The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/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  * 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: releng/8.3/sys/i386/acpica/acpi_wakeup.c 210509 2010-07-26 18:22:46Z jhb $");
   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/mca.h>
   49 #include <machine/segments.h>
   50 
   51 #include <contrib/dev/acpica/include/acpi.h>
   52 
   53 #include <dev/acpica/acpivar.h>
   54 
   55 #include "acpi_wakecode.h"
   56 
   57 /* Make sure the code is less than one page and leave room for the stack. */
   58 CTASSERT(sizeof(wakecode) < PAGE_SIZE - 1024);
   59 
   60 #ifndef _SYS_CDEFS_H_
   61 #error this file needs sys/cdefs.h as a prerequisite
   62 #endif
   63 
   64 extern uint32_t acpi_resume_beep;
   65 extern uint32_t acpi_reset_video;
   66 extern void     initializecpu(void);
   67 
   68 static struct region_descriptor __used  saved_idt, saved_gdt;
   69 static struct region_descriptor *p_gdt;
   70 static uint16_t __used  saved_ldt;
   71 
   72 static uint32_t __used  r_eax, r_ebx, r_ecx, r_edx, r_ebp, r_esi, r_edi,
   73                         r_efl, r_cr0, r_cr2, r_cr3, r_cr4, ret_addr;
   74 
   75 static uint16_t __used  r_cs, r_ds, r_es, r_fs, r_gs, r_ss, r_tr;
   76 static uint32_t __used  r_esp;
   77 
   78 static void             acpi_printcpu(void);
   79 static void             acpi_realmodeinst(void *arg, bus_dma_segment_t *segs,
   80                                           int nsegs, int error);
   81 static void             acpi_alloc_wakeup_handler(void);
   82 
   83 /* XXX shut gcc up */
   84 extern int              acpi_savecpu(void);
   85 extern int              acpi_restorecpu(void);
   86 
   87 #ifdef __GNUCLIKE_ASM
   88 __asm__("                               \n\
   89         .text                           \n\
   90         .p2align 2, 0x90                \n\
   91         .type acpi_restorecpu, @function\n\
   92 acpi_restorecpu:                        \n\
   93         .align 4                        \n\
   94         movl    r_eax,%eax              \n\
   95         movl    r_ebx,%ebx              \n\
   96         movl    r_ecx,%ecx              \n\
   97         movl    r_edx,%edx              \n\
   98         movl    r_ebp,%ebp              \n\
   99         movl    r_esi,%esi              \n\
  100         movl    r_edi,%edi              \n\
  101         movl    r_esp,%esp              \n\
  102                                         \n\
  103         pushl   r_efl                   \n\
  104         popfl                           \n\
  105                                         \n\
  106         movl    ret_addr,%eax           \n\
  107         movl    %eax,(%esp)             \n\
  108         xorl    %eax,%eax               \n\
  109         ret                             \n\
  110                                         \n\
  111         .text                           \n\
  112         .p2align 2, 0x90                \n\
  113         .type acpi_savecpu, @function   \n\
  114 acpi_savecpu:                           \n\
  115         movw    %cs,r_cs                \n\
  116         movw    %ds,r_ds                \n\
  117         movw    %es,r_es                \n\
  118         movw    %fs,r_fs                \n\
  119         movw    %gs,r_gs                \n\
  120         movw    %ss,r_ss                \n\
  121                                         \n\
  122         movl    %eax,r_eax              \n\
  123         movl    %ebx,r_ebx              \n\
  124         movl    %ecx,r_ecx              \n\
  125         movl    %edx,r_edx              \n\
  126         movl    %ebp,r_ebp              \n\
  127         movl    %esi,r_esi              \n\
  128         movl    %edi,r_edi              \n\
  129                                         \n\
  130         movl    %cr0,%eax               \n\
  131         movl    %eax,r_cr0              \n\
  132         movl    %cr2,%eax               \n\
  133         movl    %eax,r_cr2              \n\
  134         movl    %cr3,%eax               \n\
  135         movl    %eax,r_cr3              \n\
  136         movl    %cr4,%eax               \n\
  137         movl    %eax,r_cr4              \n\
  138                                         \n\
  139         pushfl                          \n\
  140         popl    r_efl                   \n\
  141                                         \n\
  142         movl    %esp,r_esp              \n\
  143                                         \n\
