1 /*- 2 * Copyright (c) Peter Wemm <peter@netplex.com.au> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _MACHINE_PCPU_H_ 30 #define _MACHINE_PCPU_H_ 31 32 #ifdef _KERNEL 33 34 #include <machine/segments.h> 35 #include <machine/tss.h> 36 37 /* 38 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 39 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 40 * The reason for doing it via a struct is so that an array of pointers 41 * to each CPU's data can be set up for things like "check curproc on all 42 * other processors" 43 */ 44 #define PCPU_MD_FIELDS \ 45 struct pcpu *pc_prvspace; /* Self-reference */ \ 46 struct pmap *pc_curpmap; \ 47 struct i386tss pc_common_tss; \ 48 struct segment_descriptor pc_common_tssd; \ 49 struct segment_descriptor *pc_tss_gdt; \ 50 int pc_currentldt; \ 51 u_int32_t pc_int_pending; /* master int pending flag */ \ 52 u_int32_t pc_ipending; /* pending slow interrupts */ \ 53 u_int32_t pc_fpending; /* pending fast interrupts */ \ 54 u_int32_t pc_spending /* pending soft interrupts */ 55 56 #if defined(lint) 57 58 extern struct pcpu *pcpup; 59 60 #define PCPU_GET(member) (pcpup->pc_ ## member) 61 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 62 #define PCPU_SET(member,value) (pcpup->pc_ ## member = (value)) 63 64 #elif defined(__GNUC__) 65 66 /* 67 * Evaluates to the byte offset of the per-cpu variable name. 68 */ 69 #define __pcpu_offset(name) \ 70 __offsetof(struct pcpu, name) 71 72 /* 73 * Evaluates to the type of the per-cpu variable name. 74 */ 75 #define __pcpu_type(name) \ 76 __typeof(((struct pcpu *)0)->name) 77 78 /* 79 * Evaluates to the address of the per-cpu variable name. 80 */ 81 #define __PCPU_PTR(name) ({ \ 82 __pcpu_type(name) *__p; \ 83 \ 84 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 85 : "=r" (__p) \ 86 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 87 "i" (__pcpu_offset(name))); \ 88 \ 89 __p; \ 90 }) 91 92 /* 93 * Evaluates to the value of the per-cpu variable name. 94 */ 95 #define __PCPU_GET(name) ({ \ 96 __pcpu_type(name) __result; \ 97 \ 98 if (sizeof(__result) == 1) { \ 99 u_char __b; \ 100 __asm __volatile("movb %%fs:%1,%0" \ 101 : "=r" (__b) \ 102 : "m" (*(u_char *)(__pcpu_offset(name)))); \ 103 __result = *(__pcpu_type(name) *)(void *)&__b; \ 104 } else if (sizeof(__result) == 2) { \ 105 u_short __w; \ 106 __asm __volatile("movw %%fs:%1,%0" \ 107 : "=r" (__w) \ 108 : "m" (*(u_short *)(__pcpu_offset(name)))); \ 109 __result = *(__pcpu_type(name) *)(void *)&__w; \ 110 } else if (sizeof(__result) == 4) { \ 111 u_int __i; \ 112 __asm __volatile("movl %%fs:%1,%0" \ 113 : "=r" (__i) \ 114 : "m" (*(u_int *)(__pcpu_offset(name)))); \ 115 __result = *(__pcpu_type(name) *)(void *)&__i; \ 116 } else { \ 117 __result = *__PCPU_PTR(name); \ 118 } \ 119 \ 120 __result; \ 121 }) 122 123 /* 124 * Sets the value of the per-cpu variable name to value val. 125 */ 126 #define __PCPU_SET(name, val) ({ \ 127 __pcpu_type(name) __val = (val); \ 128 \ 129 if (sizeof(__val) == 1) { \ 130 u_char __b; \ 131 __b = *(u_char *)&__val; \ 132 __asm __volatile("movb %1,%%fs:%0" \ 133 : "=m" (*(u_char *)(__pcpu_offset(name))) \ 134 : "r" (__b)); \ 135 } else if (sizeof(__val) == 2) { \ 136 u_short __w; \ 137 __w = *(u_short *)&__val; \ 138 __asm __volatile("movw %1,%%fs:%0" \ 139 : "=m" (*(u_short *)(__pcpu_offset(name))) \ 140 : "r" (__w)); \ 141 } else if (sizeof(__val) == 4) { \ 142 u_int __i; \ 143 __i = *(u_int *)&__val; \ 144 __asm __volatile("movl %1,%%fs:%0" \ 145 : "=m" (*(u_int *)(__pcpu_offset(name))) \ 146 : "r" (__i)); \ 147 } else { \ 148 *__PCPU_PTR(name) = __val; \ 149 } \ 150 }) 151 152 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 153 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 154 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 155 156 #else 157 #error gcc or lint is required to use this file 158 #endif 159 160 #endif /* _KERNEL */ 161 162 #endif /* ! _MACHINE_PCPU_H_ */ 163