diff options
Diffstat (limited to 'sys/amd64/acpica/acpi_switch.S')
| -rw-r--r-- | sys/amd64/acpica/acpi_switch.S | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/sys/amd64/acpica/acpi_switch.S b/sys/amd64/acpica/acpi_switch.S new file mode 100644 index 0000000..d4f732a --- /dev/null +++ b/sys/amd64/acpica/acpi_switch.S @@ -0,0 +1,177 @@ +/*- + * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org> + * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> + * Copyright (c) 2008-2009 Jung-uk Kim <jkim@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#include <machine/asmacros.h> +#include <machine/specialreg.h> + +#include "acpi_wakedata.h" +#include "assym.s" + +#define WAKEUP_DECL(member) \ + .set WAKEUP_ ## member, wakeup_ ## member - wakeup_ctx + + WAKEUP_DECL(xpcb) + WAKEUP_DECL(gdt) + WAKEUP_DECL(efer) + WAKEUP_DECL(pat) + WAKEUP_DECL(star) + WAKEUP_DECL(lstar) + WAKEUP_DECL(cstar) + WAKEUP_DECL(sfmask) + WAKEUP_DECL(cpu) + +#define WAKEUP_CTX(member) WAKEUP_ ## member (%rdi) +#define WAKEUP_PCB(member) PCB_ ## member(%r11) +#define WAKEUP_XPCB(member) XPCB_ ## member(%r11) + +ENTRY(acpi_restorecpu) + /* Switch to KPML4phys. */ + movq %rsi, %rax + movq %rax, %cr3 + + /* Restore GDT. */ + lgdt WAKEUP_CTX(gdt) + jmp 1f +1: + + /* Fetch PCB. */ + movq WAKEUP_CTX(xpcb), %r11 + + /* Restore segment registers. */ + mov WAKEUP_PCB(DS), %ds + mov WAKEUP_PCB(ES), %es + mov WAKEUP_XPCB(SS), %ss + mov WAKEUP_PCB(FS), %fs + mov WAKEUP_PCB(GS), %gs + + movl $MSR_FSBASE, %ecx + movl WAKEUP_PCB(FSBASE), %eax + movl 4 + WAKEUP_PCB(FSBASE), %edx + wrmsr + movl $MSR_GSBASE, %ecx + movl WAKEUP_PCB(GSBASE), %eax + movl 4 + WAKEUP_PCB(GSBASE), %edx + wrmsr + movl $MSR_KGSBASE, %ecx + movl WAKEUP_XPCB(KGSBASE), %eax + movl 4 + WAKEUP_XPCB(KGSBASE), %edx + wrmsr + + /* Restore EFER. */ + movl $MSR_EFER, %ecx + movl WAKEUP_CTX(efer), %eax + wrmsr + + /* Restore PAT. */ + movl $MSR_PAT, %ecx + movl WAKEUP_CTX(pat), %eax + movl 4 + WAKEUP_CTX(pat), %edx + wrmsr + + /* Restore fast syscall stuff. */ + movl $MSR_STAR, %ecx + movl WAKEUP_CTX(star), %eax + movl 4 + WAKEUP_CTX(star), %edx + wrmsr + movl $MSR_LSTAR, %ecx + movl WAKEUP_CTX(lstar), %eax + movl 4 + WAKEUP_CTX(lstar), %edx + wrmsr + movl $MSR_CSTAR, %ecx + movl WAKEUP_CTX(cstar), %eax + movl 4 + WAKEUP_CTX(cstar), %edx + wrmsr + movl $MSR_SF_MASK, %ecx + movl WAKEUP_CTX(sfmask), %eax + wrmsr + + /* Restore CR0, CR2 and CR4. */ + movq WAKEUP_XPCB(CR0), %rax + movq %rax, %cr0 + movq WAKEUP_XPCB(CR2), %rax + movq %rax, %cr2 + movq WAKEUP_XPCB(CR4), %rax + movq %rax, %cr4 + + /* Restore descriptor tables. */ + lidt WAKEUP_XPCB(IDT) + lldt WAKEUP_XPCB(LDT) + movw WAKEUP_XPCB(TR), %ax + ltr %ax + + /* Restore other callee saved registers. */ + movq WAKEUP_PCB(R15), %r15 + movq WAKEUP_PCB(R14), %r14 + movq WAKEUP_PCB(R13), %r13 + movq WAKEUP_PCB(R12), %r12 + movq WAKEUP_PCB(RBP), %rbp + movq WAKEUP_PCB(RSP), %rsp + movq WAKEUP_PCB(RBX), %rbx + + /* Restore debug registers. */ + movq WAKEUP_PCB(DR0), %rax + movq %rax, %dr0 + movq WAKEUP_PCB(DR1), %rax + movq %rax, %dr1 + movq WAKEUP_PCB(DR2), %rax + movq %rax, %dr2 + movq WAKEUP_PCB(DR3), %rax + movq %rax, %dr3 + movq WAKEUP_PCB(DR6), %rax + movq %rax, %dr6 + movq WAKEUP_PCB(DR7), %rax + movq %rax, %dr7 + + /* Restore return address. */ + movq WAKEUP_PCB(RIP), %rax + movq %rax, (%rsp) + + /* Indicate the CPU is resumed. */ + xorl %eax, %eax + movl %eax, WAKEUP_CTX(cpu) + + ret +END(acpi_restorecpu) + +ENTRY(acpi_savecpu) + /* Fetch XPCB and save CPU context. */ + movq %rdi, %r10 + call savectx2 + movq %r10, %r11 + + /* Patch caller's return address and stack pointer. */ + movq (%rsp), %rax + movq %rax, WAKEUP_PCB(RIP) + movq %rsp, %rax + movq %rax, WAKEUP_PCB(RSP) + + movl $1, %eax + ret +END(acpi_savecpu) |
