sys/i386/acpica/acpi_wakeup.c

   1 /*-
   2  * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org>
   3  * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/param.h>
  32 #include <sys/systm.h>
  33 #include <sys/kernel.h>
  34 #include <sys/bus.h>
  35 #include <sys/lock.h>
  36 #include <sys/proc.h>
  37 #include <sys/sysctl.h>
  38
  39 #include <vm/vm.h>
  40 #include <vm/pmap.h>
  41 #include <vm/vm_object.h>
  42 #include <vm/vm_page.h>
  43 #include <vm/vm_map.h>
  44
  45 #include <machine/bus.h>
  46 #include <machine/cpufunc.h>
  47 #include <machine/intr_machdep.h>
  48 #include <machine/segments.h>
  49
  50 #include <contrib/dev/acpica/include/acpi.h>
  51
  52 #include <dev/acpica/acpivar.h>
  53
  54 #include "acpi_wakecode.h"
  55
  56 /* Make sure the code is less than one page and leave room for the stack. */
  57 CTASSERT(sizeof(wakecode) < PAGE_SIZE - 1024);
  58
  59 #ifndef _SYS_CDEFS_H_
  60 #error this file needs sys/cdefs.h as a prerequisite
  61 #endif
  62
  63 extern uint32_t acpi_resume_beep;
  64 extern uint32_t acpi_reset_video;
  65 extern void     initializecpu(void);
  66
  67 static struct region_descriptor __used  saved_idt, saved_gdt;
  68 static struct region_descriptor *p_gdt;
  69 static uint16_t __used  saved_ldt;
  70
  71 static uint32_t __used  r_eax, r_ebx, r_ecx, r_edx, r_ebp, r_esi, r_edi,
  72                         r_efl, r_cr0, r_cr2, r_cr3, r_cr4, ret_addr;
  73
  74 static uint16_t __used  r_cs, r_ds, r_es, r_fs, r_gs, r_ss, r_tr;
  75 static uint32_t __used  r_esp;
  76
  77 static void             acpi_printcpu(void);
  78 static void             acpi_realmodeinst(void *arg, bus_dma_segment_t *segs,
  79                                           int nsegs, int error);
  80 static void             acpi_alloc_wakeup_handler(void);
  81
  82 /* XXX shut gcc up */
  83 extern int              acpi_savecpu(void);
  84 extern int              acpi_restorecpu(void);
  85
  86 #ifdef __GNUCLIKE_ASM
  87 __asm__("                               \n\
  88         .text                           \n\
  89         .p2align 2, 0x90                \n\
  90         .type acpi_restorecpu, @function\n\
  91 acpi_restorecpu:                        \n\
  92         .align 4                        \n\
  93         movl    r_eax,%eax              \n\
  94         movl    r_ebx,%ebx              \n\
  95         movl    r_ecx,%ecx              \n\
  96         movl    r_edx,%edx              \n\
  97         movl    r_ebp,%ebp              \n\
  98         movl    r_esi,%esi              \n\
  99         movl    r_edi,%edi              \n\
 100         movl    r_esp,%esp              \n\
 101                                         \n\
 102         pushl   r_efl                   \n\
 103         popfl                           \n\
 104                                         \n\
 105         movl    ret_addr,%eax           \n\
 106         movl    %eax,(%esp)             \n\
 107         xorl    %eax,%eax               \n\
 108         ret                             \n\
 109                                         \n\
 110         .text                           \n\
 111         .p2align 2, 0x90                \n\
 112         .type acpi_savecpu, @function   \n\
 113 acpi_savecpu:                           \n\
 114         movw    %cs,r_cs                \n\
 115         movw    %ds,r_ds                \n\
 116         movw    %es,r_es                \n\
 117         movw    %fs,r_fs                \n\
 118         movw    %gs,r_gs                \n\
 119         movw    %ss,r_ss                \n\
 120                                         \n\
 121         movl    %eax,r_eax              \n\
 122         movl    %ebx,r_ebx              \n\
 123         movl    %ecx,r_ecx              \n\
 124         movl    %edx,r_edx              \n\
 125         movl    %ebp,r_ebp              \n\
 126         movl    %esi,r_esi              \n\
 127         movl    %edi,r_edi              \n\
 128                                         \n\
 129         movl    %cr0,%eax               \n\
 130         movl    %eax,r_cr0              \n\
 131         movl    %cr2,%eax               \n\
 132         movl    %eax,r_cr2              \n\
 133         movl    %cr3,%eax               \n\
 134         movl    %eax,r_cr3              \n\
 135         movl    %cr4,%eax               \n\
 136         movl    %eax,r_cr4              \n\
 137                                         \n\
