Peter Wemm bf1e897425 Give a %fs and %gs to userland. Use swapgs to obtain the kernel %GS.base ... value on entry and exit. This isn't as easy as it sounds because when we recursively trap or interrupt, we have to avoid duplicating the swapgs instruction or we end up back with the userland %gs. I implemented this by testing TF_CS to see if we're coming from supervisor mode already, and check for returning to supervisor. To avoid a race with interrupts in the brief period after beginning executing the handler and before the swapgs, convert all trap gates to interrupt gates, and reenable interrupts immediately after the swapgs. I am not happy with this. There are other possible ways to do this that should be investigated. (eg: storing the GS.base MSR value in the trapframe) Add some sysarch functions to let the userland code get to this. Approved by: re (blanket amd64/*)		2003-05-12 02:37:29 +00:00
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pc
_inttypes.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
_limits.h	Style fixes.	2003-05-04 22:13:04 +00:00
_stdint.h
_types.h	Provide a fake varargs implementation for lint's benefit. This way	2003-05-10 00:55:15 +00:00
acpica_machdep.h
apicreg.h
asm.h	Remove _ARCH_INDIRECT ifdefs. They existed for lib/msun/* on i386, which	2003-05-10 00:53:34 +00:00
asmacros.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
atomic.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
bus_amd64.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
bus_at386.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
bus_dma.h	Change the operation parameter of bus_dmamap_sync() from an	2003-04-10 23:03:33 +00:00
bus_memio.h
bus_pio.h
bus.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
clock.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
cpu.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
cpufunc.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
cputypes.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
critical.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
db_machdep.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
elf.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
endian.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
exec.h
float.h
floatingpoint.h
fpu.h	Include the MXCSR initial values, based on the AMD docs. This file	2003-05-09 18:28:05 +00:00
frame.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
ieeefp.h
in_cksum.h
kse.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
legacyvar.h
limits.h	Deprecate machine/limits.h in favor of new sys/limits.h.	2003-04-29 13:36:06 +00:00
md_var.h	Make atdevbase long for the KERNBASE > 4GB case	2003-05-11 22:53:43 +00:00
metadata.h	Slight reorg and added AMD64 support. A couple of the MODINFOMD_* values	2003-05-01 03:31:18 +00:00
mptable.h	Commit a partial lazy thread switch mechanism for i386. it isn't as lazy	2003-04-02 23:53:30 +00:00
mutex.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
npx.h	Include the MXCSR initial values, based on the AMD docs. This file	2003-05-09 18:28:05 +00:00
param.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
pcb_ext.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
pcb.h	Give a %fs and %gs to userland. Use swapgs to obtain the kernel %GS.base	2003-05-12 02:37:29 +00:00
pci_cfgreg.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
pcpu.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
pmap.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
proc.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
profile.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
psl.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
ptrace.h
reg.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
reloc.h
resource.h
runq.h
segments.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
setjmp.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
sigframe.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
signal.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
smp.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
specialreg.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
stdarg.h	Provide a fake varargs implementation for lint's benefit. This way	2003-05-10 00:55:15 +00:00
sysarch.h	Give a %fs and %gs to userland. Use swapgs to obtain the kernel %GS.base	2003-05-12 02:37:29 +00:00
trap.h
tss.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
ucontext.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00
varargs.h
vmparam.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00