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
set_pcb_flags(struct pcb * pcb,const u_int flags)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
clear_pcb_flags(struct pcb * pcb,const u_int flags)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