1129198Scognet/*- 2129198Scognet * Copyright (c) 1982, 1986 The Regents of the University of California. 3129198Scognet * Copyright (c) 1989, 1990 William Jolitz 4129198Scognet * Copyright (c) 1994 John Dyson 5129198Scognet * All rights reserved. 6129198Scognet * 7129198Scognet * This code is derived from software contributed to Berkeley by 8129198Scognet * the Systems Programming Group of the University of Utah Computer 9129198Scognet * Science Department, and William Jolitz. 10129198Scognet * 11150868Scognet * Redistribution and use in source and binary :forms, with or without 12129198Scognet * modification, are permitted provided that the following conditions 13129198Scognet * are met: 14129198Scognet * 1. Redistributions of source code must retain the above copyright 15129198Scognet * notice, this list of conditions and the following disclaimer. 16129198Scognet * 2. Redistributions in binary form must reproduce the above copyright 17129198Scognet * notice, this list of conditions and the following disclaimer in the 18129198Scognet * documentation and/or other materials provided with the distribution. 19129198Scognet * 3. All advertising materials mentioning features or use of this software 20129198Scognet * must display the following acknowledgement: 21129198Scognet * This product includes software developed by the University of 22129198Scognet * California, Berkeley and its contributors. 23129198Scognet * 4. Neither the name of the University nor the names of its contributors 24129198Scognet * may be used to endorse or promote products derived from this software 25129198Scognet * without specific prior written permission. 26129198Scognet * 27129198Scognet * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28129198Scognet * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29129198Scognet * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30129198Scognet * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31129198Scognet * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32129198Scognet * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33129198Scognet * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34129198Scognet * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35129198Scognet * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36129198Scognet * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37129198Scognet * SUCH DAMAGE. 38129198Scognet * 39129198Scognet * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 40129198Scognet * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$ 41129198Scognet */ 42129198Scognet 43296861Sbz#include "opt_compat.h" 44296861Sbz 45129198Scognet#include <sys/cdefs.h> 46129198Scognet__FBSDID("$FreeBSD: stable/11/sys/arm/arm/vm_machdep.c 331722 2018-03-29 02:50:57Z eadler $"); 47129198Scognet 48129198Scognet#include <sys/param.h> 49129198Scognet#include <sys/systm.h> 50129198Scognet#include <sys/kernel.h> 51129198Scognet#include <sys/malloc.h> 52129198Scognet#include <sys/mbuf.h> 53129198Scognet#include <sys/proc.h> 54129198Scognet#include <sys/socketvar.h> 55199135Skib#include <sys/syscall.h> 56255786Sglebius#include <sys/sysctl.h> 57199135Skib#include <sys/sysent.h> 58146599Scognet#include <sys/unistd.h> 59284115Sandrew 60129198Scognet#include <machine/cpu.h> 61257200Sian#include <machine/frame.h> 62129198Scognet#include <machine/pcb.h> 63145433Sdavidxu#include <machine/sysarch.h> 64129198Scognet#include <sys/lock.h> 65129198Scognet#include <sys/mutex.h> 66129198Scognet 67129198Scognet#include <vm/vm.h> 68169900Scognet#include <vm/pmap.h> 69129198Scognet#include <vm/vm_extern.h> 70129198Scognet#include <vm/vm_kern.h> 71129198Scognet#include <vm/vm_page.h> 72129198Scognet#include <vm/vm_map.h> 73129198Scognet#include <vm/vm_param.h> 74161105Scognet#include <vm/vm_pageout.h> 75147114Scognet#include <vm/uma.h> 76147114Scognet#include <vm/uma_int.h> 77129198Scognet 78166063Scognet#include <machine/md_var.h> 79263913Sandrew#include <machine/vfp.h> 80166063Scognet 81247864Sandrew/* 82253968Sandrew * struct switchframe and trapframe must both be a multiple of 8 83253968Sandrew * for correct stack alignment. 