535 lines
14 KiB
C
535 lines
14 KiB
C
/*-
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* Copyright (c) 1982, 1986 The Regents of the University of California.
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* Copyright (c) 1989, 1990 William Jolitz
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* Copyright (c) 1994 John Dyson
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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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* the Systems Programming Group of the University of Utah Computer
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* Science Department, and 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
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* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_isa.h"
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#include "opt_cpu.h"
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/kse.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/pioctl.h>
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#include <sys/proc.h>
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#include <sys/sf_buf.h>
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#include <sys/smp.h>
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#include <sys/sysctl.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <sys/vmmeter.h>
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#include <machine/cpu.h>
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#include <machine/md_var.h>
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#include <machine/pcb.h>
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#include <machine/specialreg.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_page.h>
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#include <vm/vm_map.h>
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#include <vm/vm_param.h>
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#include <amd64/isa/isa.h>
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#ifdef COMPAT_IA32
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extern struct sysentvec ia32_freebsd_sysvec;
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#endif
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static void cpu_reset_real(void);
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#ifdef SMP
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static void cpu_reset_proxy(void);
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static u_int cpu_reset_proxyid;
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static volatile u_int cpu_reset_proxy_active;
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#endif
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/*
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* Finish a fork operation, with process p2 nearly set up.
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* Copy and update the pcb, set up the stack so that the child
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* ready to run and return to user mode.
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*/
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void
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cpu_fork(td1, p2, td2, flags)
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register struct thread *td1;
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register struct proc *p2;
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struct thread *td2;
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int flags;
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{
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register struct proc *p1;
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struct pcb *pcb2;
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struct mdproc *mdp2;
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p1 = td1->td_proc;
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if ((flags & RFPROC) == 0)
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return;
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/* Ensure that p1's pcb is up to date. */
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fpuexit(td1);
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/* Point the pcb to the top of the stack */
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pcb2 = (struct pcb *)(td2->td_kstack +
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td2->td_kstack_pages * PAGE_SIZE) - 1;
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td2->td_pcb = pcb2;
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/* Copy p1's pcb */
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bcopy(td1->td_pcb, pcb2, sizeof(*pcb2));
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/* Point mdproc and then copy over td1's contents */
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mdp2 = &p2->p_md;
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bcopy(&p1->p_md, mdp2, sizeof(*mdp2));
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/*
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* Create a new fresh stack for the new process.
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* Copy the trap frame for the return to user mode as if from a
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* syscall. This copies most of the user mode register values.
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*/
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td2->td_frame = (struct trapframe *)td2->td_pcb - 1;
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bcopy(td1->td_frame, td2->td_frame, sizeof(struct trapframe));
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td2->td_frame->tf_rax = 0; /* Child returns zero */
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td2->td_frame->tf_rflags &= ~PSL_C; /* success */
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td2->td_frame->tf_rdx = 1;
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/*
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* If the parent process has the trap bit set (i.e. a debugger had
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* single stepped the process to the system call), we need to clear
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* the trap flag from the new frame unless the debugger had set PF_FORK
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* on the parent. Otherwise, the child will receive a (likely
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* unexpected) SIGTRAP when it executes the first instruction after
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* returning to userland.
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*/
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if ((p1->p_pfsflags & PF_FORK) == 0)
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td2->td_frame->tf_rflags &= ~PSL_T;
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/*
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* Set registers for trampoline to user mode. Leave space for the
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* return address on stack. These are the kernel mode register values.
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*/
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pcb2->pcb_cr3 = vtophys(vmspace_pmap(p2->p_vmspace)->pm_pml4);
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pcb2->pcb_r12 = (register_t)fork_return; /* fork_trampoline argument */
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pcb2->pcb_rbp = 0;
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pcb2->pcb_rsp = (register_t)td2->td_frame - sizeof(void *);
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pcb2->pcb_rbx = (register_t)td2; /* fork_trampoline argument */
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pcb2->pcb_rip = (register_t)fork_trampoline;
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/*-
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* pcb2->pcb_dr*: cloned above.
