vm_machdep.c revision 71785
1195630Ssam/*- 2195630Ssam * Copyright (c) 1982, 1986 The Regents of the University of California. 3195630Ssam * Copyright (c) 1989, 1990 William Jolitz 4195630Ssam * Copyright (c) 1994 John Dyson 5195630Ssam * All rights reserved. 6195630Ssam * 7195630Ssam * This code is derived from software contributed to Berkeley by 8195630Ssam * the Systems Programming Group of the University of Utah Computer 9195630Ssam * Science Department, and William Jolitz. 10195630Ssam * 11195630Ssam * Redistribution and use in source and binary forms, with or without 12195630Ssam * modification, are permitted provided that the following conditions 13195630Ssam * are met: 14195630Ssam * 1. Redistributions of source code must retain the above copyright 15195630Ssam * notice, this list of conditions and the following disclaimer. 16195630Ssam * 2. Redistributions in binary form must reproduce the above copyright 17195630Ssam * notice, this list of conditions and the following disclaimer in the 18195630Ssam * documentation and/or other materials provided with the distribution. 19195630Ssam * 3. All advertising materials mentioning features or use of this software 20195630Ssam * must display the following acknowledgement: 21195630Ssam * This product includes software developed by the University of 22195630Ssam * California, Berkeley and its contributors. 23195630Ssam * 4. Neither the name of the University nor the names of its contributors 24195630Ssam * may be used to endorse or promote products derived from this software 25195630Ssam * without specific prior written permission. 26195630Ssam * 27195630Ssam * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28195630Ssam * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29195630Ssam * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30195630Ssam * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31195630Ssam * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32195630Ssam * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33195630Ssam * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34195630Ssam * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35195630Ssam * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36195630Ssam * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37195630Ssam * SUCH DAMAGE. 38195630Ssam * 39195630Ssam * from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91 40195630Ssam * Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$ 41195630Ssam * $FreeBSD: head/sys/amd64/amd64/vm_machdep.c 71785 2001-01-29 09:38:39Z peter $ 42195630Ssam */ 43195630Ssam 44195630Ssam#include "opt_npx.h" 45195630Ssam#include "opt_user_ldt.h" 46195630Ssam#ifdef PC98 47195630Ssam#include "opt_pc98.h" 48195630Ssam#endif 49195630Ssam#include "opt_reset.h" 50195630Ssam#include "opt_isa.h" 51195630Ssam 52195630Ssam#include <sys/param.h> 53195630Ssam#include <sys/systm.h> 54195630Ssam#include <sys/malloc.h> 55195630Ssam#include <sys/proc.h> 56195630Ssam#include <sys/bio.h> 57195630Ssam#include <sys/buf.h> 58195630Ssam#include <sys/vnode.h> 59195630Ssam#include <sys/vmmeter.h> 60195630Ssam#include <sys/kernel.h> 61195630Ssam#include <sys/ktr.h> 62195630Ssam#include <sys/mutex.h> 63195630Ssam#include <sys/sysctl.h> 64195630Ssam#include <sys/unistd.h> 65195630Ssam 66195630Ssam#include <machine/cpu.h> 67195630Ssam#include <machine/md_var.h> 68195630Ssam#ifdef SMP 