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
..
pc	use __packed.	2002-09-23 18:54:32 +00:00
_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	Create a new header <machine/_stdint.h> for storing MD parts of	2002-07-29 17:41:23 +00:00
_types.h	Provide a fake varargs implementation for lint's benefit. This way	2003-05-10 00:55:15 +00:00
acpica_machdep.h	Resolve conflicts arising from the ACPI CA 20020725 import.	2002-07-30 19:35:32 +00:00
apicreg.h	Expand the APIC ID mask field of the ICR register to 8 bits intead of just	2003-03-17 19:14:13 +00:00
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	Implement fpclassify():	2003-02-08 20:37:55 +00:00
floatingpoint.h	o Move the contents of <machine/floatingpoint.h> over to	2003-01-19 06:01:33 +00:00
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	o Move the contents of <machine/floatingpoint.h> over to	2003-01-19 06:01:33 +00:00
in_cksum.h	This is the first snapshot of the FreeBSD/ia64 kernel. This kernel will	2000-09-29 13:46:07 +00:00
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	Add a new legacy(4) device driver for use on machines that do not have	2002-09-23 15:50:06 +00:00
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	Move the definition of PT_[GS]ET{,DB,FP}REGS from the MD ptrace.h to the	2002-03-16 00:25:53 +00:00
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	Move the "- 1" into the RQB_FFS(mask) macro itself so that	2002-06-20 06:21:20 +00:00
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	Activate SSE/SIMD. This is the extra context switching support that	2001-07-12 06:32:51 +00:00
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	Add conditionals to allow va_list to be defined in other headers.	2002-10-06 22:02:06 +00:00
vmparam.h	Commit MD parts of a loosely functional AMD64 port. This is based on	2003-05-01 01:05:25 +00:00