vm_machdep.c revision 288492
1/*- 2 * Copyright (c) 1982, 1986 The Regents of the University of California. 3 * Copyright (c) 1989, 1990 William Jolitz 4 * Copyright (c) 1994 John Dyson 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department, and William Jolitz. 10 * 11 * Redistribution and use in source and binary :forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 40 * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$ 41 */ 42 43#include <sys/cdefs.h> 44__FBSDID("$FreeBSD: head/sys/arm/arm/vm_machdep.c 288492 2015-10-02 13:25:59Z kib $"); 45 46#include <sys/param.h> 47#include <sys/systm.h> 48#include <sys/kernel.h> 49#include <sys/malloc.h> 50#include <sys/mbuf.h> 51#include <sys/proc.h> 52#include <sys/socketvar.h> 53#include <sys/syscall.h> 54#include <sys/sysctl.h> 55#include <sys/sysent.h> 56#include <sys/unistd.h> 57 58#include <machine/acle-compat.h> 59#include <machine/cpu.h> 60#include <machine/frame.h> 61#include <machine/pcb.h> 62#include <machine/sysarch.h> 63#include <sys/lock.h> 64#include <sys/mutex.h> 65 66#include <vm/vm.h> 67#include <vm/pmap.h> 68#include <vm/vm_extern.h> 69#include <vm/vm_kern.h> 70#include <vm/vm_page.h> 71#include <vm/vm_map.h> 72#include <vm/vm_param.h> 73#include <vm/vm_pageout.h> 74#include <vm/uma.h> 75#include <vm/uma_int.h> 76 77#include <machine/acle-compat.h> 78#include <machine/md_var.h> 79#include <machine/vfp.h> 80 81/* 82 * struct switchframe and trapframe must both be a multiple of 8 83 * for correct stack alignment. 84 */ 85CTASSERT(sizeof(struct switchframe) == 48); 86CTASSERT(sizeof(struct trapframe) == 80); 87 88/* 89 * Finish a fork operation, with process p2 nearly set up. 90 * Copy and update the pcb, set up the stack so that the child 91 * ready to run and return to user mode. 92 */ 93void 94cpu_fork(register struct thread *td1, register struct proc *p2, 95 struct thread *td2, int flags) 96{ 97 struct pcb *pcb2; 98 struct trapframe *tf; 99 struct mdproc *mdp2; 100 101 if ((flags & RFPROC) == 0) 102 return; 103 104 /* Point the pcb to the top of the stack */ 105 pcb2 = (struct pcb *) 106 (td2->td_kstack + td2->td_kstack_pages * PAGE_SIZE) - 1; 107#ifdef __XSCALE__ 108#ifndef CPU_XSCALE_CORE3 109 pmap_use_minicache(td2->td_kstack, td2->td_kstack_pages * PAGE_SIZE); 110#endif 111#endif 112 td2->td_pcb = pcb2; 113 114 /* Clone td1's pcb */ 115 bcopy(td1->td_pcb, pcb2, sizeof(*pcb2)); 116 117 /* Point to mdproc and then copy over td1's contents */ 118 mdp2 = &p2->p_md; 119 bcopy(&td1->td_proc->p_md, mdp2, sizeof(*mdp2)); 120 121 /* Point the frame to the stack in front of pcb and copy td1's frame */ 122 td2->td_frame = (struct trapframe *)pcb2 - 1; 123 *td2->td_frame = *td1->td_frame; 124 125 /* 126 * Create a new fresh stack for the new process. 127 * Copy the trap frame for the return to user mode as if from a 128 * syscall. This copies most of the user mode register values. 129 */ 130 pmap_set_pcb_pagedir(vmspace_pmap(p2->p_vmspace), pcb2); 131 pcb2->pcb_regs.sf_r4 = (register_t)fork_return; 132 pcb2->pcb_regs.sf_r5 = (register_t)td2; 133 pcb2->pcb_regs.sf_lr = (register_t)fork_trampoline; 134 pcb2->pcb_regs.sf_sp = STACKALIGN(td2->td_frame); 135 136 pcb2->pcb_vfpcpu = -1; 137 pcb2->pcb_vfpstate.fpscr = VFPSCR_DN; 138 139 tf = td2->td_frame; 140 tf->tf_spsr &= ~PSR_C; 141 tf->tf_r0 = 0; 142 tf->tf_r1 = 0; 143 144 145 /* Setup to release spin count in fork_exit(). */ 146 td2->td_md.md_spinlock_count = 1; 147 td2->td_md.md_saved_cspr = PSR_SVC32_MODE;; 148#if __ARM_ARCH >= 6 149 td2->td_md.md_tp = td1->td_md.md_tp; 150#else 151 td2->td_md.md_tp = *(register_t *)ARM_TP_ADDRESS; 152#endif 153} 154 155void 156cpu_thread_swapin(struct thread *td) 157{ 158} 159 160void 161cpu_thread_swapout(struct thread *td) 162{ 163} 164 165void 166cpu_set_syscall_retval(struct thread *td, int error) 167{ 168 struct trapframe *frame; 169 int fixup; 170#ifdef __ARMEB__ 171 u_int call; 172#endif 173 174 frame = td->td_frame; 175 fixup = 0; 176 177#ifdef __ARMEB__ 178 /* 179 * __syscall returns an off_t while most other syscalls return an 180 * int. As an off_t is 64-bits and an int is 32-bits we need to 181 * place the returned data into r1. As the lseek and frerebsd6_lseek 182 * syscalls also return an off_t they do not need this fixup. 