Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/acpica/acpi_wakeup.c
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1 /*- 2 * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org> 3 * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> 4 * Copyright (c) 2003 Peter Wemm 5 * Copyright (c) 2008-2010 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: releng/8.4/sys/amd64/acpica/acpi_wakeup.c 237009 2012-06-13 15:25:52Z jhb $"); 32 33 #include <sys/param.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/malloc.h> 37 #include <sys/memrange.h> 38 #include <sys/smp.h> 39 40 #include <vm/vm.h> 41 #include <vm/pmap.h> 42 43 #include <machine/intr_machdep.h> 44 #include <machine/mca.h> 45 #include <machine/pcb.h> 46 #include <machine/pmap.h> 47 #include <machine/specialreg.h> 48 #include <machine/md_var.h> 49 50 #ifdef SMP 51 #include <machine/apicreg.h> 52 #include <machine/smp.h> 53 #include <machine/vmparam.h> 54 #endif 55 56 #include <contrib/dev/acpica/include/acpi.h> 57 58 #include <dev/acpica/acpivar.h> 59 60 #include "acpi_wakecode.h" 61 #include "acpi_wakedata.h" 62 63 /* Make sure the code is less than a page and leave room for the stack. */ 64 CTASSERT(sizeof(wakecode) < PAGE_SIZE - 1024); 65 66 extern int acpi_resume_beep; 67 extern int acpi_reset_video; 68 69 #ifdef SMP 70 extern struct pcb **susppcbs; 71 extern void **suspfpusave; 72 #else 73 static struct pcb **susppcbs; 74 static void **suspfpusave; 75 #endif 76 77 int acpi_restorecpu(vm_offset_t, struct pcb *); 78 79 static void *acpi_alloc_wakeup_handler(void); 80 static void acpi_stop_beep(void *); 81 82 #ifdef SMP 83 static int acpi_wakeup_ap(struct acpi_softc *, int); 84 static void acpi_wakeup_cpus(struct acpi_softc *, cpumask_t); 85 #endif 86 87 #define WAKECODE_VADDR(sc) ((sc)->acpi_wakeaddr + (3 * PAGE_SIZE)) 88 #define WAKECODE_PADDR(sc) ((sc)->acpi_wakephys + (3 * PAGE_SIZE)) 89 #define WAKECODE_FIXUP(offset, type, val) do { \ 90 type *addr; \ 91 addr = (type *)(WAKECODE_VADDR(sc) + offset); \ 92 *addr = val; \ 93 } while (0) 94 95 /* Turn off bits 1&2 of the PIT, stopping the beep. */ 96 static void 97 acpi_stop_beep(void *arg) 98 { 99 outb(0x61, inb(0x61) & ~0x3); 100 } 101 102 #ifdef SMP 103 static int 104 acpi_wakeup_ap(struct acpi_softc *sc, int cpu) 105 { 106 int vector = (WAKECODE_PADDR(sc) >> 12) & 0xff; 107 int apic_id = cpu_apic_ids[cpu]; 108 int ms; 109 110 WAKECODE_FIXUP(wakeup_pcb, struct pcb *, susppcbs[cpu]); 111 WAKECODE_FIXUP(wakeup_fpusave, void *, suspfpusave[cpu]); 112 WAKECODE_FIXUP(wakeup_gdt, uint16_t, susppcbs[cpu]->pcb_gdt.rd_limit); 113 WAKECODE_FIXUP(wakeup_gdt + 2, uint64_t, 114 susppcbs[cpu]->pcb_gdt.rd_base); 115 WAKECODE_FIXUP(wakeup_cpu, int, cpu); 116 117 /* do an INIT IPI: assert RESET */ 118 lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_EDGE | 119 APIC_LEVEL_ASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_INIT, apic_id); 120 121 /* wait for pending status end */ 122 lapic_ipi_wait(-1); 123 124 /* do an INIT