pcb.h revision 216634
14Srgrimes/*- 2122296Speter * Copyright (c) 2003 Peter Wemm. 34Srgrimes * Copyright (c) 1990 The Regents of the University of California. 44Srgrimes * All rights reserved. 54Srgrimes * 64Srgrimes * This code is derived from software contributed to Berkeley by 74Srgrimes * William Jolitz. 84Srgrimes * 94Srgrimes * Redistribution and use in source and binary forms, with or without 104Srgrimes * modification, are permitted provided that the following conditions 114Srgrimes * are met: 124Srgrimes * 1. Redistributions of source code must retain the above copyright 134Srgrimes * notice, this list of conditions and the following disclaimer. 144Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 154Srgrimes * notice, this list of conditions and the following disclaimer in the 164Srgrimes * documentation and/or other materials provided with the distribution. 174Srgrimes * 4. Neither the name of the University nor the names of its contributors 184Srgrimes * may be used to endorse or promote products derived from this software 194Srgrimes * without specific prior written permission. 204Srgrimes * 214Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 224Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 234Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 244Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 254Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 264Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 274Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 284Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 294Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 304Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 314Srgrimes * SUCH DAMAGE. 324Srgrimes * 33557Srgrimes * from: @(#)pcb.h 5.10 (Berkeley) 5/12/91 3450477Speter * $FreeBSD: head/sys/amd64/include/pcb.h 216634 2010-12-22 00:18:42Z jkim $ 354Srgrimes */ 364Srgrimes 37122296Speter#ifndef _AMD64_PCB_H_ 38122296Speter#define _AMD64_PCB_H_ 39557Srgrimes 404Srgrimes/* 41122278Speter * AMD64 process control block 424Srgrimes */ 43122278Speter#include <machine/fpu.h> 44168035Sjkim#include <machine/segments.h> 454Srgrimes 464Srgrimesstruct pcb { 47114349Speter register_t pcb_r15; 48114349Speter register_t pcb_r14; 49114349Speter register_t pcb_r13; 50114349Speter register_t pcb_r12; 51114349Speter register_t pcb_rbp; 52114349Speter register_t pcb_rsp; 53114349Speter register_t pcb_rbx; 54114349Speter register_t pcb_rip; 55114928Speter register_t pcb_fsbase; 56114928Speter register_t pcb_gsbase; 57210777Sjkim register_t pcb_kgsbase; 58210777Sjkim register_t pcb_cr0; 59210777Sjkim register_t pcb_cr2; 60210777Sjkim register_t pcb_cr3; 61210777Sjkim register_t pcb_cr4; 62210777Sjkim register_t pcb_dr0; 63210777Sjkim register_t pcb_dr1; 64210777Sjkim register_t pcb_dr2; 65210777Sjkim register_t pcb_dr3; 66210777Sjkim register_t pcb_dr6; 67210777Sjkim register_t pcb_dr7; 6848691Sjlemon 69216634Sjkim struct region_descriptor pcb_gdt; 70216634Sjkim struct region_descriptor pcb_idt; 71216634Sjkim struct region_descriptor pcb_ldt; 72216634Sjkim uint16_t pcb_tr; 73216634Sjkim 74216634Sjkim u_char pcb_flags; 75216634Sjkim#define PCB_FULL_IRET 0x01 /* full iret is required */ 76210780Sjkim#define PCB_DBREGS 0x02 /* process using debug registers */ 77210780Sjkim#define PCB_KERNFPU 0x04 /* kernel uses fpu */ 78210780Sjkim#define PCB_FPUINITDONE 0x08 /* fpu state is initialized */ 79210780Sjkim#define PCB_USERFPUINITDONE 0x10 /* fpu user state is initialized */ 80210780Sjkim#define PCB_GS32BIT 0x20 /* linux gs switch */ 81210780Sjkim#define PCB_32BIT 0x40 /* process has 32 bit context (segs etc) */ 82210780Sjkim 83189423Sjhb uint16_t pcb_initial_fpucw; 8448691Sjlemon 85216634Sjkim /* copyin/out fault recovery */ 86216634Sjkim caddr_t pcb_onfault; 87168035Sjkim 88168035Sjkim /* 32-bit segment descriptor */ 89210777Sjkim struct user_segment_descriptor pcb_gs32sd; 90216634Sjkim 91190620Skib /* local tss, with i/o bitmap; NULL for common */ 92190620Skib struct amd64tss *pcb_tssp; 934Srgrimes 94216634Sjkim struct savefpu *pcb_save; 95216634Sjkim struct savefpu pcb_user_save; 96189903Sjkim}; 97189903Sjkim 9855205Speter#ifdef _KERNEL 99131905Smarcelstruct trapframe; 100131905Smarcel 101216634Sjkim/* 102216634Sjkim * The pcb_flags is only modified by current thread, or by other threads 103216634Sjkim * when current thread is stopped. However, current thread may change it 104216634Sjkim * from the interrupt context in cpu_switch(), or in the trap handler. 105216634Sjkim * When we read-modify-write pcb_flags from C sources, compiler may generate 106216634Sjkim * code that is not atomic regarding the interrupt handler. If a trap or 107216634Sjkim * interrupt happens and any flag is modified from the handler, it can be 108216634Sjkim * clobbered with the cached value later. Therefore, we implement setting 109216634Sjkim * and clearing flags with single-instruction functions, which do not race 110216634Sjkim * with possible modification of the flags from the trap or interrupt context, 111216634Sjkim * because traps and interrupts are executed only on instruction boundary. 112216634Sjkim */ 113216634Sjkimstatic __inline void 114216634Sjkimset_pcb_flags(struct pcb *pcb, const u_char flags) 115216634Sjkim{ 116216634Sjkim 117216634Sjkim __asm __volatile("orb %b1,%0" 118216634Sjkim : "=m" (pcb->pcb_flags) : "iq" (flags), "m" (pcb->pcb_flags) 119216634Sjkim : "cc"); 120216634Sjkim} 121216634Sjkim 122216634Sjkimstatic __inline void 123216634Sjkimclear_pcb_flags(struct pcb *pcb, const u_char flags) 124216634Sjkim{ 125216634Sjkim 126216634Sjkim __asm __volatile("andb %b1,%0" 127216634Sjkim : "=m" (pcb->pcb_flags) : "iq" (~flags), "m" (pcb->pcb_flags) 128216634Sjkim : "cc"); 129216634Sjkim} 130216634Sjkim 131131905Smarcelvoid makectx(struct trapframe *, struct pcb *); 132210777Sjkimint savectx(struct pcb *); 1334Srgrimes#endif 134557Srgrimes 135122296Speter#endif /* _AMD64_PCB_H_ */ 136