183 */ 184 call = frame->tf_r7; 185 if (call == SYS___syscall) { 186 register_t *ap = &frame->tf_r0; 187 register_t code = ap[_QUAD_LOWWORD]; 188 if (td->td_proc->p_sysent->sv_mask) 189 code &= td->td_proc->p_sysent->sv_mask; 190 fixup = (code != SYS_freebsd6_lseek && code != SYS_lseek) 191 ? 1 : 0; 192 } 193#endif 194 195 switch (error) { 196 case 0: 197 if (fixup) { 198 frame->tf_r0 = 0; 199 frame->tf_r1 = td->td_retval[0]; 200 } else { 201 frame->tf_r0 = td->td_retval[0]; 202 frame->tf_r1 = td->td_retval[1]; 203 } 204 frame->tf_spsr &= ~PSR_C; /* carry bit */ 205 break; 206 case ERESTART: 207 /* 208 * Reconstruct the pc to point at the swi. 209 */ 210#if __ARM_ARCH >= 7 211 if ((frame->tf_spsr & PSR_T) != 0) 212 frame->tf_pc -= THUMB_INSN_SIZE; 213 else 214#endif 215 frame->tf_pc -= INSN_SIZE; 216 break; 217 case EJUSTRETURN: 218 /* nothing to do */ 219 break; 220 default: 221 frame->tf_r0 = error; 222 frame->tf_spsr |= PSR_C; /* carry bit */ 223 break; 224 } 225} 226 227/* 228 * Initialize machine state (pcb and trap frame) for a new thread about to 229 * upcall. Put enough state in the new thread's PCB to get it to go back 230 * userret(), where we can intercept it again to set the return (upcall) 231 * Address and stack, along with those from upcals that are from other sources 232 * such as those generated in thread_userret() itself. 233 */ 234void 235cpu_set_upcall(struct thread *td, struct thread *td0) 236{ 237 238 bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe)); 239 bcopy(td0->td_pcb, td->td_pcb, sizeof(struct pcb)); 240 241 td->td_pcb->pcb_regs.sf_r4 = (register_t)fork_return; 242 td->td_pcb->pcb_regs.sf_r5 = (register_t)td; 243 td->td_pcb->pcb_regs.sf_lr = (register_t)fork_trampoline; 244 td->td_pcb->pcb_regs.sf_sp = STACKALIGN(td->td_frame); 245 246 td->td_frame->tf_spsr &= ~PSR_C; 247 td->td_frame->tf_r0 = 0; 248 249 /* Setup to release spin count in fork_exit(). */ 250 td->td_md.md_spinlock_count = 1; 251 td->td_md.md_saved_cspr = PSR_SVC32_MODE; 252} 253 254/* 255 * Set that machine state for performing an upcall that has to 256 * be done in thread_userret() so that those upcalls generated 257 * in thread_userret() itself can be done as well. 258 */ 259void 260cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg, 261 stack_t *stack) 262{ 263 struct trapframe *tf = td->td_frame; 264 265 tf->tf_usr_sp = STACKALIGN((int)stack->ss_sp + stack->ss_size); 266 tf->tf_pc = (int)entry; 267 tf->tf_r0 = (int)arg; 268 tf->tf_spsr = PSR_USR32_MODE; 269} 270 271int 272cpu_set_user_tls(struct thread *td, void *tls_base) 273{ 274 275 td->td_md.md_tp = (register_t)tls_base; 276 if (td == curthread) { 277 critical_enter(); 278#if __ARM_ARCH >= 6 279 set_tls(tls_base); 280#else 281 *(register_t *)ARM_TP_ADDRESS = (register_t)tls_base; 282#endif 283 critical_exit(); 284 } 285 return (0); 286} 287 288void 289cpu_thread_exit(struct thread *td) 290{ 291} 292 293void 294cpu_thread_alloc(struct thread *td) 295{ 296 td->td_pcb = (struct pcb *)(td->td_kstack + td->td_kstack_pages * 297 PAGE_SIZE) - 1; 298 /* 299 * Ensure td_frame is aligned to an 8 byte boundary as it will be 300 * placed into the stack pointer which must be 8 byte aligned in 301 * the ARM EABI. 302 */ 303 td->td_frame = (struct trapframe *)((caddr_t)td->td_pcb) - 1; 304 305#ifdef __XSCALE__ 306#ifndef CPU_XSCALE_CORE3 307 pmap_use_minicache(td->td_kstack, td->td_kstack_pages * PAGE_SIZE); 308#endif 309#endif 310} 311 312void 313cpu_thread_free(struct thread *td) 314{ 315} 316 317void 318cpu_thread_clean(struct thread *td) 319{ 320} 321 322/* 323 * Intercept the return address from a freshly forked process that has NOT 324 * been scheduled yet. 325 * 326 * This is needed to make kernel threads stay in kernel mode. 327 */ 328void 329cpu_set_fork_handler(struct thread *td, void (*func)(void *), void *arg) 330{ 331 td->td_pcb->pcb_regs.sf_r4 = (register_t)func; /* function */ 332 td->td_pcb->pcb_regs.sf_r5 = (register_t)arg; /* first arg */ 333} 334 335/* 336 * Software interrupt handler for queued VM system processing. 337 */ 338void 339swi_vm(void *dummy) 340{ 341 342 if (busdma_swi_pending) 343 busdma_swi(); 344} 345 346void 347cpu_exit(struct thread *td) 348{ 349} 350 351