vm_machdep.c revision 122780
136865Sdfr/*- 236865Sdfr * Copyright (c) 1982, 1986 The Regents of the University of California. 336865Sdfr * Copyright (c) 1989, 1990 William Jolitz 436865Sdfr * Copyright (c) 1994 John Dyson 536865Sdfr * All rights reserved. 636865Sdfr * 736865Sdfr * This code is derived from software contributed to Berkeley by 836865Sdfr * the Systems Programming Group of the University of Utah Computer 936865Sdfr * Science Department, and William Jolitz. 1036865Sdfr * 1136865Sdfr * Redistribution and use in source and binary forms, with or without 1236865Sdfr * modification, are permitted provided that the following conditions 1336865Sdfr * are met: 1436865Sdfr * 1. Redistributions of source code must retain the above copyright 1536865Sdfr * notice, this list of conditions and the following disclaimer. 1636865Sdfr * 2. Redistributions in binary form must reproduce the above copyright 1736865Sdfr * notice, this list of conditions and the following disclaimer in the 1836865Sdfr * documentation and/or other materials provided with the distribution. 1936865Sdfr * 3. All advertising materials mentioning features or use of this software 2036865Sdfr * must display the following acknowledgement: 2136865Sdfr * This product includes software developed by the University of 2236865Sdfr * California, Berkeley and its contributors. 2336865Sdfr * 4. Neither the name of the University nor the names of its contributors 2436865Sdfr * may be used to endorse or promote products derived from this software 2536865Sdfr * without specific prior written permission. 2636865Sdfr * 2736865Sdfr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2836865Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2936865Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3036865Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3136865Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3236865Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3336865Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3436865Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3536865Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3636865Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3736865Sdfr * SUCH DAMAGE. 3836865Sdfr * 3936865Sdfr * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 4036865Sdfr * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$ 4150477Speter * $FreeBSD: head/sys/powerpc/aim/vm_machdep.c 122780 2003-11-16 06:11:26Z alc $ 4236865Sdfr */ 4336865Sdfr/* 4436865Sdfr * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. 4536865Sdfr * All rights reserved. 4636865Sdfr * 4736865Sdfr * Author: Chris G. Demetriou 4836865Sdfr * 4936865Sdfr * Permission to use, copy, modify and distribute this software and 5036865Sdfr * its documentation is hereby granted, provided that both the copyright 5136865Sdfr * notice and this permission notice appear in all copies of the 5236865Sdfr * software, derivative works or modified versions, and any portions 5336865Sdfr * thereof, and that both notices appear in supporting documentation. 5436865Sdfr * 5536865Sdfr * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 5636865Sdfr * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 5736865Sdfr * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 5836865Sdfr * 5936865Sdfr * Carnegie Mellon requests users of this software to return to 6036865Sdfr * 6136865Sdfr * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 6236865Sdfr * School of Computer Science 6336865Sdfr * Carnegie Mellon University 6436865Sdfr * Pittsburgh PA 15213-3890 6536865Sdfr * 6636865Sdfr * any improvements or extensions that they make and grant Carnegie the 6736865Sdfr * rights to redistribute these changes. 