 138         pushfl                          \n\
 139         popl    r_efl                   \n\
 140                                         \n\
 141         movl    %esp,r_esp              \n\
 142                                         \n\
 143         sgdt    saved_gdt               \n\
 144         sidt    saved_idt               \n\
 145         sldt    saved_ldt               \n\
 146         str     r_tr                    \n\
 147                                         \n\
 148         movl    (%esp),%eax             \n\
 149         movl    %eax,ret_addr           \n\
 150         movl    $1,%eax                 \n\
 151         ret                             \n\
 152 ");
 153 #endif /* __GNUCLIKE_ASM */
 154
 155 static void
 156 acpi_printcpu(void)
 157 {
 158         printf("======== acpi_printcpu() debug dump ========\n");
 159         printf("gdt[%04x:%08x] idt[%04x:%08x] ldt[%04x] tr[%04x] efl[%08x]\n",
 160                 saved_gdt.rd_limit, saved_gdt.rd_base,
 161                 saved_idt.rd_limit, saved_idt.rd_base,
 162                 saved_ldt, r_tr, r_efl);
 163         printf("eax[%08x] ebx[%08x] ecx[%08x] edx[%08x]\n",
 164                 r_eax, r_ebx, r_ecx, r_edx);
 165         printf("esi[%08x] edi[%08x] ebp[%08x] esp[%08x]\n",
 166                 r_esi, r_edi, r_ebp, r_esp);
 167         printf("cr0[%08x] cr2[%08x] cr3[%08x] cr4[%08x]\n",
 168                 r_cr0, r_cr2, r_cr3, r_cr4);
 169         printf("cs[%04x] ds[%04x] es[%04x] fs[%04x] gs[%04x] ss[%04x]\n",
 170                 r_cs, r_ds, r_es, r_fs, r_gs, r_ss);
 171 }
 172
 173 #define WAKECODE_FIXUP(offset, type, val) do    {               \
 174         type    *addr;                                          \
 175         addr = (type *)(sc->acpi_wakeaddr + offset);            \
 176         *addr = val;                                            \
 177 } while (0)
 178
 179 #define WAKECODE_BCOPY(offset, type, val) do    {               \
 180         void    *addr;                                          \
 181         addr = (void *)(sc->acpi_wakeaddr + offset);            \
 182         bcopy(&(val), addr, sizeof(type));                      \
 183 } while (0)
 184
 185 /* Turn off bits 1&2 of the PIT, stopping the beep. */
 186 static void
 187 acpi_stop_beep(void *arg)
 188 {
 189         outb(0x61, inb(0x61) & ~0x3);
 190 }
 191
 192 int
 193 acpi_sleep_machdep(struct acpi_softc *sc, int state)
 194 {
 195         ACPI_STATUS             status;
 196         struct pmap             *pm;
 197         int                     ret;
 198         uint32_t                cr3;
 199         u_long                  ef;
 200
 201         ret = 0;
 202         if (sc->acpi_wakeaddr == 0)
 203                 return (0);
 204
 205         AcpiSetFirmwareWakingVector(sc->acpi_wakephys);
 206
 207         ef = read_eflags();
 208
 209         /*
 210          * Temporarily switch to the kernel pmap because it provides an
 211          * identity mapping (setup at boot) for the low physical memory
 212          * region containing the wakeup code.
 213          */
 214         pm = kernel_pmap;
 215         cr3 = rcr3();
 216 #ifdef PAE
 217         load_cr3(vtophys(pm->pm_pdpt));
 218 #else
 219         load_cr3(vtophys(pm->pm_pdir));
 220 #endif
 221
 222         ret_addr = 0;
 223         ACPI_DISABLE_IRQS();
 224         if (acpi_savecpu()) {
 225                 /* Execute Sleep */
 226                 intr_suspend();
 227
 228                 p_gdt = (struct region_descriptor *)
 229                                 (sc->acpi_wakeaddr + physical_gdt);
 230                 p_gdt->rd_limit = saved_gdt.rd_limit;
 231                 p_gdt->rd_base = vtophys(saved_gdt.rd_base);
 232
 233                 WAKECODE_FIXUP(physical_esp, uint32_t, vtophys(r_esp));
 234                 WAKECODE_FIXUP(previous_cr0, uint32_t, r_cr0);
 235                 WAKECODE_FIXUP(previous_cr2, uint32_t, r_cr2);
 236                 WAKECODE_FIXUP(previous_cr3, uint32_t, r_cr3);
 237                 WAKECODE_FIXUP(previous_cr4, uint32_t, r_cr4);
 238
 239                 WAKECODE_FIXUP(resume_beep, uint32_t, acpi_resume_beep);
 240                 WAKECODE_FIXUP(reset_video, uint32_t, acpi_reset_video);
 241
 242                 WAKECODE_FIXUP(previous_tr,  uint16_t, r_tr);
 243                 WAKECODE_BCOPY(previous_gdt, struct region_descriptor, saved_gdt);
 244                 WAKECODE_FIXUP(previous_ldt, uint16_t, saved_ldt);
