acpi_switch.S

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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  * Copyright (c) 2008-2009 Jung-uk Kim <jkim@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/8.0/sys/amd64/acpica/acpi_switch.S 190636 2009-04-02 01:46:57Z jkim $
   29  */
   30 
   31 #include <machine/asmacros.h>
   32 #include <machine/specialreg.h>
   33 
   34 #include "acpi_wakedata.h"
   35 #include "assym.s"
   36 
   37 #define WAKEUP_DECL(member)     \
   38     .set WAKEUP_ ## member, wakeup_ ## member - wakeup_ctx
   39 
   40         WAKEUP_DECL(xpcb)
   41         WAKEUP_DECL(gdt)
   42         WAKEUP_DECL(efer)
   43         WAKEUP_DECL(pat)
   44         WAKEUP_DECL(star)
   45         WAKEUP_DECL(lstar)
   46         WAKEUP_DECL(cstar)
   47         WAKEUP_DECL(sfmask)
   48         WAKEUP_DECL(cpu)
   49 
   50 #define WAKEUP_CTX(member)      WAKEUP_ ## member (%rdi)
   51 #define WAKEUP_PCB(member)      PCB_ ## member(%r11)
   52 #define WAKEUP_XPCB(member)     XPCB_ ## member(%r11)
   53 
   54 ENTRY(acpi_restorecpu)
   55         /* Switch to KPML4phys. */
   56         movq    %rsi, %rax
   57         movq    %rax, %cr3
   58 
   59         /* Restore GDT. */
   60         lgdt    WAKEUP_CTX(gdt)
   61         jmp     1f
   62 1:
   63 
   64         /* Fetch PCB. */
   65         movq    WAKEUP_CTX(xpcb), %r11
   66 
   67         /* Force kernel segment registers. */
   68         movl    $KDSEL, %eax
   69         movw    %ax, %ds
   70         movw    %ax, %es
   71         movw    %ax, %ss
   72         movl    $KUF32SEL, %eax
   73         movw    %ax, %fs
   74         movl    $KUG32SEL, %eax
   75         movw    %ax, %gs
   76 
   77         movl    $MSR_FSBASE, %ecx
   78         movl    WAKEUP_PCB(FSBASE), %eax
   79         movl    4 + WAKEUP_PCB(FSBASE), %edx
   80         wrmsr
   81         movl    $MSR_GSBASE, %ecx
   82         movl    WAKEUP_PCB(GSBASE), %eax
   83         movl    4 + WAKEUP_PCB(GSBASE), %edx
   84         wrmsr
   85         movl    $MSR_KGSBASE, %ecx
   86         movl    WAKEUP_XPCB(KGSBASE), %eax
   87         movl    4 + WAKEUP_XPCB(KGSBASE), %edx
   88         wrmsr
   89 
   90         /* Restore EFER. */
   91         movl    $MSR_EFER, %ecx
   92         movl    WAKEUP_CTX(efer), %eax
   93         wrmsr
   94 
   95         /* Restore PAT. */
   96         movl    $MSR_PAT, %ecx
   97         movl    WAKEUP_CTX(pat), %eax
   98         movl    4 + WAKEUP_CTX(pat), %edx
   99         wrmsr
  100 
  101         /* Restore fast syscall stuff. */
  102         movl    $MSR_STAR, %ecx
  103         movl    WAKEUP_CTX(star), %eax
  104         movl    4 + WAKEUP_CTX(star), %edx
  105         wrmsr
  106         movl    $MSR_LSTAR, %ecx
  107         movl    WAKEUP_CTX(lstar), %eax
  108         movl    4 + WAKEUP_CTX(lstar), %edx
  109         wrmsr
  110         movl    $MSR_CSTAR, %ecx
  111         movl    WAKEUP_CTX(cstar), %eax
  112         movl    4 + WAKEUP_CTX(cstar), %edx
  113         wrmsr
  114         movl    $MSR_SF_MASK, %ecx
  115         movl    WAKEUP_CTX(sfmask), %eax
  116         wrmsr
  117 
  118         /* Restore CR0, CR2 and CR4. */
  119         movq    WAKEUP_XPCB(CR0), %rax
  120         movq    %rax, %cr0
  121         movq    WAKEUP_XPCB(CR2), %rax
  122         movq    %rax, %cr2
  123         movq    WAKEUP_XPCB(CR4), %rax
  124         movq    %rax, %cr4
  125 
  126         /* Restore descriptor tables. */
  127         lidt    WAKEUP_XPCB(IDT)
  128         lldt    WAKEUP_XPCB(LDT)
  129 
  130 #define SDT_SYSTSS      9
  131 #define SDT_SYSBSY      11
  132 
  133         /* Clear "task busy" bit and reload TR. */
  134         movq    PCPU(TSS), %rax
  135         andb    $(~SDT_SYSBSY | SDT_SYSTSS), 5(%rax)
  136         movw    WAKEUP_XPCB(TR), %ax
  137         ltr     %ax
  138 
  139 #undef  SDT_SYSTSS
  140 #undef  SDT_SYSBSY
  141 
  142         /* Restore other callee saved registers. */
  143         movq    WAKEUP_PCB(R15), %r15
  144         movq    WAKEUP_PCB(R14), %r14
  145         movq    WAKEUP_PCB(R13), %r13
  146         movq    WAKEUP_PCB(R12), %r12
  147         movq    WAKEUP_PCB(RBP), %rbp
  148         movq    WAKEUP_PCB(RSP), %rsp
  149         movq    WAKEUP_PCB(RBX), %rbx
  150 
  151         /* Restore debug registers. */
  152         movq    WAKEUP_PCB(DR0), %rax
  153         movq    %rax, %dr0
  154         movq    WAKEUP_PCB(DR1), %rax
  155         movq    %rax, %dr1
  156         movq    WAKEUP_PCB(DR2), %rax
  157         movq    %rax, %dr2
  158         movq    WAKEUP_PCB(DR3), %rax
  159         movq    %rax, %dr3
  160         movq    WAKEUP_PCB(DR6), %rax
  161         movq    %rax, %dr6
  162         movq    WAKEUP_PCB(DR7), %rax
  163         movq    %rax, %dr7
  164 
  165         /* Restore return address. */
  166         movq    WAKEUP_PCB(RIP), %rax
  167         movq    %rax, (%rsp)
  168 
  169         /* Indicate the CPU is resumed. */
  170         xorl    %eax, %eax
  171         movl    %eax, WAKEUP_CTX(cpu)
  172 
  173         ret
  174 END(acpi_restorecpu)
  175 
  176 ENTRY(acpi_savecpu)
  177         /* Fetch XPCB and save CPU context. */
  178         movq    %rdi, %r10
  179         call    savectx2
  180         movq    %r10, %r11
  181 
  182         /* Patch caller's return address and stack pointer. */
  183         movq    (%rsp), %rax
  184         movq    %rax, WAKEUP_PCB(RIP)
  185         movq    %rsp, %rax
  186         movq    %rax, WAKEUP_PCB(RSP)
  187 
  188         movl    $1, %eax
  189         ret
  190 END(acpi_savecpu)

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