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1 /*-
2  * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org>
3  * Copyright (c) 2001-2012 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
4  * Copyright (c) 2003 Peter Wemm
5  * Copyright (c) 2008-2012 Jung-uk Kim <jkim@FreeBSD.org>
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/param.h>
34 #include <sys/bus.h>
35 #include <sys/eventhandler.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/memrange.h>
39 #include <sys/smp.h>
40
41 #include <vm/vm.h>
42 #include <vm/pmap.h>
43
44 #include <machine/clock.h>
45 #include <machine/intr_machdep.h>
46 #include <x86/mca.h>
47 #include <machine/pcb.h>
48 #include <machine/pmap.h>
49 #include <machine/specialreg.h>
50 #include <machine/md_var.h>
51
52 #ifdef SMP
53 #include <x86/apicreg.h>
54 #include <machine/smp.h>
55 #include <machine/vmparam.h>
56 #endif
57
58 #include <contrib/dev/acpica/include/acpi.h>
59
60 #include <dev/acpica/acpivar.h>
61
62 #include "acpi_wakecode.h"
63 #include "acpi_wakedata.h"
64
65 /* Make sure the code is less than a page and leave room for the stack. */
66 CTASSERT(sizeof(wakecode) < PAGE_SIZE - 1024);
67
68 extern int              acpi_resume_beep;
69 extern int              acpi_reset_video;
70
71 #ifdef SMP
72 extern struct pcb       **susppcbs;
73 static cpuset_t         suspcpus;
74 #else
75 static struct pcb       **susppcbs;
76 #endif
77
78 static void             *acpi_alloc_wakeup_handler(void);
79 static void             acpi_stop_beep(void *);
80
81 #ifdef SMP
82 static int              acpi_wakeup_ap(struct acpi_softc *, int);
83 static void             acpi_wakeup_cpus(struct acpi_softc *);
84 #endif
85
86 #ifdef __amd64__
87 #define ACPI_PAGETABLES 3
88 #else
89 #define ACPI_PAGETABLES 0
90 #endif
91
92 #define WAKECODE_VADDR(sc)                              \
93     ((sc)->acpi_wakeaddr + (ACPI_PAGETABLES * PAGE_SIZE))
94 #define WAKECODE_PADDR(sc)                              \
95     ((sc)->acpi_wakephys + (ACPI_PAGETABLES * PAGE_SIZE))
96 #define WAKECODE_FIXUP(offset, type, val)       do {    \
97         type    *addr;                                  \
98         addr = (type *)(WAKECODE_VADDR(sc) + offset);   \
99         *addr = val;                                    \
100 } while (0)
101
102 static void
103 acpi_stop_beep(void *arg)
104 {
105
106         if (acpi_resume_beep != 0)
107                 timer_spkr_release();
108 }
109
110 #ifdef SMP
111 static int
112 acpi_wakeup_ap(struct acpi_softc *sc, int cpu)
113 {
114         int             vector = (WAKECODE_PADDR(sc) >> 12) & 0xff;
115         int             apic_id = cpu_apic_ids[cpu];
116         int             ms;
117
118         WAKECODE_FIXUP(wakeup_pcb, struct pcb *, susppcbs[cpu]);
119         WAKECODE_FIXUP(wakeup_gdt, uint16_t, susppcbs[cpu]->pcb_gdt.rd_limit);
120         WAKECODE_FIXUP(wakeup_gdt + 2, uint64_t,
121             susppcbs[cpu]->pcb_gdt.rd_base);
122
123         ipi_startup(apic_id, vector);
124
125         /* Wait up to 5 seconds for it to resume. */
126         for (ms = 0; ms < 5000; ms++) {
127                 if (!CPU_ISSET(cpu, &suspended_cpus))
128                         return (1);     /* return SUCCESS */
129                 DELAY(1000);
130         }
131         return (0);             /* return FAILURE */
132 }
133
134 #define WARMBOOT_TARGET         0
135 #define WARMBOOT_OFF            (KERNBASE + 0x0467)
136 #define WARMBOOT_SEG            (KERNBASE + 0x0469)
137
138 #define CMOS_REG                (0x70)
139 #define CMOS_DATA               (0x71)
140 #define BIOS_RESET              (0x0f)
141 #define BIOS_WARM               (0x0a)
142
143 static void
144 acpi_wakeup_cpus(struct acpi_softc *sc)
145 {
146         uint32_t        mpbioswarmvec;
147         int             cpu;
148         u_char          mpbiosreason;
149
150         /* save the current value of the warm-start vector */
151         mpbioswarmvec = *((uint32_t *)WARMBOOT_OFF);
152         outb(CMOS_REG, BIOS_RESET);
153         mpbiosreason = inb(CMOS_DATA);
154
155         /* setup a vector to our boot code */
156         *((volatile u_short *)WARMBOOT_OFF) = WARMBOOT_TARGET;
157         *((volatile u_short *)WARMBOOT_SEG) = WAKECODE_PADDR(sc) >> 4;
158         outb(CMOS_REG, BIOS_RESET);
159         outb(CMOS_DATA, BIOS_WARM);     /* 'warm-start' */
160
161         /* Wake up each AP. */
162         for (cpu = 1; cpu < mp_ncpus; cpu++) {
163                 if (!CPU_ISSET(cpu, &suspcpus))
164                         continue;
165                 if (acpi_wakeup_ap(sc, cpu) == 0) {
166                         /* restore the warmstart vector */