  144         sgdt    saved_gdt               \n\
  145         sidt    saved_idt               \n\
  146         sldt    saved_ldt               \n\
  147         str     r_tr                    \n\
  148                                         \n\
  149         movl    (%esp),%eax             \n\
  150         movl    %eax,ret_addr           \n\
  151         movl    $1,%eax                 \n\
  152         ret                             \n\
  153 ");
  154 #endif /* __GNUCLIKE_ASM */
  155 
  156 static void
  157 acpi_printcpu(void)
  158 {
  159         printf("======== acpi_printcpu() debug dump ========\n");
  160         printf("gdt[%04x:%08x] idt[%04x:%08x] ldt[%04x] tr[%04x] efl[%08x]\n",
  161                 saved_gdt.rd_limit, saved_gdt.rd_base,
  162                 saved_idt.rd_limit, saved_idt.rd_base,
  163                 saved_ldt, r_tr, r_efl);
  164         printf("eax[%08x] ebx[%08x] ecx[%08x] edx[%08x]\n",
  165                 r_eax, r_ebx, r_ecx, r_edx);
  166         printf("esi[%08x] edi[%08x] ebp[%08x] esp[%08x]\n",
  167                 r_esi, r_edi, r_ebp, r_esp);
  168         printf("cr0[%08x] cr2[%08x] cr3[%08x] cr4[%08x]\n",
  169                 r_cr0, r_cr2, r_cr3, r_cr4);
  170         printf("cs[%04x] ds[%04x] es[%04x] fs[%04x] gs[%04x] ss[%04x]\n",
  171                 r_cs, r_ds, r_es, r_fs, r_gs, r_ss);
  172 }
  173 
  174 #define WAKECODE_FIXUP(offset, type, val) do    {               \
  175         type    *addr;                                          \
  176         addr = (type *)(sc->acpi_wakeaddr + offset);            \
  177         *addr = val;                                            \
  178 } while (0)
  179 
  180 #define WAKECODE_BCOPY(offset, type, val) do    {               \
  181         void    *addr;                                          \
  182         addr = (void *)(sc->acpi_wakeaddr + offset);            \
  183         bcopy(&(val), addr, sizeof(type));                      \
  184 } while (0)
  185 
  186 /* Turn off bits 1&2 of the PIT, stopping the beep. */
  187 static void
  188 acpi_stop_beep(void *arg)
  189 {
  190         outb(0x61, inb(0x61) & ~0x3);
  191 }
  192 
  193 int
  194 acpi_sleep_machdep(struct acpi_softc *sc, int state)
  195 {
  196         ACPI_STATUS             status;
  197         struct pmap             *pm;
  198         int                     ret;
  199         uint32_t                cr3;
  200         u_long                  ef;
  201 
  202         ret = 0;
  203         if (sc->acpi_wakeaddr == 0)
  204                 return (0);
  205 
  206         AcpiSetFirmwareWakingVector(sc->acpi_wakephys);
  207 
  208         ef = read_eflags();
  209 
  210         /*
  211          * Temporarily switch to the kernel pmap because it provides an
  212          * identity mapping (setup at boot) for the low physical memory
  213          * region containing the wakeup code.
  214          */
  215         pm = kernel_pmap;
  216         cr3 = rcr3();
  217 #ifdef PAE
  218         load_cr3(vtophys(pm->pm_pdpt));
  219 #else
  220         load_cr3(vtophys(pm->pm_pdir));
  221 #endif
  222 
  223         ret_addr = 0;
  224         ACPI_DISABLE_IRQS();
  225         if (acpi_savecpu()) {
  226                 /* Execute Sleep */
  227                 intr_suspend();
  228 
  229                 p_gdt = (struct region_descriptor *)
  230                                 (sc->acpi_wakeaddr + physical_gdt);
  231                 p_gdt->rd_limit = saved_gdt.rd_limit;
  232                 p_gdt->rd_base = vtophys(saved_gdt.rd_base);
  233 
  234                 WAKECODE_FIXUP(physical_esp, uint32_t, vtophys(r_esp));
  235                 WAKECODE_FIXUP(previous_cr0, uint32_t, r_cr0);
  236                 WAKECODE_FIXUP(previous_cr2, uint32_t, r_cr2);
  237                 WAKECODE_FIXUP(previous_cr3, uint32_t, r_cr3);
  238                 WAKECODE_FIXUP(previous_cr4, uint32_t, r_cr4);
  239 
  240                 WAKECODE_FIXUP(resume_beep, uint32_t, acpi_resume_beep);
  241                 WAKECODE_FIXUP(reset_video, uint32_t, acpi_reset_video);
  242 
  243                 WAKECODE_FIXUP(previous_tr,  uint16_t, r_tr);
  244                 WAKECODE_BCOPY(previous_gdt, struct region_descriptor, saved_gdt);
  245                 WAKECODE_FIXUP(previous_ldt, uint16_t, saved_ldt);
  246                 WAKECODE_BCOPY(previous_idt, struct region_descriptor, saved_idt);
  247 
  248                 WAKECODE_FIXUP(where_to_recover, void *, acpi_restorecpu);
  249 