6836865Sdfr */ 6936865Sdfr 70118239Speter#include "opt_kstack_pages.h" 71118239Speter 7236865Sdfr#include <sys/param.h> 7336865Sdfr#include <sys/systm.h> 7436865Sdfr#include <sys/proc.h> 7536865Sdfr#include <sys/malloc.h> 7660041Sphk#include <sys/bio.h> 7736865Sdfr#include <sys/buf.h> 7885201Smp#include <sys/ktr.h> 7985201Smp#include <sys/lock.h> 8067365Sjhb#include <sys/mutex.h> 8136865Sdfr#include <sys/vnode.h> 8236865Sdfr#include <sys/vmmeter.h> 8336865Sdfr#include <sys/kernel.h> 84119563Salc#include <sys/mbuf.h> 85122780Salc#include <sys/sf_buf.h> 8636865Sdfr#include <sys/sysctl.h> 8754207Speter#include <sys/unistd.h> 8836865Sdfr 8936865Sdfr#include <machine/clock.h> 9036865Sdfr#include <machine/cpu.h> 9141499Sdfr#include <machine/fpu.h> 9297397Sbenno#include <machine/frame.h> 9336865Sdfr#include <machine/md_var.h> 9436865Sdfr 9578342Sbenno#include <dev/ofw/openfirm.h> 9678342Sbenno 9736865Sdfr#include <vm/vm.h> 9836865Sdfr#include <vm/vm_param.h> 9936865Sdfr#include <vm/vm_kern.h> 10036865Sdfr#include <vm/vm_page.h> 10136865Sdfr#include <vm/vm_map.h> 10236865Sdfr#include <vm/vm_extern.h> 10336865Sdfr 10436865Sdfr#include <sys/user.h> 10536865Sdfr 106119563Salcstatic void sf_buf_init(void *arg); 107119563SalcSYSINIT(sock_sf, SI_SUB_MBUF, SI_ORDER_ANY, sf_buf_init, NULL) 108119563Salc 10936865Sdfr/* 110119563Salc * Expanded sf_freelist head. Really an SLIST_HEAD() in disguise, with the 111119563Salc * sf_freelist head with the sf_lock mutex. 112119563Salc */ 113119563Salcstatic struct { 114119563Salc SLIST_HEAD(, sf_buf) sf_head; 115119563Salc struct mtx sf_lock; 116119563Salc} sf_freelist; 117119563Salc 118119563Salcstatic u_int sf_buf_alloc_want; 119119563Salc 120119563Salc/* 12136865Sdfr * Finish a fork operation, with process p2 nearly set up. 12236865Sdfr * Copy and update the pcb, set up the stack so that the child 12336865Sdfr * ready to run and return to user mode. 12436865Sdfr */ 12536865Sdfrvoid 12690361Sjuliancpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) 12736865Sdfr{ 12884977Sbenno struct proc *p1; 12984977Sbenno struct trapframe *tf; 13084977Sbenno struct callframe *cf; 13190643Sbenno struct pcb *pcb; 13284977Sbenno 13391467Sbenno KASSERT(td1 == curthread || td1 == &thread0, 13490643Sbenno ("cpu_fork: p1 not curproc and not proc0")); 13584977Sbenno CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags); 13684977Sbenno 13784977Sbenno if ((flags & RFPROC) == 0) 13884977Sbenno return; 13984977Sbenno 14084977Sbenno p1 = td1->td_proc; 14184977Sbenno 14291467Sbenno pcb = (struct pcb *)((td2->td_kstack + KSTACK_PAGES * PAGE_SIZE - 14391467Sbenno sizeof(struct pcb)) & ~0x2fU); 14490643Sbenno td2->td_pcb = pcb; 14584977Sbenno 14690643Sbenno /* Copy the pcb */ 14790643Sbenno bcopy(td1->td_pcb, pcb, sizeof(struct pcb)); 14884977Sbenno 14984977Sbenno /* 15090643Sbenno * Create a fresh stack for the new process. 15184977Sbenno * Copy the trap frame for the return to user mode as if from a 15284977Sbenno * syscall. This copies most of the user mode register values. 15384977Sbenno */ 15490643Sbenno tf = (struct trapframe *)pcb - 1; 15590643Sbenno bcopy(td1->td_frame, tf, sizeof(*tf)); 15684977Sbenno 15797397Sbenno /* Set up trap frame. */ 15897397Sbenno tf->fixreg[FIRSTARG] = 0; 15997397Sbenno tf->fixreg[FIRSTARG + 1] = 0; 16097397Sbenno tf->cr &= ~0x10000000; 16190643Sbenno 16290643Sbenno td2->td_frame = tf; 16390643Sbenno 16490643Sbenno cf = (struct callframe *)tf - 1; 16591467Sbenno cf->cf_func = (register_t)fork_return; 16691467Sbenno cf->cf_arg0 = (register_t)td2; 16791467Sbenno cf->cf_arg1 = (register_t)tf; 16884977Sbenno 16991467Sbenno pcb->pcb_sp = (register_t)cf; 17091467Sbenno pcb->pcb_lr = (register_t)fork_trampoline; 171105611Sgrehan pcb->pcb_usr = kernel_pmap->pm_sr[USER_SR]; 17284977Sbenno 17390643Sbenno /* 17490643Sbenno * Now cpu_switch() can schedule the new process. 