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* pcb2->pcb_savefpu: cloned above.
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* pcb2->pcb_flags: cloned above.
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* pcb2->pcb_onfault: cloned above (always NULL here?).
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* pcb2->pcb_[fg]sbase: cloned above
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*/
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/* Setup to release sched_lock in fork_exit(). */
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td2->td_md.md_spinlock_count = 1;
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td2->td_md.md_saved_flags = PSL_KERNEL | PSL_I;
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/*
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* Now, cpu_switch() can schedule the new process.
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* pcb_rsp is loaded pointing to the cpu_switch() stack frame
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* containing the return address when exiting cpu_switch.
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* This will normally be to fork_trampoline(), which will have
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* %ebx loaded with the new proc's pointer. fork_trampoline()
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* will set up a stack to call fork_return(p, frame); to complete
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* the return to user-mode.
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*/
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}
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/*
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* Intercept the return address from a freshly forked process that has NOT
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* been scheduled yet.
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*
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* This is needed to make kernel threads stay in kernel mode.
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*/
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void
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cpu_set_fork_handler(td, func, arg)
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struct thread *td;
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void (*func)(void *);
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void *arg;
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{
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/*
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* Note that the trap frame follows the args, so the function
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* is really called like this: func(arg, frame);
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*/
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td->td_pcb->pcb_r12 = (long) func; /* function */
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td->td_pcb->pcb_rbx = (long) arg; /* first arg */
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}
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void
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cpu_exit(struct thread *td)
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{
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}
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void
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cpu_thread_exit(struct thread *td)
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{
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if (td == PCPU_GET(fpcurthread))
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fpudrop();
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/* Disable any hardware breakpoints. */
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if (td->td_pcb->pcb_flags & PCB_DBREGS) {
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reset_dbregs();
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td->td_pcb->pcb_flags &= ~PCB_DBREGS;
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}
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}
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void
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cpu_thread_clean(struct thread *td)
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{
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}
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void
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cpu_thread_swapin(struct thread *td)
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{
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}
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void
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cpu_thread_swapout(struct thread *td)
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{
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}
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void
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cpu_thread_setup(struct thread *td)
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{
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td->td_pcb = (struct pcb *)(td->td_kstack +
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td->td_kstack_pages * PAGE_SIZE) - 1;
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td->td_frame = (struct trapframe *)td->td_pcb - 1;
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}
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/*
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* Initialize machine state (pcb and trap frame) for a new thread about to
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* upcall. Put enough state in the new thread's PCB to get it to go back
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* userret(), where we can intercept it again to set the return (upcall)
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* Address and stack, along with those from upcals that are from other sources
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* such as those generated in thread_userret() itself.
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*/
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void
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cpu_set_upcall(struct thread *td, struct thread *td0)
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{
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struct pcb *pcb2;
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/* Point the pcb to the top of the stack. */
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pcb2 = td->td_pcb;
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/*
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* Copy the upcall pcb. This loads kernel regs.
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* Those not loaded individually below get their default
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* values here.
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*
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* XXXKSE It might be a good idea to simply skip this as
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* the values of the other registers may be unimportant.
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* This would remove any requirement for knowing the KSE
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* at this time (see the matching comment below for
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* more analysis) (need a good safe default).
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*/
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bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
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pcb2->pcb_flags &= ~PCB_FPUINITDONE;
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/*
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* Create a new fresh stack for the new thread.
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* Don't forget to set this stack value into whatever supplies
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* the address for the fault handlers.
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* The contexts are filled in at the time we actually DO the
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* upcall as only then do we know which KSE we got.
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*/
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bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));
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/*
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* Set registers for trampoline to user mode. Leave space for the
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* return address on stack. These are the kernel mode register values.
