vm_machdep.c revision 170305
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 170305 2007-06-04 23:57:32Z jeff $ 4236865Sdfr */ 43139825Simp/*- 4436865Sdfr * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. 4536865Sdfr * All rights reserved. 4636865Sdfr * 4736865Sdfr * Author: Chris G. Demetriou 48126474Sgrehan * 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. 54126474Sgrehan * 55126474Sgrehan * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 56126474Sgrehan * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 5736865Sdfr * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 58126474Sgrehan * 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 7036865Sdfr#include <sys/param.h> 7136865Sdfr#include <sys/systm.h> 7236865Sdfr#include <sys/proc.h> 7336865Sdfr#include <sys/malloc.h> 7460041Sphk#include <sys/bio.h> 7536865Sdfr#include <sys/buf.h> 7685201Smp#include <sys/ktr.h> 7785201Smp#include <sys/lock.h> 7867365Sjhb#include <sys/mutex.h> 7936865Sdfr#include <sys/vnode.h> 8036865Sdfr#include <sys/vmmeter.h> 8136865Sdfr#include <sys/kernel.h> 82119563Salc#include <sys/mbuf.h> 83122780Salc#include <sys/sf_buf.h> 8436865Sdfr#include <sys/sysctl.h> 8554207Speter#include <sys/unistd.h> 8636865Sdfr 8736865Sdfr#include <machine/cpu.h> 8841499Sdfr#include <machine/fpu.h> 8997397Sbenno#include <machine/frame.h> 9036865Sdfr#include <machine/md_var.h> 91138129Sdas#include <machine/pcb.h> 92165608Smarcel#include <machine/powerpc.h> 9336865Sdfr 9478342Sbenno#include <dev/ofw/openfirm.h> 9578342Sbenno 9636865Sdfr#include <vm/vm.h> 9736865Sdfr#include <vm/vm_param.h> 9836865Sdfr#include <vm/vm_kern.h> 9936865Sdfr#include <vm/vm_page.h> 10036865Sdfr#include <vm/vm_map.h> 10136865Sdfr#include <vm/vm_extern.h> 10236865Sdfr 10336865Sdfr/* 10436865Sdfr * Finish a fork operation, with process p2 nearly set up. 10536865Sdfr * Copy and update the pcb, set up the stack so that the child 10636865Sdfr * ready to run and return to user mode. 10736865Sdfr */ 10836865Sdfrvoid 10990361Sjuliancpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) 11036865Sdfr{ 11184977Sbenno struct proc *p1; 11284977Sbenno struct trapframe *tf; 11384977Sbenno struct callframe *cf; 11490643Sbenno struct pcb *pcb; 11584977Sbenno 11691467Sbenno KASSERT(td1 == curthread || td1 == &thread0, 11790643Sbenno ("cpu_fork: p1 not curproc and not proc0")); 11884977Sbenno CTR3(KTR_PROC, "cpu_fork: called td1=%08x p2=%08x flags=%x", (u_int)td1, (u_int)p2, flags); 11984977Sbenno 12084977Sbenno if ((flags & RFPROC) == 0) 12184977Sbenno return; 12284977Sbenno 12384977Sbenno p1 = td1->td_proc; 12484977Sbenno 125127582Speter pcb = (struct pcb *)((td2->td_kstack + 126127582Speter td2->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb)) & ~0x2fU); 12790643Sbenno td2->td_pcb = pcb; 12884977Sbenno 12990643Sbenno /* Copy the pcb */ 13090643Sbenno bcopy(td1->td_pcb, pcb, sizeof(struct pcb)); 13184977Sbenno 13284977Sbenno /* 13390643Sbenno * Create a fresh stack for the new process. 13484977Sbenno * Copy the trap frame for the return to user mode as if from a 13584977Sbenno * syscall. This copies most of the user mode register values. 