17590643Sbenno */ 17636865Sdfr} 17736865Sdfr 17836865Sdfr/* 17936865Sdfr * Intercept the return address from a freshly forked process that has NOT 18036865Sdfr * been scheduled yet. 18136865Sdfr * 18236865Sdfr * This is needed to make kernel threads stay in kernel mode. 18336865Sdfr */ 18436865Sdfrvoid 18583682Smpcpu_set_fork_handler(td, func, arg) 18683682Smp struct thread *td; 18792842Salfred void (*func)(void *); 18848391Speter void *arg; 18936865Sdfr{ 19084977Sbenno struct callframe *cf; 19184977Sbenno 19284977Sbenno CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x", 19384977Sbenno (u_int)td, (u_int)func, (u_int)arg); 19484977Sbenno 19591467Sbenno cf = (struct callframe *)td->td_pcb->pcb_sp; 19684977Sbenno 19791467Sbenno cf->cf_func = (register_t)func; 19891467Sbenno cf->cf_arg0 = (register_t)arg; 19936865Sdfr} 20036865Sdfr 20136865Sdfr/* 20236865Sdfr * cpu_exit is called as the last action during exit. 20336865Sdfr * We release the address space of the process, block interrupts, 20436865Sdfr * and call switch_exit. switch_exit switches to proc0's PCB and stack, 20536865Sdfr * then jumps into the middle of cpu_switch, as if it were switching 20636865Sdfr * from proc0. 20736865Sdfr */ 20836865Sdfrvoid 20983682Smpcpu_exit(td) 21083682Smp register struct thread *td; 21136865Sdfr{ 21236865Sdfr} 21336865Sdfr 21436865Sdfrvoid 21598765Sjakecpu_sched_exit(td) 21698765Sjake register struct thread *td; 21798765Sjake{ 21898765Sjake} 21998765Sjake 22083276Speter/* Temporary helper */ 22183276Spetervoid 222118893Sgrehancpu_throw(struct thread *old, struct thread *new) 22383276Speter{ 22483276Speter 225118893Sgrehan cpu_switch(old, new); 22683276Speter panic("cpu_throw() didn't"); 22736865Sdfr} 22836865Sdfr 22936865Sdfr/* 23065557Sjasone * Reset back to firmware. 23136865Sdfr */ 23236865Sdfrvoid 23336865Sdfrcpu_reset() 23436865Sdfr{ 23578342Sbenno OF_exit(); 23636865Sdfr} 23736865Sdfr 23836865Sdfr/* 239119563Salc * Allocate a pool of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-)) 240119563Salc */ 241119563Salcstatic void 242119563Salcsf_buf_init(void *arg) 243119563Salc{ 244119563Salc struct sf_buf *sf_bufs; 245119563Salc vm_offset_t sf_base; 246119563Salc int i; 247119563Salc 248119563Salc mtx_init(&sf_freelist.sf_lock, "sf_bufs list lock", NULL, MTX_DEF); 249119563Salc mtx_lock(&sf_freelist.sf_lock); 250119563Salc SLIST_INIT(&sf_freelist.sf_head); 251119563Salc sf_base = kmem_alloc_nofault(kernel_map, nsfbufs * PAGE_SIZE); 252119563Salc sf_bufs = malloc(nsfbufs * sizeof(struct sf_buf), M_TEMP, 253119563Salc M_NOWAIT | M_ZERO); 254119563Salc for (i = 0; i < nsfbufs; i++) { 255119563Salc sf_bufs[i].kva = sf_base + i * PAGE_SIZE; 256119563Salc SLIST_INSERT_HEAD(&sf_freelist.sf_head, &sf_bufs[i], free_list); 257119563Salc } 258119563Salc sf_buf_alloc_want = 0; 259119563Salc mtx_unlock(&sf_freelist.sf_lock); 260119563Salc} 261119563Salc 262119563Salc/* 263119563Salc * Get an sf_buf from the freelist. Will block if none are available. 264119563Salc */ 265119563Salcstruct sf_buf * 266119563Salcsf_buf_alloc(struct vm_page *m) 267119563Salc{ 268119563Salc struct sf_buf *sf; 269119563Salc int error; 270119563Salc 271119563Salc mtx_lock(&sf_freelist.sf_lock); 272119563Salc while ((sf = SLIST_FIRST(&sf_freelist.sf_head)) == NULL) { 273119563Salc sf_buf_alloc_want++; 274119563Salc error = msleep(&sf_freelist, &sf_freelist.sf_lock, PVM|PCATCH, 275119563Salc "sfbufa", 0); 276119563Salc sf_buf_alloc_want--; 277119563Salc 278119563Salc /* 279119563Salc * If we got a signal, don't risk going back to sleep. 