vm_machdep.c revision 109342
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 * $FreeBSD: head/sys/amd64/amd64/vm_machdep.c 109342 2003-01-16 00:02:21Z dillon $ 42 */ 43 44#include "opt_npx.h" 45#ifdef PC98 46#include "opt_pc98.h" 47#endif 48#include "opt_reset.h" 49#include "opt_isa.h" 50#include "opt_kstack_pages.h" 51 52#include <sys/param.h> 53#include <sys/systm.h> 54#include <sys/malloc.h> 55#include <sys/proc.h> 56#include <sys/kse.h> 57#include <sys/bio.h> 58#include <sys/buf.h> 59#include <sys/vnode.h> 60#include <sys/vmmeter.h> 61#include <sys/kernel.h> 62#include <sys/ktr.h> 63#include <sys/mutex.h> 64#include <sys/smp.h> 65#include <sys/sysctl.h> 66#include <sys/unistd.h> 67 68#include <machine/cpu.h> 69#include <machine/md_var.h> 70#include <machine/pcb.h> 71#include <machine/pcb_ext.h> 72#include <machine/vm86.h> 73 74#include <vm/vm.h> 75#include <vm/vm_param.h> 76#include <sys/lock.h> 77#include <vm/vm_kern.h> 78#include <vm/vm_page.h> 79#include <vm/vm_map.h> 80#include <vm/vm_extern.h> 81 82#include <sys/user.h> 83 84#ifdef PC98 85#include <pc98/pc98/pc98.h> 86#else 87#include <i386/isa/isa.h> 88#endif 89 90static void cpu_reset_real(void); 91#ifdef SMP 92static void cpu_reset_proxy(void); 93static u_int cpu_reset_proxyid; 94static volatile u_int cpu_reset_proxy_active; 95#endif 96extern int _ucodesel, _udatasel; 97 98/* 99 * Finish a fork operation, with process p2 nearly set up. 100 * Copy and update the pcb, set up the stack so that the child 101 * ready to run and return to user mode. 102 */ 103void 104cpu_fork(td1, p2, td2, flags) 105 register struct thread *td1; 106 register struct proc *p2; 107 struct thread *td2; 108 int flags; 109{ 110 register struct proc *p1; 111 struct pcb *pcb2; 112 struct mdproc *mdp2; 113#ifdef DEV_NPX 114 register_t savecrit; 115#endif 116 117 p1 = td1->td_proc; 118 if ((flags & RFPROC) == 0) { 119 if ((flags & RFMEM) == 0) { 120 /* unshare user LDT */ 121 struct mdproc *mdp1 = &p1->p_md; 122 struct proc_ldt *pldt = mdp1->md_ldt; 123 if (pldt && pldt->ldt_refcnt > 1) { 124 pldt = user_ldt_alloc(mdp1, pldt->ldt_len); 125 if (pldt == NULL) 126 panic("could not copy LDT"); 127 mdp1->md_ldt = pldt; 128 set_user_ldt(mdp1); 129 user_ldt_free(td1); 130 } 131 } 132 return; 133 } 134 135 /* Ensure that p1's pcb is up to date. */ 136#ifdef DEV_NPX 137 if (td1 == curthread) 138 td1->td_pcb->pcb_gs = rgs(); 139 savecrit = intr_disable(); 140 if (PCPU_GET(fpcurthread) == td1) 141 npxsave(&td1->td_pcb->pcb_save); 142 intr_restore(savecrit); 143#endif 144 145 /* Point the pcb to the top of the stack */ 146 pcb2 = (struct pcb *)(td2->td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 147 td2->td_pcb = pcb2; 148 149 /* Copy p1's pcb */ 150 bcopy(td1->td_pcb, pcb2, sizeof(*pcb2)); 151 152 /* Point mdproc and then copy over td1's contents */ 153 mdp2 = &p2->p_md; 154 bcopy(&p1->p_md, mdp2, sizeof(*mdp2)); 155 156 /* 157 * Create a new fresh stack for the new process. 158 * Copy the trap frame for the return to user mode as if from a 159 * syscall. This copies most of the user mode register values. 160 * The -16 is so we can expand the trapframe if we go to vm86. 161 */ 162 td2->td_frame = (struct trapframe *)((caddr_t)td2->td_pcb - 16) - 1; 163 bcopy(td1->td_frame, td2->td_frame, sizeof(struct trapframe)); 164 165 td2->td_frame->tf_eax = 0; /* Child returns zero */ 166 td2->td_frame->tf_eflags &= ~PSL_C; /* success */ 167 td2->td_frame->tf_edx = 1; 168 169 /* 170 * Set registers for trampoline to user mode. Leave space for the 171 * return address on stack. These are the kernel mode register values. 