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
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13 * notice, this list of conditions and the following disclaimer.
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17 * 4. Neither the name of the University nor the names of its contributors
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19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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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>
55 register_t pcb_fsbase;
56 register_t pcb_gsbase;
57 register_t pcb_kgsbase;
69 struct region_descriptor pcb_gdt;
70 struct region_descriptor pcb_idt;
71 struct region_descriptor pcb_ldt;
75 #define PCB_FULL_IRET 0x01 /* full iret is required */
76 #define PCB_DBREGS 0x02 /* process using debug registers */
77 #define PCB_KERNFPU 0x04 /* kernel uses fpu */
78 #define PCB_FPUINITDONE 0x08 /* fpu state is initialized */
79 #define PCB_USERFPUINITDONE 0x10 /* fpu user state is initialized */
80 #define PCB_GS32BIT 0x20 /* linux gs switch */
81 #define PCB_32BIT 0x40 /* process has 32 bit context (segs etc) */
83 uint16_t pcb_initial_fpucw;
85 /* copyin/out fault recovery */
88 /* 32-bit segment descriptor */
89 struct user_segment_descriptor pcb_gs32sd;
91 /* local tss, with i/o bitmap; NULL for common */
92 struct amd64tss *pcb_tssp;
94 struct savefpu *pcb_save;
103 * The pcb_flags is only modified by current thread, or by other threads
104 * when current thread is stopped. However, current thread may change it
105 * from the interrupt context in cpu_switch(), or in the trap handler.
106 * When we read-modify-write pcb_flags from C sources, compiler may generate
107 * code that is not atomic regarding the interrupt handler. If a trap or
108 * interrupt happens and any flag is modified from the handler, it can be
109 * clobbered with the cached value later. Therefore, we implement setting
110 * and clearing flags with single-instruction functions, which do not race
111 * with possible modification of the flags from the trap or interrupt context,
112 * because traps and interrupts are executed only on instruction boundary.
115 set_pcb_flags(struct pcb *pcb, const u_int flags)
118 __asm __volatile("orl %1,%0"
119 : "=m" (pcb->pcb_flags) : "ir" (flags), "m" (pcb->pcb_flags)
124 clear_pcb_flags(struct pcb *pcb, const u_int flags)
127 __asm __volatile("andl %1,%0"
128 : "=m" (pcb->pcb_flags) : "ir" (~flags), "m" (pcb->pcb_flags)
132 void makectx(struct trapframe *, struct pcb *);
133 int savectx(struct pcb *);
137 #endif /* _AMD64_PCB_H_ */