13684977Sbenno */ 13790643Sbenno tf = (struct trapframe *)pcb - 1; 13890643Sbenno bcopy(td1->td_frame, tf, sizeof(*tf)); 13984977Sbenno 14097397Sbenno /* Set up trap frame. */ 14197397Sbenno tf->fixreg[FIRSTARG] = 0; 14297397Sbenno tf->fixreg[FIRSTARG + 1] = 0; 14397397Sbenno tf->cr &= ~0x10000000; 14490643Sbenno 14590643Sbenno td2->td_frame = tf; 14690643Sbenno 14790643Sbenno cf = (struct callframe *)tf - 1; 148132520Sgrehan memset(cf, 0, sizeof(struct callframe)); 14991467Sbenno cf->cf_func = (register_t)fork_return; 15091467Sbenno cf->cf_arg0 = (register_t)td2; 15191467Sbenno cf->cf_arg1 = (register_t)tf; 15284977Sbenno 15391467Sbenno pcb->pcb_sp = (register_t)cf; 15491467Sbenno pcb->pcb_lr = (register_t)fork_trampoline; 155105611Sgrehan pcb->pcb_usr = kernel_pmap->pm_sr[USER_SR]; 15684977Sbenno 157170305Sjeff /* Setup to release spin count in fork_exit(). */ 158144637Sjhb td2->td_md.md_spinlock_count = 1; 159144637Sjhb td2->td_md.md_saved_msr = PSL_KERNSET; 160144637Sjhb 16190643Sbenno /* 16290643Sbenno * Now cpu_switch() can schedule the new process. 16390643Sbenno */ 16436865Sdfr} 16536865Sdfr 16636865Sdfr/* 16736865Sdfr * Intercept the return address from a freshly forked process that has NOT 16836865Sdfr * been scheduled yet. 16936865Sdfr * 17036865Sdfr * This is needed to make kernel threads stay in kernel mode. 17136865Sdfr */ 17236865Sdfrvoid 17383682Smpcpu_set_fork_handler(td, func, arg) 17483682Smp struct thread *td; 17592842Salfred void (*func)(void *); 17648391Speter void *arg; 17736865Sdfr{ 17884977Sbenno struct callframe *cf; 17984977Sbenno 18084977Sbenno CTR3(KTR_PROC, "cpu_set_fork_handler: called with td=%08x func=%08x arg=%08x", 18184977Sbenno (u_int)td, (u_int)func, (u_int)arg); 18284977Sbenno 18391467Sbenno cf = (struct callframe *)td->td_pcb->pcb_sp; 18484977Sbenno 18591467Sbenno cf->cf_func = (register_t)func; 18691467Sbenno cf->cf_arg0 = (register_t)arg; 18736865Sdfr} 18836865Sdfr 18936865Sdfrvoid 19083682Smpcpu_exit(td) 19183682Smp register struct thread *td; 19236865Sdfr{ 19336865Sdfr} 19436865Sdfr 19583276Speter/* Temporary helper */ 19683276Spetervoid 197118893Sgrehancpu_throw(struct thread *old, struct thread *new) 19883276Speter{ 19983276Speter 200118893Sgrehan cpu_switch(old, new); 20183276Speter panic("cpu_throw() didn't"); 20236865Sdfr} 20336865Sdfr 20436865Sdfr/* 20565557Sjasone * Reset back to firmware. 20636865Sdfr */ 20736865Sdfrvoid 20836865Sdfrcpu_reset() 20936865Sdfr{ 210165608Smarcel OF_reboot(); 21136865Sdfr} 21236865Sdfr 21336865Sdfr/* 214128395Salc * Allocate an sf_buf for the given vm_page. On this machine, however, there 215128395Salc * is no sf_buf object. Instead, an opaque pointer to the given vm_page is 216128395Salc * returned. 217119563Salc */ 218119563Salcstruct sf_buf * 219127788Salcsf_buf_alloc(struct vm_page *m, int pri) 220119563Salc{ 221119563Salc 222128395Salc return ((struct sf_buf *)m); 223119563Salc} 224119563Salc 225119563Salc/* 226128395Salc * Free the sf_buf. In fact, do nothing because there are no resources 227128395Salc * associated with the sf_buf. 228119563Salc */ 229119563Salcvoid 230127086Salcsf_buf_free(struct sf_buf *sf) 231119563Salc{ 232119563Salc} 233119563Salc 234119563Salc/* 23536865Sdfr * Software interrupt handler for queued VM system processing. 236126474Sgrehan */ 237126474Sgrehanvoid 238126474Sgrehanswi_vm(void *dummy) 239126474Sgrehan{ 24078342Sbenno#if 0 /* XXX: Don't have busdma stuff yet */ 24136865Sdfr if (busdma_swi_pending != 0) 24236865Sdfr busdma_swi(); 24378342Sbenno#endif 24436865Sdfr} 24536865Sdfr 24636865Sdfr/* 24736865Sdfr * Tell whether this address is in some physical memory region. 24836865Sdfr * Currently used by the kernel coredump code in order to avoid 24936865Sdfr * dumping the ``ISA memory hole'' which could cause indefinite hangs, 25036865Sdfr * or other unpredictable behaviour. 