AMD64 - Refactor uio_resid and size_t assumptions.
[dragonfly.git] / sys / platform / pc32 / i386 / vm_machdep.c
CommitLineData
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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: src/sys/i386/i386/vm_machdep.c,v 1.132.2.9 2003/01/25 19:02:23 dillon Exp $
21ce0dfa 42 * $DragonFly: src/sys/platform/pc32/i386/vm_machdep.c,v 1.61 2008/08/02 01:14:43 dillon Exp $
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43 */
44
1f2de5d4
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45#include "use_npx.h"
46#include "use_isa.h"
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47#include "opt_reset.h"
48
49#include <sys/param.h>
50#include <sys/systm.h>
51#include <sys/malloc.h>
52#include <sys/proc.h>
53#include <sys/buf.h>
ef0fdad1 54#include <sys/interrupt.h>
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55#include <sys/vnode.h>
56#include <sys/vmmeter.h>
57#include <sys/kernel.h>
58#include <sys/sysctl.h>
59#include <sys/unistd.h>
60
61#include <machine/clock.h>
62#include <machine/cpu.h>
63#include <machine/md_var.h>
984263bc 64#include <machine/smp.h>
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65#include <machine/pcb.h>
66#include <machine/pcb_ext.h>
67#include <machine/vm86.h>
4a22e893 68#include <machine/segments.h>
85100692 69#include <machine/globaldata.h> /* npxthread */
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70
71#include <vm/vm.h>
72#include <vm/vm_param.h>
73#include <sys/lock.h>
74#include <vm/vm_kern.h>
75#include <vm/vm_page.h>
76#include <vm/vm_map.h>
77#include <vm/vm_extern.h>
78
79#include <sys/user.h>
ae8050a4 80#include <sys/thread2.h>
984263bc 81
21ce0dfa 82#include <bus/isa/isa.h>
984263bc 83
3ae0cd58 84static void cpu_reset_real (void);
984263bc 85#ifdef SMP
3ae0cd58 86static void cpu_reset_proxy (void);
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87static u_int cpu_reset_proxyid;
88static volatile u_int cpu_reset_proxy_active;
89#endif
90extern int _ucodesel, _udatasel;
91
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92
93/*
bb3cd951 94 * Finish a fork operation, with lwp lp2 nearly set up.
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95 * Copy and update the pcb, set up the stack so that the child
96 * ready to run and return to user mode.
97 */
98void
bb3cd951 99cpu_fork(struct lwp *lp1, struct lwp *lp2, int flags)
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100{
101 struct pcb *pcb2;
102
103 if ((flags & RFPROC) == 0) {
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104 if ((flags & RFMEM) == 0) {
105 /* unshare user LDT */
bb3cd951 106 struct pcb *pcb1 = lp1->lwp_thread->td_pcb;
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107 struct pcb_ldt *pcb_ldt = pcb1->pcb_ldt;
108 if (pcb_ldt && pcb_ldt->ldt_refcnt > 1) {
109 pcb_ldt = user_ldt_alloc(pcb1,pcb_ldt->ldt_len);
110 user_ldt_free(pcb1);
111 pcb1->pcb_ldt = pcb_ldt;
112 set_user_ldt(pcb1);
113 }
114 }
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115 return;
116 }
117
118#if NNPX > 0
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119 /* Ensure that lp1's pcb is up to date. */
120 if (mdcpu->gd_npxthread == lp1->lwp_thread)
121 npxsave(lp1->lwp_thread->td_savefpu);
984263bc 122#endif
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123
124 /*
bb3cd951 125 * Copy lp1's PCB. This really only applies to the
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126 * debug registers and FP state, but its faster to just copy the
127 * whole thing. Because we only save the PCB at switchout time,
4e7c41c5 128 * the register state may not be current.
a96ef868 129 */
bb3cd951
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130 pcb2 = lp2->lwp_thread->td_pcb;
131 *pcb2 = *lp1->lwp_thread->td_pcb;
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132
133 /*
134 * Create a new fresh stack for the new process.