69195630Ssam#include <machine/smp.h> 70195630Ssam#endif 71195630Ssam#include <machine/pcb.h> 72195630Ssam#include <machine/pcb_ext.h> 73195630Ssam#include <machine/vm86.h> 74195630Ssam 75195630Ssam#include <vm/vm.h> 76195630Ssam#include <vm/vm_param.h> 77195630Ssam#include <sys/lock.h> 78195630Ssam#include <vm/vm_kern.h> 79195630Ssam#include <vm/vm_page.h> 80195630Ssam#include <vm/vm_map.h> 81195630Ssam#include <vm/vm_extern.h> 82195630Ssam 83195630Ssam#include <sys/user.h> 84195630Ssam 85195630Ssam#ifdef PC98 86195630Ssam#include <pc98/pc98/pc98.h> 87195630Ssam#else 88195630Ssam#include <i386/isa/isa.h> 89195630Ssam#endif 90195630Ssam 91195630Ssamstatic void cpu_reset_real __P((void)); 92195630Ssam#ifdef SMP 93195630Ssamstatic void cpu_reset_proxy __P((void)); 94195630Ssamstatic u_int cpu_reset_proxyid; 95195630Ssamstatic volatile u_int cpu_reset_proxy_active; 96195630Ssam#endif 97195630Ssamextern int _ucodesel, _udatasel; 98195630Ssam 99195630Ssam/* 100195630Ssam * quick version of vm_fault 101195630Ssam */ 102195630Ssamint 103195630Ssamvm_fault_quick(v, prot) 104195630Ssam caddr_t v; 105195630Ssam int prot; 106195630Ssam{ 107195630Ssam int r; 108195630Ssam 109195630Ssam if (prot & VM_PROT_WRITE) 110195630Ssam r = subyte(v, fubyte(v)); 111195630Ssam else 112195630Ssam r = fubyte(v); 113195630Ssam return(r); 114195630Ssam} 115195630Ssam 116195630Ssam/* 117195630Ssam * Finish a fork operation, with process p2 nearly set up. 118195630Ssam * Copy and update the pcb, set up the stack so that the child 119195630Ssam * ready to run and return to user mode. 120195630Ssam */ 121195630Ssamvoid 122195630Ssamcpu_fork(p1, p2, flags) 123195630Ssam register struct proc *p1, *p2; 124195630Ssam int flags; 125195630Ssam{ 126195630Ssam struct pcb *pcb2; 127195630Ssam 128195630Ssam if ((flags & RFPROC) == 0) { 129195630Ssam#ifdef USER_LDT 130195630Ssam if ((flags & RFMEM) == 0) { 131195630Ssam /* unshare user LDT */ 132195630Ssam struct pcb *pcb1 = &p1->p_addr->u_pcb; 133195630Ssam struct pcb_ldt *pcb_ldt = pcb1->pcb_ldt; 134195630Ssam if (pcb_ldt && pcb_ldt->ldt_refcnt > 1) { 135195630Ssam pcb_ldt = user_ldt_alloc(pcb1,pcb_ldt->ldt_len); 136195630Ssam user_ldt_free(pcb1); 137195630Ssam pcb1->pcb_ldt = pcb_ldt; 138195630Ssam set_user_ldt(pcb1); 139195630Ssam } 140195630Ssam } 141195630Ssam#endif 142195630Ssam return; 143195630Ssam } 144195630Ssam 145195630Ssam#ifdef DEV_NPX 146195630Ssam /* Ensure that p1's pcb is up to date. */ 147195630Ssam if (PCPU_GET(npxproc) == p1) 148195630Ssam npxsave(&p1->p_addr->u_pcb.pcb_savefpu); 149195630Ssam#endif 150195630Ssam 151195630Ssam /* Copy p1's pcb. */ 152195630Ssam p2->p_addr->u_pcb = p1->p_addr->u_pcb; 153195630Ssam pcb2 = &p2->p_addr->u_pcb; 154195630Ssam 155195630Ssam /* 156195630Ssam * Create a new fresh stack for the new process. 157195630Ssam * Copy the trap frame for the return to user mode as if from a 158195630Ssam * syscall. This copies the user mode register values. 159195630Ssam */ 160195630Ssam p2->p_md.md_regs = (struct trapframe *) 161195630Ssam ((int)p2->p_addr + UPAGES * PAGE_SIZE - 16) - 1; 162195630Ssam bcopy(p1->p_md.md_regs, p2->p_md.md_regs, sizeof(*p2->p_md.md_regs)); 163195630Ssam 164195630Ssam p2->p_md.md_regs->tf_eax = 0; /* Child returns zero */ 165195630Ssam p2->p_md.md_regs->tf_eflags &= ~PSL_C; /* success */ 166195630Ssam p2->p_md.md_regs->tf_edx = 1; 167195630Ssam 168195630Ssam /* 169195630Ssam * Set registers for trampoline to user mode. Leave space for the 170195630Ssam * return address on stack. These are the kernel mode register values. 