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  *      $FreeBSD: releng/5.0/sys/i386/acpica/acpi_wakeup.c 107618 2002-12-04 18:40:39Z alc $
   28  */
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/bus.h>
   34 #include <sys/lock.h>
   35 #include <sys/proc.h>
   36 #include <sys/sysctl.h>
   37 
   38 #include <vm/vm.h>
   39 #include <vm/vm_param.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 #include <vm/vm_kern.h>
   45 #include <vm/vm_extern.h>
   46 
   47 #include <machine/bus.h>
   48 #include <machine/cpufunc.h>
   49 #include <machine/segments.h>
   50 
   51 #include <i386/isa/intr_machdep.h>
   52 
   53 #include "acpi.h"
   54 
   55 #include <dev/acpica/acpica_support.h>
   56 
   57 #include <dev/acpica/acpivar.h>
   58 
   59 #include "acpi_wakecode.h"
   60 
   61 extern void initializecpu(void);
   62 
   63 static struct region_descriptor r_idt, r_gdt, *p_gdt;
   64 static u_int16_t        r_ldt;
   65 
   66 static u_int32_t        r_eax, r_ebx, r_ecx, r_edx, r_ebp, r_esi, r_edi,
   67                         r_efl, r_cr0, r_cr2, r_cr3, r_cr4, ret_addr;
   68 
   69 static u_int16_t        r_cs, r_ds, r_es, r_fs, r_gs, r_ss, r_tr;
   70 static u_int32_t        r_esp = 0;
   71 
   72 static void             acpi_printcpu(void);
   73 static void             acpi_realmodeinst(void *arg, bus_dma_segment_t *segs,
   74                                           int nsegs, int error);
   75 static void             acpi_alloc_wakeup_handler(void);
   76 
   77 /* XXX shut gcc up */
   78 extern int              acpi_savecpu(void);
   79 extern int              acpi_restorecpu(void);
   80 
   81 #ifdef __GNUC__
   82 __asm__("                               \n\
   83         .text                           \n\
   84         .p2align 2, 0x90                \n\
   85         .type acpi_restorecpu, @function\n\
   86 acpi_restorecpu:                        \n\
   87         .align 4                        \n\
   88         movl    r_eax,%eax              \n\
   89         movl    r_ebx,%ebx              \n\
   90         movl    r_ecx,%ecx              \n\
   91         movl    r_edx,%edx              \n\
   92         movl    r_ebp,%ebp              \n\
   93         movl    r_esi,%esi              \n\
   94         movl    r_edi,%edi              \n\
   95         movl    r_esp,%esp              \n\
   96                                         \n\
   97         pushl   r_efl                   \n\
   98         popfl                           \n\
   99                                         \n\
  100         movl    ret_addr,%eax           \n\
  101         movl    %eax,(%esp)             \n\
  102         xorl    %eax,%eax               \n\
  103         ret                             \n\
  104                                         \n\
  105         .text                           \n\
  106         .p2align 2, 0x90                \n\
  107         .type acpi_savecpu, @function   \n\
  108 acpi_savecpu:                           \n\
  109         movw    %cs,r_cs                \n\
  110         movw    %ds,r_ds                \n\
  111         movw    %es,r_es                \n\
  112         movw    %fs,r_fs                \n\
  113         movw    %gs,r_gs                \n\
  114         movw    %ss,r_ss                \n\
  115                                         \n\
  116         movl    %eax,r_eax              \n\
  117         movl    %ebx,r_ebx              \n\
  118         movl    %ecx,r_ecx              \n\
  119         movl    %edx,r_edx              \n\
  120         movl    %ebp,r_ebp              \n\
  121         movl    %esi,r_esi              \n\
  122         movl    %edi,r_edi              \n\
  123                                         \n\
  124         movl    %cr0,%eax               \n\
  125         movl    %eax,r_cr0              \n\
  126         movl    %cr2,%eax               \n\
  127         movl    %eax,r_cr2              \n\
  128         movl    %cr3,%eax               \n\
  129         movl    %eax,r_cr3              \n\
  130         movl    %cr4,%eax               \n\
  131         movl    %eax,r_cr4              \n\
  132                                         \n\
  133         pushfl                          \n\
  134         popl    r_efl                   \n\
  135                                         \n\
  136         movl    %esp,r_esp              \n\