172 */ 173 pcb2->pcb_cr3 = vtophys(vmspace_pmap(p2->p_vmspace)->pm_pdir); 174 pcb2->pcb_edi = 0; 175 pcb2->pcb_esi = (int)fork_return; /* fork_trampoline argument */ 176 pcb2->pcb_ebp = 0; 177 pcb2->pcb_esp = (int)td2->td_frame - sizeof(void *); 178 pcb2->pcb_ebx = (int)td2; /* fork_trampoline argument */ 179 pcb2->pcb_eip = (int)fork_trampoline; 180 pcb2->pcb_psl = td2->td_frame->tf_eflags & ~PSL_I; /* ints disabled */ 181 /*- 182 * pcb2->pcb_dr*: cloned above. 183 * pcb2->pcb_savefpu: cloned above. 184 * pcb2->pcb_flags: cloned above. 185 * pcb2->pcb_onfault: cloned above (always NULL here?). 186 * pcb2->pcb_gs: cloned above. 187 * pcb2->pcb_ext: cleared below. 188 */ 189 190 /* 191 * XXX don't copy the i/o pages. this should probably be fixed. 192 */ 193 pcb2->pcb_ext = 0; 194 195 /* Copy the LDT, if necessary. */ 196 mtx_lock_spin(&sched_lock); 197 if (mdp2->md_ldt != 0) { 198 if (flags & RFMEM) { 199 mdp2->md_ldt->ldt_refcnt++; 200 } else { 201 mdp2->md_ldt = user_ldt_alloc(mdp2, 202 mdp2->md_ldt->ldt_len); 203 if (mdp2->md_ldt == NULL) 204 panic("could not copy LDT"); 205 } 206 } 207 mtx_unlock_spin(&sched_lock); 208 209 /* 210 * Now, cpu_switch() can schedule the new process. 211 * pcb_esp is loaded pointing to the cpu_switch() stack frame 212 * containing the return address when exiting cpu_switch. 213 * This will normally be to fork_trampoline(), which will have 214 * %ebx loaded with the new proc's pointer. fork_trampoline() 215 * will set up a stack to call fork_return(p, frame); to complete 216 * the return to user-mode. 217 */ 218} 219 220/* 221 * Intercept the return address from a freshly forked process that has NOT 222 * been scheduled yet. 223 * 224 * This is needed to make kernel threads stay in kernel mode. 225 */ 226void 227cpu_set_fork_handler(td, func, arg) 228 struct thread *td; 229 void (*func)(void *); 230 void *arg; 231{ 232 /* 233 * Note that the trap frame follows the args, so the function 234 * is really called like this: func(arg, frame); 235 */ 236 td->td_pcb->pcb_esi = (int) func; /* function */ 237 td->td_pcb->pcb_ebx = (int) arg; /* first arg */ 238} 239 240void 241cpu_exit(struct thread *td) 242{ 243 struct mdproc *mdp; 244 245 mdp = &td->td_proc->p_md; 246 if (mdp->md_ldt) 247 user_ldt_free(td); 248 reset_dbregs(); 249} 250 251void 252cpu_thread_exit(struct thread *td) 253{ 254 struct pcb *pcb = td->td_pcb; 255#ifdef DEV_NPX 256 npxexit(td); 257#endif 258 if (pcb->pcb_flags & PCB_DBREGS) { 259 /* 260 * disable all hardware breakpoints 261 */ 262 reset_dbregs(); 263 pcb->pcb_flags &= ~PCB_DBREGS; 264 } 265} 266 267void 268cpu_thread_clean(struct thread *td) 269{ 270 struct pcb *pcb; 271 272 pcb = td->td_pcb; 273 if (pcb->pcb_ext != 0) { 274 /* XXXKSE XXXSMP not SMP SAFE.. what locks do we have? */ 275 /* if (pcb->pcb_ext->ext_refcount-- == 1) ?? */ 276 /* 277 * XXX do we need to move the TSS off the allocated pages 278 * before freeing them? (not done here) 279 */ 280 mtx_lock(&Giant); 281 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ext, 282 ctob(IOPAGES + 1)); 283 mtx_unlock(&Giant); 284 pcb->pcb_ext = 0; 285 } 286} 287 288void 289cpu_sched_exit(td) 290 register struct thread *td; 291{ 292} 293 294void 295cpu_thread_setup(struct thread *td) 296{ 297 298 td->td_pcb = 299 (struct pcb *)(td->td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 300 td->td_frame = (struct trapframe *)((caddr_t)td->td_pcb - 16) - 1; 301} 302 303/* 304 * Initialize machine state (pcb and trap frame) for a new thread about to 305 * upcall. Pu t enough state in the new thread's PCB to get it to go back 306 * userret(), where we can intercept it again to set the return (upcall) 307 * Address and stack, along with those from upcals that are from other sources 308 * such as those generated in thread_userret() itself. 