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/6.1/sys/i386/acpica/acpi_wakeup.c 152152 2005-11-07 09:53:25Z obrien $");
   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/acpi.h>
   51 #include <dev/acpica/acpivar.h>
   52 
   53 #include "acpi_wakecode.h"
   54 
   55 #ifndef _SYS_CDEFS_H_
   56 #error this file needs sys/cdefs.h as a prerequisite
   57 #endif
   58 
   59 extern uint32_t acpi_reset_video;
   60 extern void     initializecpu(void);
   61 
   62 static struct region_descriptor r_idt, r_gdt, *p_gdt;
   63 static uint16_t         r_ldt;
   64 
   65 static uint32_t         r_eax, r_ebx, r_ecx, r_edx, r_ebp, r_esi, r_edi,
   66                         r_efl, r_cr0, r_cr2, r_cr3, r_cr4, ret_addr;
   67 
   68 static uint16_t         r_cs, r_ds, r_es, r_fs, r_gs, r_ss, r_tr;
   69 static uint32_t         r_esp = 0;
   70 
   71 static void             acpi_printcpu(void);
   72 static void             acpi_realmodeinst(void *arg, bus_dma_segment_t *segs,
   73                                           int nsegs, int error);
   74 static void             acpi_alloc_wakeup_handler(void);
   75 
   76 /* XXX shut gcc up */
   77 extern int              acpi_savecpu(void);
   78 extern int              acpi_restorecpu(void);
   79 
   80 #ifdef __GNUCLIKE_ASM
   81 __asm__("                               \n\
   82         .text                           \n\
   83         .p2align 2, 0x90                \n\
   84         .type acpi_restorecpu, @function\n\
   85 acpi_restorecpu:                        \n\
   86         .align 4                        \n\
   87         movl    r_eax,%eax              \n\
   88         movl    r_ebx,%ebx              \n\
   89         movl    r_ecx,%ecx              \n\
   90         movl    r_edx,%edx              \n\
   91         movl    r_ebp,%ebp              \n\
   92         movl    r_esi,%esi              \n\
   93         movl    r_edi,%edi              \n\
   94         movl    r_esp,%esp              \n\
   95                                         \n\
   96         pushl   r_efl                   \n\
   97         popfl                           \n\
   98                                         \n\
   99         movl    ret_addr,%eax           \n\
  100         movl    %eax,(%esp)             \n\
  101         xorl    %eax,%eax               \n\
  102         ret                             \n\
  103                                         \n\
  104         .text                           \n\
  105         .p2align 2, 0x90                \n\
  106         .type acpi_savecpu, @function   \n\
  107 acpi_savecpu:                           \n\
  108         movw    %cs,r_cs                \n\
  109         movw    %ds,r_ds                \n\
  110         movw    %es,r_es                \n\
  111         movw    %fs,r_fs                \n\
  112         movw    %gs,r_gs                \n\
  113         movw    %ss,r_ss                \n\
  114                                         \n\
  115         movl    %eax,r_eax              \n\
  116         movl    %ebx,r_ebx              \n\
  117         movl    %ecx,r_ecx              \n\
  118         movl    %edx,r_edx              \n\
  119         movl    %ebp,r_ebp              \n\
  120         movl    %esi,r_esi              \n\
  121         movl    %edi,r_edi              \n\
  122                                         \n\
  123         movl    %cr0,%eax               \n\
  124         movl    %eax,r_cr0              \n\
  125         movl    %cr2,%eax               \n\
  126         movl    %eax,r_cr2              \n\
  127         movl    %cr3,%eax               \n\
  128         movl    %eax,r_cr3              \n\
  129         movl    %cr4,%eax               \n\
  130         movl    %eax,r_cr4              \n\
  131                                         \n\
  132         pushfl                          \n\
  133         popl    r_efl                   \n\
  134                                         \n\
  135         movl    %esp,r_esp              \n\
  136                                         \n\
  137         sgdt    r_gdt                   \n\