  137                                         \n\
  138         sgdt    r_gdt                   \n\
  139         sidt    r_idt                   \n\
  140         sldt    r_ldt                   \n\
  141         str     r_tr                    \n\
  142                                         \n\
  143         movl    (%esp),%eax             \n\
  144         movl    %eax,ret_addr           \n\
  145         movl    $1,%eax                 \n\
  146         ret                             \n\
  147 ");
  148 #endif /* __GNUC__ */
  149 
  150 static void
  151 acpi_printcpu(void)
  152 {
  153 
  154         printf("======== acpi_printcpu() debug dump ========\n");
  155         printf("gdt[%04x:%08x] idt[%04x:%08x] ldt[%04x] tr[%04x] efl[%08x]\n",
  156                 r_gdt.rd_limit, r_gdt.rd_base, r_idt.rd_limit, r_idt.rd_base,
  157                 r_ldt, r_tr, r_efl);
  158         printf("eax[%08x] ebx[%08x] ecx[%08x] edx[%08x]\n",
  159                 r_eax, r_ebx, r_ecx, r_edx);
  160         printf("esi[%08x] edi[%08x] ebp[%08x] esp[%08x]\n",
  161                 r_esi, r_edi, r_ebp, r_esp);
  162         printf("cr0[%08x] cr2[%08x] cr3[%08x] cr4[%08x]\n",
  163                 r_cr0, r_cr2, r_cr3, r_cr4);
  164         printf("cs[%04x] ds[%04x] es[%04x] fs[%04x] gs[%04x] ss[%04x]\n",
  165                 r_cs, r_ds, r_es, r_fs, r_gs, r_ss);
  166 }
  167 
  168 #define WAKECODE_FIXUP(offset, type, val) do    {               \
  169         void    **addr;                                         \
  170         addr = (void **)(sc->acpi_wakeaddr + offset);           \
  171         (type *)*addr = val;                                    \
  172 } while (0)
  173 
  174 #define WAKECODE_BCOPY(offset, type, val) do    {               \
  175         void    **addr;                                         \
  176         addr = (void **)(sc->acpi_wakeaddr + offset);           \
  177         bcopy(&(val), addr, sizeof(type));                      \
  178 } while (0)
  179 
  180 int
  181 acpi_sleep_machdep(struct acpi_softc *sc, int state)
  182 {
  183         ACPI_STATUS             status;
  184         vm_offset_t             oldphys;
  185         struct pmap             *pm;
  186         vm_page_t               page;
  187         static vm_page_t        opage = NULL;
  188         int                     ret = 0;
  189         int                     pteobj_allocated = 0;
  190         u_long                  ef;
  191         struct proc             *p;
  192 
  193         if (sc->acpi_wakeaddr == 0) {
  194                 return (0);
  195         }
  196 
  197         AcpiSetFirmwareWakingVector(sc->acpi_wakephys);
  198 
  199         ef = read_eflags();
  200         disable_intr();
  201 
  202         /* Create Identity Mapping */
  203         if ((p = curproc) == NULL)
  204                 p = &proc0;
  205         pm = vmspace_pmap(p->p_vmspace);
  206         if (pm->pm_pteobj == NULL) {
  207                 pm->pm_pteobj = vm_object_allocate(OBJT_DEFAULT, PTDPTDI + 1);
  208                 pteobj_allocated = 1;
  209         }
  210 
  211         oldphys = pmap_extract(pm, sc->acpi_wakephys);
  212         if (oldphys) {
  213                 opage = PHYS_TO_VM_PAGE(oldphys);
  214         }
  215         page = PHYS_TO_VM_PAGE(sc->acpi_wakephys);
  216         pmap_enter(pm, sc->acpi_wakephys, page,
  217                    VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE, 1);
  218 
  219         ret_addr = 0;
  220         if (acpi_savecpu()) {
  221                 /* Execute Sleep */
  222                 p_gdt = (struct region_descriptor *)(sc->acpi_wakeaddr + physical_gdt);
  223                 p_gdt->rd_limit = r_gdt.rd_limit;
  224                 p_gdt->rd_base = vtophys(r_gdt.rd_base);
  225 
  226                 WAKECODE_FIXUP(physical_esp, u_int32_t, vtophys(r_esp));
  227                 WAKECODE_FIXUP(previous_cr0, u_int32_t, r_cr0);
  228                 WAKECODE_FIXUP(previous_cr2, u_int32_t, r_cr2);
  229                 WAKECODE_FIXUP(previous_cr3, u_int32_t, r_cr3);
  230                 WAKECODE_FIXUP(previous_cr4, u_int32_t, r_cr4);
  231 
  232                 WAKECODE_FIXUP(previous_tr,  u_int16_t, r_tr);
  233                 WAKECODE_BCOPY(previous_gdt, struct region_descriptor, r_gdt);
  234                 WAKECODE_FIXUP(previous_ldt, u_int16_t, r_ldt);
  235                 WAKECODE_BCOPY(previous_idt, struct region_descriptor, r_idt);