IPI: deassert RESET */ 125 lapic_ipi_raw(APIC_DEST_ALLESELF | APIC_TRIGMOD_LEVEL | 126 APIC_LEVEL_DEASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_INIT, 0); 127 128 /* wait for pending status end */ 129 DELAY(10000); /* wait ~10mS */ 130 lapic_ipi_wait(-1); 131 132 /* 133 * next we do a STARTUP IPI: the previous INIT IPI might still be 134 * latched, (P5 bug) this 1st STARTUP would then terminate 135 * immediately, and the previously started INIT IPI would continue. OR 136 * the previous INIT IPI has already run. and this STARTUP IPI will 137 * run. OR the previous INIT IPI was ignored. and this STARTUP IPI 138 * will run. 139 */ 140 141 /* do a STARTUP IPI */ 142 lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_EDGE | 143 APIC_LEVEL_DEASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_STARTUP | 144 vector, apic_id); 145 lapic_ipi_wait(-1); 146 DELAY(200); /* wait ~200uS */ 147 148 /* 149 * finally we do a 2nd STARTUP IPI: this 2nd STARTUP IPI should run IF 150 * the previous STARTUP IPI was cancelled by a latched INIT IPI. OR 151 * this STARTUP IPI will be ignored, as only ONE STARTUP IPI is 152 * recognized after hardware RESET or INIT IPI. 153 */ 154 155 lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_EDGE | 156 APIC_LEVEL_DEASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_STARTUP | 157 vector, apic_id); 158 lapic_ipi_wait(-1); 159 DELAY(200); /* wait ~200uS */ 160 161 /* Wait up to 5 seconds for it to start. */ 162 for (ms = 0; ms < 5000; ms++) { 163 if (*(int *)(WAKECODE_VADDR(sc) + wakeup_cpu) == 0) 164 return (1); /* return SUCCESS */ 165 DELAY(1000); 166 } 167 return (0); /* return FAILURE */ 168 } 169 170 #define WARMBOOT_TARGET 0 171 #define WARMBOOT_OFF (KERNBASE + 0x0467) 172 #define WARMBOOT_SEG (KERNBASE + 0x0469) 173 174 #define CMOS_REG (0x70) 175 #define CMOS_DATA (0x71) 176 #define BIOS_RESET (0x0f) 177 #define BIOS_WARM (0x0a) 178 179 static void 180 acpi_wakeup_cpus(struct acpi_softc *sc, cpumask_t wakeup_cpus) 181 { 182 uint32_t mpbioswarmvec; 183 int cpu; 184 u_char mpbiosreason; 185 186 /* save the current value of the warm-start vector */ 187 mpbioswarmvec = *((uint32_t *)WARMBOOT_OFF); 188 outb(CMOS_REG, BIOS_RESET); 189 mpbiosreason = inb(CMOS_DATA); 190 191 /* setup a vector to our boot code */ 192 *((volatile u_short *)WARMBOOT_OFF) = WARMBOOT_TARGET; 193 *((volatile u_short *)WARMBOOT_SEG) = WAKECODE_PADDR(sc) >> 4; 194 outb(CMOS_REG, BIOS_RESET); 195 outb(CMOS_DATA, BIOS_WARM); /* 'warm-start' */ 196 197 /* Wake up each AP. */ 198 for (cpu = 1; cpu < mp_ncpus; cpu++) { 199 if ((wakeup_cpus & (1 << cpu)) == 0) 200 continue; 201 if (acpi_wakeup_ap(sc, cpu) == 0) { 202 /* restore the warmstart vector */ 203 *(uint32_t *)WARMBOOT_OFF = mpbioswarmvec; 204 panic("acpi_wakeup: failed to resume AP #%d (PHY #%d)", 205 cpu, cpu_apic_ids[cpu]); 206 } 207 } 208 209 /* restore the warmstart vector */ 210 *(uint32_t *)WARMBOOT_OFF = mpbioswarmvec; 211 212 outb(CMOS_REG, BIOS_RESET); 213 