135 * Copy the trap frame for the return to user mode as if from a
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136 * syscall. This copies the user mode register values. The
137 * 16 byte offset saves space for vm86, and must match
138 * common_tss.esp0 (kernel stack pointer on entry from user mode)
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139 *
140 * pcb_esp must allocate an additional call-return pointer below
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141 * the trap frame which will be restored by cpu_restore from
142 * PCB_EIP, and the thread's td_sp pointer must allocate an
143 * additonal two worsd below the pcb_esp call-return pointer to
144 * hold the LWKT restore function pointer and eflags.
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145 *
146 * The LWKT restore function pointer must be set to cpu_restore,
147 * which is our standard heavy weight process switch-in function.
148 * YYY eventually we should shortcut fork_return and fork_trampoline
149 * to use the LWKT restore function directly so we can get rid of
150 * all the extra crap we are setting up.
984263bc 151 */
bb3cd951
SS
152 lp2->lwp_md.md_regs = (struct trapframe *)((char *)pcb2 - 16) - 1;
153 bcopy(lp1->lwp_md.md_regs, lp2->lwp_md.md_regs, sizeof(*lp2->lwp_md.md_regs));
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154
155 /*
156 * Set registers for trampoline to user mode. Leave space for the
157 * return address on stack. These are the kernel mode register values.
158 */
bb3cd951 159 pcb2->pcb_cr3 = vtophys(vmspace_pmap(lp2->lwp_proc->p_vmspace)->pm_pdir);
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160 pcb2->pcb_edi = 0;
161 pcb2->pcb_esi = (int)fork_return; /* fork_trampoline argument */
162 pcb2->pcb_ebp = 0;
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163 pcb2->pcb_esp = (int)lp2->lwp_md.md_regs - sizeof(void *);
164 pcb2->pcb_ebx = (int)lp2; /* fork_trampoline argument */
984263bc 165 pcb2->pcb_eip = (int)fork_trampoline;
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166 lp2->lwp_thread->td_sp = (char *)(pcb2->pcb_esp - sizeof(void *));
167 *(u_int32_t *)lp2->lwp_thread->td_sp = PSL_USER;
168 lp2->lwp_thread->td_sp -= sizeof(void *);
169 *(void **)lp2->lwp_thread->td_sp = (void *)cpu_heavy_restore;
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170
171 /*
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172 * pcb2->pcb_ldt: duplicated below, if necessary.
173 * pcb2->pcb_savefpu: cloned above.
174 * pcb2->pcb_flags: cloned above (always 0 here?).
175 * pcb2->pcb_onfault: cloned above (always NULL here?).
176 */
177
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178 /*
179 * XXX don't copy the i/o pages. this should probably be fixed.
180 */
181 pcb2->pcb_ext = 0;
182
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183 /* Copy the LDT, if necessary. */
184 if (pcb2->pcb_ldt != 0) {
185 if (flags & RFMEM) {
186 pcb2->pcb_ldt->ldt_refcnt++;
187 } else {
188 pcb2->pcb_ldt = user_ldt_alloc(pcb2,
189 pcb2->pcb_ldt->ldt_len);
190 }
191 }
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192 bcopy(&lp1->lwp_thread->td_tls, &lp2->lwp_thread->td_tls,
193 sizeof(lp2->lwp_thread->td_tls));
984263bc 194 /*
08f2f1bb 195 * Now, cpu_switch() can schedule the new lwp.
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196 * pcb_esp is loaded pointing to the cpu_switch() stack frame
197 * containing the return address when exiting cpu_switch.
198 * This will normally be to fork_trampoline(), which will have
08f2f1bb
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199 * %ebx loaded with the new lwp's pointer. fork_trampoline()
200 * will set up a stack to call fork_return(lp, frame); to complete
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201 * the return to user-mode.
202 */
203}
204
205/*
91bd9c1e
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206 * Prepare new lwp to return to the address specified in params.
207 */
208int
209cpu_prepare_lwp(struct lwp *lp, struct lwp_params *params)
210{
211 struct trapframe *regs = lp->lwp_md.md_regs;
212 void *bad_return = NULL;
213 int error;
214
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215 regs->tf_eip = (int)params->func;
216 regs->tf_esp = (int)params->stack;
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217 /* Set up argument for function call */
218 regs->tf_esp -= sizeof(params->arg);
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219 error =
220 copyout(&params->arg, (void *)regs->tf_esp, sizeof(params->arg));
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221 if (error)
222 return (error);
223 /*
224 * Set up fake return address. As the lwp function may never return,
225 * we simply copy out a NULL pointer and force the lwp to receive
226 * a SIGSEGV if it returns anyways.