 245                 WAKECODE_BCOPY(previous_idt, struct region_descriptor, saved_idt);
 246
 247                 WAKECODE_FIXUP(where_to_recover, void *, acpi_restorecpu);
 248
 249                 WAKECODE_FIXUP(previous_ds,  uint16_t, r_ds);
 250                 WAKECODE_FIXUP(previous_es,  uint16_t, r_es);
 251                 WAKECODE_FIXUP(previous_fs,  uint16_t, r_fs);
 252                 WAKECODE_FIXUP(previous_gs,  uint16_t, r_gs);
 253                 WAKECODE_FIXUP(previous_ss,  uint16_t, r_ss);
 254
 255                 if (bootverbose)
 256                         acpi_printcpu();
 257
 258                 /* Call ACPICA to enter the desired sleep state */
 259                 if (state == ACPI_STATE_S4 && sc->acpi_s4bios)
 260                         status = AcpiEnterSleepStateS4bios();
 261                 else
 262                         status = AcpiEnterSleepState(state);
 263
 264                 if (status != AE_OK) {
 265                         device_printf(sc->acpi_dev,
 266                                 "AcpiEnterSleepState failed - %s\n",
 267                                 AcpiFormatException(status));
 268                         ret = -1;
 269                         goto out;
 270                 }
 271
 272                 for (;;) ;
 273         } else {
 274                 /* Execute Wakeup */
 275                 intr_resume();
 276
 277                 if (bootverbose) {
 278                         acpi_savecpu();
 279                         acpi_printcpu();
 280                 }
 281         }
 282
 283 out:
 284         load_cr3(cr3);
 285         write_eflags(ef);
 286
 287         /* If we beeped, turn it off after a delay. */
 288         if (acpi_resume_beep)
 289                 timeout(acpi_stop_beep, NULL, 3 * hz);
 290
 291         return (ret);
 292 }
 293
 294 static bus_dma_tag_t    acpi_waketag;
 295 static bus_dmamap_t     acpi_wakemap;
 296 static vm_offset_t      acpi_wakeaddr;
 297
 298 static void
 299 acpi_alloc_wakeup_handler(void)
 300 {
 301         void *wakeaddr;
 302
 303         if (!cold)
 304                 return;
 305
 306         /*
 307          * Specify the region for our wakeup code.  We want it in the low 1 MB
 308          * region, excluding video memory and above (0xa0000).  We ask for
 309          * it to be page-aligned, just to be safe.
 310          */
 311         if (bus_dma_tag_create(/*parent*/ NULL,
 312             /*alignment*/ PAGE_SIZE, /*no boundary*/ 0,
 313             /*lowaddr*/ 0x9ffff, /*highaddr*/ BUS_SPACE_MAXADDR, NULL, NULL,
 314             /*maxsize*/ PAGE_SIZE, /*segments*/ 1, /*maxsegsize*/ PAGE_SIZE,
 315             0, busdma_lock_mutex, &Giant, &acpi_waketag) != 0) {
 316                 printf("acpi_alloc_wakeup_handler: can't create wake tag\n");
 317                 return;
 318         }
 319         if (bus_dmamem_alloc(acpi_waketag, &wakeaddr, BUS_DMA_NOWAIT,
 320             &acpi_wakemap) != 0) {
 321                 printf("acpi_alloc_wakeup_handler: can't alloc wake memory\n");
 322                 return;
 323         }
 324         acpi_wakeaddr = (vm_offset_t)wakeaddr;
 325 }
 326
 327 SYSINIT(acpiwakeup, SI_SUB_KMEM, SI_ORDER_ANY, acpi_alloc_wakeup_handler, 0);
 328
 329 static void
 330 acpi_realmodeinst(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
 331 {
 332         struct acpi_softc *sc;
 333         uint32_t *addr;
 334
 335         /* Overwrite the ljmp target with the real address */
 336         sc = arg;
 337         sc->acpi_wakephys = segs[0].ds_addr;
 338         addr = (uint32_t *)&wakecode[wakeup_sw32 + 2];
 339         *addr = sc->acpi_wakephys + wakeup_32;
 340
 341         /* Copy the wake code into our low page and save its physical addr. */
 342         bcopy(wakecode, (void *)sc->acpi_wakeaddr, sizeof(wakecode));
 343         if (bootverbose) {
 344                 device_printf(sc->acpi_dev, "wakeup code va %#x pa %#jx\n",
 345                     acpi_wakeaddr, (uintmax_t)sc->acpi_wakephys);
 346         }
 347 }
 348
 349 void
 350 acpi_install_wakeup_handler(struct acpi_softc *sc)
 351 {
 352         if (acpi_wakeaddr == 0)
 353                 return;
 354
 355         sc->acpi_waketag = acpi_waketag;
 356         sc->acpi_wakeaddr = acpi_wakeaddr;
 357         sc->acpi_wakemap = acpi_wakemap;
 358
 359         bus_dmamap_load(sc->acpi_waketag, sc->acpi_wakemap,
 360             (void *)sc->acpi_wakeaddr, PAGE_SIZE, acpi_realmodeinst, sc, 0);
 361 }