pcb.h revision 271999
12116Sjkh/*- 22116Sjkh * Copyright (c) 2003 Peter Wemm. 32116Sjkh * Copyright (c) 1990 The Regents of the University of California. 42116Sjkh * All rights reserved. 52116Sjkh * 62116Sjkh * This code is derived from software contributed to Berkeley by 72116Sjkh * William Jolitz. 88870Srgrimes * 92116Sjkh * Redistribution and use in source and binary forms, with or without 102116Sjkh * modification, are permitted provided that the following conditions 112116Sjkh * are met: 122116Sjkh * 1. Redistributions of source code must retain the above copyright 13176385Sbde * notice, this list of conditions and the following disclaimer. 14176385Sbde * 2. Redistributions in binary form must reproduce the above copyright 152116Sjkh * notice, this list of conditions and the following disclaimer in the 162116Sjkh * documentation and/or other materials provided with the distribution. 172116Sjkh * 4. Neither the name of the University nor the names of its contributors 182116Sjkh * may be used to endorse or promote products derived from this software 192116Sjkh * without specific prior written permission. 202116Sjkh * 212116Sjkh * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 222116Sjkh * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 232116Sjkh * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 248870Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 258870Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 262116Sjkh * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 272116Sjkh * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 282116Sjkh * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 292116Sjkh * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 302116Sjkh * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 312116Sjkh * SUCH DAMAGE. 322116Sjkh * 332116Sjkh * from: @(#)pcb.h 5.10 (Berkeley) 5/12/91 342116Sjkh * $FreeBSD: stable/10/sys/amd64/include/pcb.h 271999 2014-09-22 20:34:36Z jhb $ 352116Sjkh */ 362116Sjkh 372116Sjkh#ifndef _AMD64_PCB_H_ 382116Sjkh#define _AMD64_PCB_H_ 392116Sjkh 402116Sjkh/* 412116Sjkh * AMD64 process control block 422116Sjkh */ 438870Srgrimes#include <machine/fpu.h> 442116Sjkh#include <machine/segments.h> 452116Sjkh 46176360Sdas#ifdef __amd64__ 47176360Sdasstruct pcb { 482116Sjkh register_t pcb_r15; 49176385Sbde register_t pcb_r14; 502116Sjkh register_t pcb_r13; 51176385Sbde register_t pcb_r12; 522116Sjkh register_t pcb_rbp; 5397413Salfred register_t pcb_rsp; 54117912Speter register_t pcb_rbx; 552116Sjkh register_t pcb_rip; 562116Sjkh register_t pcb_fsbase; 572116Sjkh register_t pcb_gsbase; 582116Sjkh register_t pcb_kgsbase; 592116Sjkh register_t pcb_cr0; 602116Sjkh register_t pcb_cr2; 612116Sjkh register_t pcb_cr3; 622116Sjkh register_t pcb_cr4; 632116Sjkh register_t pcb_dr0; 64151969Sbde register_t pcb_dr1; 65151969Sbde register_t pcb_dr2; 66151969Sbde register_t pcb_dr3; 67151969Sbde register_t pcb_dr6; 68151969Sbde register_t pcb_dr7; 692116Sjkh 702116Sjkh struct region_descriptor pcb_gdt; 712116Sjkh struct region_descriptor pcb_idt; 722116Sjkh struct region_descriptor pcb_ldt; 732116Sjkh uint16_t pcb_tr; 742116Sjkh 752116Sjkh u_int pcb_flags; 762116Sjkh#define PCB_FULL_IRET 0x01 /* full iret is required */ 772116Sjkh#define PCB_DBREGS 0x02 /* process using debug registers */ 782116Sjkh#define PCB_KERNFPU 0x04 /* kernel uses fpu */ 792116Sjkh#define PCB_FPUINITDONE 0x08 /* fpu state is initialized */ 80176360Sdas#define PCB_USERFPUINITDONE 0x10 /* fpu user state is initialized */ 81176360Sdas#define PCB_32BIT 0x40 /* process has 32 bit context (segs etc) */ 82176360Sdas 83176360Sdas uint16_t pcb_initial_fpucw; 84 85 /* copyin/out fault recovery */ 86 caddr_t pcb_onfault; 87 88 /* 32-bit segment descriptor */ 89 struct user_segment_descriptor pcb_gs32sd; 90 91 /* local tss, with i/o bitmap; NULL for common */ 92 struct amd64tss *pcb_tssp; 93 94 /* model specific registers */ 95 register_t pcb_efer; 96 register_t pcb_star; 97 register_t pcb_lstar; 98 register_t pcb_cstar; 99 register_t pcb_sfmask; 100 101 struct savefpu *pcb_save; 102 103 uint64_t pcb_pad[5]; 104}; 105 106/* Per-CPU state saved during suspend and resume. */ 107struct susppcb { 108 struct pcb sp_pcb; 109 110 /* fpu context for suspend/resume */ 111 void *sp_fpususpend; 112}; 113#endif 114 115#ifdef _KERNEL 116struct trapframe; 117 118/* 119 * The pcb_flags is only modified by current thread, or by other threads 120 * when current thread is stopped. However, current thread may change it 121 * from the interrupt context in cpu_switch(), or in the trap handler. 122 * When we read-modify-write pcb_flags from C sources, compiler may generate 123 * code that is not atomic regarding the interrupt handler. If a trap or 124 * interrupt happens and any flag is modified from the handler, it can be 125 * clobbered with the cached value later. Therefore, we implement setting 126 * and clearing flags with single-instruction functions, which do not race 127 * with possible modification of the flags from the trap or interrupt context, 128 * because traps and interrupts are executed only on instruction boundary. 129 */ 130static __inline void 131set_pcb_flags(struct pcb *pcb, const u_int flags) 132{ 133 134 __asm __volatile("orl %1,%0" 135 : "=m" (pcb->pcb_flags) : "ir" (flags), "m" (pcb->pcb_flags) 136 : "cc"); 137} 138 139static __inline void 140clear_pcb_flags(struct pcb *pcb, const u_int flags) 141{ 142 143 __asm __volatile("andl %1,%0" 144 : "=m" (pcb->pcb_flags) : "ir" (~flags), "m" (pcb->pcb_flags) 145 : "cc"); 146} 147 148void makectx(struct trapframe *, struct pcb *); 149int savectx(struct pcb *) __returns_twice; 150void resumectx(struct pcb *); 151 152#endif 153 154#endif /* _AMD64_PCB_H_ */ 155