171195630Ssam */ 172195630Ssam pcb2->pcb_cr3 = vtophys(vmspace_pmap(p2->p_vmspace)->pm_pdir); 173195630Ssam pcb2->pcb_edi = 0; 174195630Ssam pcb2->pcb_esi = (int)fork_return; /* fork_trampoline argument */ 175195630Ssam pcb2->pcb_ebp = 0; 176195630Ssam pcb2->pcb_esp = (int)p2->p_md.md_regs - sizeof(void *); 177195630Ssam pcb2->pcb_ebx = (int)p2; /* fork_trampoline argument */ 178195630Ssam pcb2->pcb_eip = (int)fork_trampoline; 179195630Ssam /* 180195630Ssam * pcb2->pcb_ldt: duplicated below, if necessary. 181195630Ssam * pcb2->pcb_savefpu: cloned above. 182195630Ssam * pcb2->pcb_flags: cloned above (always 0 here?). 183195630Ssam * pcb2->pcb_onfault: cloned above (always NULL here?). 184195630Ssam */ 185195630Ssam 186195630Ssam pcb2->pcb_schednest = 0; 187195630Ssam 188195630Ssam /* 189195630Ssam * XXX don't copy the i/o pages. this should probably be fixed. 190195630Ssam */ 191195630Ssam pcb2->pcb_ext = 0; 192195630Ssam 193195630Ssam#ifdef USER_LDT 194195630Ssam /* Copy the LDT, if necessary. */ 195195630Ssam if (pcb2->pcb_ldt != 0) { 196195630Ssam if (flags & RFMEM) { 197195630Ssam pcb2->pcb_ldt->ldt_refcnt++; 198195630Ssam } else { 199195630Ssam pcb2->pcb_ldt = user_ldt_alloc(pcb2, 200195630Ssam pcb2->pcb_ldt->ldt_len); 201195630Ssam } 202195630Ssam } 203195630Ssam#endif 204195630Ssam 205195630Ssam /* 206195630Ssam * Now, cpu_switch() can schedule the new process. 207195630Ssam * pcb_esp is loaded pointing to the cpu_switch() stack frame 208195630Ssam * containing the return address when exiting cpu_switch. 209195630Ssam * This will normally be to fork_trampoline(), which will have 210195630Ssam * %ebx loaded with the new proc's pointer. fork_trampoline() 211195630Ssam * will set up a stack to call fork_return(p, frame); to complete 212195630Ssam * the return to user-mode. 213195630Ssam */ 214195630Ssam} 215195630Ssam 216195630Ssam/* 217195630Ssam * Intercept the return address from a freshly forked process that has NOT 218195630Ssam * been scheduled yet. 219195630Ssam * 220195630Ssam * This is needed to make kernel threads stay in kernel mode. 221195630Ssam */ 222195630Ssamvoid 223195630Ssamcpu_set_fork_handler(p, func, arg) 224195630Ssam struct proc *p; 225195630Ssam void (*func) __P((void *)); 226195630Ssam void *arg; 227195630Ssam{ 228195630Ssam /* 229195630Ssam * Note that the trap frame follows the args, so the function 230195630Ssam * is really called like this: func(arg, frame); 231195630Ssam */ 232195630Ssam p->p_addr->u_pcb.pcb_esi = (int) func; /* function */ 233211397Sjoel p->p_addr->u_pcb.pcb_ebx = (int) arg; /* first arg */ 234195630Ssam} 235195630Ssam 236195630Ssamvoid 237195630Ssamcpu_exit(p) 238195630Ssam register struct proc *p; 239195630Ssam{ 240195630Ssam struct pcb *pcb = &p->p_addr->u_pcb; 241195630Ssam 242195630Ssam#ifdef DEV_NPX 243195630Ssam npxexit(p); 244195630Ssam#endif 245195630Ssam if (pcb->pcb_ext != 0) { 246195630Ssam /* 247195630Ssam * XXX do we need to move the TSS off the allocated pages 248195630Ssam * before freeing them? (not done here) 249195630Ssam */ 250195630Ssam kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ext, 251195630Ssam ctob(IOPAGES + 1)); 252195630Ssam pcb->pcb_ext = 0; 253195630Ssam } 254195630Ssam#ifdef USER_LDT 