outb(CMOS_DATA, mpbiosreason); 214 } 215 #endif 216 217 int 218 acpi_sleep_machdep(struct acpi_softc *sc, int state) 219 { 220 #ifdef SMP 221 cpumask_t wakeup_cpus; 222 #endif 223 register_t cr3, rf; 224 ACPI_STATUS status; 225 int ret; 226 227 ret = -1; 228 229 if (sc->acpi_wakeaddr == 0ul) 230 return (ret); 231 232 #ifdef SMP 233 wakeup_cpus = PCPU_GET(other_cpus); 234 #endif 235 236 AcpiSetFirmwareWakingVector(WAKECODE_PADDR(sc)); 237 238 rf = intr_disable(); 239 intr_suspend(); 240 241 /* 242 * Temporarily switch to the kernel pmap because it provides 243 * an identity mapping (setup at boot) for the low physical 244 * memory region containing the wakeup code. 245 */ 246 cr3 = rcr3(); 247 load_cr3(KPML4phys); 248 249 if (savectx(susppcbs[0])) { 250 ctx_fpusave(suspfpusave[0]); 251 #ifdef SMP 252 if (wakeup_cpus != 0 && suspend_cpus(wakeup_cpus) == 0) { 253 device_printf(sc->acpi_dev, 254 "Failed to suspend APs: CPU mask = 0x%jx\n", 255 (uintmax_t)(wakeup_cpus & ~stopped_cpus)); 256 goto out; 257 } 258 #endif 259 260 WAKECODE_FIXUP(resume_beep, uint8_t, (acpi_resume_beep != 0)); 261 WAKECODE_FIXUP(reset_video, uint8_t, (acpi_reset_video != 0)); 262 263 WAKECODE_FIXUP(wakeup_pcb, struct pcb *, susppcbs[0]); 264 WAKECODE_FIXUP(wakeup_fpusave, void *, suspfpusave[0]); 265 WAKECODE_FIXUP(wakeup_gdt, uint16_t, 266 susppcbs[0]->pcb_gdt.rd_limit); 267 WAKECODE_FIXUP(wakeup_gdt + 2, uint64_t, 268 susppcbs[0]->pcb_gdt.rd_base); 269 WAKECODE_FIXUP(wakeup_cpu, int, 0); 270 271 /* Call ACPICA to enter the desired sleep state */ 272 if (state == ACPI_STATE_S4 && sc->acpi_s4bios) 273 status = AcpiEnterSleepStateS4bios(); 274 else 275 status = AcpiEnterSleepState(state); 276 277 if (status != AE_OK) { 278 device_printf(sc->acpi_dev, 279 "AcpiEnterSleepState failed - %s\n", 280 AcpiFormatException(status)); 281 goto out; 282 } 283 284 for (;;) 285 ia32_pause(); 286 } else { 287 pmap_init_pat(); 288 PCPU_SET(switchtime, 0); 289 PCPU_SET(switchticks, ticks); 290 #ifdef SMP 291 if (wakeup_cpus != 0) 292 acpi_wakeup_cpus(sc, wakeup_cpus); 293 #endif 294 acpi_resync_clock(sc); 295 ret = 0; 296 } 297 298 out: 299 #ifdef SMP 300 if (wakeup_cpus != 0) 301 restart_cpus(wakeup_cpus); 302 #endif 303 304 load_cr3(cr3); 305 mca_resume(); 306 intr_resume(); 307 intr_restore(rf); 308 309 AcpiSetFirmwareWakingVector(0); 310 311 if (ret == 0 && mem_range_softc.mr_op != NULL && 312 mem_range_softc.mr_op->reinit != NULL) 313 mem_range_softc.mr_op->reinit(&mem_range_softc); 314 315 /* If we beeped, turn it off after a delay. */ 316 if (acpi_resume_beep) 317 timeout(acpi_stop_beep, NULL, 3 * hz); 318 319 return (ret); 320 } 321 322 static void * 323 acpi_alloc_wakeup_handler(void) 324 { 325 void *wakeaddr; 326 int i; 327 328 /* 329 * Specify the region for our wakeup code. We want it in the low 1 MB 330 * region, excluding real mode IVT (0-0x3ff), BDA (0x400-0x4ff), EBDA 331 * (less than 128KB, below 0xa0000, must be excluded by SMAP and DSDT), 332 * and ROM area (0xa0000 and above). The temporary page tables must be 333 * page-aligned. 