25136865Sdfr */ 25236865Sdfr 25336865Sdfr 25436865Sdfrint 25536865Sdfris_physical_memory(addr) 25636865Sdfr vm_offset_t addr; 25736865Sdfr{ 25836865Sdfr /* 25936865Sdfr * stuff other tests for known memory-mapped devices (PCI?) 26036865Sdfr * here 26136865Sdfr */ 26236865Sdfr 26336865Sdfr return 1; 26436865Sdfr} 26599659Sbenno 26699659Sbenno/* 26799659Sbenno * KSE functions 26899659Sbenno */ 26999659Sbennovoid 270126474Sgrehancpu_thread_exit(struct thread *td) 27199659Sbenno{ 27299659Sbenno} 27399659Sbenno 27499659Sbennovoid 275126474Sgrehancpu_thread_clean(struct thread *td) 276107180Smux{ 277107180Smux} 278107180Smux 279107180Smuxvoid 28099659Sbennocpu_thread_setup(struct thread *td) 28199659Sbenno{ 282126474Sgrehan struct pcb *pcb; 283126474Sgrehan 284127618Sbenno pcb = (struct pcb *)((td->td_kstack + td->td_kstack_pages * PAGE_SIZE - 285126474Sgrehan sizeof(struct pcb)) & ~0x2fU); 286126474Sgrehan td->td_pcb = pcb; 287126474Sgrehan td->td_frame = (struct trapframe *)pcb - 1; 288119004Smarcel} 28999659Sbenno 290119004Smarcelvoid 291119004Smarcelcpu_thread_swapin(struct thread *td) 292119004Smarcel{ 29399659Sbenno} 29499659Sbenno 29599659Sbennovoid 296119004Smarcelcpu_thread_swapout(struct thread *td) 297119004Smarcel{ 298119004Smarcel} 299119004Smarcel 300119004Smarcelvoid 301115858Smarcelcpu_set_upcall(struct thread *td, struct thread *td0) 30299659Sbenno{ 303126474Sgrehan struct pcb *pcb2; 304126474Sgrehan struct trapframe *tf; 305126474Sgrehan struct callframe *cf; 306126474Sgrehan 307126474Sgrehan pcb2 = td->td_pcb; 308126474Sgrehan 309126474Sgrehan /* Copy the upcall pcb */ 310126474Sgrehan bcopy(td0->td_pcb, pcb2, sizeof(*pcb2)); 311126474Sgrehan 312126474Sgrehan /* Create a stack for the new thread */ 313126474Sgrehan tf = td->td_frame; 314126474Sgrehan bcopy(td0->td_frame, tf, sizeof(struct trapframe)); 315126474Sgrehan tf->fixreg[FIRSTARG] = 0; 316126474Sgrehan tf->fixreg[FIRSTARG + 1] = 0; 317126474Sgrehan tf->cr &= ~0x10000000; 318126474Sgrehan 319126474Sgrehan /* Set registers for trampoline to user mode. */ 320126474Sgrehan cf = (struct callframe *)tf - 1; 321132520Sgrehan memset(cf, 0, sizeof(struct callframe)); 322126474Sgrehan cf->cf_func = (register_t)fork_return; 323126474Sgrehan cf->cf_arg0 = (register_t)td; 324126474Sgrehan cf->cf_arg1 = (register_t)tf; 325126474Sgrehan 326126474Sgrehan pcb2->pcb_sp = (register_t)cf; 327126474Sgrehan pcb2->pcb_lr = (register_t)fork_trampoline; 328126474Sgrehan pcb2->pcb_usr = kernel_pmap->pm_sr[USER_SR]; 329144637Sjhb 330170305Sjeff /* Setup to release spin count in fork_exit(). */ 331144637Sjhb td->td_md.md_spinlock_count = 1; 332144637Sjhb td->td_md.md_saved_msr = PSL_KERNSET; 33399659Sbenno} 33499659Sbenno 33599659Sbennovoid 336145433Sdavidxucpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg, 337145433Sdavidxu stack_t *stack) 33899659Sbenno{ 339126474Sgrehan struct trapframe *tf; 340126474Sgrehan uint32_t sp; 341126474Sgrehan 342126474Sgrehan tf = td->td_frame; 343126474Sgrehan /* align stack and alloc space for frame ptr and saved LR */ 344145433Sdavidxu sp = ((uint32_t)stack->ss_sp + stack->ss_size 345126474Sgrehan - 2*sizeof(u_int32_t)) & ~0x1f; 346126474Sgrehan bzero(tf, sizeof(struct trapframe)); 347126474Sgrehan 348126474Sgrehan tf->fixreg[1] = (register_t)sp; 349145433Sdavidxu tf->fixreg[3] = (register_t)arg; 350145433Sdavidxu tf->srr0 = (register_t)entry; 351126474Sgrehan tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT; 352126474Sgrehan td->td_pcb->pcb_flags = 0; 353126474Sgrehan 354145433Sdavidxu td->td_retval[0] = (register_t)entry; 355126474Sgrehan td->td_retval[1] = 0; 35699659Sbenno} 357145433Sdavidxu 358147889Sdavidxuint 359145433Sdavidxucpu_set_user_tls(struct thread *td, void *tls_base) 360145433Sdavidxu{ 361145433Sdavidxu 362161797Smarcel td->td_frame->fixreg[2] = (register_t)tls_base + 0x7008; 363147889Sdavidxu return (0); 364145433Sdavidxu} 365