2 * Copyright (c) 2003 Peter Wemm.
3 * Copyright (c) 1990 The Regents of the University of California.
6 * This code is derived from software contributed to Berkeley by
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10 * modification, are permitted provided that the following conditions
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.
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)
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33 * from: @(#)pcb.h 5.10 (Berkeley) 5/12/91
41 * AMD64 process control block
43 #include <machine/fpu.h>
44 #include <machine/segments.h>
48 * NB: The fields marked with (*) are used by kernel debuggers. Their
49 * ABI should be preserved.
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;
74 struct region_descriptor pcb_gdt;
75 struct region_descriptor pcb_idt;
76 struct region_descriptor pcb_ldt;
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) */
87 uint16_t pcb_initial_fpucw;
89 /* copyin/out fault recovery */
94 /* local tss, with i/o bitmap; NULL for common */
95 struct amd64tss *pcb_tssp;
97 /* model specific registers */
100 register_t pcb_lstar;
101 register_t pcb_cstar;
102 register_t pcb_sfmask;
104 struct savefpu *pcb_save;
109 /* Per-CPU state saved during suspend and resume. */
113 /* fpu context for suspend/resume */
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.
134 set_pcb_flags(struct pcb *pcb, const u_int flags)
137 __asm __volatile("orl %1,%0"
138 : "=m" (pcb->pcb_flags) : "ir" (flags), "m" (pcb->pcb_flags)
143 clear_pcb_flags(struct pcb *pcb, const u_int flags)
146 __asm __volatile("andl %1,%0"
147 : "=m" (pcb->pcb_flags) : "ir" (~flags), "m" (pcb->pcb_flags)
151 void makectx(struct trapframe *, struct pcb *);
152 int savectx(struct pcb *) __returns_twice;
153 void resumectx(struct pcb *);
157 #endif /* _AMD64_PCB_H_ */