309 */ 310void 311cpu_set_upcall(struct thread *td, void *pcb) 312{ 313 struct pcb *pcb2; 314 315 td->td_flags |= TDF_UPCALLING; 316 317 /* Point the pcb to the top of the stack. */ 318 pcb2 = td->td_pcb; 319 320 /* 321 * Copy the upcall pcb. This loads kernel regs. 322 * Those not loaded individually below get their default 323 * values here. 324 * 325 * XXXKSE It might be a good idea to simply skip this as 326 * the values of the other registers may be unimportant. 327 * This would remove any requirement for knowing the KSE 328 * at this time (see the matching comment below for 329 * more analysis) (need a good safe default). 330 */ 331 bcopy(pcb, pcb2, sizeof(*pcb2)); 332 333 /* 334 * Create a new fresh stack for the new thread. 335 * The -16 is so we can expand the trapframe if we go to vm86. 336 * Don't forget to set this stack value into whatever supplies 337 * the address for the fault handlers. 338 * The contexts are filled in at the time we actually DO the 339 * upcall as only then do we know which KSE we got. 340 */ 341 td->td_frame = (struct trapframe *)((caddr_t)pcb2 - 16) - 1; 342 343 /* 344 * Set registers for trampoline to user mode. Leave space for the 345 * return address on stack. These are the kernel mode register values. 346 */ 347 pcb2->pcb_cr3 = vtophys(vmspace_pmap(td->td_proc->p_vmspace)->pm_pdir); 348 pcb2->pcb_edi = 0; 349 pcb2->pcb_esi = (int)fork_return; /* trampoline arg */ 350 pcb2->pcb_ebp = 0; 351 pcb2->pcb_esp = (int)td->td_frame - sizeof(void *); /* trampoline arg */ 352 pcb2->pcb_ebx = (int)td; /* trampoline arg */ 353 pcb2->pcb_eip = (int)fork_trampoline; 354 pcb2->pcb_psl &= ~(PSL_I); /* interrupts must be disabled */ 355 /* 356 * If we didn't copy the pcb, we'd need to do the following registers: 357 * pcb2->pcb_dr*: cloned above. 358 * pcb2->pcb_savefpu: cloned above. 359 * pcb2->pcb_flags: cloned above. 360 * pcb2->pcb_onfault: cloned above (always NULL here?). 361 * pcb2->pcb_gs: cloned above. XXXKSE ??? 362 * pcb2->pcb_ext: cleared below. 363 */ 364 pcb2->pcb_ext = NULL; 365} 366 367/* 368 * Set that machine state for performing an upcall that has to 369 * be done in thread_userret() so that those upcalls generated 370 * in thread_userret() itself can be done as well. 371 */ 372void 373cpu_set_upcall_kse(struct thread *td, struct kse *ke) 374{ 375 376 /* 377 * Do any extra cleaning that needs to be done. 378 * The thread may have optional components 379 * that are not present in a fresh thread. 380 * This may be a recycled thread so make it look 381 * as though it's newly allocated. 382 */ 383 cpu_thread_clean(td); 384 385 /* 386 * Set the trap frame to point at the beginning of the uts 387 * function. 388 */ 389 td->td_frame->tf_esp = 390 (int)ke->ke_stack.ss_sp + ke->ke_stack.ss_size - 16; 391 td->td_frame->tf_eip = (int)ke->ke_upcall; 392 393 /* 394 * Pass the address of the mailbox for this kse to the uts 395 * function as a parameter on the stack. 