Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/acpica/acpi_switch.S
Version:
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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) 2008-2010 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/8.4/sys/amd64/acpica/acpi_switch.S 237009 2012-06-13 15:25:52Z jhb $ 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_CTX(member) wakeup_ ## member - wakeup_ctx(%rsi) 38 39 ENTRY(acpi_restorecpu) 40 /* Switch to KPML4phys. */ 41 movq %rdi, %cr3 42 43 /* Restore GDT. */ 44 lgdt WAKEUP_CTX(gdt) 45 jmp 1f 46 1: 47 48 /* Fetch PCB. */ 49 movq WAKEUP_CTX(pcb), %rdi 50 51 /* Force kernel segment registers. */ 52 movl $KDSEL, %eax 53 movw %ax, %ds 54 movw %ax, %es 55 movw %ax, %ss 56 movl $KUF32SEL, %eax 57 movw %ax, %fs 58 movl $KUG32SEL, %eax 59 movw %ax, %gs 60 61 movl $MSR_FSBASE, %ecx 62 movl PCB_FSBASE(%rdi), %eax 63 movl 4 + PCB_FSBASE(%rdi), %edx 64 wrmsr 65 movl $MSR_GSBASE, %ecx 66 movl PCB_GSBASE(%rdi), %eax 67 movl 4 + PCB_GSBASE(%rdi), %edx 68 wrmsr 69 movl $MSR_KGSBASE, %ecx 70 movl PCB_KGSBASE(%rdi), %eax 71 movl 4 + PCB_KGSBASE(%rdi), %edx 72 wrmsr 73 74 /* Restore EFER. */ 75 movl $MSR_EFER, %ecx 76 movl WAKEUP_CTX(efer), %eax 77 wrmsr 78 79 /* Restore fast syscall stuff. */ 80 movl $MSR_STAR, %ecx 81 movl WAKEUP_CTX(star), %eax 82 movl 4 + WAKEUP_CTX(star), %edx 83 wrmsr 84 movl $MSR_LSTAR, %ecx 85 movl WAKEUP_CTX(lstar), %eax 86 movl 4 + WAKEUP_CTX(lstar), %edx 87 wrmsr 88 movl $MSR_CSTAR, %ecx 89 movl WAKEUP_CTX(cstar), %eax 90 movl 4 + WAKEUP_CTX(cstar), %edx 91 wrmsr 92 movl $MSR_SF_MASK, %ecx 93 movl WAKEUP_CTX(sfmask), %eax 94 wrmsr 95 96 /* Restore CR0 except for FPU mode. */ 97 movq PCB_CR0(%rdi), %rax 98 movq %rax, %rcx 99 andq $~(CR0_EM | CR0_TS), %rax 100 movq %rax, %cr0 101 102 /* Restore CR2 and CR4. */ 103 movq PCB_CR2(%rdi), %rax 104 movq %rax, %cr2 105 movq PCB_CR4(%rdi), %rax 106 movq %rax, %cr4 107 108 /* Restore descriptor tables. */ 109 lidt PCB_IDT(%rdi) 110 lldt PCB_LDT(%rdi) 111 112 #define SDT_SYSTSS 9 113 #define SDT_SYSBSY 11 114 115 /* Clear "task busy" bit and reload TR. */ 116 movq PCPU(TSS), %rax 117 andb $(~SDT_SYSBSY | SDT_SYSTSS), 5(%rax) 118 movw PCB_TR(%rdi), %ax 119 ltr %ax 120 121 #undef SDT_SYSTSS 122 #undef SDT_SYSBSY 123 124 /* Restore other callee saved registers. */ 125 movq PCB_R15(%rdi), %r15 126 movq PCB_R14(%rdi), %r14 127 movq PCB_R13(%rdi), %r13 128 movq PCB_R12(%rdi), %r12 129 movq PCB_RBP(%rdi), %rbp 130 movq PCB_RSP(%rdi), %rsp 131 movq PCB_RBX(%rdi), %rbx 132 133 /* Restore debug registers. */ 134 movq PCB_DR0(%rdi), %rax 135 movq %rax, %dr0 136 movq PCB_DR1(%rdi), %rax 137 movq %rax, %dr1 138 movq PCB_DR2(%rdi), %rax 139 movq %rax, %dr2 140 movq PCB_DR3(%rdi), %rax 141 movq %rax, %dr3 142 movq PCB_DR6(%rdi), %rax 143 movq %rax, %dr6 144 movq PCB_DR7(%rdi), %rax 145 movq %rax, %dr7 146 147 /* Restore FPU state. */ 148 fninit 149 movq WAKEUP_CTX(fpusave),%rdi 150 cmpl $0,use_xsave 151 jne 1f 152 fxrstor (%rdi) 153 jmp 2f 154 1: movl xsave_mask,%eax 155 movl xsave_mask+4,%edx 156 /* xrstor (%rdi) */ 157 .byte 0x0f,0xae,0x2f 158 2: 159 160 /* Reload CR0. */ 161 movq %rcx, %cr0 162 163 movq WAKEUP_CTX(pcb),%rdi 164 165 /* Restore return address. */ 166 movq PCB_RIP(%rdi), %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)
Cache object: b53046253e956f00ae00f64f072b99af
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