8c6f8f3d5b
64bit and 32bit ABIs. As a side-effect, it enables AVX on capable
CPUs.
In particular:
- Query the CPU support for XSAVE, list of the supported extensions
and the required size of FPU save area. The hw.use_xsave tunable is
provided for disabling XSAVE, and hw.xsave_mask may be used to
select the enabled extensions.
- Remove the FPU save area from PCB and dynamically allocate the
(run-time sized) user save area on the top of the kernel stack,
right above the PCB. Reorganize the thread0 PCB initialization to
postpone it after BSP is queried for save area size.
- The dumppcb, stoppcbs and susppcbs now do not carry the FPU state as
well. FPU state is only useful for suspend, where it is saved in
dynamically allocated suspfpusave area.
- Use XSAVE and XRSTOR to save/restore FPU state, if supported and
enabled.
- Define new mcontext_t flag _MC_HASFPXSTATE, indicating that
mcontext_t has a valid pointer to out-of-struct extended FPU
state. Signal handlers are supplied with stack-allocated fpu
state. The sigreturn(2) and setcontext(2) syscall honour the flag,
allowing the signal handlers to inspect and manipilate extended
state in the interrupted context.
- The getcontext(2) never returns extended state, since there is no
place in the fixed-sized mcontext_t to place variable-sized save
area. And, since mcontext_t is embedded into ucontext_t, makes it
impossible to fix in a reasonable way. Instead of extending
getcontext(2) syscall, provide a sysarch(2) facility to query
extended FPU state.
- Add ptrace(2) support for getting and setting extended state; while
there, implement missed PT_I386_{GET,SET}XMMREGS for 32bit binaries.
- Change fpu_kern KPI to not expose struct fpu_kern_ctx layout to
consumers, making it opaque. Internally, struct fpu_kern_ctx now
contains a space for the extended state. Convert in-kernel consumers
of fpu_kern KPI both on i386 and amd64.
First version of the support for AVX was submitted by Tim Bird
<tim.bird am sony com> on behalf of Sony. This version was written
from scratch.
Tested by: pho (previous version), Yamagi Burmeister <lists yamagi org>
MFC after: 1 month
175 lines
4.2 KiB
ArmAsm
175 lines
4.2 KiB
ArmAsm
/*-
|
|
* Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org>
|
|
* Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
|
|
* Copyright (c) 2008-2010 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_CTX(member) wakeup_ ## member - wakeup_ctx(%rsi)
|
|
|
|
ENTRY(acpi_restorecpu)
|
|
/* Switch to KPML4phys. */
|
|
movq %rdi, %cr3
|
|
|
|
/* Restore GDT. */
|
|
lgdt WAKEUP_CTX(gdt)
|
|
jmp 1f
|
|
1:
|
|
|
|
/* Fetch PCB. */
|
|
movq WAKEUP_CTX(pcb), %rdi
|
|
|
|
/* Force kernel segment registers. */
|
|
movl $KDSEL, %eax
|
|
movw %ax, %ds
|
|
movw %ax, %es
|
|
movw %ax, %ss
|
|
movl $KUF32SEL, %eax
|
|
movw %ax, %fs
|
|
movl $KUG32SEL, %eax
|
|
movw %ax, %gs
|
|
|
|
movl $MSR_FSBASE, %ecx
|
|
movl PCB_FSBASE(%rdi), %eax
|
|
movl 4 + PCB_FSBASE(%rdi), %edx
|
|
wrmsr
|
|
movl $MSR_GSBASE, %ecx
|
|
movl PCB_GSBASE(%rdi), %eax
|
|
movl 4 + PCB_GSBASE(%rdi), %edx
|
|
wrmsr
|
|
movl $MSR_KGSBASE, %ecx
|
|
movl PCB_KGSBASE(%rdi), %eax
|
|
movl 4 + PCB_KGSBASE(%rdi), %edx
|
|
wrmsr
|
|
|
|
/* Restore EFER. */
|
|
movl $MSR_EFER, %ecx
|
|
movl WAKEUP_CTX(efer), %eax
|
|
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 except for FPU mode. */
|
|
movq PCB_CR0(%rdi), %rax
|
|
movq %rax, %rcx
|
|
andq $~(CR0_EM | CR0_TS), %rax
|
|
movq %rax, %cr0
|
|
|
|
/* Restore CR2 and CR4. */
|
|
movq PCB_CR2(%rdi), %rax
|
|
movq %rax, %cr2
|
|
movq PCB_CR4(%rdi), %rax
|
|
movq %rax, %cr4
|
|
|
|
/* Restore descriptor tables. */
|
|
lidt PCB_IDT(%rdi)
|
|
lldt PCB_LDT(%rdi)
|
|
|
|
#define SDT_SYSTSS 9
|
|
#define SDT_SYSBSY 11
|
|
|
|
/* Clear "task busy" bit and reload TR. */
|
|
movq PCPU(TSS), %rax
|
|
andb $(~SDT_SYSBSY | SDT_SYSTSS), 5(%rax)
|
|
movw PCB_TR(%rdi), %ax
|
|
ltr %ax
|
|
|
|
#undef SDT_SYSTSS
|
|
#undef SDT_SYSBSY
|
|
|
|
/* Restore other callee saved registers. */
|
|
movq PCB_R15(%rdi), %r15
|
|
movq PCB_R14(%rdi), %r14
|
|
movq PCB_R13(%rdi), %r13
|
|
movq PCB_R12(%rdi), %r12
|
|
movq PCB_RBP(%rdi), %rbp
|
|
movq PCB_RSP(%rdi), %rsp
|
|
movq PCB_RBX(%rdi), %rbx
|
|
|
|
/* Restore debug registers. */
|
|
movq PCB_DR0(%rdi), %rax
|
|
movq %rax, %dr0
|
|
movq PCB_DR1(%rdi), %rax
|
|
movq %rax, %dr1
|
|
movq PCB_DR2(%rdi), %rax
|
|
movq %rax, %dr2
|
|
movq PCB_DR3(%rdi), %rax
|
|
movq %rax, %dr3
|
|
movq PCB_DR6(%rdi), %rax
|
|
movq %rax, %dr6
|
|
movq PCB_DR7(%rdi), %rax
|
|
movq %rax, %dr7
|
|
|
|
/* Restore FPU state. */
|
|
fninit
|
|
movq WAKEUP_CTX(fpusave),%rdi
|
|
cmpl $0,use_xsave
|
|
jne 1f
|
|
fxrstor (%rdi)
|
|
jmp 2f
|
|
1: movl xsave_mask,%eax
|
|
movl xsave_mask+4,%edx
|
|
/* xrstor (%rdi) */
|
|
.byte 0x0f,0xae,0x2f
|
|
2:
|
|
|
|
/* Reload CR0. */
|
|
movq %rcx, %cr0
|
|
|
|
movq WAKEUP_CTX(pcb),%rdi
|
|
|
|
/* Restore return address. */
|
|
movq PCB_RIP(%rdi), %rax
|
|
movq %rax, (%rsp)
|
|
|
|
/* Indicate the CPU is resumed. */
|
|
xorl %eax, %eax
|
|
movl %eax, WAKEUP_CTX(cpu)
|
|
|
|
ret
|
|
END(acpi_restorecpu)
|