FreeBSD/Linux Kernel Cross Reference
sys/i386/include/globals.h

     /*-
      * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
      * 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.
     *
     * 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_GLOBALS_H_
    #define _MACHINE_GLOBALS_H_
    
    #ifdef _KERNEL
    
    #define GLOBAL_LVALUE(name, type) \
            (*(type *)_global_ptr_##name())
            
    #define GLOBAL_RVALUE(name, type) \
            ((type)_global_##name())
    
    /* non-volatile version */
    #define GLOBAL_LVALUE_NV(name, type) \
            (*(type *)_global_ptr_##name##_nv())
            
    #define GLOBAL_RVALUE_NV(name, type) \
            ((type)_global_##name##_nv())
    
    #define GLOBAL_FUNC(name) \
            static __inline void *_global_ptr_##name(void) { \
                    void *val; \
                    __asm __volatile("movl $gd_" #name ",%0;" \
                            "addl %%fs:globaldata,%0" : "=r" (val)); \
                    return (val); \
            } \
            static __inline void *_global_ptr_##name##_nv(void) { \
                    void *val; \
                    __asm("movl $gd_" #name ",%0;" \
                            "addl %%fs:globaldata,%0" : "=r" (val)); \
                    return (val); \
            } \
            static __inline int _global_##name(void) { \
                    int val; \
                    __asm __volatile("movl %%fs:gd_" #name ",%0" : "=r" (val)); \
                    return (val); \
            } \
            static __inline int _global_##name##_nv(void) { \
                    int val; \
                    __asm("movl %%fs:gd_" #name ",%0" : "=r" (val)); \
                    return (val); \
            } \
            static __inline void _global_##name##_set(int val) { \
                    __asm __volatile("movl %0,%%fs:gd_" #name : : "r" (val)); \
            } \
            static __inline void _global_##name##_set_nv(int val) { \
                    __asm("movl %0,%%fs:gd_" #name : : "r" (val)); \
            }
    
    #if defined(SMP) || defined(KLD_MODULE) || defined(ACTUALLY_LKM_NOT_KERNEL)
    /*
     * The following set of macros works for UP kernel as well, but for maximum
     * performance we allow the global variables to be accessed directly. On the
     * other hand, kernel modules should always use these macros to maintain
     * portability between UP and SMP kernels.
     */
    #define curproc         GLOBAL_RVALUE_NV(curproc, struct proc *)
    #define curpcb          GLOBAL_RVALUE_NV(curpcb, struct pcb *)
    #define npxproc         GLOBAL_LVALUE(npxproc, struct proc *)
    #define common_tss      GLOBAL_LVALUE(common_tss, struct i386tss)
    #define switchtime      GLOBAL_LVALUE(switchtime, struct timeval)
    #define switchticks     GLOBAL_LVALUE(switchticks, int)
    
    #define common_tssd     GLOBAL_LVALUE(common_tssd, struct segment_descriptor)
    #define tss_gdt         GLOBAL_LVALUE(tss_gdt, struct segment_descriptor *)
    #define astpending      GLOBAL_LVALUE(astpending, u_int)
    
    #ifdef USER_LDT
    #define currentldt      GLOBAL_LVALUE(currentldt, int)
    #endif
    
    #ifdef SMP
   #define cpuid           GLOBAL_RVALUE(cpuid, u_int)
   #define other_cpus      GLOBAL_LVALUE(other_cpus, u_int)
   #define inside_intr     GLOBAL_LVALUE(inside_intr, int)
   #define prv_CMAP1       GLOBAL_LVALUE(prv_CMAP1, pt_entry_t *)
   #define prv_CMAP2       GLOBAL_LVALUE(prv_CMAP2, pt_entry_t *)
   #define prv_CMAP3       GLOBAL_LVALUE(prv_CMAP3, pt_entry_t *)
   #define prv_PMAP1       GLOBAL_LVALUE(prv_PMAP1, pd_entry_t *)
   #define prv_PMAP2       GLOBAL_LVALUE(prv_PMAP2, pd_entry_t *)
   #define prv_CADDR1      GLOBAL_RVALUE(prv_CADDR1, caddr_t)
   #define prv_CADDR2      GLOBAL_RVALUE(prv_CADDR2, caddr_t)
   #define prv_CADDR3      GLOBAL_RVALUE(prv_CADDR3, caddr_t)
   #define prv_PADDR1      GLOBAL_RVALUE(prv_PADDR1, pt_entry_t *)
   #define prv_PADDR2      GLOBAL_RVALUE(prv_PADDR2, pt_entry_t *)
   #endif
   #endif  /*UP kernel*/
   
   GLOBAL_FUNC(curproc)
   GLOBAL_FUNC(astpending)
   GLOBAL_FUNC(curpcb)
   GLOBAL_FUNC(npxproc)
   GLOBAL_FUNC(common_tss)
   GLOBAL_FUNC(switchtime)
   GLOBAL_FUNC(switchticks)
   
   GLOBAL_FUNC(common_tssd)
   GLOBAL_FUNC(tss_gdt)
   
   #ifdef USER_LDT
   GLOBAL_FUNC(currentldt)
   #endif
   
   #ifdef SMP
   GLOBAL_FUNC(cpuid)
   GLOBAL_FUNC(other_cpus)
   GLOBAL_FUNC(inside_intr)
   GLOBAL_FUNC(prv_CMAP1)
   GLOBAL_FUNC(prv_CMAP2)
   GLOBAL_FUNC(prv_CMAP3)
   GLOBAL_FUNC(prv_PMAP1)
   GLOBAL_FUNC(prv_PMAP2)
   GLOBAL_FUNC(prv_CADDR1)
   GLOBAL_FUNC(prv_CADDR2)
   GLOBAL_FUNC(prv_CADDR3)
   GLOBAL_FUNC(prv_PADDR1)
   GLOBAL_FUNC(prv_PADDR2)
   #endif
   
   #define SET_CURPROC(x)  (_global_curproc_set_nv((int)x))
   
   #endif  /* _KERNEL */
   
   #endif  /* !_MACHINE_GLOBALS_H_ */

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