printcpuinfo(void);
   int     pti_get_default(void);
   int     user_dbreg_trap(register_t dr6);
   int     minidumpsys(struct dumperinfo *);
   struct pcb *get_pcb_td(struct thread *td);
   
   #endif

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