396 */ 397 suword((void *)(td->td_frame->tf_esp + sizeof(void *)), 398 (int)ke->ke_mailbox); 399} 400 401void 402cpu_wait(p) 403 struct proc *p; 404{ 405} 406 407/* 408 * Convert kernel VA to physical address 409 */ 410u_long 411kvtop(void *addr) 412{ 413 vm_offset_t va; 414 415 va = pmap_kextract((vm_offset_t)addr); 416 if (va == 0) 417 panic("kvtop: zero page frame"); 418 return((int)va); 419} 420 421/* 422 * Force reset the processor by invalidating the entire address space! 423 */ 424 425#ifdef SMP 426static void 427cpu_reset_proxy() 428{ 429 430 cpu_reset_proxy_active = 1; 431 while (cpu_reset_proxy_active == 1) 432 ; /* Wait for other cpu to see that we've started */ 433 stop_cpus((1<<cpu_reset_proxyid)); 434 printf("cpu_reset_proxy: Stopped CPU %d\n", cpu_reset_proxyid); 435 DELAY(1000000); 436 cpu_reset_real(); 437} 438#endif 439 440void 441cpu_reset() 442{ 443#ifdef SMP 444 if (smp_active == 0) { 445 cpu_reset_real(); 446 /* NOTREACHED */ 447 } else { 448 449 u_int map; 450 int cnt; 451 printf("cpu_reset called on cpu#%d\n", PCPU_GET(cpuid)); 452 453 map = PCPU_GET(other_cpus) & ~ stopped_cpus; 454 455 if (map != 0) { 456 printf("cpu_reset: Stopping other CPUs\n"); 457 stop_cpus(map); /* Stop all other CPUs */ 458 } 459 460 if (PCPU_GET(cpuid) == 0) { 461 DELAY(1000000); 462 cpu_reset_real(); 463 /* NOTREACHED */ 464 } else { 465 /* We are not BSP (CPU #0) */ 466 467 cpu_reset_proxyid = PCPU_GET(cpuid); 468 cpustop_restartfunc = cpu_reset_proxy; 469 cpu_reset_proxy_active = 0; 470 printf("cpu_reset: Restarting BSP\n"); 471 started_cpus = (1<<0); /* Restart CPU #0 */ 472 473 cnt = 0; 474 while (cpu_reset_proxy_active == 0 && cnt < 10000000) 475 cnt++; /* Wait for BSP to announce restart */ 476 if (cpu_reset_proxy_active == 0) 477 printf("cpu_reset: Failed to restart BSP\n"); 478 enable_intr(); 479 cpu_reset_proxy_active = 2; 480 481 while (1); 482 /* NOTREACHED */ 483 } 484 } 485#else 486 cpu_reset_real(); 487#endif 488} 489 490static void 491cpu_reset_real() 492{ 493 494#ifdef PC98 495 /* 496 * Attempt to do a CPU reset via CPU reset port. 497 */ 498 disable_intr(); 499 if ((inb(0x35) & 0xa0) != 0xa0) { 500 outb(0x37, 0x0f); /* SHUT0 = 0. */ 501 outb(0x37, 0x0b); /* SHUT1 = 0. */ 502 } 503 outb(0xf0, 0x00); /* Reset. */ 504#else 505 /* 506 * Attempt to do a CPU reset via the keyboard controller, 507 * do not turn of the GateA20, as any machine that fails 508 * to do the reset here would then end up in no man's land. 509 */ 510 511#if !defined(BROKEN_KEYBOARD_RESET) 512 outb(IO_KBD + 4, 0xFE); 513 DELAY(500000); /* wait 0.5 sec to see if that did it */ 514 printf("Keyboard reset did not work, attempting CPU shutdown\n"); 515 DELAY(1000000); /* wait 1 sec for printf to complete */ 516#endif 517#endif /* PC98 */ 518 /* force a shutdown by unmapping entire address space ! */ 519 bzero((caddr_t) PTD, PAGE_SIZE); 520 521 /* "good night, sweet prince .... <THUNK!>" */ 522 invltlb(); 523 /* NOTREACHED */ 524 while(1); 525} 526 527/* 528 * Software interrupt handler for queued VM system processing. 529 */ 530void 531swi_vm(void *dummy) 532{ 533 if (busdma_swi_pending != 0) 534 busdma_swi(); 535} 536 537/* 538 * Tell whether this address is in some physical memory region. 539 * Currently used by the kernel coredump code in order to avoid 540 * dumping the ``ISA memory hole'' which could cause indefinite hangs, 541 * or other unpredictable behaviour. 542 */ 543 544int 545is_physical_memory(addr) 546 vm_offset_t addr; 547{ 548 549#ifdef DEV_ISA 550 /* The ISA ``memory hole''. */ 551 if (addr >= 0xa0000 && addr < 0x100000) 552 return 0; 553#endif 554 555 /* 556 * stuff other tests for known memory-mapped devices (PCI?) 557 * here 558 */ 559 560 return 1; 561} 562