255195630Ssam user_ldt_free(pcb); 256195630Ssam#endif 257195630Ssam if (pcb->pcb_flags & PCB_DBREGS) { 258195630Ssam /* 259195630Ssam * disable all hardware breakpoints 260195630Ssam */ 261195630Ssam reset_dbregs(); 262195630Ssam pcb->pcb_flags &= ~PCB_DBREGS; 263195630Ssam } 264195630Ssam mtx_enter(&sched_lock, MTX_SPIN); 265195630Ssam mtx_exit(&Giant, MTX_DEF | MTX_NOSWITCH); 266195630Ssam mtx_assert(&Giant, MA_NOTOWNED); 267195630Ssam 268195630Ssam /* 269195630Ssam * We have to wait until after releasing all locks before 270195630Ssam * changing p_stat. If we block on a mutex then we will be 271195630Ssam * back at SRUN when we resume and our parent will never 272195630Ssam * harvest us. 273195630Ssam */ 274195630Ssam p->p_stat = SZOMB; 275195630Ssam 276195630Ssam mp_fixme("assumption: p_pptr won't change at this time"); 277195630Ssam wakeup(p->p_pptr); 278195630Ssam 279195630Ssam cnt.v_swtch++; 280195630Ssam cpu_throw(); 281195630Ssam panic("cpu_exit"); 282195630Ssam} 283232786Sgavin 284195630Ssamvoid 285195630Ssamcpu_wait(p) 286210933Sjoel struct proc *p; 287195630Ssam{ 288195630Ssam /* drop per-process resources */ 289195630Ssam pmap_dispose_proc(p); 290195630Ssam 291195630Ssam /* and clean-out the vmspace */ 292195630Ssam vmspace_free(p->p_vmspace); 293195630Ssam} 294195630Ssam 295195630Ssam/* 296195630Ssam * Dump the machine specific header information at the start of a core dump. 297195630Ssam */ 298195630Ssamint 299195630Ssamcpu_coredump(p, vp, cred) 300195630Ssam struct proc *p; 301195630Ssam struct vnode *vp; 302195630Ssam struct ucred *cred; 303195630Ssam{ 304195630Ssam int error; 305195630Ssam caddr_t tempuser; 306195630Ssam 307195630Ssam tempuser = malloc(ctob(UPAGES), M_TEMP, M_WAITOK | M_ZERO); 308195630Ssam if (!tempuser) 309195630Ssam return EINVAL; 310195630Ssam 311210676Sjoel bcopy(p->p_addr, tempuser, sizeof(struct user)); 312195630Ssam bcopy(p->p_md.md_regs, 313195630Ssam tempuser + ((caddr_t) p->p_md.md_regs - (caddr_t) p->p_addr), 314195630Ssam sizeof(struct trapframe)); 315195630Ssam 316195630Ssam error = vn_rdwr(UIO_WRITE, vp, (caddr_t) tempuser, 317195630Ssam ctob(UPAGES), 318195630Ssam (off_t)0, UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, 319195630Ssam cred, (int *)NULL, p); 320195630Ssam 321195630Ssam free(tempuser, M_TEMP); 322195630Ssam 323195630Ssam return error; 324195630Ssam} 325195630Ssam 326195630Ssam#ifdef notyet 327195630Ssamstatic void 328195630Ssamsetredzone(pte, vaddr) 329195630Ssam u_short *pte; 330195630Ssam caddr_t vaddr; 331195630Ssam{ 332195630Ssam/* eventually do this by setting up an expand-down stack segment 333195630Ssam for ss0: selector, allowing stack access down to top of u. 334195630Ssam this means though that protection violations need to be handled 335195630Ssam thru a double fault exception that must do an integral task 336195630Ssam switch to a known good context, within which a dump can be 337195630Ssam taken. a sensible scheme might be to save the initial context 338195630Ssam used by sched (that has physical memory mapped 1:1 at bottom) 339195630Ssam and take the dump while still in mapped mode */ 340195630Ssam} 341195630Ssam#endif 342195630Ssam 343195630Ssam/* 344195630Ssam * Convert kernel VA to physical address 345195630Ssam */ 346195630Ssamu_long 347195630Ssamkvtop(void *addr) 348195630Ssam{ 349195630Ssam vm_offset_t va; 350195630Ssam 351195630Ssam va = pmap_kextract((vm_offset_t)addr); 352195630Ssam if (va == 0) 353195630Ssam panic("kvtop: zero page frame"); 354195630Ssam return((int)va); 355195630Ssam} 356195630Ssam 357195630Ssam/* 358195630Ssam * Map an IO request into kernel virtual address space. 