freebsd-dev/sys/x86
John Baldwin 824fc46089 MFamd64: Add support for extended FPU states on i386. This includes
support for AVX on i386.
- Similar to amd64, move the FPU save area out of the PCB and instead
  store saved FPU state in a variable-sized buffer after the PCB on the
  stack.
- To support the variable PCB location, alter the locore code to only use
  the bottom-most page of proc0stack for init386().  init386() returns
  the correct stack pointer to locore which adjusts the stack for thread0
  before calling mi_startup().
- Don't bother setting cr3 in thread0's pcb in locore before calling
  init386().  It wasn't used (init386() overwrote it at the end) and
  it doesn't work with the variable-sized FPU save area.
- Remove the new-bus attachment from npx.  This was only ever useful for
  external co-processors using IRQ13, but those have not been supported
  for several years.  npxinit() is now called much earlier during boot
  (init386()) similar to amd64.
- Implement PT_{GET,SET}XSTATE and I386_GET_XFPUSTATE.
- npxsave() is now only called from context switch contexts so it can
  use XSAVEOPT.

Differential Revision:	https://reviews.freebsd.org/D1058
Reviewed by:	kib
Tested on:	FreeBSD/i386 VM under bhyve on Intel i5-2520
2014-11-02 22:58:30 +00:00
..
acpica MFamd64: Add support for extended FPU states on i386. This includes 2014-11-02 22:58:30 +00:00
bios Add missing header needed by free(9). 2012-09-30 15:42:20 +00:00
cpufreq Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
include Rework virtual machine hypervisor detection. 2014-10-28 19:17:44 +00:00
iommu Follow up to r225617. In order to maximize the re-usability of kernel code 2014-10-16 18:04:43 +00:00
isa Virtual machines can easily have more than 16 option ROMs and 2014-10-22 01:37:32 +00:00
pci Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
x86 Rework virtual machine hypervisor detection. 2014-10-28 19:17:44 +00:00
xen xen: implement the privcmd user-space device 2014-10-22 17:07:20 +00:00