227 */
228 regs->tf_esp -= sizeof(void *);
29adef62 229 error = copyout(&bad_return, (void *)regs->tf_esp, sizeof(bad_return));
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230 if (error)
231 return (error);
232
233 cpu_set_fork_handler(lp,
234 (void (*)(void *, struct trapframe *))generic_lwp_return, lp);
235 return (0);
236}
237
238/*
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239 * Intercept the return address from a freshly forked process that has NOT
240 * been scheduled yet.
241 *
242 * This is needed to make kernel threads stay in kernel mode.
243 */
244void
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245cpu_set_fork_handler(struct lwp *lp, void (*func)(void *, struct trapframe *),
246 void *arg)
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247{
248 /*
249 * Note that the trap frame follows the args, so the function
250 * is really called like this: func(arg, frame);
251 */
bb3cd951
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252 lp->lwp_thread->td_pcb->pcb_esi = (int) func; /* function */
253 lp->lwp_thread->td_pcb->pcb_ebx = (int) arg; /* first arg */
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254}
255
256void
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257cpu_set_thread_handler(thread_t td, void (*rfunc)(void), void *func, void *arg)
258{
259 td->td_pcb->pcb_esi = (int)func;
260 td->td_pcb->pcb_ebx = (int) arg;
261 td->td_switch = cpu_lwkt_switch;
262 td->td_sp -= sizeof(void *);
263 *(void **)td->td_sp = rfunc; /* exit function on return */
264 td->td_sp -= sizeof(void *);
265 *(void **)td->td_sp = cpu_kthread_restore;
266}
267
268void
c6880072 269cpu_lwp_exit(void)
984263bc 270{
99df837e 271 struct thread *td = curthread;
ae8050a4 272 struct pcb *pcb;
df011816 273 struct pcb_ext *ext;
99df837e 274
984263bc 275#if NNPX > 0
bb3cd951 276 npxexit();
984263bc 277#endif /* NNPX */
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278
279 /*
df011816
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280 * If we were using a private TSS do a forced-switch to ourselves
281 * to switch back to the common TSS before freeing it.
ae8050a4 282 */
99df837e 283 pcb = td->td_pcb;
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284 if ((ext = pcb->pcb_ext) != NULL) {
285 crit_enter();
286 pcb->pcb_ext = NULL;
287 td->td_switch(td);
288 crit_exit();
e4846942 289 kmem_free(&kernel_map, (vm_offset_t)ext, ctob(IOPAGES + 1));
984263bc 290 }
984263bc 291 user_ldt_free(pcb);
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292 if (pcb->pcb_flags & PCB_DBREGS) {
293 /*
294 * disable all hardware breakpoints
295 */
296 reset_dbregs();
297 pcb->pcb_flags &= ~PCB_DBREGS;
298 }
37af14fe 299 td->td_gd->gd_cnt.v_swtch++;
ae8050a4 300
37af14fe 301 crit_enter_quick(td);
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302 if (td->td_flags & TDF_TSLEEPQ)
303 tsleep_remove(td);
37af14fe 304 lwkt_deschedule_self(td);
e56e4dea 305 lwkt_remove_tdallq(td);
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306 cpu_thread_exit();
307}
308
309/*
310 * Terminate the current thread. The caller must have already acquired
311 * the thread's rwlock and placed it on a reap list or otherwise notified
312 * a reaper of its existance. We set a special assembly switch function which
313 * releases td_rwlock after it has cleaned up the MMU state and switched
314 * out the stack.
315 *
316 * Must be caller from a critical section and with the thread descheduled.
317 */
318void
319cpu_thread_exit(void)
320{
321 curthread->td_switch = cpu_exit_switch;
c1102e9f 322 curthread->td_flags |= TDF_EXITING;
8ad65e08 323 lwkt_switch();
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324 panic("cpu_exit");
325}
326
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327/*
328 * Process Reaper. Called after the caller has acquired the thread's
329 * rwlock and removed it from the reap list.