  138         sidt    r_idt                   \n\
  139         sldt    r_ldt                   \n\
  140         str     r_tr                    \n\
  141                                         \n\
  142         movl    (%esp),%eax             \n\
  143         movl    %eax,ret_addr           \n\
  144         movl    $1,%eax                 \n\
  145         ret                             \n\
  146 ");
  147 #endif /* __GNUCLIKE_ASM */
  148 
  149 static void
  150 acpi_printcpu(void)
  151 {
  152         printf("======== acpi_printcpu() debug dump ========\n");
  153         printf("gdt[%04x:%08x] idt[%04x:%08x] ldt[%04x] tr[%04x] efl[%08x]\n",
  154                 r_gdt.rd_limit, r_gdt.rd_base, r_idt.rd_limit, r_idt.rd_base,
  155                 r_ldt, r_tr, r_efl);
  156         printf("eax[%08x] ebx[%08x] ecx[%08x] edx[%08x]\n",
  157                 r_eax, r_ebx, r_ecx, r_edx);
  158         printf("esi[%08x] edi[%08x] ebp[%08x] esp[%08x]\n",
  159                 r_esi, r_edi, r_ebp, r_esp);
  160         printf("cr0[%08x] cr2[%08x] cr3[%08x] cr4[%08x]\n",
  161                 r_cr0, r_cr2, r_cr3, r_cr4);
  162         printf("cs[%04x] ds[%04x] es[%04x] fs[%04x] gs[%04x] ss[%04x]\n",
  163                 r_cs, r_ds, r_es, r_fs, r_gs, r_ss);
  164 }
  165 
  166 #define WAKECODE_FIXUP(offset, type, val) do    {               \
  167         type    *addr;                                          \
  168         addr = (type *)(sc->acpi_wakeaddr + offset);            \
  169         *addr = val;                                            \
  170 } while (0)
  171 
  172 #define WAKECODE_BCOPY(offset, type, val) do    {               \
  173         void    *addr;                                          \
  174         addr = (void *)(sc->acpi_wakeaddr + offset);            \
  175         bcopy(&(val), addr, sizeof(type));                      \
  176 } while (0)
  177 
  178 int
  179 acpi_sleep_machdep(struct acpi_softc *sc, int state)
  180 {
  181         ACPI_STATUS             status;
  182         struct pmap             *pm;
  183         vm_page_t               page;
  184         int                     ret;
  185         uint32_t                cr3;
  186         u_long                  ef;
  187         struct proc             *p;
  188 
  189         ret = 0;
  190         if (sc->acpi_wakeaddr == 0)
  191                 return (0);
  192 
  193         AcpiSetFirmwareWakingVector(sc->acpi_wakephys);
  194 
  195         ef = read_eflags();
  196 
  197         /* Create Identity Mapping */
  198         if ((p = curproc) == NULL)
  199                 p = &proc0;
  200         pm = vmspace_pmap(p->p_vmspace);
  201         cr3 = rcr3();
  202 #ifdef PAE
  203         load_cr3(vtophys(pm->pm_pdpt));
  204 #else
  205         load_cr3(vtophys(pm->pm_pdir));
  206 #endif
  207 
  208         page = PHYS_TO_VM_PAGE(sc->acpi_wakephys);
  209         pmap_enter(pm, sc->acpi_wakephys, page,
  210                    VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE, 1);
  211 
  212         ret_addr = 0;
  213         ACPI_DISABLE_IRQS();
  214         if (acpi_savecpu()) {
  215                 /* Execute Sleep */
  216                 intr_suspend();
  217 
  218                 p_gdt = (struct region_descriptor *)
  219                                 (sc->acpi_wakeaddr + physical_gdt);
  220                 p_gdt->rd_limit = r_gdt.rd_limit;
  221                 p_gdt->rd_base = vtophys(r_gdt.rd_base);
  222 
  223                 WAKECODE_FIXUP(physical_esp, uint32_t, vtophys(r_esp));
  224                 WAKECODE_FIXUP(previous_cr0, uint32_t, r_cr0);
  225                 WAKECODE_FIXUP(previous_cr2, uint32_t, r_cr2);
  226                 WAKECODE_FIXUP(previous_cr3, uint32_t, r_cr3);
  227                 WAKECODE_FIXUP(previous_cr4, uint32_t, r_cr4);
  228 
  229                 WAKECODE_FIXUP(reset_video, uint32_t, acpi_reset_video);
  230 
  231                 WAKECODE_FIXUP(previous_tr,  uint16_t, r_tr);
  232                 WAKECODE_BCOPY(previous_gdt, struct region_descriptor, r_gdt);
  233                 WAKECODE_FIXUP(previous_ldt, uint16_t, r_ldt);