359195630Ssam * 360195630Ssam * All requests are (re)mapped into kernel VA space. 361195630Ssam * Notice that we use b_bufsize for the size of the buffer 362195630Ssam * to be mapped. b_bcount might be modified by the driver. 363195630Ssam */ 364195630Ssamvoid 365195630Ssamvmapbuf(bp) 366195630Ssam register struct buf *bp; 367195630Ssam{ 368195630Ssam register caddr_t addr, v, kva; 369235578Sgjb vm_offset_t pa; 370195630Ssam 371195630Ssam if ((bp->b_flags & B_PHYS) == 0) 372195630Ssam panic("vmapbuf"); 373195630Ssam 374195630Ssam for (v = bp->b_saveaddr, addr = (caddr_t)trunc_page((vm_offset_t)bp->b_data); 375195630Ssam addr < bp->b_data + bp->b_bufsize; 376195630Ssam addr += PAGE_SIZE, v += PAGE_SIZE) { 377195630Ssam /* 378195630Ssam * Do the vm_fault if needed; do the copy-on-write thing 379195630Ssam * when reading stuff off device into memory. 380195630Ssam */ 381195630Ssam vm_fault_quick(addr, 382195630Ssam (bp->b_iocmd == BIO_READ)?(VM_PROT_READ|VM_PROT_WRITE):VM_PROT_READ); 383195630Ssam pa = trunc_page(pmap_kextract((vm_offset_t) addr)); 384195630Ssam if (pa == 0) 385195630Ssam panic("vmapbuf: page not present"); 386195630Ssam vm_page_hold(PHYS_TO_VM_PAGE(pa)); 387195630Ssam pmap_kenter((vm_offset_t) v, pa); 388195630Ssam } 389195630Ssam 390195630Ssam kva = bp->b_saveaddr; 391195630Ssam bp->b_saveaddr = bp->b_data; 392195630Ssam bp->b_data = kva + (((vm_offset_t) bp->b_data) & PAGE_MASK); 393195630Ssam} 394195630Ssam 395195630Ssam/* 396195630Ssam * Free the io map PTEs associated with this IO operation. 397195630Ssam * We also invalidate the TLB entries and restore the original b_addr. 398195630Ssam */ 399195630Ssamvoid 400210676Sjoelvunmapbuf(bp) 401195630Ssam register struct buf *bp; 402195630Ssam{ 403195630Ssam register caddr_t addr; 404195630Ssam vm_offset_t pa; 405195630Ssam 406195630Ssam if ((bp->b_flags & B_PHYS) == 0) 407195630Ssam panic("vunmapbuf"); 408195630Ssam 409195630Ssam for (addr = (caddr_t)trunc_page((vm_offset_t)bp->b_data); 410195630Ssam addr < bp->b_data + bp->b_bufsize; 411195630Ssam addr += PAGE_SIZE) { 412195630Ssam pa = trunc_page(pmap_kextract((vm_offset_t) addr)); 413195630Ssam pmap_kremove((vm_offset_t) addr); 414195630Ssam vm_page_unhold(PHYS_TO_VM_PAGE(pa)); 415195630Ssam } 416195630Ssam 417195630Ssam bp->b_data = bp->b_saveaddr; 418195630Ssam} 419195630Ssam 420195630Ssam/* 421195630Ssam * Force reset the processor by invalidating the entire address space! 422195630Ssam */ 423195630Ssam 424195630Ssam#ifdef SMP 425195630Ssamstatic void 426195630Ssamcpu_reset_proxy() 427195630Ssam{ 428195630Ssam 429195630Ssam cpu_reset_proxy_active = 1; 430195630Ssam while (cpu_reset_proxy_active == 1) 431195630Ssam ; /* Wait for other cpu to see that we've started */ 432195630Ssam stop_cpus((1<<cpu_reset_proxyid)); 433195630Ssam printf("cpu_reset_proxy: Stopped CPU %d\n", cpu_reset_proxyid); 434195630Ssam DELAY(1000000); 435195630Ssam cpu_reset_real(); 436195630Ssam} 437195630Ssam#endif 438195630Ssam 439195630Ssamvoid 440195630Ssamcpu_reset() 441195630Ssam{ 442195630Ssam#ifdef SMP 443195630Ssam if (smp_active == 0) { 444195630Ssam cpu_reset_real(); 445195630Ssam /* NOTREACHED */ 