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      1 /*	$NetBSD: cpu.h,v 1.185 2023/09/04 20:58:52 mrg Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)cpu.h	5.4 (Berkeley) 5/9/91
     35  */
     36 
     37 #ifndef _I386_CPU_H_
     38 #define _I386_CPU_H_
     39 
     40 #include <x86/cpu.h>
     41 
     42 #ifdef _KERNEL
     43 
     44 #if defined(__GNUC__) && !defined(_MODULE)
     45 static struct cpu_info *x86_curcpu(void);
     46 static lwp_t *x86_curlwp(void);
     47 
     48 /*
     49  * XXXGCC12 has:
     50  * ./machine/cpu.h:57:9: error: array subscript 0 is outside array bounds of 'struct cpu_info * const[0]' [-Werror=array-bounds]
     51  *    56 |         __asm("movq %%gs:%1, %0" :
     52  */
     53 #pragma GCC push_options
     54 #pragma GCC diagnostic ignored "-Warray-bounds"
     55 
     56 __inline __always_inline static struct cpu_info * __unused
     57 x86_curcpu(void)
     58 {
     59 	struct cpu_info *ci;
     60 
     61 	__asm("movl %%fs:%1, %0" :
     62 	    "=r" (ci) :
     63 	    "m"
     64 	    (*(struct cpu_info * const *)offsetof(struct cpu_info, ci_self)));
     65 	return ci;
     66 }
     67 
     68 __inline static lwp_t * __attribute__ ((const))
     69 x86_curlwp(void)
     70 {
     71 	lwp_t *l;
     72 
     73 	__asm("movl %%fs:%1, %0" :
     74 	    "=r" (l) :
     75 	    "m"
     76 	    (*(struct cpu_info * const *)offsetof(struct cpu_info, ci_curlwp)));
     77 	return l;
     78 }
     79 
     80 #pragma GCC pop_options
     81 
     82 #endif	/* __GNUC__ && !_MODULE */
     83 
     84 #ifdef XENPV
     85 #define	CLKF_USERMODE(frame)	(curcpu()->ci_xen_clockf_usermode)
     86 #define CLKF_PC(frame)		(curcpu()->ci_xen_clockf_pc)
     87 #else /* XENPV */
     88 #define	CLKF_USERMODE(frame)	USERMODE((frame)->cf_if.if_cs)
     89 #define	CLKF_PC(frame)		((frame)->cf_if.if_eip)
     90 #endif /* XENPV */
     91 #define	CLKF_INTR(frame)	(curcpu()->ci_idepth > 0)
     92 #define	LWP_PC(l)		((l)->l_md.md_regs->tf_eip)
     93 
     94 #ifdef PAE
     95 void cpu_alloc_l3_page(struct cpu_info *);
     96 #endif /* PAE */
     97 
     98 #endif	/* _KERNEL */
     99 
    100 #endif /* !_I386_CPU_H_ */
    101