167                         *(uint32_t *)WARMBOOT_OFF = mpbioswarmvec;
168                         panic("acpi_wakeup: failed to resume AP #%d (PHY #%d)",
169                             cpu, cpu_apic_ids[cpu]);
170                 }
171         }
172
173         /* restore the warmstart vector */
174         *(uint32_t *)WARMBOOT_OFF = mpbioswarmvec;
175
176         outb(CMOS_REG, BIOS_RESET);
177         outb(CMOS_DATA, mpbiosreason);
178 }
179 #endif
180
181 int
182 acpi_sleep_machdep(struct acpi_softc *sc, int state)
183 {
184         ACPI_STATUS     status;
185
186         if (sc->acpi_wakeaddr == 0ul)
187                 return (-1);    /* couldn't alloc wake memory */
188
189 #ifdef SMP
190         suspcpus = all_cpus;
191         CPU_CLR(PCPU_GET(cpuid), &suspcpus);
192 #endif
193
194         if (acpi_resume_beep != 0)
195                 timer_spkr_acquire();
196
197         AcpiSetFirmwareWakingVector(WAKECODE_PADDR(sc));
198
199         intr_suspend();
200
201         if (savectx(susppcbs[0])) {
202 #ifdef __amd64__
203                 ctx_fpusave(susppcbs[0]->pcb_fpususpend);
204 #endif
205 #ifdef SMP
206                 if (!CPU_EMPTY(&suspcpus) && suspend_cpus(suspcpus) == 0) {
207                         device_printf(sc->acpi_dev, "Failed to suspend APs\n");
208                         return (0);     /* couldn't sleep */
209                 }
210 #endif
211
212                 WAKECODE_FIXUP(resume_beep, uint8_t, (acpi_resume_beep != 0));
213                 WAKECODE_FIXUP(reset_video, uint8_t, (acpi_reset_video != 0));
214
215 #ifndef __amd64__
216                 WAKECODE_FIXUP(wakeup_cr4, register_t, susppcbs[0]->pcb_cr4);
217 #endif
218                 WAKECODE_FIXUP(wakeup_pcb, struct pcb *, susppcbs[0]);
219                 WAKECODE_FIXUP(wakeup_gdt, uint16_t,
220                     susppcbs[0]->pcb_gdt.rd_limit);
221                 WAKECODE_FIXUP(wakeup_gdt + 2, uint64_t,
222                     susppcbs[0]->pcb_gdt.rd_base);
223
224                 /* Call ACPICA to enter the desired sleep state */
225                 if (state == ACPI_STATE_S4 && sc->acpi_s4bios)
226                         status = AcpiEnterSleepStateS4bios();
227                 else
228                         status = AcpiEnterSleepState(state);
229                 if (ACPI_FAILURE(status)) {
230                         device_printf(sc->acpi_dev,
231                             "AcpiEnterSleepState failed - %s\n",
232                             AcpiFormatException(status));
233                         return (0);     /* couldn't sleep */
234                 }
235
236                 for (;;)
237                         ia32_pause();
238         }
239
240         return (1);     /* wakeup successfully */
241 }
242
243 int
244 acpi_wakeup_machdep(struct acpi_softc *sc, int state, int sleep_result,
245     int intr_enabled)
246 {
247
248         if (sleep_result == -1)
249                 return (sleep_result);
250
251         if (!intr_enabled) {
252                 /* Wakeup MD procedures in interrupt disabled context */
253                 if (sleep_result == 1) {
254                         pmap_init_pat();
255                         initializecpu();
256                         PCPU_SET(switchtime, 0);
257                         PCPU_SET(switchticks, ticks);
258 #ifdef SMP
259                         if (!CPU_EMPTY(&suspcpus))
260                                 acpi_wakeup_cpus(sc);
261 #endif
262                 }
263
264 #ifdef SMP
265                 if (!CPU_EMPTY(&suspcpus))
266                         restart_cpus(suspcpus);
267 #endif
268                 mca_resume();
269                 intr_resume(/*suspend_cancelled*/false);
270
271                 AcpiSetFirmwareWakingVector(0);
272         } else {
273                 /* Wakeup MD procedures in interrupt enabled context */
274                 if (sleep_result == 1 && mem_range_softc.mr_op != NULL &&
275                     mem_range_softc.mr_op->reinit != NULL)
276                         mem_range_softc.mr_op->reinit(&mem_range_softc);
277         }
278
279         return (sleep_result);
280 }
281
282 static void *
283 acpi_alloc_wakeup_handler(void)
284 {
285         void            *wakeaddr;
286         int             i;
287
288         /*
289          * Specify the region for our wakeup code.  We want it in the low 1 MB
290          * region, excluding real mode IVT (0-0x3ff), BDA (0x400-0x4ff), EBDA
291          * (less than 128KB, below 0xa0000, must be excluded by SMAP and DSDT),
292          * and ROM area (0xa0000 and above).  The temporary page tables must be
293          * page-aligned.