84247864Sandrew */ 85307136Sed_Static_assert((sizeof(struct switchframe) % 8) == 0, "Bad alignment"); 86307136Sed_Static_assert((sizeof(struct trapframe) % 8) == 0, "Bad alignment"); 87247864Sandrew 88288983Skibuint32_t initial_fpscr = VFPSCR_DN | VFPSCR_FZ; 89288983Skib 90129198Scognet/* 91129198Scognet * Finish a fork operation, with process p2 nearly set up. 92129198Scognet * Copy and update the pcb, set up the stack so that the child 93129198Scognet * ready to run and return to user mode. 94129198Scognet */ 95129198Scognetvoid 96331643Sdimcpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) 97129198Scognet{ 98188019Scognet struct pcb *pcb2; 99129198Scognet struct trapframe *tf; 100129198Scognet struct mdproc *mdp2; 101129198Scognet 102146599Scognet if ((flags & RFPROC) == 0) 103146599Scognet return; 104276190Sian 105276190Sian /* Point the pcb to the top of the stack */ 106276190Sian pcb2 = (struct pcb *) 107276190Sian (td2->td_kstack + td2->td_kstack_pages * PAGE_SIZE) - 1; 108135657Scognet#ifdef __XSCALE__ 109171622Scognet#ifndef CPU_XSCALE_CORE3 110135657Scognet pmap_use_minicache(td2->td_kstack, td2->td_kstack_pages * PAGE_SIZE); 111135657Scognet#endif 112171622Scognet#endif 113317005Smmel#ifdef VFP 114317005Smmel /* Store actual state of VFP */ 115317005Smmel if (curthread == td1) { 116317005Smmel critical_enter(); 117317005Smmel vfp_store(&td1->td_pcb->pcb_vfpstate, false); 118317005Smmel critical_exit(); 119317005Smmel } 120317005Smmel#endif 121129198Scognet td2->td_pcb = pcb2; 122283366Sandrew 123276190Sian /* Clone td1's pcb */ 124129198Scognet bcopy(td1->td_pcb, pcb2, sizeof(*pcb2)); 125283366Sandrew 126276190Sian /* Point to mdproc and then copy over td1's contents */ 127129198Scognet mdp2 = &p2->p_md; 128129198Scognet bcopy(&td1->td_proc->p_md, mdp2, sizeof(*mdp2)); 129276190Sian 130276190Sian /* Point the frame to the stack in front of pcb and copy td1's frame */ 131276190Sian td2->td_frame = (struct trapframe *)pcb2 - 1; 132276190Sian *td2->td_frame = *td1->td_frame; 133276190Sian 134276190Sian /* 135276190Sian * Create a new fresh stack for the new process. 136276190Sian * Copy the trap frame for the return to user mode as if from a 137276190Sian * syscall. This copies most of the user mode register values. 138276190Sian */ 139276190Sian pmap_set_pcb_pagedir(vmspace_pmap(p2->p_vmspace), pcb2); 140276190Sian pcb2->pcb_regs.sf_r4 = (register_t)fork_return; 141276190Sian pcb2->pcb_regs.sf_r5 = (register_t)td2; 142276190Sian pcb2->pcb_regs.sf_lr = (register_t)fork_trampoline; 143276190Sian pcb2->pcb_regs.sf_sp = STACKALIGN(td2->td_frame); 144307136Sed#if __ARM_ARCH >= 6 145307136Sed pcb2->pcb_regs.sf_tpidrurw = (register_t)get_tls(); 146307136Sed#endif 147276190Sian 148262949Sian pcb2->pcb_vfpcpu = -1; 149288983Skib pcb2->pcb_vfpstate.fpscr = initial_fpscr; 150283366Sandrew 151276190Sian tf = td2->td_frame; 152271398Sandrew tf->tf_spsr &= ~PSR_C; 153129198Scognet tf->tf_r0 = 0; 154135657Scognet tf->tf_r1 = 0; 155144637Sjhb 156276190Sian 157170305Sjeff /* Setup to release spin count in fork_exit(). */ 158144637Sjhb td2->td_md.md_spinlock_count = 1; 159297793Spfg