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 #ifndef __GNUC__ 35 #error gcc is required to use this file 36 #endif 37 38 #include <machine/segments.h> 39 #include <machine/tss.h> 40 41 /* 42 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 43 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 44 * The reason for doing it via a struct is so that an array of pointers 45 * to each CPU's data can be set up for things like "check curproc on all 46 * other processors" 47 */ 48 #define PCPU_MD_FIELDS \ 49 struct pcpu *pc_prvspace; /* Self-reference */ \ 50 struct i386tss pc_common_tss; \ 51 struct segment_descriptor pc_common_tssd; \ 52 struct segment_descriptor *pc_tss_gdt; \ 53 int pc_currentldt; \ 54 u_int32_t pc_int_pending; /* master int pending flag */ \ 55 u_int32_t pc_ipending; /* pending slow interrupts */ \ 56 u_int32_t pc_fpending; /* pending fast interrupts */ \ 57 u_int32_t pc_spending /* pending soft interrupts */ 58 59 /* 60 * Evaluates to the byte offset of the per-cpu variable name. 61 */ 62 #define __pcpu_offset(name) \ 63 __offsetof(struct pcpu, name) 64 65 /* 66 * Evaluates to the type of the per-cpu variable name. 67 */ 68 #define __pcpu_type(name) \ 69 __typeof(((struct pcpu *)0)->name) 70 71 /* 72 * Evaluates to the address of the per-cpu variable name. 73 */ 74 #define __PCPU_PTR(name) ({ \ 75 __pcpu_type(name) *__p; \ 76 \ 77 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 78 : "=r" (__p) \ 79 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 80 "i" (__pcpu_offset(name))); \ 81 \ 82 __p; \ 83 }) 84 85 /* 86 * Evaluates to the value of the per-cpu variable name. 87 */ 88 #define __PCPU_GET(name) ({ \ 89 __pcpu_type(name) __result; \ 90 \ 91 if (sizeof(__result) == 1) { \ 92 u_char __b; \ 93 __asm __volatile("movb %%fs:%1,%0" \ 94 : "=r" (__b) \ 95 : "m" (*(u_char *)(__pcpu_offset(name)))); \ 96 __result = *(__pcpu_type(name) *)&__b; \ 97 } else if (sizeof(__result) == 2) { \ 98 u_short __w; \ 99 __asm __volatile("movw %%fs:%1,%0" \ 100 : "=r" (__w) \ 101 : "m" (*(u_short *)(__pcpu_offset(name)))); \ 102 __result = *(__pcpu_type(name) *)&__w; \ 103 } else if (sizeof(__result) == 4) { \ 104 u_int __i; \ 105 __asm __volatile("movl %%fs:%1,%0" \ 106 : "=r" (__i) \ 107 : "m" (*(u_int *)(__pcpu_offset(name)))); \ 108 __result = *(__pcpu_type(name) *)&__i; \ 109 } else { \ 110 __result = *__PCPU_PTR(name); \ 111 } \ 112 \ 113 __result; \ 114 }) 115 116 /* 117 * Sets the value of the per-cpu variable name to value val. 118 */ 119 #define __PCPU_SET(name, val) ({ \ 120 __pcpu_type(name) __val = (val); \ 121 \ 122 if (sizeof(__val) == 1) { \ 123 u_char __b; \ 124 __b = *(u_char *)&__val; \ 125 __asm __volatile("movb %1,%%fs:%0" \ 126 : "=m" (*(u_char *)(__pcpu_offset(name))) \ 127 : "r" (__b)); \ 128 } else if (sizeof(__val) == 2) { \ 129 u_short __w; \ 130 __w = *(u_short *)&__val; \ 131 __asm __volatile("movw %1,%%fs:%0" \ 132 : "=m" (*(u_short *)(__pcpu_offset(name))) \ 133 : "r" (__w)); \ 134 } else if (sizeof(__val) == 4) { \ 135 u_int __i; \ 136 __i = *(u_int *)&__val; \ 137 __asm __volatile("movl %1,%%fs:%0" \ 138 : "=m" (*(u_int *)(__pcpu_offset(name))) \ 139 : "r" (__i)); \ 140 } else { \ 141 *__PCPU_PTR(name) = __val; \ 142 } \ 143 }) 144 145 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 146 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 147 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 148 149 #endif /* _KERNEL */ 150 151 #endif /* ! _MACHINE_PCPU_H_ */ 152