294          */
295         wakeaddr = contigmalloc((ACPI_PAGETABLES + 1) * PAGE_SIZE, M_DEVBUF,
296             M_WAITOK, 0x500, 0xa0000, PAGE_SIZE, 0ul);
297         if (wakeaddr == NULL) {
298                 printf("%s: can't alloc wake memory\n", __func__);
299                 return (NULL);
300         }
301         if (EVENTHANDLER_REGISTER(power_resume, acpi_stop_beep, NULL,
302             EVENTHANDLER_PRI_LAST) == NULL) {
303                 printf("%s: can't register event handler\n", __func__);
304                 contigfree(wakeaddr, (ACPI_PAGETABLES + 1) * PAGE_SIZE,
305                     M_DEVBUF);
306                 return (NULL);
307         }
308         susppcbs = malloc(mp_ncpus * sizeof(*susppcbs), M_DEVBUF, M_WAITOK);
309         for (i = 0; i < mp_ncpus; i++) {
310                 susppcbs[i] = malloc(sizeof(**susppcbs), M_DEVBUF, M_WAITOK);
311 #ifdef __amd64__
312                 susppcbs[i]->pcb_fpususpend = alloc_fpusave(M_WAITOK);
313 #endif
314         }
315
316         return (wakeaddr);
317 }
318
319 void
320 acpi_install_wakeup_handler(struct acpi_softc *sc)
321 {
322         static void     *wakeaddr = NULL;
323 #ifdef __amd64__
324         uint64_t        *pt4, *pt3, *pt2;
325         int             i;
326 #endif
327
328         if (wakeaddr != NULL)
329                 return;
330
331         wakeaddr = acpi_alloc_wakeup_handler();
332         if (wakeaddr == NULL)
333                 return;
334
335         sc->acpi_wakeaddr = (vm_offset_t)wakeaddr;
336         sc->acpi_wakephys = vtophys(wakeaddr);
337
338         bcopy(wakecode, (void *)WAKECODE_VADDR(sc), sizeof(wakecode));
339
340         /* Patch GDT base address, ljmp targets. */
341         WAKECODE_FIXUP((bootgdtdesc + 2), uint32_t,
342             WAKECODE_PADDR(sc) + bootgdt);
343         WAKECODE_FIXUP((wakeup_sw32 + 2), uint32_t,
344             WAKECODE_PADDR(sc) + wakeup_32);
345 #ifdef __amd64__
346         WAKECODE_FIXUP((wakeup_sw64 + 1), uint32_t,
347             WAKECODE_PADDR(sc) + wakeup_64);
348         WAKECODE_FIXUP(wakeup_pagetables, uint32_t, sc->acpi_wakephys);
349 #endif
350
351         /* Save pointers to some global data. */
352         WAKECODE_FIXUP(wakeup_ret, void *, resumectx);
353 #ifndef __amd64__
354 #ifdef PAE
355         WAKECODE_FIXUP(wakeup_cr3, register_t, vtophys(kernel_pmap->pm_pdpt));
356 #else
357         WAKECODE_FIXUP(wakeup_cr3, register_t, vtophys(kernel_pmap->pm_pdir));
358 #endif
359
360 #else
361         /* Build temporary page tables below realmode code. */
362         pt4 = wakeaddr;
363         pt3 = pt4 + (PAGE_SIZE) / sizeof(uint64_t);
364         pt2 = pt3 + (PAGE_SIZE) / sizeof(uint64_t);
365
366         /* Create the initial 1GB replicated page tables */
367         for (i = 0; i < 512; i++) {
368                 /*
369                  * Each slot of the level 4 pages points
370                  * to the same level 3 page
371                  */
372                 pt4[i] = (uint64_t)(sc->acpi_wakephys + PAGE_SIZE);
373                 pt4[i] |= PG_V | PG_RW | PG_U;
374
375                 /*
376                  * Each slot of the level 3 pages points
377                  * to the same level 2 page
378                  */
379                 pt3[i] = (uint64_t)(sc->acpi_wakephys + (2 * PAGE_SIZE));
380                 pt3[i] |= PG_V | PG_RW | PG_U;
381
382                 /* The level 2 page slots are mapped with 2MB pages for 1GB. */
383                 pt2[i] = i * (2 * 1024 * 1024);
384                 pt2[i] |= PG_V | PG_RW | PG_PS | PG_U;
385         }
386 #endif
387
388         if (bootverbose)
389                 device_printf(sc->acpi_dev, "wakeup code va %#jx pa %#jx\n",
390                     (uintmax_t)sc->acpi_wakeaddr, (uintmax_t)sc->acpi_wakephys);
391 }