330 */
984263bc 331void
99df837e 332cpu_proc_wait(struct proc *p)
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333{
334 /* drop per-process resources */
c6880072 335 pmap_dispose_proc(p);
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336}
337
338#ifdef notyet
339static void
f123d5a1 340setredzone(u_short *pte, caddr_t vaddr)
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341{
342/* eventually do this by setting up an expand-down stack segment
343 for ss0: selector, allowing stack access down to top of u.
344 this means though that protection violations need to be handled
345 thru a double fault exception that must do an integral task
346 switch to a known good context, within which a dump can be
347 taken. a sensible scheme might be to save the initial context
348 used by sched (that has physical memory mapped 1:1 at bottom)
349 and take the dump while still in mapped mode */
350}
351#endif
352
353/*
354 * Convert kernel VA to physical address
355 */
6ef943a3 356vm_paddr_t
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357kvtop(void *addr)
358{
6ef943a3 359 vm_paddr_t pa;
984263bc 360
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361 pa = pmap_kextract((vm_offset_t)addr);
362 if (pa == 0)
984263bc 363 panic("kvtop: zero page frame");
6ef943a3 364 return (pa);
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365}
366
367/*
368 * Force reset the processor by invalidating the entire address space!
369 */
370
371#ifdef SMP
372static void
f123d5a1 373cpu_reset_proxy(void)
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374{
375 u_int saved_mp_lock;
376
377 cpu_reset_proxy_active = 1;
378 while (cpu_reset_proxy_active == 1)
379 ; /* Wait for other cpu to disable interupts */
380 saved_mp_lock = mp_lock;
96728c05 381 mp_lock = 0; /* BSP */
26be20a0 382 kprintf("cpu_reset_proxy: Grabbed mp lock for BSP\n");
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383 cpu_reset_proxy_active = 3;
384 while (cpu_reset_proxy_active == 3)
385 ; /* Wait for other cpu to enable interrupts */
386 stop_cpus((1<<cpu_reset_proxyid));
26be20a0 387 kprintf("cpu_reset_proxy: Stopped CPU %d\n", cpu_reset_proxyid);
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388 DELAY(1000000);
389 cpu_reset_real();
390}
391#endif
392
393void
f123d5a1 394cpu_reset(void)
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395{
396#ifdef SMP
0f7a3396 397 if (smp_active_mask == 1) {
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398 cpu_reset_real();
399 /* NOTREACHED */
400 } else {
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401 u_int map;
402 int cnt;
26be20a0 403 kprintf("cpu_reset called on cpu#%d\n",mycpu->gd_cpuid);
984263bc 404
0f7a3396 405 map = mycpu->gd_other_cpus & ~stopped_cpus & smp_active_mask;
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406
407 if (map != 0) {
26be20a0 408 kprintf("cpu_reset: Stopping other CPUs\n");
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409 stop_cpus(map); /* Stop all other CPUs */
410 }
411
72740893 412 if (mycpu->gd_cpuid == 0) {
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413 DELAY(1000000);
414 cpu_reset_real();
415 /* NOTREACHED */
416 } else {
417 /* We are not BSP (CPU #0) */
418
72740893 419 cpu_reset_proxyid = mycpu->gd_cpuid;
984263bc 420 cpustop_restartfunc = cpu_reset_proxy;
26be20a0 421 kprintf("cpu_reset: Restarting BSP\n");
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422 started_cpus = (1<<0); /* Restart CPU #0 */
423
424 cnt = 0;
425 while (cpu_reset_proxy_active == 0 && cnt < 10000000)
426 cnt++; /* Wait for BSP to announce restart */
427 if (cpu_reset_proxy_active == 0)
26be20a0 428 kprintf("cpu_reset: Failed to restart BSP\n");
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429 __asm __volatile("cli" : : : "memory");
430 cpu_reset_proxy_active = 2;
431 cnt = 0;
432 while (cpu_reset_proxy_active == 2 && cnt < 10000000)
433 cnt++; /* Do nothing */
434 if (cpu_reset_proxy_active == 2) {
26be20a0 435 kprintf("cpu_reset: BSP did not grab mp lock\n");
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436 cpu_reset_real(); /* XXX: Bogus ? */
437 }
438 cpu_reset_proxy_active = 4;
439 __asm __volatile("sti" : : : "memory");
440 while (1);
441 /* NOTREACHED */
442 }
443 }
444#else
445 cpu_reset_real();
446#endif
447}
448
449static void
f123d5a1 450cpu_reset_real(void)
984263bc 451{
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452 /*
453 * Attempt to do a CPU reset via the keyboard controller,
454 * do not turn of the GateA20, as any machine that fails
455 * to do the reset here would then end up in no man's land.