td2->td_md.md_saved_cspr = PSR_SVC32_MODE; 160307136Sed#if __ARM_ARCH < 6 161218310Simp td2->td_md.md_tp = *(register_t *)ARM_TP_ADDRESS; 162239268Sgonzo#endif 163129198Scognet} 164283366Sandrew 165129198Scognetvoid 166129198Scognetcpu_thread_swapin(struct thread *td) 167129198Scognet{ 168236991Simp} 169129198Scognet 170236991Simpvoid 171129198Scognetcpu_thread_swapout(struct thread *td) 172236991Simp{ 173129198Scognet} 174129198Scognet 175129198Scognetvoid 176199135Skibcpu_set_syscall_retval(struct thread *td, int error) 177199135Skib{ 178257217Sian struct trapframe *frame; 179199135Skib int fixup; 180199135Skib#ifdef __ARMEB__ 181261564Sandrew u_int call; 182199135Skib#endif 183199135Skib 184199135Skib frame = td->td_frame; 185199135Skib fixup = 0; 186199135Skib 187199135Skib#ifdef __ARMEB__ 188261564Sandrew /* 189261564Sandrew * __syscall returns an off_t while most other syscalls return an 190261564Sandrew * int. As an off_t is 64-bits and an int is 32-bits we need to 191296861Sbz * place the returned data into r1. As the lseek and freebsd6_lseek 192261564Sandrew * syscalls also return an off_t they do not need this fixup. 193261564Sandrew */ 194261564Sandrew call = frame->tf_r7; 195261564Sandrew if (call == SYS___syscall) { 196199135Skib register_t *ap = &frame->tf_r0; 197199135Skib register_t code = ap[_QUAD_LOWWORD]; 198199135Skib if (td->td_proc->p_sysent->sv_mask) 199199135Skib code &= td->td_proc->p_sysent->sv_mask; 200296948Semaste fixup = (code != SYS_lseek); 201199135Skib } 202199135Skib#endif 203199135Skib 204199135Skib switch (error) { 205199135Skib case 0: 206199135Skib if (fixup) { 207199135Skib frame->tf_r0 = 0; 208199135Skib frame->tf_r1 = td->td_retval[0]; 209199135Skib } else { 210199135Skib frame->tf_r0 = td->td_retval[0]; 211199135Skib frame->tf_r1 = td->td_retval[1]; 212199135Skib } 213271398Sandrew frame->tf_spsr &= ~PSR_C; /* carry bit */ 214199135Skib break; 215199135Skib case ERESTART: 216199135Skib /* 217199135Skib * Reconstruct the pc to point at the swi. 218199135Skib */ 219282779Sandrew#if __ARM_ARCH >= 7 220282779Sandrew if ((frame->tf_spsr & PSR_T) != 0) 221282779Sandrew frame->tf_pc -= THUMB_INSN_SIZE; 222282779Sandrew else 223282779Sandrew#endif 224282779Sandrew frame->tf_pc -= INSN_SIZE; 225199135Skib break; 226199135Skib case EJUSTRETURN: 227199135Skib /* nothing to do */ 228199135Skib break; 229199135Skib default: 230199135Skib frame->tf_r0 = error; 231271398Sandrew frame->tf_spsr |= PSR_C; /* carry bit */ 232199135Skib break; 233199135Skib } 234199135Skib} 235199135Skib 236129198Scognet/* 237301961Skib * Initialize machine state, mostly pcb and trap frame for a new 238301961Skib * thread, about to return to userspace. Put enough state in the new 239301961Skib * thread's PCB to get it to go back to the fork_return(), which 240301961Skib * finalizes the thread state and handles peculiarities of the first 241301961Skib * return to userspace for the new thread. 242129198Scognet */ 243129198Scognetvoid 244301961Skibcpu_copy_thread(struct thread *td, struct thread *td0) 245129198Scognet{ 246137214Scognet 247137214Scognet bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe)); 248137214Scognet bcopy(td0->td_pcb, td->td_pcb, sizeof(struct pcb)); 249144637Sjhb 250276190Sian td->td_pcb->pcb_regs.sf_r4 = (register_t)fork_return; 251276190Sian td->td_pcb->pcb_regs.sf_r5 = (register_t)td; 252276190Sian td->td_pcb->pcb_regs.sf_lr = (register_t)fork_trampoline; 253276190Sian td->td_pcb->pcb_regs.sf_sp = STACKALIGN(td->td_frame); 254276190Sian 255276190Sian td->td_frame->tf_spsr &= ~PSR_C; 256276190Sian td->td_frame->tf_r0 = 0; 257276190Sian 258170305Sjeff /* Setup to release spin count in fork_exit(). */ 259144637Sjhb td->td_md.md_spinlock_count = 1; 260276190Sian td->td_md.md_saved_cspr = PSR_SVC32_MODE; 261129198Scognet} 262129198Scognet 263129198Scognet/* 264301961Skib * Set that machine state for performing an upcall that starts 265301961Skib * the entry function with the given argument. 