  236 
  237                 WAKECODE_FIXUP(where_to_recover, void, acpi_restorecpu);
  238 
  239                 WAKECODE_FIXUP(previous_ds,  u_int16_t, r_ds);
  240                 WAKECODE_FIXUP(previous_es,  u_int16_t, r_es);
  241                 WAKECODE_FIXUP(previous_fs,  u_int16_t, r_fs);
  242                 WAKECODE_FIXUP(previous_gs,  u_int16_t, r_gs);
  243                 WAKECODE_FIXUP(previous_ss,  u_int16_t, r_ss);
  244 
  245                 if (acpi_get_verbose(sc)) {
  246                         acpi_printcpu();
  247                 }
  248 
  249                 wbinvd(); 
  250 
  251                 if (state == ACPI_STATE_S4 && sc->acpi_s4bios) {
  252                         status = AcpiEnterSleepStateS4Bios();
  253                 } else {
  254                         status = AcpiEnterSleepState(state);
  255                 }
  256 
  257                 if (status != AE_OK) {
  258                         device_printf(sc->acpi_dev,
  259                                 "AcpiEnterSleepState failed - %s\n",
  260                                 AcpiFormatException(status));
  261                         ret = -1;
  262                         goto out;
  263                 }
  264 
  265                 for (;;) ;
  266         } else {
  267                 /* Execute Wakeup */
  268 #if 0
  269                 initializecpu();
  270 #endif
  271                 icu_reinit();
  272 
  273                 if (acpi_get_verbose(sc)) {
  274                         acpi_savecpu();
  275                         acpi_printcpu();
  276                 }
  277         }
  278 
  279 out:
  280         vm_page_lock_queues();
  281         pmap_remove(pm, sc->acpi_wakephys, sc->acpi_wakephys + PAGE_SIZE);
  282         vm_page_unlock_queues();
  283         if (opage) {
  284                 pmap_enter(pm, sc->acpi_wakephys, page,
  285                            VM_PROT_READ | VM_PROT_WRITE, 0);
  286         }
  287 
  288         if (pteobj_allocated) {
  289                 vm_object_deallocate(pm->pm_pteobj);
  290                 pm->pm_pteobj = NULL;
  291         }
  292 
  293         write_eflags(ef);
  294 
  295         return (ret);
  296 }
  297 
  298 static bus_dma_tag_t    acpi_waketag;
  299 static bus_dmamap_t     acpi_wakemap;
  300 static vm_offset_t      acpi_wakeaddr = 0;
  301 
  302 static void
  303 acpi_alloc_wakeup_handler(void)
  304 {
  305 
  306         if (!cold)
  307                 return;
  308 
  309         if (bus_dma_tag_create(/* parent */ NULL, /* alignment */ 2, 0,
  310                                /* lowaddr below 1MB */ 0x9ffff,
  311                                /* highaddr */ BUS_SPACE_MAXADDR, NULL, NULL,
  312                                 PAGE_SIZE, 1, PAGE_SIZE, 0, &acpi_waketag) != 0) {
  313                 printf("acpi_alloc_wakeup_handler: unable to create wake tag\n");
  314                 return;
  315         }
  316 
  317         if (bus_dmamem_alloc(acpi_waketag, (void **)&acpi_wakeaddr,
  318                              BUS_DMA_NOWAIT, &acpi_wakemap)) {
  319                 printf("acpi_alloc_wakeup_handler: unable to allocate wake memory\n");
  320                 return;
  321         }
  322 }
  323 
  324 SYSINIT(acpiwakeup, SI_SUB_KMEM, SI_ORDER_ANY, acpi_alloc_wakeup_handler, 0)
  325 
  326 static void
  327 acpi_realmodeinst(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
  328 {
  329         struct acpi_softc       *sc = arg;
  330         u_int32_t               *addr;
  331 
  332         addr = (u_int32_t *)&wakecode[wakeup_sw32 + 2];
  333         *addr = segs[0].ds_addr + wakeup_32;
  334         bcopy(wakecode, (void *)sc->acpi_wakeaddr, sizeof(wakecode));
  335         sc->acpi_wakephys = segs[0].ds_addr;
  336 }
  337 
  338 void
  339 acpi_install_wakeup_handler(struct acpi_softc *sc)
  340 {
  341 
  342         if (acpi_wakeaddr == 0) {
  343                 return;
  344         }
  345 
  346         sc->acpi_waketag = acpi_waketag;
  347         sc->acpi_wakeaddr = acpi_wakeaddr;
  348         sc->acpi_wakemap = acpi_wakemap;
  349 
  350         bus_dmamap_load(sc->acpi_waketag, sc->acpi_wakemap,
  351                         (void *)sc->acpi_wakeaddr, PAGE_SIZE,
  352                         acpi_realmodeinst, sc, 0);
  353 }
  354 

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