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| author | Konstantin Belousov <kib@FreeBSD.org> | 2009-04-01 13:09:26 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2009-04-01 13:09:26 +0000 |
| commit | 2c66cccab7ceceb3eed086da3b2dedfc77ce72de (patch) | |
| tree | b58cda2045e48f43c2d8ff644f3d5c3a859f6e99 /sys/amd64/acpica | |
| parent | c11d6143cac353dc4d057d915cb63bf318c0f9e5 (diff) | |
| download | src-2c66cccab7ceceb3eed086da3b2dedfc77ce72de.tar.gz src-2c66cccab7ceceb3eed086da3b2dedfc77ce72de.zip | |
Save and restore segment registers on amd64 when entering and leaving
the kernel on amd64. Fill and read segment registers for mcontext and
signals. Handle traps caused by restoration of the
invalidated selectors.
Implement user-mode creation and manipulation of the process-specific
LDT descriptors for amd64, see sysarch(2).
Implement support for TSS i/o port access permission bitmap for amd64.
Context-switch LDT and TSS. Do not save and restore segment registers on
the context switch, that is handled by kernel enter/leave trampolines
now. Remove segment restore code from the signal trampolines for
freebsd/amd64, freebsd/ia32 and linux/i386 for the same reason.
Implement amd64-specific compat shims for sysarch.
Linuxolator (temporary ?) switched to use gsbase for thread_area pointer.
TODO:
Currently, gdb is not adapted to show segment registers from struct reg.
Also, no machine-depended ptrace command is added to set segment
registers for debugged process.
In collaboration with: pho
Discussed with: peter
Reviewed by: jhb
Linuxolator tested by: dchagin
Notes
Notes:
svn path=/head/; revision=190620
Diffstat (limited to 'sys/amd64/acpica')
| -rw-r--r-- | sys/amd64/acpica/acpi_switch.S | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/sys/amd64/acpica/acpi_switch.S b/sys/amd64/acpica/acpi_switch.S index d4f732a6eb2b..0b262925d2f6 100644 --- a/sys/amd64/acpica/acpi_switch.S +++ b/sys/amd64/acpica/acpi_switch.S @@ -64,12 +64,17 @@ ENTRY(acpi_restorecpu) /* 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 + /* Force kernel segment registers. */ + movl $KDSEL, %eax + movw %ax, %ds + movl $KDSEL, %eax + movw %ax, %es + movl $KDSEL, %eax + movw %ax, %ss + movl $KUF32SEL, %eax + movw %ax, %fs + movl $KUG32SEL, %eax + movw %ax, %gs movl $MSR_FSBASE, %ecx movl WAKEUP_PCB(FSBASE), %eax |