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: src/sys/i386/acpica/acpi_wakeup.c,v 1.37.2.1 2004/08/23 05:14:18 njl Exp $");
   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 "acpi.h"
   51 #include <dev/acpica/acpivar.h>
   52 
   53 #include "acpi_wakecode.h"
   54 
   55 extern uint32_t acpi_reset_video;
   56 extern void     initializecpu(void);
   57 
   58 static struct region_descriptor r_idt, r_gdt, *p_gdt;
   59 static uint16_t         r_ldt;
   60 
   61 static uint32_t         r_eax, r_ebx, r_ecx, r_edx, r_ebp, r_esi, r_edi,
   62                         r_efl, r_cr0, r_cr2, r_cr3, r_cr4, ret_addr;
   63 
   64 static uint16_t         r_cs, r_ds, r_es, r_fs, r_gs, r_ss, r_tr;
   65 static uint32_t         r_esp = 0;
   66 
   67 static void             acpi_printcpu(void);
   68 static void             acpi_realmodeinst(void *arg, bus_dma_segment_t *segs,
   69                                           int nsegs, int error);
   70 static void             acpi_alloc_wakeup_handler(void);
   71 
   72 /* XXX shut gcc up */
   73 extern int              acpi_savecpu(void);
   74 extern int              acpi_restorecpu(void);
   75 
   76 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
   77 __asm__("                               \n\
   78         .text                           \n\
   79         .p2align 2, 0x90                \n\
   80         .type acpi_restorecpu, @function\n\
   81 acpi_restorecpu:                        \n\
   82         .align 4                        \n\
   83         movl    r_eax,%eax              \n\
   84         movl    r_ebx,%ebx              \n\
   85         movl    r_ecx,%ecx              \n\
   86         movl    r_edx,%edx              \n\
   87         movl    r_ebp,%ebp              \n\
   88         movl    r_esi,%esi              \n\
   89         movl    r_edi,%edi              \n\
   90         movl    r_esp,%esp              \n\
   91                                         \n\
   92         pushl   r_efl                   \n\
   93         popfl                           \n\
   94                                         \n\
   95         movl    ret_addr,%eax           \n\
   96         movl    %eax,(%esp)             \n\
   97         xorl    %eax,%eax               \n\
   98         ret                             \n\
   99                                         \n\
  100         .text                           \n\
  101         .p2align 2, 0x90                \n\
  102         .type acpi_savecpu, @function   \n\
  103 acpi_savecpu:                           \n\
  104         movw    %cs,r_cs                \n\
  105         movw    %ds,r_ds                \n\
  106         movw    %es,r_es                \n\
  107         movw    %fs,r_fs                \n\
  108         movw    %gs,r_gs                \n\
  109         movw    %ss,r_ss                \n\
  110                                         \n\
  111         movl    %eax,r_eax              \n\
  112         movl    %ebx,r_ebx              \n\
  113         movl    %ecx,r_ecx              \n\
  114         movl    %edx,r_edx              \n\
  115         movl    %ebp,r_ebp              \n\
  116         movl    %esi,r_esi              \n\
  117         movl    %edi,r_edi              \n\
  118                                         \n\
  119         movl    %cr0,%eax               \n\
  120         movl    %eax,r_cr0              \n\
  121         movl    %cr2,%eax               \n\
  122         movl    %eax,r_cr2              \n\
  123         movl    %cr3,%eax               \n\
  124         movl    %eax,r_cr3              \n\
  125         movl    %cr4,%eax               \n\
  126         movl    %eax,r_cr4              \n\
  127                                         \n\
  128         pushfl                          \n\
  129         popl    r_efl                   \n\
  130                                         \n\
  131         movl    %esp,r_esp              \n\
  132                                         \n\
  133         sgdt    r_gdt                   \n\
  134         sidt    r_idt                   \n\