446195630Ssam } else { 447195630Ssam 448195630Ssam u_int map; 449195630Ssam int cnt; 450235578Sgjb printf("cpu_reset called on cpu#%d\n", PCPU_GET(cpuid)); 451195630Ssam 452195630Ssam map = PCPU_GET(other_cpus) & ~ stopped_cpus; 453195630Ssam 454195630Ssam if (map != 0) { 455195630Ssam printf("cpu_reset: Stopping other CPUs\n"); 456195630Ssam stop_cpus(map); /* Stop all other CPUs */ 457195630Ssam } 458195630Ssam 459195630Ssam if (PCPU_GET(cpuid) == 0) { 460195630Ssam DELAY(1000000); 461195630Ssam cpu_reset_real(); 462195630Ssam /* NOTREACHED */ 463195630Ssam } else { 464195630Ssam /* We are not BSP (CPU #0) */ 465195630Ssam 466195630Ssam cpu_reset_proxyid = PCPU_GET(cpuid); 467195630Ssam cpustop_restartfunc = cpu_reset_proxy; 468195630Ssam cpu_reset_proxy_active = 0; 469195630Ssam printf("cpu_reset: Restarting BSP\n"); 470195630Ssam started_cpus = (1<<0); /* Restart CPU #0 */ 471195630Ssam 472195630Ssam cnt = 0; 473195630Ssam while (cpu_reset_proxy_active == 0 && cnt < 10000000) 474195630Ssam cnt++; /* Wait for BSP to announce restart */ 475195630Ssam if (cpu_reset_proxy_active == 0) 476195630Ssam printf("cpu_reset: Failed to restart BSP\n"); 477195630Ssam enable_intr(); 478195630Ssam cpu_reset_proxy_active = 2; 479195630Ssam 480195630Ssam while (1); 481195630Ssam /* NOTREACHED */ 482195630Ssam } 483195630Ssam } 484195630Ssam#else 485195630Ssam cpu_reset_real(); 486195630Ssam#endif 487195630Ssam} 488211397Sjoel 489195630Ssamstatic void 490195630Ssamcpu_reset_real() 491195630Ssam{ 492195630Ssam 493211397Sjoel#ifdef PC98 494195630Ssam /* 495195630Ssam * Attempt to do a CPU reset via CPU reset port. 496195630Ssam */ 497195630Ssam disable_intr(); 498195630Ssam if ((inb(0x35) & 0xa0) != 0xa0) { 499195630Ssam outb(0x37, 0x0f); /* SHUT0 = 0. */ 500195630Ssam outb(0x37, 0x0b); /* SHUT1 = 0. */ 501195630Ssam } 502195630Ssam outb(0xf0, 0x00); /* Reset. */ 503195630Ssam#else 504195630Ssam /* 505195630Ssam * Attempt to do a CPU reset via the keyboard controller, 506195630Ssam * do not turn of the GateA20, as any machine that fails 507195630Ssam * to do the reset here would then end up in no man's land. 508195630Ssam */ 509195630Ssam 510195630Ssam#if !defined(BROKEN_KEYBOARD_RESET) 511195630Ssam outb(IO_KBD + 4, 0xFE); 512195630Ssam DELAY(500000); /* wait 0.5 sec to see if that did it */ 513195630Ssam printf("Keyboard reset did not work, attempting CPU shutdown\n"); 514195630Ssam DELAY(1000000); /* wait 1 sec for printf to complete */ 515195630Ssam#endif 516195630Ssam#endif /* PC98 */ 517195630Ssam /* force a shutdown by unmapping entire address space ! */ 518195630Ssam bzero((caddr_t) PTD, PAGE_SIZE); 519195630Ssam 520195630Ssam /* "good night, sweet prince .... <THUNK!>" */ 521195630Ssam invltlb(); 522195630Ssam /* NOTREACHED */ 523195630Ssam while(1); 524195630Ssam} 525195630Ssam 526195630Ssamint 527195630Ssamgrow_stack(p, sp) 528195630Ssam struct proc *p; 529195630Ssam u_int sp; 530195630Ssam{ 531195630Ssam int rv; 532195630Ssam 533195630Ssam rv = vm_map_growstack (p, sp); 534195630Ssam if (rv != KERN_SUCCESS) 535195630Ssam return (0); 536195630Ssam 537195630Ssam return (1); 538195630Ssam} 539195630Ssam 540195630SsamSYSCTL_DECL(_vm_stats_misc); 541195630Ssam 542195630Ssamstatic int cnt_prezero; 543195630Ssam 544195630SsamSYSCTL_INT(_vm_stats_misc, OID_AUTO, 545195630Ssam cnt_prezero, CTLFLAG_RD, &cnt_prezero, 0, ""); 546195630Ssam 547195630Ssam/* 548195630Ssam * Implement the pre-zeroed page mechanism. 