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*/
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pcb2->pcb_cr3 = vtophys(vmspace_pmap(td->td_proc->p_vmspace)->pm_pml4);
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pcb2->pcb_r12 = (register_t)fork_return; /* trampoline arg */
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pcb2->pcb_rbp = 0;
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pcb2->pcb_rsp = (register_t)td->td_frame - sizeof(void *); /* trampoline arg */
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pcb2->pcb_rbx = (register_t)td; /* trampoline arg */
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pcb2->pcb_rip = (register_t)fork_trampoline;
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/*
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* If we didn't copy the pcb, we'd need to do the following registers:
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* pcb2->pcb_dr*: cloned above.
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* pcb2->pcb_savefpu: cloned above.
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* pcb2->pcb_onfault: cloned above (always NULL here?).
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* pcb2->pcb_[fg]sbase: cloned above
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*/
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/* Setup to release sched_lock in fork_exit(). */
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td->td_md.md_spinlock_count = 1;
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td->td_md.md_saved_flags = PSL_KERNEL | PSL_I;
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}
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/*
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* Set that machine state for performing an upcall that has to
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* be done in thread_userret() so that those upcalls generated
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* in thread_userret() itself can be done as well.
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*/
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void
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cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg,
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stack_t *stack)
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{
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/*
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* Do any extra cleaning that needs to be done.
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* The thread may have optional components
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* that are not present in a fresh thread.
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* This may be a recycled thread so make it look
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* as though it's newly allocated.
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*/
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cpu_thread_clean(td);
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#ifdef COMPAT_IA32
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if (td->td_proc->p_sysent == &ia32_freebsd_sysvec) {
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/*
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* Set the trap frame to point at the beginning of the uts
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* function.
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*/
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td->td_frame->tf_rbp = 0;
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td->td_frame->tf_rsp =
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(((uintptr_t)stack->ss_sp + stack->ss_size - 4) & ~0x0f) - 4;
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td->td_frame->tf_rip = (uintptr_t)entry;
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/*
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* Pass the address of the mailbox for this kse to the uts
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* function as a parameter on the stack.
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*/
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suword32((void *)(td->td_frame->tf_rsp + sizeof(int32_t)),
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(uint32_t)(uintptr_t)arg);
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return;
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}
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#endif
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/*
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* Set the trap frame to point at the beginning of the uts
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* function.
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*/
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td->td_frame->tf_rbp = 0;
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td->td_frame->tf_rsp =
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((register_t)stack->ss_sp + stack->ss_size) & ~0x0f;
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td->td_frame->tf_rsp -= 8;
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td->td_frame->tf_rip = (register_t)entry;
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/*
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* Pass the address of the mailbox for this kse to the uts
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* function as a parameter on the stack.
