b1d735ba4c
resume that is a superset of a pcb. Move the FPU state out of the pcb and into this new structure. As part of this, move the FPU resume code on amd64 into a C function. This allows resumectx() to still operate only on a pcb and more closely mirrors the i386 code. Reviewed by: kib (earlier version)
155 lines
4.7 KiB
C
155 lines
4.7 KiB
C
/*-
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* Copyright (c) 2003 Peter Wemm.
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)pcb.h 5.10 (Berkeley) 5/12/91
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* $FreeBSD$
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*/
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#ifndef _AMD64_PCB_H_
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#define _AMD64_PCB_H_
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/*
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* AMD64 process control block
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*/
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#include <machine/fpu.h>
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#include <machine/segments.h>
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#ifdef __amd64__
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struct pcb {
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register_t pcb_r15;
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register_t pcb_r14;
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register_t pcb_r13;
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register_t pcb_r12;
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register_t pcb_rbp;
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register_t pcb_rsp;
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register_t pcb_rbx;
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register_t pcb_rip;
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register_t pcb_fsbase;
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register_t pcb_gsbase;
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register_t pcb_kgsbase;
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register_t pcb_cr0;
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register_t pcb_cr2;
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register_t pcb_cr3;
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register_t pcb_cr4;
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register_t pcb_dr0;
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register_t pcb_dr1;
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register_t pcb_dr2;
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register_t pcb_dr3;
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register_t pcb_dr6;
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register_t pcb_dr7;
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struct region_descriptor pcb_gdt;
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struct region_descriptor pcb_idt;
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struct region_descriptor pcb_ldt;
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uint16_t pcb_tr;
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u_int pcb_flags;
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#define PCB_FULL_IRET 0x01 /* full iret is required */
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#define PCB_DBREGS 0x02 /* process using debug registers */
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#define PCB_KERNFPU 0x04 /* kernel uses fpu */
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#define PCB_FPUINITDONE 0x08 /* fpu state is initialized */
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#define PCB_USERFPUINITDONE 0x10 /* fpu user state is initialized */
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#define PCB_32BIT 0x40 /* process has 32 bit context (segs etc) */
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uint16_t pcb_initial_fpucw;
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/* copyin/out fault recovery */
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caddr_t pcb_onfault;
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/* 32-bit segment descriptor */
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struct user_segment_descriptor pcb_gs32sd;
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/* local tss, with i/o bitmap; NULL for common */
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struct amd64tss *pcb_tssp;
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/* model specific registers */
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register_t pcb_efer;
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register_t pcb_star;
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register_t pcb_lstar;
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register_t pcb_cstar;
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register_t pcb_sfmask;
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struct savefpu *pcb_save;
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uint64_t pcb_pad[5];
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};
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/* Per-CPU state saved during suspend and resume. */
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struct susppcb {
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struct pcb sp_pcb;
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/* fpu context for suspend/resume */
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void *sp_fpususpend;
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};
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#endif
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#ifdef _KERNEL
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struct trapframe;
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/*
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* The pcb_flags is only modified by current thread, or by other threads
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* when current thread is stopped. However, current thread may change it
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* from the interrupt context in cpu_switch(), or in the trap handler.
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* When we read-modify-write pcb_flags from C sources, compiler may generate
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* code that is not atomic regarding the interrupt handler. If a trap or
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* interrupt happens and any flag is modified from the handler, it can be
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* clobbered with the cached value later. Therefore, we implement setting
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* and clearing flags with single-instruction functions, which do not race
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* with possible modification of the flags from the trap or interrupt context,
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* because traps and interrupts are executed only on instruction boundary.
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*/
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static __inline void
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set_pcb_flags(struct pcb *pcb, const u_int flags)
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{
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__asm __volatile("orl %1,%0"
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: "=m" (pcb->pcb_flags) : "ir" (flags), "m" (pcb->pcb_flags)
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: "cc");
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}
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static __inline void
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clear_pcb_flags(struct pcb *pcb, const u_int flags)
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{
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__asm __volatile("andl %1,%0"
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: "=m" (pcb->pcb_flags) : "ir" (~flags), "m" (pcb->pcb_flags)
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: "cc");
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}
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void makectx(struct trapframe *, struct pcb *);
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int savectx(struct pcb *) __returns_twice;
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void resumectx(struct pcb *);
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#endif
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#endif /* _AMD64_PCB_H_ */
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