1 /*- 2 * Copyright (c) 2003 Peter Wemm. 3 * Copyright (c) 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)pcb.h 5.10 (Berkeley) 5/12/91 34 * $FreeBSD$ 35 */ 36 37 #ifndef _AMD64_PCB_H_ 38 #define _AMD64_PCB_H_ 39 40 /* 41 * AMD64 process control block 42 */ 43 #include <machine/fpu.h> 44 #include <machine/segments.h> 45 46 #ifdef __amd64__ 47 /* 48 * NB: The fields marked with (*) are used by kernel debuggers. Their 49 * ABI should be preserved. 50 */ 51 struct pcb { 52 register_t pcb_r15; /* (*) */ 53 register_t pcb_r14; /* (*) */ 54 register_t pcb_r13; /* (*) */ 55 register_t pcb_r12; /* (*) */ 56 register_t pcb_rbp; /* (*) */ 57 register_t pcb_rsp; /* (*) */ 58 register_t pcb_rbx; /* (*) */ 59 register_t pcb_rip; /* (*) */ 60 register_t pcb_fsbase; 61 register_t pcb_gsbase; 62 register_t pcb_kgsbase; 63 register_t pcb_cr0; 64 register_t pcb_cr2; 65 register_t pcb_cr3; 66 register_t pcb_cr4; 67 register_t pcb_dr0; 68 register_t pcb_dr1; 69 register_t pcb_dr2; 70 register_t pcb_dr3; 71 register_t pcb_dr6; 72 register_t pcb_dr7; 73 74 struct region_descriptor pcb_gdt; 75 struct region_descriptor pcb_idt; 76 struct region_descriptor pcb_ldt; 77 uint16_t pcb_tr; 78 79 u_int pcb_flags; 80 #define PCB_FULL_IRET 0x01 /* full iret is required */ 81 #define PCB_DBREGS 0x02 /* process using debug registers */ 82 #define PCB_KERNFPU 0x04 /* kernel uses fpu */ 83 #define PCB_FPUINITDONE 0x08 /* fpu state is initialized */ 84 #define PCB_USERFPUINITDONE 0x10 /* fpu user state is initialized */ 85 #define PCB_32BIT 0x40 /* process has 32 bit context (segs etc) */ 86 87 uint16_t pcb_initial_fpucw; 88 89 /* copyin/out fault recovery */ 90 caddr_t pcb_onfault; 91 92 uint64_t pcb_pad0; 93 94 /* local tss, with i/o bitmap; NULL for common */ 95 struct amd64tss *pcb_tssp; 96 97 /* model specific registers */ 98 register_t pcb_efer; 99 register_t pcb_star; 100 register_t pcb_lstar; 101 register_t pcb_cstar; 102 register_t pcb_sfmask; 103 104 struct savefpu *pcb_save; 105 106 uint64_t pcb_pad[5]; 107 }; 108 109 /* Per-CPU state saved during suspend and resume. */ 110 struct susppcb { 111 struct pcb sp_pcb; 112 113 /* fpu context for suspend/resume */ 114 void *sp_fpususpend; 115 }; 116 #endif 117 118 #ifdef _KERNEL 119 struct trapframe; 120 121 /* 122 * The pcb_flags is only modified by current thread, or by other threads 123 * when current thread is stopped. However, current thread may change it 124 * from the interrupt context in cpu_switch(), or in the trap handler. 125 * When we read-modify-write pcb_flags from C sources, compiler may generate 126 * code that is not atomic regarding the interrupt handler. If a trap or 127 * interrupt happens and any flag is modified from the handler, it can be 128 * clobbered with the cached value later. Therefore, we implement setting 129 * and clearing flags with single-instruction functions, which do not race 130 * with possible modification of the flags from the trap or interrupt context, 131 * because traps and interrupts are executed only on instruction boundary. 132 */ 133 static __inline void 134 set_pcb_flags(struct pcb *pcb, const u_int flags) 135 { 136 137 __asm __volatile("orl %1,%0" 138 : "=m" (pcb->pcb_flags) : "ir" (flags), "m" (pcb->pcb_flags) 139 : "cc"); 140 } 141 142 static __inline void 143 clear_pcb_flags(struct pcb *pcb, const u_int flags) 144 { 145 146 __asm __volatile("andl %1,%0" 147 : "=m" (pcb->pcb_flags) : "ir" (~flags), "m" (pcb->pcb_flags) 148 : "cc"); 149 } 150 151 void makectx(struct trapframe *, struct pcb *); 152 int savectx(struct pcb *) __returns_twice; 153 void resumectx(struct pcb *); 154 155 #endif 156 157 #endif /* _AMD64_PCB_H_ */ 158