  250                 WAKECODE_FIXUP(previous_ds,  uint16_t, r_ds);
  251                 WAKECODE_FIXUP(previous_es,  uint16_t, r_es);
  252                 WAKECODE_FIXUP(previous_fs,  uint16_t, r_fs);
  253                 WAKECODE_FIXUP(previous_gs,  uint16_t, r_gs);
  254                 WAKECODE_FIXUP(previous_ss,  uint16_t, r_ss);
  255 
  256                 if (bootverbose)
  257                         acpi_printcpu();
  258 
  259                 /* Call ACPICA to enter the desired sleep state */
  260                 if (state == ACPI_STATE_S4 && sc->acpi_s4bios)
  261                         status = AcpiEnterSleepStateS4bios();
  262                 else
  263                         status = AcpiEnterSleepState(state);
  264 
  265                 if (status != AE_OK) {
  266                         device_printf(sc->acpi_dev,
  267                                 "AcpiEnterSleepState failed - %s\n",
  268                                 AcpiFormatException(status));
  269                         ret = -1;
  270                         goto out;
  271                 }
  272 
  273                 for (;;) ;
  274         } else {
  275                 /* Execute Wakeup */
  276                 mca_resume();
  277                 intr_resume();
  278 
  279                 if (bootverbose) {
  280                         acpi_savecpu();
  281                         acpi_printcpu();
  282                 }
  283         }
  284 
  285 out:
  286         load_cr3(cr3);
  287         write_eflags(ef);
  288 
  289         /* If we beeped, turn it off after a delay. */
  290         if (acpi_resume_beep)
  291                 timeout(acpi_stop_beep, NULL, 3 * hz);
  292 
  293         return (ret);
  294 }
  295 
  296 static bus_dma_tag_t    acpi_waketag;
  297 static bus_dmamap_t     acpi_wakemap;
  298 static vm_offset_t      acpi_wakeaddr;
  299 
  300 static void
  301 acpi_alloc_wakeup_handler(void)
  302 {
  303         void *wakeaddr;
  304 
  305         if (!cold)
  306                 return;
  307 
  308         /*
  309          * Specify the region for our wakeup code.  We want it in the low 1 MB
  310          * region, excluding video memory and above (0xa0000).  We ask for
  311          * it to be page-aligned, just to be safe.
  312          */
  313         if (bus_dma_tag_create(/*parent*/ NULL,
  314             /*alignment*/ PAGE_SIZE, /*no boundary*/ 0,
  315             /*lowaddr*/ 0x9ffff, /*highaddr*/ BUS_SPACE_MAXADDR, NULL, NULL,
  316             /*maxsize*/ PAGE_SIZE, /*segments*/ 1, /*maxsegsize*/ PAGE_SIZE,
  317             0, busdma_lock_mutex, &Giant, &acpi_waketag) != 0) {
  318                 printf("acpi_alloc_wakeup_handler: can't create wake tag\n");
  319                 return;
  320         }
  321         if (bus_dmamem_alloc(acpi_waketag, &wakeaddr, BUS_DMA_NOWAIT,
  322             &acpi_wakemap) != 0) {
  323                 printf("acpi_alloc_wakeup_handler: can't alloc wake memory\n");
  324                 return;
  325         }
  326         acpi_wakeaddr = (vm_offset_t)wakeaddr;
  327 }
  328 
  329 SYSINIT(acpiwakeup, SI_SUB_KMEM, SI_ORDER_ANY, acpi_alloc_wakeup_handler, 0);
  330 
  331 static void
  332 acpi_realmodeinst(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
  333 {
  334         struct acpi_softc *sc;
  335         uint32_t *addr;
  336 
  337         /* Overwrite the ljmp target with the real address */
  338         sc = arg;
  339         sc->acpi_wakephys = segs[0].ds_addr;
  340         addr = (uint32_t *)&wakecode[wakeup_sw32 + 2];
  341         *addr = sc->acpi_wakephys + wakeup_32;
  342 
  343         /* Copy the wake code into our low page and save its physical addr. */
  344         bcopy(wakecode, (void *)sc->acpi_wakeaddr, sizeof(wakecode));
  345         if (bootverbose) {
  346                 device_printf(sc->acpi_dev, "wakeup code va %#x pa %#jx\n",
  347                     acpi_wakeaddr, (uintmax_t)sc->acpi_wakephys);
  348         }
  349 }
  350 
  351 void
  352 acpi_install_wakeup_handler(struct acpi_softc *sc)
  353 {
  354         if (acpi_wakeaddr == 0)
  355                 return;
  356 
  357         sc->acpi_waketag = acpi_waketag;
  358         sc->acpi_wakeaddr = acpi_wakeaddr;
  359         sc->acpi_wakemap = acpi_wakemap;
  360 
  361         bus_dmamap_load(sc->acpi_waketag, sc->acpi_wakemap,
  362             (void *)sc->acpi_wakeaddr, PAGE_SIZE, acpi_realmodeinst, sc, 0);
  363 }

Cache object: 24faeec9c60b66f0bae353868611755c


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