  135         sldt    r_ldt                   \n\
  136         str     r_tr                    \n\
  137                                         \n\
  138         movl    (%esp),%eax             \n\
  139         movl    %eax,ret_addr           \n\
  140         movl    $1,%eax                 \n\
  141         ret                             \n\
  142 ");
  143 #endif /* __GNUC__ || __INTEL_COMPILER */
  144 
  145 static void
  146 acpi_printcpu(void)
  147 {
  148         printf("======== acpi_printcpu() debug dump ========\n");
  149         printf("gdt[%04x:%08x] idt[%04x:%08x] ldt[%04x] tr[%04x] efl[%08x]\n",
  150                 r_gdt.rd_limit, r_gdt.rd_base, r_idt.rd_limit, r_idt.rd_base,
  151                 r_ldt, r_tr, r_efl);
  152         printf("eax[%08x] ebx[%08x] ecx[%08x] edx[%08x]\n",
  153                 r_eax, r_ebx, r_ecx, r_edx);
  154         printf("esi[%08x] edi[%08x] ebp[%08x] esp[%08x]\n",
  155                 r_esi, r_edi, r_ebp, r_esp);
  156         printf("cr0[%08x] cr2[%08x] cr3[%08x] cr4[%08x]\n",
  157                 r_cr0, r_cr2, r_cr3, r_cr4);
  158         printf("cs[%04x] ds[%04x] es[%04x] fs[%04x] gs[%04x] ss[%04x]\n",
  159                 r_cs, r_ds, r_es, r_fs, r_gs, r_ss);
  160 }
  161 
  162 #define WAKECODE_FIXUP(offset, type, val) do    {               \
  163         type    *addr;                                          \
  164         addr = (type *)(sc->acpi_wakeaddr + offset);            \
  165         *addr = val;                                            \
  166 } while (0)
  167 
  168 #define WAKECODE_BCOPY(offset, type, val) do    {               \
  169         void    *addr;                                          \
  170         addr = (void *)(sc->acpi_wakeaddr + offset);            \
  171         bcopy(&(val), addr, sizeof(type));                      \
  172 } while (0)
  173 
  174 int
  175 acpi_sleep_machdep(struct acpi_softc *sc, int state)
  176 {
  177         ACPI_STATUS             status;
  178         struct pmap             *pm;
  179         vm_page_t               page;
  180         int                     ret;
  181         uint32_t                cr3;
  182         u_long                  ef;
  183         struct proc             *p;
  184 
  185         ret = 0;
  186         if (sc->acpi_wakeaddr == 0)
  187                 return (0);
  188 
  189         AcpiSetFirmwareWakingVector(sc->acpi_wakephys);
  190 
  191         ef = read_eflags();
  192 
  193         /* Create Identity Mapping */
  194         if ((p = curproc) == NULL)
  195                 p = &proc0;
  196         pm = vmspace_pmap(p->p_vmspace);
  197         cr3 = rcr3();
  198 #ifdef PAE
  199         load_cr3(vtophys(pm->pm_pdpt));
  200 #else
  201         load_cr3(vtophys(pm->pm_pdir));
  202 #endif
  203 
  204         page = PHYS_TO_VM_PAGE(sc->acpi_wakephys);
  205         pmap_enter(pm, sc->acpi_wakephys, page,
  206                    VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE, 1);
  207 
  208         ret_addr = 0;
  209         ACPI_DISABLE_IRQS();
  210         if (acpi_savecpu()) {
  211                 /* Execute Sleep */
  212                 intr_suspend();
  213 
  214                 p_gdt = (struct region_descriptor *)
  215                                 (sc->acpi_wakeaddr + physical_gdt);
  216                 p_gdt->rd_limit = r_gdt.rd_limit;
  217                 p_gdt->rd_base = vtophys(r_gdt.rd_base);
  218 
  219                 WAKECODE_FIXUP(physical_esp, uint32_t, vtophys(r_esp));
  220                 WAKECODE_FIXUP(previous_cr0, uint32_t, r_cr0);
  221                 WAKECODE_FIXUP(previous_cr2, uint32_t, r_cr2);
  222                 WAKECODE_FIXUP(previous_cr3, uint32_t, r_cr3);
  223                 WAKECODE_FIXUP(previous_cr4, uint32_t, r_cr4);
  224 
  225                 WAKECODE_FIXUP(reset_video, uint32_t, acpi_reset_video);
  226 
  227                 WAKECODE_FIXUP(previous_tr,  uint16_t, r_tr);
  228                 WAKECODE_BCOPY(previous_gdt, struct region_descriptor, r_gdt);
  229                 WAKECODE_FIXUP(previous_ldt, uint16_t, r_ldt);