456 */
457
458#if !defined(BROKEN_KEYBOARD_RESET)
459 outb(IO_KBD + 4, 0xFE);
460 DELAY(500000); /* wait 0.5 sec to see if that did it */
26be20a0
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461 kprintf("Keyboard reset did not work, attempting CPU shutdown\n");
462 DELAY(1000000); /* wait 1 sec for kprintf to complete */
984263bc 463#endif
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464 /* force a shutdown by unmapping entire address space ! */
465 bzero((caddr_t) PTD, PAGE_SIZE);
466
467 /* "good night, sweet prince .... <THUNK!>" */
0f7a3396 468 cpu_invltlb();
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469 /* NOTREACHED */
470 while(1);
471}
472
473int
e54488bb 474grow_stack(struct proc *p, vm_offset_t sp)
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475{
476 int rv;
477
478 rv = vm_map_growstack (p, sp);
479 if (rv != KERN_SUCCESS)
480 return (0);
481
482 return (1);
483}
484
485SYSCTL_DECL(_vm_stats_misc);
486
487static int cnt_prezero;
488
489SYSCTL_INT(_vm_stats_misc, OID_AUTO,
490 cnt_prezero, CTLFLAG_RD, &cnt_prezero, 0, "");
491
26a0694b 492static void
477d3c1c 493swi_vm(void *arg, void *frame)
ef0fdad1 494{
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495 if (busdma_swi_pending != 0)
496 busdma_swi();
497}
498
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499static void
500swi_vm_setup(void *arg)
501{
477d3c1c 502 register_swi(SWI_VM, swi_vm, NULL, "swi_vm", NULL);
ef0fdad1
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503}
504
ba39e2e0 505SYSINIT(vm_setup, SI_BOOT2_MACHDEP, SI_ORDER_ANY, swi_vm_setup, NULL);
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506
507
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508/*
509 * Tell whether this address is in some physical memory region.
510 * Currently used by the kernel coredump code in order to avoid
511 * dumping the ``ISA memory hole'' which could cause indefinite hangs,
512 * or other unpredictable behaviour.
513 */
514
984263bc 515int
f123d5a1 516is_physical_memory(vm_offset_t addr)
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517{
518
519#if NISA > 0
520 /* The ISA ``memory hole''. */
521 if (addr >= 0xa0000 && addr < 0x100000)
522 return 0;
523#endif
524
525 /*
526 * stuff other tests for known memory-mapped devices (PCI?)
527 * here
528 */
529
530 return 1;
531}
135d7199
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532
533/*
534 * platform-specific vmspace initialization (nothing for i386)
535 */
536void
537cpu_vmspace_alloc(struct vmspace *vm __unused)
538{
539}
540
541void
542cpu_vmspace_free(struct vmspace *vm __unused)
543{
544}
460426e6
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545
546/*
547 * Used by /dev/kmem to determine if we can safely read or write
548 * the requested KVA range.
549 */
550int
551kvm_access_check(vm_offset_t saddr, vm_offset_t eaddr, int prot)
552{
553 vm_offset_t addr;
554
555 if (saddr < KvaStart)
556 return EFAULT;
557 if (eaddr >= KvaEnd)
558 return EFAULT;
559 for (addr = saddr; addr < eaddr; addr += PAGE_SIZE) {
560 if (pmap_extract(&kernel_pmap, addr) == 0)
561 return EFAULT;
562 }
563 if (!kernacc((caddr_t)saddr, eaddr - saddr, prot))
564 return EFAULT;
565 return 0;
566}
567