334 */ 335 wakeaddr = contigmalloc(4 * PAGE_SIZE, M_DEVBUF, M_NOWAIT, 0x500, 336 0xa0000, PAGE_SIZE, 0ul); 337 if (wakeaddr == NULL) { 338 printf("%s: can't alloc wake memory\n", __func__); 339 return (NULL); 340 } 341 susppcbs = malloc(mp_ncpus * sizeof(*susppcbs), M_DEVBUF, M_WAITOK); 342 suspfpusave = malloc(mp_ncpus * sizeof(void *), M_DEVBUF, M_WAITOK); 343 for (i = 0; i < mp_ncpus; i++) { 344 susppcbs[i] = malloc(sizeof(**susppcbs), M_DEVBUF, M_WAITOK); 345 suspfpusave[i] = alloc_fpusave(M_WAITOK); 346 } 347 348 return (wakeaddr); 349 } 350 351 void 352 acpi_install_wakeup_handler(struct acpi_softc *sc) 353 { 354 static void *wakeaddr = NULL; 355 uint64_t *pt4, *pt3, *pt2; 356 int i; 357 358 if (wakeaddr != NULL) 359 return; 360 361 wakeaddr = acpi_alloc_wakeup_handler(); 362 if (wakeaddr == NULL) 363 return; 364 365 sc->acpi_wakeaddr = (vm_offset_t)wakeaddr; 366 sc->acpi_wakephys = vtophys(wakeaddr); 367 368 bcopy(wakecode, (void *)WAKECODE_VADDR(sc), sizeof(wakecode)); 369 370 /* Patch GDT base address, ljmp targets and page table base address. */ 371 WAKECODE_FIXUP((bootgdtdesc + 2), uint32_t, 372 WAKECODE_PADDR(sc) + bootgdt); 373 WAKECODE_FIXUP((wakeup_sw32 + 2), uint32_t, 374 WAKECODE_PADDR(sc) + wakeup_32); 375 WAKECODE_FIXUP((wakeup_sw64 + 1), uint32_t, 376 WAKECODE_PADDR(sc) + wakeup_64); 377 WAKECODE_FIXUP(wakeup_pagetables, uint32_t, sc->acpi_wakephys); 378 379 /* Save pointers to some global data. */ 380 WAKECODE_FIXUP(wakeup_retaddr, void *, acpi_restorecpu); 381 WAKECODE_FIXUP(wakeup_kpml4, uint64_t, KPML4phys); 382 WAKECODE_FIXUP(wakeup_ctx, vm_offset_t, 383 WAKECODE_VADDR(sc) + wakeup_ctx); 384 WAKECODE_FIXUP(wakeup_efer, uint64_t, rdmsr(MSR_EFER)); 385 WAKECODE_FIXUP(wakeup_star, uint64_t, rdmsr(MSR_STAR)); 386 WAKECODE_FIXUP(wakeup_lstar, uint64_t, rdmsr(MSR_LSTAR)); 387 WAKECODE_FIXUP(wakeup_cstar, uint64_t, rdmsr(MSR_CSTAR)); 388 WAKECODE_FIXUP(wakeup_sfmask, uint64_t, rdmsr(MSR_SF_MASK)); 389 390 /* Build temporary page tables below realmode code. */ 391 pt4 = wakeaddr; 392 pt3 = pt4 + (PAGE_SIZE) / sizeof(uint64_t); 393 pt2 = pt3 + (PAGE_SIZE) / sizeof(uint64_t); 394 395 /* Create the initial 1GB replicated page tables */ 396 for (i = 0; i < 512; i++) { 397 /* 398 * Each slot of the level 4 pages points 399 * to the same level 3 page 400 */ 401 pt4[i] = (uint64_t)(sc->acpi_wakephys + PAGE_SIZE); 402 pt4[i] |= PG_V | PG_RW | PG_U; 403 404 /* 405 * Each slot of the level 3 pages points 406 * to the same level 2 page 407 */ 408 pt3[i] = (uint64_t)(sc->acpi_wakephys + (2 * PAGE_SIZE)); 409 pt3[i] |= PG_V | PG_RW | PG_U; 410 411 /* The level 2 page slots are mapped with 2MB pages for 1GB. */ 412 pt2[i] = i * (2 * 1024 * 1024); 413 pt2[i] |= PG_V | PG_RW | PG_PS | PG_U; 414 } 415 416 if (bootverbose) 417 device_printf(sc->acpi_dev, "wakeup code va %p pa %p\n", 418 (void *)sc->acpi_wakeaddr, (void *)sc->acpi_wakephys); 419 }
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