  230                 WAKECODE_BCOPY(previous_idt, struct region_descriptor, r_idt);
  231 
  232                 WAKECODE_FIXUP(where_to_recover, void *, acpi_restorecpu);
  233 
  234                 WAKECODE_FIXUP(previous_ds,  uint16_t, r_ds);
  235                 WAKECODE_FIXUP(previous_es,  uint16_t, r_es);
  236                 WAKECODE_FIXUP(previous_fs,  uint16_t, r_fs);
  237                 WAKECODE_FIXUP(previous_gs,  uint16_t, r_gs);
  238                 WAKECODE_FIXUP(previous_ss,  uint16_t, r_ss);
  239 
  240                 if (bootverbose)
  241                         acpi_printcpu();
  242 
  243                 /* Call ACPICA to enter the desired sleep state */
  244                 if (state == ACPI_STATE_S4 && sc->acpi_s4bios)
  245                         status = AcpiEnterSleepStateS4bios();
  246                 else
  247                         status = AcpiEnterSleepState(state);
  248 
  249                 if (status != AE_OK) {
  250                         device_printf(sc->acpi_dev,
  251                                 "AcpiEnterSleepState failed - %s\n",
  252                                 AcpiFormatException(status));
  253                         ret = -1;
  254                         goto out;
  255                 }
  256 
  257                 for (;;) ;
  258         } else {
  259                 /* Execute Wakeup */
  260                 intr_resume();
  261 
  262                 if (bootverbose) {
  263                         acpi_savecpu();
  264                         acpi_printcpu();
  265                 }
  266         }
  267 
  268 out:
  269         pmap_remove(pm, sc->acpi_wakephys, sc->acpi_wakephys + PAGE_SIZE);
  270         load_cr3(cr3);
  271         write_eflags(ef);
  272 
  273         return (ret);
  274 }
  275 
  276 static bus_dma_tag_t    acpi_waketag;
  277 static bus_dmamap_t     acpi_wakemap;
  278 static vm_offset_t      acpi_wakeaddr = 0;
  279 
  280 static void
  281 acpi_alloc_wakeup_handler(void)
  282 {
  283         void *wakeaddr;
  284 
  285         if (!cold)
  286                 return;
  287 
  288         if (bus_dma_tag_create(/* parent */ NULL, /* alignment */ 2, 0,
  289                                /* lowaddr below 1MB */ 0x9ffff,
  290                                /* highaddr */ BUS_SPACE_MAXADDR, NULL, NULL,
  291                                 PAGE_SIZE, 1, PAGE_SIZE, 0, busdma_lock_mutex,
  292                                 &Giant, &acpi_waketag) != 0) {
  293                 printf("acpi_alloc_wakeup_handler: can't create wake tag\n");
  294                 return;
  295         }
  296         if (bus_dmamem_alloc(acpi_waketag, &wakeaddr,
  297                              BUS_DMA_NOWAIT, &acpi_wakemap)) {
  298                 printf("acpi_alloc_wakeup_handler: can't alloc wake memory\n");
  299                 return;
  300         }
  301         acpi_wakeaddr = (vm_offset_t)wakeaddr;
  302 }
  303 
  304 SYSINIT(acpiwakeup, SI_SUB_KMEM, SI_ORDER_ANY, acpi_alloc_wakeup_handler, 0)
  305 
  306 static void
  307 acpi_realmodeinst(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
  308 {
  309         struct acpi_softc       *sc = arg;
  310         uint32_t                *addr;
  311 
  312         addr = (uint32_t *)&wakecode[wakeup_sw32 + 2];
  313         *addr = segs[0].ds_addr + wakeup_32;
  314         bcopy(wakecode, (void *)sc->acpi_wakeaddr, sizeof(wakecode));
  315         sc->acpi_wakephys = segs[0].ds_addr;
  316 }
  317 
  318 void
  319 acpi_install_wakeup_handler(struct acpi_softc *sc)
  320 {
  321         if (acpi_wakeaddr == 0)
  322                 return;
  323 
  324         sc->acpi_waketag = acpi_waketag;
  325         sc->acpi_wakeaddr = acpi_wakeaddr;
  326         sc->acpi_wakemap = acpi_wakemap;
  327 
  328         bus_dmamap_load(sc->acpi_waketag, sc->acpi_wakemap,
  329                         (void *)sc->acpi_wakeaddr, PAGE_SIZE,
  330                         acpi_realmodeinst, sc, 0);
  331 }

Cache object: b6da32ffdf1429d46d0272f97d2af17c


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