a little bit of clean up, sort ski items, and some notes about libunwind

sys/arch/ia64/TODO

@@ -1,7 +1,7 @@
 $ NetBSD: TODO,v 1.1 2018/04/14 12:06:03 scole Exp $
 
 What works:
-  The ski simulator (pkgsrc/emulators/ski) works on NetBSD, can run
+  The ski simulator (pkgsrc/emulators/ski) works on NetBSD/i386, can run
   and step through in assembly.
 
   Netbooting may work on some machines, basically you need to boot
@@ -13,32 +13,29 @@ What works:
   Also, a successful report of booting off the CD is here
   http://mail-index.netbsd.org/port-ia64/2009/06/18/msg000102.html
 
-Tasks remaining, first couple seem most important:
-
-- pmap.c is getting compilation warnings (for gcc6 & gcc7) like
-  /var/tmp//cckQKcKn.s:7614: Warning: Use of 'st8' may violate RAW dependency 'RR#' (data)
-  ...
-  how to change compile flags for specific kernel file like "CFLAGS.pmap.c+= -O0" ?
+Tasks remaining:
 - context switching and forking appear unfinished,
   vm_machdep.c::cpu_lwp_fork() appears incomplete
-- pmap module, imported from freebsd but still needs more work and
-  testing
+- pmap module, imported from freebsd but still needs more work and testing
 - IA64 Stack unwind code: Support remaining unwind descriptor
   types. (See arch/ia64/unwind/TODO). ddb() traces need to print line
-  information also.  Seems like a lot of this could be re-used
-  from freebsd
+  information also.  Seems like there are a few options:
+   1) fix and finish current unwind that is minimal, incomplete, and buggy
+   2) import FreeBSD/ia64 implementation, may be derived from HP originally:
+      http://lists.llvm.org/pipermail/cfe-dev/2016-September/050649.html
+   3) import this version
+      https://www.nongnu.org/libunwind/man/libunwind-ia64(3).html
+      originally written by one of ia64 gurus but still looks maintained
+      and portable
+   4) something else
+- kernel with LOCKDEBUG option crashes in pmap startup somewhere
 - redo _regset.h in netbsd style with __greg_t __gregset_t
-- some commands in ski are not yet implemented, 2 important ones
-  are still missing, "cstack" and "pm", which view the stack and
-  source code lines respectively 
-- create a ski network driver
-- create a ski disk driver
 - implement ld.elf_so, MK_DYNAMICROOT
 - fix memory detection, on real hardware doesn't find all memory
-- implement interrupts (sacpi & pci), can be mostly from freebsd?
+- implement interrupts (sacpi & pci)
 - MKGDB for ia64
 - implement fp[gs]etsticky, [make|get|set|swap]context
-- floating point, fenv functions were imported from freebsd, but haven't been tested
+- floating point, fenv functions were imported from freebsd, but only compile tested
 - implement core_machdep.c
 - implement __cloneS ptrace.S sbrk.S shmat.S
 - implement kvm_ia64.c
@@ -48,10 +45,9 @@ Tasks remaining, first couple seem most important:
        mutex_spin_enter()/mutex_spin_exit() __HAVE_SPIN_MUTEX_STUBS
 - rwlock.h rw_enter(),rw_exit(),rw_tryenter() __HAVE_RW_STUBS, implemented already?
 - add efipart_dev to read gpt/ffs disks for bootloader
-- fix printf of lx in bootloader/libsa ?
-- sort out bootloader/loader.efi stuff, is freebsd one good enough or
-  do we want commands more like netbsd i386 bootloader? e.g., add
-  command to boot nfs from loader.efi instead of hack now
+- sort out bootloader/loader.efi stuff, make it more like netbsd and
+  less like freebsd, command to boot nfs from loader.efi instead of
+  hack that exists now
 - ia64 implement __HAVE_FAST_SOFTINTS?
 - want or need __HAVE_CPU_UAREA_ROUTINES, cpu_uarea_alloc,  cpu_uarea_free
 - fix all "[Nn]ot yet" and "XXX" functions everywhere
@@ -65,9 +61,16 @@ Tasks remaining, first couple seem most important:
 - write console and/or X framebuffer driver.  freebsd has vgapci
   device that may be portable
 - add ia32 emulation, port from freebsd
-- create install EFI/cdrom/netbsd
+- installation media for EFI/cdrom/usb
+
+ski emulator tasks:
+- some commands in ski are not yet implemented. 2 important ones
+  are still missing, "cstack" and "pm", which view the stack and
+  source code lines respectively 
+- create a ski network driver
+- create a ski disk driver
 - fix ski to run on other archs beside i386, or at least amd64
 
-Pie in the sky
+Pie in the sky:
 - Xen and itanium!
 - qemu and itanium