549195630Ssam * This routine is called from the idle loop. 550195630Ssam */ 551195630Ssam 552195630Ssam#define ZIDLE_LO(v) ((v) * 2 / 3) 553195630Ssam#define ZIDLE_HI(v) ((v) * 4 / 5) 554195630Ssam 555195630Ssamint 556195630Ssamvm_page_zero_idle() 557195630Ssam{ 558195630Ssam static int free_rover; 559195630Ssam static int zero_state; 560195630Ssam vm_page_t m; 561195630Ssam int s; 562195630Ssam 563195630Ssam /* 564195630Ssam * Attempt to maintain approximately 1/2 of our free pages in a 565195630Ssam * PG_ZERO'd state. Add some hysteresis to (attempt to) avoid 566195630Ssam * generally zeroing a page when the system is near steady-state. 567195630Ssam * Otherwise we might get 'flutter' during disk I/O / IPC or 568195630Ssam * fast sleeps. We also do not want to be continuously zeroing 569195630Ssam * pages because doing so may flush our L1 and L2 caches too much. 570195630Ssam */ 571195630Ssam 572195630Ssam if (zero_state && vm_page_zero_count >= ZIDLE_LO(cnt.v_free_count)) 573195630Ssam return(0); 574195630Ssam if (vm_page_zero_count >= ZIDLE_HI(cnt.v_free_count)) 575195630Ssam return(0); 576195630Ssam 577195630Ssam if (mtx_try_enter(&Giant, MTX_DEF)) { 578195630Ssam s = splvm(); 579195630Ssam zero_state = 0; 580195630Ssam m = vm_page_list_find(PQ_FREE, free_rover, FALSE); 581195630Ssam if (m != NULL && (m->flags & PG_ZERO) == 0) { 582195630Ssam vm_page_queues[m->queue].lcnt--; 583195630Ssam TAILQ_REMOVE(&vm_page_queues[m->queue].pl, m, pageq); 584195630Ssam m->queue = PQ_NONE; 585195630Ssam splx(s); 586195630Ssam pmap_zero_page(VM_PAGE_TO_PHYS(m)); 587195630Ssam (void)splvm(); 588195630Ssam vm_page_flag_set(m, PG_ZERO); 589195630Ssam m->queue = PQ_FREE + m->pc; 590195630Ssam vm_page_queues[m->queue].lcnt++; 591195630Ssam TAILQ_INSERT_TAIL(&vm_page_queues[m->queue].pl, m, 592195630Ssam pageq); 593195630Ssam ++vm_page_zero_count; 594195630Ssam ++cnt_prezero; 595195630Ssam if (vm_page_zero_count >= ZIDLE_HI(cnt.v_free_count)) 596195630Ssam zero_state = 1; 597195630Ssam } 598211397Sjoel free_rover = (free_rover + PQ_PRIME2) & PQ_L2_MASK; 599195630Ssam splx(s); 600195630Ssam mtx_exit(&Giant, MTX_DEF); 601195630Ssam return (1); 602195630Ssam } 603195630Ssam return (0); 604195630Ssam} 605195630Ssam 606195630Ssam/* 607195630Ssam * Software interrupt handler for queued VM system processing. 608195630Ssam */ 609195630Ssamvoid 610195630Ssamswi_vm(void *dummy) 611195630Ssam{ 612195630Ssam if (busdma_swi_pending != 0) 613195630Ssam busdma_swi(); 614195630Ssam} 615195630Ssam 616195630Ssam/* 617195630Ssam * Tell whether this address is in some physical memory region. 618195630Ssam * Currently used by the kernel coredump code in order to avoid 619195630Ssam * dumping the ``ISA memory hole'' which could cause indefinite hangs, 620195630Ssam * or other unpredictable behaviour. 621195630Ssam */ 622195630Ssam 623195630Ssamint 624195630Ssamis_physical_memory(addr) 625195630Ssam vm_offset_t addr; 626195630Ssam{ 627195630Ssam 628195630Ssam#ifdef DEV_ISA 629195630Ssam /* The ISA ``memory hole''. */ 630195630Ssam if (addr >= 0xa0000 && addr < 0x100000) 631195630Ssam return 0; 632195630Ssam#endif 633195630Ssam 634195630Ssam /* 635195630Ssam * stuff other tests for known memory-mapped devices (PCI?) 636195630Ssam * here 637195630Ssam */ 638195630Ssam 639195630Ssam return 1; 640195630Ssam} 641195630Ssam