pcb.h revision 250423
1178476Sjb/*- 2178476Sjb * Copyright (c) 2003 Peter Wemm. 3178476Sjb * Copyright (c) 1990 The Regents of the University of California. 4178476Sjb * All rights reserved. 5178476Sjb * 6178476Sjb * This code is derived from software contributed to Berkeley by 7178476Sjb * William Jolitz. 8178476Sjb * 9178476Sjb * Redistribution and use in source and binary forms, with or without 10178476Sjb * modification, are permitted provided that the following conditions 11178476Sjb * are met: 12178476Sjb * 1. Redistributions of source code must retain the above copyright 13178476Sjb * notice, this list of conditions and the following disclaimer. 14178476Sjb * 2. Redistributions in binary form must reproduce the above copyright 15178476Sjb * notice, this list of conditions and the following disclaimer in the 16178476Sjb * documentation and/or other materials provided with the distribution. 17178476Sjb * 4. Neither the name of the University nor the names of its contributors 18178476Sjb * may be used to endorse or promote products derived from this software 19178476Sjb * without specific prior written permission. 20178476Sjb * 21178476Sjb * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22178476Sjb * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23178476Sjb * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24178476Sjb * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25178476Sjb * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26178476Sjb * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27178476Sjb * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28178476Sjb * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29178476Sjb * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30178476Sjb * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31178476Sjb * SUCH DAMAGE. 32178476Sjb * 33178476Sjb * from: @(#)pcb.h 5.10 (Berkeley) 5/12/91 34178476Sjb * $FreeBSD: head/sys/amd64/include/pcb.h 250423 2013-05-09 21:42:43Z dchagin $ 35178476Sjb */ 36178476Sjb 37178476Sjb#ifndef _AMD64_PCB_H_ 38178476Sjb#define _AMD64_PCB_H_ 39178476Sjb 40178476Sjb/* 41178476Sjb * AMD64 process control block 42178476Sjb */ 43178476Sjb#include <machine/fpu.h> 44178476Sjb#include <machine/segments.h> 45178476Sjb 46178476Sjbstruct pcb { 47178476Sjb register_t pcb_r15; 48178476Sjb register_t pcb_r14; 49178476Sjb register_t pcb_r13; 50178476Sjb register_t pcb_r12; 51178476Sjb register_t pcb_rbp; 52178476Sjb register_t pcb_rsp; 53178476Sjb register_t pcb_rbx; 54178476Sjb register_t pcb_rip; 55178476Sjb register_t pcb_fsbase; 56178476Sjb register_t pcb_gsbase; 57178476Sjb register_t pcb_kgsbase; 58178476Sjb register_t pcb_cr0; 59178476Sjb register_t pcb_cr2; 60178476Sjb register_t pcb_cr3; 61178476Sjb register_t pcb_cr4; 62178476Sjb register_t pcb_dr0; 63178476Sjb register_t pcb_dr1; 64178476Sjb register_t pcb_dr2; 65178476Sjb register_t pcb_dr3; 66178476Sjb register_t pcb_dr6; 67178476Sjb register_t pcb_dr7; 68178476Sjb 69178476Sjb struct region_descriptor pcb_gdt; 70178476Sjb struct region_descriptor pcb_idt; 71178476Sjb struct region_descriptor pcb_ldt; 72178476Sjb uint16_t pcb_tr; 73178476Sjb 74178476Sjb u_int pcb_flags; 75178476Sjb#define PCB_FULL_IRET 0x01 /* full iret is required */ 76178476Sjb#define PCB_DBREGS 0x02 /* process using debug registers */ 77178476Sjb#define PCB_KERNFPU 0x04 /* kernel uses fpu */ 78178476Sjb#define PCB_FPUINITDONE 0x08 /* fpu state is initialized */ 79178476Sjb#define PCB_USERFPUINITDONE 0x10 /* fpu user state is initialized */ 80178476Sjb#define PCB_32BIT 0x40 /* process has 32 bit context (segs etc) */ 81178476Sjb 82211545Srpaulo uint16_t pcb_initial_fpucw; 83 84 /* copyin/out fault recovery */ 85 caddr_t pcb_onfault; 86 87 /* 32-bit segment descriptor */ 88 struct user_segment_descriptor pcb_gs32sd; 89 90 /* local tss, with i/o bitmap; NULL for common */ 91 struct amd64tss *pcb_tssp; 92 93 /* model specific registers */ 94 register_t pcb_efer; 95 register_t pcb_star; 96 register_t pcb_lstar; 97 register_t pcb_cstar; 98 register_t pcb_sfmask; 99 register_t pcb_xsmask; 100 101 /* fpu context for suspend/resume */ 102 void *pcb_fpususpend; 103 104 struct savefpu *pcb_save; 105 106 uint64_t pcb_pad[3]; 107}; 108 109#ifdef _KERNEL 110struct trapframe; 111 112/* 113 * The pcb_flags is only modified by current thread, or by other threads 114 * when current thread is stopped. However, current thread may change it 115 * from the interrupt context in cpu_switch(), or in the trap handler. 116 * When we read-modify-write pcb_flags from C sources, compiler may generate 117 * code that is not atomic regarding the interrupt handler. If a trap or 118 * interrupt happens and any flag is modified from the handler, it can be 119 * clobbered with the cached value later. Therefore, we implement setting 120 * and clearing flags with single-instruction functions, which do not race 121 * with possible modification of the flags from the trap or interrupt context, 122 * because traps and interrupts are executed only on instruction boundary. 123 */ 124static __inline void 125set_pcb_flags(struct pcb *pcb, const u_int flags) 126{ 127 128 __asm __volatile("orl %1,%0" 129 : "=m" (pcb->pcb_flags) : "ir" (flags), "m" (pcb->pcb_flags) 130 : "cc"); 131} 132 133static __inline void 134clear_pcb_flags(struct pcb *pcb, const u_int flags) 135{ 136 137 __asm __volatile("andl %1,%0" 138 : "=m" (pcb->pcb_flags) : "ir" (~flags), "m" (pcb->pcb_flags) 139 : "cc"); 140} 141 142void makectx(struct trapframe *, struct pcb *); 143int savectx(struct pcb *) __returns_twice; 144void resumectx(struct pcb *); 145 146#endif 147 148#endif /* _AMD64_PCB_H_ */ 149