  234                 WAKECODE_BCOPY(previous_idt, struct region_descriptor, r_idt);
  235 
  236                 WAKECODE_FIXUP(where_to_recover, void *, acpi_restorecpu);
  237 
  238                 WAKECODE_FIXUP(previous_ds,  uint16_t, r_ds);
  239                 WAKECODE_FIXUP(previous_es,  uint16_t, r_es);
  240                 WAKECODE_FIXUP(previous_fs,  uint16_t, r_fs);
  241                 WAKECODE_FIXUP(previous_gs,  uint16_t, r_gs);
  242                 WAKECODE_FIXUP(previous_ss,  uint16_t, r_ss);
  243 
  244                 if (bootverbose)
  245                         acpi_printcpu();
  246 
  247                 /* Call ACPICA to enter the desired sleep state */
  248                 if (state == ACPI_STATE_S4 && sc->acpi_s4bios)
  249                         status = AcpiEnterSleepStateS4bios();
  250                 else
  251                         status = AcpiEnterSleepState(state);
  252 
  253                 if (status != AE_OK) {
  254                         device_printf(sc->acpi_dev,
  255                                 "AcpiEnterSleepState failed - %s\n",
  256                                 AcpiFormatException(status));
  257                         ret = -1;
  258                         goto out;
  259                 }
  260 
  261                 for (;;) ;
  262         } else {
  263                 /* Execute Wakeup */
  264                 intr_resume();
  265 
  266                 if (bootverbose) {
  267                         acpi_savecpu();
  268                         acpi_printcpu();
  269                 }
  270         }
  271 
  272 out:
  273         pmap_remove(pm, sc->acpi_wakephys, sc->acpi_wakephys + PAGE_SIZE);
  274         load_cr3(cr3);
  275         write_eflags(ef);
  276 
  277         return (ret);
  278 }
  279 
  280 static bus_dma_tag_t    acpi_waketag;
  281 static bus_dmamap_t     acpi_wakemap;
  282 static vm_offset_t      acpi_wakeaddr = 0;
  283 
  284 static void
  285 acpi_alloc_wakeup_handler(void)
  286 {
  287         void *wakeaddr;
  288 
  289         if (!cold)
  290                 return;
  291 
  292         if (bus_dma_tag_create(/* parent */ NULL, /* alignment */ 2, 0,
  293                                /* lowaddr below 1MB */ 0x9ffff,
  294                                /* highaddr */ BUS_SPACE_MAXADDR, NULL, NULL,
  295                                 PAGE_SIZE, 1, PAGE_SIZE, 0, busdma_lock_mutex,
  296                                 &Giant, &acpi_waketag) != 0) {
  297                 printf("acpi_alloc_wakeup_handler: can't create wake tag\n");
  298                 return;
  299         }
  300         if (bus_dmamem_alloc(acpi_waketag, &wakeaddr,
  301                              BUS_DMA_NOWAIT, &acpi_wakemap)) {
  302                 printf("acpi_alloc_wakeup_handler: can't alloc wake memory\n");
  303                 return;
  304         }
  305         acpi_wakeaddr = (vm_offset_t)wakeaddr;
  306 }
  307 
  308 SYSINIT(acpiwakeup, SI_SUB_KMEM, SI_ORDER_ANY, acpi_alloc_wakeup_handler, 0)
  309 
  310 static void
  311 acpi_realmodeinst(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
  312 {
  313         struct acpi_softc       *sc = arg;
  314         uint32_t                *addr;
  315 
  316         addr = (uint32_t *)&wakecode[wakeup_sw32 + 2];
  317         *addr = segs[0].ds_addr + wakeup_32;
  318         bcopy(wakecode, (void *)sc->acpi_wakeaddr, sizeof(wakecode));
  319         sc->acpi_wakephys = segs[0].ds_addr;
  320 }
  321 
  322 void
  323 acpi_install_wakeup_handler(struct acpi_softc *sc)
  324 {
  325         if (acpi_wakeaddr == 0)
  326                 return;
  327 
  328         sc->acpi_waketag = acpi_waketag;
  329         sc->acpi_wakeaddr = acpi_wakeaddr;
  330         sc->acpi_wakemap = acpi_wakemap;
  331 
  332         bus_dmamap_load(sc->acpi_waketag, sc->acpi_wakemap,
  333                         (void *)sc->acpi_wakeaddr, PAGE_SIZE,
  334                         acpi_realmodeinst, sc, 0);
  335 }

Cache object: 8c39087c963b47fb047d172650e76fa6


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