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*/
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td->td_frame->tf_rdi = (register_t)arg;
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}
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int
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cpu_set_user_tls(struct thread *td, void *tls_base)
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{
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if ((u_int64_t)tls_base >= VM_MAXUSER_ADDRESS)
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return (EINVAL);
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#ifdef COMPAT_IA32
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if (td->td_proc->p_sysent == &ia32_freebsd_sysvec) {
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if (td == curthread) {
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critical_enter();
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td->td_pcb->pcb_gsbase = (register_t)tls_base;
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wrmsr(MSR_KGSBASE, td->td_pcb->pcb_gsbase);
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critical_exit();
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} else {
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td->td_pcb->pcb_gsbase = (register_t)tls_base;
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}
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return (0);
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}
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#endif
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if (td == curthread) {
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critical_enter();
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td->td_pcb->pcb_fsbase = (register_t)tls_base;
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wrmsr(MSR_FSBASE, td->td_pcb->pcb_fsbase);
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critical_exit();
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} else {
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td->td_pcb->pcb_fsbase = (register_t)tls_base;
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}
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return (0);
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}
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#ifdef SMP
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static void
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cpu_reset_proxy()
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{
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cpu_reset_proxy_active = 1;
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while (cpu_reset_proxy_active == 1)
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; /* Wait for other cpu to see that we've started */
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stop_cpus((1<<cpu_reset_proxyid));
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printf("cpu_reset_proxy: Stopped CPU %d\n", cpu_reset_proxyid);
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DELAY(1000000);
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cpu_reset_real();
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}
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#endif
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void
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cpu_reset()
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{
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#ifdef SMP
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u_int cnt, map;
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if (smp_active) {
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map = PCPU_GET(other_cpus) & ~stopped_cpus;
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if (map != 0) {
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printf("cpu_reset: Stopping other CPUs\n");
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stop_cpus(map);
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}
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if (PCPU_GET(cpuid) != 0) {
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cpu_reset_proxyid = PCPU_GET(cpuid);
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cpustop_restartfunc = cpu_reset_proxy;
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cpu_reset_proxy_active = 0;
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printf("cpu_reset: Restarting BSP\n");
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/* Restart CPU #0. */
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atomic_store_rel_int(&started_cpus, 1 << 0);
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cnt = 0;
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while (cpu_reset_proxy_active == 0 && cnt < 10000000)
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cnt++; /* Wait for BSP to announce restart */
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if (cpu_reset_proxy_active == 0)
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printf("cpu_reset: Failed to restart BSP\n");
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enable_intr();
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cpu_reset_proxy_active = 2;
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while (1);
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/* NOTREACHED */
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}
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DELAY(1000000);
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}
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#endif
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cpu_reset_real();
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/* NOTREACHED */
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}
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static void
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cpu_reset_real()
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{
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/*
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* Attempt to do a CPU reset via the keyboard controller,
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* do not turn off GateA20, as any machine that fails
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* to do the reset here would then end up in no man's land.
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*/
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outb(IO_KBD + 4, 0xFE);
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DELAY(500000); /* wait 0.5 sec to see if that did it */
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printf("Keyboard reset did not work, attempting CPU shutdown\n");
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DELAY(1000000); /* wait 1 sec for printf to complete */
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/* Force a shutdown by unmapping entire address space. */
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bzero((caddr_t)PML4map, PAGE_SIZE);
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/* "good night, sweet prince .... <THUNK!>" */
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invltlb();
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/* NOTREACHED */
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while(1);
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}
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/*
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* Allocate an sf_buf for the given vm_page. On this machine, however, there
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* is no sf_buf object. Instead, an opaque pointer to the given vm_page is
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* returned.
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*/
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struct sf_buf *
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sf_buf_alloc(struct vm_page *m, int pri)
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{
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return ((struct sf_buf *)m);
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}
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/*
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* Free the sf_buf. In fact, do nothing because there are no resources
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* associated with the sf_buf.
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*/
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void
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sf_buf_free(struct sf_buf *sf)
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{
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}
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/*
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* Software interrupt handler for queued VM system processing.
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*/
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void
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swi_vm(void *dummy)
|
|
{
|
|
if (busdma_swi_pending != 0)
|
|
busdma_swi();
|
|
}
|
|
|
|
/*
|
|
* Tell whether this address is in some physical memory region.
|
|
* Currently used by the kernel coredump code in order to avoid
|
|
* dumping the ``ISA memory hole'' which could cause indefinite hangs,
|
|
* or other unpredictable behaviour.
|
|
*/
|
|
|
|
int
|
|
is_physical_memory(vm_paddr_t addr)
|
|
{
|
|
|
|
#ifdef DEV_ISA
|
|
/* The ISA ``memory hole''. */
|
|
if (addr >= 0xa0000 && addr < 0x100000)
|
|
return 0;
|
|
#endif
|
|
|
|
/*
|
|
* stuff other tests for known memory-mapped devices (PCI?)
|
|
* here
|
|
*/
|
|
|
|
return 1;
|
|
}
|