266129198Scognet */ 267129198Scognetvoid 268301961Skibcpu_set_upcall(struct thread *td, void (*entry)(void *), void *arg, 269145433Sdavidxu stack_t *stack) 270129198Scognet{ 271137214Scognet struct trapframe *tf = td->td_frame; 272137214Scognet 273276190Sian tf->tf_usr_sp = STACKALIGN((int)stack->ss_sp + stack->ss_size); 274145433Sdavidxu tf->tf_pc = (int)entry; 275145433Sdavidxu tf->tf_r0 = (int)arg; 276137214Scognet tf->tf_spsr = PSR_USR32_MODE; 277129198Scognet} 278129198Scognet 279147889Sdavidxuint 280145433Sdavidxucpu_set_user_tls(struct thread *td, void *tls_base) 281145433Sdavidxu{ 282145433Sdavidxu 283307136Sed#if __ARM_ARCH >= 6 284307136Sed td->td_pcb->pcb_regs.sf_tpidrurw = (register_t)tls_base; 285307136Sed if (td == curthread) 286307136Sed set_tls(tls_base); 287307136Sed#else 288239268Sgonzo td->td_md.md_tp = (register_t)tls_base; 289239268Sgonzo if (td == curthread) { 290145433Sdavidxu critical_enter(); 291218310Simp *(register_t *)ARM_TP_ADDRESS = (register_t)tls_base; 292145433Sdavidxu critical_exit(); 293145433Sdavidxu } 294307136Sed#endif 295147889Sdavidxu return (0); 296145433Sdavidxu} 297145433Sdavidxu 298145433Sdavidxuvoid 299129198Scognetcpu_thread_exit(struct thread *td) 300129198Scognet{ 301129198Scognet} 302129198Scognet 303129198Scognetvoid 304173615Smarcelcpu_thread_alloc(struct thread *td) 305129198Scognet{ 306236991Simp td->td_pcb = (struct pcb *)(td->td_kstack + td->td_kstack_pages * 307129198Scognet PAGE_SIZE) - 1; 308245942Sandrew /* 309245942Sandrew * Ensure td_frame is aligned to an 8 byte boundary as it will be 310245942Sandrew * placed into the stack pointer which must be 8 byte aligned in 311245942Sandrew * the ARM EABI. 312245942Sandrew */ 313276190Sian td->td_frame = (struct trapframe *)((caddr_t)td->td_pcb) - 1; 314276190Sian 315137214Scognet#ifdef __XSCALE__ 316171622Scognet#ifndef CPU_XSCALE_CORE3 317137214Scognet pmap_use_minicache(td->td_kstack, td->td_kstack_pages * PAGE_SIZE); 318171622Scognet#endif 319236991Simp#endif 320129198Scognet} 321173615Smarcel 322129198Scognetvoid 323173615Smarcelcpu_thread_free(struct thread *td) 324173615Smarcel{ 325173615Smarcel} 326173615Smarcel 327173615Smarcelvoid 328129198Scognetcpu_thread_clean(struct thread *td) 329129198Scognet{ 330129198Scognet} 331129198Scognet 332129198Scognet/* 333129198Scognet * Intercept the return address from a freshly forked process that has NOT 334129198Scognet * been scheduled yet. 335129198Scognet * 336129198Scognet * This is needed to make kernel threads stay in kernel mode. 337129198Scognet */ 338129198Scognetvoid 339301961Skibcpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg) 340129198Scognet{ 341276190Sian td->td_pcb->pcb_regs.sf_r4 = (register_t)func; /* function */ 342276190Sian td->td_pcb->pcb_regs.sf_r5 = (register_t)arg; /* first arg */ 343129198Scognet} 344129198Scognet 345129198Scognet/* 346129198Scognet * Software interrupt handler for queued VM system processing. 347236991Simp */ 348236991Simpvoid 349129198Scognetswi_vm(void *dummy) 350129198Scognet{ 351283366Sandrew 352166063Scognet if (busdma_swi_pending) 353166063Scognet busdma_swi(); 354129198Scognet} 355129198Scognet 356129198Scognetvoid 357129198Scognetcpu_exit(struct thread *td) 358129198Scognet{ 359129198Scognet} 360147114Scognet 361