280119563Salc */ 281119563Salc if (error) 282119563Salc break; 283119563Salc } 284119563Salc if (sf != NULL) { 285119563Salc SLIST_REMOVE_HEAD(&sf_freelist.sf_head, free_list); 286119563Salc sf->m = m; 287119563Salc pmap_qenter(sf->kva, &sf->m, 1); 288119563Salc } 289119563Salc mtx_unlock(&sf_freelist.sf_lock); 290119563Salc return (sf); 291119563Salc} 292119563Salc 293119563Salc/* 294119563Salc * Detatch mapped page and release resources back to the system. 295119563Salc */ 296119563Salcvoid 297119563Salcsf_buf_free(void *addr, void *args) 298119563Salc{ 299119563Salc struct sf_buf *sf; 300119563Salc struct vm_page *m; 301119563Salc 302119563Salc sf = args; 303119563Salc pmap_qremove((vm_offset_t)addr, 1); 304119563Salc m = sf->m; 305119563Salc vm_page_lock_queues(); 306119563Salc vm_page_unwire(m, 0); 307119563Salc /* 308119563Salc * Check for the object going away on us. This can 309119563Salc * happen since we don't hold a reference to it. 310119563Salc * If so, we're responsible for freeing the page. 311119563Salc */ 312119563Salc if (m->wire_count == 0 && m->object == NULL) 313119563Salc vm_page_free(m); 314119563Salc vm_page_unlock_queues(); 315119563Salc sf->m = NULL; 316119563Salc mtx_lock(&sf_freelist.sf_lock); 317119563Salc SLIST_INSERT_HEAD(&sf_freelist.sf_head, sf, free_list); 318119563Salc if (sf_buf_alloc_want > 0) 319119563Salc wakeup_one(&sf_freelist); 320119563Salc mtx_unlock(&sf_freelist.sf_lock); 321119563Salc} 322119563Salc 323119563Salc/* 32436865Sdfr * Software interrupt handler for queued VM system processing. 32536865Sdfr */ 32636865Sdfrvoid 32767551Sjhbswi_vm(void *dummy) 32836865Sdfr{ 32978342Sbenno#if 0 /* XXX: Don't have busdma stuff yet */ 33036865Sdfr if (busdma_swi_pending != 0) 33136865Sdfr busdma_swi(); 33278342Sbenno#endif 33336865Sdfr} 33436865Sdfr 33536865Sdfr/* 33636865Sdfr * Tell whether this address is in some physical memory region. 33736865Sdfr * Currently used by the kernel coredump code in order to avoid 33836865Sdfr * dumping the ``ISA memory hole'' which could cause indefinite hangs, 33936865Sdfr * or other unpredictable behaviour. 34036865Sdfr */ 34136865Sdfr 34236865Sdfr 34336865Sdfrint 34436865Sdfris_physical_memory(addr) 34536865Sdfr vm_offset_t addr; 34636865Sdfr{ 34736865Sdfr /* 34836865Sdfr * stuff other tests for known memory-mapped devices (PCI?) 34936865Sdfr * here 35036865Sdfr */ 35136865Sdfr 35236865Sdfr return 1; 35336865Sdfr} 35499659Sbenno 35599659Sbenno/* 35699659Sbenno * KSE functions 35799659Sbenno */ 35899659Sbennovoid 35999659Sbennocpu_thread_exit(struct thread *td) 36099659Sbenno{ 36199659Sbenno} 36299659Sbenno 36399659Sbennovoid 364107719Sjuliancpu_thread_clean(struct thread *td) 365107180Smux{ 366107180Smux} 367107180Smux 368107180Smuxvoid 36999659Sbennocpu_thread_setup(struct thread *td) 37099659Sbenno{ 371119004Smarcel} 37299659Sbenno 373119004Smarcelvoid 374119004Smarcelcpu_thread_swapin(struct thread *td) 375119004Smarcel{ 37699659Sbenno} 37799659Sbenno 37899659Sbennovoid 379119004Smarcelcpu_thread_swapout(struct thread *td) 380119004Smarcel{ 381119004Smarcel} 382119004Smarcel 383119004Smarcelvoid 384115858Smarcelcpu_set_upcall(struct thread *td, struct thread *td0) 38599659Sbenno{ 38699659Sbenno} 38799659Sbenno 38899659Sbennovoid 389111028Sjeffcpu_set_upcall_kse(struct thread *td, struct kse_upcall *ku) 39099659Sbenno{ 39199659Sbenno} 392